Abstract: The invention belongs to the technical field of packaging interface materials for electronic power devices, and particularly discloses a silver-copper composite conductive paste capable of being sintered at a low temperature, and a preparation method and use thereof. A first purpose of the invention is to provide a silver-copper composite conductive paste capable of being sintered at a low temperature, comprising, by weight, the following components: 20-80% of micro-copper particles; 10-60% of nano-silver sheets; 1-20% of nano-silver particles; and 10% of an organic carrier. The silver-copper composite conductive paste capable of being sintered at a low temperature provided by the invention adopts silver and copper of different sizes and morphologies, large-sized sliver sheets and micro-copper particles are used as skeletons, and small nano-silver particles are used for filling, such that gaps are reduced, and the performance is improved.

Abstract: Provided is a method and an apparatus for evaluating welding arc stability, a device and a medium, and belongs to the technical field of welding. The method includes: determining a plurality of indexes for evaluating arc stability, reference index values of each index and a number of evaluation levels according to sample acoustic emission signals; determining reference membership degrees of different indexes to different evaluation levels according to the reference index values of each index; determining an index value to be measured of each index according to the acquired acoustic emission signals to be measured; determining the membership degree to be measured of each index according to the index value to be measured of each index; and evaluating a level of the arc stability according to the membership degrees to be measured and the reference membership degrees.

Abstract: Disclosed is a hydraulic buffer energy storage device for an over-discharged hoist skip in a vertical shaft. The hydraulic buffer energy storage device for an over-discharged hoist skip in a vertical shaft comprises a vertical shaft, where a hoist skip is hung on an inner side of the vertical shaft, and a hydraulic buffer mechanism is arranged on the inner side of the vertical shaft; the hoist skip is positioned above the hydraulic buffer mechanism; the hydraulic buffer mechanism is communicated with an accumulator group, a pressure relief part and an oil replenishing part through an oil pipeline; the accumulator group is communicated with an energy storage part through an oil pipeline; the energy storage part, the pressure relief part and the oil replenishing part are respectively communicated with an oil tank through oil pipelines, the hydraulic buffer mechanism is connected with a displacement sensor.

Abstract: Disclosed is a hydraulic buffer energy storage device for an over-discharged hoist skip in a vertical shaft. The hydraulic buffer energy storage device for an over-discharged hoist skip in a vertical shaft comprises a vertical shaft, where a hoist skip is hung on an inner side of the vertical shaft, and a hydraulic buffer mechanism is arranged on the inner side of the vertical shaft; the hoist skip is positioned above the hydraulic buffer mechanism; the hydraulic buffer mechanism is communicated with an accumulator group, a pressure relief part and an oil replenishing part through an oil pipeline; the accumulator group is communicated with an energy storage part through an oil pipeline; the energy storage part, the pressure relief part and the oil replenishing part are respectively communicated with an oil tank through oil pipelines, the hydraulic buffer mechanism is connected with a displacement sensor.

Abstract: Disclosed is a marker for observing an effect of a compound or a drug on cells in real time. The marker is: 1) an amino acid sequence shown in SEQ No. 1 and/or SEQ No. 2; or 2) an amino acid sequence having a function for observing an effect of a compound or a drug on cells in real time and having at least more than 80%, preferably more than 85%, more preferably 90%, further preferably 95%, and most preferably 99% homology with the amino acid sequence shown in SEQ No. 1 and/or SEQ No. 2. Also disclosed is a method and a kit for observing an effect of a compound or a drug on cells in real time and use thereof.

Abstract: Disclosed is a method for designing a PID controller, having a control model C ? ( s ) = K P ? ( 1 + K I S ? + K D ? S u ) , wherein KD=aKI, and u=b?, a and b are proportional coefficients, the control model is reset as C ? ( s ) = K P ? ( 1 + K I S ? + aK I ? S b ? ? ? ) , a transfer function of a controlled object in a control system is set as G ? ( s ) = K s 3 + ? 1 ? s 2 + ? 2 ? s .

Abstract: Disclosed is a marker for observing an effect of a compound or a drug on cells in real time. The marker is: 1) an amino acid sequence shown in SEQ No. 1 and/or SEQ No. 2; or 2) an amino acid sequence having a function for observing an effect of a compound or a drug on cells in real time and having at least more than 80%, preferably more than 85%, more preferably 90%, further preferably 95%, and most preferably 99% homology with the amino acid sequence shown in SEQ No. 1 and/or SEQ No. 2.