A Critique of the Site StarFall.com Design and Content Research Paper

A Critique of the Site StarFall.com Design and Content - Research Paper Example Parents find Starfall useful as it prepares their children for school, and supports them even after they join the school. The content of the website focuses on that method of learning that emphasizes the relationship between letter and sound, skills for recognizing words, and strategies for reading and comprehension. It does this with the help of activities like animated stories, movies and games. The site consists of four major units.The "Get Ready to Read" section is about the alphabet and the alphabets are pronounced in a child’s voice. The "Learn to Read" section which is for early readers and for those who are just beginning to read has fifteen different modules consisting of games, stories and movies that teach the child various letter sounds and skills. The third section, "Its Fun to Read,† designed for intermediate readers consist of activities related to art and music. The last section, â€Å"I’m Reading† is for advanced readers and has online storybooks that include well-known folktales and myths. The website also has an active bulletin board that can be used for dis cussion by parents. When students complete a program they can obtain a feedback of their performance and also give a feedback. The reading level of the text and stories is according to the grade levels it was designed for. The content of Starfall.com helps the learner to go beyond basics into a higher level of thinking. It enhances a student’s curiosity Starfall.com is well designed and the animation used compliments and enhances the process of learning. Starfall.com uses a variety of media that includes texts, graphics, video and audio narration. The main aim of a web profile is that it must be most attractive, says Stephanie Ruth (2009). In Starfall.com the colorful graphics and easy-to-read text make it attractive for children. Cartoon characters are also used in interactive stories and activities. The graphics on this website are appropriate to the goals of this program.

Edukasyon Para Sa Bayan Essay Example for Free

Edukasyon Para Sa Bayan Essay It was just a normal afternoon in the gym during a pickup game. The score was tied, game point. Nate goes up for the dunk and it goes in! When he comes back down to land, something didn’t feel right. His ankle was hurting really bad and was starting to swell. He couldn’t even walk on it. Nate sprained his ankle. Most ankle sprains happen when you make a rapid shifting movement with your foot planted, such as when you play soccer or get tackled in football. Often the ankle rolls outward and the foot turns inward. This causes the ligaments on the outside of the ankle to stretch and tear. Less often, the ankle rolls inward and the foot turns outward. This damages the ligaments on the inside of the ankle. An ankle sprain can range from mild to severe, depending on how badly the ligament is damaged and how many ligaments are injured. With a mild sprain, the ankle may be tender, swollen, and stiff. But it usually feels stable, and you can walk with little pain. A more serious sprain might include bruising and tenderness around the ankle, and walking is painful. In a severe ankle sprain, the ankle is unstable and may feel wobbly. You cant walk, because the ankle gives out and may be very painful. With most sprains, you feel pain right away at the site of the tear. Often the ankle starts to swell immediately and may bruise. The ankle area is usually tender to touch, and it hurts to move it. In more severe sprains, you may hear and/or feel something tear, along with a pop or snap. You will probably have extreme pain at first and will not be able to walk or even put weight on your foot. Usually, the more pain and swelling you have, the more severe your ankle sprain is and the longer it will take to heal. Preventing this injury is not that hard. According to emedicinehealth. com wearing the proper shoes, keeping the ankles strong and flexible, consider wearing ankle tape or an ankle brace, and making sure playing field or home environment is clear of any obstacles that could lead to injury. Healthscout. com says to maintain a regular exercise program, wearing stable shoes, stretching calf muscles before and after exercise, and maintain a healthy diet to prevent injury. But sometimes all these measures do not work and you will have an ankle injury and there are risks of reinjuring. How can we minimize recurring injuries? Brandon Hemphill, James D. Whitworth, and Rita F. Smith say that using external support during physical activity significantly reduces the likelihood of spraining your ankle. A study done by University of Georgia suggests that the different ways people move their hip and knee joints may influence the risk of re-injury. If you have ankle sprains, you may have a problem with the way you move, and we think we can change movement through rehabilitation, said Cathleen Brown, lead author of the study and assistant professor in the department of kinesiology in the College of Education. Past studies on ankle sprains have shown that some people are able to return to sports or physical activities without a problem. Brown and her team, which includes associate professor Kathy J. Simpson, also in the kinesiology department, want to know why some recover completely. One theory for explaining those divergent paths is that a person comes up with good strategies to move, land, balance and not get re-injured, Brown said. Maybe the injured people dont use the same landing strategies, or their strategies arent as effective, Brown said, adding that the study was a snapshot in time, not a long-term follow-up. By the time subjects were included in the research study, they have usually already injured themselves. We dont know if they are this way because of the injury, or if they got this injury because they land this way. There are two different initial treatments for an ankle sprain. One is RICE, consisting of rest, ice, compression, and elevation. The other is PRINCE, consisting of protection, rest, ice, NSAIDs; or non-steroidal anti-inflammatory drugs, compression, and elevation. The physician may suggest to keep all or some of your weight off your ankle and will give you crutches or a walker. An ankle brace, air stirrup, hiking boots, or other form of ankle support should be worn during this time to protect the ligaments. Stretching exercises should be continued daily and especially before and after physical activities to prevent re-injury. Even after your ankle feels better, continue with muscle-strengthening exercises and balance and control exercises several times a week to keep your ankles strong. The timing and type of rehab exercises may vary according to your doctors or physical therapists preferences. Anti-inflammatory pain medications such as ibuprofen and naproxen are used to reduce the pain and combat swelling. Ankle sprains are commonly misdiagnosed. This is because the two major types of sprained ankles-high ankle sprains and lateral ankle sprains-often look the same, even though they affect entirely different ligaments. The less common type, a high ankle sprain, is often mistaken for a lateral sprain. Misdiagnosis can delay getting the right treatment-and that can impair recovery. One problem is that the symptoms of high ankle sprains parallel those of the lateral ankle sprain, which occurs in the lower ankle area, says Marque Allen, DPM, FACFAS, foot and ankle surgeon from San Antonio, Texas and a Fellow of the American College of Foot and Ankle Surgeons. Pain, swelling, limited motion, and bruising in the entire ankle region can occur in both high ankle sprains and lateral ankle sprains. The difference lies in where the injury occurs and which ligaments are involved. High ankle sprains can get complicated, because this region has five ligaments connecting two bones in the leg, compared with three ligaments that can be affected in lateral ankle sprains, says Dr. Allen. In diagnosing an ankle sprain, its important for physicians to understand how the injury occurred. Lateral sprains are caused by the foot turning inward, whereas high ankle sprains are the result of the foot being forced outward. Other complications include ankle synovitis, which is inflammation of the inner lining of the ankle joint capsule, persistent swelling of the ankle, lateral ankle instability, and nerve injuries. There are many different exercises one can do during the rehabilitation period. For example, range of motion exercises, strength exercises, and activity-specific exercises. Proprioception exercises and other balance exercises can help you recover more quickly and should actually be performed as part of a prevention program. Poor balance is a good predictor of future ankle sprains. After an ankle injury, balance training is essential to recovery. In addition to our eyes and inner ears, there are special receptors in our joints, proprioceptors, which provide information about our position in space. By balancing on one leg, you can reinforce and strengthen those receptors in the ankle. Balance on the affected leg and hold steady for 15 seconds. Continue to challenge your ankle by balancing with your eyes closed, or with your head turning from side to side. If you play soccer, balance on your sprained ankle and kick a soccer ball against a wall. If you play basketball, balance and shoot or practice bounce passes. You can get creative with your exercise to match your sport. The Ottawa ankle rules are a set of guidelines for clinicians to aid them in deciding if a patient with foot or ankle pain should be offered X-rays to diagnose a possible bone fracture. Before the introduction of the rules most patients with ankle injuries would have been X-rayed. However only about 15% of X-rays were positive for fracture, other patients had sprains or other injuries. As a result many unnecessary X-rays were taken, which was costly, time consuming and a possible health risk. The rules state that X-rays are only required if there is any pain in the malleolar zone and any one of the following: * Bone tenderness along the distal 6 cm of the posterior edge of the tibia or tip of the medial malleolus, OR * Bone tenderness along the distal 6 cm of the posterior edge of the fibula or tip of the lateral malleolus, OR * An inability to bear weight both immediately and in the emergency department for four steps. The Ottawa foot rules are for assessing whether a foot X-ray series is indicated. It states that they are indicated if there is any pain in the midfoot zone and any one of the following: * Bone tenderness at the base of the fifth metatarsal (for foot injuries), OR * Bone tenderness at the navicular bone (for foot injuries), OR * An inability to bear weight both immediately and in the emergency department for four steps. It is best to refrain from returning to full activity before complete healing of the ankle has occurred in order to avoid re-injury and possible complications. Ankle sprains take an average of 6 weeks to heal but can take can up to 4 months, depending on the severity. After returning to your sport, you have to make sure you take all precautions. Especially by making sure your ankle is supported by a brace or by tape. Some studies have shown that braces are more effective than tape, though. Either one is better than no support. In conclusion, preventing yourself from injury is a lot easier than people think. But if injury does occur, don’t assume you will be out for 4 months. People heal differently and how long healing takes depends on the severity of the injury. Works Cited American College of Foot and Ankle Surgeons: Sprained Ankles Can Be Complicated and Misdiagnosed. India Pharma News (2012). Http://galenet. galegroup. com. ezproxy. aacc. edu. 2 Mar. 2012. Web. 28 Mar. 2012. Hemphill, Brandon, James Whitworth, and Rita Smith. Q / How Can We Minimize Recurrent Ankle Sprains? Journal of Family Practice 60. 12 (2011): 759. Http://galenet. galegroup. com. ezproxy. aacc. edu. Web. 28 Mar. 2012. UGA Study Suggests Key to Avoiding Ankle Re-injury May Be in the Hips and Knees. NewsRx Health Science (2011): 321. Http://galenet. galegroup. com. ezproxy. aacc. edu. Web. 28 Mar. 2012. Ankle Sprain Causes, Symptoms, Treatments, Recovery. WebMD. WebMD, 19 May 2011. Web. 28 Mar. 2012. http://www. webmd. com/a-to-z-guides/ankle-sprain-overview. Health Encyclopedia Diseases and Conditions. Ankle Sprains. The HealthScout Network, Inc, 1 Apr. 2009. Web. 28 Mar. 2012. http://www. healthscout. com/ency/1/572/main. html. Cunha, John P. Read What Your Physician Is Reading on Medscape. EMedicineHealth. Web. 28 Mar. 2012. http://www. emedicinehealth. com/ankle_sprain/article_em. htm.

Wedding Speech for a Maid of Honor or Best Woman :: Wedding Toasts Roasts Speeches

Wedding Speech for a Maid of Honor or Best Woman For those of you who don't know me.....I'm Misty.....Martha's friend of 17 years and her maid of honor. Martha, I just want you to know how honored I am to stand by your side on this special day. And can I just say how beautiful and happy you look right now? Gosh you would think it was your wedding day or something! Martha and I met at James Rutter Middle School in the 7th grade. She was the "new student".......the "quiet" student. Or so everyone thought. Whenever we got together it was non-stop laughter, but whenever we were around other people it was a different story. I'm sure when most of you first met Martha you probably thought she didn't like you or that she had an attitude problem because of the way she looked at you when you spoke to her....you know---that "whatever" look. In school, people use to ask me if she was deaf. I would say, "No, believe me, she's hilarious!" They would look at me like, "Yeah right." It was kind of like that Warner Brothers frog that would only sing in front of his owner but around everyone else he would just sit there and ribbit. As far as I could remember, since we've been growing up, we've had lots of good times and memories together. It seems like it was just yesterday that we were spending whole weekends at each other's houses, staying up all night getting carpal tunnel trying to win concert tickets on the radio. Whenever I think back to all the good times we've had, I can always picture myself laughing so hard, holding my stomach, trying to keep the tears from falling. Actually, wasn't that just yesterday? We started out inseparable and as we grew up sadly the weekend long sleepovers became fewer and fewer but nevertheless we still call each other and see each other whenever we're able to steal a few moments between those grown up responsibilities like work and relationships. Even though we're all grown up, some things never change. We still crack each other up and still have our "secret" language that only the two of us can understand like "Woodchuck to Grey Squirrel......come in Grey Squirrel" or "nduh ". And even though I will always cherish the memories we've made and will make, it is time for us to create new ones.

Principles for implementing duty of care Essay

Explain what it means to have a duty of care in own work role. As a care assistant, I have a Duty of Care that is a legal requirement/obligation, requiring that I adhere to a good quality & standard of care when providing care & support to my service users. Every individual should be supported & enabled to live in an environment which is free from prejudice & safe from abuse. My responsibility under the duty of care is to do everything reasonable within my job role description & in conjunction with my employer’s policies & procedures to make this happen. It is part of my job role to care for individual’s, ensuring that the individual’s needs & well being are looked after. As individual’s, all service users have a right to be treated with respect, given choice, treated fairly & equally & not to be mistreated or subjected to any form of abuse. Taking on the role of a care assistant, I have agreed to provide a duty of care to the individual by following: â₠¬â€œ the codes of practice (outlined by HASWA), following company policies & procedures, undertaking the necessary training & conducting myself in a respectful, professional & competent manner. Following these guidelines empowers me with the knowledge, skills & competence to carry out my day to day tasks whilst ensuring that all who I come into contact with during my working day are protected from harm, injury or abuse: i.e. the service user, their family & friends, fellow work colleagues etc†¦ Explain how duty of care contributes to the safeguarding or protection of individuals. In my current role, I have a duty of care to ensure that all service users are safe. I have a duty to raise any & all concerns I have about any facet of my job e.g. inadequate working conditions, poor equipment, poor training, bad practice by other staff members, raising concerns about potential abuse & situations of neglect. My duty of care contributes to the safeguarding & protection of the individual, by ensuring that individuals are safe from any sort of harm such as: illness, injury or abuse. It is my responsibility to work within the codes of practice & my employer’s policies & pr ocedures. This involves the recording & documenting of all information when an accident or incident occurs & pass this  information immediately on to my superiors & other relevant persons i.e. doctors & social workers. Know how to address conflicts or dilemmas that may arise between an individual’s rights and the duty of care. Describe potential conflicts or dilemmas that may arise between the duty of care and an individual’s rights. It is my duty of care to support my service users to take their medication that has been prescribed by a doctor & to ensure that they are in good health. If a service user refuses to take their medication that is their right, however, this could be detrimental to their health. I would ask the individual as to why they did not want to take their medication, as there may be an underlying issue such as: the individual has developed a problem swallowing or is finding the tablets too large to swallow. In each case I would call a doctor & explain the sit uation. The doctor may say the individual has tonsillitis & can prescribe smaller tablets. I would then record this information & report it back to my manager. If a service user just refused to take their medication because they did not feel like taking it, i.e. because they were in a bad mood, they still have the right to do so. At this point I would try to encourage them to take the medication by explaining to them that it has been prescribed to them by a doctor for a reason, therefore you must require it. If the service user still refused, I would make a record of it, report it to my manager, leave the individual & return 30 minutes later to see if they had become more receptive to taking the medication. If the individual still refused to take their medication I would record this & call my manager as I have a duty of care to the individual to report it. Another example of a dilemma could be if a service user who is unsteady on their feet, refuses to use their walking aid. The individual i s at risk of falling causing injury to themselves or others. I have a duty of care to encourage the individual to use their walking aid by explaining the possible consequences of what could happen as a result of their actions. However, it is the individual’s right to make that choice & I cannot force or pressurise them. Describe how to manage risks associated with conflicts or dilemmas between individual’s rights & the duty of care. Managing conflicts & dilemmas of this nature, is best achieved by working with the individual to put risk assessments in place to try & make the situation as safe as possible, but still allowing the individual the freedom & right to do as they  choose. A risk assessment is not carried out to remove the risk, but rather to put in place actions that will help reduce the risk to stop the possibility becoming reality, looking at situations where there is a risk & considering what can be done to reduce it. An example of this could be an individual refuses to take their prescribed medication for whatever reason. The individual has the right to decline taking the medication, but this would then create a risk to the health & well-being of the individual. I would ask the individual as to why they did not want to take their medication, as there may be an underlying issue such as: the individual has developed a problem swallowing or is finding the tablets too large to swallow. In each case I would call a doctor & explain the situation. The doctor may say the individual has tonsillitis & can prescribe smaller tablets. I would then record this information & report it back to my manager. If however, the individual just refused to take their medication because they did not feel like taking it, i.e. because they were in a bad mood, they still have the right to do so. At this point I would try to encourage them to take the medication by explaining to them that it has been prescribed to them by a doctor for a reason, therefore you must require it. If the individual still refused, I would make a record of it, report it to my manager, leave the individual & return 30 minutes later to see if they had become more receptive to taking the medication . If the individual still refused to take their medication I would record this & call my manager as the individual has now created a risk & I have a duty of care to the individual to report it. Describe how to manage risks associated with conflicts or dilemmas between individual’s rights & the duty of care. If a situation ever arose where I required additional support in resolving conflicts/dilemmas, there are numerous sources at my disposal. I.e. Work Colleagues – who may have had to deal with a similar situation & can provide me with advice & support that I require. Policies & Procedures – my employers have strict guidelines which can be found in the policies & procedures handbook. If I am ever unsure of how to deal with conflicts/dilemmas I can refer to this handbook. Trade Union – they are experienced in dealing with conflicts/dilemmas & can easily provide information or support on dealing with various conflicts/dilemmas. Training – my job role requires regular & consistent training in all aspects of  my role, including having to deal with conflicts/dilemmas. This means I can refer to my handouts & notes given to me during my training. Management – any serious conflicts/dilemmas that I cannot resolve I can immediately contact my organiser or higher management who can then support & advise me on the correct course of action to take. Know how to respond to complaints Describe how to respond to complaints. I would respond to any complaint an individual had by firstly, sitting down with them & asking what the complaint is. If the complaint was of a minor nature & something I could resolve without support, I would ask the individual if they would like me to do so. If the complaint was of a more serious nature & of greater concern that may require further investigation, I would show the individual the complaints procedure located in their red folder which is in all the service user’s homes. I would then ask the individual if they would like me to read it to them & ask the individual if they understand. I would then show them the complaints form & ask if they need assistance to complete it. I would have to inform my manager of all the information relating to the complaint. Explain the main points of agreed procedures for handling complaints. Ensure the individual understands how to use the complaints procedure – this would involve asking the individual whether they understood how to use the complaints procedure. If their response was no I would advise & refer them to their red folder. Explain to the individual how the procedure works & when they could expect a response. This involves providing the individual with a time scale on when action will be taken e.g. an initial response to the complaint should be received within three days, then anything up to 28 days for resolution to the complaint; if the complaint is of a more serious nature a formal investigation may be required which will take from 3 – 6 months in total; there may be an informal stage where consultation with the complainant can resolve the complaint fairly quickly. Take the individuals complaint seriously, listen to their complaint, be polite & respectful. This involves; focusing on the individual (making eye contact); do not be judgmental; assure individual complaint will be reported immediately. Offer assistance if the individual requires help filling out the complaints form,  e.g. where the complaints forms can be obtained; they may not understand how the form should be filled in correctly; the individual may not be able to read or write, could be blind, or have very poor English language skills Report the complaint to my organiser. Some complaints are of a very minor nature & can be dealt with effectively there & then, but should still be logged & reported to my manager. For those complaints that are more complicated or serious, my manager or next available senior needs to be made aware of the complaint as soon as possible so that the necessary steps can be taken quickly & efficiently, satisfying the needs & expectations of the complainant. Unit 2 – SHC33 SHC33.1.1 – Explain what is meant by Diversity. Diversity means mixture, variety, difference, be it in whatever way, shape or form. The concept of diversity encompasses acceptance & respect. It means understanding that each individual is unique & recognising our individual differences. These differences can range from, race, ethnicity, gender, sexual orientation, socio-economic status, age, physical ability, religious belief, political belief & many more. Diversity is positive & should be respected, valued & nurtured, because nobody is completely the same as anyone else. Telling them that being different from everybody else makes us all unique & that we must value this diversity & difference that surrounds us, in order to work together to make our society a positive place to live. SHC33.1.1 – Explain what is meant by Equality. Equality means everybody receiving the same privileges, opportunities & respect as everybody else regardless of their shape, colour or beliefs. Equality states that because we are all human, then we must all be equal. Equality is about fostering & promoting the right to be different, to be free from discrimination & to have choice & dignity & the right to be valued as an individual. SHC33.1.1 – Explain what is meant by Inclusion. The term inclusion is seen as a universal human right & aims at embracing  all people, irrespective of race, gender, age, disability, medical or any other need. It is about providing everyone with equal opportunities, choice & access & getting rid of discrimination & intolerance. SHC33.1.2 – Describe the potential effects of discrimination. A prejudice is an attitude or way of thinking based on an unfounded, unreasonable pre-judgement of an individual, particular group of people or situation, rather than on a factual assessment. Prejudices can be positive or negative. If we are positively prejudiced towards someone, we think well of them. On the other hand, if we are negatively prejudiced against someone, we tolerate them less. In the main, negative prejudices develop against people who are different in some way. Discrimination happens when we act out our negative prejudices. Discriminatory behaviour results in unfair, unjust treatment. The people most likely to be discriminated against are those who are different in respect of their: _ Age. Age discrimination, or ageism, isn’t only targeted at elderly people – youngsters can also be on the receiving end of bullying, harassment and undeserved criticism. Sex. Men and women continue to be treated unfairly in certain walks of life, in particular in the workplace. Discrimination based on sex is known as sexism. _ Nationality, ethnic background, religion. Some people consider themselves superior to those from different backgrounds and faiths. Victimisation, bullying and harassment of people for such reasons is known as racism. Ability. Barriers that prevent disabled people from accessing the same opportunities as able-bodied people and the ignorant acting out of negative prejudices against physically or intellectually disabled people , for example through name-calling and damage of their property, is known as disablism. Size. Some of us are guilty of judging people by their size and treating them unfairly as a result. This behaviour is known as sizeism. Financial status. Discrimination against people on the grounds of their income, for example treating people living in poverty as inferior, is known as povertyism. There are two forms of discrimination, direct and indirect. Direct discrimination occurs when someone is intentionally treated unfairly, for example harassment on the basis of skin colour or religion. Indirect discrimination occurs when rules or guidelines meant to apply to everyone unintentionally affect one group of people more than others. For example, a company policy requiring everyone to work night shifts indirectly  discriminates against single parents or people who care for elderly relatives, and menus that fail to offer a selection of food indirectly discriminates against people with specific dietary needs or preferences. SHC33.1.3 – Explain how inclusive practice promotes equality & supports diversity.Inclusive practice is about the attitudes, approaches and strategies taken to ensure that people are not excluded or isolated. It means supporting diversity by accepting and welcoming people’s differences, and promoting equality by ensuring equal opportunities for all. Inclusive practice is best practise. Health and social care workers demonstrate inclusive practice by working in ways that recognise, respect, value and make the most of all aspects of diversity. Having a sound awareness of and responding sensitively to an individual’s diverse needs supports them in developing a sense of belonging, wellbeing and confidence in their identity and abilities. And it helps them to achieve their potential and take their rightful place in society. In addition, inclusive practice involves having an understanding of the disastrous impact that discrimination, inequality and social exclusion can have on an individual’s physical and mental health. Having such an understanding ensures appropriate, personalised care and support, thereby enabling an individual to develop self respect and maintain a valued role in society. Because people who fail to support diversity or promote equality are usually entirely unaware of their attitudes and the impact of their behaviour, inclusive practice involves reflecting on and challenging ones own prejudices, behaviours and work practices. It also involves challenging those of colleagues and other service providers, with a view to adapting ways of thinking and working and to changing services to build on good practice and to better support diversity and promote equality. Discrimination is an injustice and has devastating effects. The UK has in place numerous pieces of legislation (laws), rules, regulations, guidance documents and statutory codes of practice, all of which are intended to promote diversity, ensure equality and end discrimination. In other words they are in place to promote everyo ne’s right to fair and equal treatment, regardless of their differences. SHC33.2.1 – Explain how legislation & codes of practice relating to equality, diversity & discrimination apply to own work role.In England and Wales, the General Social Care Council (GSCC) is responsible for ensuring that standards within the social care  sector are of the highest quality. It has developed Codes of Practice for all care workers that include information on how to protect and promote the rights of individuals using the service. The Codes of Practice provide a guide to best practice and set out the standards of conduct that workers are expected to meet. The General Social Care Council (GSCC) Codes of Practice for Social Care Workers and Employers directs social care workers to treat each person as an individual; respect and, where appropriate, promote their individual views and wishes; and support their right to control their lives and make informed choices. Whilst a health or care worker might not agree with the beliefs and values of the people they work with, nor share their preferences, inclusive work practice involves respecting and promoting: The right to freedom of thought and religion i.e. their beliefs The right to freedom to express their beliefs as they wish The right to freedom of conscience i.e. to personal values and a sense of right and wrong Respecting, promoting and responding to personal preferences. SHC33.3.3 – Describe how to challenge discrimination in a way that promotes change. Talking to people about discrimination does not ensure that they will change their mindset and, as a consequence, their behaviour. Similarly, the existence of legislation, policies and procedures and Codes of Practice does not guarantee that people using services receive fair treatment and that their rights are upheld. If attitudes and behaviours are to change, discrimination needs to be challenged effectively. Another tried and tested method of challenging workplace discrimination and making change happen is by analysing the reasons why a worker behaves in a discriminatory way. Informal discussions, during a coffee break or as part of a training session, provide useful opportunities to reflect on the dire effects of discrimination. Most people using health and care services are liable to have experienced discrimination at some time or another. Indeed, their experience of discrimination may be the reason they are in need of care now. Talking through these issues, especially with people who have been victims of discrimination, and imagining how it must feel to experience unfair, unjust treatment, can have powerful effects on thinking and behaviour. There is no definite way to challenge inappropriate behaviour and no doubt you  will find your own approach to challenging effectively. The following may be useful to consider. Don’t punish or blame – say what is better. Understand your audience. Think about your role in the situation and consider this in your approach. State your position: ‘That’s disrespectful; we don’t talk about people/children like that.’ Understand the situation. Do you challenge there and then, or quietly at a later date? What will bemost effective for the person involved/for those witnessing the incident?

Aquinas on Conscience Essay

For Aquinas. scruples is the act of using our cognition of good and evil to what we do ( or might make ) . So in order to ( of course ) know what is a good action or bad one. one needs to understand how things are of course ordered by God — chiefly what human nature is and what things it needs and deserves. This order which dictates what is good or evil behavior is called the Natural Law by Aquinas. God can and does besides preternaturally uncover what is and is non in conformity with his will. e. g. the Ten Commandments and Christ’s Two Great Commandments. One besides needs to use this cognition to what one does. and so one needs to be free to move in conformity with what one knows to be the Divine order of things. or non. Our scruples is our realisation that what we might make or hold done is good or non. but it is non the existent making or the choosing. On a proficient note. for Aquinas scruples is the act of understanding what is right and incorrect. though the name may be applied by extension to a wont or power of executing this act of understanding. The virtuousness of doing right judgements about right or incorrect. i. e. appropriate exercisings of scruples is called prudence. The ground that this is of import is that one can non make the right thing if one does non cognize what the right thing is. So. if person has jobs with their scruples. it does non look appropriate to fault them. Children do non hold to the full formed scrupless. and do non ever understand what the right thing to make is. If a kid does incorrect because he or she didn’t know any better. or because he or she thought it was the right thing to make. we do non ( or should non ) incrimination and penalize him or her. Aquinas hence believes that non merely is one excused from wrongdoing if one’s scruples is in mistake. one besides is bound to make the incorrect thing if one’s scruples tells one that it is the Right thing to make. He besides believes that one has a responsibility to hold a grammatical scruples. one that knows what the right thing to make is. Even though an earring witting alibis one from making incorrect. one may hold done incorrect in allowing one’s scruples autumn into mistake.

Ask Professors for Writing Help

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Glossary of Historical Terms

Glossary of Historical Terms All eras of history have their own terms and words unique to them; if you’re lucky, they’ll even be in a language you speak. But the act of studying history has a range of terms too, and this page will explain the historiographical terms used both throughout the site, and the books students commonly need. Read these  tips for writing a history paper. History Terms From A to Z Archive: A collection of documents and records. Archives can be huge and take years to adequately master (or, in the case of some museums, even longer), and they can just be small but deliberate groupings of material. They are the homes of the previous generation of historians but are increasingly going online. ​Autobiography: An individuals account of their life. The auto part means that individual has had major input, if not writing it themselves, but this doesn’t mean the work will be historically accurate. The historian will have to judge that, but it does mean it’s the past as the individual wishes it to be remembered.Bibliography: A list of works, including books, journals, and essays, on a particular subject. Most serious historical works have a bibliography of what was used to create it, and most students and readers are encouraged to use it as a basis for exploration.Biography: An account of an individuals life, written by another person. This might be a historian, it might be a hack selling tawdry rumors and needs to be assessed just as carefully as an autobiography. Book Review: A critical examination of a text, usually including a summary of the work and opposing views. Journalistic book reviews will tend to focus on whether the book is good, academic book reviews will tend to place the book in the context of the field (and whether it’s good.)Context: The background and specific circumstances of a subject, such as an authors lifestyle, or the weather during a car crash. Context is absolutely everything when it comes to analyzing  a document, or setting the scene for your essay.Discipline: The study, or practice, of a subject using a specific set of methods, terms, and approaches. History is a discipline, as is Archaeology, Chemistry or Biology.Encyclopedia: A written reference work, composed of informative articles arranged alphabetically. These can either focus on a particular subject or, in the case of the Encyclopaedia Britannica, on everything. The more an encyclopedia covers, the less depth it tends to have, so volumes specific to your target subject are the goal. History: Either the study of the past or the product of our attempts to understand the past. See ‘the Past’ below for the full explanation.Historian: An individual who studies the past.Historiography: Either the methods and principles used in the study of history or the written result.Interdisciplinary: The study, or practice, of a subject which applies the methods and approaches of several disciplines. For instance, while History, Literature, and Archaeology are separate disciplines, they can be combined.Journal: A periodical which normally deals with a specific issue, for instance, National Geographic. By periodical, we mean a sort of magazine.Past, The: Events which happened previously in time. It might sound strange to have ‘history’ and ‘the past’ meaning different things, but the distinction is important when you remember that all our attempts to narrate and explain earlier events are affected by our own biases and difficulties of time and transmission. What historians have done is used ‘The Past’ as a base point: this is what happened, this is what most people think of as history. Historians then consider ‘history’ as the product of our attempts to recreate the past. Primary Sources: Material from, or directly related to, the past. In History, primary sources are usually letters, records or other documents created during the period that is being studied, such as diaries, legal notices or accounts. However, primary sources can include photographs, jewelry, and other items.Reference Work: A text, usually in the form of a dictionary or encyclopedia which contains facts and information, but not normally discussions.Secondary Sources: Material created by somebody removed from the event being studied - who was either not at the event, or was working later. For instance, all history textbooks are secondary sources.

10 Phrases Youre Probably Saying Wrong

10 Phrases Youre Probably Saying Wrong 1. Prostrate CancerThis one goes hand in hand (er†¦ well†¦ goes along with) â€Å"anticdote.† Prostate cancer is experienced by thousands of individuals annually. Prostrate (note the â€Å"r†) has to do with being flat on the ground.   2. First-Come, First-ServeI know, I know, you’re probably well aware that it’s actually first served and it’s just verbal shorthand. But†¦ prove to everyone else that you know it, and you just might help them realize they don’t want to be asking the first people there to serve everyone else.  3. Sneak PeakFun with homophones! Peak, Peek, and Pique are three different words. A peak is the top of a mountain. A peek is a quick look (what you’re sneaking). And pique is what you storm away in a fit of, or perhaps something â€Å"piqued your interest.†Ã‚  4. Deep-SeededThis one sounds like it could be correct! Something planted very deeply as a seed would have roots and be hard to era dicate! But when it comes to language, logic is sometimes the great betrayer. What you’re actually thinking of is â€Å"Deep seated†, and it means firmly established.  5. Extract RevengeIf revenge were a potion and someone had stolen yours and you needed to retrieve it by squeezing, what you’d doing is exacting revenge.  6. Shoe-inThis is the location of your Birkenstocks, right? Because â€Å"shoo-in† is a guarantee.  7. Emigrated toIn this current state of difficulty for immigrants and emigrants alike, the least we can all do- I mean the absolute bare minimum- is to learn that you immigrate to a place, and emigrate from a place. Let the origin or the destination guide whether you emphasize it.  8. Baited BreathThink of it this way- what do fisherpeople use for bait? It all smells gross, right? You wouldn’t want that on your breath. But you might hold it for a minute if the bait got near you- in other words it would have abated. Thusly, ba ted breath is breath that is held in anticipation.  9. 10 Items or LessThis one drives me batty in checkout lines all over the country. Less is for liquids. If you can measure it by moving your thumb and forefinger closer or apart, it’s less. If it’s anything you can count (like the items in your grocery cart), for â€Å"not as many,† it’s fewer.  10. Over 50 billion servedThough we could parse who they’ve served and how well they’ve done it, what McDs means is more than. Think of the cow jumping over (i.e. above) the moon. She probably saw more than 50 billion stars up there!

Renewable Energy and Combustion Process Assignment - 5

Renewable Energy and Combustion Process - Assignment Example Question 4, b: The age of the shoe is about 112 years. Question 4, c. the huge disparity in the quantity of carbon in both the shoe and the shoelace validates the claim that the lace does not belong to the shoe. Question 5: taking a tour of Okuma city is a safer choice owing to the fact that she will wear protective gear unlike in the dinner date where she is likely to eat fish exposed to the active radioactive substance. Question 6, a: The energy released every second is 2.55Ãâ€" 10−13 Joules. Question 6, b: the amount of energy released in the context is higher than the energy consumed by a 100W bulb. Question 6, c: Shutting down the reactor stops the reaction but the core would still emit energy amounting to 1.55Ãâ€" 10−13 Joules owing to the constant rate of reaction daily. Question 7, a: The capacity of the dam is likely to increase with the increase in the amount of water in its reserve. Question 7, b: Renewable energy is often unreliable owing to climatic disparities. Question 8: Furthermore, the two types of fuels just as any other renewable energy does not pollute the environment since they emit unstable yet harmless gaseous components that readily react with the oxygen in the atmosphere to form water vapor. Question 8: Biodiesels and is renewable because just as the name suggests the key raw material in its manufacture are plants, which grow just like any other. The same is the case with ethanol whose manufacture relies on plants that act as the raw materials.  

Batek of Malaysia Research Paper Example | Topics and Well Written Essays - 1500 words

Batek of Malaysia - Research Paper Example Each of the groups has their own way of living, their own culture to follow, their own language and even unique modes of sustenance. But, as the urban development spreads its roots, the advancements in technologies and science have pushed the boundaries of these unique life styles and have merged most of the culture together, desperately done by the original people in order to sustain these tremors of modern life. Yet, the Bateks are still an exception to all these changing scenarios. They have gripped onto their culture and tradition and have sustained their living through their own traditional ways. The thesis, thus taken up here focuses on exploring the culture of Batek, identifying the unique characteristics of this tribal group of people and to divulge more about their way of living and sustenance. A background According to census taken in the year 1995, there are approximately 700 to 800 people of Batek, who are currently living. With the emergence of urbanization, the numbers may have been reduced more. During the years of 1970, the Bateks lived in the Malaysian states called as Kelantan and Pahang. Their physical appearance is similar to those tribes of Africa and hence former European researchers came to a conclusion that they are remnants of those African tribes. Their tribe name came from the Austronesian speakers who settled in those regions. Their basic language for communication is the Mon-Khmer language. Primary mode of sustenance The Bateks have their connections with the Hoabinhians, from 8000 BC. The Hoabinhians are basically foragers and hence foraging as a means of existence became one of the primary mode of subsistence for the Bateks. As years progressed, horticulture came into picture during 2000 BC. Later, the Batek started to trade with outsiders and it remained as one of important business aspect of the Bateks during the period between 6th and 13th centuries. Slavery crept into the tribe when Malays started invading the Bateks. With the government intervening, the Bateks were freed from slavery in 1920 and came under the direct supervision of them in 1954. (Endicott 1978) With the population dwindling and with the urban growth expediting at a rapid pace, the Bateks settled in the valleys and at the groundside of hills because, higher the altitude, difficult it becomes to forage. Irrespective of the fact that the Bateks have explored several numbers of options to gather food, foraging remains to be their primary and best option. The reason for such a trend is due to two reasons. Firstly, the advantages of foraging allowed them to gain access to food wherever they went as there was no permanent place of living for the Bateks. The second reason, actually being the source of the first reason, is that, foraging allowed them to maintain their life as well as integrity even in the most precarious situations they had faced during the time of immigration of the Malay people - when they started restricting the boundaries of the Bateks. Slavery and intrusion endangered the lives of the Bateks and always kept them on the move, thus denying them of harboring any notions of existence except foraging. (Endicott 1978) Impact on Social and Political Organization Although life among the Bateks is a closely knit one, individual, nuclear families form the basic building blocks of the entire

Research English Essay Example | Topics and Well Written Essays - 1500 words

Research English - Essay Example According to Horvat et al (2003 p319) â€Å"...social classification involves the grouping of people in society on the basis of the collective features of individuals...† This implies that social classification involves the grouping of individuals in society based on common social features. Based on these characteristics, social scientists and other interest groups in the society can identify similar characteristics and make generalizations which can help in the improvement of lives in the society. There are many possible ways of classifying people in the society. Historically, the most popular basis for the classification of people in the American society has been race (Thompson & Hickey, 2005). In other words, people were grouped into various categories based on their skin color and race-related features like facial features, hair types amongst others. For generations, this remained convenient because the skin/racial features offered the most conspicuous method of identifyin g individuals uniquely. However, in the 21st Century, the classification of people into groups based on their racial features has been found to be unconstitutional, unfair, illegal and unacceptable. Due to this development, people are classified into groups in ways that are legally acceptable. This enables interest groups to study and get a good understanding of general trends in the American society and provide better ways of improving the livelihoods of individuals through collective methods. There are numerous ways that individuals are classified in America. The different methods of classification of social groups is based on a number of criterion. Schooler & Schoenbach (1994) identify that the most popular basis for the classification of individuals into groups in America are jobs, income, education, wealth and social networks. People can be classified on the basis of the rank they occupy in the workplace. This is based on the logic that individuals with the same rank have certa in unique behaviors, trends, habits, attitudes to job security and preferences. Thus operatives in businesses in America and management can be grouped in separate categories since their behavior and tastes are likely to be fashioned along similar lines since they are affected by the same circumstances most of the time. People can also be categorized on the basis of the level of income they make. This is because income is likely to affect the spending habits and preferences of individuals and the collective picture can give room for some generalizations. For instance people earning just enough to pay for basic necessities are likely to behave in a way that is different from people who earn enough to cover their basic needs, security needs and also get some excess to save and invest. In practical terms, whilst the first group will focus on survival matters, the second group might be considering better ways of spending their money and more fruitful investment activities that will bring them more returns. This shows that there is a clear distinction between the two groups. The educational and wealth level of each group of people also determines their social classification. This is because education often affects the mental scope of individuals and also affects the earning power of individuals. Thus people can be grouped on the bases of their education and wealth. Also, the social network a person belongs to is important

Mitochondrial Disease, Parkinsons Research Paper

Mitochondrial Disease, Parkinsons - Research Paper Example [Betelham et al 2007] Mitochondria are large organelles about 1 to 2 micrometer in diameter, upto 2000 of which are present in eukaryotic cells and constitute upto 25% of the cellular volume. The outer membrane enclosing the mitochondria is smooth, while the inner membrane is thrown into a series of folds known as the cristae. The space between the two membranes is called the intermembrane space. Both the structure and the quantity of mitochondria in different tissues can differ greatly depending upon the metabolic needs of the tissue. [Koolman et al 2005] Mitochondria play several vital roles in the normal functioning of the cell. Their most important role is in the production of ATP by oxidative phosphorylation. They also serve as reservoirs of calcium within the cells and play a vital role in inducing apoptosis. . [Koolman et al 2005] The vast range of mitochondrial functions are associated with a range of mitochondrial enzymes. "Pyruvate dehydrogenase, the TCA cycle, beta hydroxylation of fatty acids and parts of the urea cycle are located in the matrix. The respiratory chain, ATP synthesis and parts of the heme synthesis pathway are associated with the inner membrane." [Koolman et al 2005, pg 210] One of the unique features of the mitochondria is that they are a self replicating organelle and can replicate independent of the parent cell. The mitochondrial genome is composed of 37 genes. Of these, "24 specify a mature RNA product, 22 molecular tRNA molecules and 2 molecular rRNA molecules. the remaining 13 genes encode polypeptides that are synthesized on the mitochondrial ribosomes [Strachan and Read 2004, pg 243]. Unlike nuclear DNA, mitochondrial DNA is very compact, lacking exons. For this reason any coding error in the mitochondrial DNA is far more likely to be transmitted to successive generations of the cell. However, because of the large number of mitochondria, the overall effect of such a mutation remains small unless transmitted in a gamete to the next generation. Mitochondrial DNA is exclusively maternal in origin being inherited from the egg, not the sperm. Thus the descendents of males affected by mitochondrial diseases are safe from inheriting the disease. The di seases can however affect men and women equally. [Passarge 2006] Some common mitochondrial diseases include: Lebers optic atrophy MELAS (mitochondrial encephalopathy with lactic acidosis and stroke like episodes) Kearns- Sayres syndrome Some familial types of diabetes mellitus Some forms of progressive nerve deafness and antibiotic associated deafness MERRF (myoclonic epilepsy with ragged red fibres) Pearson syndrome [Naviaux 2008] Parkinsons disease is a degenerative disorder affecting the basal ganglia. It causes degeneration of the dopaminergic neurons in the substantia nigra, leading to decreased inhibition of the subthalamic nuclei and more active inhibition of the cortex. Its is characterized clinically by a triad of bradykinesia, tremor and rigidity. The exact cause for the development of parkinsonism has so far remained elusive. A syndrome very similar to parkinsonism is seen to develop in individuals who abuse methyl-phenyl tetra hydropyridine. This lends support to the theory that environmental factors are responsible for the causation of the disease. The current belief is that genetic and environmental factors both have a role to play. There are no diagnostic tests, and the condition is

(SAVE OUR STUDENTS) SCHOLARSHIP PERSONAL STATEMENT

(SAVE OUR STUDENTS) SCHOLARSHIP - Personal Statement Example As we all know, health insurance will cover only a partial amount of medical needs, and since my mother fell ill we have seen the medical bills pile up faster than expected. Our out of pocket costs were larger than my father could have ever imagined, and he was forced to dip into my college fund to cover the amount of money needed to help lower my mothers medical expenditures. This situation was not something that could have totally depleted my college fund though. Another event happened that has finally pushed my familys finances over the edge. In what can only be called a double whammy of bad luck, my father has been injured at work. This work-related injury has sidelined him from the workforce and has depleted our family savings in the process. Needless to say, my parents’ medical needs take priority over my college education. So it comes as no surprise that my college fund went from helping keep me in the college to helping keep food on the table and bill collectors at bay. At this crucial stage of my health science educational career, it is imperative that I stay in school. I am only a number of units shy of graduating from my chosen major, which I hope to parlay for a nursing education in 2013. However, I can afford to pay for my school fees this coming school year only if I manage to obtain some financial aid. Due to the situation of my parents, I am not in a position to look for a full-time job that will allow me to attend college on my days off. These days, I help augment the family income by working on a part-time basis as a cashier and delivery person. Part-time jobs will not help me pay for my college bills and the needs of my family. That is why I have chosen to become pro-active and to apply for financial aid and scholarships whenever possible. My grades in schools are pretty decent. I have been able to keep up my grade point average despite the situation that I find myself in at home. I managed to

To construct a small commercial database and demonstrate its Essay

To construct a small commercial database and demonstrate its functionality - Essay Example To get the selected items delivered, the user has to register with the site and set up a payment and delivery plan. The order details are mailed to the user’s registered email. Delivery (ID, IssueDate, IssueTime, Type, DeliveryDate, mobileNumber,RecipientFirstName, RecipientLastName, RecipientAddressLine1, RecipientAddressLine2, RecipientCity, RecipientPostCode, RecipientPhone) The attributes completely represent all required aspects of the delivery. If the customer wishes to have the products delivered at residence, the option can be selected or the customer can get the order shipped to a particular shop. Brand Name is to be considered as an attribute of a separate entity brand. This is to ensure, a particular brand name is always referred to with the same spelling and name description. In case the name of the brand changes, only one change will have to be made. The item selected is usually not timestamped. The item stays in the cart only till the user’s login session. In case, a user logs out without checking out, the selected item is sent back to the available product

(SAVE OUR STUDENTS) SCHOLARSHIP PERSONAL STATEMENT

(SAVE OUR STUDENTS) SCHOLARSHIP - Personal Statement Example As we all know, health insurance will cover only a partial amount of medical needs, and since my mother fell ill we have seen the medical bills pile up faster than expected. Our out of pocket costs were larger than my father could have ever imagined, and he was forced to dip into my college fund to cover the amount of money needed to help lower my mothers medical expenditures. This situation was not something that could have totally depleted my college fund though. Another event happened that has finally pushed my familys finances over the edge. In what can only be called a double whammy of bad luck, my father has been injured at work. This work-related injury has sidelined him from the workforce and has depleted our family savings in the process. Needless to say, my parents’ medical needs take priority over my college education. So it comes as no surprise that my college fund went from helping keep me in the college to helping keep food on the table and bill collectors at bay. At this crucial stage of my health science educational career, it is imperative that I stay in school. I am only a number of units shy of graduating from my chosen major, which I hope to parlay for a nursing education in 2013. However, I can afford to pay for my school fees this coming school year only if I manage to obtain some financial aid. Due to the situation of my parents, I am not in a position to look for a full-time job that will allow me to attend college on my days off. These days, I help augment the family income by working on a part-time basis as a cashier and delivery person. Part-time jobs will not help me pay for my college bills and the needs of my family. That is why I have chosen to become pro-active and to apply for financial aid and scholarships whenever possible. My grades in schools are pretty decent. I have been able to keep up my grade point average despite the situation that I find myself in at home. I managed to

Europe in the Renaissance Essay Example | Topics and Well Written Essays - 1750 words - 1

Europe in the Renaissance - Essay Example A major theme of Renaissance in England was a transition from purely religious ways of life (even in architecture and art) to a more secular mode of living, which included a shift from the way people idealised various things and concepts to a different outlook. The Church was no longer being considered a source of instruction in political, religious, social and individual matters. Rather, dissolution of power was taking place while the Church remained a religious identity while the power to deal with matters of law and government were vested with the (oft secular) political government. Hence, while there was a less opportunity to progress and open up to different varied disciplines while the Church was in power, people could focus on the development of culture and art during and after the Renaissance period. This is the reason why much emphasis is paid and research effort given to the cultural and art development during this period and there is much less focus on the political change . There was also an element of foreign ideas’ mixture into the concepts and ideas that were gaining popularity in England which eventually gave rise to a whole Renaissance theme containing a blend of traditional and modern ideas (The Columbia Electronic Encyclopedia). â€Å"I call it our English Renaissance as it is certainly a type of new beginning of the character of man, like the great Italian Renaissance of the 1500s, in its wish for a more affable and comely approach of life, its obsession for physical beauty, its elite notice to shape, its seeking for new subjects for poetry, new intellectual, new forms of art, and imaginative enjoyments: and I call it our romantic association since it is our most current appearance of beauty. We describe it as a mere restoration of Greek modes of thinking, and again as a mere recovery of mediaeval feeling. Rather I would say that to these forms of the human spirit it has added anything of artistic value the complexity and density

Cross-Cultural Perspectives Essay Example for Free

Cross-Cultural Perspectives Essay The Coca Cola Company, the world’s largest multinational beverage manufacturer and corporation, operates bottling plants and sells its products in more than 200 countries across the globe (The Coca Cola Company, 2014). Coca Cola’s massive global presence requires the organization to understand the different cultures of its many host countries; the laws within each country; and the business norms, styles, as well as practices of each country it conducts business operations in. The company has developed and implemented numerous policies, regulations, and guidelines for its suppliers, operation management, and employees in its various host countries. But, all of this detailed undertaking to address transparencies in the corporation’s supply chains throughout the world did not stop its El Salvadoran bottling and manufacturing plant’s management from purchasing refined sugar from a mill which used child labor. According to Human Rights Watch (HRW), up to one third of the workers on El Salvador’s sugarcane plantations are under the age of 18, with many starting to work in the fields between the ages of eight and eleven (HRW, 2004). Even though, the national and international child labor authorities prohibit minors under the age of 18 from performing hazardous or harmful work, plantation owners define these young children and teenagers who work with their parents as â€Å"helpers† instead of the workers they actually are (Veracity, 2006). The above paragraph represents one of the many cross-cultural issues facing Coca Cola and the myriad of other multinational organizations interactions outside the United States. In these various host countries having your children working beside you is considered common cultural practices; it provides additional income for the family’s survival because the poor state of many of their country’s economy (such as El Salvador) allows these injustices to continue. Regardless, of why these children are working in the sugarcane fields, and the fact that Coca Cola does not actually purchase its  refined sugar directly from the plantations, the company is in direct violation of its own â€Å"Guiding Principles for Suppliers to Coca Cola Company† policy. The policy states that, â€Å"Suppliers will not use child labor as defined by local law,† but Coca Cola fails to extend this policy one step further in the supply chain to include the supplier’s supplier of raw material (Veracity, 2006). So, in the long-term means that the organization is just as socially and ethically responsible for the use of child labor as well as the harm working in the field create as the suppliers and the plantation owners. The Coca Cola formula was invented in 1886 by pharmacist John Stith Pemberton in Columbus, Georgia; and the formula as well as the brand was purchased in 1889 by Asa Griggs Chandler who incorporated The Coca Cola Company in 1892 (The Coca Cola Company, 2014). Throughout its many years of operations the business always demonstrated strong market orientation; exhibited strategic decision making processes; and took actions to attract, satisfy, and retain customers. All of these positive actions have just added to company’ s advantage and profitability over competitors in the beverage industry, which is why they are number one in the world. Nevertheless, as the organization began to expand its operations into more and more host countries around the globe it has been involve with quite a number of misconduct and questionable unethical behavior. As a result, these legal and ethical problems have had an impact on the corporation’s financial performances, investor trust, and reduced its sales levels. Today’s Coca Cola Company is now engaging in an operation to rebuild its brand image and credibility, improve its sells, and reinforce its reputation by developing and implementing stronger company ethical and social responsibility throughout its entire global marketplace (The Coca Cola Company, 2014). There have been a number of events other than child labor in El Salvador where Coca Cola has been involved and held accountable in unethical behavior. In Colombia, Turkey, and Guatemala bottling plants the company has been accused of hiring paramilitary mercenaries to assassinate, torture, and coerce workers, their family members, and union leaders as they attempted to unionize to protect workers from unfair treatment and abuse by the host countries’ employers. These incidents sparked an campaign entitled, â€Å"Stop Killer Coke†, and a 2009 PBS documentary filmed by German Gutierezz and Carmen Garcia entitled, â€Å"The Coca-Cola Case†Ã‚  to reveal the company’s practices to consumers around the world (Huff, E. A., 2010). Of course, Coca Cola denied the allegations against the company and its bottling partners, where cleared of any wrong doing in the foreign courts. When the case was brought to the United States, Coca Cola fought and succeeded in having its name removed from the lawsuit (Huff, E. A., 2010). Another ethical and social responsibility issue the company encountered, actually there are two environmental issues concerning the depletion of groundwater and polluting of water in India. Coca Cola operates 52 water intensive bottling plants in India using 3.8 liters of freshwater to generate a liter of carbonated drink. While in the Southern Indian village of Plachimada in Kerala state groundwater along with loca l wells dried up forcing residents to rely on water supplies trucked in daily by the government due to persistent droughts, and the company’s bottling plants. In the rural Indian state of Uttar Pradesh where farming is the primary industry the residents have been experiencing similar conditions, only the government is not supplying enough water for the crops. As a result of the groundwater depletion situations the business is not only responsible for the loss of livelihood and hunger for the many citizens across India, but the creation of thirst. In 2003, the other issues of polluted water were discovered near the Kerala and Uttar Pradesh bottling plants. Sludge containing high levels of cadmium, lead, and chromium was given to farmers as free fertilizer to tribal farmers who lived near the plants, but the need for fresh water was overlooked by Coca Cola. As a side note, an Indian nonprofit group tested 57 carbonated beverages made by both Coca Cola and Pepsi at 25 bottling plants were found to be contaminated with between three and five different pesticides (The Corporation, 2009). Although, the organization denied creating the problems, the Indian government ordered Coca Cola to shut down one of its $25 million plants. The organization then thought long and hard about its corporate social responsibility (and lost revenue); and decided to improve their business practices in the local communities, reduced the water usage by 34%, started rainwater harvesting, and returned substantial amounts of water to depleted aquifers. They also stopped distributing sludge, joined with the Indian government to develop additional solid waste disposal sites, and began treating the water used to make soft drinks with activated carbon filtration (The Corporation, 2009). Coca Cola conducted all of these improvements to regain the trust of the local communities and the Indian government. But, my question would be, why not practice these ethical and corporate responsibility policies from the beginning? As more and more organizations are utilizing the opportunity of transitioning into multinational operations, they will have to research how business is conducted, the local laws, as well as the government policies and operation methods of every host country they wish to operate in. Then they will have to incorporate and implement all of their ethical and corporate social responsibility they employ in their home country universally throughout the entire business operation. Creating a unified culture that will adhere to a high level of business behavior in all global operations, respecting all of the local workforces’ cultures and traditions, and eliminating the use of any unethical values or behaviors from home and abroad. References Huff, E. A. (2010, May, 22). Coca Cola’s Murderous Record of Anti-Union Activity Exposed Retrieved from http://www.naturalnews.com/028844_coca-cola_html. The Coca Cola Company (2014). Retrieved from http://www.coca-colacompany.com/our-company. The Corporation (2009). Ethical Issues Concerning Coca-Cola in India. Retrieved from http://imaginecorporation.blogspot.com/ethical-issues-concerning-cocacola-in.html Veracity, D. (2006). Coca-Cola, Human Rights and Child Labor Retrieved from http://www.naturalmatters.net/article.asp?article=1301cat=219

Light Emitting Diode | Dissertation

Light Emitting Diode | Dissertation Introduction Alight-emitting diode(LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices and are increasingly used for other lighting. Introduced as a practical electronic component in 1962, early LEDs emitted low-intensity red light, but modern versions are available across thevisible, ultraviolet and infrared wavelengths, with very high brightness. When a light-emitting diodeis forward biased (switched on), electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. This effect is calledelectroluminescenceand thecolorof the light (corresponding to the energy of the photon) is determined by the energy gap of the semiconductor. An LED is often small in area (less than 1mm2), and integrated optical components may be used to shape its radiation pattern.LEDs present manyadvantagesover incandescent light sources includinglower energy consumption, longerlifetime, improved robustness, smaller size, faster switching, and greater durability and reliability. LEDs powerful enough for room lighting are relatively expensive and require more precise current andheat managementthan compactfluorescent lampsources of comparable output. Light-emitting diodes are used in applications as diverse as replacements foraviation lighting,automotive lighting(particularly brake lamps, turn signals and indicators) as well as intraffic signals. The compact size, the possibility of narrow bandwidth, switching speed, and extreme reliability of LEDs has allowed new text and video displays and sensors to be developed, while their high switching rates are also useful in advanced communications technology.InfraredLEDs are also used in theremote controlunits of many commercial products including televisions, DVD players, and other domestic appliances. History Discoveries and early devices Green electroluminescence from a point contact on a crystal ofSiCrecreatesH. J. Rounds original experiment from 1907. Electroluminescenceas a phenomenon was discovered in 1907 by the British experimenterH. J. RoundofMarconi Labs, using a crystal ofsilicon carbideand acats-whisker detector.RussianOleg Vladimirovich Losevreported on the creation of a first LED in 1927.His research was distributed in Russian, German and British scientific journals, but no practical use was made of the discovery for several decades. Rubin Braunstein of theRadio Corporation of Americareported on infrared emission fromgallium arsenide(GaAs) and other semiconductor alloys in 1955.Braunstein observed infrared emission generated by simple diode structures usinggallium antimonide(GaSb), GaAs,indium phosphide(InP), andsilicon-germanium(SiGe) alloys at room temperature and at 77kelvin. In 1961, American experimenters Robert Biard and Gary Pittman working atTexas Instruments,found that GaAs emitted infrared radiation when electric current was applied and received the patent for the infrared LED. The first practical visible-spectrum (red) LED was developed in 1962 byNick Holonyak Jr., while working atGeneral Electric Company.Holonyak is seen as the father of the light-emitting diode.M. George Craford,a former graduate student of Holonyak, invented the first yellow LED and improved the brightness of red and red-orange LEDs by a factor of ten in 1972. In 1976, T.P. Pearsall created the first high-brightness, high efficiency LEDs for optical fiber telecommunications by inventing new semiconductor materials specifically adapted to optical fiber transmission wavelengths. Until 1968, visible and infrared LEDs were extremely costly, on the order of US $200 per unit, and so had little practical use.TheMonsanto Companywas the first organization to mass-produce visible LEDs, using gallium arsenide phosphide in 1968 to produce red LEDs suitable for indicators. Hewlett Packard(HP) introduced LEDs in 1968, initially using GaAsP supplied by Monsanto. The technology proved to have major uses for alphanumeric displays and was integrated into HPs early handheld calculators. In the 1970s commercially successful LED devices at fewer than five cents each were produced by Fairchild Optoelectronics. These devices employed compound semiconductor chips fabricated with theplanar processinvented by Dr. Jean Hoerni atFairchild Semiconductor.The combination of planar processing for chip fabrication and innovative packaging methods enabled the team at Fairchild led by optoelectronics pioneer Thomas Brandt to achieve the needed cost reductions. These methods continue to be u sed by LED producers. History Of LEDs and LED Technology Light Emitting Diode (LED) Light Emitting Diode (LED) is essentially a PN junction semiconductor diode that emits a monochromatic (single color) light when operated in a forward biased direction. The basic structure of an LED consists of the die or light emitting semiconductor material, a lead frame where the die is actually placed, and the encapsulation epoxy which surrounds and protects the die (Figure 1). The first commercially usable LEDs were developed in the 1960s by combining three primary elements: gallium, arsenic and phosphorus (GaAsP) to obtain a 655nm red light source. Although the luminous intensity was very low with brightness levels of approximately 1-10mcd @ 20mA, they still found use in a variety of applications, primarily as indicators. Following GaAsP, GaP, or gallium phosphide, red LEDs were developed. These devices were found to exhibit very high quantum efficiencies, however, they played only a minor role in the growth of new applications for LEDs. This was due to two reasons: First, the 700nm wavelength emission is in a spectral region where the sensitivity level of the human eye is very low (Figure 2) and therefore, it does not appear to be very bright even though the efficiency is high (the human eye is most responsive to yellow-green light). Second, this high efficiency is only achieved at low currents. As the current increases, the efficiency decreases. This pr oves to be a disadvantage to users such as outdoor message sign manufacturers who typically multiplex their LEDs at high currents to achieve brightness levels similar to that of DC continuous operation. As a result, GaP red LEDs are currently used in only a limited number of applications. As LED technology progressed through the 1970s, additional colors and wavelengths became available. The most common materials were GaP green and red, GaAsP orange or high efficiency red and GaAsP yellow, all of which are still used today (Table3). The trend towards more practical applications was also beginning to develop. LEDs were found in such products as calculators, digital watches and test equipment. Although the reliability of LEDs has always been superior to that of incandescent, neon etc., the failure rate of early devices was much higher than current technology now achieves. This was due in part to the actual component assembly that was primarily manual in nature. Individual operators performed such tasks as dispensing epoxy, placing the die into position, and mixing epoxy all by hand. This resulted in defects such as epoxy slop which caused VF (forward voltage) and VR (reverse voltage) leakage or even shorting of the PN junction. In addition, the growth methods and materia ls used were not as refined as they are today. High numbers of defects in the crystal, substrate and epitaxial layers resulted in reduced efficiency and shorter device lifetimes. Gallium Aluminum Arsenide It wasnt until the 1980s when a new material, GaAlAs (gallium aluminum arsenide) was developed, that a rapid growth in the use ofLEDsbegan to occur. GaAlAs technology provided superior performance over previously availableLEDs. The brightness was over 10 times greater than standardLEDsdue to increased efficiency and multi-layer, heterojunction type structures. The voltage required for operation was lower resulting in a total power savings. TheLEDscould also be easily pulsed or multiplexed. This allowed their use in variable message and outdoor signs.LEDswere also designed into such applications as bar code scanners, fiber optic data transmission systems, and medical equipment. Although this was a major breakthrough inLEDtechnology, there were still significant drawbacks to GaAlAs material. First, it was only available in a red 660nm wavelength. Second, the light output degradation of GaAlAs is greater than that of standard technology. It has long been a misconception withLEDsthat lig ht output will decrease by 50% after 100,000 hours of operation. In fact, some GaAlAsLEDsmay decrease by 50% after only 50,000 -70,000 hours of operation. This is especially true in high temperature and/or high humidity environments. Also during this time, yellow, green and orange saw only a minor improvement in brightness and efficiency which was primarily due to improvements in crystal growth and optics design. The basic structure of the material remained relatively unchanged. To overcome these difficult issues new technology was needed.LEDdesigners turned to laser diode technology for solutions. In parallel with the rapid developments inLEDtechnology, laser diode technology had also been making progress. In the late 1980s laser diodes with output in the visible spectrum began to be commercially produced for applications such as bar code readers, measurement and alignment systems and next generation storage systems.LEDdesigners looked to using similar techniques to produce high brightness and high reliabilityLEDs. This led to the development of InGaAlP (Indium Gallium Aluminum Phosphide) visibleLEDs. The use of InGaAlP as the luminescent material allowed flexibility in the design ofLEDoutput color simply by adjusting the size of the energy band gap. Thus, green, yellow, orange and redLEDsall could be produced using the same basic technology. Additionally, light output degradation of InGaAlP material is significantly improved even at elevated temperature an d humidity. Current Developments of LED Technology InGaAlPLEDstook a further leap in brightness with a new development by Toshiba, a leading manufacturer ofLEDs. Toshiba, using the MOCVD (Metal Oxide Chemical Vapor Deposition) growth process, was able to produce a device structure that reflected 90% or more of the generated light traveling from the active layer to the substrate back as useful light output (Figure 4). This allowed for an almost two-fold increase in theLEDluminance over conventional devices.LEDperformance was further improved by introducing a current blocking layer into theLEDstructure (Figure 5). This blocking layer essentially channels the current through the device to achieve better device efficiency. As a result of these developments, much of the growth forLEDsin the 1990s will be concentrated in three main areas: The first is in traffic control devices such as stop lights, pedestrian signals, barricade lights and road hazard signs. The second is in variable message signs such as the one located in Times Square New York which displays commodities, news and other information. The third concentration would be in automotive applications. The visibleLEDhas come a long way since its introduction almost 30 years ago and has yet to show any signs of slowing down. A BlueLED, which has only recently become available in production quantities, will result in an entire generation of new applications. BlueLEDsbecause of their high photon energies (>2.5eV) and relatively low eye sensitivity have always been difficult to manufacture. In addition the technology necessary to fabricate theseLEDsis very different and far less advanced than standardLEDmaterials. The blueLEDsavailable today consist of GaN (gallium nitride) and SiC (silicon carbide) construction with brightness levels in excess of 1000mcd @ 20mA for GaN devices. Since blue is one of the primary colors, (the other two being red and green), full color solid stateLEDsigns, TVs etc. will soon become commercially available. Full colorLEDsigns have already been manufactured on a small prototype basis, however, due to the high price of blueLEDs, it is still not practical on a large scale. Other applications for blueLEDsinclude medical diagnostic equipment and photolithography. LED Colors It is also possible to produce other colors using the same basic GaN technology and growth processes. For example, a high brightness green (approximately 500nm)LEDhas been developed that is currently being evaluated for use as a replacement to the green bulb in traffic lights. Other colors including purple and white are also possible. With the recent introduction of blueLEDs, it is now possible to produce white by selectively combining the proper combination of red, green and blue light. This process however, requires sophisticated software and hardware design to implement. In addition, the brightness level is low and the overall light output of each RGB die being used degrades at a different rate resulting in an eventual color unbalance. Another approach being taken to achieve white light output, is to use a phosphor layer (Yttrium Aluminum Garnet) on the surface of a blueLED. In summary,LEDshave gone from infancy to adolescence and are experiencing some of the most rapid market growth of their lifetime. By using InGaAlP material with MOCVD as the growth process, combined with efficient delivery of generated light and efficient use of injected current, some of the brightest, most efficient and most reliableLEDsare now available. This technology together with other novelLEDstructures will ensure wide application ofLEDs. New developments in the blue spectrum and on white light output will also guarantee the continued increase in applications of these economical light sources. Practical use The first commercial LEDs were commonly used as replacements forincandescentandneonindicator lamps, and inseven-segment displays,first in expensive equipment such as laboratory and electronics test equipment, then later in such appliances as TVs, radios, telephones, calculators, and even watches (see list ofsignal uses). These red LEDs were bright enough only for use as indicators, as the light output was not enough to illuminate an area. Readouts in calculators were so small that plastic lenses were built over each digit to make them legible. Later, other colors grew widely available and also appeared in appliances and equipment. As LED materials technology grew more advanced, light output rose, while maintaining efficiency and reliability at acceptable levels. The invention and development of the high power white light LED led to use for illumination, which is fast replacing incandescent and fluorescent lighting. (see list ofillumination applications). Most LEDs were made in the ve ry common 5mm T1Â ¾ and 3mm T1 packages, but with rising power output, it has grown increasingly necessary to shed excess heat to maintain reliability,so more complex packages have been adapted for efficient heat dissipation. Packages for state-of-the-arthigh power LEDsbear little resemblance to early LEDs. Continuing development The first high-brightness blue LED was demonstrated byShuji NakamuraofNichia Corporationand was based onInGaNborrowing on critical developments inGaNnucleation on sapphire substrates and the demonstration of p-type doping of GaN which were developed byIsamu Akasakiand H. Amano inNagoya. In 1995,Alberto Barbieriat theCardiff UniversityLaboratory (GB) investigated the efficiency and reliability of high-brightness LEDs and demonstrated a very impressive result by using a transparent contact made ofindium tin oxide(ITO) on (AlGaInP/GaAs) LED. The existence of blue LEDs and high efficiency LEDs quickly led to the development of the firstwhite LED, which employed aY3Al5O12:Ce, or YAG, phosphor coating to mix yellow (down-converted) light with blue to produce light that appears white. Nakamura was awarded the 2006Millennium Technology Prizefor his invention. The development of LED technology has caused their efficiency and light output torise exponentially, with a doubling occurring about every 36 months since the 1960s, in a way similar toMoores law. The advances are generally attributed to the parallel development of other semiconductor technologies and advances in optics and material science. This trend is normally calledHaitzs Lawafter Dr. Roland Haitz. In February 2008, 300lumensof visible light per wattluminous efficacy(not per electrical watt) and warm-light emission was achieved by usingnanocrystals. In 2009, a process for growing gallium nitride (GaN) LEDs on silicon has been reported.Epitaxycosts could be reduced by up to 90% using six-inch silicon wafers instead of two-inch sapphire wafers. Illustration of Haitzs Law. Light output per LED as a function of production year, note the logarithmic scale on the vertical axis Technology Physics The LED consists of a chip of semiconducting materialdopedwith impurities to create ap-n junction. As in other diodes, current flows easily from the p-side, oranode, to the n-side, orcathode, but not in the reverse direction. Charge-carriers—electronsandholes—flow into the junction fromelectrodeswith different voltages. When an electron meets a hole, it falls into a lowerenergy level, and releasesenergyin the form of a photon. Thewavelengthof the light emitted, and thus its color depends on theband gapenergy of the materials forming thep-n junction. Insiliconor germaniumdiodes, the electrons and holes recombine by anon-radiative transitionwhich produces no optical emission, because these are indirect band gapmaterials. The materials used for the LED have adirect band gapwith energies corresponding to near-infrared, visible or near-ultraviolet light. LED development began with infrared and red devices made withgallium arsenide. Advances inmaterials sciencehave enabled making devices with ever-shorter wavelengths, emitting light in a variety of colors. LEDs are usually built on an n-type substrate, with an electrode attached to the p-type layer deposited on its surface. P-type substrates, while less common, occur as well. Many commercial LEDs, especially GaN/InGaN, also usesapphiresubstrate. Most materials used for LED production have very highrefractive indices. This means that much light will be reflected back into the material at the material/air surface interface. Thus,light extraction in LEDsis an important aspect of LED production, subject to much research and development. The inner workings of an LED I-V diagram for adiode. An LED will begin to emit light when the on-voltageis exceeded. Typical on voltages are 2-3volts. Refractive Index Idealized example of light emission cones in a semiconductor, for a single point-source emission zone. The left illustration is for a fully translucent wafer, while the right illustration shows the half-cones formed when the bottom layer is fully opaque. The light is actually emitted equally in all directions from the point-source, so the areas between the cones shows the large amount of trapped light energy that is wasted as heat. The light emission cones of a real LED wafer are far more complex than a single point-source light emission. Typically the light emission zone is a 2D plane between the wafers. Across this 2D plane, there is effectively a separate set of emission cones for every atom. Drawing the billions of overlapping cones is impossible, so this is a simplified diagram showing the extents of all the emission cones combined. The larger side cones are clipped to show the interior features and reduce image complexity; they would extend to the opposite edges of the 2D emission plane. Bare uncoated semiconductors such assiliconexhibit a very highrefractive indexrelative to open air, which prevents passage of photons at sharp angles relative to the air-contacting surface of the semiconductor. This property affects both the light-emission efficiency of LEDs as well as the light-absorption efficiency ofphotovoltaic cells. The refractive index of silicon is 4.24, while air is 1.00002926. Generally a flat-surfaced uncoated LED semiconductor chip will only emit light perpendicular to the semiconductors surface, and a few degrees to the side, in a cone shape referred to as thelight cone,cone of light,or theescape cone.The maximumangle of incidenceis referred to as thecritical angle. When this angle is exceeded photons no longer penetrate the semiconductor, but are instead reflected both internally inside the semiconductor crystal, and externally off the surface of the crystal as if it were amirror. Internal reflectionscan escape through other crystalline faces, if the incidence angle is low enough and the crystal is sufficiently transparent to not re-absorb the photon emission. But for a simple square LED with 90-degree angled surfaces on all sides, the faces all act as equal angle mirrors. In this case the light cannot escape and is lost as waste heat in the crystal. A convoluted chip surface with angledfacetssimilar to a jewel orfresnel lenscan increase light output by allowing light to be emitted perpendicular to the chip surface while far to the sides of the photon emission point. The ideal shape of a semiconductor with maximum light output would be amicrospherewith the photon emission occurring at the exact center, with electrodes penetrating to the center to contact at the emission point. All light rays emanating from the center would be perpendicular to the entire surface of the sphere, resulting in no internal reflections. A hemispherical semiconductor would also work, with the flat back-surface serving as a mirror to back-scattered photons. Transition coatings Many LED semiconductor chips arepottedin clear or colored molded plastic shells. The plastic shell has three purposes: 1. Mounting the semiconductor chip in devices is easier to accomplish. 2. The tiny fragile electrical wiring is physically supported and protected from damage 3. The plastic acts as a refractive intermediary between the relatively high-index semiconductor and low-index open air. The third feature helps to boost the light emission from the semiconductor by acting as a diffusing lens, allowing light to be emitted at a much higher angle of incidence from the light cone, than the bare chip is able to emit alone. Efficiency and operational parameters Typical indicator LEDs are designed to operate with no more than 30-60mWof electrical power. Around 1999,Philips Lumiledsintroduced power LEDs capable of continuous use at oneW. These LEDs used much larger semiconductor die sizes to handle the large power inputs. Also, the semiconductor dies were mounted onto metal slugs to allow for heat removal from the LED die. One of the key advantages of LED-based lighting is its high efficacy,[dubious-discuss]as measured by its light output per unit power input. White LEDs quickly matched and overtook the efficacy of standard incandescent lighting systems. In 2002, Lumileds made five-watt LEDs available with aluminous efficacyof 18-22 lumens per watt (lm/W). For comparison, a conventional 60-100 Wincandescent light bulbemits around 15 lm/W, and standardfluorescent lightsemit up to 100 lm/W. A recurring problem is that efficacy falls sharply with rising current. This effect is known asdroopand effectively limits the light output of a given LED, raising heating more than light output for higher current. In September 2003, a new type of blue LED was demonstrated by the companyCree Inc.to provide 24mW at 20milliamperes(mA). This produced a commercially packaged white light giving 65 lm/W at 20 mA, becoming the brightest white LED commercially available at the time, and more than four times as efficient as standard incandescents. In 2006, they demonstrated a prototype with a record white LED luminous efficacy of 131 lm/W at 20 mA. Also,Seoul Semiconductorplans for 135 lm/W by 2007 and 145 lm/W by 2008,which would be nearing an order of magnitude improvement over standard incandescents and better than even standard fluorescents.Nichia Corporationhas developed a white LED with luminous efficacy of 150 lm/W at a forward current of 20 mA. Practical general lighting needs high-power LEDs, of one watt or more. Typical operating currents for such devices begin at 350 mA. Note that these efficiencies are for the LED chip only, held at low temperature in a lab. Lighting works at higher temperature and with drive circuit losses, so efficiencies are much lower.United States Department of Energy(DOE) testing of commercial LED lamps designed to replace incandescent lamps orCFLsshowed that average efficacy was still about 46 lm/W in 2009 (tested performance ranged from 17lm/W to 79lm/W). Cree issued a press release on February 3, 2010 about a laboratory prototype LED achieving 208 lumens per watt at room temperature. The correlatedcolor temperaturewas reported to be 4579K. Lifetime and failure Main article:List of LED failure modes Solid state devices such as LEDs are subject to very limitedwear and tearif operated at low currents and at low temperatures. Many of the LEDs made in the 1970s and 1980s are still in service today. Typical lifetimes quoted are 25,000 to 100,000 hours but heat and current settings can extend or shorten this time significantly. The most common symptom of LED (anddiode laser) failure is the gradual lowering of light output and loss of efficiency. Sudden failures, although rare, can occur as well. Early red LEDs were notable for their short lifetime. With the development of high-power LEDs the devices are subjected to higherjunction temperaturesand higher current densities than traditional devices. This causes stress on the material and may cause early light-output degradation. To quantitatively classify lifetime in a standardized manner it has been suggested to use the terms L75 and L50 which is the time it will take a given LED to reach 75% and 50% light output respectively. Like other lighting devices, LED performance is temperature dependent. Most manufacturers published ratings of LEDs are for an operating temperature of 25Â °C. LEDs used outdoors, such as traffic signals or in-pavement signal lights, and that are utilized in climates where the temperature within the luminaire gets very hot, could result in low signal intensities or even failure. LED light output actually rises at colder temperatures (leveling off depending on type at around −30C). Consequently, LED technology may be a good replacement in uses such as supermarket freezer lightingand will last longer than other technologies. Because LEDs emit less heat than incandescent bulbs, they are an energy-efficient technology for uses such as freezers. However, because they emit little heat, ice and snow may build up on the LED luminaire in colder climates.This lack of waste heat generation has been observed to cause sometimes significant problems with street traffic signals and airport runway lighting in snow-prone areas, although some research has been done to try to develop heat sink technologies to transfer heat to other areas of the luminaire. Ultraviolet and blue LEDs BlueLEDs. Blue LEDs are based on the wideband gapsemiconductors GaN (gallium nitride) andInGaN(indium gallium nitride). They can be added to existing red and green LEDs to produce the impression of white light, though white LEDs today rarely use this principle. The first blue LEDs were made in 1971 by Jacques Pankove (inventor of the gallium nitride LED) atRCA Laboratories.These devices had too little light output to be of much practical use. In August of 1989, Cree Inc. introduced the first commercially available blue LED.In the late 1980s, key breakthroughs in GaNepitaxialgrowth andp-typedoping ushered in the modern era of GaN-based optoelectronic devices. Building upon this foundation, in 1993 high brightness blue LEDs were demonstrated. By the late 1990s, blue LEDs had become widely available. They have an active region consisting of one or more InGaNquantum wellssandwiched between thicker layers of GaN, called cladding layers. By varying the relative InN-GaN fraction in the InGaN quantum wells, the light emission can be varied from violet to amber. AlGaNaluminium gallium nitrideof varying AlN fraction can be used to manufacture the cladding and quantum well layers for ultraviolet LEDs, but these devices have not yet reached the level of efficiency and technological maturity of the InGaN-GaN blue/green devices. If the active quantum well layers are GaN, instead of alloyed InGaN or AlGaN, the device will emit near-ultraviolet light with wavelengths around 350-370nm. Green LEDs manufactured from the InGaN-GaN system are far more efficient and brighter than green LEDs produced with non-nitride material systems. With nitrides containing aluminium, most oftenAlGaNandAlGaInN, even shorter wavelengths are achievable. Ultraviolet LEDs in a range of wavelengths are becoming available on the market. Near-UV emitters at wavelengths around 375-395nm are already cheap and often encountered, for example, asblack lightlamp replacements for inspection of anti-counterfeitingUV watermarks in some documents and paper currencies. Shorter wavelength diodes, while substantially more expensive, are commercially available for wavelengths down to 247nm.As the photosensitivity of microorganisms approximately matches the absorption spectrum ofDNA, with a peak at about 260nm, UV LED emitting at 250-270nm are to be expected in prospective disinfection and sterilization devices. Recent research has shown that commercially available UVA LEDs (365nm) are already effective disinfection and sterilization devices. Deep-UV wavelengths were obtained in laboratories usingaluminium nitride(210nm),boron nitride(215nm)anddiamond(235nm). White light There are two primary ways of producing high intensity white-light using LEDs. One is to use individual LEDs that emit threeprimary colors—red, green, and blue—and then mix all the colors to form white light. The other is to use a phosphor material to convert monochromatic light from a blue or UV LED to broad-spectrum white light, much in the same way a fluorescent light bulb works. Due tometamerism, it is possible to have quite different spectra that appear white. RGB systems Combined spectral curves for blue, yellow-green, and high brightness red solid-state semiconductor LEDs.FWHMspectral bandwidth is approximately 24-27 nm for all three colors. White lightcan be formed by mixing differently colored lights, the most common method is to usered, green and blue(RGB). Hence the