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General Science
A-Z of AVIONICS
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A-Z of AVIONICS
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Re: A-Z of AVIONICS
«
Reply #440 on:
07/02/2007 02:49:56 »
G is for GRAVITY - cant be bothered explaining it but then who doesnt know what it is!!
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Re: A-Z of AVIONICS
«
Reply #441 on:
07/02/2007 03:25:05 »
Hydrogen Peroxide
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Re: A-Z of AVIONICS
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Reply #442 on:
07/02/2007 21:10:34 »
I
nstrument panel
http://www.avsim.com/pages/0599/ernst767/main.jpg
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Re: A-Z of AVIONICS
«
Reply #443 on:
07/02/2007 21:35:25 »
J
et engine
From Wikipedia, the free encyclopedia
A jet engine is an engine that discharges a fast moving jet of fluid to generate thrust in accordance with Newton's third law of motion. This broad definition of jet engines includes turbojets, turbofans, rockets and ramjets and water jets, but in common usage, the term generally refers to a gas turbine Brayton cycle engine used to produce a jet of high speed exhaust gases for special propulsive purposes. Jet engines are so familiar to the modern world that gas turbines are sometimes mistakenly referred to as a particular application of a jet engine, rather than the other way around.
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A Pratt & Whitney F100 turbofan engine for the F-15 Eagle is tested at Robins
Air Force Base, Georgia, USA. The tunnel behind the engine muffles noise and
allows exhaust to escape. The mesh cover at the front of the engine (left of photo)
prevents foreign objects (including people) from being pulled into the engine by the
huge volume of air rushing into the inlet.
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Re: A-Z of AVIONICS
«
Reply #444 on:
07/02/2007 22:47:09 »
K
arman Theodore von
http://www.galcit.caltech.edu/graphics/history/vonKar.jpg
http://maartenrutgers.org/science/turbulence/photos/slow.jpg
http://joas.free.fr/studies/karman/images/presstotturb.jpg
Theodore von Kármán
(1881–1963).
Professor of Aeronautics 1930–1949
. First Director of GALCIT, 1930–1949. In 1926 von Kármán was invited to
Caltech
to give talks on aerodynamics, and review plans for the new wind tunnel. In 1928 he returned to Caltech for an exchange semester, and finally joined the Institute in 1929 as a research associate in aeronautics. In 1930, he was appointed professor of aeronautics and Director of GALCIT. Among his accomplishments were the first computation of
drag for a supersonic projectile; application of dimensional analysis to turbulent flow, the log-law and Kármán constant for turbulent boundary layer velocity distribution (law of the wall); fundamental studies on turbulence
; the discovery of the similarity law of transonic flow; and the use of stiffened panels in aircraft construction.
He spent most of his time in Washington after 1942. Stepped down as director in 1949 and became professor emeritus. In 1962, at age 81, he was awarded the
first National Medal of Science
, bestowed in a Whitehouse ceremony by President John F. Kennedy. On his characteristic of never declining a lecturing opportunity, he once joked "I can never pass up the opportunity to dominate the conversation for an entire hour."
from: http://www.galcit.caltech.edu/history/index.html
http://www.lbl.gov/Science-Articles/Research-Review/Highlights/1998/images/CS_flaw_prop.jpg
http://media.nasaexplores.com/lessons/04-011/images/vortex.jpg
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Re: A-Z of AVIONICS
«
Reply #445 on:
07/02/2007 23:18:11 »
The
l
aserdisc
(LD) was the first commercial optical disc storage medium, and is used primarily for the presentation of movies.
During its development, the format was referred to as the "Reflective Optical Videodisc System" before MCA, who owned the patent on the technology, renamed the format Disco-Vision in 1969. By the time the format was brought to market in 1978, the hyphen had been removed from the format name, and DiscoVision became the official name. Sales of DiscoVision players & discs began on December 15, 1978 starting in Atlanta, Georgia. MCA owned the rights to the largest catalog of films in the world during this time, and they directly manufactured and distributed the discs of their movies under the "MCA DiscoVision" label. Pioneer Electronics, who entered the market in 1978 at almost exactly the time DiscoVision titles were going on sale, began manufacturing players and printing discs under the name Laser Videodisc. By 1981, Laserdisc (first in CamelCase as LaserDisc, later without the intercap) had become the common name for the format, and the DiscoVision label disappeared, becoming simply MCA or (later) MCA-Universal Laserdisc.
MCA also manufactured discs for other companies, including Paramount, Disney and Warner Brothers. Some of them added their own names onto the disc jacket in order to signify the movie was not owned by MCA. When MCA folded into Universal several years later, Universal began re-issuing many of the early DiscoVision titles as Universal discs. The DiscoVision versions had largely been available only in pan and scan and had often utilized poor transfers. The format has also been known as LV (for LaserVision, actually a player brand by Philips). The players are also sometimes referred to as VDPs (Video Disc Players).
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I've got a few laser discs...me wonders if they are worth anything.
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Re: A-Z of AVIONICS
«
Reply #446 on:
07/02/2007 23:21:38 »
M
ycobacterium avium
http://www.md.huji.ac.il/mirror/webpath/AIDS071.jpg
http://www.waterscan.co.yu/images/virusi-bakterije/Mycobacterium%20avium.jpg
«
Last Edit: 15/05/2007 22:00:38 by iko
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Re: A-Z of AVIONICS
«
Reply #447 on:
08/02/2007 16:38:51 »
Isaac
N
ewton
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Sir Isaac Newton, (4 January 1643 – 31 March 1727) [ OS: 25 December 1642 – 20 March 1727][1] was an English physicist, mathematician, astronomer, natural philosopher, and alchemist, regarded by many as the greatest figure in the history of science.[2] His treatise Philosophiae Naturalis Principia Mathematica, published in 1687, described universal gravitation and the three laws of motion, laying the groundwork for classical mechanics. By deriving Kepler's laws of planetary motion from this system, he was the first to show that the motion of objects on Earth and of celestial bodies are governed by the same set of natural laws. The unifying and predictive power of his laws was central to the scientific revolution, the advancement of heliocentrism, and the broader acceptance of the notion that rational investigation can reveal the inner workings of nature.
In mechanics, Newton also markedly enunciated the principles of conservation of momentum and angular momentum. In optics, he invented the reflecting telescope and developed a theory of colour based on the observation that a prism decomposes white light into a visible spectrum. Newton notably argued that light is composed of particles. He also formulated an empirical law of cooling, studied the speed of sound, and proposed a theory of the origin of stars. In mathematics, Newton shares the credit with Gottfried Leibniz for the development of calculus. He also demonstrated the generalized binomial theorem, developed the so-called "Newton's method" for approximating the zeroes of a function, and contributed to the study of power series.
French mathematician Joseph-Louis Lagrange often said that Newton was the greatest genius who ever lived, and once added that he was also "the most fortunate, for we cannot find more than once a system of the world to establish."[3] English poet Alexander Pope was moved by Newton's accomplishments to write the famous epitaph:
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Re: A-Z of AVIONICS
«
Reply #448 on:
08/02/2007 16:55:05 »
orbit =
Path followed by any celestial object moving under the control of another objects gravity.
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Re: A-Z of AVIONICS
«
Reply #449 on:
08/02/2007 19:02:17 »
P
uzzle
(Leukemia etiology) [
]
https://www.mgcpuzzles.com/mgcpuzzles/images/-2004-images/2116_jigsaw_puzzle_pieces_A.jpg
«
Last Edit: 15/05/2007 21:59:57 by iko
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Re: A-Z of AVIONICS
«
Reply #450 on:
08/02/2007 19:20:04 »
Q
WERTY
QWERTY (pronounced /ˈkwərti/) is the most common modern-day keyboard layout on English-language computer and typewriter keyboards. It takes its name from the first six letters seen in the keyboard's top first row of letters. The QWERTY design was patented by Christopher Sholes in 1868 and sold to Remington in 1873, when it first appeared in typewriters.
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«
Last Edit: 08/02/2007 19:22:22 by neilep
»
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Re: A-Z of AVIONICS
«
Reply #451 on:
08/02/2007 19:31:16 »
R
adial engine
http://www.diracdelta.co.uk/science/source/r/a/radial%20engine/radial-5-002.jpg
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Re: A-Z of AVIONICS
«
Reply #452 on:
08/02/2007 19:36:32 »
S
atellite
(astronautics)
A spacecraft orbiting the Earth or other heavenly body. The first artificial satellite was Sputnik 1, launched by the USSR on 4 October 1957, and there are now more than 3000 satellites orbiting the Earth for remote sensing, military surveillance, communications, and space astronomy. Geostationary satellites orbit at 35 900 km/22 300 mi above Earth, taking 24 hours to orbit, so they appear in almost the same part of our sky at all times. They are important for communications, especially satellite television, since fixed dishes can be used at ground stations.
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Re: A-Z of AVIONICS
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Reply #453 on:
08/02/2007 20:21:46 »
T
etralogy (Fallot)
http://www.lpch.org/photos/greystone/ei_0175.gif
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Re: A-Z of AVIONICS
«
Reply #454 on:
12/02/2007 00:15:12 »
U
mbilical
cord
In placental mammals, the umbilical cord is a tube that connects a developing embryo or fetus to its placenta. It normally contains three vessels, two arteries and one vein, buried within Wharton's jelly, for the exchange of nutrient- and oxygen-rich blood between the embryo and placenta. The presence of only two vessels in the cord is sometimes related to abnormalities in the fetus, but may occur without accompanying abnormalities.
[ Invalid Attachment ]
A newborn with umbilical
cord still attached (3 minutes.)
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Re: A-Z of AVIONICS
«
Reply #455 on:
12/02/2007 00:24:52 »
Viagra
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Re: A-Z of AVIONICS
«
Reply #456 on:
12/02/2007 04:35:17 »
W
atch
A watch is a small portable timepiece or clock that displays the time and sometimes the day, date, month and year. In past centuries, these often took the form of pocket watches, which today are seldom carried or worn. In modern usage, watch is usually a contraction of wristwatch, a designation for the most popular style of timekeeping device worn on the wrist.
Because most watches lack a striking mechanism, such as a bell or gong to announce the passage of time, they are properly designated as timepieces, rather than clocks.
Today, the most common type of watch is the wristwatch, worn on the wrist and fastened with a watch strap or watchband, a bracelet made of real or synthetic leather, metal, nylon, or even ceramic. Before the inexpensive miniaturization that became possible in the 20th century, most watches were pocket watches, which had covers and were carried separately, often in a pocket and attached to a watch chain or fob.
Most inexpensive and medium-priced watches used mainly for timekeeping are electronic watches with quartz movements, powered by electricity. Expensive, collectible watches valued more for their workmanship and aesthetic appeal than for simple timekeeping often have purely mechanical movements and are powered by springs, even though mechanical movements are many times less accurate than quartz movements. The most accurate watches have radio-controlled movements that are miniaturized, portable versions of radio clocks (q.v.).
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A wrist watch.....Like you really needed me to tell you that !!!
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Re: A-Z of AVIONICS
«
Reply #457 on:
12/02/2007 06:12:01 »
Xylophone=
A musical percusion instument consisting of a series of wooden bars graduated in length so as to sound the notes of the scale when struck with a small wooden hammer.
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Re: A-Z of AVIONICS
«
Reply #458 on:
12/02/2007 18:29:46 »
Y
o-yo
A yo-yo is a toy consisting of two equally sized and weighted discs of plastic, wood, or metal, connected with an axle, around which string is wound. There is a slip knot at the free end of the string, and, on a properly strung yo-yo, an uncut loop around the axle (known as a looped slip-string) which allows it to spin freely, or "sleep" upon reaching the string's end.
It is played by tying the string's free end around the middle finger, grasping the yo-yo, and then throwing it downwards with a smooth motion. As the axle spins within the loop, a gyroscopic effect occurs, stabilizing the yo-yo on its axis and permitting time to perform a number of movements. By flicking the wrist, the yo-yo can be made to return to the player's hand, with the cord again completely wound into the groove. Generally, any movement or combination of movements which result in the return of the yo-yo to the player's hand in this fashion is considered a trick, although this is not an absolute standard.
Yo-yoing is a popular pastime around the world. Although generally associated with children, it is not uncommon for people who gain a level of proficiency at the sport in youth to continue playing into adulthood. A yo-yo player is referred to as a yo-yoer (most common), yoist, thrower, or simply as a player.
There is no conclusive documented evidence that the yo-yo is derived from, nor even existed in any form intended for use as a weapon. Generating enough force to create a fatal blow with a yo-yo would also be difficult due to the fact that as the toy is reaching the end of the string it is slowing down. This rumour was possibly started by Tom Ives, Duncan's PR man in the 1930's. There is speculation that he created the weapon myth during the 1930's fad for the publicity. Another origin may have been stories of hunters in the Philippines in the 16th century using sharp rocks with strings attached to kill prey from trees. The development of the modern yo-yo began in the Philippines at around this time, which is probably the source of the confusion.
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Do I really need to label this picture ?...Yo do know what they are don't yo ?
«
Last Edit: 12/02/2007 18:32:12 by neilep
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Re: A-Z of AVIONICS
«
Reply #459 on:
12/02/2007 19:07:46 »
Z
ebra fish (Brachydanio rerio)
http://media.popularmechanics.com/images/tb_fish-lg.jpg
Photo by Phil Jones/Medical College Of Georgia
Published in the August 2003 issue of "Popular Mechanics"
Zebra Fish Aid Deaf
Transparent
zebra fish
may hold the clue to restoring hearing for humans who have
lost the hair cells
that stimulate nerves in their auditory system.
Birth defects, disease and some drugs can trigger the loss of the hair on these specialized cells.
In zebra fish, which rely on a similar cell arrangement for balance,
hair cells regenerate
[O8)] if lost, says David J. Kozlowski, a geneticist at the Medical College of Georgia.
He hopes to identify the genes that spur regeneration in zebra fish. Replacing or reactivating hair-growth genes could make it possible to correct hearing loss and balance disorders in humans.
http://www.popularmechanics.com/technology/industry/1287511.html
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Last Edit: 12/02/2007 19:16:26 by iko
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