Social Science

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AIR POLLUTION IN DELHI

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The  air quality  in  Delhi , the capital of India, according to a  WHO  survey of 1600 world cities, is the worst of any major city in the world.   Air pollution  in India is estimated to kill 1.5 million people every year; it is the fifth largest killer in India. India has the world's highest death rate from  chronic respiratory diseases  and  asthma , according to the WHO. In Delhi, poor quality air irreversibly damages the lungs of 2.2 million or 50 percent of all children. Causes of poor air quality Motor vehicle emissions  are one of the causes of poor air quality. The  Badarpur Thermal Power Station , a coal-fired power plant built in 1973, is another major source of air pollution in Delhi. Despite producing less than 8% of the city's electric power, it produces 80 to 90% of the  particulate matter  pollution from the electric power sector in Delhi.During the  Great smog of Delhi  in N...
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SYSTEM ANALYSIS AND DESIGN

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SYSTEM ANALYSIS AND DESIGN  The System is a word derived from the Greek word 'Systema' which means an organized relationship  among components. An Information system is an arrangement of people, data, processes, information presentation and information technology that interacts to support and improve day to day operations in business as well as support the problem solving and decision making needs of management and users. DEVELOPMENT OF A SUCCESSFUL SYSTEM   The success of any depends on the approach of building it. If the development approach is right,   the system will work successfully. System Development Life Cycle  SDLC is a standard methodology for the development of an Information System. it mainly consists of  four phases: System Analysis, System Design, System Construction & Implementation, System Support. every phase consists of input, tasks and outputs. System Development Life Cycle .................
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Why do we cry while chopping the onions?

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  Why do we cry while chopping the onions? Ever cut of an onion and started tearing up? Most people do. It turns out when you cut an onion, it releases a gas called,  Propanethiol S-oxide. When mixed with certain enzymes in the onion, it creates a sulfur gas. These gases then get to your eyes and create a mild acid which irritates the eyes. Normally, your body would signal you to close your eyes. This, of course, is not a good idea if you are cutting an onion. The next best thing your eyes can do is to make tears to protect the eyes. Rubbing your eyes is a bad idea, since your hands are likely full of the tear making onion juice. So how do you keep from tearing up? There are many theories out there. I’ve heard some have had luck burning a candle near the chopping site. (Don’t try that without an adult.) Wearing safety goggles, however, should reduce the tears every time. The whole process goes as follows:- Lachrymatory-factor sy...
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