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General Science
General Science
A-Z of AVIONICS
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A-Z of AVIONICS
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Re: A-Z of AVIONICS
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Reply #760 on:
19/07/2007 03:36:26 »
Da Vinci
(T-Shirt)
As I have never enjoyed the luxury of a naked Scientist T Shirt I managed to procure this Da Vinci T Shirt (as worn by yours truly) in Florence !
I have been there recently...did I mention it ?
Notice how Da Vinci copied the TNS Logo !!
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Reply #761 on:
19/07/2007 03:52:48 »
Yes That is a very cool Shirt! I hope you had loads of fun!
HEY WE POSTED AT THE SAME TIME WHEN YOU CHANGED YOUR PICTURE AND THE SITE SUCKED MY POST AWAY!!! NO FAIR!! CRIMANY!! IT WAS DONE AND BOOM! LOL ARRRRRG!
Evolution..
concept that embodies the belief that existing animals and plants developed by a process of gradual, continuous change from previously existing forms. This theory, also known as descent with modification, constitutes organic evolution. Inorganic evolution, on the other hand, is concerned with the development of the physical universe from unorganized matter. Organic evolution, as opposed to belief in the special creation of each individual species as an immutable form, conceives of life as having had its beginnings in a simple primordial protoplasmic mass (probably originating in the sea) from which, through the long eras of time, arose all subsequent living forms.
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Re: A-Z of AVIONICS
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Reply #762 on:
19/07/2007 04:18:42 »
Faraday, Michael
Feinberg, Gerald
Fermi, Enrico
Feynman digrams
Field Theory
Freund, Peter
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Steven
_______________________________________________________________
In a time of universal deceit - telling the truth is a revolutionary act.
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Re: A-Z of AVIONICS
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Reply #763 on:
19/07/2007 08:05:56 »
Galvanism =
Electricity produced by a chemical action. 2. A direct electrical current used to stimulate nerves and muscles.
You will find more through wiki
http://en.wikipedia.org/wiki/Galvanism
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H
abit
, an act acquired by experience and performed regularly and automatically. Habits include mannerisms, such as moving the hands when talking; satisfying psychological cravings such as smoking or overeating; and even characteristic reading preferences, such as a regular diet of horror novels or Shakespearean tragedies. Psychologists are interested in habits because of their function as a basic element of learning and as problems to be treated when they prove disruptive to a person's well-being.
Psychoanalysts consider habits as expressions of erotic and aggressive impulses. Repressed, these impulses find an outlet through the counter-productive, repetitive behaviour that comprises habits. In contrast, American psychologist and learning theorist Clark Hull defined habit with great precision in terms of the laws of conditioning and reinforcement. A majority of contemporary psychologists view habits as learned or conditioned behaviour over which one has little voluntary control. Some theorists even consider more complex but commonly practised human activities, such as playing football or speaking French, as composed of “habit hierarchies”.
Habits may begin as reactions to a major event, such as a bodily injury, and then continue on other occasions that reproduce certain cues or stimuli from the original event. A habit is influenced not only by elements that produce the behaviour but also by rewards or punishments that follow it. An action that is lavishly rewarded as soon as it is performed is well on its way to becoming a habit. Once a habit is firmly entrenched, it can be sustained by cues different from those that originally created it, and it need not be rewarded so regularly or well. Indeed, the habit may become its own reward.
Psychologists can effectively assist people in breaking such habits as hair and eyebrow pulling, fingernail biting, shoulder jerking, scratching, overeating, smoking, drinking, and exhibitionism. With children, self-destructive habits such as head banging can be eliminated by behaviour modification or counterconditioning techniques. These involve increasing one's awareness of the act, interrupting its performance so that it no longer seems such a natural thing to do, and reinforcing another act as a competitor. Recognizing the social benefits of breaking an undesirable habit makes doing so easier. In the serious mental defect known as obsessive-compulsive disorder, people feel compelled to repeat actions such as washing hands or switching off lights and appliances.
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Re: A-Z of AVIONICS
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Reply #765 on:
19/07/2007 11:53:31 »
Invar
From Wikipedia, the free encyclopedia
Invar variation due Ni percentage
Invar, also called FeNi, is an alloy of iron (64%) and nickel (36%) with some carbon and chromium. This alloy is known for its unique properties of controlled coefficient of thermal expansion (CTE). It was invented in 1896 by a Swiss Charles Edouard Guillaume, who later received the Nobel Prize in Physics in 1920.
Due to its low coefficient of thermal expansion at room temperature (about 10-6 K-1 in length; some formulations have negative thermal expansion, NTE) it is used in precision instruments (clocks, physics laboratory devices, seismic creep gauges, shadow-mask frames,[1] valves in motors, antimagnetic watches, etc.) However, it has a propensity to creep.
Although Invar is today a widely used material in many industries and applications, this is a particular trademark of a French company named Imphy Alloys: this company originates from Aciéries d’Imphy (a small city near Nevers, France) where the alloy was initially industrialised after its invention. The generic reference for Invar® is FeNi36.
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Reply #766 on:
21/07/2007 18:04:29 »
J
abir
(c. 721-c. 815), Arabian alchemist.
Born Abu Musa Jabir ibn Hayyan, he is supposed to have lived in Al Kūfah and Baghdad (both now in Iraq). More than 500 treatises have been ascribed to him. Contemporary scholars, however, believe that most of these works date from the 9th to the 12th century. In addition, several works printed in Latin and ascribed to Geber, which is the Latin transcription of his Arabic name, probably date from the 14th century. These works give detailed descriptions of chemical processes, including experiments on the properties of metals. They develop the theory—of great importance to medieval and Renaissance scholars—that all metals are composed of mercury and sulphur and that it is possible to transmute base metals into gold.
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Re: A-Z of AVIONICS
«
Reply #767 on:
21/07/2007 18:12:49 »
Kraner did his Science Fair..Just Messing..
Kashiwazaki-Kariwa Nuclear Power Plant
The Kashiwazaki-Kariwa Nuclear Power Plant (柏崎刈羽原子力発電所, Kashiwazaki-Kariwa genshiryoku-hatsudensho?, Kashiwazaki-Kariwa NPP) is a relatively modern nuclear power plant located in the towns of Kashiwazaki and Kariwa in the Niigata Prefecture, Japan (coordinates: 37° 25' 35" N, 138° 35' 40" E). It is owned and operated by The Tokyo Electric Power Company, which is the 3rd largest electric utility in the world.
By net electrical power rating, it is the largest nuclear plant in the world, with a total output of 8,212 MW. This is sufficient to provide electricity to about 16 million households. Since there are some 47 million households reported by the Japanese census (see Demography of Japan), this makes the Kashiwazaki-Kariwa NPP an extremely important cornerstone in the electricity market of Japan.
Furthermore, this gives the KK NPP the title of the 4th largest electric generating station in the world, behind 3 hydroelectric plants:
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Reply #768 on:
21/07/2007 19:11:38 »
L
oach
, common name for any of about 200 species of freshwater elongated fishes of the carp order. Usually found at the bottom of streams and lakes, loaches occur in southern and Central Asia; several species are found in Europe, north-eastern Africa, and Ethiopia. Loaches reach a maximum length of about 30 cm (12 in). Their bodies have few, if any, scales. Three to six pairs of barbels (“whiskers”) are clustered about the mouth. The stone loach is a common European species used as food. The spined loach is found from Europe to Japan and has a collapsible spine between and slightly below its eyes. Two related Asian families are known as suckerbelly loaches and hillstream loaches.
Scientific classification:
Loaches make up the family Cobitididae of the order Cypriniformes. The stone loach is classified as Noemacheilus barbatulus and the spined loach as Cobitis taenia.
Some Loaches chillin !!
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Re: A-Z of AVIONICS
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Reply #769 on:
21/07/2007 20:48:51 »
Mr. J, our Science Teacher that taught be lots!
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Re: A-Z of AVIONICS
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Reply #770 on:
23/07/2007 12:36:39 »
Nucleic Acid =
From Wikipedia, the free encyclopedia
To read more extensively see:
http://en.wikipedia.org/wiki/Nucleic_acid
A nucleic acid is a complex, high-molecular-weight biochemical macromolecule composed of nucleotide chains that convey genetic information. The most common nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). Nucleic acids are found in all living cells and viruses.
Artificial nucleic acids include peptide nucleic acid (PNA), Morpholino and locked nucleic acid (LNA), as well as glycol nucleic acid (GNA) and threose nucleic acid (TNA). Each of these is distinguished from naturally occurring DNA or RNA by changes to the backbone of the molecule.
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Re: A-Z of AVIONICS
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Reply #771 on:
23/07/2007 22:28:24 »
O
ak Bark
The bark of many species of oak, including that of the common oak, provide tannin, which is used for curing leather and for making blue-black ink.
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Re: A-Z of AVIONICS
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Reply #772 on:
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( Really, I did not know that about an oak! Cool )
Pirite (synonym of Pyrite)=
Ambasaguas (Ambas Aguas; Ambas-Aguas), Muro de Aguas, La Rioja, Spain
© 2002 John H. Betts
Show Pyrite Photos (1279)
Formula:
FeS
2
System: Isometric Colour: Pale brass-yellow
Hardness: 6 - 6½
Name: Named in antiquity from the Greek "pyros" for "fire" because sparks flew from it when hit with another mineral or a metal.
Pyrite Group
Pyrite is a very common mineral, found in a wide variety of geological formations from sedimentary deposits to hydrothermal veins and as a constituent of metamorphic rocks. The brassy-yellow metallic colour of Pyrite has in many cases lead to people mistaking it for Gold, hence the common nickname 'Fools Gold'. Pyrite is quite easy to distinguish from Gold, it is much lighter, but harder and cannot be scratched with a fingernail or pocket knife.
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Re: A-Z of AVIONICS
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Reply #773 on:
30/07/2007 03:10:26 »
Quails.
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Re: A-Z of AVIONICS
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Reply #774 on:
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R
igel
.............. is the brightest star in the constellation Orion and the seventh brightest star in the sky, with visual magnitude 0.12. Although it has the Bayer designation "beta", it is almost always brighter than Alpha Orionis (Betelgeuse). It also has the alternative traditional names Algebar or Elgebar, but these are almost never used.
The star's name comes from its location at the "left foot" of Orion. It is a contraction of Riǧl Ǧawza al-Yusra, this being Arabic for "Left Foot of the Central One". Another Arabic name is الرجل الجبار ar-riǧl al-ǧabbār, "the foot of the great one" (giant, conqueror, etc.), which is also the source of the variant name Algebar.
It is known as 参宿七 (Shēnxiù Qī, "The Seventh of the Three Stars") in Chinese. The mathematically questionable name is due to the fact that the Asterism of Three Stars was originally composed of just three stars, all of them in the girdle of the Orion. Later, four more stars were added to this asterism, but the name remained unchanged.
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Re: A-Z of AVIONICS
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Reply #775 on:
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Sagitta
Abbreviation:
Sge
English name:
Arrow
Coordinates
see Stellar data
Particulars:
* Double star zeta Sge
* Recurrent Nova WZ Sge
* Globular cluster M 71
General:
A very small constellation lying south of the Fox, Vulpecula, and north of the Eagle, Aquila. As a matter of fact Sagitta is the third smallest constellation in the sky. It shows clearly the shape of an arrow flying towards the Swan, Cygnus.
Stars and other objects
The A3 main sequence star zeta Sge (5.00 mag) has a 9th mag companion. Small telescopes can resolve this pair.
WZ Sge is a nova which lightens up from time to time from 15th mag to 7th mag. It has been observed twice in this century: in 1913 and in 1946. Further outbursts may occur at any time.
In binoculares and small telescopes the globular cluster M71 appears as a misty patch of a sperical shape. Although it is nowadays classified as a globular cluster some authorities still refer to it as open star cluster. See the Messier database for details.
Mythological Background:
Sagitta is thought to be the arrow shot by Hercules as he is hunting the two birds, Aquila and Cygnus. But it seems that the had luck and escaped.
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Re: A-Z of AVIONICS
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Reply #776 on:
30/07/2007 15:27:21 »
Tyrannosaurus Rex! Everyone knows that's the worlds most known dinosaur!
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U
nicode
.............is an industry standard allowing computers to consistently represent and manipulate text expressed in any of the world's writing systems. Developed in tandem with the Universal Character Set standard and published in book form as The Unicode Standard, Unicode consists of a repertoire of about 100,000 characters, a set of code charts for visual reference, an encoding methodology and set of standard character encodings, an enumeration of character properties such as upper and lower case, a set of reference data computer files, and rules for normalization, decomposition, collation and rendering.[1]
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Reply #778 on:
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Vortex
From Wikipedia, the free encyclopedia
Jump to: navigation, search
For other uses, see Vortex (disambiguation).
Vortex created by the passage of an aircraft wing, revealed by coloured smoke
Vortex created by the passage of an aircraft wing, revealed by coloured smoke
A vortex (pl. vortices) is a spinning, often turbulent, flow (or any spiral motion) with closed streamlines. The shape of media or mass swirling rapidly around a center forms a vortex. It flows in a circular motion.
Contents
[hide]
* 1 Dynamics
* 2 Two types of vortex
o 2.1 Free (irrotational) vortex
o 2.2 Forced (rotational) vortex
* 3 Observations
o 3.1 Instances
* 4 See also
* 5 References and further reading
* 6 External links
[edit] Dynamics
A vortex can be any circular or rotary flow that possesses vorticity. Vorticity is a mathematical concept used in fluid dynamics. It can be related to the amount of "circulation" or "rotation" in a fluid. In fluid dynamics, vorticity is the circulation per unit area at a point in the flow field. It is a vector quantity, whose direction is (roughly speaking) along the axis of the swirl. Also in fluid dynamics, the movement of a fluid can be said to be vortical if the fluid moves around in a circle, or in a helix, or if it tends to spin around some axis. Such motion can also be called solenoidal. In the atmospheric sciences, vorticity is a property that characterizes large-scale rotation of air masses. Since the atmospheric circulation is nearly horizontal, the (3 dimensional) vorticity is nearly vertical, and it is common to use the vertical component as a scalar vorticity.
Mathematically, it is defined as,
\vec \omega = \nabla \times \vec \mathit{u}
where \vec \mathit{u} is the fluid velocity.
The properties of vorticity in 2 and 3 dimensions are treated in some depth in George Batchelor's famous textbook (ch 5 & ch 7 et seq.). Of particular importance in practical situations is the intensification of vorticity which takes place in three dimensions when a vortex-line is extended (p270 et seq).
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Re: A-Z of AVIONICS
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Reply #779 on:
01/08/2007 21:37:43 »
Watermelon!
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