Abstract: A power tool includes a main body and a battery pack. The main body includes a housing and a motor, a switch assembly, and an electronic control device. The electronic control device is electrically connected to the switch assembly and the motor. The electronic control device includes an electronic control assembly, a mounting base, and a connecting assembly. The electronic control assembly includes a power circuit board. The power circuit board is provided with an opening. The connecting assembly conductively connects the battery pack to the electronic control assembly, connects to the mounting base via the opening, and mates with the mounting base to form a mounting space in which the electronic control assembly is mounted.

Abstract: A LED lighting device, comprising: a base which has a bottom plate and a side wall, a cavity being formed between the bottom plate and the side wall; an optical component which covers one side of the base in a light-emitting direction of the LED lighting device; and a light source which is provided in the cavity of the base and comprises a circuit board and several LED arrays, the LED arrays comprising LED lamp beads fixed on the circuit board. The optical component comprises an optical unit, and the optical unit comprises a plurality of first optical components and a plurality of second optical components which correspond to the first optical components.

Abstract: This disclosure generally relates to power generation methods and systems based on gas turbine engines, and particularly to mobile and adaptive power generation systems and methods based on gas turbine engine for supplying mechanical and/or electrical power for fracturing operations at an oil wellsite. Various systems, platforms, components, devices, and methods are provided for flexibly and adaptively configure one of more gas turbines, hydraulic pumps, and electric generators to support both fracturing and electric demands at a well site. The disclosed implementations enable and facilitate a mobile, adaptive, and reconfigurable power system to provide both mechanical and electric power for hydraulic fracturing operation.

Abstract: Disclosed is a method for improving sensitivity of vacuum testing of a vacuum switch, including the following steps: S100: smearing a water-soluble metal nanoparticle reagent evenly on a surface of a target material of a to-be-tested vacuum switch, performing standing and forming a metal nanoparticle coating on the surface of the target material; S200: bombarding, by using laser pulse, the surface of the target material where the metal nanoparticle coating is formed, so as to generate plasma on the surface of the target material; S300: obtaining a plasma image by collecting the plasma, and obtaining a plasma spectrum by performing spectroscopic analysis on the plasma image; and S400: obtaining a vacuum degree of the to-be-tested vacuum switch based on the plasma spectrum. The present disclosure can effectively improve a laser focusing degree and laser pulse stability and reduce noise interference, so as to lower testing limits and improve the sensitivity of online vacuum testing of the vacuum switch.

Abstract: The present disclosures relate generally to a tilt compensation apparatus and a tilt compensation method therefor. The tilt compensation method includes: S1: performing tilt angle calibration and horizontal rotation angle calibration on a weighing system; S2: selecting to set different specified tilt angles and different specified horizontal rotation angles, and measuring weights, tilt angles, and horizontal rotation angles under different loads; S3: calculating a weight compensation value based on the set specified tilt angles and the set specified horizontal rotation angles as well as the weights, tilt angles, and horizontal rotation angles obtained through measurement; and S4: calculating an actual weighing weight based on an actual measured weight of the weighing system and the weight compensation value. These disclosures provide more, accurate tilt compensation for weighing systems having a column-type load cell.

Abstract: The invention relates to a directional coupler, coupling high power and low power is used to replace existing two high-power directional couplers, thus reducing the cost and reducing the insertion loss of high-power radio frequency channels. The directional coupler cooperates with a control conditioning board, a splitter, a multi-path radio frequency power amplifier and a combiner to form the radio frequency power amplifier system, and the system is connected to a spectrometer; on one hand, by using a standard signal output by the spectrometer and a feedback signal of the directional coupler, nonlinearity caused by the power amplifier is corrected to achieve magnet-free linear radio frequency power amplification and anomaly protection; and on the other hand, the spectrometer can be used for monitoring the output power of the directional coupler and monitoring antenna matching, so as to provide dual protection for the radio frequency power amplifier system.

Abstract: An LED lighting device includes a seat (1), a first optical member (3), a first light source (21) and a second light source (22). The seat (1) includes a bottom portion (11) and a side portion (12). The first optical member (3) is disposed on the seat (1) and covers the bottom portion (11). The first light source (21) is disposed between the bottom portion (11) of the seat (1) and the first optical member (3). The second light source (22) is disposed on the side portion (12) of the seat (1).

Abstract: A pumping system includes an electric fracturing device and multiple power supply systems. The electric fracturing device includes a plunger pump, a main motor for driving the plunger pump, and at least one auxiliary electric device. The multiple power supply systems include at least one main power supply and at least one auxiliary power supply. The main power supply supplies electric power to the main motor, and the auxiliary power supply supplies electric power to the at least one auxiliary electric device.

Abstract: An electrically-driven fracturing system, which includes a main power generation device, a first auxiliary power generation device, a switch device, and an electrically-driven fracturing device; the electrically-driven fracturing device includes a fracturing motor and a fracturing auxiliary device; a rated generation power of the main power generation device is greater than that of the first auxiliary power generation device, a rated output voltage of the main power generation device is greater than that of the first auxiliary power generation device, the input end of the high-voltage switch group is connected to the main power generation device, the output end of the high-voltage switch group is connected to the fracturing motor, the input end of the low-voltage switch group is connected to the first auxiliary power generation device, and the output end of the low-voltage switch group is connected to the fracturing auxiliary device.

Abstract: A grading system and an application of a hydrogenation catalyst and a grading method of the hydrogenation catalyst are provided. The system contains M hydrogenation catalysts sequentially filled in a material flow direction. An R value of an Nth hydrogenation catalyst is not less than an R value of an (N?1)th hydrogenation catalyst, and the R value of at least one Nth hydrogenation catalyst is greater than the R value of the (N?1)th hydrogenation catalyst. N is an integer greater than 2 and not greater than M; the R value is a ratio of molar content of the VIII group metal element in the hydrogenation catalyst characterized by an X-ray photoelectron spectrum to weight content of the VIII group metal element in terms of oxides in the hydrogenation catalyst characterized by an X-ray fluorescence spectrum. The hydrogenation catalysts having different surface nickel atom concentrations are used for grading, thereby improving denitrification and the hydrogenation saturation performance of a catalyst system.

Abstract: This application describes systems and methods for facilitating memory access in flash drives. An example method performed by a memory controller may include receiving, from a host, a write command comprising data to be written into a flash memory; splitting the data into a first portion and a second portion; storing the first portion into a static random-access memory (SRAM) in the memory controller; storing the second portion into a dynamic random-access memory (DRAM) communicatively coupled with the memory controller; initiating a configuration operation corresponding to the write command; fetching the first portion from the SRAM and the second portion from the DRAM in response to the flash translation layer indicating a ready status to store the data into the flash memory; combining the fetched first portion and the fetched second portion; and storing the combined first portion and the second portion into the flash memory.

Abstract: This application describes systems and methods for facilitating memory access in flash drives. An example method performed by a memory controller may include receiving, from a host, a write command comprising data to be written into a flash memory; splitting the data into a first portion and a second portion; storing the first portion into a static random-access memory (SRAM) in the memory controller; storing the second portion into a dynamic random-access memory (DRAM) communicatively coupled with the memory controller; initiating a configuration operation corresponding to the write command; fetching the first portion from the SRAM and the second portion from the DRAM in response to the flash translation layer indicating a ready status to store the data into the flash memory; combining the fetched first portion and the fetched second portion; and storing the combined first portion and the second portion into the flash memory.

Abstract: A solid state drive (SSD) includes an NAND memory and an SSD controller. The SSD controller includes an interface coupled to a host machine, a nonvolatile memory controller coupled to the interface, and a processor coupled to the nonvolatile memory controller. The SSD controller is configured to: receive, via the interface, a write command from the host machine; process, by the nonvolatile memory controller, the write command; transmit, from the nonvolatile memory controller to the processor, a system message; process, by the processor according to Zoned Namespaces (ZNS) protocol, the system message; obtain, by the nonvolatile memory controller via the interface, host data for storage from the host machine; and write the host data to the NAND memory based on a result of processing the system message. Processing the system message by the processor and obtaining the host data by the nonvolatile memory controller are executed in parallel.

Abstract: This application describes systems and methods for facilitating memory access on flash drives. An example method may start with receiving a read command on a flash memory from a host specifying a logic block address (LBA). The flash memory may include a plurality of blocks grouped into a plurality of super blocks, and each of the plurality of blocks may include a plurality of pages. The method may further include determining a zone identification and an LBA offset based on the LBA; determining a flash physical address (FPA) corresponding to the LBA by accessing a mapping table stored in a random access memory (RAM) according to the zone identification and the LBA offset (e.g., the mapping table includes a plurality of FPAs arranged in a plurality of zones corresponding to the plurality of super blocks); and determining a page number and a block identification corresponding to the FPA.

Abstract: An SSD includes an MRAM, an NAND memory, and an SSD controller. The SSD controller is configured to receive first data from a host machine, save the first data to an SSD data buffer, fetch the first data from the SSD data buffer and write the first data to the MRAM via the MRAM controller, determine, by the data allocation circuit based on a characteristic of the first data, whether to save the first data to the MRAM or the NAND memory, and in response to determining saving the first data to the NAND memory, read the first data from the MRAM, write the first data to the NAND memory, and erase the first data from the MRAM.

Abstract: Disclosed is a hydrocracking catalyst, a preparation method and an application thereof. The catalyst comprises a carrier, silicon dioxide and active ingredients loaded on the carrier, wherein the carrier comprises Y molecular sieves and SAPO-34 molecular sieves. The preparation method of the hydrocracking catalyst comprises the following steps: (1) mixing materials comprising Y molecular sieves and SAPO-34 molecular sieves, and then subjecting the mixture to molding, drying and calcinating to obtain a carrier; (2) introducing silane and the active ingredients into the carrier prepared in the step (1), subsequently performing the drying and calcinating to prepare the hydrocracking catalyst. The catalyst prepared with the method can be used for hydrocracking reaction, thereby significantly increase yield of jet fuel.

Abstract: Disclosed is a hydrocracking catalyst, a preparation method and an application thereof. The catalyst comprises a carrier, silicon dioxide and active ingredients loaded on the carrier, wherein the carrier comprises Y molecular sieves and SAPO-34 molecular sieves. The preparation method of the hydrocracking catalyst comprises the following steps: (1) mixing materials comprising Y molecular sieves and SAPO-34 molecular sieves, and then subjecting the mixture to molding, drying and calcinating to obtain a carrier; (2) introducing silane and the active ingredients into the carrier prepared in the step (1), subsequently performing the drying and calcinating to prepare the hydrocracking catalyst. The catalyst prepared with the method can be used for hydrocracking reaction, thereby significantly increase yield of jet fuel.

Abstract: A turbomachine and a method of operating the turbomachine are disclosed. The turbomachine includes a stator, a rotor including a rotor bearing face, and a face seal assembly including a first segmented seal ring and a second segmented seal ring. The first segmented seal ring includes a plurality of joints and a first flat-contact surface and the second segmented seal ring includes a plurality of segment ends and a second flat-contact surface. One of the first and second segmented seal rings includes a seal bearing face. The second segmented seal ring is coupled to the first segmented seal ring such that the second flat-contact surface is in contact with the first flat-contact surface. The plurality of segment ends is circumferentially offset from the plurality of joints. The first segmented seal ring is slidably coupled to the stator and defines a face seal clearance between the rotor and seal bearing faces.

Abstract: An electric submersible pumping system for use in pumping fluids from a wellbore includes a motor, a pump driven by the motor, and a fluid expansion module connected to the motor. The fluid expansion module includes a piston seal housing and a piston assembly contained within the piston seal housing. The piston assembly includes a piston body having an exterior surface, a plurality of seals connected to the exterior surface of the piston body and a pressure equalization system. The pressure equalization system reduces a pressure differential between fluid in an annular space between the plurality of seals and fluid surrounding the first piston assembly.

Abstract: A turbomachine and a method of operating the turbomachine are disclosed. The turbomachine includes a stator, a rotor including a rotor bearing face, a face seal assembly, a first pressure cavity, and a second pressure cavity. The face seal assembly includes a seal ring including a seal bearing face, a first pressure cavity, and a plurality of isolated hydrostatic ports extending from the first pressure cavity to the seal bearing face. The face seal assembly is slidably coupled to the stator and defines a face seal clearance between the rotor and seal bearing faces. The second and third pressure cavities are defined by the stator, the rotor, and the face seal assembly. The third pressure cavity is disposed downstream of the second pressure cavity with reference to flow of a process fluid along the stator and rotor. The first pressure cavity is isolated from the second and third pressure cavities.