65results about How to "Reduce surface concentration" patented technology

The invention is concerned with the manufacture method of the ditch groove power semiconductor device. It is: provides the materials of the basal; forms the first electric transmit epitaxy layer on the basal; forms the second electric transmit zone and the ditch groove inside the epitaxy layer; forms the ebb first electric transmit area and the medium layer with the ditch groove; and then, forms the electric transmit area within the medium layer; forms the first electric transmit source area on the surface of the second electric transmit area; forms the second electric transmit contact area with higher doping PH indicator on the second electric transmit zone surface; forms the passivation layer cap on the top of the ditch groove which must with the medium layer and the electric transmit area; forms the diffusion protecting layer on the surface of the source area and the contact area; finally, forms the structure surface with good electric connection. The invention can control the threshold voltage of the device and improves the breakdown strength of the oxide layer of the device bottom area, and improves its electric connection reliability with no extra cover film printing plate and complex method request.

The invention discloses a carburizing method of low-carbon alloy steel. According to the method, through high-temperature deep seepage, the diffused carbon potential can be properly lowered, and the diffusion time can be prolonged, the time can be effectively shortened, the energy consumption can be reduced, and the carburized low-carbon alloy steel can meet the technical requirements.

The present invention relates to a system for transporting and / or washing and / or pasteurization thermal treatment of foodstuffs, particularly leaf products comprising at least a treatment section. The treatment section can be comprised of one or more sections of rectilinear tubes and one or more corresponding curved tube sections, wherein products within the treatment section being conveyed by a fluid, such as water, flowing along the tubes.

The invention discloses a static mixed flow separating screen for a spiral-wound membrane. The screen is composed of a plurality of separating screen strips which are fixed through a separating screen strip frame and uniformly distributed in the feeding direction at equal intervals. Each separating screen strip is composed of a plurality of separating screen units. Each separating screen unit is provided with three fluid channels perpendicular to the fluid inlet direction. Fluid carries out static flow mixing in the separating screen units and does not generate vortexes or turbulence, and fluid dead space does not exist when the fluid flows through the separating screen. According to the static mixed flow separating screen for the spiral-wound membrane, the fluid close to the surface of the membrane and the fluid in the centers of the fluid channels can be transferred mutually, the mechanical condition of the fluid on the surface of the membrane is changed, the vortexes and the turbulence are avoided, the separating screen is different from various existing schemes, the surface concentration of materials held back by the membrane is reduced, the mass transfer rate is increased, and fluid mixing is strengthened; moreover, pressure drop and pump consumption increased in the operating process of the membrane due to adding of the separating screen are reduced while concentration polarization and membrane pollution are effectively reduced, and the energy utilization ratio is increased.