Abstract: A medium-voltage grid-connected photovoltaic inverter system includes: a photovoltaic inverter, a medium-voltage transformer, a medium-voltage switch, and an inverter grid-connected controller. A direct current input terminal of the photovoltaic inverter is connected to a direct current bus. A low-voltage side of the medium-voltage transformer is connected to an alternating current output terminal of the photovoltaic inverter. An input terminal of the medium-voltage switch is connected to a high-voltage side of the medium-voltage transformer, and an output terminal of the medium-voltage switch is configured to be connected to a medium-voltage grid. A current sensor is integrated in the medium-voltage switch to detect a grid-connected current of the photovoltaic inverter system and output a current detection signal.

Abstract: Provided herein are compounds of the general Formula I: and stereoisomers and pharmaceutically acceptable salts or solvates thereof, in which Ring A, Ring B, Ring C, R1, R2, L, Y, and W have the meanings given in the specification, which are inhibitors of FGFR1, FGFR2, FGFR3 and/or FGFR4 and are useful in the treatment and prevention of diseases which can be treated with an FGFR inhibitor, including diseases or disorders mediated by FGFR1, FGFR2, FGFR3 and/or FGFR4.

Abstract: Disclosed is a service life test apparatus for production of a diaphragm of a diaphragm compressor. The apparatus includes a bottom frame, a test diaphragm head, an oil pressure boosting assembly, a gas pressure boosting assembly and a driving assembly. The test diaphragm head is installed on the bottom frame and is configured to fix the diaphragm. A support frame is installed on the bottom frame. The oil pressure boosting assembly and the gas pressure boosting assembly are installed at positions of two sides of the support frame. Through the arrangement of the test diaphragm head, the pressure boosting assemblies and the driving assembly, a test load may be exerted onto the diaphragm by using gas pressure and oil pressure, and an actual work environment, the received load magnitude and the load distribution condition of the diaphragm may be simulated, so that test results may be more accurate.

Abstract: A real-time temperature-pressure detection and rapid processing system for a calibration platform, comprises an inner return pipe, and a water supply pipe is provided therein with an inner water supply pipe. An outer wall of the inner water supply pipe is connected with an inner wall of the water supply pipe through multiple springs. An outer wall of the inner return pipe is connected with an inner wall of a return pipe through multiple springs. The return pipe and the water supply pipe are made of a thermosetting polymer material. The multiple springs, the inner water supply pipe, and the inner return pipe are covered with a heat conducting material. The system further includes a temperature-pressure detection assembly. The assembly includes multiple infrared sensors arranged at two sides of the return pipe and the water supply pipe, a booster pump, a heater, and infrared sensors connected with a control unit.

Abstract: The disclosure relates to the field of underground salt cavern energy storage, and discloses a coupling numerical simulation method for site selection of an underground salt cavern hydrogen storage, which specifically comprises the following. Geological data of an area where the salt cavern hydrogen storage is to be established is obtained. A three-dimensional model is established and grid meshing is performed. An initial coupling field is established and balanced based on the geological model, and then excavation simulation of the salt cavern hydrogen storage is performed. A geological model after excavation and related parameter values thereof are imported into TOUGH2MP software, a stress model in FLAC3D software is coupled with hydraulic and thermal models in the TOUGH2MP software to simulate a stress, hydraulic, and thermal coupling behavior process of rock layers around the salt cavern hydrogen storage in the area, and a coupled simulation result is obtained.

Abstract: An assembly method for a deep in-situ high-fidelity coring calibration platform includes the following steps: S1: fixing a core bin assembly subsystem on a preset ground foundation and fixing a simulator of a core bin on a mounting base plate of the core bin assembly subsystem; S2: driving a cylinder and driving the mounting base plate to move to a preset position; S3: driving a servo motor and controlling two clips to move close to each other; S4: fixing a drill pipe bin assembly subsystem on the ground foundation; S5: assembling multiple sections of a drill pipe bin in turn; aligning and connecting a bottom of the drill pipe bin to the simulator, and aligning and communicating the top of the drill pipe bin with the lower part of an adaptive drill pipe guide structure; and S6: driving the adaptive drill pipe guide structure to perform accurate positioning.

Abstract: A medium-voltage grid-connected photovoltaic inverter system includes: a photovoltaic inverter, a medium-voltage transformer, a medium-voltage switch, and an inverter grid-connected controller. A direct current input terminal of the photovoltaic inverter is connected to a direct current bus. A low-voltage side of the medium-voltage transformer is connected to an alternating current output terminal of the photovoltaic inverter. An input terminal of the medium-voltage switch is connected to a high-voltage side of the medium-voltage transformer, and an output terminal of the medium-voltage switch is connected to a medium-voltage grid. A voltage sensor is integrated in the medium-voltage switch to detect a line voltage at the high-voltage side of the medium-voltage transformer and a line voltage at a side of the medium-voltage grid and generate a grid-connected voltage detection signal.

Abstract: The present disclosure provides a rolling and sliding adaptive device for guiding and fixing a drill pipe. The rolling and sliding adaptive device includes a mounting platform, where the mounting platform is provided with a through hole for the drill pipe to pass through. Multiple rolling and sliding support mechanisms are arranged around the through hole. The rolling and sliding support mechanisms each include a support seat. The support seat is provided with a contact element telescopic and swingable on the support seat. A telescopic drive mechanism is provided between the contact element and the support seat. The contact elements on the multiple rolling and sliding support mechanisms form a funnel-shaped structure with a large upper part and a small lower part around the through hole.

Abstract: A speaker box includes an upper cover plate, a lower cover plate, a speaker unit, and a motor module. The lower cover plate is assembled with the upper cover plate to define an accommodating cavity for accommodating the speaker unit and the motor module. The speaker unit divides the accommodating cavity into a front cavity and a rear cavity. The motor module is disposed on one side of the speaker unit. The upper cover plate includes a top wall and side walls. A length of at least one of the side walls is greater than a length of an orthographic projection thereof. Edge areas of the upper cover plate and edge areas of the lower cover plate are assembled to define compensation cavities. The lower cover plate is of a single metal sheet structure. Therefore, low-frequency performance of the speaker box is improved.

Abstract: The present disclosure discloses a speaker box including a housing having a receiving space, and a speaker unit mounted on the housing and dividing the receiving space into a front chamber and a rear chamber isolated from each other; a support member is received in the rear chamber, including a first fixation portion fixed to the speaker unit, a second fixation portion fixed to the housing, and a support portion connecting the first fixation portion and the second fixation portion; a sound hole is provided on the housing configured to connect the front chamber with outside; the first fixation portion is fixed to a yoke; the speaker box in the present disclosure has higher fixation strength and higher drop reliability.

Abstract: A speaker box and an electronic device include an upper cover plate, a lower cover plate, a speaker unit, and a motor module. The speaker box define an accommodating cavity for accommodating the speaker unit and the motor module. The speaker unit divides the accommodating cavity into a front cavity and a rear cavity. The motor module is disposed on one side, distal from the upper cover plate, of the speaker unit. The upper cover plate includes a top wall and side walls. A length of at least one of the side walls of the upper cover plate is greater than a length of orthographic projection of the at least one of the side walls thereof. Edge areas of the upper cover plate and edge areas of the lower cover plate are assembled to define compensation cavities. Therefore, low-frequency performance of the speaker box is improved.

Abstract: A speaker box and an electronic device are disclosed. The speaker box includes an upper cover plate including side walls, a first lower cover plate, a speaker unit, a motor module, and second lower cover plates. The speaker unit divides an accommodating cavity defined by upper cover plate and first lower cover plate into front and back cavities. The second lower cover plates are assembled with the upper cover plate to define compensation cavities. A length of at least one of the side walls of the upper cover plate is greater than that of an orthographic projection thereof, so the speaker box is suitable for various electronic devices and has strong adaptability and wide application. The compensation cavities are communicated with the back cavity, which increases an overall space of the back cavity, improves low-frequency performance of the speaker unit, and improves sound production effect of the speaker unit.

Abstract: The present invention provides a bending foam assembly and a speaker box including the bending foam assembly. The bending foam assembly includes a foam layer, a first back adhesive layer, an air-permeable isolation layer, and a second back adhesive layer sequentially. The bending foam assembly further includes a third back adhesive layer and a metal foil layer disposed between the foam layer and the first back adhesive layer. The bending foam assembly mounted on a housing of the speaker box through the second back adhesive layer. The bending foam assembly of the present invention avoids the problem of warping in application by adding the metal foil layer.

Abstract: The present disclosure discloses a speaker box including a housing having a receiving space and a speaker unit received in the receiving space. The housing and the speaker unit encloses a front cavity and a rear cavity isolated from each other. A mesh disposed in the rear cavity is configured to enclose a filling chamber with the bottom cover for filling sound-absorbing particles. A steel sheet of the bottom cover includes a protrusion connected to the mesh. And, a damping member opposite to the protrusion is sandwiched between the mesh and the yoke; the speaker box in the present disclosure has higher drop reliability.

Abstract: A bottom cylinder for a high-temperature and high-pressure environment simulator of a high-fidelity corer is provided. The bottom cylinder includes a cylinder barrel. The bottom of the cylinder barrel is provided with a cylinder base. The piston is provided inside the cylinder barrel and divides an inner cavity of the cylinder barrel into a rodless cavity and a rod cavity. The piston is provided with a piston rod. The outer wall of the cylinder barrel is provided with an oil inlet hole communicated with the rodless cavity, an oil outlet hole communicated with the rod cavity, and a reserved hole. The lower end surface of the piston is provided with a first buffer ring, and the upper surface of the cylinder base is provided with a second buffer ring mated with the first buffer ring. The bottom cylinder is applied to the simulator for oil and gas resource exploitation.

Abstract: The present disclosure relates to compounds and compositions for inhibition of RAF serine/threonine protein kinases and inhibition of Bcr-Abl tyrosine kinases, methods of preparing said compounds and compositions, and their use in the treatment of various cancers, such as melanoma, non-small cell lung cancer, and chronic myeloid leukemia (CML).

Abstract: The disclosure relates to the field of underground salt cavern energy storage, and discloses a coupling numerical simulation method for site selection of an underground salt cavern hydrogen storage, which specifically comprises the following. Geological data of an area where the salt cavern hydrogen storage is to be established is obtained. A three-dimensional model is established and grid meshing is performed. An initial coupling field is established and balanced based on the geological model, and then excavation simulation of the salt cavern hydrogen storage is performed. A geological model after excavation and related parameter values thereof are imported into TOUGH2MP software, a stress model in FLAC3D software is coupled with hydraulic and thermal models in the TOUGH2MP software to simulate a stress, hydraulic, and thermal coupling behavior process of rock layers around the salt cavern hydrogen storage in the area, and a coupled simulation result is obtained.

Abstract: A high-temperature and high-pressure simulator for a deep in-situ environment is provided. The simulator includes a high-fidelity sample chamber, where a lower end of the high-fidelity sample chamber is provided with a bottom cylinder. A lower end of the bottom cylinder is provided on a base. A piston rod of the bottom cylinder extends into the high-fidelity sample chamber, and an upper end of the piston rod is provided with a rock sample seat. An upper end of the high-fidelity sample chamber is provided with a rock sample cap. The top of the high-fidelity sample chamber is sealed by an end cap of the high-fidelity sample chamber. An upper end of the end cap of the high-fidelity sample chamber is provided with a multi-section coring drill chamber. The uppermost section of the coring drill chamber is connected to a lift cylinder.

Abstract: The invention provides an optical coherence tomography self-testing system, an optical coherence tomography method and an ocular disease monitoring system. The optical coherence tomography self-testing system comprises a camera device, an external display module and a communication module. The camera device includes an image-capturing module and a processing module. The image-capturing module captures a plurality of ocular images. The processing module is connected to the image-capturing module, and the processing module determines whether a position offset value between the pupil center position of a tested eyeball and an optical axis of the image-capturing module is within a preset error range. If the position offset value is within the preset error range, the plurality of ocular images is stored as a plurality of displayed images. The external display module displays one of the plurality of displayed images and a status light after the image-capturing module has completed image capturing.

Abstract: Disclosed is a method for preparing a composite loaded with nano-magnesium hydride, including: adding a cationic surfactant into an aqueous dispersion of a two-dimensional transition metal carbide such that a nanosheet of the two-dimensional transition metal carbide wrinkles, to avoid re-stacking, and then washing and drying; placing a dried product into a sealed container, vacuuming the sealed container, heating to a high temperature, and holding at the high temperature for a period of time; filling the sealed container with high-pressure hydrogen and holding for a period of time to obtain a heated product; adding the heated product and dibutyl magnesium into an organic solvent, conducting ultrasonic dispersion, then heating under stirring at a hydrogen pressure of 3 MPa to 6 MPa and a temperature of 180° C. to 220° C. for 12 h to 48 h, and centrifuging and drying to obtain the composite loaded with nano-magnesium hydride.