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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
Mahindra & Mahindra is the world’s largest multi-utility vehicles manufacturer that has recently announced to create new product platforms as well as Ssangyong Motor Co. inside upcoming several years. Company has acquired 70% shares with the Korea-based Ssangyong Motors this season. As per some reliable official sources Mahindra & Mahindra is planning to launch four to five new electric four-wheelers including Mahindra Reva NXR, a universal SUV plus a 4 meter variant of Mahindra Verito. Mahindra has submitted the Gross revenue of Rs.7294.3 crore using the growth of 20.9%by the finish of June 2011.
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The young dutchman's luck has changed within the last week as Formula 1 headed to Monaco for which is definitely the jewel inside the crown from the F1 season. Verstappen silenced his critics during the 'free practice' sessions about the Thursday prior to the race by driving round the street circuit in the 3rd fastest time. Fellow drivers and race pundits alike praised Max for his pace around a circuit which is incredibly tough to master using its narrow track and tight bends that leave no room for error. But his inexperience showed on race day when he was wanting to overtake Romain Grosjean's Lotus at the Sainte Devote corner and wound up causing a huge collision. Having placed his car in prime position to overtake the Frenchman. Verstappen was caught out when Grosjean braked sooner than expected before the corner and crashed in the rear right wheel of the Lotus. Verstappen's front left suspension broke on impact and his car crashed in to the barrier at substantially more than 100 mph. The Lotus could continue with no obvious damage and fortunately, Verstappen escaped unharmed from the cockpit. Those watching the race continue to exist TV has the best angle around the accident because the live footage on the time was through the onboard camera next to the driver's helmet.
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