拖布支架

Wireless upgrading method and device for access control card reader

The invention discloses a wireless upgrading method and device for an access control card reader. The method comprises the following steps: establishing wireless connection with a handheld terminal; sending version information to the handheld terminal to obtain pre-upgrading information fed back by the handheld terminal; determining a to-be-upgraded directory according to the pre-upgrading information, and switching to a program upgrading mode after the to-be-upgraded directory is sent to the handheld terminal; then, sending an initialization instruction to the handheld terminal to obtain initialization information fed back by the handheld terminal; after an upgrading instruction sent by the handheld terminal is obtained, firmware upgrading is carried out according to the initialization information and upgrading data sent by the handheld terminal; according to the access control card reader, the firmware of the access control card reader can be wirelessly upgraded through the handheld terminal ...

Equipment fault propagation analysis method and system based on unstable point detection

The invention discloses an equipment fault propagation analysis method and system based on unstable point detection. The equipment fault propagation analysis method based on unstable point detection comprises the following steps: constructing a fault propagation graph according to a fault propagation relationship between industrial complex systems; detecting unstable points by using a BRISM method under different rules, performing importance evaluation on an original fault propagation graph by using a PageRank method, and updating the weight of the unstable points; and calculating the weight of the edge in the layering result, and identifying a key fault propagation path between different systems according to the weight of the edge. According to the method, the influence of unstable points on the key propagation path is effectively reduced, the accuracy of fault propagation path identification is further improved, and finally the fault propagation paths of different fault components are ...

CANFD bus-based access control management method and system

The invention discloses an access control management method and system based on a CANFD bus, the method and system are used for access control devices arranged in different areas in the access control management system, and the method comprises the following steps: obtaining a historical passing record of a person requesting to pass; judging whether the request passing data is legal or not according to the preset permission data and the historical passing record; wherein the preset permission data comprises personnel permission data, area data, a passing level and a management category; when it is judged that the passing request data are legal, a gate opening signal is output, passing data are obtained, a passing record is generated according to the passing data, and the passing record is distributed to access control devices in other areas through a CANFD bus; by implementing the access control system and the access control method, legality judgment of the request passing data can be locally ...

HEAT DISSIPATION DEVICE EMPLOYING CIRCULATING COOLING LIQUID, HEAT DISSIPATION SYSTEM EMPLOYING CIRCULATING COOLING LIQUID, AND OPTICAL PROJECTION SYSTEM

A heat dissipation device (10) employing a circulating cooling liquid comprises: a container (1) having an accommodation space (11); a cooling-liquid circulation tube (20) in communication with the container (1), a liquid discharged from the cooling-liquid circulation tube (20) being received in the accommodation space; an input opening arranged at an outer wall of the container (1) to input the liquid discharged from the cooling-liquid circulation tube (20) to the accommodation space (11); an output opening (3) arranged at the outer wall of the container (1) to output the liquid to the cooling-liquid circulation tube (20); and an output duct (4) having a liquid inlet (41) positioned always under the liquid level, the output duct (4) being connected to the output opening (3), and the liquid entering the output duct (4) from the liquid inlet (41) and being outputted to the cooling-liquid circulation tube (20). Also provided are a heat dissipation system (100) employing a circulating cooling ...

Probabilistic grey number fuzzy Petri net-based working condition deterioration tracing method in froth flotation process

The invention discloses a froth flotation process working condition deterioration tracing method based on a probabilistic grey number fuzzy Petri net. The method comprises the steps that production rules are established for knowledge variables of froth flotation to describe the causal logic relation between the knowledge variables; the regular probability is converted into a probability grey number fuzzy Petri network (PGFPN) model after being subjected to grey processing; and obtaining a state value and an event occurrence possibility of the obtained knowledge node in combination with an actual production process, thereby initializing a variable value and establishing an incidence matrix for parallel reasoning, and finally obtaining a root of working condition deterioration in the flotation process. According to the invention, subjectivity and complexity of a decision-making environment are overcome. According to the PGFPN knowledge representation model, the causal relationship between ...

Testing device and method for observing migration rule of discrete material under hydraulic action

The invention provides a test device and method for observing the migration rule of a discrete material under the hydraulic action. The side wall of a rainfall cylinder is provided with a water inlet and a plurality of overflow ports which are arranged at intervals in the vertical direction; the multiple test bins are sequentially connected in the vertical direction, the test bin located on the uppermost layer is connected with the lower portion of the rainfall cylinder, a vertically-through cavity is formed in each test bin, a filter screen is arranged at the bottom of each test bin, and the test bins are made of transparent materials; the water outlet cylinder is arranged below the test bin on the lowermost layer and is communicated with the test bin, and a peristaltic pump is externally connected to a water outlet of the water outlet cylinder; channels of the resistance strain test system are respectively connected with the plurality of test bins, and a plurality of pore water pressure ...

Wheat batch cultivation device and management method

The wheat batch cultivation device comprises a supporting frame, cultivation modules and cultivation modules, the supporting frame is of a rectangular frame structure, the cultivation modules are evenly installed in the supporting frame, and the cultivation modules are installed at the upper ends of the cultivation modules. The size of the discharging grooves between the adjacent connecting plates can be adjusted, the cultivation requirements of different planting seals can be met, the consistency of wheat cultivation can be accurately managed, the subsequent wheat planting density can be accurately selected, meanwhile, single ridges or double ridges can be accurately controlled to be formed during sowing during planting, and the planting efficiency is improved. Furthermore, the spacing during wheat planting can be adjusted.

Flotation process froth image feature selection method and device based on sensitive mutual information

The invention provides a flotation process froth image feature selection method based on sensitive mutual information. The flotation process froth image feature selection method comprises the steps that obtained froth flotation image feature data are preprocessed, abnormal data are removed, and normalization processing is carried out; calculating a sensitive coefficient of the image features and the concentrate grade by adopting a Pearson's correlation coefficient, and constructing an optimization objective function selected by the sensitive features of the foam image based on an mRMR criterion; and optimizing feature selection by adopting the particle swarm algorithm based on multi-population collaborative search. According to the method, a selection objective function of sensitive foam image features can be constructed according to existing data, feature selection is optimized by adopting a multi-population collaborative search particle swarm optimization algorithm, selection of numerous ...