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47 results about "Sensu stricto" patented technology

Raman scattering method for measuring GaN thermal expansion coefficient

A Raman scattering method for measuring a GaN thermal expansion coefficient includes the following steps that 1, a sample is scribed, sampled and cleaned; 2, variable-temperature Raman testing is performed on the sample; 3, linear fitting is performed on a testing result, and the linear fitting slope and intercept are extracted. According to the extracting result, the thermal expansion behavior of a solid material is tested and represented in combination with the physical meaning of Gruneisen parameters. The variable-temperature Raman scattering technology is adopted, Raman scattering is utilized for obtaining the relation between Raman phonon frequency shift and temperature, nondestructive testing and representing can be accurately performed on thermal expansion behaviors of epitaxial layer film two-element and multi-element alloy systems of GaN, AlN, InN and other III group nitrides, and therefore it is avoided that in a common representation method, the sample is damaged, and formula derivation and mathematical calculation are complex; because no strict requirements for the shape and size of the sample exist, the thermal expansion behaviors of all kinds of semiconductor materials can be conveniently tested, and the method is simple, easy to implement and small in error.
Owner:XI'AN PETROLEUM UNIVERSITY

All-fiber active Q-switched laser based on saturable absorption optical fiber

The invention discloses an all-fiber active Q-switched laser based on a saturable absorption optical fiber. The all-fiber active Q-switched laser based on the saturable absorption optical fiber comprises a fiber laser unit and an active Q-switched unit (20), wherein the active Q-switched unit (20) comprises the saturable absorption optical fiber (5), a saturable absorption optical fiber pumping wavelength division multiplexer (6), a saturable absorption optical fiber pumping source (8) and a function generator (9). The saturable absorption optical fiber (5) and the saturable absorption optical fiber pumping wavelength division multiplexer (6) are connected into an optical fiber link of the fiber laser unit in series. The function generator (9) is used for conducting electric pulse modulation on the saturable absorption optical fiber pumping source (8). According to the all-fiber active Q-switched laser based on the saturable absorption optical fiber, traditional saturable absorption passive Q-switching is converted to active Q-switching, continuous adjustment of the parameters such as the pulse width and the repetition frequency of the pumping source is achieved through the externally arranged function generator, and then the proper all-fiber structure is obtained. The all-fiber active Q-switched laser based on the saturable absorption optical fiber has the advantages of being reliable in performance, stable in output parameter, resistant to vibration, high in environmental adaptation and the like.
Owner:NORTHWEST INST OF NUCLEAR TECH

Watershed ecological drought evaluation and prediction method

ActiveCN107944636AOvercoming the inability to accurately assess the ecological impact of droughtExpand the scope of assessmentForecastingGeographical information databasesDrainage basinStreamflow
The invention discloses a watershed ecological drought evaluation and prediction method. Currently, ecological drought is not strictly defined, and a drought index framework which is generally applicable and takes ecological health of rivers is not formed yet. A monthly flow process simulated by a vertical mixed production flow model of a watershed grid unit, a P-III distribution function is adopted for fitting theoretical probability distribution, and the skewed distribution is converted into standard normal distribution to obtain ecological drought index value of the watershed. The ecological water demand quantity of a river channel is calculated according to the Tennant method, the ecological runoff quantity values required by different levels are standardized, and the drought level dividing standard of the ecological drought indexes of the watershed is determined. The evaluation range of the current drought index is expanded, and an ecological technical support can be provided forcomprehensive building of a watershed drought early-warning and monitoring system and watershed health. Forecast and prediction can be carried out on further changes of the ecological drought by combining the meteorological and hydrological information.
Owner:HOHAI UNIV

Drainage basin scale sudden drought accurate identification method

The invention discloses a drainage basin scale sudden drought accurate identification method, and belongs to the technical field of drought forecasting and early warning. The drainage basin scale sudden drought accurate identification method comprises the following steps: firstly, constructing a basin VIC land surface hydrological model based on hydrometeorological observation data and geographicspace data, and obtaining a soil water content process simulated by the model through hydrological process verification; secondly, based on the highest air temperature and the soil water content, scientifically defining an accurate sudden drought identification index by adopting a strength change rate (a rapid degree index) and a short-time scale scheme; and finally, by constructing a single-sitesudden drought magnitude index and a unit time sudden drought severity and coverage area index, determining a grading standard of the basin sudden drought event. At present, there is no strict definition related to sudden drought events, and there is no sudden drought accurate identification index system. The drainage basin scale sudden drought accurate identification method can achieve the precise recognition of the sudden drought event, and provides a scientific reference basis for the improvement of the monitoring capability of the sudden drought event of the drainage basin, the avoidance of the sudden drought risk, and the guaranteeing of the grain safety.
Owner:HUAIYIN TEACHERS COLLEGE

Magnetic suspension door

The invention discloses a magnetic suspension door, and relates to the technical field of magnetic suspension. The magnetic suspension door comprises a magnetic suspension rail and a movable door under the magnetic suspension rail; the magnetic suspension rail comprises a rail beam, a suspension slider and permanent magnets; a fixed rail is fixed on the lower surface of the rail beam; the permanent magnets comprise a fixed permanent magnet array and a suspension permanent magnet array; the fixed permanent magnet array is arranged on the bottom of the fixed rail and the suspension permanent magnet array is arranged in the suspension slider to achieve homopolar repulsion between the suspension permanent magnet array and the fixed permanent magnet array; the suspension slider is suspended below the fixed rail through the repulsive action of the suspension permanent magnet array and the fixed permanent magnet array; the movable door is fixed at the lower end of the suspension slider; and the magnetic suspension door further comprises a driving device. The magnetic suspension door does not need to be provided with a rail on the ground, does not need to be opened or closed manually, doesnot have mechanical friction between the rail and a door body, and is a proper magnetic suspension door.
Owner:长春市苏伟磁悬浮技术研究所
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