Abstract: Provided in the present application are a positioning method and apparatus, and a terminal and a storage medium. On a first terminal side, the positioning method includes: acquiring positioning service information of a target terminal; determining from the target terminal, according to the positioning service information, a primary positioning terminal for providing a primary positioning service and a secondary positioning terminal for providing a secondary positioning service; and performing positioning for a location of a first terminal based on the primary positioning terminal and the secondary positioning terminal. Since the positioning of the first terminal can be assisted by the primary positioning terminal and the secondary positioning terminal, the location of the first terminal can be accurately positioned even if a network coverage area where the first terminal is located does not have a proper positioning server therein to provide a positioning service.

Abstract: The present invention discloses a high-entropy soft magnetic alloy with 900 K high-temperature resistance, comprising Fe, Co, Ni, Si and Al, and the atomic percent of the alloy composition is expressed as FexCoyNizSimAln, wherein x=40%-80%, y=20%-60%, z=0-30%, m=0-20%, n=0-20%, and x+y+z+m+n=100%; the atomic percent of other doping elements is p=0-5%, and 0.5?m/n?3; the performance indexes of the material include: at room temperature, saturation magnetization Ms=90-150 emu/g, and coercive force Hc=0.1-15 Oe; and at 900 K, saturation magnetization Ms=70-130 emu/g, and coercive force Hc=0.1-25 Oe.

Abstract: Disclosed in the present invention is a control method for water supply during loosening and conditioning based on a neural network model and a dual parameter correction. The method comprises: establishing a neural network-based model for predicting the amount of water supplied during loosening and conditioning; predicting and distributing the total water supplied; and correcting the model based on material balance calculation and deviation. In the present application, when there is a large deviation in outlet moisture, the dual correction control system combining the material balance calculation and the moisture deviation is used for correction to improve the stability and precise control of the outlet moisture during the loosening and conditioning process.

Abstract: The disclosure provides a core-shell quantum dots preparing method, core-shell quantum dots and a quantum dot electroluminescent device including the core-shell quantum dots. The method includes preparing a solution containing alloy quantum dot cores, purifying the alloy quantum dot cores; heating a mixture of a cation precursor of the shell, a carboxylic acid, the alloy quantum dot cores and a solvent for a certain period of time, after it, the carboxylic acid presents in the mixture being free carboxylic acid; adding an fatty amine and an anion precursor of the shell into the mixture to coat the alloy quantum dot cores to obtain the core-shell quantum dot. The surface of the core-shell quantum dots includes a fatty amine ligand, which amounts for at least 80% of all the ligands on the surface of the core-shell quantum dots, and the core-shell quantum dots are high in luminescence efficiency and stability.

Abstract: The present invention discloses a drilling system and method of a submarine drilling rig, relating to the technical field of drilling equipment. The system includes a barge, an umbilical cable, a submarine device and a drilling device; where the barge is loaded with a pneumatic-electric-hydraulic control device and a mud treatment device which are respectively connected to the submarine device through the umbilical cable; and the submarine device includes a submarine traveling device, a coiled tubing roller, a derrick, a centralized valve seat, a drill bit replacement device, a wellhead device and a casing rack. The centralized valve seat is connected to the umbilical cable for shunting mud, cement and electrical signals conveyed by the umbilical cable. The derrick is installed above the wellhead device, respectively matched with the drill bit replacement device and the casing rack for replacing drill bits and conveying and withdrawing casings.

Abstract: The present invention provides a preparation method of amorphous GeH, and belongs to the field of preparation technologies of amorphous GeH. The preparation method provided in the present invention includes the following step: sealing crystalline GeH, a pressure calibration object, and a pressure transmitting medium in a cavity of a diamond anvil cell, and adjusting pressure in the cavity to obtain amorphous GeH. In the present invention, pressure is applied to the GeH in the sealed diamond anvil cell, to implement amorphization of the GeH at room temperature. In this way, impurities can hardly be found in the preparation method, and pure amorphous GeH can be obtained. In addition, the method provided in the present invention has simple operations and good repeatability.

Abstract: The present invention discloses a drilling system and method of a submarine drilling rig, relating to the technical field of drilling equipment. The system includes a barge, an umbilical cable, a submarine device and a drilling device; where the barge is loaded with a pneumatic-electric-hydraulic control device and a mud treatment device which are respectively connected to the submarine device through the umbilical cable; and the submarine device includes a submarine traveling device, a coiled tubing roller, a derrick, a centralized valve seat, a drill bit replacement device, a wellhead device and a casing rack. The centralized valve seat is connected to the umbilical cable for shunting mud, cement and electrical signals conveyed by the umbilical cable. The derrick is installed above the wellhead device, respectively matched with the drill bit replacement device and the casing rack for replacing drill bits and conveying and withdrawing casings.