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149results about How to "Damage control" patented technology

Phase perturbation based island detection system for distributed gird-connected inverter

InactiveCN105162162AEliminate Phase Lock Accuracy IssuesStrong Robustness and Frequency AdjustmentElectrical testingSingle network parallel feeding arrangementsPhase lockingSingle phase
A phase perturbation based island detection system for a distributed gird-connected inverter is disclosed. The island detection system comprises a voltage controller, a multiplying unit, a summing unit, a current controller and a pulse width modulation generator which are serially connected in sequence, wherein the input ends of the voltage controller, the multiplying unit, the summing unit and the current controller are connected with direct current bus voltage and set direct current bus standard voltage respectively; the pulse width modulation generator is for outputting four paths of triggering pulse signals used for driving a single-phase H bridge inverter of a single-phase distributed gird-connected power generation system; the island detection system also comprises an orthogonal signal generator, a synchronous phase-locking device, a phase perturbation unit and a threshold value judging unit which are serially connected in sequence, wherein the input end of the orthogonal signal generator is connected with the voltage end of a point of common coupling of the single-phase distributed gird-connected power generation system; and the output end of the phase perturbation unit is connected with the input end of the multiplying unit. The phase perturbation based island detection system for the distributed gird-connected inverter has rapidness in island detection, stability of the detection system, and possibility of being used as island detection standard, can satisfy demand on percent of pass of the power quality, and has the important and actual application value in safe operation of the distributed new energy gird-connected power generation system.
Owner:TIANJIN UNIV

High-temperature molten salt electriochemistry testing system

The invention discloses a high-temperature molten salt electriochemistry testing system applicable to a temperature range of 750 DEG C - 900 DEG C; the high-temperature molten salt electriochemistry testing system comprises a high-temperature electric resistance furnace, high-temperature electriochemistry electrodes and a high-temperature molten salt crucible. A high-temperature molten salt reference electrode (2) is mainly composed of a first electrode stem (24) and a sleeve; the first electrode stem (24) is packaged in a first aluminum oxide sleeve (25) sealed by cement (27); a high-temperature molten salt working electrode (3) is mainly composed of a second electrode stem and a sleeve; the main body of the second electrode stem is packaged in a second aluminum oxide sleeve (32) including sealing cement, thus ensuring heat insulation and uniform distribution of heat under the condition of high temperature; a crucible cover (64) which is provided with a central hole (65) and made of ceramic is placed at the top of the crucible (6); the crucible cover (64) can effectively prevent electrolyte from volatilizing due to melting in high temperature, and thereby the furnace body of the electric resistance furnace is prevented from being eroded by volatilization of the molten electrolyte.
Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY

Nuclear power plant structure system capable of achieving space shock absorption

The invention provides a nuclear power plant structure system capable of achieving space shock absorption. The system comprises a nuclear island structure and is characterized in that the nuclear island structure is arranged in a safe case; the safe case is arranged in a protection case; multiple shock absorption devices are installed between the safe case and the protection case; the lower part of the safe case in which the nuclear island is arranged is fixed on the base face of the protection case through the shock absorption devices; and shock absorption devices are distributed and supported between the outer side face and the top of the safe case and the inner side face and the top of the protection case. According to the invention, the vertical stiffness of the shock absorption devices is proper; the stiffness of the whole structure is symmetrical; the swinging responses are small; a support seat is effectively protected; inclining of the structure is effectively avoided; the vertical and the horizontal accelerated speed responses of the structure are proper; the shock absorption of the three-dimensional space of the nuclear island structure is achieved; and safety of a nuclear power plant structure is improved.
Owner:SHANGHAI UNIV

Construction method for rock anchorage beam of underground workshop

The invention provides a construction method for a rock anchorage beam of an underground workshop. The method at least comprises the following steps: firstly, finishing the construction of an I layer of the underground workshop, namely an arch part; finishing the construction of a II layer; then the construction of a III layer; performing pre-splitting construction on two side walls of a IV layer; after the pre-splitting construction is finished, finishing the construction of a permanent support anchor rod; after a pre-splitting hole is excavated at the side wall of the IV layer, performing the construction of a rock anchorage beam bearing anchor rod, then casting a concrete beam body in the bearing anchor rod, and curing the concrete surface; and after protecting the concrete surface of the rock anchorage beam, performing the construction of the IV layer, wherein the IV layer construction is finished by means of forming a water groove in the middle, reserving protective layers at two sides, bench-blasting the middle part and smooth-blasting the two sides. Moreover, the used concrete is the concrete containing polypropylene fiber. The method is optimized based on the existing construction method for the rock anchorage beam, and can fully prevent the rock anchorage beam from cracking.
Owner:湖北白莲河抽水蓄能有限公司

Rear stress-type glaucoma diversion valve

ActiveCN104042401ADamage controlControl intraocular pressureEye surgeryGlaucomaIntraocular pressure
The invention provides a rear stress-type glaucoma diversion valve, relates to a method and a device for ophthalmosurgery and particularly relates to a rear glaucoma diversion embedding device for controlling intraocular pressure. The rear stress-type glaucoma diversion valve comprises a hollow diversion pipeline and a valve cover used for controlling the opening and closing of the diversion pipeline, wherein the outlet end of the diversion pipeline is provided with an openable and closable housing which consists of a diversion plate and a housing cover; the outlet end of the diversion pipeline is embedded in the diversion plate; the inlet end of the diversion pipeline is vertical to the lower surface of the diversion plate and downwards stretches out from the lower surface of the diversion plate; the diversion pipeline can enter from a pars plana corporis ciliaris by virtue of a 23G or 25G stab knife; the part, corresponding to the valve cover, of the inner side of the housing cover is provided with a spring pressurizing device; when the housing cover is closed, the spring pressurizing device applies a pressure to the valve cover. The spring pressurizing device is used for controlling the intraocular pressure within a normal and safe target intraocular pressure range; the inner cavity of the diversion pipeline is large in diameter, short in length and low in blockage possibility, thereby being conductive to ensuring the safety and effectiveness of the diversion valve and realizing long-acting control over the intraocular pressure.
Owner:SHANGHAI TONGJI HOSPITAL

Tunnel support structure suitable for large deformation of soft rock and construction method thereof

InactiveCN111140266AMobilize self-carrying capacityAbility to ensure long-term stabilityUnderground chambersTunnel liningShotcreteSteel frame
The invention discloses a tunnel support structure suitable for large deformation of soft rock. The tunnel support structure includes a steel frame support structure and an initial shotcrete and rockbolt support laid on the inner wall of a soft-rock large deformation tunnel inner wall, and several feet-lock bolts are arranged on the initial shotcrete and rock bolt support, the steel frame supportstructure includes a steel corrugated plate, a high strength spring and a ring support, the steel corrugated plate is connected to the feet-lock bolts, one end of the high strength spring is connected to the steel corrugated plate, the other end of the high strength spring is connected to the ring support, and the axial direction of the high strength spring is the same as the radial direction ofthe ring support. On the one hand, the tunnel support structure can reduce damage to the structure by the large deformation of surrounding rock of the tunnel by releasing a certain amount of deformation of the surrounding rock, and the deformation resistance and structural stability of the tunnel structure are effectively improved; and on the other hand, the structure with greater rigidity can resist the deformation of the surrounding rock after the deformation of the surrounding rock is released to a certain degree, so that the purpose of rigid and flexible supporting is achieved.
Owner:SOUTHWEST JIAOTONG UNIV

Method for operating and monitoring a control device, corresponding operating/monitoring device, control device and machine with such a control device, and uses of the method together with data storage media

There is described a method, wherein an interpreter program is executed on a control device and is adapted to access scripts having display components and program architectures. Said program architectures are enabled to access operating data of the firmware of the control device, said operational data being convertible to display data of a defined display format and vice versa. The scripts are run, the program architectures compiling the corresponding result in the form of display components with optionally the display data in the defined display format and making the result available to the operating / monitoring device. A display program is executed on the reporting / monitoring device in order to display at least the display components in the defined display format. References to at least one script on the control device are deposited in the display components. These references are connected to an event, and the interpreter program initiates and runs the corresponding script when this event occurs. The operating / monitoring device can no longer directly access the sensitive firmware of the control device. Communication is carried out via an interpreter program. Access to the actual control application is no longer possible.
Owner:SIEMENS AG

Swing column-hybrid limb-connected wall structure capable of restoring after being damaged in earthquake and assembly method

The invention discloses a swing column-hybrid limb-connected wall structure capable of restoring after being damaged in an earthquake and an assembly method. According to the swing column-hybrid limb-connected wall structure capable of restoring after being damaged in the earthquake and the assembly method, a reinforced concrete wall only generates a bending moment and shear force, axial force generated at the bottoms of wall limbs under the coupling effect is avoided, the energy dissipation requirement for a reinforcing region at the bottom of a shear wall is effectively lowered, damage to the wall limbs can be controlled more easily, the original axial force of the wall limbs is transferred to swing columns on the two sides, brittle shear damage to the wall limbs of the reinforced concrete wall under tension can be effectively avoided as long as the stability of the swing columns can be guaranteed under stress, and force transmission is simple and reliable. According to the swing column-hybrid limb-connected wall structure used as a first defense line for earthquake fortification, a steel coupling beam is good in ductility and high in energy dissipation capacity; a joint connection manner beneficial to replacement is adopted, so that disassembly is easy, and operation is simple; all fixing parts are of a detachable structure and can be re-spliced and re-connected after the energy-dissipation coupling beam is replaced, so that construction and post-earthquake consolidation are made very convenient.
Owner:XI'AN PETROLEUM UNIVERSITY

Method for operating and monitoring a control device, corresponding operating/monitoring device, control device and machine with such a control device, and uses of the method together with data storage media

There is described a method, wherein an interpreter program is executed on a control device and is adapted to access scripts having display components and program architectures. Said program architectures are enabled to access operating data of the firmware of the control device, said operational data being convertible to display data of a defined display format and vice versa. The scripts are run, the program architectures compiling the corresponding result in the form of display components with optionally the display data in the defined display format and making the result available to the operating/monitoring device. A display program is executed on the reporting/monitoring device in order to display at least the display components in the defined display format. References to at least one script on the control device are deposited in the display components. These references are connected to an event, and the interpreter program initiates and runs the corresponding script when this event occurs. The operating/monitoring device can no longer directly access the sensitive firmware of the control device. Communication is carried out via an interpreter program. Access to the actual control application is no longer possible.
Owner:SIEMENS AG

Method for realizing enhanced HEMT (high-electron mobility transistor) by using P-type nitride electrochemical etching

The present invention discloses a method for realizing an enhanced HEMT (high-electron mobility transistor) by using P-type nitride electrochemical etching. The method includes the following steps that: an etching sample is provided, the epitaxial structure of the etching sample comprises a heterostructure and a third semiconductor layer, wherein the heterostructure is composed of a first semiconductor layer and a second semiconductor layer, the third semiconductor layer is arranged on the second semiconductor layer and can deplete a two-dimensional electron gas in the conductive channel of the heterostructure, and the conductivity of the third semiconductor layer is higher than the conductivity of the second semiconductor layer; and a patterned etching mask is arranged on the third semiconductor layer, regions of the third semiconductor layer, which protrude out from the etching mask, are directly exposed in an etching solution, and etching current of a set strength is provided for the third semiconductor layer, and therefore, electrochemical etching on the third semiconductor layer can be realized, and an electrochemical etching process can stop automatically when all regions of the third semiconductor layer except a region covered by the etching mask are completely etched. With the method of the invention adopted, the enhanced HEMT can be effectively realized. The method has the advantages of simple process, etching automatic stop, high repeatability, low cost, small etching loss, easiness in realizing large-scale production and the like.
Owner:SUZHOU NENGWU ELECTRONICS TECH
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