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超高效液相色谱-串联质谱法测定白术中34种禁限用农药残留

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中国药师 2024年第7期27卷 1125-1133页

作者：王澄林徐荟博张学斌高海波李兆奎台州市食品药品检验研究院浙江台州317700

目的建立白术34种禁限用农药残留的超高效液相色谱-串联质谱(UPLC-MS/MS)检测方法,对21批市售白术进行检测,初步调查市售白术农药残留情况。方法样品用纯乙腈提取,提取液经Waters-HLB 3cc(60 mg)固相萃取柱净化后,采用Waters-C_(18)色... 详细信息

目的建立白术34种禁限用农药残留的超高效液相色谱-串联质谱(UPLC-MS/MS)检测方法,对21批市售白术进行检测,初步调查市售白术农药残留情况。方法样品用纯乙腈提取,提取液经Waters-HLB 3cc(60 mg)固相萃取柱净化后,采用Waters-C_(18)色谱柱分离,流动相为0.1%甲酸水(含10 mmol/L甲酸铵)-乙腈,梯度洗脱,根据保留时间在多反应监测正离子模式下,以外标法定量分析。结果各成分在各自质量浓度范围内线性关系良好,r均大于0.9980。检测限为0.8~4.0μg/kg,定量限为2.0~10.0μg/kg。平均回收率为74.1%~97.4%,RSD为0.6%~6.4%(n=9)。21批白术样品中共有13批样品检出7种农药残留。结论本方法操作简单、定量准确,具有较高的回收率和良好的重复性,适用于白术中禁限用农药多残留检测。

关键词：白术农药残留基质超高效液相色谱-串联质谱

等离子喷涂TiC-Graphite复合涂层摩擦磨损性能

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无机材料学报 2022年第6期37卷 643-650页

作者：洪督牛亚然李红钟鑫郑学斌中国科学院上海硅酸盐研究所上海200050 上海大学材料科学与工程学院上海200072

等离子喷涂TiC涂层具有良好的综合性能,在极端环境能起到较好的耐磨保护作用,而石墨是一种优异的自润滑材料。通过喷雾干燥与真空烧结技术制备不同石墨添加量(1.25%、2.5%、5%和10%,质量分数)的TiC-Graphite球形粉体,并采用大气等离子... 详细信息

等离子喷涂TiC涂层具有良好的综合性能,在极端环境能起到较好的耐磨保护作用,而石墨是一种优异的自润滑材料。通过喷雾干燥与真空烧结技术制备不同石墨添加量(1.25%、2.5%、5%和10%,质量分数)的TiC-Graphite球形粉体,并采用大气等离子喷涂技术制备TiC-Graphite复合涂层。对涂层的相组成、显微结构和力学性能进行了表征,并对涂层的摩擦磨损性能进行了比较研究。结果发现,TiC-Graphite涂层主要由TiC和石墨相组成。随石墨添加量增大,TiC-Graphite涂层截面微裂纹增多,表面粗糙度增大,硬度下降。石墨对TiC涂层在高载荷的磨损性能影响更显著。在50 N高载荷条件,随石墨添加量增大,TiC-Graphite涂层磨损率降低后急剧增大,而摩擦系数持续减小。当石墨添加量为2.5%时,涂层获得最低的磨损率为0.67×10^(−5) mm^(3)/(N·m),同时具有较低的摩擦系数(0.35),与不添加石墨的TiC涂层相比,分别降低了72.4%和27.8%。

关键词： TiC-Graphite复合涂层磨损性能大气等离子喷涂显微结构力学性能

不同因素对特哈杂交绵羊消化道线虫感染情况的影响

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中国畜牧兽医 2024年第7期51卷 3067-3076页

作者：王钰琪贺三刚梁龙海拉提·卡斯木焦文静岳晨冰韩冰宋雪彬阎晓菲新疆农业大学动物医学学院乌鲁木齐830052 新疆畜牧科学院生物技术研究所农业农村部草食家畜遗传育种与繁殖重点实验室新疆动物生物技术重点实验室乌鲁木齐830011 新疆农业大学动物科学学院乌鲁木齐830052 新疆维吾尔自治区地方国营伊犁种马场哈萨克羊种羊场昭苏835612 新疆农业大学生命科学学院新疆极端环境生物生态适应与进化重点实验室乌鲁木齐830052

【目的】研究季节、性别、组别和群别对特克塞尔和哈萨克(以下简称特哈)杂交绵羊中消化道线虫(gastrointestinal nematodes,GIN)感染强度、体重、红细胞比容和特异性抗体免疫球蛋白G(immunoglobulin G,IgG)含量的影响,为绵羊消化道线虫... 详细信息

【目的】研究季节、性别、组别和群别对特克塞尔和哈萨克(以下简称特哈)杂交绵羊中消化道线虫(gastrointestinal nematodes,GIN)感染强度、体重、红细胞比容和特异性抗体免疫球蛋白G(immunoglobulin G,IgG)含量的影响,为绵羊消化道线虫的防治和抗消化道线虫育种等方面的研究提供参考依据。【方法】采集特哈杂交绵羊直肠粪便及颈静脉血液,称量体重。用饱和盐水漂浮法对消化道线虫虫卵进行定性检测,运用改良的McMaster法进行消化道线虫虫卵计数,计算感染率和感染强度;使用兽用全自动血液细胞分析仪对血液进行红细胞比容检测;制备线虫L3期幼虫体细胞抗原,运用间接ELISA法测定绵羊血清中特异性抗体IgG含量。【结果】特哈杂交绵羊消化道线虫感染率较高,为94.44%,呈中度感染,鉴定出毛圆属线虫(Trichostrongylus spp.)、捻转血矛线虫(Haemonchus contortus)、奥斯特属线虫(Ostertagia spp.)、羊仰口线虫(Bumastomum trigonocephalum)、夏伯特属线虫(Chabertia spp.)、马歇尔属线虫(Marshallagia spp.)、细项属线虫(Nematodirus spp.)、食道口属线虫(Oesophagostomum spp.)和球鞘毛首线虫(Trichuris globuulosa)共9种消化道线虫。季节对绵羊消化道线虫感染强度和体重有显著影响(P2×哈绵羊体重显著高于F2和F2×F1绵羊(P1×F1绵羊体重显著高于F2×F1绵羊(P2×F2绵羊体重显著低于其余组别的绵羊(P1群绵羊消化道线虫感染强度显著高于2和3群(P2群(P0.05)。【结论】季节、性别、组别和群别对绵羊消化道线虫感染情况存在影响,可根据因素对感染情况的影响和各因素不同水平之间的差异对绵羊选择不同的防治措施,为抗消化道线虫育种策略提供理论依据。

关键词：特哈杂交绵羊消化道线虫感染率感染强度

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The Complement System in Liver Diseases

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Cellular & Molecular Immunology 2006年第5期3卷 333-340页

作者： xuebin Qin Bin Gao Laboratory for Translational Research Harvard Medical School Cambridge MA 02139 USA Section on Liver Biology Laboratory of Physiologic Studies National Institute on Alcohol Abuse and Alcoholism National Institutes of Health Bethesda MD 20892 USA Laboratory for Translational Research Harvard Medical School One Kendall Square Building 600 3rd Floor Cambridge MA 02139 USA.

The complement system plays an important role in mediating both acquired and innate responses to defend against microbial infection, and in disposing immunoglobins and apoptotic cells. The liver （mainly hepatocytes） is responsible for biosynthesis of about 80-90% of plasma complement components and expresses a variety of complement receptors. Recent evidence from several studies suggests that the complement system is also involved in the pathogenesis of a variety of liver disorders including liver injury and repair, fibrosis, viral hepatitis, alcoholic liver disease, and liver ischemia/reperfusion injury. In this review, we will discuss the potential role of the complement system in the pathogenesis of liver diseases. Cellular ＆ Molecular Immunology.

关键词： immunity complement liver disease

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某独居石优溶渣二段逆流浸出试验研究

湿法冶金 2024年第4期43卷 395-400页

作者：程浩苏学斌刘康刘忠臣王桂硕梁耕宇张承天黄永刘会武向秋林核工业北京化工冶金研究院北京101149 中国铀业有限公司北京100013

针对某独居石优溶渣,研究了采用一段常规浸出—二段逆流浸出工艺浸出铀、钍、稀土。考察了各因素对浸出效果的影响。结果表明:采用一段常规浸出法时,适宜条件下的铀、钍、稀土浸出率分别为98.66%、95.37%、64.23%;采用二段逆流浸出法时... 详细信息

针对某独居石优溶渣,研究了采用一段常规浸出—二段逆流浸出工艺浸出铀、钍、稀土。考察了各因素对浸出效果的影响。结果表明:采用一段常规浸出法时,适宜条件下的铀、钍、稀土浸出率分别为98.66%、95.37%、64.23%;采用二段逆流浸出法时,铀、钍、稀土浸出率均可提高0.5%~1.0%,浸出液余酸降低50%以上,矿浆固液分离性能得到了一定改善。

关键词：独居石优溶渣常规浸出二段逆流浸出铀钍稀土固液分离

Diurnal characteristics of geoelectric fields and their changes associated with the Alxa Zuoqi M_S5.8 earthquake on 15 April 2015(Inner Mongolia)

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earthquake Science 2018年第1期31卷 35-43页

作者： Qing Ye Ye Fan xuebin du Tengfa Cui Kechang Zhou Ramesh P.Singh china earthquake Network Center China Earthquake Administration lanzhou institute of seismology China Earthquake Administration institute of Geology China Earthquake Administration School of Life and Environmental Sciences Schmid College of Science and Technology Chapman University One University Drive

In china, efforts are being made to monitor geoelectric fields through a large network of stations deployed and managed by the china earthquake administration. The diurnal variations in the geoelectric field waveforms were similar in the quiet magnetic periods when K〈5 （generally, K〈3 indicates a quiet time）. The arrival time points of the maxima in the geoelectric field waveforms exhibited differences in local time related to geographic longitude. The amplitude of diurnal variation was several to 16.6 mV/km and decreased with increasing latitude. Further, the amplitude of diurnal variation, which was related to seasonal changes, was larger in summer and autumn than in spring and winter. The periods of diurnal changes during quiet days were 24, 12, 8, 6, 4 hours and several minutes over large areas. Finally, the observed diurnal variations in geoelectric field prior to the Alxa Zuoqi Ms5.8 earthquake on 15 April 2015 were studied, and pronounced changes in the spectral values of the geoelectric fields were found to be associated with the Alxa Zuoqi earthquake in Inner Mongolia.

关键词： Geoelectrical field Diurnal variation Period Alxa Zuoqi earthquake

MULTI-AXLE VEHICLE STABILITY BASED ON WHOLE VEHICLE MODEL

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Chinese Journal of Mechanical Engineering 2007年第5期20卷 87-91页

作者： ZHU xuebin GAO Feng Special Chassis Research Department Beijing Institute of Special Engineering Machinery Beijing 100076 China Department of Automobile Engineering Beihang University Beijing 100083 China

From the analysis of experiment data of the multi-axle vehicle chassis searching process, it is less accurate to predict multi-axle vehicle dynamic characteristic with simplified two-axle vehicle model. So it is important to find out a more effective modeling method in the study of multi-vehicle stability. In the development of heat transfer fluid（HTF） six-axle vehicle, a whole vehicle multi-body dynamic model is built through collaborate flowchart using Teamcenter Engineering, UG NX3 and ***. The modeling method of connected hydragas spring suspension is validated by running test results. Based on this whole vehicle model, a kinematical analysis of suspension is implemented to achieve optimized suspension geometry parameters according to the stable requirement. Then, different handling simulations are carried out with regard to various tire characteristics, driving con- figurations, and equipments. According to the evaluation of whole vehicle handling characteristic, some design rules are summarized to improve the stability of multi-axle vehicle.

关键词： Stability Multi-axle vehicle Whole vehicle model Connected hydragas spring

Wellbore leakage risk management in CO_(2) geological utilization and storage: A review

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Energy Reviews 2023年第4期2卷 35-48页

作者： xuebin Su Sinan Liu Liwei Zhang Guizhen Liu Yan Wang Manguang Gan Xiaochun Li china National Uranium Co. Ltd.Beijing100013China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China

CO_(2) geological utilization and storage(CGUS)is an important technology to achieve a deep cut of global CO_(2) ***_(2) leakage from the subsurface may impair the performance of CGUS projects,and the CO_(2) leakage through wellbores is the most common leakage *** paper proposes a workflow for wellbore CO_(2) leakage risk management,and the workflow consists of the following steps:i)leakage risk identification;ii)leakage risk evaluation;iii)leakage risk monitoring;iv)leakage *** approaches in each step of the workflow are systematically *** challenges of wellbore CO_(2) leakage risk management include:lack of effective detection and evaluation approaches to tackle the CO_(2) leakage risk induced by cement failure;lack of low-cost acid resistance alloys and CO_(2)-resistant cement;lack of automated monitoring systems that could enable automated shutdowns of the wellbore whenever certain warning criteria are met.

关键词： CO_(2)storage CGUS Wellbore leakage Risk evaluation Monitoring Cement degradation

Harnessing the HDAC–histone deacetylase enzymes,inhibitors and how these can be utilised in tissue engineering

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International Journal of Oral Science 2019年第2期11卷 79-89页

作者： Liam Lawlor xuebin B. Yang Department of Oral Biology University of LeedsWellcome Trust Brenner BuildingSt. James’s University HospitalLeeds LS9 7TFUK Doctoral Training Centre in Tissue Engineering and Regenerative Medicine Institute of Medical and Biological EngineeringSchool of Mechanical EngineeringUniversity of LeedsLeedsUK

There are large knowledge gaps regarding how to control stem cells growth and *** limitations of currently available technologies,such as growth factors and/or gene therapies has led to the search of *** explore here how a cell’s epigenome influences determination of cell type,and potential applications in tissue engineering.A prevalent epigenetic modification is the acetylation of DNA core histone *** levels heavily influence gene *** deacetylase (HDAC) enzymes can remove these acetyl groups,leading to the formation of a condensed and more transcriptionally silenced *** deacetylase inhibitors (HDACis) can inhibit these enzymes,resulting in the increased acetylation of histones,thereby affecting gene *** is strong evidence to suggest that HDACis can be utilised in stem cell therapies and tissue engineering,potentially providing novel tools to control stem cell *** review introduces the structure/function of HDAC enzymes and their links to different tissue types (specifically bone,cardiac,neural tissues),including the history,current status and future perspectives of using HDACis for stem cell research and tissue engineering,with particular attention paid to how different HDAC isoforms may be integral to this field.

关键词： HDAC can be cells gene has led DNA