LED Light Emitting Diode

The ledes are used as indicators and in many lighting devices. The first ledes emitted low-intensity red light, but modern devices emit high brightness light in the infrared, visible and ultraviolet spectrum.

Because of their ability to operate at high frequencies, are also useful in advanced communications technologies and control. Infrared ledes also used in remote control units of many commercial products including audio and video.

Features

Ways to determine the polarity of a LED insertion [edit]
There are three main ways of knowing the polarity of a LED:

The longest leg will always be the ánodo.3
On the cathode side, the base of the LED has a flat edge.
Within the led, the board indicates the anode. Can be recognized because it is smaller than the anvil, indicating the cathode.

Advantages

The ledes present many advantages over incandescent light sources and fluorescent, such as low power consumption, a longer life, reduced size, vibration resistance, low heat emission, no mercury (which when exposed in the environment is highly harmful) compared with fluorescent technology, not create high magnetic fields and magnetic induction technology with higher residual radiation which is created for the human being; They reduce noise on power lines are special for use with photovoltaic (solar panels) compared to any other current technology; not affected by the intermittent illumination (ie can function as strobe lights) and this does not reduce its average life, you are special to systems antiexplosion because they have a strong material, and in most colors (except blue ledes ), have a high level of reliability and durability.

Starting time

The ledes have the advantage of a very short power (less than 1 millisecond) compared with high-powered lights such as luminaires high intensity sodium vapor, metal halide, halide or halogenated and other systems incandescent technology.

Variety of colors

Ledes1 different colors.

The great variety of colors that occur ledes has allowed the development of new electronic displays monochrome text, bicolor, tricolor and RGB (full color displays) with the ability to playback video for advertising, informational or signaling purposes.

Computer Practice And Theoretical Computer Science

There are fringe people who confuse the computer with vocational areas that typically involve the use of application software and which include the simple use of programs for the office, surfing the web or gaming. The computer instead sees text editor, browser, and video games as mere tools for work or leisure. What is interesting, in computing pure, is not knowing how to use the so-called application for how they present themselves, but rather to understand, for example, through the analysis of the source code, structure and possibly knowledgeable improve with the use of algorithms efficient under different criteria (memory usage, number of instructions, parallelism, ...).

In universities there are departments and Science courses. A computer should always have a genuine interest in the theoretical foundations of computer science; which then, by profession or passion, often face the developer of software is possible but, being able to leverage their problem solving skills in various areas, it is not obvious. In any case the computer, at least in its application part, is a discipline strongly oriented to problem solving.

The theoretical foundations of the discipline then descend directly from mathematics (discrete mathematics), to which the computer is closely related, and it is also for this reason that the study of computer science has recently gained attention in the multidisciplinary try to clarify or justify processes and complex systems of the real world, such as the ability of the human brain to generate thoughts from molecular interactions (studies belonging to bioinformatics).

In particular, the computer goes into several smaller fields: the study of formal languages ​​and automata, which also covers the compilers; the study of the computational complexity, especially for minimizing the number of instructions to be executed for the resolution of a problem and the search for approximate algorithms for solving NP-hard; Cryptology, the science that studies the methods to make a message incomprehensible to anyone who is not in possession of a key to the message itself; the theory of codes, used for data compression or to increase the integrity of the data; operations research, to provide mathematical tools to support decision-making activities; computer graphics, divided in turn into bitmap graphics and vector graphics; quoting only certain subfields.

Telecommunications

The foreign word "telecommunications" belonging German word is telecommunications. However, it is used since the mid-1990s practically only to military facilities and civil protection (civil protection has recently been often of "information and communication" (ICT), speaking) and is almost completely disappeared in the vernacular, as particularly the Use this field operating companies, the word "telecommunications".

In a narrower sense is understood as a data exchange using electrical engineering, electronics, wireless technology and other technology transfer of modern telecommunications today. The first telecommunication services in this sense were called telegraph (telex) and telephony, and remote signaling. Before the advent of computers, there were already designated as telecontrol data transmission services to control plants.

"Telecommunications is the technical process of sending, transmitting and receiving signals by means of telecommunications;" For the purposes of this definition also therefore also radio and TV (analogue and digital), fax, mobile telephony and the Internet and many examples in which also the German lawmakers defined in the Telecommunications Act and used in other legal norms notion of telecommunications.

Telecommunications equipment "technical devices or systems that send messages identifiable as electromagnetic or optical signals that carry, convey, receive, control or can control."telecommunication facilities are now a fundamental part of the infrastructure. For this reason, in order to avoid their spatial disparities providing a common task of spatial development (ie, in practice, a state task). Since the beginning of liberalization (in Germany since 1998) Telecommunications services are provided in competition, primary care is provided by a universal service obligation.

Graphic Designers

Graphic designer is a professional who works in the field of visual communication. His work is mainly to create visual objects, intended to be printed, published or transmitted via electronic media in order to communicate a message to the public in the most simple and effective, through text and images.

The primary responsibility of a graphic designer is the arrangement of items in the most simple and functional as possible. It is also able to take personal responsibility for design and art direction and to provide technical advice at all stages of the creation of a product.

Graphic designers are professionals in several disciplines, are communication experts, and often are also photographers, printers, web designers. They can work in various environments: in professional studios, advertising agencies, in the offices of the graphical editors of newspapers or magazines, publishing houses or domestic companies, or as a freelancer, working with agencies, companies or individual clients.

Types Of Computer

Central unit and personal computers

The modern general purpose personal computers have always UNIA Central. And because, thanks to the advent of microelectronics, today the level of integration of logical and functional components of the computer is very high (so hardly the processing unit that oversees all the functionality of the computer is a hardware lock him). And because, even when all the main hardware components of the personal computer constituting a single block, the personal computer is always equipped with several ports for connecting external devices (such as the printing unit, the disk drive, the modem, etc.) optional (ie not included in the sales package of the personal computer).

Central unit and desktop computer 

In desktop computers the central unit includes most of the major components of the logical-functional computer and the power supply. Excluded external devices not essential to the operation of the computer such as the printer or monitor audio. If the computer is not a computer all-in-one, the central unit does not include either the main user interface output, the display, which is inserted in a separate block: the video monitor. If it is an all-in-one computer, the display is also included in the central unit. The main user interface input, the keyboard, it can either be a separate block, is to be included in the central unit (such as in the home computer). The mouse instead always constitutes a separate block.

CPU and notebook computer

The central unit (left) and the hard disk (right) of a notebook computer
In the notebook computer the central unit includes all major computer hardware. In such computer is referred to as central unit only as a consequence of the fact that they are always equipped with several ports for connecting external devices (usually optional). The central unit is also equipped with autonomous power supply thanks to rechargeable electric batteries integrated in the central unit. In the box of the sale of the notebook computer, usually also includes a power supply. The power supply is a hardware block separate from the main unit and allows, if connected to the mains, supplying power to the computer when the battery power is low, as well as to recharge these batteries.

Central unit and tablet computer 

Even in the tablet computer the central unit includes all major computer hardware.