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124 results about "Classification structure" patented technology

The job classification structure is the system for how jobs at the university are related based on the type of work and level of work performed in the job. The structure is a tool for staff to understand how these jobs are grouped together and to explore the many ways to plot out a career path,...

Low-pollution combustion chamber with main combustion stage adopting single-layer pre-film radial two-grade reverse rotational flow

The invention discloses a low-pollution combustion chamber with a main combustion stage adopting single-layer pre-film radial two-grade reverse rotational flow. The low-pollution combustion chamber adopts a single annular cavity structure, and comprises a diffuser, a combustion outdoor box, a combustion indoor box, a flame cylinder outer wall, a flame cylinder inner wall and a combustion chamber head part; the combustion chamber adopts a classification combustion scheme; the combustion head part is divided into a pre-combustion stage and the main combustion stage; the pre-combustion stage adopts a mode of combining rotational flow-stable diffusion combustion with rotational flow premixing combustion; the combustion mode reduces the pollutant discharge under small working conditions when not influencing stable combustion; and the main combustion stage adopts a premixing pre-evaporation combustion mode to be in favor of uniform combustion. The combustion chamber adopts a center classification structure; the pre-combustion stage is simple in structure; the main combustion grade adopts a two-grade reverse cyclone distributed in the radial direction; and two parts of reverse rotational flows shear an oil film, so that the atomization effect is greatly improved, the atomization of fuel of the main combustion stage and the mixing with air are enhanced, the premixing pre-evaporation of the fuel is reinforced, and the pollution discharge of whole landing and taking-off circulation of an aero-engine combustion chamber is further reduced.
Owner:BEIHANG UNIV

Line fault judgment method based on wavelet analysis and support vector machine

The invention belongs to the technical field of power system line fault judgment, and particularly relates to a line fault judgment method based on wavelet analysis and a support vector machine. The method comprises steps: firstly, fault current signals in a wave recording system are extracted, and the wavelet analysis technology is adopted for extracting and analyzing feature information of the fault current signals; then, a wavelet energy entropy theory is used for decomposing the fault current signals, an energy entropy value corresponding to each phase of current is calculated, and zero-sequence current is combined for building a four-dimensional feature vector for transmission line fault classification; and finally, a two-layer classification model is used for specific fault judgment. The judgment method comprises a linear classification module and a nonlinear classification module, wherein linear classification is initial classification on data samples according to the two-layer classification structure of the zero-sequence current and threshold parameters; and on the basis, according to data features for transmission line small sample fault, the support vector machine is used for nonlinear classification on multiple kinds of fault data, and transmission line fault judgment is finally realized.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)

Method for constructing tree structural directory in database

The invention discloses a method for constructing a tree structural directory in a database, which relates to the method for constructing the tree structural directory in the database. The method comprises the following steps of: establishing a commonly used directory structure module used for describing a tree structure and a commonly used configuration module used for describing the information related to nodes in the tree structure in the database; and when establishing the tree structure, storing the information related to the tree structure to be established into the directory structure module and the configuration module first and then establishing a specific information-containing tree structural directory by combining the information stored in the directory structure module and the configuration module. By using the method for establishing the tree structural directory of the database, a large amount of redundant data in data storage space is reduced so that various information tables can adapt to various classification structures conveniently. Therefore, the utilization rate of the storage space such as a hard disk and / or a buffer memory and the like is improved extremely, the system development and maintenance workload is obviously reduced and the stability of the system is enhanced.
Owner:SICHUAN CHANGHONG ELECTRIC CO LTD

Preparation method of bionic oil-water separation copper net

The invention relates to a preparation method of a bionic oil-water separation copper net; and the preparation method is enlightened by hydrophobic self-cleanness of natural plant leaf surfaces, and an electrochemical deposition method is adopted to prepare super-hydrophobic surfaces with bionic micro-nanoscale double-layer classification. The method comprises the following steps: firstly, diluted hydrochloric acid, acetone and distilled water are used to clean the copper net for pretreatment; then, the copper net is dipped in electroplating liquid for electrochemical deposition, so that the surface morphology features are changed, and a bionic micro-nanoscale double-layer classification structure is formed on the surface of the copper net; after the electric deposition is finished, the copper net with the bionic micro-nanoscale double-layer classification structure is dipped into modifying solution, so that the surface thereof is formed with a low-surface-energy film; and finally, the surface of the copper net has super-hydrophobic and super-oleophylic characteristics. The preparation method of the bionic oil-water separation copper net is simple in operation, controllable in experimental parameters and low in cost, and can be used for manufacturing oil-water separation materials; and the materials have the super-hydrophobic and super-oleophylic characteristics, excellent mechanical stability and the recycling property.
Owner:JILIN UNIV
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