The passive infrared detector optical system includes three types: Fresnel lens, parabolic mirror, and blocking sheet.
There are two effects of Fresnel lens: one is the focusing effect, which refracts (reflects) the infrared signal released by the pyrolysis on…
As the EU reached an agreement on the rescue of Greece, market sentiment was greatly boosted, international oil prices rose sharply on the 21st, and New York and London both hit a nine-month high.
On the same day, after several twists and turns, the E…
On the same day, after several twists and turns, the E…
With the continuous development of the society, the security of locks has received more and more attention. According to Maslow's hierarchy of needs, security demand is a low-level demand that is only higher than physiological needs. However, in the histor…
>>>Related Links:Birds must read: buy cupboard trend hardware accessories
Handle type
1, drawer handle 2, door handle 3, glass door hand…
According to the forecast of CMAI of the American Chemical Market Association, China's strong demand for nylon 6 is driving the growth of this engineering polymer market. It is expected that by 2015, the annual average growth rate of nylon 6 demand will…
In order to promote the transformation of economic development mode, improve the overall quality of China's quality, and achieve sound and rapid economic and social development, the State Council issued the "Quality Development Outline (2011-2020)", the outline proposed, and ac…
The status of China’s hardware power has established that the hardware product industry is an important part of China’s light industry, and it is a sunrise industry that has ample market competition and is closely related to people’s lives…
Recently, the United States Certis Corporation and Japan Composite Chemicals announced that it will launch a new generation of biological antibacterial agents worldwide. The main component is variant Ba.
D747 of Bacillus amyloliquefaciens. The variant…
D747 of Bacillus amyloliquefaciens. The variant…
Abstract The Science and Technology Department of Heilongjiang Province held a special research meeting on the strategic planning of graphite new materials science and technology development at Heilongjiang Institute of Science and T…
Recently, Nanchang Jiate Science and Technology Co., Ltd. applied a solid-liquid extraction method to prepare a new 30,000-ton-ton industrial test plant built with the new technology of phosphoric acid, which has been continuously operated for more than 48 hou…
Usually rotary vane vacuum pump is driven by three-phase alternating current, should also pay attention to the power cord link, in order to ensure the correct direction of rotation, otherwise, the pump oil will be discharged to the vacuum chamber. Therefore, the pump should be set to reverse br…