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242results about How to "Avoid easy installation" patented technology

Device and method for simultaneously measuring Hall coefficient and seebeck coefficient

The invention belongs to the technical field of semiconductor material test, and particularly relates to a device and a method for simultaneously measuring a Hall coefficient and a seebeck coefficient. The device comprises a straight running slide rail, a magnet group, a test probe and a main heater. Magnet racks are respectively arranged on two ends of the straight running slide rail. A pair of same magnet groups are arranged on each magnet rack. The main heater is arranged on the straight running slide rail. To-be-tested samples are arranged on two sheets of ceramic sheet auxiliary heaters on the surface of the main heater. Test probes are arranged on the main heater. A motor drives the straight running slide rail to move. The invention also discloses the method for simultaneously measuring a Hall coefficient and a seebeck coefficient by use of the device. According to the invention, a problem of high requirements on shape measurement in measurement of the seebeck coefficient is effectively solved; different sizes and shapes of materials can be measured; measurement of the Hall coefficient and the seebeck coefficient at different temperatures is achieved; automatic operation is achieved; and test precision is high.
Owner:HUAZHONG UNIV OF SCI & TECH

Omnidirectional cataclastic rock mass deep hole installation and recovery device of microseismic unidirectional sensor

InactiveCN102854525ASolve hard-to-couple problemsAvoid easy installationSeismic signal receiversBody femaleDeep hole
The invention discloses an omnidirectional cataclastic rock mass deep hole installation and recovery device of a microseismic unidirectional sensor. The omnidirectional cataclastic rock mass deep hole installation and recovery device comprises a sleeve which is embedded in a rock mass drilling hole, wherein a unidirectional sensor fixing device is installed at each part with a preset depth and direction in the sleeve and comprises an intermediate joint which is connected with the sleeve by inner threads, a wedge body combining body which is connected with the intermediate joint and is provided with a wedge body combining body female groove, a wedge body which is adapted to the wedge body combining body female groove, another unidirectional sensor which is connected with the wedge body, a tensile-resisting cable which is connected with the another unidirectional sensor, an elastic pressing device which is fixed on the wedge body combining body, and a pulling type lifting device which is connected with a second leading-out terminal of a cylindrical helical torsional spring of the elastic pressing device and is used for releasing the wedge body, wherein one end of the elastic pressing device tightly presses the wedge body in the wedge body combining body female groove. With the adoption of the omnidirectional cataclastic rock mass deep hole installation and recovery device, the installation is not limited by severe geological conditions and drilling inclined angles, the installation of a vertical hole and an inclined hole in a cataclastic rock mass can be realized, and the unidirectional sensors are easy to recover.
Owner:INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI +1

Urban underground comprehensive steel pipe gallery

The invention discloses an urban underground comprehensive steel pipe gallery which comprises box type pipe joints, wherein each box type pipe joint is formed by assembling unit plate sheets, and the box type pipe joints are assembled in the axial direction to form a box type pipe gallery; protrusions are arranged on the outer side and/or the inner side of each unit plate sheet, and openings are formed in the periphery of the cross section of each protrusion. Compared with a circular-section pipe gallery, the box type pipe gallery structure of the urban underground comprehensive steel pipe gallery increases the use ratio and the general net width and net height of the internal clearance, the height of the pipe gallery is significantly reduced under the condition of ensuring the same internal clearance space, and therefore the foundation excavation depth is decreased, and the civil engineering quantity is reduced; the bottom straight surface of the pipe gallery can be directly used as a pedestrian passage or a driving passage, so that the most important and the most difficult re-filling and the degree of compaction of a bottom wedge-shaped included angle when the circular-section pipe gallery is re-filled are achieved; the pipe gallery is in a semi-flexible structure, has a good anti-seismic property and good settlement resistant performance, can absorb the trace deformation, and is not easily crazed.
Owner:NANJING LIANZHONG CONSTR ENG TECH
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