229results about How to "Reduce sensitivity" patented technology

Mixed technology integrated device comprising complementary LDMOS power transistors, CMOS and vertical PNP integrated structures having an enhanced ability to withstand a relatively high supply voltage

Complementary LDMOS and MOS structures and vertical PNP transistors capable of withstanding a relatively high voltage may be realized in a mixed-technology integrated circuit of the so-called "smart power" type, by forming a phosphorus doped n-region of a similar diffusion profile, respectively in: The drain zone of the n-channel LDMOS transistors, in the body zone of the p-channel LDMOS transistors forming first CMOS structures; in the drain zone of n-channel MOS transistors belonging to second CMOS structures and in a base region near the emitter region of isolated collector, vertical PNP transistors, thus simultaneously achieving the result of increasing the voltage withstanding ability of all these monolithically integrated structures. The complementary LDMOS structures may be used either as power structures having a reduced conduction resistance or may be used for realizing CMOS stages capable of operating at a relatively high voltage (of about 20V) thus permitting a direct interfacing with VDMOS power devices without requiring any "level shifting" stages. The whole integrated circuit has less interfacing problems and improved electrical and reliability characteristics.

Magnesia cement slurry for water plugging, leak plugging, and temporary plugging of oil and gas well reservoirs and its preparation method

The invention relates to magnesium-oxygen cement slurry used for reservoir water plugging, leak plugging and temporary-closure plugging in an oil and gas well and a preparation method thereof. The cement slurry contains the following components in parts by weight: 100 parts of active magnesium oxide, 50-105 parts of water, 30-100 parts of water-soluble blending agent, 0.5-10 parts of water-soluble borate, 1-8 parts of carbohydrate retarding agent, 0-400 parts of acid-soluble hard filling material, 1-5 parts of fluid loss agent, 0-5 parts of foaming agent and 0-2.5 parts of foam stabilizing agent, wherein the active magnesium oxide is obtained through roasting magnesium carbonate or magnesium oxide at high temperature; the water-soluble blending agent is a mixture which is one or over two of sodium pentaborate, sodium tetraborate and disodium octaborate tetrahydrate; the carbohydrate retarding agent is a mixture which is one or over two of sucrose, lactose and glucose; and the acid-soluble hard filling material is calcium carbonate or magnesium carbonate. According to the invention, a magnesium-oxide cement stone is removed from a stratum layer by using an acidizing way; the damageto the stratum layer is low; and the wide practical value is achieved.

Semiconductor power device with high-K medium tank

The invention relates to a semiconductor power device with a high-K medium tank, belonging to the technical field of power semiconductor devices. The device comprises a semiconductor substrate, a semiconductor drift region on the semiconductor substrate, and an active area and a trench gate structure on the semiconductor drift region, wherein the semiconductor drift region comprises a first semiconductor area and a second semiconductor area having the same conduction type; the dosage concentration of the second semiconductor area is higher than that of the first semiconductor area, and the width of the second semiconductor area is smaller than that of the first semiconductor area; a high-K medium tank is arranged below the trench gate structure; two ends of the high-K medium tank are contacted with a conductive material of the trench gate structure and the semiconductor substrate respectively, and two sides of the high-K medium tank are contacted with the second semiconductor area; and the drift region consisting of the first semiconductor area and the second semiconductor area are symmetrically distributed at two sides of the high-K medium tank. The semiconductor power device has the advantages of being high in voltage resistance, small in on resistance, low in power consumption, large in process tolerance, simple in manufacturing process and low in cost and the like, and is suitable for being as the power semiconductor device with low power consumption.

Arc welding-brazing method for titanium-aluminum dissimilar alloy TIG (tungsten inert gas) arc preheating

InactiveCN102528243AImprove unevennessReduce sensitivityArc welding apparatusArc weldingBrazing
The invention provides an arc welding-brazing method for titanium-aluminum dissimilar alloy TIG (tungsten inert gas) arc preheating. A TIG preheating welding gun is introduced to common arc welding, a titanium-aluminum connector is locally preheated by heating a copper backing plate with a TIG preheating arc, V-shaped grooves with truncated edges are processed on two sides of each of a titanium alloy plate and an aluminum alloy plate, the copper backing plate is additionally padded at the butt joint of the connector, the TIG arc is used for heating the back of the copper backing plate, areas close to the titanium-aluminum connector are preheated by means of heat conduction of the copper backing plate, and uniform movement of the TIG preheating arc and a main arc is ensured during welding. The arc is used as a heating source, the requirement on cleaning the surface of a workpiece can be lowered by the aid of a cathode atomizing function of the arc, growth of intermetallic compounds of titanium-aluminum brazing interfaces can be hindered by the aid of an electromagnetic stirring function of the arc, appearance and distribution of the intermetallic compounds are improved, a high-strength titanium-aluminum welding connector can be formed, the equipment cost is low, practicability is high, and the arc welding-brazing method is convenient in popularization and application.

Intermediate-pressure control two-position variable axial plunger hydraulic motor

The invention discloses an intermediate-pressure control two-position variable axial plunger hydraulic motor, which belongs to the technical field of hydraulics. The hydraulic motor comprises a shuttle valve, a reducing valve, a two-position four-way valve, a variable hydraulic cylinder, a damper, a variable axial plunger hydraulic motor, a washing shuttle valve and a washing overflow valve. The pressure of system high-pressure oil is reduced into an intermediate pressure by the shuttle valve and the reducing valve so as to drive a servo piston of the variable hydraulic cylinder to move. Due to the adoption of intermediate-pressure control, the hydraulic motor can simultaneously integrates the advantages of controlling the variable hydraulic cylinder by a system high pressure and a system low pressure so as to easily realize high-speed and low-speed adjustment in the conceptual design of the same variable motor, select relatively greater damper bore diameters, realize proper variable speeds, achieve a wider speed adjustment range and high control performance, and reduce the sensitivity of the variable hydraulic cylinder to pollution. An initial position of motor displacement can be randomly set to be a maximum or minimum displacement position according to the needs of clients. Due to the adoption of the hydraulic cylinder with a medium piston size, the overall dimension of the whole variable motor can be optimally designed.

Robust beamforming method with resistance to array system errors

The invention discloses a robust beamforming method with resistance to array system errors. The method comprises the following steps: first, carrying out eigen-decomposition of a sampled data covariance matrix received by an array antenna; estimating an eigenvector corresponding to a desired signal according to the correlation between the steering vector of the desired signal and the eigenvector corresponding to the desired signal, so as to further remove the eigenvector corresponding to the desired signal out of the covariance matrix; performing weighted combination to a subspace (formed by the rest of eigenvectors) and an interference plus noise covariance matrix estimated by Capon spectrum to obtain an interference plus noise covariance matrix used in the beamforming method disclosed by the invention; and carrying out a quadratically constrained quadratic optimization algorithm to obtain the corrected steering vector of the desired signal. The robust beamforming method provided by the invention has the advantages of effectively avoiding performance reduction caused by array system errors and greatly improving the robustness of a beamformer; compared with the most of current robust beamforming methods, the robust beamforming method provided by the invention is capable of getting closer to a theoretical output SINR (signal to interference plus noise ratio) and has better output performance.
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