Sunday, January 27, 2008

Flexography

Flexography also called surface printing, often abbreviated to flexo, is a method of printing most usually used for packaging labels, tape, bags, boxes, banners, etc... Flexo was pioneered by Barry Pannowitz and Alf Green, and later by Dean Gleeson and Patrick Crouch who worked together in eradicate Moire, the clashing of screen angles.

A flexo print is achieved by creating a mirrored master of the necessary image as a 3D relief in a rubber or polymer material. A measured amount of ink is deposited upon the exterior of the printing plate (or printing cylinder) using an anilox roll. The print surface then rotates; contact the print material which transfers the ink.

Originally flexo printing was basic in quality. Labels require high quality have usually been printed Offset until recently. In the last few years great advances have been made to the superiority of flexo printing presses.

Sunday, January 20, 2008

Cricket

Cricket is a bat-and-ball sport competition by two teams, usually of eleven players each. A cricket match is played on a grass field, approximately oval in shape, in the centre of which is a flat strip of ground 22 yards (20.12 m) long, called a cricket pitch. A wicket, regularly made of wood, is placed at each end of the pitch.

The bowler, a player from the field team, bowls a hard, fist-sized cricket ball from the locality of one wicket towards the other. The ball usually bounces once before feat the batsman, a player from the conflicting team. In defence of the wicket, the batsman plays the ball with a made of wood cricket bat. Meanwhile, the other members of the bowler's team stand in a variety of positions around the field as fielders, players who retrieve the ball in an effort to stop the batsman scoring runs, and if possible to get him or her out. The batsman — if he or she does not get out — may run between the wickets, exchange ends with a second batsman (the "non-striker"), who has been waiting near the bowler's wicket. Each finished exchange of ends scores one run. Runs are also scored if the batsman hit the ball to the border line of the playing area. The match is won by the team that score more runs.

Sunday, January 13, 2008

Infrared

Infrared (IR) emission is electromagnetic emission of a wavelength longer than that of noticeable light, but shorter than that of radio waves. The name means "below red" (from the Latin infra, "below"), red being the color of detectable light of longest wavelength. Infrared radiation spans three instructions of magnitude and has wavelengths between about 750 nm and 1 mm.

These divisions are suitable by the different human response to this radiation: near infrared is the area closest in wavelength to the radiation detectable by the human eye, mid and far infrared are gradually further from the visible regime. Other definitions follow different physical mechanisms (emission peaks, vs. bands, water absorption) and the newest follow technical reasons (The common silicon detectors are sensitive to about 1,050 nm, while Inga As sensitivity starts around 950 nm and ends between 1,700 and 2,600 nm, depending on the specific configuration). Unfortunately the international standards for these specifications are not currently obtainable.

Sunday, January 06, 2008

Multicellular organism

Multicellular organisms are those organisms consisting of more than one cell, and having differentiated cells that achieve specialized functions. Most life that can be seen with the naked eye is multicellular, as are all animals and plants. A group of similarly differentiated cells performing a function in a multicellular organism is known as a tissue. Although some single-celled organisms, such as mycobacteria, have differentiated cells, the differentiation is less dramatic than that usually found in multicellular organisms.

A multicellular organism can work on a number of levels. For instance, a sponge works on a cellular level as the different cells are almost like many separate organisms co-operating jointly for a common goal. This is illustrated by the fact you can put a sponge in a blender and the cells of the sponge will aggregate again to form another sponge. They have no tissues, organs or organ systems which require a higher level of organization. More advanced organisms such as jellyfish, coral and sea anemones work on a tissue level of organization, as their cells can aggregate to form different tissues. For instance, a jellyfish has an outer epidermis and an inner gastrodermis, an example of different tissues to serve a different purpose.