1. * 5651 Sayılı Kanun'a göre TÜM ÜYELERİMİZ yaptıkları paylaşımlardan sorumludur.
    * Telif hakkına konu olan eserlerin yasal olmayan şekilde paylaşıldığını ve yasal haklarının çiğnendiğini düşünen hak sahiplerinin İLETİŞİM bölümünden bize ulaşmaları durumunda ilgili şikayet incelenip gereği 1 (bir) hafta içinde gereği yapılacaktır.
    E-posta adresimiz

İngilizce Makaleler

Konusu 'Yabancı Dil Eğitimi-The Foreign Language Education' forumundadır ve dderya tarafından 6 Mayıs 2014 başlatılmıştır.

  1. dderya
    Ayyaş

    dderya kOkOşŞ Süper Moderatör

    Katılım:
    29 Temmuz 2013
    Mesajlar:
    11.296
    Beğenileri:
    7.483
    Ödül Puanları:
    11.080
    Cinsiyet:
    Bayan
    Meslek:
    Öğrenci
    Yer:
    izmir :)
    Banka:
    213 ÇTL
    İyi Bir Okul Nasıl Olmalı
    Students are trained in the school as the future citizens of the country. Unless the schools are ideal the country cannot get ideal citizens. Let us know what an ideal school is.
    Situation:
    An ideal school is situated in a peaceful site in the lap of nature full of beautiful sceneries. It is situated in a vast compound that admits nature’s free air and free light. It is situated in a place which is served by natural spring of water and by sweet-scented flowers spreading their fragrance all around and by good climatic conditions.
    Building:
    The building of an ideal school should be large and spacious. The classrooms, the common rooms and the office-rooms should have a good number of windows to let in free air and free light. In a classroom there should be five square feet space for each of the students.
    Students:
    In an ideal school there are no more than twenty students in each of the classes. Each students is provided with a single chair and a single desk, which are in quite good condition.
    Staff:
    An ideal school is provided with an ideal staff. The teachers of an ideal school are well qualified. They are greatly interested in learning and teaching. They do not have any mercenary motive. They take teacher ship as a mission in their life. They work in the school with a missionary spirit. They are the men of character and integrity. They work together with a team-spirit and with full co-operation and understanding among themselves.

    Educational requirements:
    An ideal school is well-supplied with all sorts of educational requirements like apparatus and appliance maps, charts and globes, libraries and laboratories, magazines and newspapers, radio, television and audio-visual projectors, museum and swimming pools, lawns and gardens and stadium and gymnasiums. An ideal school must have an ideal hostel quite close to its situation.
    If we want that our country should be an ideal country and our nation should be an ideal nation, we should make our schools ideal. An ideal school is the greatest asset for the students whom it serves.
     
    CenX bunu beğendi.
  2. dderya
    Ayyaş

    dderya kOkOşŞ Süper Moderatör

    Katılım:
    29 Temmuz 2013
    Mesajlar:
    11.296
    Beğenileri:
    7.483
    Ödül Puanları:
    11.080
    Cinsiyet:
    Bayan
    Meslek:
    Öğrenci
    Yer:
    izmir :)
    Banka:
    213 ÇTL
    ELMANIN FAYDALARI
    Health benefits:

    1. Apples are filled with soluble fiber (5 grams). This fiber has been shown to reduce intestinal disorders, including diverticulitis, hemorrhoids and possibly some types of cancer. It helps control insulin levels by releasing sugar slowly into the bloodstream. It cleanses and detoxifies, which helps eliminate heavy metals, such as lead and mercury.
    2. Apple pectin helps reduce cholesterol levels by lowering insulin secretion.
    3. In two studies researchers found that eating five apples a week lowered the risk for respiratory diseases like asthma.
    4. According to Chinese Medicine: Apples strengthen the heart, quench thirst, lubricate the lungs, decrease mucous and increase body fluids.
    5. Apple cider vinegar can help prevent the formation of kidney stones.
    6. Studies indicate that eating apples daily can reduce skin diseases.
    7. According to a Brazilian study, eating an apple before a meal helped women lose 33 percent more weight than those who didn’t.
    8. An apple has only 50-80 calories and has no fat or sodium.
    9. Apples are packed with vitamins C, A, and flavonoids and with smaller amounts of phosphorus, iron and calcium.
    10. Apples provide a source of potassium which may promote heart health.
    11. So there you have it … lots of good reasons why it is good for you to eat an apple a day! I like apples so much that when I started living by myself I substituted those sugar laden cereals with an apple.
     
    CenX bunu beğendi.
  3. dderya
    Ayyaş

    dderya kOkOşŞ Süper Moderatör

    Katılım:
    29 Temmuz 2013
    Mesajlar:
    11.296
    Beğenileri:
    7.483
    Ödül Puanları:
    11.080
    Cinsiyet:
    Bayan
    Meslek:
    Öğrenci
    Yer:
    izmir :)
    Banka:
    213 ÇTL
    How to Be Healthy and Happy
    Edited by Illneedasaviour, Krazycommando, Ranae, Swathi Reddy and 6 others
    We all want to be healthy and happy in life and sometimes you don’t know how to! If you want to know how follow these steps which will help to get you where you want to be.
    Edit Steps
    1. Get enough sleep. It not only keeps you healthy but you will be happier. Be sure to get 8-10 hours of sleep each night and on school nights go to sleep earlier if you wake up earlier. It also helps if your bed is nice and comfy; try having warm blankets, a nice drink, or if it is hot, a window open. Always be sure to settle down and relax an hour before you go to bed because it will help you drift off more easily; read a book, watch TV but avoid doing things like homework or anything too stressful that requires you to think

    2. Eat healthy. Cut down on the junk food and eat your fruit and vegetable portions every day. This will leave you feeling generally more energetic and happy. Replace unhealthy snacks like a chocolate bar with a piece of fruit or perhaps some nuts but do make sure to treat yourself once in a while which is okay. Also cut down on too many processed foods altogether.



    3. Drink lots of water. Water is good for everything in your body and I would list them all but it’s never ending.Water helps to give you clear skin which leaves you feeling happier about your appearance as well! Water is just plain amazing for your overall health. So make sure to have it with you at all times and try to drink 8 glasses a day. Also if you do not really like the taste of water, try flavored or sparkling and maybe add some lemon slices; and of course you can always have Robinson’s squash or anything like that.


    4. 4
      Exercise. Whether it’s a brisk walk, a quick jog, dancing in your room, playing Wii Fit, anything like that will keep you feeling strong and happy. Obviously you don’t have to exercise daily because, lets face it, we don’t always have the time; but try to fit it in a little and you will like the difference.



    5. Treat yourself. By this I mean buying those shoes you always wanted, going to that football game, going shopping or simply (something I do) treating your body after showers and baths. By this I mean some nice body lotions or butters and some great perfumes and body mists. Also you can use bath fizzies or shower gel to give you that boost of happiness and your body the treat. Of course you can do this every time you shower or bathe because it’s just something to look forward to and relax with; I do.



    6. Have true friends. Bond with true friends and compliment them and appreciate them. Always show them how much you love them and treat them how you would like to be treated. Do not back stab, always stick together and stick up for each other. Do not believe any rumors; and once in a while go out and hang out with your friends; you’ll create memories and become closer.


    7. Smile and laugh. Don’t get sad over nothing and take a joke too seriously but at the same time know when it’s too far or let yourself be upset. Overall do not be pessimistic; smile and laugh all the time and you will be happy; also who knows maybe your smile might make somebody’s day.


    8. Do hobbies. This can be art, music, collecting things or whatever that makes you happy and makes you yourself. Try to be active and celebrate your achievements. Give gifts without expecting to receive anything else; keep yourself busy and happy.



    9. Help out your family. Help your mum do the dishes, help out your dad in the kitchen, hoover your room or anything that could help your family. It will not only make them love you more but you will feel happy knowing you have done good.


    10. Ignore rumors, insults and avoid the stupid people. This is possibly one of the hardest and I’m still working on it but I know when I have cracked it, I will have a weight lifted off my shoulders. When that stupid boy or girl calls you ugly, do not respond, just walk away with your head held high because at the end of the day, they will give up if they don’t get the reaction out of you that they want. Not only will you realize these people aren’t worth it but it will keep you out of a lot of trouble at school and in general. If there is the most irritating rumor or rumors about you going round for maybe an year and it’s just gone too far, just take a deep breath and think about the fact you know it’s not true and that is all that matters; this is the most powerful thing. Ignore and avoid anybody who thinks otherwise because they are just trying to wind you up. Stupid people… this can be a whole bunch of boys and girls and you know what, just ignore them, avoid them, don’t associate with them, don’t embarrass yourself around them and generally steer clear of these people and you will be happier and more relaxed in life.


    11. Remember the important things. Remember popularity isn’t everything and I would much rather choose true friends over that. Remember, sometimes you have to let a friend go and make another one. Remember that words can hurt. Remember you only live once and life is what you make it. Remember all these things and much more and you’ll know what to make out of your life.


    12. Cut out stress in your life. This keeps you healthy and definitely happy. Take deep breaths, do yoga, relax and avoid stress at all times, it’s not good for you. Read and write, keep a diary, listen to music to calm you down, sit on your windowsill and look at the beautiful sky.


    13. Be confident. Give yourself a makeover, inside and out. Look in the mirror and see your beauty. Use a day and night wash to get rid of acne. Moisturize and replenish your body. Smile and embrace happiness. Know that we all come in different shapes and sizes and it’s the inside as well as the outside. Wear that great perfume. Strut your stuff. Stand up straight and keep your head held high. Learn to be confident and who you are because nobody’s perfect. You are amazing! Trust me, you are!


    14. Have goals and dreams, and achieve them. Failure comes in can’t and success comes in cans. Always believe you can achieve. If you can dream it, you can achieve it; no matter what. Of course keep goals and dreams realistic. You can’t become the Hulk or something but you can get A*’s in all of your exams, if you work for it.


    15. Keep on top of schoolwork and stay organized. Get homework over and done with and hand it in on time.Revise for that test. Keep things neat and tidy. Have a workspace and a timetable. Store work in folders and make sure you know where everything is so you don’t panic, and whatever you do, don’t procrastinate. I mean, let’s face it, we have all been there but don’t go there again.


    16. Get out and enjoy the fresh air. Go out with friends, go to a party, get together with the family, go on a bike ride, take a walk with your pet, and enjoy!


    17. Always stay true to who you are. Never change yourself for anyone and anything. Always stay true to your faith and beliefs. Always have your dignity, never have regrets, always be the best that you can be! Also surround yourself with the people and things that you love.


    18. Be inspired by music and quotes. It’s unbelievable how much this can affect you and change your whole life. So get inspired and love it.


    19. Don’t be superficial. It doesn’t do anyone any favors. Better to be hated than loved for what your not.


    20. Love life. You have to love your life! Be proud,and laugh lots! Dream and wish, be whoever you want to be.Take life and make it what you want. When life gives you lemons squirt life in the eye with the lemons!Explore, dream, discover. Be smart enough to hold on to and be brave enough to let go. Find and create yourself. Take risks. Reject the status quo. Stick up for yourself. Take chances, you never know where they can lead you to. Life goes on. Follow your gut. Love yourself. If you are doing your best, you won’t have time to worry about failure. A journey of a thousand miles begins with a single step. Life is music, love are the lyrics.Stay strong. Failure is the door to success. You must make a choice to take a chance or your life will never change. You don’t forgive people because your weak, you forgive people because you are strong enough to know people make mistakes. When you want something you have never had, you have to do something you have never done. And lastly, you are beautiful!
     
    CenX bunu beğendi.
  4. dderya
    Ayyaş

    dderya kOkOşŞ Süper Moderatör

    Katılım:
    29 Temmuz 2013
    Mesajlar:
    11.296
    Beğenileri:
    7.483
    Ödül Puanları:
    11.080
    Cinsiyet:
    Bayan
    Meslek:
    Öğrenci
    Yer:
    izmir :)
    Banka:
    213 ÇTL
    What are Cell Phones?

    Cell phones, also known as mobile phones or wireless phones, are hand-held phones with built-in antennas. Unlike home phones, cell phones can be carried from place to place with a minimum of fuss. This makes them a good choice for people who want to be in touch with other people even when they are away from the house.

    How Do Cell Phones Work?

    Not many people know it, but cell phones are actually two-way radios, much like the walkie-talkies of the past, albeit much more advanced. When you talk into your cell phone receiver, it registers your voice and converts the sound into radio waves. These waves travel through the air until they reach a receiver, which is usually found at a base station. This station will then send your call through a telephone network until it contacts the person you wish to speak with. Similarly, when someone places a call to your cell phone, the signal travels through the telephone network until it reaches a station near you. The station sends the radio waves out into the neighboring areas. These radio waves are then picked up by your cell phone and converted into the sound of a human voice.

    Cell phones are a vast improvement over the telecommunications technology of the past, and are daily becoming a fixture of modern life. As always, communication is vital, and cell phones will help you to better communicate with the key people in your life. Using a cell phone is one of the first steps you must take to participate effectively in the emerging global economy.
     
  5. dderya
    Ayyaş

    dderya kOkOşŞ Süper Moderatör

    Katılım:
    29 Temmuz 2013
    Mesajlar:
    11.296
    Beğenileri:
    7.483
    Ödül Puanları:
    11.080
    Cinsiyet:
    Bayan
    Meslek:
    Öğrenci
    Yer:
    izmir :)
    Banka:
    213 ÇTL
    İyi Bir Arkadaşın Tanımı
    Friends are the family we choose ourselves. Unlike your brother or sister, whom you have to accept no matter you like them or not, but a friend is chosen by us. And, if you find a good friend, you have found yourselves a treasure and it is up to you to retain this treasure or lose it. Follow these tips to retain the person in your life.



    1) PAY ATTENTION

    Everyone likes it when some one is giving attention to the problems and help them solving. Remember, People will not come to you to pay attention to you but for the attention you pay to them.

    2) SURPRISES

    The best way to enter into one’s heart is to give an unexpected gift at an unexpected time. Don’t forget the important dates like Birthday etc. On birthday, be the first one to wish like at 12 am exactly.

    3) EXCHANGE SONGS, MOVIES

    If you have downloaded songs or movies of your friend’s favourite artist, share with him/her.

    4) BE FRANK

    Tell your friend your secrets like your crush or your first crime etc. Dont forget to mention that he/she is the first person to whom you are disclosing these secrets of yours.

    5) BE TRUTHFULL

    It breaks everybody’s heart when that persons get to know that you have been lying about something, no matter how small.

    Your friend loves you for the person you are and not the person have been faking.

    6) APOLOGIZE

    When ever you do something wrong like getting late for picking him/her up etc, Apologize.

    READ THIS

    I’ll Be Here
    I cannot ease your aching heart,
    Nor take your pain away;
    But let me stay and take your hand
    And walk with you today.
    I’ll listen when you need to talk,
    I’ll wipe away your tears;
    I’ll share your worries when they come,
    I’ll help you face your fears.
    I’m here and I will stand by you,
    On each hill you have to climb;
    So take my hand, let’s face the world. . .
    And live just one day at a time.
    You’re not alone, for I’m still here,
    I’ll go that extra mile;
    And when your grief is easier,
    I’ll help you learn to smile
     
  6. dderya
    Ayyaş

    dderya kOkOşŞ Süper Moderatör

    Katılım:
    29 Temmuz 2013
    Mesajlar:
    11.296
    Beğenileri:
    7.483
    Ödül Puanları:
    11.080
    Cinsiyet:
    Bayan
    Meslek:
    Öğrenci
    Yer:
    izmir :)
    Banka:
    213 ÇTL
    Çevre Kirliliği

    Every year we produce millions of tonnes of it What do we do with our rubbish?Very ogten we burn it or bury it.but this isn’t good fort he enviroment.Some of the rubbish produces poisonous gases and other other pollution(air,earth…)Recycling is an ecological solution to this problem.

    When we recycle materils or object we use them again We can’t do this with all of our rubbish but in many places there are now bins for recycling paper glass and aluminium.People are learning to use these recycling bins.They’re also learning to think about the enviroment before they throw away their rubbish.
    We can change our ideas about houses,too.Bricks and concrete are good materials,but somebody now prefers to make houses with recycled materials.The name for these ecological houses is “earthships”.People maket hem from bottles,aluminium cans,wood and earth.They are modern cheap and very attractive.In the future,remember-don’t bury your rubbish,live with it!

    There are also some very original ideas for recycling:some people make shoes from old rubber and plastic and shopping bags from old clothes ; other people make toys and other things from aluminium cans.Old metal ,computer parts and glass can become jewellery or recycled art
     
  7. dderya
    Ayyaş

    dderya kOkOşŞ Süper Moderatör

    Katılım:
    29 Temmuz 2013
    Mesajlar:
    11.296
    Beğenileri:
    7.483
    Ödül Puanları:
    11.080
    Cinsiyet:
    Bayan
    Meslek:
    Öğrenci
    Yer:
    izmir :)
    Banka:
    213 ÇTL
    Balıklar Hakkında

    A fish is any gill-bearing aquatic vertebrate (or craniate) animal that lacks limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups. Because the term is defined negatively, and excludes the tetrapods (i.e., the amphibians, reptiles, birds and mammals) which descend from within the same ancestry, it is paraphyletic. The traditional term pisces (also ichthyes) is considered a typological, but not a phylogenetic classification.

    Most fish are “cold-blooded”, or ectothermic, allowing their body temperatures to vary as ambient temperatures change. Fish are abundant in most bodies of water. They can be found in nearly all aquatic environments, from high mountain streams (e.g., char and gudgeon) to the abyssal and even hadal depths of the deepest oceans (e.g., gulpers and anglerfish). At 32,000 species, fish exhibit greater species diversity than any other class of vertebrates.

    Fish, especially as food, are an important resource worldwide. Commercial and subsistence fishers hunt fish in wild fisheries (see fishing) or farm them in ponds or in cages in the ocean (see aquaculture). They are also caught by recreational fishers, kept as pets, raised by fishkeepers, and exhibited in public aquaria. Fish have had a role in culture through the ages, serving as deities, religious symbols, and as the subjects of art, books and movies.
     
  8. dderya
    Ayyaş

    dderya kOkOşŞ Süper Moderatör

    Katılım:
    29 Temmuz 2013
    Mesajlar:
    11.296
    Beğenileri:
    7.483
    Ödül Puanları:
    11.080
    Cinsiyet:
    Bayan
    Meslek:
    Öğrenci
    Yer:
    izmir :)
    Banka:
    213 ÇTL
    Nükleer Enerji

    Energy Is An Absolutely Necessary Input For The Primary Needs Of Human Beings For Mechanical Work, Food, Communication, Transportation And The Others. Although It Is Essential For Many Purposes, In These Years Many Developing Countries Face The Lack Of Energy Resources. Therefore, Many Of The Developing Countries Are Searching For New Energy Resources, Especially Renewable Primary Energy Resources. These Renewable Energy Resources Like Wind Energy, Solar Energy, Geothermal Energy And Nuclear Energy Have Low Impacts On The Environment. ıt Is My Contention That, Nuclear Energy Is The Most Useful And Powerful Energy Resource Of The Renewable Energy Resources, If It Is Used Properly And Its Wastes Are Stored.
    Admittedly, It Is Considered As The Most Dangerous Energy Source. Every Year Nuclear Plants Are Shut Down And Old Fuels Are Removed From The Plant. These Fuels Have Huge Amount Of Radiation And Radiation Of These Fuels Make Living Things Dead Where They Are Put. However Its Wastes Are Stored In Steel Containers Which Preserve Nature From Radiation. Moreover, Nuclear Wastes Are So Compact That They Require The Smallest Area Of Other Energy Resources. This Compactness Of Nuclear Fuels Of Working Plants Can Cause Big Explosions When The Plant Is Old. Nuclear Power Plant Explosions Like Chernobyll And Three Mile ısland Resulted In Death Of Many People Around The World. However Nuclear Power Plants Do Not Have Any Explosions If The Old Plants Are Removed And Shut Down.
    Firstly, Nuclear Energy Has The Lowest Impact On The Environment Of Any Energy Resources. ıt Does Not Have Any Significant Effects To Water Land, Air And Wildlife. According To A Research By Nuclear Energy ınstitute , Nuclear Power Plants Do Not Emit Harmful Gases Like Carbon Dioxide, Sulphur Dioxide And Nitrogen Oxides. ın Usa, Nuclear Power Plants Reduced Carbon Dioxide Emissions By More Than 90 Percent. The Harmful Gases, Which Are Emitted By Other Power Plants, Cause Greenhouse Effect And Acid Rains. Greenhouse Effect, That Is Known As Global Temperature Warming, Is The Most Dangerous Impact Of Coal Plants And Oil Plants. ıt Changes The Average Temperature Of Atmosphere And This Causes An Imbalance In The Environment. ın This Way Acid Rains Which Do Sulphur Oxides Form And Carbon Oxides Have Great Effects On The Environment. They Destroy All Living Things On The Earth. Nuclear Energy Does Not Have Any Effects Like Those.
    Secondly, Nuclear Power Plants Output Extremely Highly Energy With Low Input. Nuclear Energy Is The Most Concentrated Source Of Energy “one Uranium Nuclear Fuel Pellet The Size Of The Tip Of Your Little Finger Is Equivalent To The Energy Provided By 1,780 Pounds Of Coal; Or 149 Galloons Of Oil; Or 17000 Cubic Feet Of Natural Gas.” ıs Said By Nuclear Energy ınstitute . Nuclear Power Plants Output High Energy By The Splitting Of Uranium Atoms In A Chain Reaction. Nuclear Energy Has Some Dangerous Sides But It Is The Proper Solution For The Energy Problem Of Developing Countries. ıt Guarantees A Long-term Resolution For The Energy Problem.
    ın Addition To These, Nuclear Energy’s Fuel Is Common And Economical. Nuclear Power Plants’ Fuel, Uranium And Its Compounds, Is Abundant In Nature. The Nuclear Fuel Occurs Naturally In The Earth’s Crust Uranium And Its Compounds Are As Common As Tin. Rich Deposits Were Discovered Having Ores With Up To 3% Of Uranium And 80% Of Uranium Compounds. Uranium Compounds Are Prepared For The Reactions In Nuclear Power Plants By Physically. ın Other Words, The Technology And Equipment For Mining And Milling Of Uranium Is Very Easy To Acquire. Moreover, The Fuel Of The Nuclear Power Plants Is Inexpensive And Efficient. “ıt Is Relatively Low In Cost And Less Sensitive To Fuel Price Increases” According To Nuclear Energy ınstitute.
    ın Conclusion, Nuclear Energy Is The Most Powerful Energy Resource For The Needs Of Human Beings For Many Different Purposes. ıt Doesn’t Have Any Adverse Effects To Nature And Living Things. Moreover, Its Wastes Don’t Need A Large Area To Be Stored In Because Its High-level Energy Output With Low Input Is The Proper Solution For The Energy Problems Of Developing Countries. Despite Its Dangerous Sides Like Radioactive Wastes And Power Plant Explosions, It Is The Most Friendly Energy Resource Whenever It Is Used Properly. Nuclear Energy Is Also Cost-effective Because Of Stable Fuel Prices And High-level Energy Performance. Nuclear Energy Should Be Used For Its High-level Energy Potential And Its Benefits
     
  9. dderya
    Ayyaş

    dderya kOkOşŞ Süper Moderatör

    Katılım:
    29 Temmuz 2013
    Mesajlar:
    11.296
    Beğenileri:
    7.483
    Ödül Puanları:
    11.080
    Cinsiyet:
    Bayan
    Meslek:
    Öğrenci
    Yer:
    izmir :)
    Banka:
    213 ÇTL
    The Soccer Ball
    The soccer ball is characterized by its mass, diameter, internal pressure and surface texture. The full size ball is required to have a mass between 396 g and 453 g, a circumference between 68.5 cm and 71.1 cm, and an internal pressure of 0.6 to 1.1 atmospheres. The outer casing or cover should be of leather or another approved material which does not prove dangerous to players. It may be constructed in two main ways either with panels of material sewn together, or moulded from rubber or plastic with cover panels bonded or painted to the surface. The mass of the ball is restricted by the rules of the game but small variations in mass can occur due to the absorption of water through the seams of the ball, or by absorption through the material. It has been found that both moulded and stitched balls absorbed moisture after a prolonged period of soaking, and that the moulded ball increased its mass by 1.3 % while the stitched ball increased its mass by 7.5 %. The increase in mass yielded an increase in impact force of 2.8 % for the moulded ball and 8.5 % for the stitched ball. The increase in force was thought to be directly related to the increase in ball mass (Armstrong et al. 1988). In comparison of the impact force for moulded and stitched balls dropped from 18 m (providing an impact velocity of 18 m/s ) was found that the mean impact forces ranged from 851 N for the moulded ball to 912 N for the stitched ball and the rise time of the moulded ball was 27% lower than for the stitched ball (Lewendusky et al. 1988). The performance of a ball is described by the way it flies through the air, bounces, slides and rolls on the ground. It is known from mechanical theory that a heavier ball will retain more of its initial velocity during flight, and that the aerodynamic forces of drag and lift acting on the ball will cause it to alter its flight path, particularly when the ball spins. Spin affects ball flight markedly, to the extent that the use of ball spin becomes a game tactic and as such, one might expect that characteristics of ball construction on this aspect of performance would have been scientifically investigated. There is published research on the flight characteristics of the soccer ball as a function of ball variables including spin. If the release angle, release velocity and spin have been constant, the projectile of the ball has been more stable than with the without spin (Luhtanen et al. 1993). When dropping a soccer ball from a height of 18 m and hitting the target force platform below. The success rate hitting the target was no better than 7% (Lewendusky et al. 1988). This was explained by the aerodynamic Magnus force acting on the ball as it slowly rotated during its descent. With regard to bouncing, sliding and rolling it has been shown that the resilience of the ball on the surface is determined more by the characteristics of the surface than the ball. This is also likely to be true of the frictional properties between a ball and the surface which determine its skid and roll behavior.
     
  10. dderya
    Ayyaş

    dderya kOkOşŞ Süper Moderatör

    Katılım:
    29 Temmuz 2013
    Mesajlar:
    11.296
    Beğenileri:
    7.483
    Ödül Puanları:
    11.080
    Cinsiyet:
    Bayan
    Meslek:
    Öğrenci
    Yer:
    izmir :)
    Banka:
    213 ÇTL
    Güneş Gözlüğü ve Özellikleri

    A pair of sunglasses seems so simple — it’s two pieces of tinted glass or plastic in some sort of plastic or metal frame. How much more straightforward can something get? It turns out that there are many different things you can do with two pieces of glass, and these things can have a big effect on you when you use the lenses. As you will see in this article, there really is a difference between the various sunglasses you’ll find out there.
    There are four things that a good pair of sunglasses should do for you:
    • Sunglasses provide protection from ultraviolet rays in sunlight. Ultraviolet (UV) light damages thecornea and the retina. Good sunglasses can eliminate UV rays completely.
    • Sunglasses provide protection from intense light. When the eye receives too much light, it naturally closes the iris. Once it has closed the iris as far as it can, the next step is squinting. If there is still too much light, as there can be when sunlight is reflecting off of snow, the result is damage to the retina. Good sunglasses can block light entering the eyes by as much as 97 percent to avoid damage.
    • Sunglasses provide protection from glare. Certain surfaces, such as water, can reflect a great deal of light, and the bright spots can be distracting or can hide objects. Good sunglasses can completely eliminate this kind of glare using polarization (we’ll discuss polarization later).
    • Sunglasses eliminate specific frequencies of light. Certain frequencies of light can blur vision, and others can enhance contrast. Choosing the right color for your sunglasses lets them work better in specific situations.
    When you buy a pair of cheap sunglasses, you often give up all of these benefits and can even make things worse. For example, if your sunglasses offer no UV protection, you increase your exposure to UV rays. The cheap sunglasses block some of the light, causing your iris to open to allow more light in. This lets in more of the UV light as well, increasing the damage UV light can cause to the retina.
    So there is a difference. Buying the right pair of good sunglasses for the conditions in which you use them gives you maximum protection and performance.
    The sidebar shows some of the top sunglass manufacturers. Manufacturers of other products sell sunglasses, too. From Nike and Timberland to Gucci and Kenneth Cole, many big brands include sunglasses among their product lines. Many sunglass manufacturers make huge claims about the features and special qualities of their products. Prices can range from less than $20 up to several hundred dollars depending on the features and the name.
     

Sayfayı Paylaş