Use Office Equipment free essay sample

Use Office Equipment 1. Identify different types of equipment and their uses There are many different types of office equipment. The main equipment in an office that can be found is: †¢ Computers †¢ Telephones †¢ Printers †¢ Photocopiers Computers can be used on a daily basis for tasks such as sending and receiving emails, using the internet and company personal sites to use information and equipment and policies to help complete tasks. Telephones help us to keep in contact with many clients/ customers and many members of staff within the company, this can help when a conversation is needed in detail and it is quicker and easier to give them a call that way if they do not answer you can leave them a voicemail which then can be heard by the recipient only when they get the chance to hear the message that way the message is more easy to understand. Printers can be used to print or fax documents that are of use to you and members of your team and potentially to the whole company faxing a document allows us to scan a document into your printer and send it via email to another member of staff/ yourself or a client. We will write a custom essay sample on Use Office Equipment or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page This is usually used for a written or paper copy document that you don’t have on any computer. This will allow you to have the files in both paper and computer form so that files will always be found and can be stored so that the files can be easily found. Photocopiers can be used to create paper copies of documents that you have in paper form this will help you if you need more copies of a specific document but you don’t have time to go back to your computer and find the file on there you can put your document though a copier and it will scan all the text and images and it will print out copies of your file as many time as you like. 2. Describe the different features of different types of office equipment There are many different types of office equipment that we use on a daily basis. Phones and emails allow us as a company to keep in contact with our clients and staff in offices around the word. They allow us to contact specific people when we need to which allows us to get in contact with them quickly and efficiently. Phones also have answering machines to pick up any missed call’s, this allows us to know who called us and if they left a message what they wanted to talk to us about, this allows us to keep in contact with all the right people. Computers are one of the most vital parts of the company as just about all of our work is done on them. Computers allow us process data on daily basis; it also allows us to research information online as an when we need it. It also helps us to create PF files and information for our clients. Printers can print documents and information in bulk this allows us to have as many copies of the files as you need and this is very helpful when you have a meeting or they are a set of instructions on a specific activity that several people need and Photocopiers allow you to scan a hard copy of a file and will make a copy of all the text and photos and print out several copies of the file for you. Filing Cabinets help you to organise and store all hard copies of files and information securely so that when you need the files you do not have to try a search around your computer to find the files. Hole punchers allow paperwork to be place in binders or in small folders easily which allows use to create more space for other things. 3. Explain why different types of equipment are chosen for tasks Different types of equipment are used and chosen for different tasks because not one piece of equipment can do every single task, so it is always good to have all the relevant types of office equipment to complete a task. Also using the right piece of equipment for that specific task will take up as little of your time as possible so you can meet targets and deadlines, and also the equipment that will help you to complete the task to the best standard. 2. 1 Explain the purpose of following manufacturer’s instructions when using equipment The purpose of following the manufacturer’s instructions when using a piece of equipment is that if you dont use the equipment properly, you can damage it. Improper usage can also cancel the warranty, which causes unnecessary replacement costs for the organization. Also those instructions from the manufacturer are there for a reason for both the heath and safety of the person using the equipment but the people around them and also to make sure that the equipment can continue to work to the best of its ability. 2. 2 Explain the purpose of following organisational instructions when using equipment The purpose of following organisational instructions when using equipment is because its for employees Health and safety and also to be able to know what to do in certain situations when something goes wrong with the equipment. Organisational procedures are there to protect the health and safety of all workers and make sure that problems are dealt with by the appropriate person. If you do not follow these then you could potentially hurt yourself or other members of staff around you . 2. 3 Identify health and safety procedures when using equipment Thebigword has its own Health and Safety procedures when working with equipment and other members off staff. There are responsibilities required all members of staff regarding Health and Safety: Take reasonable care for their own Health and Safety and that of others who may be affected by their acts or omissions at work; †¢ Co-operate with management on Health and Safety matters; †¢ Use equipment and materials safely and follow instructions and training provided; †¢ Report all accidents, hazards and any shortfalls in the Health and Safety arrangements that creates a risk to people; †¢ Not intentionally or recklessly interfere with or misuse anyt hing provided in the interest of health, safety or welfare. Failure to comply with these requirements may lead to both disciplinary action being taken by the Company and prosecution by the Health and Safety enforcing agency. So it is important that everyone makes sure that they make sure that regular checks are done on the equipment and if you spot any faults or problems that you report into your manager and a member of the IT support team as well as health and safety so that it can be fixed as soon as possible so that it dose not cause any harm to any member staff. . 4 Explain the purpose of following health and safety procedures when using equipment The purpose of following health and safety procedures when using equipment is that it will help to minimise accidents and the negative consequences of those accidents and it also helps to promote a positive health and safety culture within the company . 2. 5 Explain the purpose of keeping the equipment clean and hygienic It is important to maintain your equipment and keep it clean to keep the computer running for years on end without having to replace the equipment so often and so that you to get the most use out of it. Cleaning your equipment after use can lead to less problems , For example dust getting inside the equipment and potentially creating a fault in the equipment. It is also polite to clean something after you have used it to make it ready for the next user if computers are shared between several people. Regularly cleaning equipment can mean that it will last you longer and save you money as well as producing a higher quality result. For example if you did not clean a photocopier glass then you could end up with smear marks on your work. 3. 1 Give examples of waste when using equipment One example of waste when using equipment in the office is when most employees leave the office for the day and will leave the computer on standby over night or they may even leave the computer running all night. But even though it is on standby it is still using electricity and can waste a lot of electricity on a daily basis and potentially put the company’s electricity bill up so you are better of shutting down your computer and that way you will save electricity and money. Another example of waste is when using the printer, some people print out more copies of a file than is needed because they worry they may not have enough copies of the file to go round to the people on there team or the people who need them and this can be a waste of paper and electricity from the printer if they print out too may copies. . 2 Give examples of ways to reduce waste When using your computer it is always best to shut down your computer and turn of your monitor and switch off the lights if you are last out of the building and that way you will save o both electricity and money, which can be saved and used the next working day. When printing out files or instructions it is always good to print out less copies that you think you need and then if you need more you can see how many more people need a copy of the file that way you can print out the correct amount of copies and that way you will save paper. . 3 Explain the purpose of minimising waste The purpose of improving efficiency is so that raw materials can be managed in order to minimise waste and this will help the company to reduce its costs also minimising waste can have a positive effect on the environment if it is done on a regular basis. 4. 1 Give examples of equipment problems There are many problems that can crop with equipment in an office such as: †¢ Paper jam †¢ Electrical fault †¢ Ink cartridge failure †¢ Computer lead fault †¢ Keyboard fault. E. G. missing keys or jammed keys. †¢ Faulty telephone line †¢ Button jam For these you can ask members of staff if they know how to resolve the problem if not you can inform your manager and the IT Support team about the problem and they will do there best to fix the problem to get things running smoothly. 4. 2 Explain the purpose of following manufacturer’s instructions when dealing with problems The purpose of following the instructions from the manufacturer are there for a reason for both the heath and safety of the person using the equipment but the people around them and also to make sure that the equipment can continue to work to the best of its ability. . 3 Give example of how to deal with problems For some problems you can ask members of staff if they know how to resolve the problem if not you can inform your manager and the IT Support team about the problem and they will do there best to fix the problem to get things running smoothly again so that you can carry on with your job. 5. 1 Explain the purpose of meeting work standards and deadli nes when using equipment The purpose of meeting work standards and deadlines when using equipment will allow for all work to be at a good level of quality. This will show that you are responsible and people can put trust in you and they can rely on you to get jobs done on time with a high level of quality. You do not know who else might be waiting for your work; it could have to be passed on to someone else. It is important to use the office equipment quickly and efficiently so that it is ready for the next person to use. If you take a long time using something for example the printer and someone else needs to use it you could be stopping someone else from meeting their deadlines. 6. Explain the purpose of leaving equipment and the work area ready for the next user The Purpose of leaving equipment and work area ready for the next user because in a business environment people are working to a tight deadline and if you have left your work area or the equipment as it was when you last used it, then this becomes time consuming for the next person who wants to use it, because they will have to check that all the settings have been changed ba ck to normal. It is important to leave everything as you had found it. That way you can make the other persons job a little easier for them to do.

These Are the Easiest AP Classes for You

These Are the Easiest AP Classes for You SAT / ACT Prep Online Guides and Tips What are the easiest AP classes and/or the easiest AP tests? Answering this question isn’t so simple as just giving you a list, since there are a lot of factors that could make an AP class easy. The easiest AP tests could have hard classes to go with them, or vice versa. You also have to think about your school, the national average scores, and your own personal strengths when figuring out which AP courses are relatively easy. But don’t worry- we’ll help you break down these factors and decide which AP tests will be easiest for you! In this article, we'll first discuss your particular situation- your skills and your school. Then, we'll look at national data on passing rates and reputation for easiness. How Do Your Skills Affect Which AP Tests Are Easiest? The very first thing you should consider when deciding which AP tests are easiest is, well, you! Any topic that you are good at or comfortable with will be easier for you than classes you are less experienced in. For example, if you’re a good writer and have always done well in Language Arts/English classes, you will probably find both AP English Literature and AP English Language will be manageable for you, even though their rates of scoring a perfect 5 are pretty low (under 11%). (Read more about AP scoring here.) As another example, if you have always liked math and have taken math classes up through pre-calculus, you may find AB or even BC Calculus fairly easy, especially if your school has a good teacher (more on that in a minute). Remember, one student’s easy AP class could be another student’s nightmare! So even as you consider things like passing rate and teachers, keep in mind you shouldn’t just go on a class’s reputation alone when choosing an AP class. Trust your own instincts and strengths! Want to get a perfect 5 on your AP exam and an A in class? We can help. PrepScholar Tutors is the world's best tutoring service. We combine world-class expert tutors with our proprietary teaching techniques. Our students have gotten A's on thousands of classes, perfect 5's on AP tests, and ludicrously high SAT Subject Test scores. Whether you need help with science, math, English, social science, or more, we've got you covered. Get better grades today with PrepScholar Tutors. How Does Your School Affect Which AP Tests Are Easiest? Another important factor to consider is your school and teachers. For example, if there is a teacher at your school who has taught AP US History for 10 years, has their curriculum down pat, and has a higher passing rate than the national average, you’ll have a high shot of passing, even though AP US History has one of the lowest national passing rates. This can even be true of other AP classes considered tough by reputation, like AP Physics, AP Biology, and AP English Literature. This also means that if you take an AP class from a teacher who has never taught it before, you might have to plan on doing more studying on your own. The new teacher might not have as much experience with timing the curriculum or working practice tests into their class schedules. Don't underestimate the importance of practice tests! So this means when signing up for AP classes, don’t just look at what your school offers. Try to find out who teaches it and figure out their reputation. But how can you do this? #1: Ask your guidance counselor. They should know about how many students take the AP class every year, what the teacher’s exam pass rate is, and if they notice students switching out of the class often. That could be a sign the course is challenging or students don’t do well with the teacher. #2: Talk to upperclassmen who have taken the class. If you have older siblings, or older friends from clubs or sports, you can ask about what they have heard about certain teachers. Don’t rely only on what other kids say about a teacher, but for example, if every student you talk to says they have heard the AP Biology teacher is amazing and all their friends have passed the AP test, that’s a good sign! #3: Talk to your current teachers. Especially if you are in an AP prerequisite class, like a biology class that feeds into AP biology, the teacher probably knows plenty of students who have gone on to take AP and has heard about how well they do. What About the AP Class Itself? Another factor to consider is how hard the class itself will be, not just the AP exam. This is something that varies based on your school and the teacher teaching the class. As an example, I took two tough AP classes my sophomore year- AP World History and AP Biology. Both exams were very hard, but the classes were two very different experiences. Even though the World History exam was hard and I studied a lot, the class itself wasn’t hard to pass. The teacher even automatically changed our grades for the last semester to an A just for taking the AP test! However, for AP Biology, our teacher assigned very tough tests and lots of homework, including making several flashcards for every single textbook chapter. It was very hard to get an A in that class. To find out how hard an AP class will be, you can use the same tips we mentioned above to learn about a class’s reputation. As a general rule, the more material there is to cover before an examination, the harder the class will probably be. Calculus BC, Biology, and English Literature have tough reputations in a lot of schools since there is more material to cover. US Government, Psychology, Human Geography, and Environmental Science tend to be easier since there is comparatively less to cover before the exam. Also keep in mind that some schools weight AP classes, so they can boost your GPA if you do well. Average AP Passing Rates: What We Can Learn The passing rate for each AP test is where many students start when trying to figure out the easiest AP classes. Check out our table below to see which exams have the most and least students pass. Exam Name Passing Rate (3+) 5 Rate Studio Art: Drawing 91.1% 20.8% Spanish Language and Culture 89% 24.9% Chinese Language and Culture 88.3% 57.2% Studio Art: 2-D Design 86.4% 21% Calculus BC 81.5% 43.2% Physics C: Electricity Magnetism 81.1% 35.9% Seminar 80.7% 6.8% French Language and Culture 76.7% 15.5% Research 76.2% 10.8% Japanese Language and Culture 75% 38.2% Computer Science Principles 72.7% 13.6% Spanish Literature 71.9% 9.1% Physics C: Mechanics 71.1% 34.6% German Language and Culture 70.5% 18.4% Studio Art: 3-D Design 70.1% 10.1% Computer Science A 69.9% 27% Microeconomics 68.4% 22.2% Gov. and Politics - Comparative 66.2% 22.2% Biology 64.6% 7.1% Italian Language and Culture 64.6% 11.8% Psychology 64.4% 20.2% Art History 63.9% 12% Physics 2 63.5% 12.6% Music Theory 63.4% 20.9% Latin 63.1% 13.1% Statistics 59.2% 14.5% European History 58.4% 11.7% Calculus AB 58.3% 18.9% Macroeconomics 57.9% 17.6% World History 56% 8.7% Gov. and Politics - United States 55.2% 12.9% English Language and Composition 55.1% 10.1% Chemistry 54.6% 10.7% United States History 54.3% 12.1% English Literature and Composition 50.1% 6.2% Environmental Science 49.6% 9.5% Human Geography 49.1% 10.7% Physics 1 44.6% 6.2% Source: College Board. For language rates, "Total" includes all students, while "Standard" includes only those students who didn't indicate they speak this language at home or spent more than four weeks studying it abroad. Notice that some of the exams with the highest passing rates, Chinese, Spanish Language, and BC Calculus, are not the easiest AP classes or tests by any estimation. They have high pass rates because the students who take those classes are ones, in general, who have had plenty of prior preparation. This also includes the AP Studio Art Classes- the AP exam is really a portfolio you submit. AP art students put in tons of work during the year preparing pieces for their portfolio. You have to have prior art experience to put together a solid portfolio; you can’t just waltz into AP art as a novice! So what does this mean? If you are strong in a subject, you have a good chance of doing well on the AP exam, even if it has a reputation of being tough. But don't just go by the national passing rates when signing up for classes! On the flip side, note that some of the exams with the lowest passing rates- Environmental Science, US Government, and Human Geography- are not necessarily the hardest AP tests. In fact, at many schools they have a reputation for being easy. So why are their passing rates low? One reason is that many high schools let freshmen and sophomores take these courses since they are comparatively easier. However, since they are many students’ first-ever AP exam, the students can struggle because all AP exams are challenging and tough to pass. Also, students might underestimate these exams and not study enough. Especially if they are taking multiple APs in one year, they might, say, neglect Environmental Science while trying to study for Physics. So even if an AP course has a reputation for being easy, or the class at your school isn’t that hard, do not underestimate the exam. All AP exams are difficult and you have to put in study time to do well on the test. By Reputation, What Are The Easiest AP Exams? We’ve talked about personal strengths, teachers, and passing rates. But you’re probably still wondering: across the board, which AP classes and tests tend to be easy, and which ones are hard? Easiest AP Classes and Tests: Psychology Human Geography Environmental Science US Government Some schools teach US Government as a half-year course since it has less material. Psychology is mostly memorization and only has two free-response questions on the test. (Compare that to AP Chemistry, which has seven.) Environmental Science is conceptually easier to understand than Physics, Biology, or Chemistry for most students. Human Geography centers around learning and applying models, and has less raw memorization required than the AP history exams. Statistics, Computer Science, and Economics (both macro and micro)are often also cited as easier tests if you have background in the subject and/or good teachers. Which APs are often seen as the most difficult? Hardest AP Classes and Tests: English Literature English Language BC Calculus Physics C (both Mechanics and Electricity and Magnetism) Biology Again, this can change if you are strong in any of these subjects and/or your school has a great teacher. You do still have to memorize the structure of the brain, among other things, for AP Psychology. If memorization isn't your strong suit, it might not be so easy. Are AP Language Classes Easy? Finally, we want to address the language AP exams. As we saw above, foreign languages have some of the highest pass rates of all the AP exams. AP Spanish has a pass rate of 89%, AP Chinese's pass rate is 88%, and other languages have similarly high pass rates. Why are their passing rates so high? It’s because students don’t just learn these languages in one year. Most students only take AP language if they have been taking a language for several years. Many students who take the AP language exams even speak that language at home or may have studied abroad. This explains the high passing rates. What this means: if you do have lots of experience with a language, you should definitely try to take the AP language exam. Colleges frequently use AP language scores to place you in first year language courses, or even to excuse the foreign language requirement. In other words, the AP language exams are a great way to show your foreign language skills to colleges- and will be pretty easy to pass as long as you have the experience. But don't sign up for them just because they appear easy based on their passing rates. You can't learn Chinese in a year! What Do Colleges Want? As a final note, you should keep in mind why you are taking AP classes in the first place- to get college credit, and also to strengthen your college applications. In general, colleges want to see two things out of your high school classes: that you are challenging yourself, and that you are developing specific academic interests. If you only take the AP exams with easy reputations, it might look like you’re not challenging yourself. This is especially true if your high school offers the traditionally â€Å"tough† courses like calculus and literature. In other words, don’t load up on a bunch of â€Å"easy† APs just to have them on your transcript. Colleges will see through it. Instead, take APs that are interesting to you and support what you want to study in college. This will often result in a balance between easier and harder exams. For example, a future political science major might take AP US History (challenging) and AP US Government (easier). Or a future environmental engineer might take AP Calculus BC (hard) and Environmental Science (easier). The bottom line? Play to your strengths! Want to get a perfect 5 on your AP exam and an A in class? We can help. PrepScholar Tutors is the world's best tutoring service. We combine world-class expert tutors with our proprietary teaching techniques. Our students have gotten A's on thousands of classes, perfect 5's on AP tests, and ludicrously high SAT Subject Test scores. Whether you need help with science, math, English, social science, or more, we've got you covered. Get better grades today with PrepScholar Tutors. What’s Next? Curious about what the AP tests themselves are like? Learn about how long AP tests are and how to deal with fatigue. Also studying for the SAT? Learn to improve a low math score and how to write a strong essay. Aiming for perfection? Get tips from our resident 1600 full-scorer. Going with the ACT instead? Get tips for the essay and get study tips from our perfect 36 full-scorer. Want to improve your SAT score by 160 points or your ACT score by 4 points?We've written a guide for each test about the top 5 strategies you must be using to have a shot at improving your score. Download it for free now:

Choose one Essay Example | Topics and Well Written Essays - 1000 words - 1

Choose one - Essay Example As I was reading the text, I felt compelled to verify the facts that were presented against my own personal experience of growing up in a major East Coast city. It is always a treat to re-examine my own home town from someone else's perspective. Without a doubt I found Jacobs' poignant assessment of city life was something with which I could strongly identify. Each section of the text highlights a critical aspect of the city that becomes through Jacobs' voice a substantial statement about the inner workings of the urban community. At first glance some of the subject matter might seem peripheral but for the exceptional insight and understanding demonstrated by the author. I didn't know that a man-made landscape could be considered a living organism until Jacobs made the reference to a city being a kind of ecosystem. Everything needs to be balanced and in harmony for all of the occupants to survive in such a fragile place. Nothing makes you think "city" more than the idea of the sidewalk, which is the pedestrian's portion of a city street. Investigating the sidewalk is surely an essential component to gaining an understanding of any urban community. In a crowded city filled with businesses, municipal structures, and parked cars these are just about the only public spaces left for people to spend their time. A safe place to walk is only one of the many functions that the sidewalk fills in a typical city. The sidewalk is like a living conduit that connects all of the separate houses and turns them in to a neighborhood. In a big city, the sidewalks seem to go on and on forever. You could imagine that it would take years to explore all of the streets in even a modest sized community. Like most inner city kids, I spent my entire youth playing on the sidewalk. The streets where I lived were always buzzing with activity. In the mornings many small children marched past my house on the way to the local elemen tary school. Adults strolled to their cars and sped off to work, while the elderly folks tended the garden or simply sat on the stoop socializing. The corner store two doors down from me was another hub of intense movement. Many different people would come and go at slightly different hours of the day, so that there was a constant stream of foot traffic. There were the morning deliveries of newspapers and mail. Maintenance workers and meter readers seemed to visit on a regular basis. Cars carrying tourists who got lost on their way to the airport would occasionally cruise past and stop to have a look. At dusk the teenagers would carouse and mingle. A variety of people used the sidewalk each day for their own purposes, and sometimes those lives would intersect with each other. As Jacobs states, "lowly, unpurposeful and random as they may appear, sidewalk contacts are the small change from which a city's wealth of public life may grow" (95). As I look back I can see that I had lived in a healthy community. There were other neighborhoods that I knew about which were decidedly unhealthy. The local housing projects for example were the places that my friends and I scrupulously avoided. For some reason these tenements were tucked away in a part of the city that was easy to bypass. The

Republican Party Essay Example for Free

Republican Party Essay The Republican Party has always been the true political party of the United States of America. When referring to the Declaration of Independence’s three principles based on John Locke’s and Thomas Jefferson‘s definitions of them. The three principles of the Declaration are the right to life, liberty, and the pursuit of happiness. The Republican Party is superior to the Democratic Party in upholding the Declaration’s principles and biblical God given rights. There are three policies that show that coincide with the prominent Declaration principles that exemplify the dominance of the Republican Party to the Democratic Party. For principle life it is the parties views on abortion, liberty it is the views on gun control, and the pursuit of happiness it is the views on taxes. The principles of life, liberty, and the pursuit of happiness were originally defined by Thomas Jefferson in the Declaration of Independence. Jefferson constructed his definitions from inspirations he received from John Locke‘s writings, primarily from his book Two Treaties. John Locke’s principles slightly differed from the ones in the Declaration and consisted of the principles life, liberty, and property. He called these principles the people’s natural rights, meaning all men are innately born with the right to them. John Locke defines life as God given and that all people are God’s property and entitled to life. Locke defines liberty as â€Å"not a state of license,† but as a rightful and moral exercise of freedom. He states that liberty does not give man the right to take his own life or hinder the liberty of others. A man cannot harm the health, possessions, or life of another man. Locke lastly defines the natural right to property. Locke defines this principle as more than owning things, but also owning oneself. He also defines property as owning the common, the things citizens labor to have. An example of owning then common Locke gives is, if a man catches a fish in the ocean, cooks it and eats it because he labored for it and it was God given. Jefferson based the definitions of life and liberty off of Locke’s definitions in the Declaration of Independence, but changed property and redefined it as the pursuit of happiness. Jefferson defines the pursuit of happiness as mans right to pursue happiness, but not the right to happiness. The Republican party best follows the definition of life according to the Declaration of Independence with their view on abortion. The big difference between the Republican party and the Democratic party on this issue is the Republican party sees abortion as wrong and the Democratic party does not. The republicans are pro-life and conservative and believe that each human being has the right to live and abortion is equivalent to murder. In 2008, approximately one million, twenty-one thousand abortions took place in the U. S. , that’s over one million murders. The Republican Party recognizes that even in the womb the fetus is unique and is a living being with the inalienable right to life and has a creator. The Republican Party as a generalized view believes that human life commences at conception, and therefore has individual and exclusive rights from the mother, which in turn does not give permission to the mother to abort the child. The Democratic Party is the liberal party and is pro-choice in the abortion debate. They believe that being the future mother or it being the women’s body gives her the privilege to make the decision regarding the fetus life. A fair point, but one you never hear is that the government should not try to control what a citizen does with their body, just like it does not tell them what they should eat. Then again, it would be an oxymoron for they do believe in governmental control. The Democratic Party is the party that states that they are the moving forward political party, and they are the ones who manufactured Planned Parenthood, a facility, located across the country, which dedicates their expertise on making a profit on the mistake of, typically, young girls. Planned Parenthood was first opened in 1916 by Margaret Sanger, her sister and a friend. Inauspiciously, she was jailed, but her idea birthed the revelation and a revolution of the movement of women. It gave women the opportunity to fight for not only their body, but for their lives. The Democratic Party, and thus the Federal government have made it very clear that this is an issue worth fighting. Democrats see abortion as a woman’s right to choose what she does with her body neglecting the fetuses right to life. They believe credit the choice of abortion to liberty and since the fetus is inside of the mother she has the liberty to decide what happens. The Republican Party embodies the Declaration of Independence’s absolute right to liberty by their views on gun control. The Republican Party has not only been an advocator of the citizens right to liberty, but also immensely advocates the second amendment. The Second Amendment states, â€Å"A well regulated militia, being necessary to the security of a free state, the right of the people to keep and bear arms, shall not be infringed. † The second amendment was is to firstly, defend us from foreign invaders if our army cannot hold them back and it is necessary if a crisis that large ever occurred for American’s to be able to defend there country. Republicans believe right to own a gun is a law-abiding citizens liberty to exercise their freedom to self-defense or to hunt on legal hunting grounds. Republicans do not support guns for hindering the life or liberty of others, but do respect the peoples right to own one. Republicans â€Å"oppose federal licensing of law-abiding gun owners national gun registration as a violation of the Second Amendment and an invasion of privacy of honest citizens. † The Republican Party defends citizen’s Constitutional right and inalienable right to liberty with their political principles on gun control. The Democratic Party’s view on gun control differs from the Republican viewpoint. Democrats believe the right to bear arms should be severely regulated. Some of the regulations they propose are passing a background check, applying for a permit (which includes having to attend a course teaching on how to handle a weapon), and a copy of the citizen’s mental health record. Democrats believe they are still protecting and acknowledging the Second Amendment, but are by having higher gun control restrictions keeping the guns out of the hands of criminals and terrorists. Democrats believe that strengthening the governments gun control regulations will decrease violence, ignoring that they are infringing on the Declaration of Independence’s inherent right of liberty. The last inalienable right of the Declaration of Independence is the pursuit of happiness. The Republicans best symbolizes this right with their view on taxes. The United States government taxes just about everything, ranging from income taxes to a food taxes to property taxes. The Republican Party believes in only taxing to â€Å"raise money for essential functions. † This means hat Republican believe that the government should spend the citizens tax money only to enforce contracts maintain basic infrastructure and national security, and protect the citizens against criminals. Thus giving American citizens the best chance to pursue happiness. Republicans do not believe the money they get from taxpayers is theirs, but that it is the taxpayers and that it should be invested in a way that is best for them and benefits their futures the most. They strongly believe in keeping taxes low for all citizens. The Republicans are trying to enforce a tax system to help boost the economy called Tax Relief. This program will reduce the taxes for all businesses primarily small businesses to make it easier for the businesses to grow. If this were to happen it would provide many Americans with jobs. Another thing Republicans do to help Americans easier pursue happiness with their beliefs on taxes is they seek to limit the income tax so citizens can save more money, choose easier what they spend their money on, or invest in something. The Democratic position is not like the Republican Party’s and does not represent the inalienable right to the pursuit of happiness. Democrats aim to raise taxes for government funding that they believe will turn into businesses. They wish to cut taxes for the middle class and increase them upon the wealthy. The wealthy class is considered the top one percent income earners. Contrary to the Republican Party the Democrats believes that you feed in the money with the poor, so rather than giving taxes breaks to the rich, you offer the poor money to go to school, get out of their situation, find a job and move their family in a better home. Citizens will find that the Democratic Party demands many tax increases especially on people who make more than a million dollars a year, also called the one percent. The common argument regarding tax increases, that rich people never pay taxes and regardless of the number they never lose a dime. And that all it does it put more paper in the system making the revenue of the United States of America augment. The Republican party does not only follow the inalienable rights better as they are defined in the Declaration of Independence, but they also follow them better as God given rights. God is the one who gave people the right to life, liberty, and happiness. The Republican views best coincide with the Biblical views of the inalienable rights stated in the Declaration of Independence. The verse Jeremiah 1:4-5 best amplifies the Lord’s view on abortion. It says â€Å"Then the word of the Lord came to me, saying: â€Å"Before I formed you in the womb I knew you; before you were born I sanctified you; I ordained you a prophet to the nations. † This means that the Lord knew everyone before they were born and created him or her each uniquely. Americans are all God’s children and since He knew them before they were born that means taking one of their lives would be murder. Verse Exodus 20:13 says, â€Å"Thou shalt not kill. † Therefore the Republican Party and their position against abortion best follow God’s will of life. The next God given right or inalienable that the Republican Party best represents is liberty. Part of the definition of the indisputable right to liberty is that you may not interfere with or hinder the liberty of another person. The Bible verse that demonstrates the respecting of others liberty is Leviticus 19:18 â€Å"Do not seek revenge or bear a grudge against one of your people, but love your neighbor as yourself. I am the Lord. † The Republicans represent this with their view on again gun control. The Republicans do not allow gun usage for the misconduct or injury of others. The last God given right is the right to the pursuit of happiness. The Bible verse Ecclesiates 5:19 best demonstrates that God wanted His creations to be happy and pursue it. The verse says, â€Å"Moreover, when God gives any man wealth and possessions, and enables him to enjoy them, to accept His work—this is a gift of God. † This verse goes along directly with Thomas Jefferson’s definition of the pursuit of happiness. God gave all humans the ability to be happy, but it is their job to pursue it and achieve it. The Republican principle that best goes along with the Biblical view of the pursuit of happiness is taxes because Republicans do their best to use the taxpayer’s money to benefit them. They also try to take as little from people as they can. Based on the Declaration of Independence’s and God given inalienable rights, the Republican Party is the true political party of the United States. The Republican Party best simulates the definitions given by John Locke and Thomas Jefferson for the principles of life, liberty, and the pursuit of happiness. They demonstrate this by their political standpoints on the controversial issues of abortion, gun control, and taxes.

The Apprenticeship of Duddy Kravitz :: essays research papers

Question #3: Duddy hides his insecurities from himself and others. He is afraid to ask his father if his mother had liked him. What does this reveal about Duddy? Why do we often hide our fears? Two thousand years ago, Jesus had said,"Man does not live by bread alone." This is true, for other than physiological needs, man also has other basic necessities. As outlined in an article written by Professor A. H. Maslow called "A Theory of Human Motivation", these basic necessities include a person’s desire for security, love, esteem and self-actualization. Thus, when Duddy hides his fears from others and himself, he is only pursuing a sense of safety, which is one of the human fundamental needs. A person’s self-projected image is very important. We often hide our own fears because we do not want to acknowledge our dreads. We are afraid that if we show our dreads, our images as great persons will be ruined. People want to feel important, significant and superior; people do not want to feel inferior, subordinate and insignificant. We are afraid that if we concede our fears, others will dismiss us as unimportant. This is even more true for an ambitious young man like Duddy. He springs from humble beginnings, but clearly, he is very eager to become a successful and powerful man. "...his bony cheeks were criss-crossed with scratches as he shaved twice daily in his attempt to encourage a beard." This clearly indicates to the readers that Duddy wants and tries to be someone that he is not. He wants himself and others to think that he is of great significance. The fact that his friends, family and others reject him make his self-projected image even more preponderan t. He must convince himself and others that he is a very important figure and he does this by denying his insecurities. Duddy is not a very well-liked figure in the novel. He arouses readers’ sympathy because his family and friends do not appreciate him. There is much evidence of this throughout the novel. Perhaps the best illustration of this is when Duddy returns from St. Agathe with six expensive sport shirts for Max as a gift, but only to find out that his father is not interested in the gift. Duddy is not loved in his family, yet he needs love desperately. Since his father, uncle and brother do not love him, his desire for love is projected onto his dead mother. The Apprenticeship of Duddy Kravitz :: essays research papers Question #3: Duddy hides his insecurities from himself and others. He is afraid to ask his father if his mother had liked him. What does this reveal about Duddy? Why do we often hide our fears? Two thousand years ago, Jesus had said,"Man does not live by bread alone." This is true, for other than physiological needs, man also has other basic necessities. As outlined in an article written by Professor A. H. Maslow called "A Theory of Human Motivation", these basic necessities include a person’s desire for security, love, esteem and self-actualization. Thus, when Duddy hides his fears from others and himself, he is only pursuing a sense of safety, which is one of the human fundamental needs. A person’s self-projected image is very important. We often hide our own fears because we do not want to acknowledge our dreads. We are afraid that if we show our dreads, our images as great persons will be ruined. People want to feel important, significant and superior; people do not want to feel inferior, subordinate and insignificant. We are afraid that if we concede our fears, others will dismiss us as unimportant. This is even more true for an ambitious young man like Duddy. He springs from humble beginnings, but clearly, he is very eager to become a successful and powerful man. "...his bony cheeks were criss-crossed with scratches as he shaved twice daily in his attempt to encourage a beard." This clearly indicates to the readers that Duddy wants and tries to be someone that he is not. He wants himself and others to think that he is of great significance. The fact that his friends, family and others reject him make his self-projected image even more preponderan t. He must convince himself and others that he is a very important figure and he does this by denying his insecurities. Duddy is not a very well-liked figure in the novel. He arouses readers’ sympathy because his family and friends do not appreciate him. There is much evidence of this throughout the novel. Perhaps the best illustration of this is when Duddy returns from St. Agathe with six expensive sport shirts for Max as a gift, but only to find out that his father is not interested in the gift. Duddy is not loved in his family, yet he needs love desperately. Since his father, uncle and brother do not love him, his desire for love is projected onto his dead mother.

Aerofoil Design Xflr5

Aashiq Zakir Hussain12108227 | Supervisor : | Dr. Patrick Frawley | Submission : Date | 26th October 2012 | ABSTRACT Airfoil is the main part of the airplane which contributes the lift required by the airplane to fly in the air. By varying the wing’s area and the angle of attack, different lift can be created and can be used to fly the airplane. This program named XFLR5 is used for determining the airfoil characteristics.It will help them to save a lot of time on computing the equations and on the trial and error method. The program can also be used as basic tool to show the users what will happen when some variables like Reynolds number, the AOA of the wings and the speed of the aircraft are changed and how it will affect the results and lift generated. This project report deals with the analysis of widely used airfoils in the modern aircrafts. In this analysis, the lift, drag, pressure profiles and their coefficients of the airfoils are been calculated using xflr5 program.Th ese are obtained in the form of graphical representation by feeding data such as Reynolds number, Mach number, Angle of Attack and dimensions of the airfoils to the program. The results such as maximum lift coefficient, stalling angle, maximum lift to drag ratio and such parameters are obtained and are been compared with each other.Re| Reynolds number| -| ?| Angle of Attack| -| M| Mach number| -| Cp | Pressure Coefficient| -| Cl| Lift Coefficient| -| Cd| Drag Coefficient| -| Cl / Cd| Glide Ratio| -| T| Thickness| mm| c| Chord| -| INTRODUCTION Airfoils are the primary shapes which allow streamlined flow over it when it is driven through air. These shapes do not produce much drag compared to other shapes as so it is used in all aircraft structural parts which is subjected to airflow. Basically airfoils can be divided into many types by slightly varying their thickness, length, camber area and so on without after the shape.In this analysis we deal with airfoil shapes known as NACA airf oils. The  NACA airfoils  are just  shapes of airfoils used for aircraft wings, which is developed by the  National Advisory Committee for Aeronautics  (NACA). The shape of the NACA airfoils is determined using a  series  of digits followed by the word â€Å"NACA. † The series is divided using digits from 1-8. We only deal with the 4-digit series of airfoils in this analysis. The 4 digit airfoils we are going to discuss in this analysis are 0004, 0008, 0012, 0016, 0020, 0312, 1312, 2312, 3312, 2112, 2512 and 2712.In this 4 digit series, 1st digit denotes the maximum  camber  as percentage of the  chord, 2nd digit denotes the distance of maximum camber from the airfoil leading edge in tens of percent's of the chord and this last 3rd and 4th digits denotes  maximum thickness of the airfoil as percent of the chord. The key features we are going to discuss about in this analysis are the effects of Angle of Attack, Reynolds number, Mach number, Camber and Thi ckness. The basic aerodynamic design is to obtain maximum lift and minimum drag which will be expressed in terms of coefficient of lift (Cl) and coefficient of drag (Cd).Using this program known as XFLR5, we are going to compare the characteristics of all the airfoils. As the operating valves such as Angle of Attack, Mach number, Reynolds number are to be fed in to the program and this will give us the required graph of the parameters such as Cl, Cd, alpha, Cp and so on. Using these results achieved from the program, it will be easier to find out the airfoil with highest Cl at various angles of attack, which has got highest stalling angle and the airfoil with best glide ratio and so on. OBJECTIVESThis report is basically done to find out airfoils with maximum lift to drag ratio by comparing many airfoils each other and allowing their camber area, thickness and the location of the camber to deviate to the small percentage of the chord. By doing this, we can achieve a best airfoil des ign that can be used in live aircrafts. LITERATURE REVIEW Introduction: * If an aircraft has to fly, force has to be counter balanced by the weight as it must be opposite to its magnitude. This force is known as lift. Lift plays a major factor on the airplane flight.The main plane (wings) generates more lift as it is the important load carrying member. * The aerofoil sections have been started to get developed in late 1800’s. In 1884 H. F. Phillips with the help of wind tunnel, tested and made series of airfoils. At the same time Otto Lilienthal with the help of the bird’s wings, designed airfoil shapes. It was found that the key factor is that the wing curvature or camber. The early airplanes were biplanes because, the airfoils were thin and cambered as shown in figure 2. 1. Figure 2. 1: Hanson http://www. biplanefun. om/assets/Image/Hanson_215217_001. jpg Nowadays these types of aircrafts are not used, as all airfoils are made by trial and error method. Airfoils used in 1920’s (NACA). ( http://www. desktop. aero/appliedaero/airfoils1/images/sections1. gif) Figure 2. 2: Ancient development in airfoils For the project, the NACA 4 digit airfoil format will be use for the program which is generating the airfoil’s shape and the thin airfoil theory will be use for computing the important parameters of the wing. * 1. ii Terminology for Airfoil and Airplane:Basic parts of an airfoil that must be known before getting in to the chapter of NACA 4 digit series. The diagram below describes the parts of an airfoil from which series are determined. Figure 2. 3: Airfoil Terminology airfoil (http://www. copters. com/aero/pictures/Fig_2-10. gif) Figure 2. 5: Plane Axes (http://www. allstar. fiu. edu/aero/images/fig25. gif) 1. iii Definitions: The line drawn midway between the upper and lower surfaces of the airfoil is known as mean camber.The straight line joining the leading and trailing edges of the airfoil is known as chord. Leading edge is the front of the airfoil. Trailing edge is the end of the airfoil. The angle between the chord and the line representing the relative airflow is known as the angle of attack (AOA). Camber of an airfoil is the upper and lower surfaces curvature. The airfoil’s thickness and amount of lift the airfoil will generate is determined by the cambered area. When the term upper camber is used, it is referring to the upper surface of the airfoil. When the term lower camber is used, it is referring to the lower surface of the airfoil.Span is the distance from a tip of the wing to the other tip of the wing. * 1. iv The Four Forces on the Airplane Figure 2. 6: Forces on an airplane (http://anjungsainssmkss. files. wordpress. com/2011/09/plane_forces. jpg) * The four main forces that maintain the aircraft in steady flight and helps fly are Lift, Drag, Weight and Thrust. Thrust is a forward pulling which is generated by the engine(powerplant). Thrust opposes the drag. Thrust depends upon the powe r of the engine as high power engines produce more thrust and the type of the engines with respect to their mounted location.Drag is a force which opposes the thrust as when the aircraft moves in high speed the air passes over and below the surface produce drag. It is a resistive force. The weight is a force of an airplane which is acting downwards due to the force of gravity. This force pulls down on the plane and opposes the lift force. This force mainly depends upon the weight of the aircraft and so it depends upon how much we load and the total weight we use to build the aircraft. Lift is an important force in the aircraft which tends the aircraft to fly.It is generated as aircraft moves at high speed and is generated below the airfoil surface of the main plane. At this time, there will be low pressure acting over the wing and high pressure under the wing. The four forces act on any airplanes in flight and are interconnected. In order for the airplane to take off, lift must over come weight and thrust must overcome drag. During landing, thrust must be reduced below the level of drag and lift must be reduced below the weight of the airplane. * * * 1. v Theory of Lift: * Lift is an important force as it sustains an airplane in ir and enables it to manoeuvre. The theory of lift has been debated for a long time and currently still debating. However this project is not about debating the theory of lift but to design the airfoil. Therefore to cover the theory of lift, the 2 more popular explanations which are the Newton’s Law and the Bernoulli’s Principle will be discuss briefly. * Principles of Physics such as the principle of conservation of momentum, the principle of the conservation of mass and the principle of the conservation of energy are the basic principles to be known and to be considered to understand lift force.The principle of the conservation of momentum is covered by Newton’s Law. And the principle of the conservation of energy is covered Bernoulli Principles. Both can be use to explain the basics principles on how lift is form and are compatible with each other. In the following explanations, air is assumed as an ideal fluid and therefore 3 major assumptions about the physical properties of the airflow are made: * The airflow over a wing is incompressible. The airflow is inviscid which means the viscosity of air is approaching zero. The airflow around the wing is steady. * * * 1. vi Newton’s Law Explanation: Lift is generated by a wing as it moves through the air at an angle of attack. This will turn the airflow downward and the wing itself will have the force acting in an upward direction. In order to make use of the Newton’s Law, we need to know a theory known as the Coanda Effect. Coanda Effect stated â€Å"A moving stream of fluid in contact with a curved surface will tend to follow the curvature of the surface rather than continue travelling in a straight line. † This states tha t, when the air hits the wing when it is subjected through air, the angle changes the wing dimension as it is tilted to an extent.At this stage air do not reflect back as it stays over the wing. From Coanda Effect, we know that the wing is changing the direction of the airflow and also changing the velocity. Since lift is a force, according to Newton’s 2nd law of motion: * Force = mass x acceleration (F=ma) * Acceleration is a change in velocity with respect to time and force will be: * Force = mass x (change in velocity / change in time) * Therefore a change in velocity will generate a force and a force will cause a change in velocity.Velocity has both a magnitude called speed and a direction is associated with it. It is a vector quantity. Therefore by changing the direction of the airflow, the wing is also causing an increase in velocity which results in an acceleration. This change in velocity also generates a reaction force on the wing acting in an upwards direction. * Th is principle of Newton’s 3rd law which states â€Å"Every action has an equal and opposite reaction† helps to explain the nature of lift. The reaction force experienced by the wing is the total reaction. Figure 2. : Forces on an airfoil (http://www. free-online-private-pilot-ground-school. com/images/forces_airfoil. gif) * 1. vii Bernoulli’s Principle: Bernoulli’s Principle can be referred to as the law of conservation of energy and the total energy in a moving mass of fluid consists of potential energy, kinetic energy and the fluid’s pressure energy. It states that sum of all energies result in a constant value for the steady flow of an ideal fluid. Bernoulli’s Principle shows that as the velocity of a fluid flow changes, the pressure will change as well.This means that when the fluid’s velocity increases, the pressure will decrease and vice versa. Using this principle of pressure variation with velocity change, lift force developed by the wing can be accurately predicted in the same way as Newton’s Law. Figure 2. 8: Example of Bernoulli’s Principle (http://images. rcuniverse. com/magazine/reviews/455/bernoulli. jpg) Using Bernoulli’s Principle, the kinetic energy of the air will be highest where the pressure energy is the lowest and lowest where the pressure energy is the highest.This will result in an increase of the airflow for the upper surface of the wing and decreases for the lower surface of the wing. Therefore there will be a lower pressure on the upper surface of the wing and a higher pressure on the lower surface of the wing. This will result in a force acting in an upwards direction. Using equation: Force = Pressure x Area The lift force will be proportional to the pressure differential across the wing multiplied by the wing’s surface area. For Bernoulli’s Principle, it does not provide any explanation on why the airflow is faster on the top surface of the wing.The Newton’s Law also did not explain why the air deflects downward. Both theories only explain how lift is created. * 1. viiiThe Factors affecting Lift: Lift is the main source of force which enables the airplanes to fly. In order to generate enough lift, several factors have to be taken into consideration as they affect the amount of lift the airplane can generate. The general equation for lift is Lift = lift coefficient x {(air density x velocity2)/2} x wing area Where the lift coefficient is given by: Lift coefficient = 2 x pi x (AOA – calculated AOA at zero lift) Therefore the factors affecting lift are: The Angle of Attack (AOA). * The airfoil shape. * Airspeed. * Wing size. * Air density. The air density depends on the height which the airplane is flying. As the height of the airplane decreases, the air density will increase which will also result in higher lift generated. Therefore to generate the same amount of lift when the air density increases, the velocity of the airplane must increase. The Angle of Attack (AOA) of the airplane’s wing which is denoted by the Greek letter alpha ?. AOA is the angle between the oncoming air or relative wind and a reference line on the wing which in this case is the chord.It is one of the important parameters for handling and designing of a plane as a typical wing only has a limited range of angles of attack As the AOA increases, the lift generated by the airfoil is also increased. However, once the AOA reaches a certain angle known as the Critical Angle, the airplane will stall as the airflow will separate from the upper surface, resulting in a loss of lift which means the airplane will stall. This will result in cavitations and lose in lift force. It will also produce drag force as shown in figure 2. 9. Figure 2. 9: Diagram of how AOA affects the air flow (http://www. ero-mechanic. com/wp-content/uploads/2008/12/2-8-283Ãâ€"300. jpg) The lift depends upon the airfoil and the force the air flows over it. Thus when airflow is more, lift produced is maximum. Comparing a cambered airfoil and a symmetric airfoil, a cambered airfoil produced more lift than a symmetric airfoil. Even a flat plate subjected to the air will produce lift. Thus the airfoil should be designed in such a way that it produces high lift to drag ratio. * 1. ix NACA 4 series: In the 1930s, the National Advisory Committee for Aeronautics (NACA) developed several sets of airfoils and camber lines.The â€Å"Characteristics of 78 Related Airfoil Sections from Tests in the Variable Density Wind Tunnel† report was published by the NACA. In this report, the authors discovered that the airfoils that are successful had many similarities. The two primary variables that affected the airfoil shapes are the slope of the airfoil mean camber line and the thickness distribution above and below the line. Many of this airfoil shapes have been in use as tails and wings of airplanes over the years. The first family of airfoi ls designed using this approached is the NACA 4 series.In the NACA 4 series, the 1st digit indicates the maximum camber (m) in percentage of the chord, the 2nd digit indicates the position of the maximum camber (p) in tenths of cord and the last 2 digits provide the maximum thickness (t) of the airfoil in percentage of chord. For example, the NACA 2412 airfoil will have a maximum camber of 2% located at 40% from the leading edge with maximum thickness of 12% cord. 4-digit series airfoils by default have a maximum thickness of 30% of the chord from the leading edge. Therefore with the first 2 digits 00, it indicates that there is no camber and is a symmetrical airfoil.To find the mean camber line, it can be calculated using: To calculate for the thickness distribution, equation 2. 3 is used. Currently in the market, there are several NACA 4 series airfoil generators. These generators calculate the coordinates of the airfoil shape. However, it does not take into consideration of the l oad that the airfoil will be taking, meaning the surface area of the wings are not taking into consideration. There is also not much program which enables the user to calculate the whole wing surface area and the lift generated by the wing with different airfoil design. 1. x Thin Airfoil Theory: For this project, the Thin Airfoil Theory will be use to compute the model airplane’s airfoil thickness and wing dimension as the thickness for the model airplane’s wing is not very thick. Thin airfoil theory was devised by German mathematician Max Munk and further refined by British aerodynamicist Hermann Glauert and others in 1920s. It is a simple theory of airfoils that relates the angle of attack to lift. The theory idealizes the flow around an airfoil as a 2 dimensional flow around a thin airfoil.At low angles of incidence, the boundary layer growth on an airfoil is thin and remains attached to the airfoil. Therefore the airflow is assumed to be inviscid and irrotational. Since the thickness of any lifting airfoil is less than a fifth of its chord length, the effect of the airfoil’s thickness can be neglected and the airfoil will be represented by its mean camber line. A mathematically conceived function in the form of a vortex sheet is then placed along the length of the camber line to simulate the airfoil. This essentially makes it a streamline of the flow.By applying the circulation theory of lift to this streamline, the aerodynamic properties of the airfoils are obtained. The airfoil is considered as having zero thickness and infinite wingspan. This the reason why the theory does not take into consideration the induced drag that arises from the wing tips of an airfoil. Therefore it is only good for approximating an airfoil with medium and large aspect ratio and only up to the stall angle which is usually 10 to 15 degree for typical airplane configuration. Any angle beyond 15 degree, the thin airfoil theory cannot be used to calculate the c oefficient of lift.Thin airfoil theory is important as it provided a theoretical basis for the important properties of the airfoils in 2 dimensional flows: * The centre of pressure lies exactly ? of the chord behind the leading edge on a symmetric airfoil. * The aerodynamic centre lies exactly ? of the chord behind the leading edge for cambered airfoil. * The slope of the lift coefficient versus angle of attack line is 2? units per radian. There are many formulae that states the derivation of the thon airfoil theory, but we don’t require those for our project and so its neglected. xi Flat Plate Airfoil Theory:Flat plate theory is applied to airfoils as the thickness is also the constituent of drag in the airfoil. The flat plate when it is subjected to airflow the drag minimum as compared to the other shapes with reasonable thickness. Thickness cannot be neglected as it also plays a vital role in the camber surface as it produces lift. The transition point can be pushed back a s we reduce the drag in an airfoil by which we can get a good lift curve for higher degrees. In case of boundary layer, the drag in a flat plate will be laminar for a certain period of time and it then become turbulent.There is no unique valve where the stream gets turbulent, but by keeping the laminar surface clean and free stream, one can delay the renolds number. Figure 2. 10: Velocity profiles for laminar and turbulent boundary layer EXPERIMENTAL PROCEDURE AND ANALYSIS Introduction: These experiments below are done using xflr5 program. NACA 4 digit series airfoils are been used in the analysis. In the final analysis, NACA airfoils ranging from 0 to 9% of camber magnitude, 10 to 70% of camber location and 3% to 30% of thickness airfoils are analysed to get an airfoil of better performance with high to lift to drag ratio.Exercise A: Effect of Angle of Attack Airfoil = NACA 0012 Re number = 1000000 M = 0. 00 Part 1: In this part, the pressure profiles for different angle of attack are to be discussed. AOA( Alpha ) : -4 to 16 degrees with a step of 4 degrees Figure 3. 1: Pressure profiles plot of NACA 0012 Angle of attack(alpha)| Cl| Cd| -4| -0. 429| 0. 007| 0| -0. 00| 0. 005| 4| 0. 429| 0. 007| 8| 0. 910| 0. 012| 12| 1. 242| 0. 020| 16| 1. 301| 0. 050| Part 2: In this part we discuss about the lift, drag and their coefficients. Angle of Attack (alpha) = -4 to 18 degrees with a step of 0. degrees Figure 3. 2: Drag coefficient and Angle of attack plot Figure 3. 3: Lift coefficient and Angle of attack plot Figure 3. 4: Glide ratio and Angle of attack plot Figure 3. 5: Lift coefficient and Drag coefficient plot Analysis: Part 1: In this part, the angle of attack is changed from -4 degrees to 16 degrees with fixed Reynolds number and Mach number. The pressure profiles seem to have gradual increase in both negative and positive values on Cp. As the angle of attack increases, the lift and drag increases to a certain limit and stalls.Maximum lift is at 14 degrees and thus stall occurs. Cl max is 1. 36. It is consistent as Bernoulli’s approach on analysis. Part 2: In this part, the angle of attack is varied from -4 degrees to 18 degrees. Re and M is same as above. The lift curve passes through the origin, so zero lift is at origin (0 degrees). Max Cl is at 1. 36 where the stall angle is at 4 degrees. The maximum glide ratio is 75. 86 and at this point the values of Cl is 0. 8685, value of Cd is 0. 0115 and the value of alpha is 7. 5 degrees. Exercise B: Effect of Reynolds number Airfoil = NACA 0012 Alpha (AOA) = 4 degrees M = 0. 00Part 1: In this part, we discuss about the effects due to change in Reynolds number in NACA 0012 airfoil. Re number = 100000 to 2. 1 million with an increment of 400000 Figure 3. 6: Pressure profiles plot Part 2: In this part, we discuss about the effects due to change in Reynolds number and Angle of attack in NACA 0012 airfoil. Re number = 100000, 500000, 900000, 2100000, 4000000. AOA (alpha) = -4 to 20 degrees with a step of 0. 5 degrees. Figure 3. 7: Glide ratio and alpha plot Figure 3. 8: Drag coefficient and alpha plot Figure 3. 9: Lift coefficient and alpha plot Figure 3. 10: Lift and Drag polarRe number| Max Cl| Stall angle(degrees)| Max Cl/Cd| Cl at Max Cl/Cd| Cd at Max Cl/Cd| Alpha at Max Cl/Cd| 100000| 0. 97| 10. 5| 36. 5| 0. 61| 0. 017| 5 degrees| 500000| 1. 21| 13. 5| 61. 9| 0. 72| 0. 012| 6 degrees| 900000| 1. 35| 14. 5| 73. 6| 0. 86| 0. 011| 7. 5 degrees| 2100000| 1. 57| 17| 92. 5| 0. 97| 0. 0105| 8. 5 degrees| 4000000| 1. 67| 18. 5| 107. 3| 1. 073| 0. 010| 9. 5 degrees| Analysis: Part 1: In this case there is an increase in the pressure values as increase in Re number and the transition is point is pushed backwards in the curve with Reynolds number 4000000 than the curves with Reynolds number less than that.Part 2: In this case, the transition point is brought backwards as there is an increase in the boundary layer. It just pushes the stall angle further towards the leading edge. For Re= 100000, drag is increased more at high angle of attack. For high Re number, lift coefficient is more than low Re number and the drag is minimised at high angle of attack in high Re number curves. Exercise C: Effect of Mach number Airfoil = NACA 0012 Re number = 2 million Part 1: In this part, we are discussing about the effects in forces due to change in Mach number. Alpha (AOA) = 4 degrees M = 0. 00, 0. 1, 0. 02, 0. 03 Figure 3. 11: Pressure plot of M=0. 00 Figure 3. 12: Pressure plot of M=0. 01 Figure 3. 13: Pressure plot of M=0. 2 Figure 3. 14: Pressure plot of M=0. 3 Part 2: In this part, we are going to see the difference in the curves for different Mach numbers mentioned in part 1 and also with Angle of attacks from -4 to 30 degrees with a step of 0. 5 degrees. Figure 3. 15: Lift coefficient and Alpha Figure 3. 16: Drag coefficient and Alpha Figure 3. 17: Glide ratio and Alpha Figure 3. 8: Lift and Drag polar M| Cl Max| Stall angle(degrees)| Cl/Cd Max| Cl at Cl/C d Max| Cd at Cl/Cd Max| Alpha at Cl/Cd Max| 0. 0| 1. 560| 17| 91. 5| 0. 975| 0. 0104| 8. 5 degrees| 0. 1| 1. 540| 16. 5| 91. 25| 0. 985| 0. 0105| 8. 5 degrees| 0. 2| 1. 475| 15. 5| 90. 3| 1. 00| 0. 0115| 8. 5 degrees| 0. 3| 1. 355| 73| 88. 4| 0. 97| 0. 0110| 8 degrees| Analysis: Part 1: In this analysis, there is a change in pressure (Cp). As the Mach number increases, the value of Cp increases in the negative values. Due to the increase in speed, the transition point in moved towards the leading edge and stall angle decreases.Part 2: In this part, the angle of attack is also changed with the Mach number. We can see the effect of lift and drag from the values in the table given above in part 2. At the highest AOA the Cl value is increased. As the Mach number increases, the value of Cl max and the stalling angle drops down as it tends to stall soon in high ach number. Exercise D: Effect of Thickness In this exercise, various airfoils of different thickness are used. The values are ta ken from the program and compared with each other. Re = 2000000, M = 0. 00, AOA(alpha) = -4 to 20 degrees with a step of 0. Airfoils = NACA 0004, NACA 0008, NACA 0012, NACA 0016, NACA 0020 Figure 3. 19: Drag coefficient and Alpha plot Figure 3. 20: Glide ratio and Alpha plotFigure 3. 21: Lift coefficients and Drag coefficient plot Figure 3. 22: Lift coefficient and Alpha plot NACA airfoils| Max Cl| Stalling angle(degrees)| Max Cl/Cd| Cl at Max Cl/Cd| Cd at Max Cl/Cd| Alpha at Max Cl/Cd| 0004| 0. 96| 20| 48. 1| 0. 325| 0. 007| 3 degrees| 0008| 1. 15| 11. 5| 79. 85| 0. 775| 0. 010| 7 degrees| 0012| 1. 563| 17| 91. 52| 0. 977| 0. 010| 8. 5 degrees| 0016| 1. 578| 18| 93. 10| 1. 228| 0. 013| 11 degrees| 0020| 1. 45| 18. 5| 92. 4| 1. 000| 0. 010| 9. 5 degrees| Analysis: Due to the thickness, there is a change in lift as it can be observed in figure 3. 13. As NACA 0004 is thin, it stalls soon. But NACA 0020 and NACA 0016 airfoils has high value of Cl and this attains at almost 18 degrees o f AOA. From this it can be said that, if thickness increases the lift increases, but its for certain limit as Cl max drops in NACA 0020. The curves given above for each airfoil cannot be believed till end. This is only applicable theoretically that if an airfoil begins to stall, it can regain its lift after some angle further.In practical application, it is false. The curves can be believed till the first major stall occurs which attains Cl max. Exercise E: Effect of camber, magnitude In this exercise, the airfoils of different camber are been discussed i. e. the first digit of the NACA 4 digit series is been changed and compared. Re number = 2000000, M = 0. 00, AOA (alpha) = -4 to 20 degrees with a step of 0. 5 degrees Airfoils = NACA 0012, NACA 0312, NACA 1312, NACA 2312, NACA 3312 Figure 3. 23: Glide ratio and Alpha plot Figure 3. 23: Drag coefficient and Alpha plot Figure 3. 24: Lift coefficient and Alpha plot Figure 3. 5: Lift and Drag coefficients plot NACA Airfoils| Max Cl| S talling angle(degrees)| Max Cl/Cd| Cl at Max Cl/Cd| Cd atMax Cl/Cd| Alpha at Max Cl/Cd| Zero Lift| 0012| 1. 546| 17| 91. 5| 0. 955| 0. 0105| 8. 5degrees| 0 degree| 0312| 1. 546| 17| 91. 5| 0. 955| 0. 0105| 8. 5degrees| 0degree| 1312| 1. 610| 17| 98. 4| 0. 901| 0. 0094| 7 degrees| -1degree| 2312| 1. 664| 17| 122. 3| 0. 865| 0. 0071| 5. 5degrees| -2degree| 3312| 1. 712| 16. 5| 140. 5| 1. 008| 0. 0072| 6 degrees| -3degree| Analysis: As the magnitude of the camber is changed, the lift is attained way before than a normal airfoil with less camber surface.Symmetrical airfoil is that in which upper and lower surface are same and asymmetrical has various shapes in it. In these two types, the symmetrical airfoil produces less lift-drag ratio than asymmetrical airfoils. Due to the camber in the airfoil, in NACA 1312, NACA 2312 and NACA 3312 has started producing lift at negative angles as other two produces only after 0 degrees. Hence the lift is acquired soon and as angle increases, the drag produced is also less than in airfoils NACA 0012 and NACA 0312. Exercise F: Effect of camber, locationIn this exercise, we change the location of the camber and analyse their changes in curves. Re number = 2000000, M = 0. 00, AOA (alpha) = -4 to 20 with a step of 0. 5 degrees Airfoils = NACA 0012, NACA 2112, NACA 2312, NACA 2512, NACA 2712 Figure 3. 26: Drag coefficient and Alpha plot Figure 3. 27: Lift coefficient and Alpha plot Figure 3. 28: Glide ratio and Alpha plot Figure 3. 29: Lift coefficient and Drag coefficient plot NACA Airfoils| Max Cl| Stall angle(degrees)| Max CL/Cd| Cl at Max Cl/Cd| Cd at Max Cl/Cd| Alpha at MaxCL/Cd| Zero lift(degrees)| 0012| 1. 563| 17| 91. 5| 0. 55| 0. 0103| 8. 5degrees| 0| 2112| 1. 726| 17| 117. 0| 1. 145| 0. 0128| 12degrees| -1. 85| 2312| 1. 675| 17| 122. 3| 0. 865| 0. 0072| 5. 5degrees| -2. 02| 2512| 1. 694| 17| 111. 0| 0. 769| 0. 0068| 4. 5degrees| -2. 37| 2712| 1. 741| 17| 102. 5| 0. 962| 0. 0093| 6 degrees| -3. 056| Analysis: In this analysi s, the location of the camber is changed in each airfoil and hence so, we can find the change in Cl max and glide ratio which are key factors here. Fluctuation in the glide ratio can be seen, as it increases in NACA 2312 and decreases when going further increase in camber location.There are minor deflections in the stalling angle as that cannot be accurately calculated. Thus changing the camber location increases lift to some extend as further increase in camber value may cause drag. Exercise G: Finding the best values of a NACA airfoils In this section of analysis, we are using the airfoils of wide range with about 0-9%c camber magnitude, with 10-70%c of camber location and with 3-30% thickness range. We are yet to find the best airfoil with Cl max, largest stalling angle and Cl/Cd(Glide ratio). Re = 2000000, M = 0. 00, AOA(alpha) = -4 to 20 degrees with a step of 0. degrees. Graphs: Figure 3. 30: Lift coefficient and Alpha plot Figure 3. 31: Glide ratio and Alpha plot Figure 3. 32 : Glide ratio and Alpha(Re= 200000) Analysis: From the graph 3. 30, we can figure out the maximum Cl value is given by NACA 9318 of about 2. 3. And maximum Cl value when alpha(AOA) is 0 is given by NACA 9718 as per the figure. And hence the airfoil with largest stalling angle also can be seen, as it is NACA 9718. This airfoil though it has less Cl max, it stalls late compared to other airfoils. Its stall angle is going more than 20 degrees.

Boot Camps and Juvenile Crime Essay - 1148 Words

Boot Camps and Juvenile Crime Five years ago, responding to an increase in serious juvenile crime, the state of Maryland initiated one of the nations largest boot camp programs for teenage criminals. The program, called the Leadership Challenge, quickly became the model for other states. But last week, after reviewing a task force report that documented instances of physical abuse at their camps, Maryland officials appeared on the verge of conceding that the current initiative was a failure. Military-style discipline may work as punishment at juvenile boot camps, but it has not been effective as rehabilitation. The Maryland experience, together with problems in other states, has already led some states to close their boot camps†¦show more content†¦It was in this atmosphere that Lt. Gov. Kathleen Kennedy Townsend of Maryland began exploring the potential of boot camps. Shortly after being elected with Gov. Parris N. 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