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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
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The Red Baron airplanes manufactured by Albatros evolved steadily throughout World War I. The first plane flown by Richthofen was an Albatross C.III, a two-seat general use biplane that's eventually stated in larger numbers than any C series Albatros. It was used for photo-reconnaissance, bomber escort, and light-weight bombing, which is the plane that Richthofen trained as being a pilot in.
If the team can provide the team members with an opportunity to fully display and express their talents, then this will bring the innovation ability that will never be exhausted for the team! It is true that the core of team spirit is cooperation, emphasizes the team together, pay attention to the overall superiority, away from the personal heroism, but the pursuit of convergence inevitably lead to the result of the team members' personality is distorted and annihilation, create and personality play without individuality, means no creation, this team only simple replication, rather than continuous innovation ability.
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