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152 results about "Multiple stress" patented technology
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Stress and multiple sclerosis seem at times to go hand in hand. Studies have shown that stressful life events can trigger exacerbations in relapsing-remitting multiple sclerosis (rrms). Some additional studies appear to indicate a high correlation between stress and the development of multiple sclerosis.
Clamp, device with clamp for testing mechanical property of hyper-elastic material and method
InactiveCN102768149AUniform deformationQuick disassemblyMaterial strength using tensile/compressive forcesData acquisitionHyper elastic
The invention relates to a device and a method for testing mechanical property of a hyper-elastic material. The device mainly comprises a reinforcing piece (4) at the end of a test piece and a test piece clamp, wherein the reinforcing piece (4) has a trapezoidal cross section; a clamping port of the clamp is an inclined surface; the reinforcing piece (4) is adhered to the end of the test piece and is arranged in the clamp, the inclined surface of the clamp tightly clamps the inclined surface of the reinforcing piece (4), and the clamp is self-locked in the tensioning process and is prevented from locally deforming. The device is applied to multiple stress-strain tests of the hyper-elastic material such as uniaxial tension, equally biaxial tension and planar tension (pure shear). Stress data is acquired by a data acquisition system of an electronic universal testing machine, and the strain data is acquired by a charge coupled device (CCD) image acquisition device. Due to the technical scheme, the clamping force is high when the tension is high in the process of tensioning the test piece, so that the test piece is uniformly stressed, more accurate testing data can be obtained, and the mechanical property parameters of the hyper-elastic material obtained accordingly are more reliable.
Owner:TSINGHUA UNIV
Technique for providing multiple stress sources in nmos and pmos transistors
ActiveUS20070096195A1Increased processing flexibilityEfficient transferTransistorSemiconductor/solid-state device detailsStress inducedEngineering
By combining a plurality of stress inducing mechanisms in each of different types of transistors, a significant performance gain may be obtained, thereby providing enhanced flexibility in adjusting product specific characteristics. For this purpose, sidewall spacers with high tensile stress may be commonly formed on PMOS and NMOS transistors, wherein a deleterious effect on the PMOS transistor may be compensated for by a corresponding compressively stressed contact etch stop layer, while the NMOS transistor comprises a contact etch stop layer with tensile stress. Furthermore, the PMOS transistor comprises an embedded strained semiconductor layer for efficiently creating compressive strain in the channel region.
Owner:ADVANCED MICRO DEVICES INC
Drop weight type dynamic and static combined load impact experimental device
InactiveCN104142278AAvoid hurtingSimple structureMaterial strength using tensile/compressive forcesDrop weightElectric machinery
The invention discloses a drop weight type dynamic and static combined load impact experimental device which is characterized by comprising a body (1) and a sample bearing table (2), wherein the sample bearing table (2) is positioned on the body (1); a sample is arranged on the sample bearing table (2) and is connected with a hydraulic static load pressure mechanism which applies static pressure; an impact mechanism which can move up and down along a guide post (7) is arranged on the upper part of the body (1) and is connected with a lifting mechanism arranged on the lower part of the body. According to the experimental device disclosed by the invention, the coal and rock sample can be dynamically and controllably loaded in different dynamic and static combined forms, and multiple stress wave loading modes of coal and rock materials are simulated, so that the experimental result has the high practical engineering significance. The drop weight type dynamic and static combined load impact experimental device is simple in structure, convenient to operate and good in controllability. According to power failure tightening states of a brake driving motor and an electric hook, the impact mechanism is prevented from falling to injure people during unexpected power failures, so that the effective safety protection is realized.
Owner:CHINA UNIV OF MINING & TECH
Method for measuring residual stress of thin plating layer based on surface ultrasonic waves
InactiveCN102636303AImprove accuracyAvoid quality and safety hazardsForce measurementMultiple stressTime difference
The invention discloses a method for measuring the residual stress of a thin plating layer based on surface ultrasonic waves. The method comprises the following steps of: setting the working distance between a transmitting probe and a receiving probe; preparing a thin plating layer sample to be measured into a standard stretching member, and performing stress relief annealing; fixing the display time of an initial wave signal; under multiple stress conditions, testing the thin plating layer sample to be measured, and recording the surface ultrasonic wave signal under each stress condition until a macrocrack appears on the thin plating layer to be measured; defining a reference signal, and respectively calculating the time difference between the surface ultrasonic wave signal of the thin plating layer to be measured and the reference signal under multiple stress conditions; fitting an acoustic elasticity formula for describing the relationship between the stress and the time difference according to the corresponding relationship between multiple stresses and the time difference; and calculating the time difference between the surface ultrasonic wave detection signal and the reference signal for the sample to be measured of the thin plating layer with the same thickness and same type as the thin plating layer sample to be measured, and calculating the residual stress value of the sample to be measured by use of the acoustic elasticity formula.
Owner:ACADEMY OF ARMORED FORCES ENG PLA
Shield segment joint anti-penetrability performance test device
ActiveCN104075854ASimple and fast operationPracticalDetection of fluid at leakage pointLiquid stateEngineering
The invention provides a shield segment joint anti-penetrability performance test device which comprises a high-pressure water supply system, a test bed and a measurement system. The high-pressure water supply system is used for supplying pressure water or liquid. The test bed is used for mounting a test piece, supplying the action space of the pressure water (liquid) and simulating the contact state of a segment joint. The measurement system is used for setting test work station parameters and measuring test process data. The high-pressure water supply system is connected with the test bed through a high pressure resisting hose. The measurement system is executed in the mode of connecting all sensors mounted on the test bed, a recorder and a computer for reading through cables. A shield segment joint anti-penetrability performance test under the aging state of multiple rubber water stopping strips, the contact state of multiple joints and multiple stress states can be achieved, the operation is easy and convenient, and high practicality is achieved. The device can be widely used for the test detection or study for the short-term performance and long-term performance of the rubber water stopping strips under the water environment or the liquid environment.
Owner:CENT SOUTH UNIV
Method and apparatus for measuring acute stress
A method and apparatus are provided to quantify psychological and physiological components to measure acute stress in humans, in which a stimulus can be applied to the test subject's environment during the test. The method involves multiple stress / relaxation intervals while physiological measurements are taken and “measured,” and involves questionnaires that are answered after each of the intervals to “measure” the test subject's psychological state. A computerized testing apparatus acquires the physiological measurements, and also is used by the test subject in answering the questionnaires. The “stimulus” can be a fragrance, flavor, product, or task, and a “blank stimulus” is normally used during one of the stress intervals.
Owner:THE PROCTER & GAMBLE COMPANY
Method for calculating vehicle induced vibration response of railway bridge structure
InactiveCN103853896AImprove securityGuaranteed accuracySpecial data processing applicationsTime domainEngineering
The invention discloses a method for calculating the vehicle induced vibration response of a railway bridge structure, and belongs to the technical field of engineering design calculation. According to the method, a stochastic problem in a field domain is converted into a definite solving mode on the time domain on the basis of a pseudo excitation method; the time-varying characteristics of a vehicle-bridge coupling system and the irregularity of a track as the self-excitation indeterminacy of a system are considered, and the obtained vehicle induced vibration response of the railway bridge structure is within a range interval; the range interval can compromise multiple stress states of the railway bridge structure, so that the accuracy of a calculating result is ensured, and the structural safety is enhanced.
Owner:李小珍 +2
Technique for providing multiple stress sources in NMOS and PMOS transistors
ActiveUS7329571B2Efficient transferIncreased processing flexibilityTransistorSemiconductor/solid-state device detailsStress inducedEngineering
By combining a plurality of stress inducing mechanisms in each of different types of transistors, a significant performance gain may be obtained, thereby providing enhanced flexibility in adjusting product specific characteristics. For this purpose, sidewall spacers with high tensile stress may be commonly formed on PMOS and NMOS transistors, wherein a deleterious effect on the PMOS transistor may be compensated for by a corresponding compressively stressed contact etch stop layer, while the NMOS transistor comprises a contact etch stop layer with tensile stress. Furthermore, the PMOS transistor comprises an embedded strained semiconductor layer for efficiently creating compressive strain in the channel region.
Owner:ADVANCED MICRO DEVICES INC
Method of conferring multiple stress tolerance and early flowering in plants
InactiveUS20080005810A1Improve germination rateImprove toleranceOther foreign material introduction processesFermentationAbscisic acidNannochloropsis
Transgenic plants are more tolerant to environmental stresses than untransformed plants. The pea ABR17 (Abscisic acid responsive 17) is used to enhance germination of plants such as Arabidopsis sp. and Brassica sp. while under multiple abiotic stresses, and to enhance the tolerance of these plants to these stresses. Three independently derived Arabidopsis transgenic lines, containing ABR17, germinated better in the presence of salt, cold temperature or both. The transgenic plants also exhibited enhanced tolerance to freezing temperature or extreme heat. Furthermore, the transgenic plants demonstrated early flowering even under normal, non-stressed conditions.
Owner:THE GOVERNORS OF THE UNIV OF ALBERTA
Polymer-modified asphalt with a crosslinking agent and methods of preparing
Methods of preparing a cross-linked, polymer-modified asphalt is provided. The method involves adding a crosslinking agent to asphalt prior to the addition of a crosslinkable polymer and an acid. Asphalt prepared by the disclosed methods exhibit improved properties such as properties measured by the Multiple Stress Creep Recovery (MSCR) test.
Owner:ICL PERFORMANCE PROD
Rock core gripper for simulating formation multiple stress field coupling action
This invention discloses a rock core clamper, which can distinguish the horizontal stress and vertical stress in the stratum rock and mock the stratum stress status in reality and can be used to measure the porosity and penetration degree of the rock and their varying rule with the stress. The rock core clamper mocks couple functions with multiple stress fields, which comprises flow penetrate board, pressure guiding block, upper cover, base socket and hollow rubber ring. And it has two set pressure systems and the pressure exerted on the rock core through the pressure-guiding block makes the rock core generate vertical stress and the hollow rubber ring is filled with flow to press the rock core and makes the rock core generate horizontal stress.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Analysis of stress impact on transistor performance
ActiveUS20090288048A1Reduce the amount requiredRelieve pressureDetecting faulty computer hardwareCAD circuit designStress inducedEngineering
Roughly described, a method for approximating stress-induced mobility enhancement in a channel region in an integrated circuit layout, including approximating the stress at each of a plurality of sample points in the channel, converting the stress approximation at each of the sample points to a respective mobility enhancement value, and averaging the mobility enhancement values at all the sample points. The method enables integrated circuit stress analysis that takes into account stresses contributed by multiple stress generation mechanisms, stresses having vector components other than along the length of the channel, and stress contributions (including mitigations) due to the presence of other structures in the neighborhood of the channel region under study, other than the nearest STI interfaces. The method also enables stress analysis of large layout regions and even full-chip layouts, without incurring the computation costs of a full TCAD simulation.
Owner:SYNOPSYS INC
Test device for realizing loading and unloading of different stress paths in rock holes
ActiveCN105865930ACompact structureMaterial strength using tensile/compressive forcesFuel tankHydraulic pump
The invention discloses a test device for realizing loading and unloading of different stress paths in rock holes. The test device comprises an electro-hydraulic servo loading / unloading system and an inner-hole loading / unloading executing mechanism, wherein the electro-hydraulic servo loading / unloading system comprises an oil tank, a hydraulic pump station, an electric control pressure adjusting system, a three-position four-way electro-hydraulic directional control valve, a pressurization system, a speed-adjusting unloading system, a high pressure pipeline and a control host machine; the inner-hole loading / unloading executing mechanism is formed by assembling a hydraulic pressure bag, an inner-outer lock, a pressing nut, an L-shaped elbow, a joint, a rigid pressing plate with a U-shaped slot and a supporting block. The test device has a compact structure, is suitable for rock true triaxial and conventional triaxial tester, can be used for loading / unloading central holes of the rock sample, wherein the hole depths are 1 to 1.5 times of the length of the hydraulic pressure bag and the cross sections are circular, oval, square and arc, can be used for realizing the quick uniform loading of multiple stress paths in rock holes and the quick synchronous reconstruction of the stress gradient at each point in the rock sample and also can be used for preventing the hydraulic oil from invading the rock sample and influencing the mechanical property.
Owner:CENT SOUTH UNIV
Saccharomyces cerevisiae strain with multiple-stress resistance, and application thereof in cellulose alcohol fermentation
InactiveCN102199554AImprove toleranceEfficient conversionFungiMicroorganism based processesHydrolysateAlcohol production
The invention discloses a saccharomyces cerevisiae strain with multiple-stress resistance, and the application of the saccharomyces cerevisiae strain in cellulose alcohol fermentation. The invention provides a saccharomyces cerevisiae T43 CGMCC No. 4642. The saccharomyces cerevisiae T43 has strong temperature adaptability (such that cooling and heating cost is reduced during fermentation processes) and good tolerance with inhibitors in cellulose hydrolysate (such that production processes can be simplified, and fermentation time can be shortened). Therefore, the saccharomyces cerevisiae has good prospect to be adopted in industrial application. According to the present invention, the efficient conversion of glucose in corn stalk hydrolysate to ethanol can be achieved, and the saccharomyces cerevisiae can be directly used in present fuel ethanol production technologies and new lignocellulose ethanol technologies. With the technical scheme of the present invention, ethanol production theorugh cerevisiae fermentation of cellulose hydrolysate can be started at a high temperature. According to the present invention, low energy consumption, low material consumption, low cost and high ethanol yield can be achieved in the cerevisiae fermentation process of cellulose alcohol production. With the present invention, huge economic benefits and good social benefits are brought in.
Owner:INST OF MICROBIOLOGY - CHINESE ACAD OF SCI
Implementation method for multiple stress systems of beam bridge in straddle type monorail transport line
InactiveCN103437294AImprove riding performanceImprove adaptabilityRailway tracksBridge structural detailsTerrainBridge engineering
The invention relates to an implementation method for multiple stress systems of a beam bridge in a straddle type monorail transport line, and belongs to the technical field of bridge engineering, wherein the implementation method is applied to all types of straddle type monorail transport including light-duty, medium-duty and heavy-duty straddle type monorail transport. According to the implementation method, an existing straddle type monorail transport line design is changed from a single simply supported system to the multiple stress systems including a simply supported variable continuous system, a simply supported variable continuous rigid frame system, a simply supported variable rigid frame system, a simply supported system and the like. Therefore, adaptability to the terrain, landforms, geological conditions, road conditions and the like on the line is enhanced, the smoothness of the line is enhanced, the number of expansion joints and supports on the monorail transport line is greatly reduced, abrasion of rubber tires and construction cost are lowered, the service life of a vehicle is prolonged, and operation and maintenance cost is lowered. The implementation method is a huge innovation in a true sense and has great significance in boosting the development of the straddle type monorail transport.
Owner:BEIJING JIAOTONG UNIV
Device and method for detecting bending degree of steel structure cross beam
ActiveCN109991101AReduce labor costsEasy to operateMaterial strength using steady bending forcesStress pointArchitectural engineering
The invention discloses a device and a method for detecting bending degree of a steel structure cross beam, and relates to the technical field of steel structures. The device comprises a mounting base, wherein two symmetric supporting plates are fixedly arranged on the upper surface of the mounting base; a fixing plate is arranged on the upper parts of the supporting plates; the upper surface of each supporting plate is fixedly connected to the bottom surface of the fixing plate; a pressing detection mechanism is fixedly arranged on the bottom surface of the fixing plate; a supporting mechanism is fixedly arranged on the upper surface of the mounting base; and the pressing detection mechanism comprises a movable plate, pressing plates, rollers, a pressing rod and an arc-shaped block. According to the device and the method for detecting the bending degree of the steel structure cross beam, the detection device can simultaneously detect multiple stress points of the steel structure crossbeam through the arrangement of the pressing detection mechanism and the supporting mechanism, a problem that the next stress point of the steel structure cross beam is detected after a worker movesthe steel structure cross beam in order to reduce the labor cost of the worker can be effectively avoided, and the operation is convenient.
Owner:曾庆雪
Apparatus for measuring acute stress
A method and apparatus are provided to quantify psychological and physiological components to measure acute stress in humans, in which a stimulus can be applied to the test subject's environment during the test. The method involves multiple stress / relaxation intervals while physiological measurements are taken and “measured,” and involves questionnaires that are answered after each of the intervals to “measure” the test subject's psychological state. A computerized testing apparatus acquires the physiological measurements, and also is used by the test subject in answering the questionnaires. The “stimulus” can be a fragrance, flavor, product, or task, and a “blank stimulus” is normally used during one of the stress intervals.
Owner:THE PROCTER & GAMBLE COMPANY
Pressure test method, test server, management server and system
PendingCN109359033AExpand stress testing capabilitiesShorten the timeSoftware testing/debuggingNetwork addressingNetwork address
The invention discloses a pressure test method, a test server, a management server and a system. The pressure test method comprises the following steps: a pressure test tool is packaged into an application container engine by the test server as a pressure test node, and the network address and configuration information of the pressure test node are sent to the management server. According to the configuration information of multiple stress test nodes, the management server splits the external input test tasks and obtains the test files corresponding to each stress test node. each test file issent to the corresponding stress test node according to the network address of the plurality of stress test nodes; A test server controls that stress test node to execute the test file to obtain testdata; the stress test node is controlled to send the test data to the management server; A management server acquires and store test data obtained from tests perform by multiple stress test nodes.
Owner:ALIBABA (CHINA) CO LTD
Endoprostheses with strut pattern having multiple stress relievers
An endoprostheses for implanting in a body lumen, such as a coronary artery, peripheral artery, or other body lumen can be formed with a structure, referred to as a stress reliever, designed to distribute and reduce the amount of strain which can act on the movable struts of the stent. Stress relievers can be disposed at a strut junction where one end of a strut is attached to the end of an adjacent strut. The positioning and shape of the stress reliever help to distribute the amount of strain that would otherwise be exerted on the movable struts as the struts move relative to each other. As a result, there is less possibility that the struts will fracture at the strut junction when the struts move from a collapsed position to an expanded position.
Owner:ABBOTT LAB INC
Semiconductor device with multiple stress structures and method of forming the same
ActiveCN103066124ASemiconductor/solid-state device manufacturingSemiconductor devicesMULTIPLE DISLOCATIONSSemiconductor materials
A semiconductor device with multiple dislocation structures and a method for fabricating the same are disclosed. The exemplary semiconductor device includes gate structure overlying a top surface of a semiconductor substrate and a first gate spacer disposed on a sidewall of the gate structure and overlying the top surface of the substrate. The semiconductor device further includes a crystallized semiconductor material overlying the top surface of the semiconductor substrate and adjacent to a sidewall of the first gate spacer. The semiconductor device further includes a second gate spacer disposed on the sidewall of the first gate spacer and overlying the crystallized semiconductor material. The semiconductor device further includes a first stressor region disposed in the semiconductor substrate and a second stressor region disposed in the semiconductor substrate and in the crystallized semiconductor material.
Owner:TAIWAN SEMICON MFG CO LTD
Horizontal force self-balancing type splayed heavy type upper air support system and installation method thereof
InactiveCN105544398AImprove carrying capacityReduce adverse effectsBridge erection/assemblySupporting systemHorizontal force
The invention discloses a horizontal force self-balancing type splayed heavy type upper air support system and an installation method thereof. The system comprises multiple stress units arranged at intervals. The stress units are connected through connecting rods. Each stress unit comprises an upper steel corbel, a lower steel corbel, a splayed steel frame, a horizontal supporting rod and an oppositely-pulling prestress inhaul cable, wherein the upper steel corbel and the lower steel corbel are embedded in bridge body tower columns on the two sides, the two ends of the splayed steel frame are correspondingly arranged on the upper steel corbel and the lower steel corbel, and the horizontal supporting rod is connected between the lower ends of the splayed steel frame. The support system is supported on the tower columns, so that a huge and complex support system of a landing support is omitted. The support system is large in bearing capacity and application span and no disadvantageous horizontal force is generated to the bridge body tower columns; and the support system is formed by connecting the units and through the combination of the units, the support system can be suitable for beams of different widths.
Owner:CHINA CONSTR COMM ENG GRP UNITED
Stress-distribution detecting semiconductor package group and detection method of stress distribution in semiconductor package using the same
InactiveUS7735375B2Solid-state devicesForce measurement using piezo-electric devicesStress distributionElectricity
A disclosed stress-distribution detecting semiconductor package group includes multiple stress-distribution detecting semiconductor packages each formed by resin-encapsulating a stress detecting semiconductor chip of the same size using an identical resin encapsulation structure. Each stress detecting semiconductor chip includes a piezoelectric element for stress detection and at least two electrode pads electrically connected to the piezoelectric element to measure an electrical property of the piezoelectric element. The piezoelectric elements of the stress detecting semiconductor chips are respectively disposed on the corresponding stress detecting semiconductor chips to be located at different positions from one another when superimposed on a single imaginary semiconductor chip plane having the same plane size as that of the stress detecting semiconductor chips.
Owner:RICOH ELECTRONIC DEVICES CO LTD
Method and apparatus for detection and characterization of mechanical damage
Owner:JENTEK SENSORS
WRKY transcription factor for regulating and controlling aging of leaf blades and multiple stress tolerance and application thereof
InactiveCN102964440AAnti agingIncrease productionPlant peptidesFermentationNucleotidePlant genetic engineering
The invention belongs to the technical field of plant gene engineering and specifically relates to a WRKY transcription factor for regulating and controlling aging of leaf blades and multiple stress tolerance and an application thereof. A plant WRKY6 protein provided by the invention is derived from arabidopsis, rape and other species, but is not limited to the species, and the plant WRKY6 protein comprises an analogous protein, wherein the homeology of the analogous protein with AtWRKY6 (the amino acid sequence is as shown in SEQ ID NO: 2) in the arabidopsis is higher than 30%. An encoding gene of the arabidopsis WRKY6 protein is one of the following nucleotide sequences: (1) SEQ ID NO: 1 in a sequence table; and (2) polynucleotide with the amino acid sequence as shown in the SEQ ID NO: 2 in a coded sequence table. The invention can provide a protein resource and a method in the aspects of deferring the aging of the leaf blades and improving the yield, quality and multiple stress tolerance of crops.
Owner:FUDAN UNIV
Reliability life evaluation method of long-life electronic device under multiple stresses based on depth belief network
InactiveCN108664690AImprove applicabilityImprove general performanceDesign optimisation/simulationNeural architecturesDeep belief networkStatistical analysis
The invention discloses a reliability life evaluation method of a long-life electronic device under multiple stresses based on a depth belief network, which estimates reliability characteristics by obtaining device failure data under different environmental stresses through an accelerated life test, and then establishes a reliability derivation model to complete the reliability life derivation under a constant stress level. The evaluation method comprises the following steps: firstly, determining the environmental stress which affects the working reliability of the electronic components; secondly, designing the accelerated life test; thirdly, performing statistical analysis in the test data to obtain the reliability life estimated values of components under different stress levels; and finally, determining the reliability derivation model by using the accelerated life test data. The invention solves the problems of sample shortage and limited test time, adopts a novel constant stress reliability characteristic derivation model, solves the problem that the traditional single stress estimation method is prone to model nesting risk, and realizes the establishment of the life derivation model under multiple stress levels.
Owner:BEIJING UNIV OF TECH
Multiple stress concentrated type MEMS bionic hydrophone
InactiveCN105716705AResolve blurRealize compound rangeSubsonic/sonic/ultrasonic wave measurementUsing electrical meansStress concentrationSensor array
The invention relates to a multiple stress concentrated type MEMS bionic hydrophone, and solves the problems including that a present MEMS bionic hydrophone can only measure vector information of a sound field, is relatively low in flexibility and frequency response bandwidth and is fuzzy in port and starboard. The hydrophone comprises a bottom silicon layer, an oxide layer and a top silicon layer, four tetra-beam cilium type acoustoelectric transduction structures are distributed in the top silicon layer uniformly, the bottom of each tetra-beam cilium type acoustoelectric transduction structure includes a cavity, each of the two ends of each cantilever beam is provided with a settling tank and an internally shrunk gap, the four cavities are distributed uniformly on the oxide layer, the top silicon layer is sputtered with upper electrodes at positions facing the cavities respectively, the bottom silicon layer is sputtered with lower electrodes at positions facing the cavities respectively, and each upper electrode is surrounded by four oil filling holes which are distributed in the top silicon layer uniformly. The hydrophone of the invention is simple in structure, greatly widens the effective frequency band range, provides convenience for installation and test by monolithic integration, improves the installation precision, uses a single sensor to realize a sensor array in small size, and overcomes the problem that different hydrophones in a traditional array are inconsistent.
Owner:ZHONGBEI UNIV
Semiconductor luminescent device or module online multifunctional test system and method
ActiveCN103364032AAccurate predictionSolid experimental theoretical foundationDiode testingSemiconductor operation lifetime testingAccelerated agingMultiple stress
The invention discloses a semiconductor luminescent device or module online multifunctional test system and method. The system comprises an electrical characteristic generation and test device, a plurality of light characteristic detection and control devices, an optical signal processing and analyzing device, a plurality of thermal characteristic detection devices, a central monitoring and processing computer, a multi-channel driving integrated control device, a plurality of acceleration multiple stress control device and a plurality of LED device-module load device. By means of the semiconductor luminescent device or module online multifunctional test system and method, the function that accelerated aging and in situ online monitoring test are conducted simultaneously in the multiple stress accelerated aging environment is achieved.
Owner:INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
Method and Apparatus for Detection and Characterization of Mechanical Damage
ActiveUS20140182389A1Force measurement by measuring magnetic property varationUsing electrical meansStress levelPeak value
Yield stress is an important indicator of the strength of a component such as a pipe section. A method and apparatus for measuring yield stress of components made from magnetic materials is provided. The magnetic permeability of the material is recorded at multiple stress levels below yield establishing a permeability-stress relationship. The yield stress is then estimated as a function of the recorded permeability-stress relationship. The permeability stress relationship may be non-linear for a range of stress levels, achieving a peak permeability response for a stress below yield. The yield stress may be estimated as a multiple of the stress at which the peak permeability response is recorded.
Owner:JENTEK SENSORS
Simulation test method of coal and gas outburst in coal-series rock stratum containing faults
ActiveCN109991391AEasy to installFlexible impact load test methodEarth material testingStress inducedStress conditions
Owner:CHONGQING UNIV
Adjustable multiple stress induced cracking device for concrete
The invention provides an adjustable multiple stress induced cracking device for concrete. A test device is internally provided with a steel crack induction unit. The induced cracking device is characterized in that the test device adopts a bottomed steel frame with adjustable height; the steel crack induction unit with adjustable angles and height is adopted and is laid along the length direction of the bottomed steel frame with adjustable height; meanwhile, the effective height of the bottomed steel frame is larger than the height of the steel crack induction unit. By adjusting the height of the steel crack induction unit and the bottomed steel frame, the device farthest weakens the effects of the maximum grain size of coarse aggregates on the cracking test results and realizes the adjustability of induced crack initiation force. The device realizes test on the anti-cracking performance of the concrete with maximum coarse aggregate grain size not more than 40mm and has the characteristics of high testing accuracy, wide applicability, simple operation and the like. Under the premise of ensuring the testing accuracy, the device shortens the testing time and reduces the randomness of occurrence of concrete cracks.
Owner:NANJING HYDRAULIC RES INST THE MINISTRY OF WATER RESOURCES THE MINIST
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