240 results about "Sensitivity test" patented technology

The invention relates to a system for calibrating receiving performance of a partial-discharge ultrahigh frequency detection device, and the system comprises a giagahertz transverse electromagnetic cell (GTEM) transmission cell, a standard pulse generator, a measure and control computer and a high-speed broadband oscillator, which are sequentially connected with one another through a conducting wire, wherein the high-speed broadband oscillator transmits a branch signal to the GTEM transmission cell, the top of the GTEM transmission cell is provided with a special test window which is provided with a reference sensor and a tested sensor, and the reference sensor and the tested sensor are respectively connected with the high-speed broadband oscillator. The invention also relates to a calibration method by adopting the system. The calibration system and the calibration method have a broadband property and low cost, and not only can be used for electromagnetic radiation sensitivity test, but also can be used for the electromagnetic radiation test; and moreover, the instruments used in the system and the method are simple to configure, low in cost and capable of being used for rapid and automatic test.

The invention belongs to the field of nondestructive detection, and particularly relates to a power station thick-walled pipeline ultrasonic guided wave detecting method, wherein the method comprises the following steps of: selecting an ultrasonic guided wave detecting probe; selecting an ultrasonic guided wave detecting instrument; manufacturing a sensitivity test block; making a distance-amplitude curve; scanning; carrying out flaw size measurement; and verifying and grading detecting results. The detecting method is suitable for comprehensively detecting the flaws of pipelines with different pipe diameters and thicknesses, and is particularly suitable for comprehensively detecting power station thick-walled pipelines. The detecting method has the characteristics of rapidness, simpleness, safety and reliability, can overcome some limitations of a conventional nondestructive detection method, lowers the manual detection intensity and saves human and material resources.

The invention belongs to nondestructive testing technology, and relates to a method for manufacturing a surface crack sample for a nondestructive testing sensitivity test. The method adopts a fatigue loading mode to manufacture a crack defect, and the operation is simple; the manufactured fatigue crack defect has small dimensions and belongs to typical crack defect. Therefore, the manufactured fatigue crack defect has excellent representativeness for natural crack defects. The method can successfully acquire crack samples with dimensions of natural cracks; and dimensions and shapes of the samples and directions and positions of the crack defects can meet most test requirements. The manufacturing process is easily controlled, which is particularly applicable to adjustment and experimental verification for circumferential magnetization detection sensitivity in magnetic particle testing, and the method can be applied to testing research of detecting sensitivity of the surface cracks in three nondestructive testing specialities, namely ultrasound, vortex and penetration.

The invention relates to a bored pile concrete interface monitoring device which is designed through an electrical impedance physical property testing method for media such as concrete, slurry and water in the bored pile underwater concrete pouring process and sensitivity test analysis and through researches on the testing method and instrument for an underwater electrical impedance testing probe and underwater concrete pouring elevation positioning. The bored pile concrete interface monitoring device comprises a ground host, a probe electronic cavity, a push rod arranged on the top of the probe electronic cavity, an insulation rod arranged at the bottom of the probe electronic cavity, a first electrode, a second electrode, a resistance value measuring module and an analog-digital converter, wherein the first electrode and the second electrode are fixedly connected to the insulation rod in a sleeving mode, and the resistance value measuring module and the analog-digital converter are arranged in the probe electronic cavity. According to the key technological principle, in the pouring process of a pouring hole, the electrical impedance of water and slurry is obviously different form that of the concrete, and the positioning of the concrete pouring interface (or depth) is achieved by measuring the difference.

A plastic ball grid array package is designed to pass the JEDEC Level 1 Moisture Sensitivity Test (the "popcorn test"). The plastic ball grid array design minimizes contact between a mold compound/encapsulate/glob top and metal surfaces. The present plastic ball grid array design maximizes contact between the mold compound/encapsulate/glob top and either the laminate core or the solder resist in order to take advantage of this strong bond which will help disable delamination. Furthermore, solder resistive material overlaps the interface between metal surfaces and the laminate core.

The invention provides an EMC (Electro Magnetic Compatibility) test method of a deep space aircraft coupling. The method comprises the following steps of: turning off power of each detector consisting of the aircraft coupling, calibrating EMC test equipment, and testing the background noise of an anechoic chamber; carrying out the electromagnetic radiation and sensitivity test on each detector; analyzing test data of each detector; determining the suppression condition of mutual interference between detectors of the aircraft coupling; and carrying out the EMC test on the aircraft coupling. For the source of electromagnetic interference, by adopting a test method from the point to the surface, the EMC characteristics of the deep space aircraft couplings can be quickly, reliably and safely detected, the source of electromagnetic interference is determined, the electromagnetic interference and the failure are safely and reliably detected, and the EMC test efficiency of the deep space aircraft coupling is improved.

The invention discloses an improved oblique-Y-shaped groove welding crack sensitivity test sample and a manufacturing method thereof. The sample comprises a test welding line located in the middle of the sample and does not include a restraint welding line, wherein a groove applied to the test welding line is oblique-Y-shaped; the root gap of the groove is 2mm+/-0.1mm. Through the sample, the restraint welding line is eliminated; the groove applied to the test welding line and the root gap are directly processed in the middle of the sample by using a mechanical method; the accuracy of the root gap can be greatly improved; residual stress and angular deformation are not generated; the reliability of test result of welding crack sensitivity of the material is improved; meanwhile, the consumption of manpower and financial resources can be reduced.

The invention relates to a submerged-arc welding technology of a big-thickness low-temperature steel plate with yield strength of 690MPa grade. The method comprises the following steps: (1) carrying out a welding cold crack sensitivity test on the steel plate to confirm the needed lowest preheating temperature; (2) adopting a welding groove with a symmetrical double-U shape, wherein the groove angle is 25-35 degrees, the thicknesses of truncated edges are 3-5mm, and the gaps between the truncated edges are 1-2mm; (3) adopting a welding wire with the tensile strength of more than or equal to 830MPa and the impacting energy of more than or equal to 100J at the temperature of -60 DEG C; (4) controlling the welding current to be 450-680A, the welding voltage to be 29-36V, the welding speed to be 38-50cm/ min, the weld heat input to be 15-40kJ/ cm and the flux baking system to be 350 DEG C*2.5h; (5) adopting gas shield welding with a single-sided welding and two-sided molding STT technology to carry out backing weld, and then carrying out unfolding submerged-arc welding until the steel plate is fully filled. All mechanical properties of a welding joint obtained by the method meet the requirements of the classification society, and particularly, a weld seam area and a welding heat affected zone can maintain higher low temperature impact toughness.

The invention discloses an in-vitro individualized medicine test method for lung cancer and a culture medium, and belongs to the field of cell biology and pharmacology. The in-vitro individualized medicine test method and the culture medium have the advantages that the culture medium M can be applied to normal epithelial cells and primary tumor cells of human or mammals, accordingly, in-vitro culture systems for tumor cells and para-carcinoma cells of lung cancer patients can be established, and primary cells, with continuous passage and quick proliferation functions, of patient individuals can be obtained; the culture systems can be used for detecting the sensitivity and the safety of medicines or combination groups of the medicines, and accordingly stable, accurate and reliable lung cancer individualized treatment-medicine sensitivity test standard detection process systems can be established; individualized sensitive chemotherapy medicines or compositions screened by the aid of the lung cancer individualized treatment-medicine sensitivity test standard detection process systems can be combined with clinical medicine or relevant subjects, accordingly, clinical individualized treatment schemes can be formulated, and the in-vitro individualized medicine test method and the culture medium can ultimately serve for clinical application.

Apparatus for optically testing LEDs or other light-emitting components in a wide variety of test environments and to the degree necessary pertinent to the type(s) of faults encountered. In one embodiment, the present invention includes one or more fiber optic probes coupled to a multi-mode sensor unit, incorporating a photo-sensor coupled to a processor which may be programmed to provide a variety of test modes including simple on/off testing, color determination, color matching, wavelength and relative intensity among others. An extremely high sensitivity test mode is also provided for testing LEDs which emit very low intensity light in the micro-candela range in products such as automobile/aircraft cockpit control panel lighted push-buttons for night-time viewing. The multi-mode sensor unit operates over a wide dynamic range and is capable of accurately testing LEDs that may be very dim to very bright without adjustment. In another embodiment, a voltage protection circuit is provided which enables the multi-mode sensor unit to safely operate from a supply voltage in the range of approximately 5 volts DC to approximately 40 volts DC while protecting the multi-mode sensor unit from a potentially damaging overvoltage condition. The voltage protection circuit also protects the multi-mode sensor unit against potential damage caused by reverse polarity voltage spikes, or accidental steady-state reverse polarity voltages.

The invention provides a solar-blind ultraviolet camera ultraviolet light detection sensitivity test system and a test method. A laser pumped broadband light source generates broadband white light with high brightness and high stability and the light is emitted to a double-cascade monochrometer system. Under control of a computer, the double-cascade monochrometer system generates needed ultraviolet monochromatic light. The monochromatic light output by the monochrometer passes through an integrating sphere and then is converted into monochromatic uniform light, the light is attenuated by an ultraviolet attenuation sheet and then is emitted to a solar-blind ultraviolet camera. Light power of the monochromatic light output by the integrating sphere can be displayed by an intelligent power meter system in real time. A photon number output by the solar-blind ultraviolet camera is collected to a computer through a serial port. If an average number of photons in a bright environment is equalto an average number of photons in a dark environment, a power density of the light emitted to the solar-blind ultraviolet camera is ultraviolet light detection sensitivity.

The invention discloses method for testing sensitivity of a wireless communication product in an ISM (Industrial, Scientific and Medical) frequency band, relating to methods for testing the sensitivity of the wireless communication products and solving the problem of low accuracy in a sensitivity test because the traditional method cannot simulate an actual condition. In a system I, signals emitted by an emitter are input into a receiver through an adjustable attenuator and a fixed attenuator. In a method I, the error rate from the adjustable attenuator to the receiver is adjusted to determine whether a preset error range is reached, and the sensitivity of the receiver is calculated. In a system II; the signals emitted by the emitter are input into the receiver after being processed by the adjustable attenuator I, a power distributor, a combiner and N adjustable attenuators II. In a method II, the reference attenuation values of the adjustable attenuators are respectively adjusted, the length of a transmission line is adjusted to make the receiver in a critical state, and a power meter is adopted to test the received signal power of the receiver and calculate the sensitivity of the receiver. The systems and methods disclosed by the invention are suitable for testing the sensitivity of the wireless communication products in the ISM frequency band.

The invention relates to a method for improving surface stress sensitivity of a resonant ultrathin cantilever beam sensor, and belongs to the technical field of micro-mechanical sensing. The method is particularly characterized in that self-assembling monomolecular sensitive films capable of identifying selection specificity can be grown on the upper surface and the lower surface of an ultrathin resonant cantilever beam sensor; after specificities of sensitive molecules and target molecules to be detected are combined, interaction among the target molecules generates surface stress on the surfaces of the cantilever beam; and the combined action of the upper surface stress and the lower surface stress causes change of elasticity coefficient of the cantilever beam so as to change inherent resonance frequency of the cantilever beam, and achieve detection for the target molecules through measuring the change of the resonance frequency. Compared with the prior method for sensitivity test by using a mass adsorption method, the method for improving the surface stress sensitivity can carry out biochemical trace test, and the sensitivity can be improved by one order of magnitude. The method has the characteristics of simple principle, high sensitivity and easy realization.

The invention belongs to the technical field of biological detection and relates to an African swine fever polymerase chain reaction (PCR) detection method and an oligonucleotide primer pair. The method comprises the following steps: designing a pair of specific primers by referring to a complete genome sequence of 23 ASFVP72 protein strains recorded in GenBank, exploring the optimal reaction system and reaction conditions according to the designed primers, performing sensitivity test, specificity test and reproducibility test on the established PCR reaction method, and performing PCR method detection on clinical samples of sows suffered from reproductive disturbance or piglets with respiratory disturbance symptoms and aborted fetuses from 14 pig farms. The test results prove that the established PCR method can sensitively and rapidly detect the African swine fever virus. The PCR detection method established in the research has high applicability and can be used for detecting the African swine fever disease.

The invention relates to a process for the research and development of a colon-bacillus composite and speedy chromogenic identification reagent. The process is characterized in that: 1. First, the quality control method is determined through activation identification and biochemical identification of coliform groups, salmonella, shigella and staphylococcus aureus; 2. Basic nutrients are selected according to the needs of target strains; 3. It is verified by the auxanogram method that proper nutrition environments, carbon sources, nitrogen sources, minerals, microelements, nutrilits, etc. are all necessary for the growth and breeding of microbes; without any one thereof, the microbes can not grow, metabolize and breed normally; 4. A visualization reagent, a masking reagent and a synergistic agent are selected; 5. Composite selection is conducted; 6. The feasibility of the composite selection formula is verified through tests, verifications and examinations on the indexes of a speedy chromogenic substrate, including the specificity test, the sensitivity test, the real sample inspection, the false negative and false positive strain identification, the stability test, the repeatability test, the competing strain and mixed bacterium interference test, the detection time and detection rate tests. 7. The most suitable formula is selected through a factor level orthogonal combination test.

The invention discloses a DHAV (duck hepatitis A virus) typing detection method based on a fluorescent quantitative PCR (polymerase chain reaction) melting curve method. The DHAV typing detection method comprises steps as follows: virus RNA (ribonucleic acid) extraction and cDNA (complementary deoxyribonucleic acid) synthesis; preparation of positive standard forms; establishment of the DHAV typing detection method based on the fluorescent quantitative PCR melting curve method; method validation adopting a specificity test, a sensitivity test and a reproducibility test. According to the DHAV typing detection method, all that is required is to add a pair of primers, A and C gene types are detected by single tube, the method is simple and feasible, and time consumption is low; the whole amplification and detection process adopts closed tube operation, so that pollution of PCR amplification products is avoided, and false positive results are reduced; amplified fragments are short, higher annealing temperature is adopted, and amplification specificity is guaranteed. The fast DHAV typing detection method is established, great convenience is provided for correct diagnosis and control of the DHAV, and economic benefits of agricultural production are achieved.

The invention discloses a method for preparing nickel oxide/zinc oxide heterojunction nanometer materials. By the aid of the method, the technical problem of low sensitivity of nickel oxide/zinc oxide heterojunction nanometer materials prepared by the aid of existing methods can be solved. The technical scheme includes that the method comprises synthesizing nickel oxide/zinc oxide heterojunction pre-sintered powder from mixed solution by the aid of a one-step hydrothermal process; calcining the nickel oxide/zinc oxide heterojunction pre-sintered powder to obtain the nickel oxide/zinc oxide heterojunction nanometer materials. The mixed solution is prepared from nickel acetate tetrahydrate, zinc nitrate hexahydrate and sodium hydroxide. The method has the advantages that the method only includes one reaction step instead of two reaction steps in the prior art, and the reaction time is shortened and is 12 h instead of the reaction time of 60 h in the prior art; as shown in gas sensitivity tests, the working temperatures of gas sensors made of the nickel oxide/zinc oxide heterojunction nanometer materials prepared by the aid of the method are lowered and are 200 DEG C instead of the working temperatures of 330 DEG C in the prior art; the sensitivity of the gas sensors for 100 ppm acetone gas is improved and reaches 15-17 instead of the sensitivity of 12 in the prior art.

The present invention relates to gene chip for the detection and subtyping of bird flu virus. The present invention establishes gene chip with high specificity, high sensitivity and great practicability for detection and subtyping of bird flu virus through designing and screening 50 pairs of specific primers, 2 universal primers, 52 specific probes and 3 quality control probes for the multiple RT-PCR subtyping detection of bird flu virus genes based on the gene sequences of different bird flu virus subtypes Genebank reports; and performing the effectiveness test, specificity test, sensitivity test and condition optimization of gene chip detection. The present invention establishes also the detection and subtyping process with the chip and gives the initial application.

The invention, relating to the technical field of a hall element, discloses the hall element of a sapphire substrate GaN/AlN/AlGaN two-dimensional electronic gas structure and a manufacturing method thereof, as well as an epitaxial material structure of the hall element of the two-dimensional electronic gas structure. The hall element disclosed by the invention can work at extreme temperatures such as above 300 degrees centigrade and below -50 degrees centigrade and the like. Meanwhile, an optimal design of area utilization rate is proposed for miniaturization and batch production. Finally technological process for manufacturing the hall element is provided. The sensitivity of the hall element can reach 7.28mV/mA*KGs through a sensitivity test. The hall element structure and the preparation method provided by the invention also can be applied to the preparation of hall elements of other substrate materials.

The invention discloses a detection evaluation method of roller surface layer grain size, and the method is as follows: using a cleaning agent for cleaning a roller to-be-detected region which is treated by surface grinding; preparing a surface wave sensitivity test block with rectangular seamed edges, choosing a surface wave probe with a frequency of 2MHz and an ultrasonic flaw detector, using the sensitivity test block for regulation of ultrasonic flaw detector sensitivity by a surface wave test block end part seamed edge method; setting the sonic path distance of the ultrasonic flaw detector to be 250mm, putting the probe in the roller surface to-be-detected region for well coupling, moving the probe at a uniform speed under the set detection sensitivity, observing waveform display changes of an oscilloscope screen, and acquiring a grass-like echo waveform; and in 20-100% sonic path distance range of the oscilloscope screen, according to the grass-like echo amplitude value, determining the roller surface grain size grade range. The method overcomes the defects of traditional metal grain size detection, improves the detection speed and simplifies the detection process, without restriction of detecting positions and destroying of a specimen, so that the roller quality can be accurately and objectively evaluated.

Disclosed are a receiving sensitivity test method, apparatus and terminal. The receiving sensitivity test method comprises: setting a test parameter of a channel to be tested; then, acquiring first power information of the channel to be tested under the test parameter; determining, according to the first power information, whether the channel to be tested has an interference signal; and if not, testing the receiving sensitivity of a mobile terminal over the channel to be tested. The solution determines whether interference exists before testing the receiving sensitivity, and tests the receiving sensitivity without interference, thus improving the test accuracy of the receiving sensitivity.

The invention discloses a microphone sensitivity test tool and system. The tool comprises a test chamber, a loudspeaker and a collecting board provided with a probe, wherein the test chamber is divided by a support baffle into a sound chamber and an operation chamber, and the loudspeaker is mounted in the sound chamber; the support baffle comprises a baffle body as well as a microphone accommodating area, a sound making hole and a sound conducting channel which are formed in the baffle body, the sound making hole and the sound conducting channel are led to the microphone accommodating area and the operation chamber from the sound chamber respectively, and the sound conducting channel is located on the periphery of the microphone accommodating area; an operation port opposite to the microphone accommodating area is formed in the operation chamber and covered by the collecting board, and the probe extends into the operation chamber. With the adoption of the tool and the system, two kinds of microphone test tools are unified, the operation cost of test lines is saved, and the accuracy and the stability of test results are also improved.