Abstract: An antenna switching method and a terminal antenna are disclosed, and relate to the field of antenna technologies. A specific solution involves: receiving, by the electronic device, a target signal with a target polarization characteristic, controlling the terminal antenna to operate in a first state when an attitude of the electronic device is the first attitude, where the terminal antenna in the first state has a first polarization characteristic, and the first polarization characteristic corresponds to a target polarization characteristic of a target signal received in the first attitude; and controlling the terminal antenna to operate in a second state when the attitude of the electronic device is the second attitude, where the terminal antenna in the second state has a second polarization characteristic, and the second polarization characteristic corresponds to a target polarization characteristic of a target signal received in the second attitude.

Abstract: Disclosed are a method and apparatus for compressing a topology recognition model, an electronic device, and a medium. The method includes: pruning a to-be-compressed model to obtain a pruned model, and training the pruned model to obtain a trained pruned model; quantifying a bit quantity of a weight parameter of each neural network layer in the trained pruned model from a first bit quantity to a second bit quantity to obtain a highly-quantified pruned model, and training the highly-quantified pruned model to obtain a trained highly-quantified pruned model; using the trained highly-quantified pruned model as the to-be-compressed model, continuously pruning and quantifying the to-be-compressed model until a compressed topology recognition model is obtained, and deploying the compressed topology recognition model on an Internet of Things in Power Systems (IOTIPS) terminal, to reduce a size of the topology recognition model while ensuring the topology recognition model meets an accuracy requirement.

Abstract: A device and a method for transferring and storing a deep in-situ core in a sealed and pressure-maintaining manner includes a pressure vessel, a sealed storage vessel, a control system, a pressure regulation system and at least one spherical valve. The pressure vessel includes a first barrel and a first end sealing piston mounted at a first end of the first barrel and being slidable in the pressure vessel. The sealed storage vessel includes a second barrel and a second end sealing piston which is mounted at a first end of the second barrel. At least one spherical valve is connected between the first barrel and the second barrel. The pressure regulation system is configured for regulating an amount of water in the second barrel. The control system includes a first pressure sensor, a second pressure sensor, and a controller.

Abstract: A device and a method for transferring and storing a deep in-situ core in a sealed and pressure-maintaining manner includes a pressure vessel, a sealed storage vessel, a control system, a pressure regulation system and at least one spherical valve. The pressure vessel includes a first barrel and a first end sealing piston mounted at a first end of the first barrel and being slidable in the pressure vessel. The sealed storage vessel includes a second barrel and a second end sealing piston which is mounted at a first end of the second barrel. At least one spherical valve is connected between the first barrel and the second barrel. The pressure regulation system is configured for regulating an amount of water in the second barrel. The control system includes a first pressure sensor, a second pressure sensor, and a controller.

Abstract: The present disclosure provides a device and a method for preparing natural gas hydrate under controlled temperature and pressure, which relates to the technical field of rock and soil mechanics test technology and equipment. The device includes a three-axis cylinder outer tube, a temperature adjustment system, a pressure loading system, a gas supply system and a recovery system. The three-axis cylinder outer tube is provided with an accommodating cavity throughout its middle, and the accommodating cavity is provided with an end cover of the three-axis cylinder outer tube at each end thereof. The temperature adjustment system is used to adjust the temperature of the three-axis cylinder outer tube. The pressure loading system is used to apply pressure load to the accommodating cavity. The gas supply system is used to supply a high-pressure gas into the accommodating cavity. The recovery system is used to recover the moisture and gas in the accommodating cavity.