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宫康中水苏碱含量测定

中兽医医药杂志 2016年第5期35卷 69-71页

作者：苗小楼尚小飞王东升潘虎王瑜李升桦中国农业科学院兰州畜牧与兽药研究所农业部兽用药物创制重点实验室甘肃省中兽药工程技术研究中心甘肃省新兽药工程重点实验室甘肃兰州730050 甘肃省通渭县农牧局畜牧中心甘肃通渭743300

目的:筛选宫康中水苏碱含量测定供试品溶液的制备方法,建立宫康中水苏碱HPLC-ELSD含量检测方法。方法:采用阳离子交换树脂、五氯酚、硫氰酸铬铵3种方法制备供试品溶液,采用HPLC-ELSD测定水苏碱含量。结果:采用硫氰酸铬铵制备的供试品溶... 详细信息

目的:筛选宫康中水苏碱含量测定供试品溶液的制备方法,建立宫康中水苏碱HPLC-ELSD含量检测方法。方法:采用阳离子交换树脂、五氯酚、硫氰酸铬铵3种方法制备供试品溶液,采用HPLC-ELSD测定水苏碱含量。结果:采用硫氰酸铬铵制备的供试品溶液较好,水苏碱含量在2.20-11.00μg范围内线性关系良好(R^2=0.999),平均回收率为95.96%。结论:该法简便、样品纯净,灵敏,阴性无干扰,可以有效控制该制剂质量。

关键词：子宫内膜炎宫康 HPLC-ELSD 水苏碱

Direct preparation of semi-solid billets by the semi-solid isothermal heat treatment for commercial cold-rolled ZL104 aluminum alloy

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International Journal of Minerals,Metallurgy and Materials 2021年第7期28卷 1164-1173页

作者： Yong-fei Wang Yi Guo sheng-dun Zhao xiao-guang Fan School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou310027China School of Energy and Power Engineering Xi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China

Semi-solid isothermal heat treatment was proposed to directly process cold-rolled ZL104 aluminum alloys and obtain semi-solid *** effects of two process parameters,namely,temperature and processing time,on the microstructure and hardness of the resulting bil-lets were also experimentally *** grain size(AGS)increased and the shape factor(SF)of the grain improved as the process temperature *** SF of the grain also increased with increasing processing time,and the AGS was augmented when the processing time was prolonged from 5 to 20 min at 570℃.The hardness of the aluminum alloy decreased because of the increase in AGS with increasing temperature and processing *** optimal temperature and time for the preparation of semi-solid ZL104 aluminum alloys were 570℃and 5 min,*** optimal process parameters,the AGS,SF,and hardness of the resulting alloy were 35.88μm,0.81,and 55.24 MPa,*** Lifshitz-Slyozov-Wagner relationship was analyzed to determine the coarsening rate constant at 570℃,and a rate constant of 1357.2μm3/s was obtained.

关键词： semi-solid aluminum alloy microstructure hardness semi-solid isothermal heat treatment

Biochemical Properties and Inhibition Kinetics of Phosphatase from Wheat Thylakoid Membranes

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Journal of Integrative Plant Biology 2006年第3期48卷 294-299页

作者： Mei-Juan fei Jian-sheng Chen xiao-Yun Wang College of Life Sciences Shandong Agricultural University Taian 271018 China Shandong Key Laboratory of Crop Biology Shandong Agricultural University Taian 271018 China

A phosphetase that hydrolyses phosphate monoesters has been Isolated from wheat thylakold membranes. Biochemical properties and inhibition kinetics of the phosphatase were Investigated using several Ions, organlc solvents, and Inhlbltors. Wheat （Trltlcum aestivum L. cv. PH82-2-2） thylakold membrane phosphatase activity was activated by Mg^2＋, Ca^2＋, and Fe^2＋ and was inhibited by Mn^2＋ and Cu^2＋. For example, enzyme activity was acUvated 34.81% by 2 mmol/l. Mg^2＋, but was Inhibited 22.3% and 8.5% by 2 and 1 mmol/L Cu^2＋, respectively. Methanol, ethanol and glycol were all able to activate enzyme activity. Enzyme activity was activated 58.5%, 48.2%, and 8.7% by 40% ethanol, methanol and glycol, respectively. From these results, It can be seen that the degree of actlvetlon of the phosphetase was greatest for ethanol and the type of acUvatlon was uncompetltlve. Moreover, the activity of the thylakold membrane phosphetase was Inhibited by molybdate, vanadete, phosphate, and fluoride and the type of Inhibition produced by these elements was uncompetltlve, non-competitive, competltlve and mixed, respectively.

关键词： calcium ions copper enzyme activity enzyme inhibitors enzymes ethanol ferric ions fluoride glycols ions kinetics magnesium manganese methanol molybdates phosphate phosphoric monoester hydrolases solvents thylakoids wh eat

A Novel Conceptual Telescopic Positioning Pile for VLFS Deployed in Shallow Water:Structure Design

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China Ocean Engineering 2020年第4期34卷 526-536页

作者： XU sheng-wen LIU xiao-lei WANG Xue-feng DENG Yan-fei State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration(CISSE) Shanghai 200240China School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China CIMC Offshore Co.Ltd Shenzhen 518000China

A conceptual design of using novel telescopic piles to position a multi-modular very large floating structure(VLFS),which is supposed to be severed as a movable floating airport,is *** telescopic piles can automatically plug in the soil to resist the environmental loads and pull out from the soil to evacuate or move on to the next operational *** feasibility demonstration of the conceptual design includes two parts:function verification and structure *** the latter part of the conceptual design,a time-domain structural analysis is firstly conducted by using Abaqus *** simulation results suggest that the preliminary structure scheme is not optimum due to the insufficient structure utilization,although both structure safety of the piles and positioning accuracy are *** realize a cost reduction of construction and installation,a Genetic Algorithm-Finite Element Analysis(GA-FEA)method is employed to perform structural *** optimization,31 percent of the weight of each pile is reduced and higher structure utilization is *** difference of the self-weight and allowable buoyancy of a single module(SMOD)of a semisubmersible-type VLFS is much larger than the weight of the *** with the function verification in our previous work,the conceptual design of using the novel telescopic pile to position VLFS is demonstrated to be feasible.

关键词： novel telescopic positioning pile feasibility demonstration structural optimization very large floating structure(VLFS)

Surface Polarization Effects on Collapse Transition of Polyelectrolyte Brushes

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Chinese Journal of Polymer Science 2024年第9期42卷 1313-1320,I0006页

作者： xiao-fei Xu State Key Laboratory of Chemical Engineering and School of Chemical Engineering East China University of Science and TechnologyShanghai200237China

Polyelectrolyte brushes(PEBs)are commonly used to modify surface that have attracted great research *** dielectric permittivity of the grafted surface is typically significantly different from that of solution,which results in surface polarization(SP)effect with a jump of electric *** is thus important to study how SP alters the PEB’s structure and *** this work,the SP effects on PEB structure was studied using a statistical thermodynamic *** free energy functional to describe SP effect was constructed by using the image-charge ***,the electrostatic potential was solved from a modified Poisson-Boltzmann equation taking the ion solvation effect into *** the absence of SP,the thickness of PEB exhibited a continuous collapse transition when decreasing the solvent *** the presence of SP,the collapse became a jump-like *** energy analysis showed that the long-range Coulombic interaction dominated the transition because of the enhanced counterion condensation in the presence of *** theory provides an effective tool to study SP effect on PEBs,and the results explain the underlying physics in PEB collapse transition.

关键词： Surface polarization Polyelectrolyte brush Image charge Ion solvation Polyelectrolyte collapse transition

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降低前照灯进水起雾故障率的方法研究

汽车电器 2019年第9期 52-53,56页

作者：朱礼铭肖飞胜晋蕾尹正梅米德旺奇瑞汽车股份有限公司

通过调研汽车行业的前照灯进水、起雾现状,以某车型为例,从人、机、料、法、环6个维度,从根本上分析前照灯进水起雾的原因,并制定相应的优化对策,成功降低该车型的进水起雾故障率。

关键词：前照灯进水起雾对策

Cu掺杂SnS_(2)纳米花高效电化学还原CO_(2)合成甲酸盐的研究

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现代化工 2025年第1期45卷 220-224页

作者：丁笑含赵林飞袁章福田越徐秉声北京科技大学钢铁共性技术协同创新中心北京100083 中国标准化研究院资源环境研究分院北京100191

为了提高Sn基材料表面CO_(2)电化学还原为甲酸盐的法拉第效率,利用一步溶剂热法合成了具有丰富硫空位的Cu掺杂SnS_(2)纳米花(Cu-SnS_(2-x))催化剂,在较宽的电位窗口实现了CO_(2)电化学还原制备甲酸盐。结果表明,通过调控催化剂制备过程... 详细信息

为了提高Sn基材料表面CO_(2)电化学还原为甲酸盐的法拉第效率,利用一步溶剂热法合成了具有丰富硫空位的Cu掺杂SnS_(2)纳米花(Cu-SnS_(2-x))催化剂,在较宽的电位窗口实现了CO_(2)电化学还原制备甲酸盐。结果表明,通过调控催化剂制备过程中Cu和Sn的摩尔比,在-1.1 V ***电位条件下得到了72.64%的FE_(formate),电流密度J_(formate)达到-14.38 mA/cm^(2)。二维纳米片阵列增加了催化活性位点,Cu掺杂所产生的硫空位能够协同提高催化活性、促进电子转移,从而提高甲酸盐的选择性。

关键词： CO_(2)还原电化学掺杂溶剂热甲酸

Inhibitory Effect of Progesterone on Inflammatory Factors After Experimental Traumatic Brain Injury

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Biomedical and Environmental Sciences 2007年第5期20卷 432-438页

作者： DE-sheng PAN WEI-GUO LIU xiao-FENG YANG AND fei CAO Department of Neurosurgery The First Affiliated Hospital Medical College of Zhejiang University Hangzhou 310003 Zhejiang China Department of Neurosurgery The Second Affiliated Hospital Medical College of Zhejiang University Hangzhou 310009 Zhejiang China

Objective Traumatic brain injury （TBI） is one of the leading causes of morbidity and mortality in young people. Inflammatory cytokines play an important part in the pathophysiology of TBI. Recent studies demonstrate that progesterone significantly reduces cerebral edema and enhances functional recovery from TBI and stroke in several animal models. This study was designed to investigate the inhibitory effect of progesterone on inflammatory response after traumatic brain injury. Methods Progesterone was injected intraperitoneally using rats as a model of traumatic brain injury, and Western blot technique was applied to detect the expression of three inflammation-related factors： nuclear factor kappa B p65 （NFκB p65）, glial fibrillary acidic protein （GFAP）, and tumor necrosis factor-α （TNF-α）. The water content of injured brain was also examined. A neurological severity score was recorded to evaluate the effect of progesterone on neurodeficit recovery. Results NFκB p65, GFAP, and TNF-α were increased in all injured animals. In rats treated with progesterone, the expression level of NFκB p65 and TNF-α were reduced significantly in comparison with vehicle-treated rats. However, progesterone did not alter the expression of GFAP in the injured rats. Progesterone also reduced the water content of injured brain and the lesion volume. In addition, progesterone-treated injured rats showed significant improvements in the Neurological Severity Score test, compared with vehicle-treated ones. Conclusions Progesterone inhibits the inflammatory response after experimental traumatic brain injury and mitigates the severity of brain damage.

关键词： Traumatic brain injury Progesterone Inflammation

Synthesis,Characterization of Polyethylene Ionomers and Their Antibacterial Properties

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Chinese Journal of Polymer Science 2024年第8期42卷 1077-1084页

作者： Jia-Jia Wu fei Wang Peng-Qi Wan Li Pan Chun-sheng xiao Zhe Ma Yue-sheng Li Tianjin Key Lab Composite&Functional Materials School of Materials Science and EngineeringTianjin UniversityTianjin 300350China Key Lab Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

Owing to its high production volume and wide range of application s,polyethylene has gained a great deal of attention,but its low surface energy and non-polar nature have limited its application in some important *** this study,ethylene/11-iodo-1-undecene copolymers were prepared and used as the intermediates to afford a series of imidazolium-based ionomers bearing methanesulfonate(CH_(3)SO_(3)^(-)),trifluoromethanesulfonate(CF_(3)SO_(3)^(-)),or bis(trifluoromethane)sulfonimide(Tf_(2)N^(-))*** tensile test results showed that the stress-at-break(7.8-25.6 MPa)and the elongation-at-break(445%-847%)of the ionomers could be adjusted by changing the counterion species and the ionic group *** importantly,the ionomers exhibited marvelous antibacterial activities against Staphylococcus aureus(***)and Escherichia coli(***).The ionomers bearing Tf_(2)N^(-)exhibited antibacterial activities>99%against both *** and *** when ionic content reached 9.1%.The imidazolium-based ionomers prepared in this work demonstrated excellent comprehensive properties,especially highefficient and broad-spectrum antibacterial ability,exhibiting the potential fo r the application as the antibacterial materials in packaging,medical,and other fields.

关键词： Polyethylene Ionomer Polymerization catalysis Imidazolium Antibacterial material