181results about How to "Prevent flow through" patented technology

The invetion relates to a prosthetic heart valve system(10;200;300) and a delivery system(400) therefor, wherein the prosthetic heart valve system(10;200;300) comprises a heart valve element(20) with expandable generally tubular stent support (102)forming a wire frame, wherein the tubular stent support(102) comprises a plurality of adjacent rows of interconnected, substantially diamond-shaped cell structures(171) extending, along and in parallel to the longitudinal direction, between the proximal end and distal end, and wherein the stent support(102), in a medial portion(105), comprises a circumferential row of a plurality of wire anchor structures(171) which wire anchor structures are spaced from one another and attached to the wire frame and which, in respect to the longitudinal axis of the stent support(102), at least partially protrude outward at an angle [alpha]. The prosthetic heart valve system may also comprise a stent(graft)-element(310).

Brake mode switching signal production means detects the number of revolutions per unit time of a rotor according to a change in a positional relationship between motor windings of a plurality of phases and the rotor so as to output first and second brake mode switching signals for selecting either a short brake mode or a reverse brake mode for braking the rotation of the rotor based on the number of revolutions. Control means outputs an energization control signal for controlling energization of the motor windings of a plurality of phases in response to the first and second brake mode switching signals. Thus, it is possible to reduce the braking noise and the stopping time.

Provided is a tape base material for assembling a display device, which has a superior light blocking effect and light reflectivity. In the tape base material (A) for assembling display device, a base material film (1) is provided, light blocking layers (2, 2) are integrally laminated on both sides of the film, and a light reflection layer (3) is integrally laminated on one of the light blocking layers (2). The light blocking layers (2, 2) are separately formed with the base material film (1) therebetween. Therefore, when pinholes are formed on each light blocking layer (2), since the pinholes have extremely small diameters, there is very little possibility that the pinholes formed on the respective light blocking layers (2) overlap each other, and thus, the light can be reliably blocked by the two light blocking layers (2, 2).

A breast warmer implements heat coupling to a heat radiation board (4) and a heater (3) which is electrified by inner battery (1) through an outer shell (2). The battery (1) is a rectangle charging battery (1A) composed of lithium ion charging battery or lithium polymer battery which constitute rectangle using two opposite surface as plane (1a). The heater (3) is a heating body and opposites to the plane (1a) of the battery (1). Setting a shield board (5) between the heater and the plane (1a) of the battery (1). Setting a heat radiation board (4) after coupling with the heater on the surface of the outer shell (2). The breast warmer is characterized in that the plane (1a) of the rectangle charging battery (1A), the shield board (5), the heater and the heat radiation board (4) form cascade structure, and heats the heat radiation board (4) using the heating body. The breast warmer improves the temperature circumstance of the battery and prolongs heating time, and is minitype as well as light so as to carry easily.

The invention relates to a method for forming a magnetic sensor. The method comprises the following steps of providing a substrate and forming a magnetic material layer on the substrate; forming a high resistance barrier layer on the magnetic material layer; forming a patterned magnetic material layer and a patterned high resistance barrier layer. The magnetic sensor formed by adopting the method disclosed by the invention is high in relative change rate of anisotropic magnetoresistance.

A resistance-change non-volatile memory device (100) is provided with memory cells (M11, M12,...), each comprising a resistance-change element (R11, R12,...) and a current control element (D11, D12,...) connected in series. The resistance-change elements constitute a resistance-change layer interposed between a first electrode and a second electrode and provided so as to contact both electrodes. The current control elements constitute a current control layer interposed between a third electrode and a fourth electrode and provided so as to contact both electrodes. To decrease the resistance of the resistance-change elements, said elements are driven by a first LR drive circuit (105a1), via a current control circuit (105b). To increase the resistance of the resistance-change elements, the elements are driven by a second HR drive circuit (105a2). The current control circuit (105b) makes the current lower when decreasing the resistance of the resistance-change elements than when increasing the resistance thereof.

The invention discloses a servomotor current control method and servomotor. Since, during a light load operation, the produced torque is small and the overall current command I* given to the armature of a servomotor is small, the magnitude in the negative direction of a reactive current command Id* determined by Id*=-|I*|sin theta is small. Therefore, during a light load operation, the overall current flowing through the armature can be small, and production of wasteful heat can be suppressed. During a heavy load operation, since the q-axis current Iq for producing the torque is large, voltage saturation is liable to occur. However, simultaneously with this, the overall current command I* is large during a heavy load operation, and Id* is large in the negative direction. Therefore, a large reactive current Id can be made to flow in the negative direction, and voltage saturation during a heavy load operation can be effectively prevented.

The invention discloses a box type water retaining dam for a coal mine underground reservoir. The box type water retaining dam is located between coal pillar dam bodies on the left side and the rightside of a roadway and used for isolating the underground reservoir and the roadway and blocking a water source in the underground reservoir. The box type water retaining dam comprises a main dam bodyand water retaining wings, wherein the main dam body is of a box type structure, the left side and the right side of the main dam body are embedded in the coal pillar dam bodies on the two sides, thetop of the main dam body is embedded in roadway roof surrounding rock, and the bottom of the main dam body is embedded in roadway bottom plate surrounding rock; and the water retaining wings compriseside wings, the side wings are connected with the left side and the right side of the main dam body and arranged along at least the whole height range of the main dam body, the side wings are embeddedinto the coal pillar dam bodies on the two sides to a certain depth, and thus side wing seepage prevention areas are formed. The box type water retaining dam can reduce crippling and water seepage caused by excessive local stress of the surrounding rock at the same time, adjusts differential settlement, prevents the surrounding rock from being softened due to water entering, and ensures the stability and safety of the dam bodies.

A self-expandable bracket flexible connecting ring press mechanism, includes an inner tube and a locking wire for constituting the transporting and discharging system, and a plurality of flexible connecting rings for pressing the bracket, wherein the plurality of flexible connecting rings are respectively connected on the bracket, wherein at least one flexible connecting ring passes through the bracket and the side opening of the inner tube and are provisionally passed through by the locking wire to block. The self-expandable bracket flexible connecting ring press mechanism of the invention can expediently make the radial compression on the self-expandable bracket at the process of transporting and discharging the self-expandable bracket, and expediently releases the compression after transporting and discharging to the proper position, and the self-expandable bracket fast releases the expand. The invention has simple structure, thin thickness, small radial expanding friction on the self-expandable bracket, easy operation.

The present invention relates to a cooling system which is used for an internal combustion engine and consists of a first cooling circulation comprising a component cooler, an environment heat exchanger and a pump (18) and a second cooling circulation comprising a component cooler and a pump (24), wherein the cooling circulations are integratedly configured in at least one section and coolant configured to be conveyed by the pumps (18, 24) is arranged in the cooling circulations, and the cooling system is characterized in that the pumps are adjustably configured and adjustment of volume flow of the coolant flowing through the component coolers can be realized through cooperated operation of the pumps (18, 24).

The invention discloses a device for testing insulation characteristics of a low temperature insulation material based on conductive cooling, which comprises a vacuum low temperature test box, a highvoltage generator and a refrigerator, wherein an insulation cold conductive piece, a high voltage electrode, a grounding electrode and a test sample are arranged in the vacuum low temperature test box; the test sample is located between the high voltage electrode and the grounding electrode and is subjected to conductive cooling by the grounding electrode; the insulation cold conductive piece is connected with the refrigerator for preventing discharge current from flowing through the refrigerator and performing conductive cooling; the high-voltage generator is used for generating high voltageto be introduced to the high voltage electrode; and the refrigerator is connected with the grounding electrode through the insulation cold conductive piece for refrigeration and uses the grounding electrode for conductive cooling. The device of the invention can effectively solve the testing problems of electrical characteristics, breakdown voltage resistance characteristics and surface flashovercharacteristics of sheet or thin film low temperature insulation materials under conductive cooling conditions, and key technology supports are provided for the design of the low temperature insulation structure of a conductive cooling energy pipeline with a conductive cooling superconducting energy storage magnet, power transmission and low temperature fuel conveying integrated.

The invention relates to a method for operation of a photovoltaic installation for feeding electrical power into a medium-voltage power supply grid (41), with the photovoltaic installation having a multiplicity of photovoltaic modules (11), at least one inverter (21) and at least one medium-voltage transformer (31), and with the primary side of the medium-voltage transformer (31) being connected directly to an alternating-current (AC) low-voltage output (24) of the inverter (21), and at least one direct-current (DC) switching member (12) being arranged between the photovoltaic modules (11) and a DC input (22) of the inverter (21). The method is distinguished in that when the electrical power produced by the photovoltaic modules (11) in the photovoltaic installation is not sufficient for feeding electrical power into the supply grid (41), the photovoltaic modules (11) are disconnected from an inverter (21) on the DC voltage side while, in contrast, the inverter (21) remains connected to the medium-voltage power supply grid (41) on the AC voltage side by the medium-voltage transformer (31). The invention also relates to a photovoltaic installation which is designed to carry out the method.

An output interface circuit comprises a terminal connected with an external equipment, a source level converting circuit connected with the terminal, a drain level converting circuit connected with the terminal, a dip switch and a control device; when the operator operates the dip switch to select the source output corresponding mode, the source level converting circuit converts the level of an output signal of the control device to a high level and outputs to the external equipment; when the operator operates the dip switch to select the drain output corresponding mode, the drain level converting circuit converts the level of the output signal of the control device to a high level and outputs to the external equipment; an input interface circuit comprises a terminal connected with the external equipment, the dip switch, the drain level converting circuit connected with the terminal, the source level converting circuit connected with the terminal, and the control device; when the operator operates the dip switch to select the drain input corresponding mode, the drain level converting circuit converts the level of an input signal of the terminal to a low level and inputs to the control device; when the operator operates the dip switch to select the source input corresponding mode, the source level converting circuit converts the level of the input signal of the terminal to a low level and inputs to the control device.