|
Access control is really a system enabling authorities to regulate access to areas and resources in the given physical facility or computer-based information system. Access control is, the truth is, perhaps the most common, everyday phenomenon. For example, a lock on the car door is actually a kind of access control. The PIN over a bank's ATM product is another type of access control. Even nightclub bouncers, browsing front of an door, are another example of (perhaps) a much more primitive mode of access control. Using an access control mechanism is vital when persons attempt to secure confidential, important, or sensitive information and equipment.
Designed by Shandong High Speed Croup, from the was were only available in December 2006 and finished in December 2010, after 14 years of planning researches since 1993, which employed 30,000 workers to develop, and used 450,000 tons of steel and a couple of.3 million cubic meters of concrete, using a total investment of approximately 9 billion yuan. The open from the bridge will decrease traffic time from Qingdao to Huangdao District by at least twenty minutes and release pressure about the Jiaozhou Bay Expressway. Furthermore, the Qingdao Haiwan Bridge will be the starting area of national expressway from Qingdao to Lanzhou and also the key part of high way net of Shandong.
The filter adopts high - strength wedge-shaped strainer to control the automatic cleaning of filter element through pressure differential control. When the impurity accumulates in the filter surface causes the import and export pressure difference to increase to the set value, or the timer reaches the preset time, the electric control box sends out the signal to drive the anti-flushing mechanism. When backwash suction dish and filter imports are pair, the drain valve is opened, the system pressure drainage, chuck and filter the inside a relative pressure below the filter of the lateral pressure of negative pressure zone, forcing some net circulating water from the inside filter lateral flow filter, adsorption on the inner wall of the filter in the impurity particles with flow into ç©£ disc and is discharged from the drain valve. The specially designed filter causes the inside of the filter to produce a jet effect, and any impurities will be washed away from the smooth inner wall. When the pressure difference of the filter is returned to normal or the timer set time is finished, the material does not break the flow during the whole process, and the anti-washing water consumption is low, which realizes the continuous and automatic production
New Car Buying Tips--



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