|
Logical security examples include user account management. In order to provide access control to a user, several steps have to be set up to really make it work. It is necessary to make a user account which has a login and password. Special features should be set up here as well. For instance, the login account must uniquely identify the person, nevertheless it should be portion of a typical much like all other logins. Secondly, the password has to be sophisticated. It should be no less than five to ten characters in proportions; it cannot be considered a common password, like 'password"; it ought to have upper and lower case letters and also numbers.
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
SEMEM_SY automatic brush filter is controlled by a motor, electric cabinet, line (including control valves and differential pressure transmitter), executive components, filter components, stainless steel brush, framework components, transmission shaft, import and export of major parts of the connecting flange, etc. Realize remote control to save land area and save manpower and material resources.
New Car Buying Tips--



Copyright ?1998-2017 Technews Corp, All rights reserved
|
