Dalian University of Technology

Xi'an Modern Chemistry Research Institute

Beijing Xiaomi Mobile Software Co., Ltd.

Xidian University

Research Institute of Shaanxi Yanchang Petroleum (group) Co., Ltd.

Huawei Device Co., Ltd.

China Iwncomm Co., Ltd.

Honor Device Co., Ltd.

Wei Zhang

Fuzheng Yang

Bo Wang

Xiang Yan

Ke Zhang

Hui Ma

Mary-Luc Georges Henry Champel

Chunying Li

Fengxian Li

Wei Mao

Zhijun Hao

Zhenhua Zhang

Chengwei Wu

Jianli Ma

Sheng Han

Yongmei Du

Jian Lu

Hua Zhang

Jian Lv

Yue Qin

Ruimin Gao

Xiao Han

Yuan Zhang

Gang Chen

Fei He

Jijun Zeng

Yongtao Lv

Guojun Ma

Liangang Kou

Yanhui Li

Xiongfu Zhang

Dapeng Li

Yongbin Lu

Shuqin Zhang

Mingfeng Wang

Pengju Huo

Si Li

Zhiling Liu

Ting Pei

Yangbo Ma

Weigang Tong

Yujie Gu

Tian Chen

Xiaobo Tang

Xiaolong An

Yuxin Du

Yingmin Wang

Weihao Sun

Leiqiang Lai

Dianguo Ma

Yucun Tian

Jiuchang He

Haiou Liu

Yuting Niu

Weiwu Xu

Chengda Wang

Jianping Kang

Zhiqiang Yang

Zexing Sun

A method for encoding a point cloud to generate a bitstream of compressed point cloud data is provided. The point cloud's geometry is represented by an octree-based structure with a plurality of nodes having parent-child relationships by recursively splitting a volumetric space containing the point cloud into sub-volumes each associated with a node of the octree-based structure. The method includes: determining a coding mode, wherein the coding mode includes a planar coding mode and an angular coding mode; obtaining coding context information for a present child node, entropy encoding the present child node based on the obtained coding context information to produce encoded data for the bitstream.

Method for encoding and decoding, encoder, and decoder

A method for encoding attributes of points of a point cloud, includes: determining a true transform coefficient by applying RAHT to attributes of a present node; determining a difference between attributes of a present parent node and each parent node of a first set of parent nodes sharing a face or an edge with the present node; selecting a second set of parent nodes from the first set of parent nodes according to the difference; determining a predicted value for the attributes of the present node according to attributes of the second set of parent nodes; determining a predicted transform coefficient by applying the RAHT to the predicted value of the attributes of the present node; determining a residual from the true transform coefficient and the predicted transform coefficient; and encoding the residual to produce encoded data of attributes of the point cloud for a bitstream.

Method for encoding and decoding a point cloud

A method for encoding and decoding, an encoder and decoder for a point cloud. The method for encoding a point cloud to generate a bitstream of compressed point cloud data, in which the point cloud's geometry is represented by an octree-based structure with a plurality of nodes having parent-child relationships by recursively splitting a volumetric space containing the point cloud into sub-volumes each associated with a node of the octree-based structure, includes: determining an occupancy pattern for a parent node based on the occupancy of its child nodes; determining a planar context information for at least one of the child nodes; and entropy encoding/decoding the occupancy pattern parent node based on the determined planar context information to produce encoded/decoded data for the bitstream.

Method and apparatus for processing a point cloud

A high aspect ratio in-plane metal microneedle array, a manufacturing method and a clamping and inserting auxiliary device thereof is disclosed. A large-size metal sheet is cut into small metal sheets. A clamping tooling composed of two upper and lower metal cover plates is processed. Inner sides of the upper and the lower cover plates of the tooling are provided with grooves in which the metal sheets are placed and fastened by bolts. Wire cutting is conducted on the tooling and the metal sheets as a whole to obtain a plane metal microneedle array with a plurality of microneedle bodies. In addition, an assembling and clamping device and an inserting auxiliary device of the high aspect ratio in-plane metal microneedle array is provided. The assembled inserting auxiliary device is placed on skin, and the microneedle array is inserted into the skin through the auxiliary device.

Method of manufacturing an in-plane metal microneedle array

This invention belongs to the technical field of cell mechanics and provides a modified method to fit cell elastic modulus based on Sneddon model. The process of the conical atomic force microscope probe compressing into the cell was simulated by ABAQUS. The simulation results are compared with the Sneddon model to get the error caused by Sneddon model. The fitting errors of Sneddon model under different circumstances were obtained by using the method of function fitting, so as to realize the modification of Sneddon model to fit cell elastic modulus. As a modified method to fit cell elastic modulus based on Sneddon model, it can be used to measure the elastic modulus of cells more accurately. The design process is convenient and fast. The design method is easy to master, and the process of use is convenient and simple.

Modified method to fit cell elastic modulus based on Sneddon model

Boron-based amorphous alloys and a preparation method thereof is provided. The composition formula of the alloys is BCoREX1X2X3, wherein RE is any one or more of La, Ce, Pr, Nd, Sm, Gd, Dy, Er and Y; X1 is any one or more of C, Si and Al; X2 is any one or two of Fe and Ni; X3 is any one or more of Zr, Nb, Mo, Hf, Ta and W; and a, b, c, d, e and f respectively represent atomic percent of each corresponding element in the formula, where: 45&#x2264;a&#x2264;55, 25&#x2264;b&#x2264;40, 10&#x2264;c&#x2264;20, 0&#x2264;d&#x2264;10, 45&#x2264;a+d&#x2264;55, 0&#x2264;e&#x2264;20, 25&#x2264;b+e&#x2264;40, 0&#x2264;f&#x2264;3, 10&#x2264;c+f&#x2264;20 and a+b+c+d+e+f=100. The preparation method of the boron-based amorphous alloy comprises: preparing master alloy ingots using an arc furnace or an induction melting furnace; and then obtaining amorphous ribbons with different thicknesses by a single copper roller melt-spinning equipment.

Boron-based amorphous alloys and preparation method thereof

Disclosed in the present invention are a credential information processing method and apparatus for network connection, and an application (APP). The method comprises: in response to an instruction for applying for a network credential for a second terminal, a first terminal sends a first credential downloading request to a server; the first terminal receives first credential information sent by the server; and the second terminal receives the first credential information sent directly by the first terminal from a system memory of the first terminal and a network identifier of a wireless network to be connected, the second terminal stores the first credential information directly into a secure storage region of the second terminal from a system memory of the second terminal, and the second terminal connects a wireless network corresponding to the network identifier by using the first credential information in the secure storage region.

Credential information processing method and apparatus for network connection, and application (APP)

An in-plane metal microneedle array and a manufacturing method therefor is disclosed. A large-size metal sheet is cut into small metal sheets. Inner sides of the upper and the lower cover plates of the tooling are provided with grooves matched with the sizes of the small metal sheets. Through holes are formed at edges around the cover plates. The metal sheets are placed in the grooves and fastened through bolts. The geometry and the size of a sheet microneedle array are designed, and a CAD model of the plane microneedles is built. A wire path is cut according to the CAD model. A few materials are reserved on both sides of substrates of the microneedle array without cutting. The unprocessed parts on both sides of the microneedle substrate are cut to obtain an in-plane metal microneedle array with a plurality of microneedle bodies.

In-plane metal microneedle array and manufacturing method therefor

A kind of nano-porous Fe&#x2014;Pt alloys with strong permanent magnetism and a preparation method therefor. The nano-porous Fe&#x2014;Pt alloys have the composition of FeCoPtPdand are composed of an ordered hard magnetic L1-FePt phase, and have an integrated doubly-connected nano-porous structure with pore sizes of 10-50 nm, and ligament thicknesses of 20-80 nm. Under an applied magnetic field of 50 kOe, the coercivity, magnetization intensity and remanence of the alloys are 13.4-18.5 kOe, 40.4-56.3 emu/g and 28.3-37.4 emu/g, respectively. The master alloy ingots are prepared using electric arc melting or induction melting; the alloy ribbons are prepared using the single-roller melt-spinning equipment; the precursors mainly containing nano-composite phases of hard magnetic L1-FePt and soft magnetic FeB are obtained directly by the melt-spinning or obtained by conducting vacuum annealing on the melt-spun ribbons; and the nano-porous Fe&#x2014;Pt alloys with a single L1-FePt phase are obtained by the electrochemical dealloying technique, thereby filling in the technical blank of nano-porous metal materials with permanent magnetism.

Nano-porous alloys with strong permanent magnetism and preparation method therefor

A method for directly preparing an empty shell type small grain ZSM-5 molecular sieve. The method comprises: uniformly mixing and stirring an organic template agent, a silicon source and water; dripping an aqueous solution of an aluminum source into the mixture; preserving room temperature, and continuously stirring for a period of time; and performing hydrothermal crystallization, and washing, drying and roasting the obtained product to obtain the molecular sieve. The molecular sieve has high degree of crystallinity and uniform particle size. Moreover, the method requires short time, simple operation and only one step, no extra surfactant is needed, and secondary acid and alkali treatment is not needed.

One-step preparation method for hollow shell type small grain ZSM-5 molecular sieve

A rapid synthesis method of a small-crystal-grain ZSM-5 molecular sieve, the method comprising: preparing a mixed silicon-aluminum glue solution, placing the solution in a crystallization kettle for low-temperature nucleation, enabling high-temperature crystallization growth of the solution, and obtaining a crystallization product, namely, a small-crystal-grain ZSM-5 molecular sieve, the nucleation temperature being 60-120&#xb0; C., nucleation time being 1-3 hours, a crystallization growth temperature being 150-170&#xb0; C., and crystallization growth time being 1-3 hours. The method is easy to operate, and has a short operation time, thus being able to complete within 6 hours; in addition, the product has uniform grain sizes, is in a mono-dispersed state, and has a high crystallization degree to a submicron degree.

Rapid synthesis method of small-crystal-grain ZSM-5 molecular sieve

Disclosed in the present invention are a chromium-free gas phase fluorination catalyst and an application thereof. The precursor of the related chromium-free gas phase fluorination catalyst consists of a compound containing iron element, a compound containing rare earth metal element and a compound containing element A, wherein element A is one selected from Ca, Al, Mg and Ti, the precursor is subjected to roasting and fluorination treating to obtain the chromium-free gas phase fluorination catalyst. The precursor of the catalyst is roasted at 400-500&#xb0; C. and fluoridized with hydrogen fluoride at 350-450&#xb0; C. to obtain the chromium-free gas phase fluorination catalyst. The catalyst has characteristics of being chromium-free and environment-friendly, good catalytic activity and long life etc. The catalyst can be used for preparing hydrofluoroolefins or hydrochlorofluoroolefins from halohydrocarbons.

Chromium-free catalyst for gas-phase fluorination and application thereof

A process for the joint preparation of 1,3,3,3-tetrafluoropropene and 2,3,3,3-tetrafluoropropene, comprising: (a) starting materials comprising at least one compound having the structure of formula I, II or III are reacted with hydrogen fluoride, producing 1,2,3-trichloro-3,3-difluoropropene, 1,2,3-trichloro-1,1,2-trifluoropropane, and 1,2,3-trichloro-1,1,3-trifluoropropane; in the compounds of said formulae CFCl&#x2550;CCl&#x2014;CHFCl(Formula I), CFClCHCl&#x2550;CHCl (Formula II), and CFClCFClCHFCl(Formula III), m=0, 1, 2; n=1, 2; p=2, 3; x=1, 2, 3; y=1, 2; z=1, 2 and 4&#x2266;x+y+z&#x2266;6; (b) the 1,2,3-trichloro-3,3-difluoropropene, 1,2,3-trichloro-1,1,2-trifluoropropane and 1,2,3-trichloro-1,1,3-trifluoropropane undergo dechlorination, producing 3-chloro-3,3-difluoropropyne, 3-chloro-2,3,3-trifluoropropene and 3-chloro-1,3,3-trifluoropropene; and (c) the 3-chloro-3,3-difluoropropyne, 3-chloro-2,3,3-trifluoropropene and 3-chloro-1,3,3-trifluoropropene are reacted with hydrogen fluoride, simultaneously yielding 1,3,3,3-tetrafluoropropene and 2,3,3,3-tetrafluoropropen.

Process for the joint preparation of 1, 3, 3, 3-tetrafluoropropene and 2, 3, 3, 3-tetrafluoropropene

Disclosed is a process for the preparation of 2,3,3,3-tetrafluoropropene, comprising the following two reaction steps: a. a compound having the formula CFClCFClCHCl undergoes gas-phase fluorination with hydrogen fluoride through n serially-connected reaction vessels in the presence of a compound catalyst, producing 2,3-dichloro-1,1,1,2-tetrafluoropropane, 1,2,3-trichloro-1,1,2-trifluoropropane, and 1,3-dichloro-1,1,2,2-tetrafluoropropane; in said formula, x=1, 2, 3, y=1, 2, and 3&#x2266;x+y&#x2266;5; b. the 2,3-dichloro-1,1,1,2-tetrafluoropropane, 1,2,3-trichloro-1,1,2-trifluoropropane, and 1,3-dichloro-1,1,2,2-tetrafluoropropane undergo gas-phase dehalogenation with hydrogen in the presence of a dehalogenation catalyst, producing 2,3,3,3-tetrafluoropropene and 3-chloro-2,3,3-trifluoropropene, then separation and refining are performed, producing 2,3,3,3-tetrafluoropropene. The present invention is primarily used to produce 2,3,3,3-tetrafluoropropene.

Process for the preparation of 2, 3, 3, 3-tetrafluoropropene

Disclosed in the present invention is a chromium-free catalyst for gas-phase fluorination and an application thereof. The precursor of the related chromium-free catalyst for gas-phase fluorination consists of a compound containing iron element, a compound containing rare earth metal element and a compound containing element A, wherein element A is one selected from Ca, Al, Mg and Ti, the precursor is subjected to calcination and fluorination treatment to obtain the chromium-free catalyst for gas-phase fluorination. The precursor of the catalyst is calcined at 400-500&#xb0; C. and fluorinated with hydrogen fluoride at 350-450&#xb0; C. to obtain the chromium-free fluorinated catalyst. The catalyst has characteristics of being chromium-free and environment-friendly, good catalytic activity and long life etc. The catalyst can be used for preparing hydrofluoroolefins or hydrochlorofluoroolefins from halohydrocarbons.

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Xi'an, China

Wei Zhang