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The IC HV9925 from Supertex Inc. is often a high-efficiency LED driver/controller device furnished with an original PWM switched LED dimming facility. The PWM programming allows you save LED power making the circuit extremely power efficient and longer lasting. The device is specially made for driving the vulnerable high-bright white LEDs from input voltages ranging up to 400 VDC.
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
Of course, repairing a damaged alloy wheel might be tricky. Many think that a cracked or bent wheel can simply be bent back into place, nonetheless it isn't that simple. Fortunately, we of experts carries a method of safely repairing a damaged wheel that may remove even unnoticeable cracks and other weak spots. The wheel is installed on a vehicle simulator, and as heat, pressure and lightweight vibrations are applied to the wheel the alloy moves back in place without cracking. The wheel retains its original strength once it cools. It is also washed thoroughly, since brake dust and rust can hide small cracks. Once the wheel is restored and cleaned, it can be inspected thoroughly by all of us of experts.
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Beijing international automobile exhibition since its inception, the scale expands unceasingly, the exhibition features from the past simple product display, develop to become the enterprise development strategy today distribution and comprehensive image display window; The world's most cutting-edge technology innovation information exchange platform; The most efficient brand promotion stage. The quality of the exhibits has been improved, and the impact is also becoming more and more widespread. Many multinational auto companies have listed the Beijing auto show as the global a-level auto show. Receives exhibits fine and brand, the international exhibition concept and characteristic, the Beijing auto show has become the brand of has higher popularity in the international exhibition, for the development of China's automobile industry, the establishment and development of independent brands play an important role, and to promote exchange and cooperation of Chinese and foreign automobile industry, for the rapid development of Chinese exhibition economy has made a positive contribution
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