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Calibration and experimental verification of discrete element parameters of Panax notoginseng root

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International Journal of Agricultural and Biological Engineering 2024年第4期17卷 13-23页

作者： Kaiting Xie zhaoguo zhang Fa’an Wang Xiaolan Yu Chenglin Wang Shifei Jiang Faculty of Mechanical and Electrical Engineering Kunming University of Science and TechnologyKunming 650500China Faculty of Modern Agricultural Engineering Kunming University of Science and TechnologyKunming 650500China Guizhou Agricultural Machinery Technology Promotion Station Guiyang 550003China Yunnan Tobacco Machinery Co. LtdKunming 650100China

Existing discrete element method-based simulation analysis of Panax notoginseng root soil separation still has the challenge to get the accurate and reliable basic parameters,which are necessary for discrete element *** this paper,the *** roots suitable for harvesting period were taken as the experimental *** using 3D scanning reverse modeling technology and EDEM software to establish the discrete element model of ***,based on which,the physical and virtual tests were carried out to calibrate the simulation ***,the basic physical parameters(density,triaxial geometric size,moisture content,shear modulus,and elastic modulus)and contact coefficients(static friction coefficient,rolling friction coefficient,and crash recovery coefficient between *** roots and 65Mn steel)were measured by physical ***,treating the contact coefficients of *** roots as the influence factor,the steepest uphill test,and four factors combing five levels of rotational virtual simulation are *** measured relative error accumulation angle and simulation accumulation angle are set as the performance *** results show that the static friction coefficient,rolling friction coefficient,crash recovery coefficient,and surface energy coefficient of *** roots are 0.55,0.35,0.16,and 19.5 J/m2,*** calibration results as parameters of the vibration separation simulation test of *** soil,the Box-Behnken vibration separation simulation tests were carried out,in which the vibration frequency,inclination angle,and vibration amplitude of separation device as factors,screening rate and damage rate of *** soil complex are regarded as *** results show that the optimal operating parameters of the separation device are the vibration frequency of 10 Hz,the inclination angle of 5°,and the amplitude of 6 *** on the optimal operation parameters,the discrete element

关键词： Panax notoginseng root EDEM parameter calibration separation test

Visible-Light-Induced Radical Cascade Cyclization： Synthesis of（20S）-Camptothecin, SN-38 and Irinotecan

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Chinese Journal of Chemistry 2018年第11期36卷 1035-1040页

作者： Yao Yuan Wuheng Dong Xiaoshuang Gao Xiaomin Xie Dennis P. Curran zhaoguo zhang Shanghai Key Laboratory for Molecular Engineering Of Chiral Drugs School of Chemistry and Chemical Engineering Shanghai Jiao Tong Uni- versity 800 Dongchuan Road Shanghai 200240 China Department of Chemistry University of Pittsburgh Pittsburgh Pennsyl-vania PA 15260 USA

(20S)‐Camptothecin, irinotecan and SN‐38 were successfully synthesized by a photocatalyzed radical cascade cyclization from an N‐propargyl iodopyridinone and an arylisonitrile under visible light with a ruthenium catalyst. This synthetic method provided a useful entry into composing camptothecin family of antitumor agents in good yields under mild reaction conditions without the use of heavy metal reagents.

关键词： photocatalysis radicals camptothecin irinotecan SN‐38 ruthenium

Purification characteristics and parameters optimization of anthocyanin extracted from blueberry

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International Journal of Agricultural and Biological Engineering 2015年第2期8卷 135-144页

作者： Zheng Xianzhe zhang zhaoguo Jin Changjiang Mu Yanqiu Liu Chenghai Chen Zhiying Liu Haijun Lin Zhen College of Engineering Northeast Agricultural UniversityHarbin 150030China

To improve the yield and purity of anthocyanin extracted from blueberry,the characteristics and optimization for the separation and purification process of anthocyanin by AB-8 macroporous adsorbent resin was *** the absorption stage,the pH value has positive effect in ranges of 1.0-3.0 and the temperature rise has firstly negative then positive effect on adsorption rate of anthocyanin with adsorption *** the desorption stage,the ethanol concentration increase has firstly positive then steady effect and the temperature rise has positive and then negative effect on desorption rate of *** purification temperature may improve diffusion or induce degradation of ***-8 macroporous adsorbent resin is suitable to purify the anthocyanin from extract of powdered blueberries and the optimum parameters were obtained by using Design Expert software as adsorption time of 3 h,pH value of 1.0,adsorption temperature of 18℃ in absorption stage and desorption time of 30 min,ethanol concentration of 46.5%,desorption temperature of 22℃ in desorption stage with the highest absorption rate and desorption rate are 87.65% and 84.80%,respectively.

关键词： parameters optimization extraction purification adsorption desorption anthocyanin blueberry

Nickel-Catalyzed Regioselective Hydrosilylation of Conjugated Dienes

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Chinese Journal of Chemistry 2024年第1期42卷 13-19,I0004页

作者： Xiaoyu Wu Wei Liu Liqun Yang Yue Wang Tianwen Liu Yao Yuan Yan Lu zhaoguo zhang Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs School of Chemistry and Chemical EngineeringShanghai JiaoTong University800 Dongchuan RoadShanghai 200240China Joseph Black Building The University of EdinburghDavid Brewster RoadEdinburghEH9 3FJUK

With the increasing demand for homoallylic silanes and allylic silanes,the highly efficient and regioselective hydrosilylations of conjugated dienes are urgently ***,we developed a Ni-catalyzed regiodivergent hydrosilylation of aromatic conjugated dienes by adjusting the temperature and *** low temperature(-30℃),an eternal-ligand-free system(Ni/t-BuOk)can efficiently facilitate the 3,4-anti-Markovnikov hydrosilylation to provide homoallylic silanes via electrophilic activation process;under room temperature(25℃),a ligand-controlled system(Ni/t-BuOk/PPh3)can eventuate the 3,4-Markovnikov hydrosilylation to produce allylic silanes via Chalk-Harrod *** systems are compatible with various conjugated dienes and primary silanes in excellent yields andregioselectivities.

关键词： Nickel-catalyzed Regioselective hydrosilylation Conjugated dienes Electrophilic activation Homoallylic silanes

Preparation and evaluation of PEGylated phospholipid membrane coated layered double hydroxide nanoparticles

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Asian Journal of Pharmaceutical Sciences 2016年第3期11卷 396-403页

作者： Mina Yan zhaoguo zhang Shengmiao Cui Xuefei zhang Weijing Chu Ming Lei Ke Zeng Yunhui Liao Yihui Deng Chunshun Zhao School of Pharmacy Shenyang Pharmaceutical University School of Pharmaceutical Sciences Sun Yat-sen University Guangzhou Higher Education Mega Center Guangdong Pharmaceutical University Guangzhou Higher Education Mega Center

The aim of the present study was to develop layered double hydroxide(LDH) nanoparticles coated with PEGylated phospholipid membrane. By comparing the size distribution and zeta potential, the weight ratio of LDH to lipid materials which constitute the outside membrane was identified as 2:1. Transmission electron microscopy photographs confirmed the core-shell structure of PEGylated phospholipid membrane coated LDH(PEG-PLDH)nanoparticles, and cell cytotoxicity assay showed their good cell viability on Hela and BALB/C-3 T3 cells over the concentration range from 0.5 to 50 μg/mL.

关键词： In vitro evaluation Layered double hydroxides Phospholipid membrane Preparation Size distribution Zeta potential

Ru-catalyzed highly enantioselective hydrogenation of α-keto Weinreb amides

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Science China Chemistry 2013年第3期56卷 342-391页

作者： ZHAO MengMeng LI WanFang MA Xin FAN WeiZheng TAO XiaoMing LI XiaoMing XIE XiaoMin zhang zhaoguo School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai Institute of Organic Chemistry Chinese Academy of Sciences

Asymmetric hydrogenation of α-keto Weinreb amides has been realized with [Ru((S)-Sunphos)(benzene)Cl]Cl as the catalyst and CeCl 3·7H2O as the additive.A series of enantiopure α-hydroxy Weinreb amides(up to 97% ee) have been *** amount of CeCl3·7H2O is essential for the high reactivity and enantioselectivity and the ratio of CeCl3·7H2O to [Ru((S)-Sunphos)(benzene)Cl]Cl plays an important role in the hydrogenation reaction.

关键词： asymmetric hydrogenation α-keto Weinreb amides CeCl3·7H2O

Chemo-,Enantio-,and Diasteroselective Hydrogenation of Functionalized Carbonyl Groups

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Chemo-,Enantio-,and Diasteroselective Hydrogenation of Funct...

Ru（Ⅱ）-Catalyzed Conjugate Addition of Arylboronic Acids to α,β-Unsaturated Ketones under Neutral Conditions

手性中国2014学术研讨会

作者： zhaoguo zhang School of Chemistry and Chemical Engineering Shanghai Jiao Tong University

Asymmetric hydrogenation of carbonyls has become a routine method for building up chiral alcohol centers in organic *** more polyfunctionalized a ketone is,the more versatile the hydrogenation product will *** example,syn-3,5-dihydroxyhept-6-enoic acid is a key substructure in side chains for *** and its congeners contain a common C-C block derived from an enantiopure

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Ru（Ⅱ）-Catalyzed Conjugate Addition of Arylboronic Acids t...

Countermeasures and Prevention of Railway Traffic Accidents in the Early Days of the Founding of the People’s Republic of China

第十七届全国金属有机化学学术讨论会

作者： Lei zhang zhaoguo zhang School of Chemistry and Chemical Engineering and School of Pharmacy Shanghai Jiao Tong University School of Chemistry and Chemical Engineering and State Key Lab of Organometallic Chemistry Shanghai Institute of Organic Chemistry

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Journal of World Architecture 2019年第5期3卷 13-15页

作者： Qinghua Lu zhaoguo zhang Wei Zheng East China Jiaotong University Marxist College NanchangJiangxi330212China Hunan Railway Vocational and Technical College ZhuzhouHunan412000China

In the early days of the founding of the People’s Republic of China,in order to restore the national economy as soon as possible,the Communist Party of China carried out maintenance and repairs on the railways that caused serious damage to transportation tasks through war-torn smoke,and carried out large-scale railway ***,in the course of operation,railway safety accidents occur frequently due to outdated equipment,low quality of staff,lack of rules and regulations,vandalism,and various natural *** the face of severe conditions,the railway authorities summed up the accidents and learned the safety of the railways,so that the railway transportation industry,which started after the founding of the country,was gradually on the right track,and laid a solid foundation for the safe development of the railway industry.

关键词： The early days of the founding of the People’s Republic of China Railway accident Countermeasures Prevention