Abstract: Disclosed is a switching power supply circuit and a control circuit and a control method thereof. The control circuit comprises a control unit and a driving unit. The control unit controls the driving unit to provide a driving signal with different driving strengths according to a comparison result between a switching voltage and a preset voltage, so as to adjust a speed of turning the power switch off. By controlling the driving strength of the driving signal, a rising rate of the switching voltage can be improved, a spike of the switching voltage can be reduced, various components in the circuit can be protected from being damaged by the spike, and service life and reliability of the circuit can be improved.

Abstract: A calculation system for predicting a proppant embedding depth based on a shale softening effect is provided, including a sampling test terminal, a scheduling module, a monitoring module, and a calculation module, wherein the scheduling module, the monitoring module, and the calculation module are connected in communication, and the monitoring module is connected to an external operating system through a wireless network, wherein the external operating system is configured to perform a hydraulic fracturing operation and receive a first control signal and/or a second control signal from the monitoring module. The sampling test terminal is configured to test the samples and obtain test data. The scheduling module is configured to determine a target construction parameter.

Abstract: A method and device for controlling viscosity of asphalt rubber based on a current variation are provided. The method includes processing asphalt rubber raw materials with a first preset proportion, and shearing the processed asphalt rubber; obtaining a shearing current, pumping and discharging the sheared asphalt rubber; obtaining a discharging current, and obtaining the viscosity of the pumped asphalt rubber according to the discharging current and the viscosity-discharging current correlation relationship. The method includes comparing the viscosity with a preset viscosity; outputting the pumped asphalt rubber as finished asphalt rubber when the viscosity is equal to the preset viscosity. The method includes adjusting the viscosity according to the discharging current. Double-current control is adopted, so that the whole-process control of the processing viscosity of the asphalt rubber is realized, and the control accuracy of the viscosity is improved.

Abstract: The present invention relates to a three-dimensional acid fracturing method for carbonate reservoirs in long intervals, which sequentially comprises the following steps: S1: based on the distribution characteristics of porosity and permeability of the reservoir where the candidate well is located, the reservoirs are divided into Class I, Class II and Class III, and the required acid fracturing fracture density range ?ir of different types of reservoirs is determined according to the increase of production; S2: Determine the most economical fracture number Ne when the economic net present value NPV of candidate wells reaches the maximum in the fifth year based on interval length of different types of reservoirs in candidate wells and acid fracturing fracture density range ?ir determined by S1; S3: Determine the three-dimensional acid fracturing segmented fracture arrangement technology according to the completion mode of the candidate well and the most economical fracture number Ne determined by S2; S4: Based

Abstract: Aspects of the subject disclosure may include, for example, identifying a number of radio resources of a mobile device, detecting activity of an application, and determining a data communication requirement of the application. The data communication requirement is compared to a first component carrier capacity and responsive to it exceeding the first component carrier capacity, a number of secondary component carriers providing secondary capacities are identified according to the data communication requirement, wherein a combination of the first capacity and the number of secondary capacities is not less than the data communication requirement. A group of the radio resources is configured according to the number of secondary component carriers, wherein a number of the group of the radio resources does not exceed the maximum number of the radio resources, and wherein the data communication requirement is accommodated by the combination of the first and secondary capacities. Other embodiments are disclosed.

Abstract: A structural stabilizer for a fiber and proppant complex to enhance proppant migration and placement in a fractured well during propping and a preparation method thereof are provided. The structural stabilizer consists of: water, inorganic salt, kaolinite, nitrogen-doped modified graphene oxide, anionic surfactant, non-ionic alkyl polyglucoside, and polyacrylamide. The structural stabilizer improves bonding between a proppant and a fiber when slick water is used in stimulated reservoir volume (SRV) fracturing, prevents separation of the fiber and the proppant during migration, thereby reducing escape rate of the fiber from the fiber and proppant complex.

Abstract: The present invention provides a pharmaceutical composition for treating myocardial ischemia, comprising Salvia Miltiorrhiza medicinal material 250-700 parts by weight, Radix Notoginseng medicinal material 50-150 parts by weight, Borneolum Syntheticum 3-9 parts by weight, and ranolazine 25-100 parts by weight. According to a further aspect of the present invention, there is provided a use of a pharmaceutical composition for preparation of a medicine for prevention and/or treatment of myocardial ischemia.

Abstract: A method, system, computer readable storage medium, or apparatus provides for receiving a first message from a user equipment (UE), wherein the first message comprises an indication of one or more conditions, wherein the one or more conditions comprises an indication that the UE has a radio mode that comprises new radio (NR); determining a required idle period for long term evolution (LTE) for the UE; determining, based on the first message and the required idle period for LTE, a transmission time interval (TTI) for NR that corresponds to the required idle period for LTE; and sending, to the UE, a second message, wherein the second message comprises an indication of the TTI for NR.

Abstract: A soluble metal sealing ring with a controllable dissolution rate and preparation process thereof include an aluminum alloy sealing ring matrix and a composite coating coated on an outer surface of the aluminum alloy sealing ring matrix whose standard electrode potential is greater than ?0.3 volts (V). The preparation process includes: (1) preparing a high-plastic aluminum alloy; (2) preparing the aluminum alloy sealing ring matrix by machining; (3) annealing the aluminum alloy sealing ring matrix; (4) mixing raw materials of the composite coating evenly; (5) preparing the composite coating on an outer surface of the aluminum alloy sealing ring matrix; (6) preparing holes. The soluble metal sealing ring solves problem that good sealing performance and good dissolving performance are difficult to obtain simultaneously in the existing product, and has advantages of good sealing performance, controllable dissolving rate, no blockage and others.

Abstract: The invention relates to the technical field of in-situ development of shale oil resources and consists of a device and technique for simulating the propagation of shale fractures under the influence of high-temperature convective heat. The apparatus is comprised of a data collecting and processing system, a high-temperature thermal fluid generator, a high-pressure pumping device, and a shale reactor. The thermal fluid generator for high temperatures consists of a fluid generator, a temperature controller, and a pressure controller. The shale, reaction kettle consists of an outer chamber, an outer chamber lid, a scaled rock cavity, and a shale sample. The outer cavity cover of the reactor is fitted with a simulated wellbore, the bottom end of the simulated wellbore penetrates the inner cavity cover and extends to the interior of the shale sample, and the top of the simulated wellbore is connected to a high-pressure constant-speed injection pump.

Abstract: The invention proposes a method of separating hemicellulose through efficient pretreatment of fibrous biomass materials. Fibrous biomass materials are first pretreated by the slurry method: the fibrous biomass materials are milled through ball mills and sieved to obtain fibrous biomass material powder, and the powder is mixed with water at room temperature to obtain slurry premixed solution of the fibrous biomass material powder. Through regulation and control of the reaction temperature, the time and the water amount, efficient hydrothermal removal of hemicellulose from the fibrous biomass material powder is realized. After the mixed solution is filtered, the filtrate is subject to gradient sedimentation to separate hemicellulose with low dispersity, and the sediment is then dried before storage. After the filter residue is mixed with polar aprotic solvent and water, and heated and stirred in a pressurized reactor, high-purity cellulose is obtained through filtering and separation.

Abstract: The present disclosure relates to a calculation method for predicting a proppant embedding depth based on a shale softening effect, including determining a spontaneous imbibition depth-soaking time curve; determining a Young’s modulus-soaking time curve of core surfaces; establishing a proppant embedding model containing a softened layer by a finite element method; conducting a numerical simulation to obtain an embedding volume-soaking time curve; and obtaining a calculation formula for a proppant embedding volume considering a softening effect.

Abstract: Aspects of the subject disclosure may include, for example, determining a Reference Signal Received Power (RSRP) and a Signal to Noise Ratio (SNR) for a plurality of carriers at a user equipment (UE) device, the plurality of carriers transmitted by a source group of cells including a source primary cell (PCell) and one or more source secondary cells (SCells) associated with the source PCell, and initiating a handover of communication with the UE device from the source group of cells to a target group of cells, wherein the target group of cells includes a target PCell and one or more target SCells, wherein the initiating the handover is responsive to the RSRP exceeding a predetermined RSRP threshold and the SNR exceeding a predetermined SNR threshold. Other embodiments are disclosed.

Abstract: A popcorn extruder includes a feeder, a popping chamber, a heating device, an unloading device, and a discharge tube. The chamber is a vertical cylindrical barrel. Said heating device and said unloading device are installed on top of the barrel and at the bottom of the barrel, respectively. Said feeder has a discharge end connected with the upper-end side wall of the chamber. Said discharge tube has one end installed at the upper-end side wall of the chamber. Said unloading device has a conical structure. Said conical structure is located in the chamber, and said conical structure has the tapered end facing up. Said heating device includes a fan, an air duct and a heater installed in the air duct; said fan is connected with one end of the air duct; and said air duct has the other end inserted in the chamber and is adjacent to the conical structure.

Abstract: Aspects of the subject disclosure may include, for example, receiving a data packet for transmission over a wireless network to a user equipment (UE) device in data communication with one or more network elements over one or more carrier legs of the wireless network, receiving information about current network conditions, retrieving a set of packet splitting rules which define initial boundary conditions for a process of splitting packets into smaller data packets for transmission to the UE device, applying, in a machine learning model, one or more packet splitting rules of the set of packet splitting rules to split the data packet into a set of smaller data packets, based on the information about current network conditions in the wireless network, selecting, in the machine learning model, a flow control arrangement for the data packet, including determining a number of smaller packets to split the data packet, and selecting respective carrier legs of the one or more carrier legs of the wireless network for c

Abstract: The spectrum sharing dynamic mode switch in TDMA may allow for the transmission of only one radio mode per transmission time interval (TTI). Such system may address radio interference or retransmission (reTX) failures, among other things.

Abstract: Techniques for improved wireless throughput via beam reflection reduction are provided. A wireless communication device can include a device enclosure that at least partially encompasses an interior of the wireless communication device, the device enclosure comprising a cover assembly that defines a surface of the wireless communication device, wherein the cover assembly is composed of at least a first material; an antenna embedded within the interior of the wireless communication device substantially adjacent to the cover assembly, wherein the antenna is situated at a position relative to the cover assembly; and an aperture formed into the cover assembly at the position, wherein the aperture is not composed of the first material. Alternatively, the aperture can be coated with a non-reflective material that is distinct from the first material.

Abstract: A soluble metal sealing ring with a controllable dissolution rate and preparation process thereof include an aluminum alloy sealing ring matrix and a composite coating coated on an outer surface of the aluminum alloy sealing ring matrix whose standard electrode potential is greater than -0.3 volts (V). The preparation process includes: (1) preparing a high-plastic aluminum alloy; (2) preparing the aluminum alloy sealing ring matrix by machining; (3) annealing the aluminum alloy sealing ring matrix; (4) mixing raw materials of the composite coating evenly; (5) preparing the composite coating on an outer surface of the aluminum alloy sealing ring matrix; (6) preparing holes. The soluble metal sealing ring solves problem that good sealing performance and good dissolving performance are difficult to obtain simultaneously in the existing product, and has advantages of good sealing performance, controllable dissolving rate, no blockage and others.

Abstract: Disclosed is a slicing and collecting device for processing frozen meat sheets, including a frame, and a slicing mechanism is arranged above the frame; a sliding plate is arranged on one side of the slicing mechanism, and a bagging mechanism is arranged on one side of the sliding plate far away from the slicing mechanism; a blocking structure is arranged between the sliding plate and the bagging mechanism, a loading mechanism is arranged on the other side of the slicing mechanism, a storage mechanism is arranged on one side of the loading mechanism far away from the slicing mechanism, and a bottom of the loading mechanism is communicated with the storage mechanism.