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We may or might not exactly be aware of it but power generation, transmission and distribution is a commercial activity like any other manufacturing or service industry. Of course due to the very nature in the product, it appears under essential services which can be regulated closely by the government in many countries. Still the main motive of companies working with power generation and distribution would be to earn profit by selling that electricity. In this article we are going to find out about the meaning of tariff along with the several types of expenses associated with power generation.
The rapid development of air filters is closely related to the development of military industry and electronic industry. In the first world war, the use of various chemical agents, asbestos fibre filter paper as the smoke filter layer of military gas masks came into being. The glass fiber filter medium is used in air filtration to obtain a patent in the United States in October 1940. In the 1950s, the United States studied the production process of glass fiber filter paper, and the air filter was improved and developed. In the 1960s, HEPA filters came out; In the 1970s, the filter paper of fine glass fiber was used as the HEPA filter of filter medium, and the filtration efficiency of particle size of 013 micron particle diameter was 99.9998%. Since the eighty s, with the emergence of new test method, use evaluation to improve and to improve the filtering performance requirements, found the HEPA filter there is a serious problem, and he had a higher ULPA filter performance. Countries are still working on it and expect more advanced air filters soon
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