Thursday, March 29, 2007

Video Camera
A professional video camera (often called a "television camera"
even though the use has extend) is a high-end tool for video
recording electronic moving images (as opposed to a film camera,
that records the images on film). Formerly developed for use in
television studios, they are now normally used for corporate and
educational videos, music videos, direct-to-video movies, etc.
Not as much of advanced video cameras used by customers are
often referred to as camcorders.
There are two kind of professional video cameras: High end
portable, video recording cameras (which are, confusingly,
called camcorders too) used for ENG image gaining, and studio
cameras which lack the recording capability of a camcorder, and
are often fixed on studio pedestals.
Professional video cameras confine and transfer two dimensional
images serially, at specified capture rates, usually in the
visible range of the electromagnetic spectrum.
Most studio cameras situate on the floor, usually with pneumatic
or hydraulic mechanisms to regulate the height, and are usually
on wheels

Friday, March 23, 2007


The telephone or phone (Greek: tele = far away and phone = voice) is a telecommunications device to transmits and receives sound (most commonly voice and speech) through great distances. Most telephones function by means of electric signals over a complex public switched telephone network of equipment which allows almost any phone user to speak to almost any other.
Until relatively recently the word telephone could generally be assumed to refer to a landline phone. Now, cordless telephones and cell phones have become sufficiently common that no such presumption can be made. There are four principal means by which telephone signals are transmitted: throughout a traditional landline which uses physical dedicated wire connections; wireless or Radiotelephony, which transmits messages using either analog or digital radio signals; satellite telephones which bounce signals off of telecommunications satelites; and voice over internet protocol (VOIP) telephones, which use broadband internet cables.
The electric telephone is recognized to various inventors. The actual history is a subject of complex dispute. Among others Antonio Meucci, Philip Reis, and Alexander Graham Bell are all credited with inventing.

Monday, March 19, 2007


Film is a term that encompasses motion pictures as individual projects, as well as the field in general. The source of the name comes from the fact that photographic film (also called filmstock) has historically been the main medium for recording and displaying motion pictures. Many other terms exist — motion pictures, the silver screen, photoplays, picture shows, flicks — and most commonly movies. Academics and the English-speaking international society prefer to use film or "cinema", due to the colloquial nature of these other terms.
Films are created by recording actual people and objects with cameras, or by creating them using animation techniques and/or special effects. They include a series of individual frames, but when these images are shown quickly in succession, the illusion of motion is given to the viewer. Flickering between frames is not seen due to an effect known as persistence of vision — whereby the eye retains a visual image for a fraction of a second after the source has been removed. Perhaps of more relevance is what causes the perception of motion — a psychological effect known as beta movement.

Tuesday, March 13, 2007


Beauty in nature is a general theme in modern life and in art, and books emphasizing beauty in nature fill large sections of libraries and bookstores. That nature has been depicted and famous by so much art, photography, poetry and other literature shows the strength with which many people associate nature and beauty. Why this association exists, and what the association consists of, is studied by the branch of philosophy called aesthetics. Beyond certain basic characteristics that many philosophers agree about to explain what is seen as beautiful, the opinions are almost endless.Many scientists, who study nature in more specific and organized ways, also share the conviction that nature is beautiful; the French mathematician, Jules Henri Poincaré (1854-1912) said:
The scientist does not study nature because it is useful; he studies it because he delights in it, and he delights in it because it is beautiful.
If nature were not beautiful, it would not be worth knowing, and if nature were not worth meaningful, life would not be worth living. Of course I do not here speak of that beauty which strikes the senses, the beauty of character and of appearance; not that I undervalue such beauty, far from it, but it has not anything to do with science; I mean that profounder beauty which comes from the harmonious order of the parts and which a pure intelligence can grasp.
A general classical idea of beautiful art involves the word mimesis, the imitation of nature. Also in the realm of ideas about beauty in nature is that the perfect is indirect through symmetry, equal division, and other perfect mathematical forms and notions.

Thursday, March 08, 2007


A mirror is an object whose surface has good specular reflection; that is, it is smooth sufficient to form an image. The most common type of mirror is the plane mirror, which has a flat surface. Curved mirrors are also used, to produce magnified or demagnified images or focus light.
The most common use of mirrors is for personal hygiene. However, mirrors are also used in scientific apparatus such as telescopes and lasers, as well as industrial machinery. Most mirrors are designed for visible light, however, mirrors intended for other wavelengths of electromagnetic radiation are also used, particularly in optical instruments.

Sunday, March 04, 2007

The Leaning Tower of Pisa

The Leaning Tower of Pisa (Italian: Torre pendente di Pisa) or simply The Tower of Pisa (La Torre di Pisa) is the campanile, or self-supporting bell tower, of the cathedral of the Italian city of Pisa. It is situated behind the Cathedral and it is the third structure in Pisa's Campo dei Miracoli (field of Miracles).
Although planned to stand vertically, the tower began leaning to the southeast soon after the onset of construction in 1173 due to a poorly laid foundation and loose substrate that has permitted the foundation to shift.
The height of the tower is 55.86 m (183.27 ft) from the ground on the lowest side and 56.70 m (186.02 ft) on the highest side. The width of the walls at the base is 4.09 m (13.42 ft) and at the top 2.48 m (8.14 ft). Its weight is estimated at 14,500 tonnes. The tower has 294 steps.
The Tower of Pisa was a work of art, performed in three stages over a period of about 174 years. Construction of the first floor of the white marble campanile began on August 9, 1173, a period of military success and prosperity. This first floor is enclosed by pillars with classical capitals, leaning against blind arches. Today, it is still unscarred from centuries of weather and age.