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The Wrong Way to Win - 0 views

  • The Wrong Way to Win › Introduction to The Wrong Way to Win › Why Do Athletes Use Performance-enhancing Drugs? › Masking Pain and Managing Weight and Stress › Detecting Drugs Why Do Athletes Use Performance-enhancing Drugs?
  • An athlete may want to: Build mass and strength of muscles and/or bones Increase delivery of oxygen to exercising tissues Mask pain Stimulate the body Hide use of other drugs
  • Many drugs are banned outright in Olympic competitions. However, some drugs, such as cortisone and local anesthetics, are merely restricted because they have legitimate clinical uses. Athletes may also misuse drugs to reduce weight, relax, cope with stress or boost their own confidence. Whatever the reason, doping has many unsafe if not deadly side effects.
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  • Another method for improving oxygen concentration is blood doping -- infusing whole blood into an athlete. An athlete who infuses his own blood may cause infection or cardiovascular problems because of the increased blood volume (high blood pressure, blood clots, heart failure and stroke). An athlete who uses someone else's blood runs the risk of acquiring viral infections such as HIV/AIDS. These are huge risks for a result that can also be achieved by training at high altitudes.
  • In addition to taking drugs that build mass and strength, some athletes take drugs and engage in practices that increase the amount of oxygen in tissues. Endurance athletes, like cyclists or cross-country skiers, may use Erythropoietin (EPO). EPO can increase an athlete's oxygen supply by as much as seven to 10 percent. As mentioned earlier, EPO is extremely dangerous, if not deadly in some cases. The increased red cell density caused by EPO can thicken the blood. The thickened blood -- which is more like honey than water -- cannot flow through the blood vessels well. To pump the thickened blood, the heart must work harder. This increases the chances of heart attack and stroke.
  • Athletes looking to build mass may also abuse Human Growth Hormone (hGH). Excessive hGH levels increase muscle mass by stimulating protein synthesis, strengthen bones by stimulating bone growth and reduce body fat by stimulating the breakdown of fat cells. Use of hGH has become increasingly popular because it is difficult to detect. Side effects include overgrowth of hands, feet, and face (known as acromegaly), enlarged internal organs, especially heart, kidneys, tongue and liver and heart problems.
  • Athletes use anabolic steroids to increase muscle strength. Anabolic steroids, which can be injected or taken as pills, allow the athlete to train harder and longer at any given period. The possible and well-known side effects of anabolic steroid use include jaundice and liver damage, mood swings, depression and aggression. Men may also suffer from baldness, infertility and breast development. Females may grow excessive hair on the face and body and suffer from infertility. The substances Human Chorionic Gonadotropin (hCG), Luteinizing Hormone (LH) may also produce the same side effects.
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    use it
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    Use this site for information
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Five reasons to buy Yahoo stock - Oct. 23, 2008 - 0 views

  • Yes, Yahoo is losing share to Google. Yes, Yahoo is barely growing. Yes, it's a tired argument that Yahoo is one of the strongest brands in the media world. Yes, this argument for owning its stock hasn't worked in a long time.
    • Eriel Eaglin
       
      yahoo is loosing shares to Google
  • It's cheap. There's always that. Morgan Stanley's Mary Meeker figures that given the value of Yahoo's cash and its publicly traded Asian assets (even taking into account the difficulty in selling stakes in other companies), investors value Yahoo's core business at just $6 per share, or eight times Wall Street's estimates of 2009 profits. That's an extraordinarily low multiple for any company with the opportunities in front of it that Yahoo has. Yahoo's management thought Yahoo was cheap at $30, of course. Today, investors would do quite nicely for a fraction of that amount. 
    • Eriel Eaglin
       
      they say that yahoo stocks are cheap
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    buy yahoo stocks
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Grolier Multimedia Encyclopedia - 0 views

  • basic laws of physics dictate that energy is conserved and can only be changed from one form to another or into matter.
  • Fuel, on the other hand, is the accumulation of matter and therefore represents a store of energy.
  • released in the form of heat when the fuel is burned in chemical or nuclear reactions
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  • cannot be reversed to regenerate the original fuel mass
  • a fuel problem does exist
  • If the supply of fuel is finite, not only will there be no energy supply when the fuel is exhausted
    • Kate L
       
      Finite means: a form of a verb that can occur as the head of a sentence. In Sam wants to leave, wants is finite, leave is non-finite.
  • all other processes that depend on it will cease
  • Several factors combine to make the problem an urgent one
  • World population
  • demand for energy will also increase
  • coal, oil (petroleum), natural gas, uranium, and fuel wood—is limited and insufficient to sustain rapid rates of development.
  • debate about the exact length of time available before the effects of a worldwide shortage become apparent
  • shortage will occur.
  • geothermal energy, hydroelectric power, peat, ocean thermal energy, solar energy, tidal energy, wind power, and fuel wood.
  • replenish themselves naturally in a relatively short time and will therefore always be available.
  • Renewable energy resources
  • indirectly responsible for many other renewable energy sources.
  • ocean currents and winds are results of the uneven distribution of solar radiation over the Earth's surface
  • winds in turn produce waves whose energy can be utilized
  • windmills and wind power
  • ocean thermal energy, solar heating of the upper layers of the ocean produces temperature gradients that can be harnessed to generate electricity
  • Sun also powers the hydrologic cycle, in which ocean water is evaporated, transported over the continents, and precipitated as rain or snow to form rivers
  • flow energy produces hydroelectric power.
  • energy locked in such renewable fuel sources as wood and peat is derived from the Sun by the process of photosynthesis.
  • renewable energy source is geothermal energy
  • arises through the leakage of heat from the Earth's interior to the surface
  • over the entire surface of the Earth at a very low average rate, leakage is much higher in certain locations.
  • Yellowstone National Park
  • Iceland, Italy, and New Zealand.
  • possible to tap the heat and use it for human purposes.
  • Nonrenewable resources originate from two processes: (1) photosynthesis, which occurred many millions of years ago, followed by the fossilization of the plant and animal life that resulted, and (2) the formation of the Earth itself.
  • fossil fuels—coal, oil (petroleum), and natural gas;
  • produced the fuels for nuclear energy, such as uranium for fission and lighter elements for fusion
  • irreplaceable fuels represent an energy capital that must be invested wisely.
  • A cleaner-burning fuel than oil, natural gas seemed to be in abundant supply at the turn of the 21st century and, with the greatly enlarged network of gas pipelines, was rapidly growing in use.
  • nearly total dependence on fossil fuels and hydroelectricity ensures that efforts to solve energy problems by switching to alternative sources will have to overcome a great deal of inertia, both economic and psychological.
  • sources as solar power, wind power, and synthetic fuels suffer from the serious drawback that few major installations now exist.
  • handicapped by the engineering problems of converting the energy to a form useful to human beings.
  • solar energy reaches the top of the atmosphere in amounts 10,000 times greater than all human production of energy, it reaches the Earth's surface at rates of only about 80 to 250 W/m2, and considerably less on cloudy days.
  • arge-scale system based on solar-collector panels will be physically huge, causing problems of maintenance and land use
  • Wind power, wave power, and ocean-thermal-generation sources suffer from similar difficulties
    • Kate L
       
      Even though there are some difficulties with working towards the alternative fuels, it may prove to be more efficient for smaller things (heat and power to small communities or single buildings) in the long run
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    Energy Problem
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How Volcanoes Work - Krakatau, Indonesia - 0 views

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    after Krakatoa erupted it lost a large amount of land and then later on (sometime in the future im not sure when) it erupted under the sea and out came the new Krakatoa
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Hong 10 - Wikipedia, the free encyclopedia - 0 views

shared by Patrick Wan on 08 Dec 08 - Cached
  • Hong 10
  • Kim Hong-Yeol
  • The name Hong 10 comes from using a Korean language homonym and an English language pun. The second syllable of his name, Yeol, has the same pronunciation as the Korean pronunciation for the number ten. Therefore, pronouncing the phrase "Hong 10" in Korean will be the same pronunciation as his real name, Hong-Yeol. However, this nickname is always pronounced in English, so he is referred to as hong-ten regardless of the language context - whether Korean or English or otherwise. The nickname "Hong 10" is also a play on the surfer term "Hang Ten".[4]
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  • Hong 10 is recognized as a superb all-around b-boy able to dynamically hit beats with floorwork, freezes, uprock/toprock and powermoves - not to mention the rare ability to mix all of them in a set. His breakdancing features bridge-like floor work, sharp execution, and an arsenal of signature moves. These all showcase not only the complex nature of his dance, but also his creativity.[5]
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Why Do We Celebrate Thanksgiving - LoveToKnow Party - 0 views

  • As a celebration steeped in American history, you might expect it to be a day of remembering our forebears and displaying patriotism. However, in modern times, consideration of the first Thanksgiving is generally relegated to schoolchildren. Although that first celebration was a landmark moment in the history of America, beyond giving thanks for freedom and safety, you won't typically find the flag waving of the Fourth of July or Memorial Day. Instead, the holiday remains centered on family, friends, and food. Some see the holiday as a last bastion of non-commercialization. Beyond a few centerpieces and themed party supplies, Thanksgiving doesn't receive the same marketing push as Valentine's Day, Halloween, or especially Christmas. It feels more pure in this regard. However, the time and money required to create a traditional Thanksgiving spread doesn't make the day completely free of pressure. As a national holiday, Thanksgiving means a day free from school and work for most. Even television seems to conspire to bring families closer together, with spectacles such as the Macy's Thanksgiving Day parade, big football games, and themed marathons on numerous cable channels inviting everyone to gather 'round. Although giving thanks for the many blessings of life is easily interpreted as a religious sentiment, there is no particular creed or belief system associated with the holiday. A community might host an ecumenical service in honor of the holiday. Families often say a prayer over the food before beginning dinner. Churches sponsor holiday dinners as outreach to the poor and lonely. However, all of these actions are founded on the basic, secular premise of giving thanks. From preschoolers making handprint turkeys to adults remembering the most important people and moments in their lives, it is easy to answer, "Why do we celebrate Thanksgiving?" Like the Pilgrims did on that long-ago day, we all gather to give thanks for the many bounties life offers.
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The Energy Story - Chapter 15: Solar Energy - 0 views

  • Solar energy can also be used to make electricity.
  • solar power plants, like the one in the picture to the right in California's Mojave Desert, use a highly curved mirror called a parabolic trough to focus the sunlight on a pipe running down a central point above the curve of the mirror.
  • mirror focuses the sunlight to strike the pipe
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  • gets so hot that it can boil water into steam
  • team can then be used to turn a turbine to make electricity.
  • California's Mojave desert, there are huge rows of solar mirrors arranged in what's called "solar thermal power plants"
  • this idea to make electricity for more than 350,000 homes
  • problem with solar energy is that it works only when the sun is shining
  • cloudy days and at night, the power plants can't create energy.
  • solar plants, are a "hybrid" technology
  • daytime they use the sun
  • night and on cloudy days they burn natural gas to boil the water so they can continue to make electricity.
  • form of solar power plants to make electricity is called a Central Tower Power Plant, like the one to the right - the Solar Two Project.
  • Sunlight is reflected off 1,800 mirrors circling the tall tower
  • mirrors are called heliostats
  • move and turn to face the sun all day long
  • light is reflected back to the top of the tower in the center of the circle where a fluid is turned very hot by the sun's rays.
  • luid can be used to boil water
  • make steam to turn a turbine and a generator.
  • We can also change the sunlight directly to electricity using solar cells.
  • Solar cells are also called photovoltaic cells
  • PV cells for short
  • be found on many small appliances
  • calculators
  • even on spacecraft
  • first developed in the 1950s for use on U.S. space satellites
  • made of silicon, a special type of melted sand.
  • sunlight strikes the solar cell, electrons (red circles) are knocked loose
  • move toward the treated front surface (dark blue color)
  • electron imbalance is created between the front and back
  • two surfaces are joined by a connector, like a wire, a current of electricity occurs between the negative and positive sides.
  • individual solar cells are arranged together in a PV module and the modules are grouped together in an array.
  • arrays are set on special tracking devices to follow sunlight all day long.
  • electrical energy from solar cells can then be used directly
  • used in a home for lights and appliances
  • in a business
  • Solar energy can be stored in batteries to light a roadside billboard at night
  • energy can be stored in a battery for an emergency roadside cellular telephone when no telephone wires are around.
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    Solar/ thermal energy
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