In mathematics, a matrix (plural matrices) is a rectangular array[1] of numbers, symbols, or expressions, arranged in rows and columns.[2][3] The individual items in a matrix are called its elements or entries. An example of a matrix with 2 rows and 3 columns is

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Care and Safety Procedures for your PC

Summary:



How to take care of your PC
1.Computers must be placed in cool dry and dry places.
2.Cables must be tied together to keep them away from walkways to avoid accidents.
3.Don't eat in front of the computer. Food bits attract insects that can penetrate the hardware and cause malfunctions.
4.Always use AVR too much electricity might cause it to short.
5. Do not bump the computer components.
6. Avoid clutter around your computer. Use soft cloth in cleaning your computer.
7.Always scan for computer viruses. Some connections carry viruses that can damage files.



Ways of taking care for PC:
-You must have a proper workstation design.
-You must have a good working station.



Good working habits
-tap on the keys gently.
-avoid long uninterrupted periods of typing.
-avoid staring at the monitor for too long.


Proper workstation design
-adjustable work station
-well ventilated room
-use document holder to minimize the vertical head movement
-extend-able legs on the keyboard
-place mouse where it easily accessible by your dominant hand
-16 to 24 inches away at the eye level


Health risks:
PC's emit radiation and can cause damage to our health due to prolonged use.So do not use PC frequently so the radiation will not emit to you many times.Use it only when necessary.

History and Types of Computers

History of Computers

The development of the modern day computer was the result of advances in technologies and man's need to quantify. Papyrus helped early man to record language and numbers. The abacus was one of the first counting machines.. Some of the earlier mechanical counting machines lacked the technology to make the design work. For instance, some had parts made of wood prior to metal manipulation and manufacturing. Imagine the wear on wooden gears. This history of computers site includes the names of early pioneers of math and computing and links to related sites about the History of Computers, for further study. This site would be a good Web adjunct to accompany any book on the History of Computers or Introduction to Computers. The "H" Section includes a link to the History of the Web Beginning at CERN which includes Bibliography and Related Links. Hitmill.com strives to always include related links for a broader educational experience. The material was originally divided into Part 1 & Part 2

Home > Referrals > Computers > Types of Computer     Types of Computers The types of computers range from the Hybrid to the Analog types. The computers you come across in the daily course of your day range from laptops, palmtops and towers, to desktop computers, to name a few. But the very word “computers” reminds one of the desktop computers used in offices or homes. Different categories of computes have been devised in keeping with our varied needs. The Types Of Computers: Analog and Hybrid (classification based on operational principle) Analog Computers: The analog computer is almost an extinct type of computer these days. It is different from a digital computer in respect that it can perform numerous mathematical operations simultaneously. It is also unique in terms of operation as it utilizes continuous variables for the purpose of mathematical computation. It utilizes mechanical, hydraulic, or electrical energy or operation. Hybrid computers: These types of computers are, as the name suggests, a combination of both Analog and Digital computers. The Digital computers which work on the principle of binary digit system of “0” and “1” can give very precise results. But the problem is that they are too slow and incapable of large scale mathematical operation. In the hybrid types of computers the Digital counterparts convert the analog signals to perform Robotics and Process control. Apart from this, computers are also categorized on the basis of physical structures and the purpose of their use. Based on Capacity, speed and reliability they can be divided into three categories of computers: 1. The Mainframe Computer – These are computers used by large organizations like meteorological surveys and statistical institutes for performing bulk mathematical computations. They are core computers which are used for desktop functions of over one hundred people simultaneously. 2. The Microcomputer – These are the most frequently used computers better known by the name of “Personal computers”. This is the type of computer meant for public use. Other than Desktop Computer the choice ranges as follows: Personal Digital Computer Tablet PC Towers Work Stations Laptops Hand Held Computer 3. The Mini computer – Mini computers like the mainframe computers are used by business organization. The difference being that it can support the simultaneous working of up to 100 users and is usually maintained in business organizations for the maintenance of accounts and finances. Yet another category of computer is the Super Computers. It is somewhat similar to mainframe computers and is used in economic forecasts and engineering designs. Today life without computers is inconceivable. Usage of different types of computers has made life both smooth and fast paced.

Three Idiots

Rancho is calling someone because there is an emergency.He saw a girl with a motorcycle,he borrow the motorcycle with the girl. They go to a house and brought a sick person into the shospital with the motorcycle. In the hospital his one friend saw his father and because of that he thanked Rancho.the girl fell in love with Rancho and she think that all the characters in the television is Rancho and she think that she is dancing with him. on that morning she go to the hospital and she saw that the three were sleeping so she wake up them because they have an exam. when they go to their exam they were 30 min. late but they take the test. their teacher did not accept their test so when their teacher is arranging the test papers they rumble the test papers and put their test papers to others. After that they went to see the results Rancho's two friends was in the 2 last positions. they taught that Rancho did not pass the test. but the girl saw that Rancho is the top notcher. After that they drink too much alcohols. After many days, the two go to Rancho's house. They saw Rancho's father that is dead. They try to speak with him but they saw different face. They asked him where is their friend but he get his rifle, so they get his father's urn and they said to him that they will flash the ashes  in the toilet. So he tell the truth that he is a true Rancho and the one their friend is their gardener. When the fake Rancho is in the 6th grade the true Rancho always gives his assignment to him for him to answer. When the math teacher saw the fake Rancho solving a 10th grade math, he was to say it to the principle but the true Rancho's father said that he said that he is his son Rancho so he study until college as Rancho
So the true Rancho give the address of the fake Rancho. When the two was on their way to the fake Rancho's house the true Rancho saw that the urn do not have ashes. He was tricked by the two.

powerpoint

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