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Forecast correct model of overpressure attenuation during gas explosion in excavation roadway

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Journal of Coal Science & Engineering(China) 2010年第3期16卷 267-271页

作者： YANG Ying-di ZHANG guo-shu chen Cai-yun Safety ＆ High Efficient Coal Mining Key Lab Co-constructed by Anhui Province with Ministry of Education College of Energy ＆ Safety Anhui University of Science ＆ Technology Huainan 232001 China

Through analyzing experimental data of gas explosions in excavation roadwaysand the forecast models of the literature, Found that there is no direct proportional linearcorrelation between overpressure and the square root of the accumulated volume of gas,the square root of the propagation distance multiplicative ***, attenuation speedof the forecast model calculation is faster than that of experimental *** on theoriginal forecast models and experimental data, deduced the relation of factors by introducinga correlation coefficient with concrete volume and distance, which had been verifiedby the roadway experiment *** results show that it is closer to the roadway experimentaldata and the overpressure amount increases first then decreases with thepropagation distance.

关键词： excavation roadway gas explosion overpressure amount forecast model

Catalyst-free formal[4+1]/[4+2]cyclization cascade sequence of isocyanides with two molecules of acylketene formed in situ from thermal-induced Wolff rearrangement of 2-diazo-1,3-diketones

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Science Bulletin 2020年第8期65卷 670-677,M0004页

作者： Jian Luo guo-shu chen shu-Jie chen Yun-Lin Liu School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou 510006Chino

An expedient and economic approach for constructing O,O,N-spiro compounds consisting of both a 1,3-oxazine and a furan ring through a catalyst-free formal[4+1]/[4+2]cycloaddition cascade sequence of isocyanides with two molecules of acylketene formed in situ through thermal-induced Wolff rearrangement of 2-diazo-1,3-diketones was *** reaction displayed good functional group tolerance and was compatible with different isocyanides and 2-diazo-1,***,preliminary asymmetric attempts of this reaction are made by utilizing optically pure isocyanides as inputs,and moderate diastereomeric induction was observed.

关键词： Catalyst-free Isocyanide Acylketene 2-Diazo-1,3-diketone Wolff rearrangement

Single-blockmeasurement for the cryogenic permanent magnet undulator sorting

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Radiation Detection Technology and Methods 2021年第1期5卷 83-89页

作者： Ling-Ling Gong Xiao-Yu Li Yu-Hui Li Ya-Jun Sun Hui-Hua Lu Ke-yun Gong Qing guo·shu-chen Sun Zhi-qiang Li Wan chen Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Purpose The magnet sorting is a standard step in the undulator fabrication *** shortest undulators period used in the High Energy Photon Source(HEPS)is only 12 *** the short period undulator,the sorting may be more important than the long-period ***,the Helmholtz measurement is used as the input for the *** is the averaged orthogonal magnetization of each *** order to investigate whether the Helmholtz coil measurement is enough for the sorting,a careful study has been *** Firstly,a magnetic camera was used to scan the 3D surface field of a ***,its field integral ismeasured by the stretched *** the measurement,the magnetwas placed at different *** results were checked to seewhether they are consistent with expected features supposing a homogeneous magnetized ***,the results measured by the Helmholtz coil and the stretched wire were *** The surface field scan demonstrates that the field over a magnet block is ***,the field integral measurement by the stretched wire also shows big difference when the different magnet sides toward *** comparison between the stretched wire and the Helmholtz coil measurement shows no *** The study presented in this paper reveals that the homogeneity of the magnetization is ***,the Helmholtz coil data are insufficient to the short-period undulators sorting.

关键词： Magnet sorting Undulator Stretched wire Helmholtz coil

Triplophysa xuanweiensis sp. nov., a new blind loach species from a cave in China(Teleostei:Cypriniformes:Nemacheilidae)

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Zoological Research 2022年第2期43卷 221-224页

作者： Zong-Min Lu Xue-Jian Li Wen-Jian Lu Jin-Qing Huang Tian-Ke Xu Gang Huang Fen-Qiong Qian Peng Yang shu-guo chen Wei-Ning Mao Ya-Hui Zhao Key Laboratory of Zoological Systematics and Evolution Institute of ZoologyChinese Academy of SciencesBeijing 100101China Qujing Aquaculture Station QujingYunnan 655099China Shanghai Universities Key Laboratory of Marine Animal Taxonomy and Evolution Shanghai Ocean UniversityShanghai 201306China Xuanwei Fisheries Management Station XuanweiYunnan 655499China School of Basic Medical Sciences Guilin Medical UniversityGuilinGuangxi 541001China

Triplophysa xuanweiensis ***.,a new blind loach species from the family Nemacheilidae,is described based on specimens collected from a subterranean river in Xuanwei City,Yunnan Province,*** new species can be distinguished from all known congeners by a combination of the following characters:eyes absent,dorsal-fin origin anterior to pelvic-fin origin,tip of pelvic fin reaching anus,dorsal fin with 7-8 branched rays,caudal fin forked with 16-18 branched rays,body scaleless and colorless,lateral line complete,and posterior chamber of air bladder well developed and connected to anterior chamber by long,slender tube.

关键词： blind bladder reaching

Enantioselective palladium-catalyzed allylic alkylation of indoles by a new class of chiral biquinolyl biphosphine ligand

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Enantioselective palladium-catalyzed allylic alkylation of i...

Synthesis of novel chiral biquinolyl biphosphine ligand and its application in Palladium-catalyzed asymmetric allylic allylations

中国化学会第九届全国有机化学学术会议

作者： Jin-Ping Lu Bin Xie guo-shu chen Yi-Xin chen School of Chemistry and Chemical Engineering Guangzhou University

A newly developed class of quinoline-based chiral biphosphine ligand, 6,6’-bis（diphenylphosphino）-5,5’- biquinoline（BIQAP） was synthesized via a simple two-step reactions using optically pure BIQOL as starting material and the stereochemical structure of（R）-BIQAP was determined by X-ray crystallography. The chiral BIQAP ligand was successfully applied in Pd-catalyzed asymmetric allylic alkylation of indoles and afforded the desired product in good yields and high enantioselectivities（up to 96% ee）.

关键词： chiral biphosphine ligands palladium asymmetric allylic allylation

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Synthesis of novel chiral biquinolyl biphosphine ligand and ...

Information Fusing Recognition of Traditional Chinese Medicine (TCM) Pulse State Based on Stochastic Fuzzy Neural Network

手性中国2014学术研讨会

作者： Bin Xie Rui Zhang Jin-ping Lu guo-shu chen Yi-Xin chen School of Chemistry and Chemical Engineering Guangzhou University

A novel chiral biphosphine ligands,6,6’-bis（diphenylphosphmo）-5,5’-biquinoline（BIQAP）was synthesized by two step reactions used optical pure BIQOL as starting material and the molecular structure of（R）-BIQAP has been determined by single-crystal X-ray diffractioa The ligand was utilized in Pd-catalysed asymmetric allylic *** enantioselectivety was obtained in C-C and C-N bond formation of l,3-diphenyl-2-propenyl acetate,with dimethyl malonate（up to 94.2%ee）and with aminations（up to 97.8%ee）.

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Chinese Journal of Biomedical Engineering(English Edition) 2005年第3期14卷 114-119页

作者： QIN Jian LIU Hong-jian DENG Wei WU guo-zhen chen shu-qing JING Ming-hua The first affiliated hospital Sun Yat-Sen University Guangzhou 510080 China

Based on the fuzzy characteristic of the pulse state and syndromes differentiation thinking mode of TCM, an information fusing recognition method of pulse states based on SFNN (Stochastic Fuzzy Neural Network) is presented in this paper. With the learning ability in parameters and structure, SFNN fuses the measurement information of three pulse-state sensors distributed in Cun, Guan, and Chi location of body for the pulse state recognition. The experimental results show that the percentage of correct recognition with new method is higher than that by single-data recognition one, with fewer off-line train numbers.

关键词： Stochastic fuzzy neural network Information fusing Pulse state recognition

The Interaction Between Pazufloxacin and Calf Thymus DNA Mediated by metal ions

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The Interaction Between Pazufloxacin and Calf Thymus DNA Med...

Microstructural evolution during the progressive transformation-induced plasticity effect in a Fe-0.1C-5Mnmedium manganese steel

中国化学会第四届有机化学学术会议

作者： Wang guo-Ping, chen shu-Yang Department of Chemistry, Zhejiang University, Hangzhou, 310027

＜正＞The nature and dynamics of binding drug molecules to nucleic acids represent an active area of investigation. The interest of this field is diverse, since metal ions are found to play an important role in the DNA and RNA structure, as well as in relation to the different process in which these macromolecules are involved . Quinolones are an important group of antibiotics and several quinolones are in common clinical use. The carboxylic acid at position 3 and the exocyclic oxygen at position 4 are believed to be the portion of the molecule that binds to the DNA gyrase of the

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 369-379页

作者： Mei Zhang Wenhao Li Yangfei chen Yang Jiang Xiaofei guo Han Dong School of Materials Science and Engineering Shanghai UniversityShanghai 200444China State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China

The microstructural evolution of a cold-rolled and intercritical annealed medium-Mn steel(Fe-0.10C-5Mn)was investigated during uniaxial tensile ***-situ observations under scanning electron microscopy,transmission electron microscopy,and X-ray diffraction analysis were conducted to characterize the progressive transformation-induced plasticity process and associated fracture initiation *** findings were discussed with the local strain measurements via digital image *** results indicated that Lüders band formation in the steel was limited to 1.5%strain,which was mainly due to the early-stage martensitic phase transformation of a very small amount of the less stable large-sized retained austenite(RA),which led to localized stress concentrations and strain hardening and further retardation of *** small-sized RA exhibited high stability and progressively transformed into martensite and contributed to a stably extended Portevin-Le Chatelier *** volume fraction of RA gradually decreased from 26.8%to 8.2%prior to *** the late deformation stage,fracture initiation primarily occurred at the austenite/martensite and ferrite/martensite interfaces and the ferrite phase.

关键词： medium-Mn steel retained austenite progressive transformation-induced plasticity effect local strain fracture initiation