405 results about "Stress testing" patented technology

This invention provides methods and systems for extracting cardiac parameters, including ventricular wall motion, from a plethysmographic signal is provided. Additionally, the invention provides a wide range of uses and system configurations for cardiac monitoring, including ambulatory uses, uses for stress testing, uses for monitoring first responder personnel, and the like.

Various implantable medical devices (IMDs) are disclosed for implantation in a patient. The IMD includes pacing circuitry configured to selectively produce pacing pulses at a programmable pacing rate. In one embodiment, the IMD is configurable to subject a patient to a stress test. The IMD may be configurable to subject the patient to the stress test at the time specified by stored timing information, or in response to a signal (e.g., from a patient activator). Another embodiment of the implantable medical device (IMD) includes sensor circuitry, a memory for storing data, and a control unit. The sensor circuitry produces sensor data relating to cardiac condition. The control unit is configurable to store the sensor data in the memory until a trigger signal is received. Methods are described for performing a stress test in a patient with an IMD, and for subsequently reproducing cardiac operational states.

The invention provides a low permeability gas reservoir turning repeated fracturing technological method. The specific technological method comprises the following steps of gas well initial fracturing failure or low-efficiency reason analyzing, reservoir stratum evaluating conducted before turning repeated fracturing, turning repeated fracturing well selection and stratum selection decision making, rock mechanical parameter and ground stress testing, turning repeated fracturing ground stress field changing simulating, fracture geometrical parameter and flow conductivity optimizing, turning repeated fracturing technology optimizing, fracturing liquid and turning agent studying, repeated fracturing constructing and evaluating conducted after repeated fracturing. The well selection and stratum selection decision making and residual gas detecting serve as verification systems of each other, fracturing design and fracture detecting serve as verification systems of each other, and a novel fracture turning agent is used in the low permeability gas reservoir turning repeated fracturing technological method. The integrated design of the low permeability gas reservoir turning repeated fracturing is achieved, and the low permeability gas reservoir turning repeated fracturing technological method has the advantages that the design links are macroscopically integrated, local innovation is achieved, linkage is close, mutual verification is achieved, the design is advanced, and the technological advantage is obvious.

The invention relates to a coal-rock mass ground stress continuous testing device and a method thereof which are mainly used for testing the stress and change regularity of rock in place or crushed coal-rock mass. The device consists of a ground stress sensor, a data acquisition instrument and a high pressure oil pump, which can work separately and can be connected with the data acquisition instrument to work. The ground stress sensor consists of a preposing capsule pressure sensor (1), a high-pressure oil tube (2), a tee (3), an electronic digital display hydraulic sensor (4), a valve (5) and a quick change coupler (6); wherein, the capsule pressure sensor is arranged inside a borehole, and can be well coupled with the coal-rock mass by injecting oil liquid; the ground stress testing results can be directly displayed on a pressure gauge; the sensor can be directly connected with a coal mine safety monitoring system, or the data can be acquired by the data acquisition instrument for remote data transmission, or telephone wires can be used for the communication between the sensor and ground modem as well as a computer; in ground-based computer software, the ground stress data and the change regularity thereof can be looked over.

Example embodiments include a method for massive parallel stress testing of resistive type memories. The method can include, for example, disabling one or more internal analog voltage generators, configuring memory circuitry to use a common plane voltage (VCP) pad or external pin, connecting bit lines of the memory device to a constant current driver, which works in tandem with the VCP pad or external pin to perform massive parallel read or write operations. The inventive concepts include fast test setup and initialization of the memory array. The data can be retention tested or otherwise verified using similar massive parallel testing techniques. Embodiments also include a memory test system including a memory device having DFT circuitry configured to perform massive parallel stress testing, retention testing, functional testing, and test setup and initialization.

The subject invention relates to systems and methods for automatically testing and stressing computer components on a plurality of computer systems. In one aspect, a system is provided to facilitate software testing of a computing environment. The system includes one or more profiles that describe software actions related to operations of a computing system, wherein the actions can be specified from usage data gathered or modeled from various sources. A weighting component specifies likelihoods of the software actions in order to more closely test or model actual operations of the computing system, whereby a test selection module employs the likelihoods to determine software tests that exercise the software actions in order to predict future behavior of the computing system.

The invention relates to an expansion / shrinkage stress testing device for a cement-based material, which comprises an inner circular ring and an outer circular ring which are coaxial and have the same height, and a stress testing device and a data acquisition device which are electrically interconnected, wherein the inner circular ring and the outer circular ring are made of the same material; and the stress testing device comprises a plurality of test stress plates which are distributed evenly along the circumferential direction on the outer surface of the outer circular ring and the inner surface of the inner circular ring and are electrically connected with the data acquisition device. When the testing device is used, the cement-based material (such as pure slurry, mortar or concrete) is cast between the two rings. The expansion and shrinkage stress can be calculated according to the analysis of material mechanics by measuring the stress. Compared with the prior method, the testing device has the main advantages that: a, the testing device is simple, and simple and convenient to operate; b, the restraint stress is even; and c, the testing of starting self water addition molding can be implemented, the testing process needs no manpower to move the test piece, and continuous and automatic test can be realized.

An integrated circuit structure and method provides a burn-in stress test mode that facilitates stress testing of an integrated circuit device in a burn-in oven. The integrated circuit structure and method is capable of disabling a time-out feature of an IC memory device during a stress test mode of the device in order to facilitate stress testing of the device in a burn-in oven. The integrated circuit structure provides for entry into the burn-in stress test mode when a supply voltage supplied to the integrated circuit device exceeds a predetermined voltage level and / or the temperature of the integrated circuit device exceeds a predetermined temperature level.

The invention discloses a stress and emotion regulating method and system in order to overcome the disadvantages in an existing HRV biofeedback training system. The stress and emotion regulating system comprises a stress testing unit for acquiring the stress test result; a regulating unit for offering correspondent regulation proposal from multiple preset regulation proposals to implement relative to different stress test results; a physiologic signal collecting unit for collecting a physiologic signal representing the heart rate on a real-time basis, a physiologic signal representing the saturation of blood oxygen, and a physiologic signal representing the pulse intensity as the feedback signal for regulation during the implementation of the regulation proposal, and converting the feedback signal into a feedback parameter value; and a data processing unit for generating the regulated result based on the feedback parameter value. The invention also provides a physiologic signal collecting device for collecting three physiologic signals of the heart rate, the saturation of blood oxygen and the pulse intensity of a human body closest to the stress and the emotion so as to help a user to carry out regulation train.

A test circuit disposed between a common bus and the cores of a multi-core computer permits post-silicon validation in the form of controlled stress testing of the system. The test circuit may block data requests from one or more selected cores and issue test data requests into the system instead, resulting in a more controllable test environment. In one embodiment, the test circuit is programmed and monitored from an external device through an integrated test port.

Methods and systems of testing an operating system are described. The operating system is invoked to create a process, the process having a first thread. A test function is repetitively executed in a first thread of the process. These steps are repeated to create processes and to execute the test function in parallel and repetitively in the first thread of the created processes until a given condition is satisfied. For example, the given condition can be a condition in which the operating system resources are exhausted.

A virtual oven efficiently conducts stress testing of large numbers of modules. The virtual oven includes a logical grouping of modules, a controller, test instruments and a database which are all connected via a network. The logical groupings of modules of several virtual ovens may be physically accommodated within a single environmental stress screening room. Switching between modules in a logical group permits a single test piece of test equipment to be time-shared among the modules in the logical group. The method of bum-in testing a logical group of modules rotates a test sequence, including passive and active test cycles, between the modules. A test signal is split and supplied to multiple modules. Passive testing may be performed by monitoring parameters of the module while the test signal is supplied to the module. Active testing may be a functional test of the module in which the test signal is supplied to, processed by, and output from the module. Such test signals output from the modules are switched to the test equipment on a time-share basis. In this way, the number or expensive test equipment set-ups may reduced. The controller for each virtual oven also generates displays so that a user can track the test progress of all modules within the virtual oven. The controller also builds a database of the active and passive tests for each module. A graphical user interface may be used to interact with the virtual oven, control the testing, and view the database.

Execution of a test scenario is managed where the test scenario is for testing a website deployment having a server in communication with a backend application. A testing interface is established at a client in communication with the server to concurrently incite requests from the client to the server. The test scenario includes at least one test case and each test case includes at least one request. Requests for the backend application received from the client are then processed. The processed requests are provided to the backend application for fulfillment thereof. A failure of the fulfillment of the requests is identified. An outline of status information on fulfillment of the requests is provided to the testing interface. The outline of status information may include information on the failure.

The invention belongs to the technical field of building construction stress testing and relates to a method for testing the pile shaft stress of a static pressure high-strength pre-stressed concrete pipe pile. When tensile force or pressure is received by a fiber Bragg grating sensor, the optical fiber grating period is changed due to the extension or the compression of the sensor, and therefore the effective refraction rate of the FBG sensor is changed. According to the axial strain of one section of the high-strength pre-stressed concrete pipe pile, the pile shaft stress of the static pressure high-strength pre-stressed concrete pipe pile is obtained, and therefore the axial force of a pile shaft, the side friction and the pile tip resistance are obtained. The method for testing the pile shaft stress of the static pressure high-strength pre-stressed concrete pipe pile is simple, convenient to operate, high in measuring accuracy, high in sensitivity, strong in electromagnetic field interference resistance, high in rate of survival, and capable of achieving quasi-distributed and automatic monitoring easier compared with a method of a traditional force testing element.

The invention discloses a method for locating and installing a deep soft rock geostatic stress testing device. According to the method, a stress sensing column is manufactured, the stress sensing column is a cement concrete cylinder comprising two three-directional pressure boxes, and the center of each cubic pressure box is located on the medial axis of the cylinder; the front end of a push rod is connected with the stress sensing column, an angle testing device is installed, rotation angle and length of the stress sensing column are recorded when the push rod is pushed from a hole mouth to a tested point at the hole bottom, and accurate data necessary for stress resolving can be obtained. According to the method, no sharp protrusion exists at the front end or the side face of the stress sensing column, the hole wall will not collapse easily in the pushing process, relative positions of a pair of three-directional pressure sensors are fixed through the stress sensing column, the two three-directional pressure sensors will not move or rotate relatively in the pushing process, and the accuracy for calculating the geostatic stress of the tested point can be ensured.

Macrophage migration inhibitory factor (MIF) is a clinically useful biochemical marker of cardiovascular risk. Risk assessment includes the step of detecting in the blood of a person MIF concentration as a marker of cardiovascular risk for the person. The method may further comprise the step of assigning to the person a cardiovascular risk metric proportional to the MIF concentration, and / or prescribing for the person a cardiovascular treatment modality in accordance with the MIF concentration. The method is useful as a primary screen, and may be used in conjunction with or as a substitute for additional tests, such as a stress test, CRP assay, LDL assay, etc. The detecting step may be repeated over time intervals and / or treatment to monitor change in cardiovascular risk for the person over time and / or treatment.

Execution of a test scenario is managed where the test scenario is for testing a website deployment having a server in communication with a backend application. A testing interface is established at a client in communication with the server to concurrently incite requests from the client to the server. The test scenario includes at least one test case and each test case includes at least one request. Requests for the backend application received from the client are then processed. The processed requests are provided to the backend application for fulfillment thereof. A failure of the fulfillment of the requests is identified. An outline of status information on fulfillment of the requests is provided to the testing interface. The outline of status information may include information on the failure.

The invention discloses a three-dimensional in-situ stress testing method by acoustic emission method, comprising the following steps: 1) sampling and processing; 2) uniaxial acoustic emission test; 3) drawing a stress-accumulated acoustic emission ringing count-time curve; 4) Quickly discriminate the Kaiser effect points; 5) Calculate the three-dimensional stress state of the in-situ stress measuring points. The rock specimen sampling direction angle of the invention is flexible, the Kaiser effect point identification is quick and easy, the error in the calculation result of the in-situ stress caused by the deviation of the sampling angle is reduced, and the accuracy of the original rock stress test is also ensured.

A method provides early estimation of product life using accelerated stress testing data. In an embodiment, data measured from a product operating in a first, high-stress environment is used to predict how long the product will operate in a second, normal operating environment before failure, using an exponential acceleration model. An additional feature of the present invention provides a quantified indication of how much the product has improved from a redesign.

A chip testing system with improved thermal performance. In a preferred embodiment, a nest assembly of a chip testing apparatus includes tooling balls and a fitted frame for improving alignment of a coldplate and a chip surface. In preferred embodiments, the coldplate is of unibody design. Thermal performance is also improved by balancing the forces exerted on the coldplate using an adjustable hose mounting bracket. The bracket allows the forces exerted by the hoses on the coldplate to be adjusted so they balance and cancel other unwanted forces on the cold plate.

A testing apparatus and method for testing integrated circuits is disclosed wherein a device under test is continuously maintained at a desired set point temperature by an included thermal body. The thermal body has an enclosed phase change material which provides latent heat to the device under test such that there is negligible temperature variation realized by integrated circuits being tested.

The invention belongs to the technical field of building construction stress testing equipment, and relates to a pile body stress testing device of a static-pressure high-strength pre-stress concrete pipe pile. A shallow groove is formed in the high-strength pre-stress concrete pipe pile in a cutting mode, an optical fiber Bragg grating sensor and an armored cable are in butt fusion and in series connection in a quasi-distributed mode, the optical fiber Bragg grating sensor and the armored cable which are in series connection are implanted into the shallow groove of the high-strength pre-stress concrete pipe pile and packaged and protected through epoxy resin mixed liquid, the optical fiber Bragg grating sensor is distributed at the position of the high-strength pre-stress concrete pipe pile according to the elevation of a soil layer needing to be tested, a pile body drilling hole is formed in the inner side of the top of the high-strength pre-stress concrete pipe pile, and the armoured cable is led out through the pile body drilling hole and is communicated with a data collecting system. The device is simple in structure, convenient to operate, high in measurement precision and sensitivity, strong in the capacity of resisting electromagnetic field interference and high in survival rate; compared with a traditional stress measurement element, the pile body stress testing device can easily achieve quasi-distributed and automatic monitoring.

The invention discloses an anchoring interface stress testing device and a testing method thereof. The anchoring interface stress testing device comprises a loading system and a loading device, wherein the loading system is a bidirectional loading hydraulic testing system and comprises a lateral loading cylinder, a bottom loading cylinder and a hydraulic pump station; and the loading device comprises a loading frame and a clamping column barrel installed in the loading frame and used for clamping an anchor rod force measuring test piece. When the anchor rod interface stress is tested, the anchoring body bears the bottom push load under transverse clamping action through the design of the structure on a testing platform. The testing method not only ensures the transverse constraint force of the anchoring rod, but also realizes the process of transferring force from the base body to the direction of the anchoring body. The process is consistent to the actual stressing condition of the anchoring rod in engineering.

The invention provides a device used for mechanical property testing of a high-temperature superconducting strip, and includes a four-lead control device (1), a strip critical current testing frame (2), a strip turning radius testing frame (3) and a strip stretching stress testing frame (4). The device has the following advantages: 1. through the device, accurate measurement of almost all electrical and mechanical properties of a short sample of a strip can be completed, including a turning radius, stretching stress, delaminating stress and the like, and the device has complete functions and is convenient to use; 2. equipment is complete in design, is practical and humanized, a person can seat on a table surface to carry out processes of welding, testing and the like, and the whole process is easy; 3. a square hole plate mounted on a table top can accommodate various test sample holders, screws, tools and the like, and is convenient and practical; and 4. the test sample holders can reasonably and effectively support measurement of samples.

The invention discloses a soft rock multi-measuring-point ground stress testing method by using a connecting rod. During working, a plurality of groups of three-way pressure boxes (each group has two pressure boxes) are closely fixed on the connecting rod by using locking screws and multiple connecting rod sections are sequentially installed and operated till all measuring point three-way pressure boxes are pushed to a design position; the connecting rod is also used as a grouting pipe, full-hole grouting is performed, the stress to the three-way pressure boxes is measured and resolved to obtain stress components Sigma'(x), Sigma'(y), Sigma'(z), Tau'(xy), Tau'(yz) and Tau'(zx) of each pair of three-way pressure boxes at positions in a hole under a drill hole local coordinate system, then a cylindrical double-medium mechanical model is established, and stress components Sigma (x), Sigma (y), Sigma (z), Tau (xy), Tau (yz) and Tau (zx) of an in-situ stress field of the position of the drill hole are obtained by adopting a numerical simulation method through iterative convergence. Since the connecting rod used in the method is also used as the grouting pipe, uniform grouting is realized, grout mediums in the hole are uniform and the calculation is simpler and more convenient to perform; the ground stress values of multiple measuring points in deep soft rock can be directly measured and the continuous monitoring of the ground stress is realized.

A method for intelligently rebuilding a RAID includes subjecting a storage drive in an existing RAID to a stress workload test by placing the storage drive in a RAID 1 configuration with a spare storage drive. In the event the storage drive fails the stress workload test but can still be read, the method uses the RAID 1 configuration to copy recoverable data from the failing storage drive to the spare storage drive. The method uses other storage drives in the existing RAID to reconstruct, on the spare storage drive, data that is not recoverable from the failing storage drive. Either before or after all non-recoverable data has been reconstructed on the spare storage drive, the method logically replaces, in the existing RAID, the failing storage drive with the spare storage drive. A corresponding system and computer program product are also disclosed.

Disclosed is an integrated circuit (IC) chip with a built-in self-test (BIST) architecture that allows for in the field accelerated stress testing. The IC chip can comprise an embedded processor, which selectively alternates operation of an on-chip test block between a stress mode and a test mode whenever the IC chip is powered-on such that, during the stress mode, the test block operates at a higher voltage level than an on-chip functional block and such that, during the test mode, the test block operates at a same voltage level as the functional block and is subjected to testing. Also disclosed are a system, method and computer program product which access the results of such testing from IC chips in a variety of different types of products in order model IC chip performance degradation and to generate IC chip end of life predictions specific to the different types of products.

The invention provides a design method for an integrated stress, acceleration and service life testing profile of an astronautic drive component, which can be applied in the field of improving the reliability of the astronautic drive component. Based on determination of the existing conventional service life testing profile, a thorough test is carried out at first to determine the extreme stress with no changes in the failure mechanism of the astronautic drive component, then the stress is divided into a plurality of stress levels to determine the one-time cycle time of the stress and design the integrated acceleration and stress testing profile, the stress needs to be increased if good effects of acceleration cannot be achieved by the testing profile, the profile of the added stress is prepared according to the cumulative damage theory and is superimposed with the existing testing profile to obtain the final integrated stress, acceleration and service life testing profile, and samples can be tested through the testing profile. While the failure mechanism of the astronautic drive component cannot be changed, the acceleration and service life of the astronautic drive component can be tested, and good effects of acceleration can be achieved.