Tuesday, December 31, 2013
Monday, December 30, 2013
Desalination, desalinization, or desalinisation refers to any of several processes that remove some amount of salt and other minerals from water. More generally, desalination may also refer to the removal of salts and minerals, as in soil desalination.
Water is desalinated in order to convert salt water to fresh water so it is suitable for human consumption or irrigation. Sometimes the process produces table salt as a by-product. Desalination is used on many seagoing ships and submarines. Most of the modern interest in desalination is focused on developing cost-effective ways of providing fresh water for human use in regions where the availability of fresh water is, or is becoming, limited.
Sunday, December 29, 2013
Saturday, December 28, 2013
Friday, December 27, 2013
Thursday, December 26, 2013
In knot theory, the cinquefoil knot, also known as Solomon's seal knot or the pentafoil knot, is one of two knots with crossing number five, the other being the three-twist knot. It is listed as the 51 knot in the Alexander-Briggs notation, and can also be described as the (5,2)-torus knot. The cinquefoil is the closed version of the double overhand knot.The cinquefoil is a prime knot. Its writhe is 5, and it is invertible but not amphichiral.
Wednesday, December 25, 2013
Tuesday, December 24, 2013
Monday, December 23, 2013
Sunday, December 22, 2013
Saturday, December 21, 2013
Kayfabe is often seen as the suspension of disbelief that is used to create the non-wrestling aspects of promotions, such as feuds, angles, and gimmicks, in a similar manner with other forms of entertainment such as soap opera or film.
Friday, December 20, 2013
Thursday, December 19, 2013
Wednesday, December 18, 2013
The Gyrojet is a family of unique firearms developed in the 1960s named for the method of gyroscopically stabilizing its projectiles. Gyrojets fire small rockets, rather than inert bullets, which have little recoil and do not require a heavy barrel to resist the pressure of the combustion gases. Velocity on leaving the tube was very low, but increased to around 1,250 feet per second (380 m/s) at 30 feet (9.1 m). The result is a very lightweight weapon with excellent ballistics.Long out of production, today they are a coveted collector's item with prices for even the most common model ranging above $1,000. They are, however, rarely fired; ammunition, when available at all, can cost over $100 per round.
Tuesday, December 17, 2013
Monday, December 16, 2013
The noun muchacho is like several other Spanish nouns with a human referent. The masculine forms are used when the referent is known to be male, a group of males, a group of mixed or unknown gender, or an individual of unknown or unspecified gender. The feminine forms are used if the referent is known to be female or a group of females.
Sunday, December 15, 2013
Saturday, December 14, 2013
Castanets are a percussion instrument (idiophone), used in Moorish, Ottoman, ancient Roman, Italian, Spanish and Portuguese music. The instrument consists of a pair of concave shells joined on one edge by a string. They are held in the hand and used to produce clicks for rhythmic accents or a ripping or rattling sound consisting of a rapid series of clicks. They are traditionally made of hardwood, although fibreglass is becoming increasingly popular.
Friday, December 13, 2013
Lipofuscin is the name given to finely granular yellow-brown pigment granules composed of lipid-containing residues of lysosomal digestion. It is considered one of the aging or "wear-and-tear" pigments, found in the liver, kidney, heart muscle, adrenals, nerve cells, and ganglion cells. It is specifically arranged around the nucleus, and is a type of Lipochrome.
Thursday, December 12, 2013
Blindfold chess (also known as sans voir) is a form of chess play wherein the players do not see the positions of the pieces or touch them. This forces players to maintain a mental model of the positions of the pieces. Moves are communicated via a recognized chess notation.
Blindfold chess was considered miraculous for centuries, but it is now accepted that any strong player today can play blindfolded, and many can keep track of more than one simultaneous blindfolded game. In simultaneous blindfold play, an intermediary usually relays the moves between the players.
Wednesday, December 11, 2013
Tuesday, December 10, 2013
A citharede (Greek: κιθαροιδός, Latin: citharoedus; British English citharoede) or, in modern usage, citharist, refers to a classical Greek professional performer of the cithara (or sometimes lyre), especially one who used the cithara to accompany singing. Famous citharedes included Terpander and Arion.
"Citharede" was also an epithet of Apollo (Apollo Citharede), and the term is used to refer to statues which portray Apollo with his lyre.
Monday, December 9, 2013
Sunday, December 8, 2013
Saturday, December 7, 2013
Friday, December 6, 2013
In physiology and medicine, hypovolemia (also hypovolaemia) is a state of decreased blood volume; more specifically, decrease in volume of blood plasma. It is thus the intravascular component of volume contraction (or loss of blood volume due to things such as hemorrhaging or dehydration), but, as it also is the most essential one, hypovolemia and volume contraction are sometimes used synonymously.
Thursday, December 5, 2013
The euphonium is a conical-bore, tenor-voiced brass instrument. It derives its name from the Greek word euphonos, meaning "well-sounding" or "sweet-voiced" (eu means "well" or "good" and phonos means "of sound", so "of good sound"). The euphonium is a valved instrument; nearly all current models are piston valved, though rotary valved models do exist.
Wednesday, December 4, 2013
Cymatics (from Greek: κῦμα "wave") is the study of visible sound and vibration, a subset of modal phenomena. Typically the surface of a plate, diaphragm, or membrane is vibrated, and regions of maximum and minimum displacement are made visible in a thin coating of particles, paste, or liquid. Different patterns emerge in the exitatory medium depending on the geometry of the plate and the driving frequency.
The apparatus employed can be simple, such as a Chladni Plate or advanced such as the CymaScope, a laboratory instrument that makes visible the inherent geometries within sound and music.
Tuesday, December 3, 2013
In rhetoric, litotes is a figure of speech in which understatement is employed for rhetorical effect when an idea is expressed by a denial of its opposite, principally via double negatives. For example, rather than saying that something is attractive (or even very attractive), one might merely say it is "not unattractive."
Litotes is a form of understatement, always deliberate and with the intention of emphasis. However, the interpretation of negation may depend on context, including cultural context. In speech, it may also depend on intonation and emphasis; for example, the phrase "not bad" can be said in such a way as to mean anything from "mediocre" to "excellent."
The use of litotes appeals specifically to certain cultures including the northern Europeans and is popular in English, Russian, and French. They are features of Old English poetry and of the Icelandic sagas and are a means of much stoical restraint.
e.g. not bad means good.