Mathematics

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Navy Railgun

The railgun takes its name from the two highly-conductive and electrically charged rails that form an electric circuit once a projectile is loaded.http://www.technologyreview.com/Infotech/20164/?nlid=857&a=f Unlike an explosion using gunpowder, the railgun uses these electromagnetic currents to accelerate its non-explosive projectiles. By being sent through several electrically charged parallel rails, the railgun's projectiles are accelerated to several times the speed of sound, up to Mach 7.http://www.foxnews.com/scitech/2010/12/10/navy-railgun-shoots-bullets-electromagnet/

The weapon's design allows it to fire at two to three times the velocity of the navy's conventional weapons, allowing it to hit a target within 6 minutes. The railgun also has a longer range than the navy's conventional weapons, currently being able to fire up to 100 miles. The navy hopes to achieve the even higher range of 200 miles and pinpoint accuracy at this range through GPS technology.http://www.foxnews.com/scitech/2010/12/10/navy-railgun-shoots-bullets-electromagnet/

updated 2010-12-16 23:10:56

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Mental Math

• Amazon.com: Mental Math Books

• Half.com: Mental Math Books

• Google Book Search: Mental Math Books

• Mental Math Master: The Best Strategy for Learning Mental Math

• • This page was created by Lorraine, a Part Time Guide in the Mahalo Greenhouse (see the original), quality controlled by Cherryl, and curated by Matt.

• If you'd like to help us create the best spam free search results on the Internet, apply to be a Part Time Guide!</em>

updated 2010-07-17 15:17:52

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Freeman Dyson

• 1979: Disturbing the Universe
• 1984: Weapons and Hope
• 1988: Infinite in All Directions
• 1999: The Sun, The Genome and The Internet
• 2006: The Scientist as Rebel
• 2007: Advanced Quantum Mechanics
• 2007: A Many-Colored Glass: Reflections on the Place of Life in the Universe

updated 2010-07-17 05:46:57

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Algae

updated 2010-09-22 23:03:26

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Forrest Bird

• June 9, 1921: Born

• 1935: Flew his first solo flight as a pilot, age 14

• 1941: Enlisted in the United States Army Air Corps

• 1955: Release of the Bird Universal Medical Respirator

• 1985: Lifetime Scientific Achievement Award

• 1995: Inducted into National Inventors Hall of Fame

• 2001: Named Inventor of the Week by MIT

• 2005: Lifetime Scientific Achievement Award

• 2007: Bird Aviation and Invention Museum in Sagle, Idaho Grand Opening

• • This page was created by Cablesgal, a Part Time Guide in the Mahalo Greenhouse (see the original), and curated by Lon.

• If you'd like to help us create the best spam free search results on the Internet, apply to be a Part Time Guide!</em>

updated 2010-07-17 05:32:49

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Mathematics

• • A Beautiful Mind (2001)
  • Good Will Hunting (1997)
  • Proof (2005)
  • Pi (1998)
  • Moebius (Argentina,1996)
  • Enigma (2001)

updated 2010-07-17 14:57:36

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Platelet

Platelet formation helps stop bleeding, but it can also cause pathological thrombosis and resulting cardiovascular disorders. Pathologies of the vessel wall, such as atherosclerosis, and can lead to the growth of aggregates that occlude blood flow and prevent oxygen from reaching tissue downstream of the occlusion. This forms an aggregate is called a thrombus. Platelet thrombi can form at sites where atherosclerotic plaques rupture and can lead to complete blockage of the vessel, causing a significant risk of myocardial infarcts. Thrombi are also associated with prosthetic devices, including artificial cardiac valves and vascular grafts. Studies indicate that the geometry of prosthetic devices influences blood flow and it determines the rate and extent of pathological platelet aggregation. www.math.utah.edu/~guy/fogelsonguyMMB2004.pdf

updated 2010-07-17 18:59:11

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How to Solve Quadratic Equations

For the equation 3x² = 6, you can use the quadratic equation to solve it.  Before putting it in standard form, you should recognize that the equation can be simplified even further by dividing each side by 3.

3x²/3 =6/3

x² = 2

Put the equation in the standard form: x² + 0x - 2 = 0

You can find out how many solutions it will have using a = 1, b = 0 and c = -2.  The formula for the discriminant is -b -4ac, or for this equation it is 0 - 4(1)(-2) = 8.  Since 8 is greater than zero, this quadratic equation will have two solutions.

Using the values for a, b and c into the quadratic formula and putting the solution for the discriminant into the parentheses behind the square root, the solutions for the equation are:

x = [0 ± SQRT(8)]/2(1)

x = ± SQRT(8)/2

The square root of 8 is approximately equal to 2.8, so the two solutions to the equation are +2.8/2 and -2.8/2.  These solutions simplify to +1.4 and -1.4  you can plug each value into the original equation to check your work.http://library.thinkquest.org/20991/alg2/quad.html 

updated 2011-02-14 01:37:53

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NASA Shrimp

Last November, NASA had a pleasant surprise, while they were drilling a hole in the Antarctic Ice, performing an experiment on inhospitable living conditions. After drilling a hole of 600 feet in the Antarctic ice shelf, NASA had lowered a cable into the hole, with a camera attached. At a depth of 600 feet, when they broke through the Ice Shelf, a small shrimp hovered through the view of the camera. The footage of the shrimp, with the Latin name Lyssianasid amphipod, was released to YouTube on March 16, 2010.

In the 2:14 minute long video, the viewer is treated with an backwards view, facing the surface (which is only a black hole, because of the distance). One can see the rope, which the camera is hanging on, and the contours of the hole, with a regular chopped surface, from the drill. After some ten seconds, an orange creature swims into view, from the right-top corner. The creature swims around, and can be easily identified as a shrimp when it examines the rope. The shrimp leasurely swims around, before swimming out of view again. At that point, the camera is lowered through the hole again, showing the exit point under the ice shelf, where the shrimp is seen once again, before descending further down.

According to reports, the shrimp wasn't the only discovery made, as also a tentacle, presumably belonging to a jellyfish was found and retrieved. The discovery of the shrimp and tentacle has sparked discussion of ...

updated 2010-07-17 16:34:18

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