Abstract: A method for enhancing transient stability of a renewable energy power system is performed as follows. An external subsystem corresponding to the renewable energy power system is constructed. A first matrix corresponding to the external subsystem based on voltage control is constructed. A second matrix corresponding to the renewable energy power system is generated. A transient stability Lyapunov function corresponding to the renewable energy power system is constructed in real time based on the first matrix and the second matrix. A first control signal corresponding to the renewable energy power system is generated based on Lyapunov's second method. The transient stability of the renewable energy power system is controlled and enhanced in real time based on the first control signal. The first control signal is an adaptive voltage control signal of the renewable energy power system.

Abstract: A dynamic stability control method for power systems with renewable energy, in which a non-linear system of a grid-forming inverter corresponding to a renewable energy power system is created. An external subsystem corresponding to the grid-forming inverter is constructed based on a Lie derivative. According to the external subsystem, a linear sliding surface corresponding to the external subsystem is constructed, and a dynamic stability control unit corresponding to the external subsystem is generated based on sliding mode control. A first instruction data corresponding to the dynamic stability control unit is generated to control dynamic stability of the renewable energy power system in real time. The voltage instruction value of the grid-forming inverter is modified to improve the dynamic stability of the renewable energy power system. A system for implementing such method is also provided.

Abstract: The present invention relates to a process for producing succinic anhydride by maleic anhydride hydrogenation, comprising (1) feeding a maleic anhydride solution and a hydrogen raw material respectively to a first-stage hydrogenation reactor from an upper liquid-phase feed port and a top gas-phase feed port of the first-stage hydrogenation reactor for a first-stage hydrogenation reaction to obtain a first-stage hydrogenation product; (2) feeding the first-stage hydrogenation product to a second-stage hydrogenation reactor for a second-stage hydrogenation reaction to obtain a second-stage hydrogenation product, optionally, before entering the second-stage hydrogenation reactor, subjecting the first-stage hydrogenation product to a first-stage gas-liquid separation to obtain a first-stage gas phase and a first-stage liquid phase, and then feeding the first-stage gas phase and the first-stage liquid phase respectively from a top gas-phase feed port and an upper liquid-phase feed port of the second-stage hydrogen

Abstract: The present disclosure is related to systems and methods for processing X-ray images. A method for processing an X-ray image may include obtaining an X-ray image; and determining a metal image based on the X-ray image by using a trained metal detection model. The metal image includes information of a metal object in the X-ray image.

Abstract: Provided are a gut bacterium strain and uses thereof, particularly, the gut bacterium strain with an accession number of GDMCC 62983 (Alistipes indistinctus Xia-1), and a method for the treatment and/or prevention of hyperuricemia using the gut bacterium strain of the present invention. The gut bacterium strain of the present invention has a therapeutic effect on lowering uric acid and a high safety, solving the technical problems of side effects caused by long-term intake of common drugs for hyperuricemia on the market, as well as the poor effect of controlling diet.

Abstract: The present disclosure relates to ester derivatives of N4-hydroxycytidine (NHC), to pharmaceutical compositions comprising thereof, to the preparation method thereof, and to the use and method of the ester derivatives of N4-hydroxycytidine to treat viral infections.

Abstract: The present disclosure relates to a compound containing cycloalkyl or haloalkyl, and specifically discloses a compound represented by formula I?, a stereoisomer or a pharmaceutically acceptable salt thereof, a preparation method therefor, a pharmaceutical composition containing the compound, and a use thereof in treating tumors.

Abstract: The present disclosure relates to systems and methods for image processing. The system may obtain at least one image of an object. For each of the at least one image, the system may determine a recognition result of the image. The recognition result may include an image type of the image, a type of a lesion in the image, a region of the lesion in the image, and/or an image feature of the image. Further, the system may process the at least one image of the object based on at least one recognition result corresponding to the at least one image.

Abstract: Provided are a stable cross-linking curing agent, and a walnut dreg-derived fibrous tissue protein prepared by a multi-stage temperature-variable moderate extrusion device in conjunction with a green stable cross-linking curing agent. The stable cross-linking curing agent includes inulin, sodium carboxymethyl cellulose, a sea buckthorn dreg-derived polysaccharide, and a resistant dextrin. The walnut dreg-derived fibrous tissue protein includes a walnut dreg, a vital wheat gluten, and the stable cross-linking curing agent.

Abstract: Disclosed are a narrow gap laser-TIG arc hybrid welding apparatus and method. The welding apparatus includes a welding gun body, a swing welding gun assembly, a welding wire feeding and heating assembly, and a gas conveying assembly; the swing welding gun assembly includes a welding gun rotating shaft, a stepper motor, a large gear, a pinion, an upper insulating sleeve, a lower insulating sleeve, a tungsten electrode clamp, and a tungsten electrode; the stepper motor is mounted on a motor connection seat; the pinion is mounted on the output shaft of the stepper motor; the large gear is mounted on the welding gun rotating shaft; the pinion is engaged with the large gear; the welding gun rotating shaft is mounted and positioned on the welding gun body; the tungsten electrode is mounted at the tail end of the welding gun rotating shaft by means of the tungsten electrode clamp.

Abstract: An automatic recognition method for a dry quasi-stationary front in Kunming, Yunnan, China is provided. The automatic recognition method includes: reading data; calculating, by a differential method, a temperature lapse rate between each layer of each point from a ground surface to 650 hPa, and acquiring a maximum inversion trend value; acquiring an initially selected inversion distribution based on the maximum inversion trend value; removing a nighttime clear sky radiation inversion, retaining only a frontal inversion, and binarizing (0, 1); finding a boundary between inversion and non-inversion; removing the abnormal candidate frontal points, and acquiring frontal nodes; removing meso- and micro-scale systems; and performing one-dimensional Gaussian filtering on longitude data of the frontal nodes, and connecting the filtered frontal nodes to acquire a quasi-stationary front in Kunming, Yunnan, China.

Abstract: Compounds, particles, and cathode active materials that can be used in lithium ion batteries are described herein. Methods of making such compounds, powders, and cathode active materials are described. The particles have a particle size distribution with a D50 ranging from 10 ?m to 20 ?m.

Abstract: Provided are a secondary cured UV pressure-sensitive adhesive, and preparation methods for same and an explosion-proof film. The secondary cured UV pressure-sensitive adhesive is composed of the following materials, in percentages by mass: 31-35% of a hydroxyl-containing polyacrylate prepolymer, 6-9% of pentaerythritol triacrylate, 3-5% of 2-hydroxyl-3-phenoxy propane acrylate, 2-3% of an isocyanate curing agent, 2-3% of photo initiator 184, and 50% of ethyl acetate. The secondary cured UV pressure-sensitive adhesive is prepared by carrying out a thermal curing cross-linking reaction of a hydroxyl-containing polyacrylate prepolymer, pentaerythritol triacrylate and 2-hydroxyl-3-phenoxy propane acrylate by using an isocyanate curing agent, and initiating a free radical polymerization of pentaerythritol triacrylate and 2-hydroxyl-3-phenoxy propane acrylate by using photo initiator 184.

Abstract: A medical imaging system includes a camera to obtain a captured image including a subject under examination, a display for displaying a graphical user interface including the captured image, and a first boundary indication and a second boundary indication for superimposing and displaying an exposure region on the captured image, an input device for receiving an input operation for adjusting a position of the first boundary indication and an input operation for adjusting a position of the second boundary indication, and a controller for determining the position of the first boundary indication and the position of the second boundary indication according to the input operations received by the input device, and determining a position of an anatomical site. When the position of the anatomical site changes in the captured image, the position of the first boundary indication and the position of the second boundary indication change.

Abstract: A medical imaging system includes an imaging apparatus including an X-ray source and a detector, wherein the X-ray source and the detector are capable of cooperating to acquire a medical image of a subject under examination, and the medical image is formed by stitching a first number of sub-medical images, the first number being greater than or equal to 2, a display apparatus used to display a graphical user interface including a parameter configuration display window, wherein the parameter configuration display window simultaneously displays an exposure parameter for each of the first number of sub-medical images, and a control apparatus used to perform exposure according to a set exposure parameter for the first number of sub-medical images, and to generate the medical image by performing stitching according to the first number of sub-medical images after the exposure.

Abstract: A wearable device may include a head-mounted display (HMD) for rendering a three-dimensional (3D) virtual object which appears to be located in an ambient environment of a user of the display. The relative positions of the HMD and one or more eyes of the user may not be in desired positions to receive, or register, image information outputted by the HMD. For example, the HMD-to-eye alignment may vary for different users and may change over time (e.g., as a user moves around and/or the HMD slips or is otherwise displaced). The wearable device may determine a relative position or alignment between the HMD and the user's eyes. Based on the relative positions, the wearable device may determine if it is properly fitted to the user, may provide feedback on the quality of the fit to the user, and may take actions to reduce or minimize effects of any misalignment.

Abstract: Compounds and methods for modulating the activity of receptors are disclosed. Some of the compounds modulate the activity of glycine receptors. Certain embodiments of the compounds are useful for treatment of pain, treatment of opioid addiction, and/or reduction of side effects attributable to opioid use.

Abstract: This application discloses a packet processing method, comprising: A storage server receives a first packet, where the first packet includes a first service layer and a check value of the first service layer, and the first service layer includes payload data. The storage server obtains a check value of the payload data through calculation based on the first service layer and/or the check value of the first service layer. The storage server sends a second packet to a gateway device, where the second packet includes a second service layer, a check value of the second service layer, and the check value of the payload data, the second service layer is obtained based on the first service layer, and the check value of the second service layer is obtained through calculation based on the second service layer and the check value of the payload data.

Abstract: The present disclosure relates to systems and methods for defining and modifying behavior in an extended reality environment. The systems and methods include receiving a request to build or modify a rule or policy for a given user or activity, obtaining a template based on the user or the activity, displaying the template and tools for editing the template, receiving a modification to the template via the user interacting with the tools of the user interface, and modifying the template based on the modification to generate the rule or policy. The modification includes changing the initial value for the actions or the conditions of the template and saving the template as a separate instance representative of the rule or policy, and the rule or policy includes one or more conditional statements for executing one or more of the actions based on evaluation of one or more of the conditions.

Abstract: The technology of this application relates to a packet processing method, a gateway device, and a storage system, and belongs to the field of storage technologies. In this disclosure, a request for accessing a non-volatile memory express (NVMe) node is converted into a request for accessing a remote direct memory access (RDMA) node. Because a storage medium of the NVMe node is a hard disk, and a storage medium of the RDMA node is a memory, the memory can provide a faster read/write speed than the hard disk. Therefore, storage performance is improved. In addition, this helps a conventional NVMe over fabrics (NOF) storage system expand an RDMA memory pool, and improves flexibility of networking and capacity expansion of the storage system.