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Analysis and determination of diterpenoids in unprocessed and processed Euphorbia lathyris seeds by HPLC-ESI-MS

Journal of Pharmaceutical Analysis 2011年第3期1卷 197-202页

作者： Xiao-Rong Hou Lei-Lei Wan zha-jun zhan Cheng-Ping Li Wei-guang Shan College of Pharmacy School of Zhejiang University of Technology Hangzhou 310014 China College of Biology and Environment Engineering Zhejiang Shuren University Hangzhou 310015 China

Euphorbia lathyris （Caper spurge） is a toxic and potent Chinese materia medica （T/PCMM）. This study sought a method for identifying five diterpenoids （Euphorbia factors LI-L3, L7a, and Ls） with the spectra of UV and mass, quantifying three diterpenoids L1, L2, and L8 in crude extracts of unprocessed and processed E. lathyris seeds by liquid chromatography/ electrospray ionization mass spectrometry （LC-ESI-MS）. The analysis was achieved on an Agilent Eclipse XDB-C18 column （4.6 mm× 150mm i.d., 5 μm） with an isocratic elution with a mobile phase consisting of water and acetonitrile at a flow rate of 0.25 mL/min at column temperature of 30 ℃ and UV detection was set at 272 nm. An ESI source was used with a positive ionization mode. The calibration curve was linear in the ranges of 9.9-79 μg/mL for Euphorbia factor Lb 3.8-30.5μg/mL for Euphorbia factor L2, and 1.0-20.6 μg/mL for Euphorbia factor LB. The average recoveries （n=6） of three diterpenoids were 98.39%, 91.10% and 96.94%, respectively, with RSD of 2.5%, 2.4% and 2.1%, respectively. The contents of the three diterpenoids in processed E. lathyris seeds were 3.435, 1.367 and 0.286 mg/g, respectively, which decreased more sharply than those in unprocessed E. lathyris seeds which were 4.915, 1.944 and 0.425 mg/g, respectively. The method is simple, accurate, reliable and reproducible, and it can be applied to control the quality of unprocessed and processed E. lathyris seeds.

关键词： Toxic and potentChinese materia medica(T/PCMM) High-performanceliquid chromatography/electrospray ionizationmass spectrometry(HPLC-ESI-MS) Euphorbia lathyris Diterpenoids

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Detection of Claisen Rearrangement Occurring in Allyl Phenyl Ether by in situ gC/MS

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Chinese Chemical Letters 1998年第4期9卷 381-384页

作者： Jian jun zhaI Wei YINg Fan Zhi zha0 Yao Zu CHEN(National Laboratory of Applied Organic Chemistry at Lanzhou University, Lanzhou 730000) Natl. Lab. of Appl. Organ. Chemistry Lanzhou University Lanzhou 730000 China

We report here a new strategy for revealing the Claisen rearrangement of allyl phenyl ether occurring in the gas phase by in situ gC/MS technique. The Claisen rearrangement has been observed when allyl phenyl ether passed through the capillary column at certain temperatures. The relative proportion of rearrangement products is dependent on the temperature of the capillary column and the substituents on the phenyl ring.

关键词： in situ gC/MS allyl phenyl ether Claisen rearrangement

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针刺治疗对颈椎间盘突出症微创手术后疗效的影响

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中国疼痛医学杂志 2024年第6期30卷 424-431页

作者：查紫璐计忠伟万权胡佳琦张南南茹彬徐郎海许运蔡文君李顺浙江省人民医院(杭州医学院附属人民医院)疼痛科杭州310014

目的:探讨针刺治疗对颈椎间盘突出症(cervical disc herniation,CDH)微创手术(minimally invasive surgery,MIS)后疗效的影响。方法:回顾性分析2019年1月1日至2020年12月31日浙江省人民医院疼痛科住院行MIS的CDH病人。采用视觉模拟评分... 详细信息

目的:探讨针刺治疗对颈椎间盘突出症(cervical disc herniation,CDH)微创手术(minimally invasive surgery,MIS)后疗效的影响。方法:回顾性分析2019年1月1日至2020年12月31日浙江省人民医院疼痛科住院行MIS的CDH病人。采用视觉模拟评分法(visual analogue scale,VAS)评分、颈椎功能障碍指数(neck disability index,NDI)评分和改良MacNab标准分别评估术后1个月、6个月和1年的疼痛程度、颈椎功能和临床疗效。比较接受针刺治疗和未接受针刺治疗病人的临床特点。结果:211名病人被纳入队列,其中102人接受针刺治疗,未接受针刺治疗病人109例。针刺治疗的病人较未接受针刺治疗的病人术后1个月、6个月和1年的VAS和NDI评分更低(Pgistic回归显示,针刺治疗是MIS术后1年良好结果的独立因素(P<0.001,OR=9.282,95%CI:3.469-24.836)。结论:针刺治疗对MIS后CDH病人的临床结果有益,是MIS后CDH病人的一种有效的辅助治疗方法。

关键词：针刺治疗颈椎间盘突出症微创手术临床结果疼痛功能

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Enhanced thermal conductivity and dielectric properties in electrostatic self-assembly 3D pBN@nCNTs fillers loaded in epoxy resin composites

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Journal of Materiomics 2020年第4期6卷 751-759页

作者： Dong-Li zha.g Sheng-Nan Liu Hui-Wu Cai Qi-Kun Feng Shao-Long Zhong jun-Wei zha Zhi-Min Dang State key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijing100084China School of Chemistry and Chemical Engineering Xi’an University of Science and TechnologyXi’an710054China School of Chemistry and Biological Engineering University of Science and Technology BeijingBeijing100083China Center on Frontier Technologies for Advanced Power Transmission and Distribution Equipment School of Electrical EngineeringZhengzhou UniversityHenan450001China

High-performance epoxy(EP)composites with excellent thermal conductivity and dielectric properties have attracted increasing attention for effective thermal *** this work,three-dimensional(3D)structural functional fillers were prepared by an electrostatic self-assembly *** negatively charged carbon nanotubes(nCNTs)prepared by carboxylation on the surface of CNTs were attached to the positively charged boron nitride(pBN)to form the 3D pBN@nCNTs functional *** morphological characterizations of the formed 3D pBN@nCNTs fillers and epoxy composites were established,illustrating that nCNTs were linearly overlapped between the BN sheets,thus forming a 3D heat conduction network in the epoxy *** synergistic effect of pBN with nCNTs on the enhancement of thermal conductivity and dielectric properties of composites was systematically *** experimental results demonstrated that the thermal conductivity of pBN@nCNTs/EP composites could reach 1.986 W m1K1 with the loading of 50 wt%fillers at 10:1 mass ratio of pBN:nCNTs,which is 464%and 124%higher than that of pure EP and BN/EP,***,the dielectric permittivity was successfully increased to ***,the thermal stability of the composites was synchronously *** study provides a facile path to fabricate thermosetting polymer composites with high thermal conductivity and dielectric properties.

关键词： Thermal conductivity Dielectric permittivity Composites Electrostatic self-assembly

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Association of CD14/-260 polymorphism with gastric cancer risk in Highland Tibetans

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World Journal of gastroenterology 2014年第10期20卷 2688-2694页

作者： Kang Li Zeng Dan Xue-jun Hu Luo-Bu gesang Yong-ge Ze zha-Xi Bianba Cuo-Mu Ciren Yu-Qiang Nie Department of gastroenterology People’s Hospital of Tibet Autonomous Region Department of Oncology People’s Hospital of Tibet Autonomous Region Department of gastroenterology Guangzhou First People’s Hospital Guangzhou Medical University

AIM: To investigate the relationship between CD14-260 and -651 polymorphisms and the risk of developing gastric cancer.

关键词： CD14 Single nucleotide polymorphisms Cancer susceptibility gastric cancer Tibetans

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高导热聚酰亚胺电介质薄膜研究进展

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物理学报 2022年第23期71卷 155-172页

作者：查俊伟王帆北京科技大学化学与生物工程学院北京100083 北京科技大学北京材料基因工程高精尖创新中心北京100083

电子器件高度薄型化、多功能化和集成化的时代,不可避免地会导致复合材料内部的热量积累,严重影响设备的稳定运行和使用寿命,如何实现电介质材料快速且高效的导热散热已成为影响电子设备发展的关键问题.传统聚酰亚胺本征导热系数较低,... 详细信息

电子器件高度薄型化、多功能化和集成化的时代,不可避免地会导致复合材料内部的热量积累,严重影响设备的稳定运行和使用寿命,如何实现电介质材料快速且高效的导热散热已成为影响电子设备发展的关键问题.传统聚酰亚胺本征导热系数较低,限制了在电气设备与智能电网等领域中的应用,发展新型高导热聚酰亚胺电介质薄膜材料成为国内外研究重点.本文介绍了复合材料的热传导机制,概述了近年来导热聚酰亚胺薄膜的研究进展与发展现状,重点讨论了导热填料、界面相容、成型工艺对材料导热系数的影响,最后结合导热聚酰亚胺复合电介质材料未来发展的需要,对研究中存在的一些关键科学技术问题进行了总结与展望.

关键词：聚酰亚胺热导率导热填料复合材料

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In-Situ SRPES Study on the Band Alignment of (0001)CdS/CdTe Heterojunction

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Chinese Physics Letters 2012年第5期29卷 201-204页

作者： gAO jun-Ning JIE Wan-Qi YUAN Yan-Yan zha.gang-Qiang XU Ling-Yan WU Heng WANg Ya-Bin YU Hui ZHU jun-Fa State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072 National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029

The band alignment of a (0001)CdS/CdTe heterojunction is in situ studied by synchrotron radiation photoemission spectroscopy (SRPES).The heterojunction is formed through stepwise deposition of a CdTe film on a wurtzite (0001)CdS single crystalline substrate via molecular beam *** shows an upward band bending of 0.55 eV,the valence band offset △Ev is calculated to be 0.65 e V and the conduction band offset △ Ec is 0.31 *** interracial band alignment is sketched to display type-Ⅰ band alignment.

关键词： alignment sketch bending

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倾转式三旋翼无人飞行器抗扰非线性控制设计

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控制与决策 2018年第2期33卷 263-268页

作者：鲜斌查君浩天津大学电气自动化与信息工程学院天津300072

针对倾转式三旋翼无人飞行器姿态和高度系统存在未知扰动和模型参数不确定性的问题,提出一种连续的非线性自适应鲁棒控制方法.该方法基于浸入-不变集原理估计模型未知参数,采用一种连续的鲁棒控制算法抑制未知扰动和补偿估计偏差.利用Ly... 详细信息

针对倾转式三旋翼无人飞行器姿态和高度系统存在未知扰动和模型参数不确定性的问题,提出一种连续的非线性自适应鲁棒控制方法.该方法基于浸入-不变集原理估计模型未知参数,采用一种连续的鲁棒控制算法抑制未知扰动和补偿估计偏差.利用Lyapunov函数从理论上证明此方法能保证闭环系统的稳定性,并能实现飞行器姿态与高度控制误差的渐近收敛.最后通过实时实验结果验证所提出控制算法的有效性和鲁棒性.

关键词：倾转式三旋翼姿态控制高度控制浸入-不变集鲁棒控制

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Simulation and Experimental Analysis of Vortex Tube Using Steel Material

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Open Journal of Fluid Dynamics 2020年第3期10卷 151-163页

作者： Muhammad Bilal Yaolong Chen jun zha Naveed Ullah School of Mechanical Engineering Xi’an Jiaotong University Xi’an China State Key Laboratory for Manufacturing System Engineering Xi’an Jiaotong University Xi’an China

Experimental and computational fluid dynamics (CFD) are investigated through the vortex tube system. The benefit of vortex tube is a counter flow type tube, which has further designed and fabricated for investigation. The whole set up is consisting of a simple device that can separate a single stream of compressed air into two streams;one is at high temperature and the other is lower temperature following an inlet gas stream. The advantages of this tube are their compactness, safety, and low equipment cost mainly used in cooling and heating applications. This study addressed three-dimensional flows;the domain is using computational fluid dynamics (CFD) method and experimental approach to optimize the direction of RHVT. Through the CFD analysis, the best cold end diameter (dc), number of nozzles, and the best parameters for obtaining the highest hot gas temperature and lowest cold gas temperature were obtained and verified by experimental procedures.

关键词： Ranque-Hilsch Vortex Tube Design Analysis & Fabrication Experimental of Vortex Tube Steel Material

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A Research on Investment Casting Technology of Ti Alloys

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Journal of Materials Science & Technology 2000年第1期16卷 76-78页

作者： Huiguan WAN, Xiumei QI, Jing TIAN, Yuyong CHEN, Weiqiang zha and jun JIA (National Key Laboratory of Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China) National Key Laboratory of Precision Hot Processing of Metals Harbin Institute of Technology Harbin 150001 China

In this research, the materials and the compositions of the surface slurries were chosen by considering the characteristics of Ti investment casting. The effects of solid-liquid ratios on the properties of the slurry and the effects of baking temperatures on the flexural strength have also been investigated. Flawless shells having smooth inner surface were manufactured with proper technology. Ti and its alloys were melted and poured by water-cooled Cu crucible vacuum induction furnace. The qualities of the investment castings made accordingly were studied and analyzed.

关键词： In Ti A Research on Investment Casting Technology of Ti Alloys

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