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Kempers' study , the more layers the mesh screen type had, its resistance against gravity was higher, but its heat resistance and flow resistance were comparatively augmented. As mentioned in the preceding paragraph, it is extremely difficult for a single micro structure based on any of the three types to possess both low flow resistance and strong capillary force. Faced with this fact, the researchers have tried to mix the three micro structures in Table 2 into as many combinations as possible so that a composite micro structure with low flow resistance and great capillary force may be fabricated. After a thorough analysis, the groove combined with sintered metal or mesh screen has been found to be a better alternative. However, the groove combined with sintered metal will raise the flow resistance of the channel, and the aluminum substrate employed in this research cannot be sintered into a micro structure. As a result, the groove combined with mesh screen is finally chosen as the composite structure to enhance its capillary force and at the same time maintain its high permeability. In this way, the heat pipe will not fail due to the working angles.

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This article introduced application of digital laser vision technology in several key links during welded pipe manufacturing,including realizing weld tracking,adaptive adjusting welding parameters or angle of driving the strip, measuring coil plate width and edge contour,measuring steel pipe diameter,and automatic inspecting weld profile and defects,etc..

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Our company was established in 1982,with a registered capital of RMB 5 million yuan,a factouy area of 18,000㎡,and construction atrea of over 7,000 ㎡,soecializing in police weapon production.it can annually produce 300,000 pairs of tubular-type handcuffs,500,000 pairs of plate-type handcuffs,100,000 pairs of fetters,and 300,000 shrinking police truncheons,etc.,the police weapon producet has passed ISO9001:2000 quality system certification;FBSK160 anti-moving handcuff and SK 160B plate-type handcuff researched and developed by our company has obrained two state patents ; the products has met the standards and requirements of the US NIJ0307-01, successively exported to Greece,America,Korea,and other countries,deeply trusted and valude by customers at home and abroad.

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