Faces2kb: 6TH SENSE

Faces2kb: 6TH SENSE: 6TH SENSE MIT's 6th Sense device could trump Apple's multitouch by Juniper Foo February 9, 2009 10:37 AM PST 6th Sense device  MIT Media Lab...

6TH SENSE

6TH SENSE MIT's 6th Sense device could trump Apple's multitouch by Juniper Foo February 9, 2009 10:37 AM PST 6th Sense device  MIT Media Lab graduate student Pranav Mistry demonstrates the Wear Ur World device, which would free data from the confines of paper or screen. (Credit: MIT)  Step aside, Apple and Microsoft. If MIT's little Sixth Sense gadget sees the commercial light of day, we can toss our multitouch devices out the window. Who needs a Surface or an iPhone when the very idea of being able to access information by turning any flat surface into a touch-screen display sounds far more appealing? No surface available? Simply project a screen onto your hand, and voila. Shades of Minority Report? Minority Report  In Minority Report, Tom Cruise draws information from a glove-controlled interactive wall. (Credit: 20th Century Fox)  The folks at MIT have christened their wearable prototype Wear Ur World (WUW), a device cobbled together using everyday gizmos like a mobile projector, Webcam, and mobile phone. Hopefully, when the final product does ship, it'll reveal a sleeker, less clunky rendition without the colored finger bands, and one that has a discreet mode for when you need to access information privately.  As a demonstration of its capabilities, the wearer can draw a circle on his wrist, prompting the gadget to project a digital clock face, especially great for the myopic.  In the near future, WUW could become an indispensible digital wrist companion to enhance your lifestyle. It could provide product and price comparison information when shopping, retrieve flight information to let the wearer know about delays, automatically pull up related information from the Web when requested, and even snap pictures when you frame a s

NUCLEAR ENERGY

[?] Subscribe To Alternate Energy Sources.com For A Flourishing Future	How Does Nuclear Energy Work? Nuclear Energy May Depend On Highly Complex Theory And Technology But Its Concepts Are Simple Sponsored links Do you want to know "how does nuclear energy work", but you were afraid to ask? Here’s the low-down, without unnecessary complexity.Everyone knows that nuclear energy can be produced from a natural material that is found in some parts of the world, called uranium. The nuclear debate is growing in importance as governments everywhere are looking for ways to maintain economic growth AND reduce the effects of global warming. Come share your views and expertise about advantages and disadvantages of nuclear energy as a way to fight global warming here. But how does nuclear energy work? How do we get from uranium to flicking on a nuclear-powered light switch?For a thorough AND very readable explanation, read Nuclear Energy: Principles, Practices, and Prospects. Perhaps you want to know more about what is nuclear energy and about advantages of nuclear energy before you do? How does nuclear energy work? Where does its fuel come from? Uranium is an ore found in the ground. There is a lot of it in certain areas in Australia, itself possessing only one nuclear reactor for research and medical purposes only. How does nuclear energy work? Who uses it? There are a number of countries that have used nuclear energy for power generation for decades, notably France, the United Kingdom and the United States. These countries, as others have, have developed nuclear weapons too. When you have a nuclear reactor for peaceful purposes, weapons-grade plutonium can also be produced. Therefore opposition to nuclear energy has long been connected to concerns held by the nuclear disarmament movement How does nuclear energy work? The process All nuclear reactors now in operation use nuclear fission (link to advantages of nuclear energy). Nuclear fission is the process where the nucleus (hence 'nuclear' energy) of a 'heavy', fissionable atom is split. Enormous amounts of energy are released in this process. This energy, in the form of heat is transferred to steam turbines to generate electricity. So, apart from the source of energy, a nuclear energy plant is in essence no different from any fossil fuel power plant. Both use the energy source to generate heat to drive turbines that generate electricity. Electricity is then fed into a grid for domestic and industrial use. An atom’s nucleus can only split if it is ‘fissionable’. Only the nuclear isotopes Uranium 235 (U235), Plutonium 239 and Uranium 238 are of this type. Only U235 occurs naturally. The other isotopes are created in the U235’s fission process. This transformation occurs as in the fission process neutrons bombard the U235 at high speed and penetrate its atoms. Fission happens when a nucleus absorbs a neutron and splits into two nuclei that now have a different composition. Uranium as it is found contains only about 0.7% of U235 and much of the rest is uranium 238 with which it is much more difficult to achieve fission. It can be achieved with ‘fast breeder reactors’, which can blast neutrons at speeds high enough to penetrate and spit the U238’s nucleus. Therefore fast breeder reactors are more efficient users of uranium than the common thermal reactors—in fact 60 times more so—and leave far less radioactive waste. They can reuse the current nuclear waste stockpiles. Such reactors can also use thorium, a far more abundant material than uranium but containing mostly U238. There is now only one fast breeder reactor in service but scientists hope that in about 15 years more will come on stream. How does nuclear energy work? Its fuel The uranium is produced into pellets, which are in turn cast into rods. These rods are placed in the reactor core for neutron bombardment. How does nuclear energy work? Chain reaction. The common expression a ‘chain reaction’ of events comes from the nuclear fission process. The nuclei of split atoms also release one or two neutrons during fission. These hit other U235 or other isotopes which split in turn, and so on. How does nuclear energy work? Heat transfer. But how is the heat from a radioactive nuclear process safely transferred to the steam turbines that make electricity? You were going to ask, weren’t you? A liquid or gas circulates through the reactor core to transfer the heat from it to the turbines. In some reactors this gas or liquid is also used as a coolant for the reactor core. How does nuclear energy work and how can a chain reaction be stopped? When a nuclear chain is uncontrolled it overheats, causes damage to the reactor and radioactivity may spill into the environment. That’s what happened at Chernobyl where there was no separate protective building around the reactor’s housing. Essentially the chain reaction is slowed, stopped or sped up by addition of rods into the reactor core. These rods absorb neutrons, thereby affecting the nuclear process. These control rods are made of cadmium, hafnium or boron. To shut a reactor down if this system fails neutron-absorbing fluid can be added. Usually this is water, or heavy water or graphite. How does nuclear energy work and what if all safeguards fail Around the reactor core is a strong structure to prevent any intrusion from outside and to prevent any radioactive material escaping into the environment in case of a nuclear accident. Commonly this is a one meter-thick concrete and steel structure How does nuclear energy work if fuel needs to be replaced? Nuclear fuel needs to be replaced as the fissionable material is used up. The reactor core, its pressure vessel that contains the fuel rods needs to be opened for this to happen. For most reactors this happens every one to two years. A third or a quarter of the fuel rods are replaced at such times. How does nuclear energy work? Is it unnatural? Well, that’s an interesting question. U235 occurs naturally but the technology to release its nuclear energy is highly complex. And plutonium and E238 do not occur naturally. BUT… Incredibly enough nature was ahead of this technology by some 1.8 billion years! James Lovelock describes in his book The Revenge of Gaia: Earth's Climate Crisis and the Fate of Humanity that at Oklo, Gabon, in Africa some fifteen naturally occurring nuclear reactors existed , each with an output of some 20Kw. And they kept going for millions of years!!! Believe it! Or not. The above tells you about fission, the splitting of atoms to produce atomic, nuclear power. Learn about nuclear fusion here: Fusion is the forcing together of two equally charged atomic isotopes. This is how the sun is powered. For a highly entertaining (yes!) and enlightening read, try this book: Fusion: The Search for Endless Energy. Well, that’s only scratching the surface of course. If you want to know more than about how does nuclear energy work go here. Want to talk about it? Go here. Advantages Of Nuclear Energy? Want to know more to inform you in the nuclear energy debate? Like what is nuclear energy?Nuclear Radiation. A Serious Issue What's The Advantage Of Renewable Energy? Share this page:  What's This? Enjoy this page? Please pay it forward. Here's how... Would you prefer to share this page with others by linking to it? Click on the HTML link code below. Copy and paste it, adding a note of your own, into your blog, a Web page, forums, a blog comment, your Facebook account, or anywhere that someone would find this page valuable. <a href="http://www.alternate-energy-sources.com/how-does-nuclear-energy-work.html">How Does Nuclear Energy work? - In Essence It Is Simple</a> Copyright 2006-2010 Alternate Energy Sources.com SBI!