Biyernes, Hulyo 29, 2011

Different Types of Computers

Tuesday, July 26, 2011

Different Types of Computers

Computers may be classified according to their features and uses.Many people chose computers depending on their needs. Given below are the different types of computers:

TYPES OF COMPUTERS
Supercomputers- the fastest computer and is used in science-related areas because of its unique appplications
Mainframe Computers- this very expensive and large computer can support up to thousands of users at th esame time.
Minicomputer- this is a medium-power computer that stands between a standard personal computer and a mainframe.
Workstation-this type is commonly used for desktop publication, engineering applications and other areas that need a moderate amount of computing power and high graphics quality.
Personal computer- as the name suggests, a personal computer is designed for personal use.

TYPES OF PERSONAL COMPUTERS
Tower model- this model refers to a computer whose power supply, motherboard and mass storage devices are stacked on top of each other
Desktop model- a computer which is designed to fit comfortably on the top of a desk.
Portable computer-computers small enough to be carried

TYPES OF PORTABLE COMPUTERS
Notebook Computer- lightweight personal computer that is small enough to fit in a briefcase
Subnotebook Computer-compared to the notebook computer, it is has smaller keyboard and screen and lighter and smaller.
Laptop computer- one of the most popular types of portable computers due to its features that are equal or close to those of desktop computers

HAND-HELD COMPUTERS
Palmtop- it can literally fit into your palm
Personal Digital Assistant(PDA)- a handheld device that combines computing, telephone/fax and networking features.This also function as a cellular phone, fax sender and personal organizer.
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History of Computers

Tuesday, July 26, 2011

History of Computers

HISTORY OF COMPUTERS
Computers help us a lot in many ways. We make use of them especially when we need something to be done efficiently, like our homeworks and projects. We also learn how to mingle and make friends through social networking sites like Facebook and Twitter. How wonderful is the world of technology....

Who invented the computer? Actually, there is no particular inventor who made this masterpiece, since a lot of inventors contributed their own inventions of computers through the ages. Here are a few of the early computers:

ABACUS- the first computers; used for simple operations
NAPIER'S BONE- this tool is made up of multiplication tables inscribed in a wood or bone.
SLIDE RULE- a single straight two-foot long ruler plotted with a logarmithic scale.

Manual Mechanical Computers
PASCALINE- first operational calculating machine that could add large numbers
STEP RECKONER-a device that could add, subtract, multiply, divde and get square roots.
DIFFERENCE ENGINE-automatically calculated mathematical tables, such as logarithmic and trigonometric tables. Charles Babbage called this machine a "computer"
ANALYTICAL ENGINE- not only able to perform calculations but also to store data in the memory and perform logical comparison.

Electromechanical Computer
HOLLERITH'S TABULATING MACHINE- this machine was able to represent, read and assemble data

Electronic Computers
MARK 1- could execute operations in a short period of time
ENIAC or Electronic Numerical Integrator and Computer- made up of vacuum tubes; used to process one problem at a time
UNIVAC or Universal Automatic Computer-it is the first commercially available computer that could perform about 1,905 operations per second running on a 2.25 Megahertz clock
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Environmental Scanning Powerpoint Presentation

Environmental Scanning Power Point Presentation

Common part of strategic analysis; There are internal elements and external elements ... SWOT Strategic Matrix. S-O strategies are strategies that build on ...
www.slideworld.com/slideshows.../Strategic-Planning-Environmental-Scanning-ppt-666228 - Naka-cache - Katulad
Binisita mo ang pahinang ito noong 7/21/11.
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Wednesday, June 15, 2011

HISTORY OF AIR CONDITIONER

The development of refrigeration started in the early days with the need to preserve foods. Foods that are kept at room temperature spoil easily due to the growth of bacteria. At temperature below 4'C, the growth of bacteria is reduced rapidly. As a result of the development in food refrigeration, other applications follow which include air conditioning. The commercially available of air conditioning applications started based on the need to cool air for industrial processes than for personal comfort.

The first electrical air conditioning was invented by Willis Haviland Carrier in the year 1902. He was also known as the Father of Modern Air Conditioning. His invention was designed to improve the manufacturing process of a printing plant, the process were made more efficient as the paper size and the ink allignment were consistently maintained.

The Carrier Air Conditioning company of America was established by him to meet the demand to better productivity in the workplace. Today, Carrier Corporation is the biggest air conditioner manufacturer and marketing corporation in the world in central air conditioning.

The discovery of freon in 1928 by Thomas Midgley, Jr., a safer refrigerant to humans compared to the toxic and flammable gases such as ammonia, propane and methyl chloride sparks the invention of air conditioning systems for residential, industrial and commercial applications.

Unfortunately, the use of CFC and HCFC refrigerants are causing the depletion of ozone layer in our atmosphere that is causing harmful rays to penetrate our earth. Newer ozone friendly refrigerants have been developed to replace refrigerants such as R-11, R-12 and R-22 to name a few. Non-ozone depletion refrigerant such as R-410a has been used in newer air conditioning systems.
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