Tsinghua University

Beijing Yakebot Technology Co., Ltd

Boe Technology Group Co., Ltd.

Hefei Xinsheng Optoelectronics Technology Co., Ltd.

Beijing Bytedance Network Technology Co., Ltd.

Beijing Youzhuju Network Technology Co., Ltd.

Wanhua Chemical Group Co., Ltd.

Wanhua Chemical (ningbo) Co., Ltd.

Transport Planning and Research Institute Ministry of Transport

Wanhua Chemical (beijing) Co., Ltd.

Chen Shen

Lifeng Wang

Ying Li

Hongpeng Liu

Jianyong Ren

Shaowei Huang

Jian Wang

Ming Wang

Dongfang Wang

Chen Wang

Qinghe Wang

Haitao Wang

Tongshang Su

Feng Liu

Yi Zhao

Guangyao Li

Wei Jiang

Jun Hong Zhao

Peng Yang

Zhaoqin Lin

Qifan Zheng

Jun Huang

Yulong Wang

Zhichao Lv

Shifeng Wang

Youpeng Gan

Jun Hao

Yue Qi

Peng Wei

Ruidong Wang

Yun Feng

Shiyong Wu

Peixin Yu

Yuanlin Ren

Xianghui Zeng

Zhibo Zhao

Chenglong Gui

Yaping Mao

Linan Gao

Xiaoning Zhang

Hanbing Sun

Wentao Ding

Yankan Song

Haiyuan Yao

Shilin Gao

Zhendong Tan

A method for determining synchronization transient stability of a power system and an electronic device are provided. The synchronous energy function corresponding to the power system model is determined; the synchronization convergence region is determined according to the synchronization energy function; it is determined whether the power system is transient stable according to the synchronization convergence region and the initial value of power system after fault; and adjusting parameters of the power system in response to determining that the power system is transient unstable.

Method and apparatus for determining synchronization transient stability of power system

The embodiments of the disclosure provide an immersion liquid cooling device and a liquid cooling system. The liquid cooling device includes a cabinet comprising a first cavity and a second cavity integrated on a side wall of the first cavity; and a heat exchange module adapted to be inserted into the second cavity via an opening on the second cavity, and comprising a heat exchanger, a coolant driving device and a guiding assembly, the heat exchanger being configured to cool the first coolant with the second coolant, the coolant driving device being configured to drive the first coolant to circulate between the second cavity and the first cavity, and the guiding assembly comprising a liquid flow channel configured to guide the first coolant from the coolant driving device to the heat exchanger.

Immersion liquid cooling device and liquid cooling system

Embodiments of the present application provides a method and a system for evaluating implanting precision of an implant. The method includes: obtaining a second surface model of an oral cavity containing a target implant; obtaining an actual position of the target implant in a first three-dimensional model based on the second surface model, the first three-dimensional model and a first surface model; and obtaining an evaluation result of the implanting precision of the target implant based on the actual position of the target implant in the first three-dimensional model and an predicted position of the target implant in the first three-dimensional model. By means of the method and system according to the embodiments of the present application, the second surface model of the oral cavity containing the target implant is obtained after implantation is completed using an oral digital scanning device to obtain the evaluation result of the implanting precision of an implant of the target implant. More accurate evaluation result of implant can be obtained due to the elimination of metallic implant artifacts in the obtained secondary surface model as compared to the three-dimensional digital model obtained based on CT device in the prior art.

Method and system for evaluating implanting precision of an implant

A registration method and an electronic device for visual navigation in dental implant surgery, comprising obtaining a three-dimensional model of a target tooth to be registered, an entity model of the target tooth and a second model of the target tooth, obtaining a position and attitude matrix of the three-dimensional model in a virtual coordinate system according to the coordinates of at least three points on a three-dimensional model of a substrate after the registration of the three-dimensional model in the virtual coordinate system, mounting the entity model of the target tooth onto a registration standard board, obtaining a position and attitude matrix of the entity model in the visual coordinate system according to three optical marks and the points on the entity model corresponding to the three points, and obtaining a correspondence between the virtual coordinate system and the visual coordinate system according to two position and attitude matrices.

Registration method for visual navigation in dental implant surgery and electronic device

Disclosed is a denture tray for visual marking and a manufacturing method thereof. The method comprises: establishing a three-dimensional model of a target dentition of a target patient; obtaining a three-dimensional model of a substrate of a denture tray based on the three-dimensional model of the target dentition; providing a through hole at a preset position on the three-dimensional model of the substrate of the denture tray; establishing a three-dimensional model of a fixed connection portion on an outer side surface of the three-dimensional model of the substrate of the denture tray to form a three-dimensional model of the denture tray, wherein the three-dimensional model of the fixed connection portion is integrally connected with the three-dimensional model of the substrate of the denture tray; and manufacturing the denture tray based on the three-dimensional model of the denture tray.

Denture tray for visual marking and manufacturing method thereof

A multimedia information processing method, apparatus, electronic device, and medium are provided. The method includes: receiving a user's selection operation for any piece of multimedia information among multimedia information to be processed, the multimedia information to be processed comprising at least two pieces of multimedia information, any piece of multimedia information being any piece of multimedia information except the last piece; determining a target multimedia information piece on the basis of a selected operation; upon receiving a trigger operation for the target multimedia information piece, determining a corresponding processing method; on the basis of the determined processing method, correspondingly processing the target multimedia information piece. Thus, the complexity of processing multimedia information is reduced and efficiency is improved, thereby improving user experience.

Multimedia information processing method, apparatus, electronic device, and medium

The present disclosure provides an optimization method, a unit, and an electronic device of a shifted frequency (SF)-based electromagnetic transient simulation, comprising: determining a current amplitude and a voltage frequency based on a node voltage and a branch current calculated from a shifted frequency on a basis of a current time step; determining an optimal shifted frequency of the current time step based on the current amplitude and the voltage frequency; and updating the shifted frequency by adopting the optimal shifted frequency of the current time step for calculating a node voltage and a branch current of the next time step. The method, the unit, and the electronic device provided in the present disclosure may gradually update and optimize the shifted frequency in the simulation process so to enable the shifted frequency to reach the best, thus ensuring the accuracy of output current and voltage simulation results.

Optimization method, unit, and electronic device of shifted frequency (SF)-based electromagnetic transient simulation

Provided are a detection method and a detection device, the detection method includes: in a first writing stage, providing an active voltage to each data line, each power supply terminal, both ends of a first gate line to-be-detected, an absolute value of the active voltage of each data line is smaller than that of the active voltage of the power supply terminal, an absolute value of the active voltage of the first gate line to-be-detected is smaller than that of the active voltage of each data line; in a first detection stage, maintaining the active voltage of the power supply terminal, providing an inactive voltage to the first gate line to-be-detected and providing an active voltage to the data line, detecting voltages at second electrodes of storage capacitors corresponding to the first gate line to-be-detected, determining whether the first gate line to-be-detected has breakpoint according to the detected voltages.

Detection method and detection device for display substrate

The present disclosure provides a method for improving the computational efficiency of an electromagnetic transients program (EMTP-type) phase domain synchronous machine model. The method comprises: acquiring a traditional phase domain synchronous machine model; acquiring matrix relations between mutual inductance matrices of stator windings and rotor windings according to a trigonometric transformation equation; substituting the matrix relations into the original expression of Rand the original formulation of e(t), respectively, and deriving to obtain a simplified formulation of the equivalent resistance matrix Rand a simplified formulation of the total history term e(t); and acquiring an efficient phase domain synchronous machine model. According to the embodiment of the disclosure, in the provided model, the equivalent resistance matrix of the phase domain synchronous machine model and the matrix used in the calculation of the history term are converted into constant sparse matrices, thereby improving the calculation efficiency of the model.

Method and device for improving efficiency of electromagnetic transients program phase domain synchronous machine model

A method of extracting an image of a port wharf through multispectral interpretation includes: first, extracting a blurred coastline by assigning values to grayscale values; then, performing a smoothing and noise removal processing on a remote sensing image in a targeted area to extract edge information; sequentially, establishing a multispectral database of a targeted port wharf; and extracting a port wharf using a projected eigenvector, performing an MAF transformation on the regularized kernel function again, projecting multivariate observed values to original eigenvectors, and identifying a remote sensing image area corresponding to the original eigenvector smaller than a transformation variance as a port wharf to be extracted, and then carrying out a validation operation.

Method of extracting image of port wharf through multispectral interpretation

The present invention discloses a viscoelastic sound-absorbing polyurethane foam and a method for preparing the same, the foam being prepared by reacting a polyisocyanate composition and an isocyanate reactive component. The isocyanate reactive component comprises, based on the weight of mixed polyethers, 30-80 wt % of (bii) a copolyol of epoxypropane-epoxyethane, or a conjugate thereof, wherein the content of oxy-ethylidene unit is 5-35 wt %; 2-20 wt % of (biii) a copolyol of epoxypropane-epoxyethane, or a conjugate thereof, wherein the content of oxy-ethylidene unit is 70-100 wt %; and 20-70 wt % of (biv) a copolyol of epoxypropane-epoxyethane, or a conjugate thereof, wherein the content of oxy-ethylidene unit is 0-20 wt %. The sound-absorbing foam of the present invention has a ball rebound rate of 15-30% and good sound absorption performance.

Viscoelastic sound-absorbing polyurethane foam and preparation method thereof

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Beijing, China

Chen Shen