30/04/2008 by admin.

A backpack (also called book bag, rucksack, knapsack, packsack, pack, Haversack, or Bergen) is, in its simplest form, a cloth sack carried on one’s back and secured with two straps that go over the shoulders, but there can be exceptions. There are many ways to carry backpacks. One way is to carry it in one hand (like a briefcase).

Backpacks are often preferred to handbags for carrying heavy loads, because the shoulders are better suited for bearing heavy weights for long periods of time than the hands. Large backpacks, used to carry loads over 10 kg, usually offload the largest part (up to about 90%) of their weight onto padded hip belts, leaving the shoulder straps mainly for stabilising the load. This improves the potential to carry heavy loads, as the hips are stronger than the shoulders, and also increases agility and balance, since the load rides nearer the person’s own center of mass.

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30/04/2008 by admin.

 Football Trophies

 are a reward for  football achievement, and usually afterwards serves as proof of merit. Football Trophies
 are most often awarded with sporting events. These randrom youth sports through professional level athletics. Often, the reward of the Football Trophies
 is not simply in winning it; rather, those who win it cherish the legacy that also comes with the trophy.

Medals are often given out either instead of or along with Football Trophies
 such as gold medals, silver medals, and bronze medals for in sport

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30/04/2008 by admin.

A bag is used for packaging and/or carrying items. For the latter a bag may have one or two handles; a shoulder bag has a strap to carry it on the shoulder (the bag is either carried on the side of the shoulder carrying it, or the other side). A rucksack has straps to carry it on the back. There is also be a string bag, with two strings which go over the shoulder and can be used as the fastening as well.

A bag may be closable by a zipper, snap fastener, etc., or simply by folding (e.g. in the case of a paper bag). Sometimes a money bag or travel bag has a lock. Sachets may be fabric bags that are filled with pot pourri and tied off with ribbons.

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30/04/2008 by admin.

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29/04/2008 by admin.

A volatile image is one that exists only for a short period of time. This may be a reflection of an object by a mirror, a projection of a camera obscura, or a scene displayed on a cathode ray tube. A fixed image, also called a hardcopy, is one that has been recorded on a material object, such as paper or textile.

A mental image exists in an individual’s mind: something one remembers or imagines. The subject of an image need not be real; it may be an abstract concept, such as a graph, function, or “imaginary” entity. For example, Sigmund Freud claimed to have dreamt purely in aural-images of dialogues. The development of synthetic acoustic technologies and the creation of sound art have led to a consideration of the possibilities of a sound-image made up of irreducible phonic substance beyond linguistic or musicological analysis.

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29/04/2008 by admin.

image sharingIn common usage, an image (from Latin imago) or picture or image sharing is an artifact, usually two-dimensional, that has a similar appearance to some subject—usually a physical object or a person.

Images may be two-dimensional, such as a photograph, screen display, and as well as a three-dimensional, such as a statue. They may be captured by image sharing l devices—such as cameras, mirrors, lenses, telescopes, microscopes, etc. and natural objects and phenomena, such as the human eye or water surfaces.

The word image is also used in the broader sense of any two-dimensional figure such as a map, a graph, a pie chart, or an abstract painting. In this wider sense, images can also be rendered manually, such as byimage sharing  drawing, painting, carving, rendered automatically by printing or computer graphics technology, or developed by a combination of methods, especially in a pseudo-photograph

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25/04/2008 by admin.

In information science

In information science irrelevant or meaningless data is considered to be noise. Noise consists of a large number of transient disturbances with a statistically randomized time distribution.

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25/04/2008 by admin.

Gyrotrons are high powered vacuum tubes which emit millimeter wavelength beams by bunching electrons with cyclotron motion in a strong magnetic field. Output frequencies range from about 20 to 250 GHz, covering wavelengths from microwave to the edge of the terahertz gap. Typical output powers range from tens of kilowatts to 1-2 megawatts. Gyrotrons can be designed for pulsed or continuous operation

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25/04/2008 by admin.

Many Pencils

across the world and almost all in Europe are graded on the European system using a continuüm from “H” (for hardness) to “B” (for blackness), as well as “F” (for fine point). The standard writing Pencils
 are graded HB. According to Petroski this system might have been developed in the early 1900s by Brookman, an English pencil maker. It used “B” for black and “H” for hard; a Pencils
 grade was described by a sequence or successive Hs or Bs such as BB and BBB for successively softer leads, and HH and HHH for successively harder ones.^[11]

Today a set of Pencils
 ranging from a very hard, light-marking pencil to a very soft, black-marking Pencils
 usually ranges from hardest to softest as follows.

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25/04/2008 by admin.

While terahertz radiation is emitted as part of the black body radiation from anything with temperatures greater than about 10 kelvin, this thermal emission is very weak. As of 2004 the only viable sources of terahertz radiation were the gyrotron, the backward wave oscillator (”BWO”), the far infrared laser (”FIR laser”), quantum cascade laser, the free electron laser (FEL), synchrotron light sources, photomixing sources, and single-cycle sources used in Terahertz time domain spectroscopy. The first images generated using terahertz radiation date from the 1960’s; however, in 1995, images generated using terahertz time-domain spectroscopy generated a great deal of interest, and sparked a rapid growth in the field of terahertz science and technology. This excitement, along with the associated coining of the term “T-rays”, even showed up in a contemporary novel by Tom Clancy.

There have also been solid-state sources of millimeter and submillimeter waves for many years. AB Millimeter in Paris, for instance, produces a system that covers the entire range from 8 GHz to 1000 GHz with solid state sources and detectors. Nowadays, most time-domain work is done via ultrafast lasers.

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