37results about How to "High reliability of test results" patented technology

The invention provides a deep beam test piece for a rock I-II composite fracture toughness test. The deep beam test piece has a rectangular main body. The main body is provided with an opening along a center line in a main body lower end surface thickness direction, and the opening extends into the main body and goes through cutting grooves arranged at the front and rear end surface along a main body thickness direction. An included angle beta of the surface of the cutting groove (2) and the cross section of the test piece main body perpendicular to the length direction is greater than or equal to 0 degree and less than or equal to 60 degrees. The width W of the test piece main body is controlled in a range of 0.5L+/-0.01L. The thickness B of the test piece main body is 0.4 times greater than or equal to the length L and is greater than or equal to 30mm. L represents the main body length. The invention also provides a rock I-II composite fracture toughness test method utilizing the deep beam test piece. The deep beam test piece has a simple structure, is conducive to rock block processing, and realizes a rock I-II composite fracture toughness test in the whole composite loading zone from the pure I-type zone to the pure II-type zone.

The invention discloses a biological particle detection system based on a gelatin detection baseband. The system comprises a sealed dark chamber, a detection box, an air path system, an optical system, a photoelectric conversion module, and an air extracting pump, wherein the sealed dark chamber is provided with an air outlet, the detection box is arranged inside the sealed dark chamber, and comprises a baseband coated with gelatin, and a baseband driving device, the air path system is provided for collecting and ejecting aerosol biological particles, the optical system comprises a LED light source and an optical lens, and is provided for aerosol biological particle monitoring analysis, the photoelectric conversion module is provided for photoelectric conversion, and the air extracting pump is provided for generating negative pressure in the sealed dark chamber. With the nozzle of the air path system, the aerosol biological particles are ejected on the baseband coated with the gelatin to form a circular aerosol biological particle sample spot for detection, the baseband driving device drives the baseband to convey the sample spot to a fixed monitoring point, the probe of the optical lens completes data acquisition of the biological particle characteristics of the sample spot. The system has the following advantages that: the control precision is high, the detection result has high reliability, the monitoring can be continuously performed for not less than 70 hours, the system is convenient to use, and the like.

The invention discloses a nonmetal substrate surface coating thickness detecting device. The device comprises a sleeve, an electrical machine fixedly arranged in the top of the sleeve, a pedestal which is arranged in the sleeve and moves vertically driven by the electrical machine, a measuring head fixedly arranged on the lower part of the pedestal, a pressure sensor located between the measuring head and a sensor. The device is used for detecting the nonmetal substrate surface coating thickness, can measure the millimeter-grade coating with a precision of 0.1mm, has the advantages of short detecting period, portable detecting device and reliable detecting result, can achieve efficient and nondestructive detecting for the coating thickness and promote the development of the nonmetal substrate coating thickness detecting technology. Moreover, the invention of the device has low design cost and little art procedure in actual detecting, can reduce the worker's labor intensity and increase detecting safety, and has a good popularization and application value.

The invention provides an aerospace optical fiber cabin-penetrating assembly temperature gradient simulation test device and method, and aims to solve the problem that controllable cabin-penetrating assembly temperature gradient simulation test special equipment cannot be provided in the prior art. The temperature gradient simulation test device is based on a thermal vacuum test system, a simulation cabin plate is installed in a thermal vacuum container, the thermal vacuum container is divided into an in-cabin simulation space and an out-cabin simulation space, and a heating temperature control module arranged in the in-cabin simulation space is used for simulating infrared radiation during sun irradiation to heat a connecting assembly; a vacuum cold background in the space is simulated through the vacuum low-temperature module, and a test interface is arranged in the thermal vacuum container through the component performance test module arranged outside the thermal vacuum container totest the temperature gradient effect of the cabin penetrating component. Simulation of the temperature gradient effect of the cabin penetrating assembly within the wide temperature range is achieved,configuration is flexible, the implementation cost is low, the method is easy to operate and control, and the reliability of the test effect is high.

The invention provides a fatigue driving detection method and system, and relates to the technical field of safe driving, and the method comprises the steps: continuously collecting chest vibration signals of a driver; a heartbeat signal and a breathing signal of the driver are separated from the chest vibration signal; respectively carrying out feature extraction on the heartbeat signal and the respiration signal to obtain a corresponding heartbeat feature value and a corresponding respiration feature value; and inputting the heartbeat characteristic value and the breathing characteristic value into a fatigue driving classification model obtained by pre-training, and processing to obtain a fatigue detection result of the driver. The device has the advantages that thoracic cavity vibration signals are collected in a non-contact mode, body discomfort or secondary injury caused by contact of a driver is avoided, meanwhile, the reliability of a detection result of the thoracic cavity vibration signals is effectively improved due to the fact that the driver does not achieve far-end monitoring, and the reliability of the detection result is improved. Therefore, the detection reliability of the breathing signal and the heartbeat signal is improved, the accuracy of a fatigue detection result is improved, a driver can be early warned in time, and road safety accidents are reduced.

The invention provides a step-down DC (direct current) conversion circuit structure which comprises a BUCK circuit structure, the BUCK circuit structure comprises a first voltage stabilizing capacitor, a second voltage stabilizing capacitor, a first divider resistor and a second divider resistor, wherein the first voltage stabilizing capacitor and the second voltage stabilizing capacitor are arranged in parallel and form an accommodating channel; and the first voltage dividing resistor and the second voltage dividing resistor are arranged in the accommodating channel between the first voltagestabilizing capacitor and the second voltage stabilizing capacitor, so that fingers of an operator cannot touch the first voltage dividing resistor and the second voltage dividing resistor.