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纳米技术在中药传递系统和分析中的应用

畜牧与兽医 2024年第4期56卷 125-131页

作者：于亚行李成哲孙婷庭陈冬梅谢书宇华中农业大学国家兽药残留基准实验室/华中农业大学国家兽药安全评价实验室湖北武汉430070

纳米技术与传统中医药的结合拓宽了中药的应用范围,使中药又一次焕发光彩。纳米中药以其粒径、形态、材料等特殊性,持续为中药研究赋能,使其具有长效、靶向、低毒等优点。纳米技术同样应用于中药提取分离与检测中,提升检测灵敏度、缩短... 详细信息

纳米技术与传统中医药的结合拓宽了中药的应用范围,使中药又一次焕发光彩。纳米中药以其粒径、形态、材料等特殊性,持续为中药研究赋能,使其具有长效、靶向、低毒等优点。纳米技术同样应用于中药提取分离与检测中,提升检测灵敏度、缩短检测时间。本文阐述了纳米中药的类型及其在缓释与靶向方面的应用进展,介绍了纳米材料的介入引起中药分析方法的变化,分析了纳米技术在改善中药性能过程中面临的问题,对解决问题的方法和未来的研究方向进行讨论和展望,希望为中药现代化发展和应用提供参考。

关键词：纳米中药递药系统中药现代化检测提取分离

A review on recent progress of non-stoichiometric SiOx anodes based on lithium ion batteries

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Progress in Natural Science:Materials International 2023年第1期33卷 47-54页

作者： Gengchen Yu Jiayi Jing chengzhe li Qian li Zhikai Yang Shuyu Yao Tao li Xue Bai School of Materials Science and Engineering Shandong University of Science and Technology Key Laboratory for liquid–Solid Structural Evolution & Processing of Materials(Ministry of Education) Shandong University

SiOxanode has attracted more and more attention due to its rich reserves and high theoretical capacity. However,the disadvantages of low initial Coulombic efficiency and large volume change limit its application. Therefore in this review, the research progress of SiOxanode will be summarized in detailed to demonstrate the various strategies adopted by researchers. Systematically introduction of the progress on preparation methods and modification strategies would be discussed, and the merits and challenges of various approaches will be highlighted as well, which provides valuable insights into the rational design and development of techniques to deal with the promising practical application of SiOxanode.

关键词： lithium ion batteries SiO x anode Preparation methods Modification strategies

Influence of nano-mechanical evolution of Ti_(3)AlC_(2) ceramic on the arc erosion resistance of Ag-based composite electrical contact material

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Journal of Advanced Ceramics 2024年第2期13卷 176-188页

作者： Xuelian Wu chengzhe Wu Xinpeng Wei Wanjie Sun Chengjian Ma Yundeng Zhang Gege li liming Chen Dandan Wang Peigen Zhang Zhengming Sun Jianxiang Ding School of Materials Science and Engineering Anhui University of TechnologyMa’anshan 243032China Analytical and Testing Center Yancheng Institute of TechnologyYancheng 224051China School of Materials Science and Engineering Changzhou UniversityChangzhou 213164China Jiangsu Key Laboratory of Advanced Metallic Materials School of Materials Science and EngineeringSoutheast UniversityNanjing 211189China

Al-containing MAX phase ceramic has demonstrated great potential in the field of high-performance low-voltage electrical contact *** the anti-arc erosion mechanism of the MAX phase is crucial for further improving performance,but it is not *** this study,Ag/Ti_(3)AlC_(2) electrical contact material was synthesized by powder metallurgy and examined by nanoindentation techniques such as constant loading rate indentation,creep testing,and continuous stiffness *** results indicated a gradual degradation in the nano-mechanical properties of the Ti_(3)AlC_(2) reinforcing phase with increasing arc erosion times,although the rate of this degradation appeared to decelerate over arc erosion ***,continuous stiffness measurements highlighted the uneven mechanical properties within Ti_(3)AlC_(2),attributing this heterogeneity to the phase’s *** the early(1-100 times)and intermediate(100-1000 times)stages of arc erosion,the decline in the nano-mechanical properties of Ti_(3)AlC_(2) was primarily ascribed to the decomposition of Ti_(3)AlC_(2) and limited surface *** the later stage of arc erosion(1000-6200 times),the inner region of Ti_(3)AlC_(2) also sustained arc damage,but a thick oxide layer formed on its surface,enhancing the mechanical properties and overall arc erosion resistance of the Ag/Ti_(3)AlC_(2).

关键词： MAX phase nano-mechanical properties decomposition surface oxidation anti-arc erosion mechanism

农民非农就业与农民家庭旅游消费支出——基于中国家庭追踪调查2012—2014数据的实证分析

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旅游科学 2021年第3期35卷 62-78页

作者：郭为王静李承哲青岛大学旅游与地理科学学院山东青岛266071

在经济不景气的情况下,如何促进国内旅游消费以推动旅游业复苏是一个亟须考虑的问题。文章利用中国家庭追踪调查2012—2014(CFPS 2012—2014)数据,研究了农村家庭非农就业对家庭旅游消费支出的影响。文章首先通过T检验确认了农村非农就... 详细信息

在经济不景气的情况下,如何促进国内旅游消费以推动旅游业复苏是一个亟须考虑的问题。文章利用中国家庭追踪调查2012—2014(CFPS 2012—2014)数据,研究了农村家庭非农就业对家庭旅游消费支出的影响。文章首先通过T检验确认了农村非农就业家庭与务农家庭在旅游消费支出上的显著差异,随后通过PSM方法检验了非农就业对旅游消费支出的“净影响”,最后利用回归模型检验了非农就业影响旅游消费支出的机制和非农就业影响旅游消费的异质性。文章得出了4个有意义的结论:(1)农民非农就业显著提高了家庭旅游消费支出;(2)非农就业影响家庭旅游消费支出的机制来源于非农就业产生的收入效应、示范效应和预期效应;(3)三类效应中,预期效应最强,示范效应其次,收入效应最弱;(4)非农就业的影响存在差异,私营企业(个体工商/自雇)与受雇旅游支出具有显著影响,而农业打工和非农散工则影响不显著。文章最后根据这些结论给出相应的政策建议。

关键词：非农就业旅游消费支出农民追踪调查实证分析

“宇宙热重子探寻计划”任务中绝热去磁制冷机

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Science Bulletin 2023年第22期68卷 2709-2711,M0004页

作者：姜春阳李成哲金海崔伟 Department of Astronomy Tsinghua UniversityBeijing 100084China

“宇宙热重子探寻计划”(HUBS)是一项由中国主导的空间X射线天文望远镜项目.该项目将采用超导转变边缘微量能器对宇宙中弥漫热气体(约百万开尔文)发出的X射线进行高能量分辨率探测,以期解决“宇宙热重子缺失问题”.HUBS的探测器工作在10... 详细信息

“宇宙热重子探寻计划”(HUBS)是一项由中国主导的空间X射线天文望远镜项目.该项目将采用超导转变边缘微量能器对宇宙中弥漫热气体(约百万开尔文)发出的X射线进行高能量分辨率探测,以期解决“宇宙热重子缺失问题”.HUBS的探测器工作在100 mK以下,这需要绝热去磁制冷机(ADR)来实现.本文展示了ADR最新进展.研究人员搭建了一台紧凑的两级绝热去磁制冷机,分别采用钆镓石榴石(GGG)和铬明矾(CPA)盐丸作为预冷级和最冷级的制冷工质.CPA性能决定了制冷机的性能,为此,该团队研发了一套生长高质量CPA的流程.采用这一流程生长的CPA,其制冷机达到了约44 mK的最低温度.该制冷机可以在100 mK维持约3 h,此时相对卡诺效率高达95%.进一步的数据分析表明,100 mK时的总热载约为6μW,作者认为这主要是由热开关所致,未来仍具很大优化空间.

关键词：制冷工质开尔文卡诺效率制冷机超导转变热开关数据分析 X射线

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旅游的缘起：融合分子生物视角的思考

旅游学刊 2019年第11期34卷 136-146页

作者：李承哲郭为李玉顺青岛大学旅游与地理科学学院山东青岛266071 日本北里大学理学研究科东京108-8641

旅游起源是旅游研究领域重要基础命题之一。分子生物领域同源性分析是呈现生物体性状"亲疏"程度及性状"传承"关系的重要途径。形态相似性以及微观分子序列比对是识别同源性状的重要分析方法。文章对远古迁徙与现代旅游的能动性、空间位... 详细信息

旅游起源是旅游研究领域重要基础命题之一。分子生物领域同源性分析是呈现生物体性状"亲疏"程度及性状"传承"关系的重要途径。形态相似性以及微观分子序列比对是识别同源性状的重要分析方法。文章对远古迁徙与现代旅游的能动性、空间位移和体验结果的形态相似性进行比对,并分析DRD4基因对两性状共通的作用机制后认为,两性状具有同源性特征。基因仅是行为的反应规范,生存环境变迁是行为性状得以衍生的重要原因。人类从迁移转向定居使人类社会化程度得到显著提升。随着社会化程度的提升,远古迁徙在当前环境中衍生出更"高级"的旅游行为。因此,该研究在以往的旅游起源研究基础上,重构了"远古迁徙-定居-现代旅游"的逻辑框架,得出"旅游是人类定居后基因与环境共同作用的一种现代表征,迁徙则是远古表征"的研究猜想。融合分子生物领域相关研究思想探索人类旅游,很好地补充了以往的旅游研究范式,能够对旅游基础理论的夯实起到积极促进作用。

关键词：基因环境变迁迁徙定居旅游行为

Additives strategies to improving cycling stability of li metal batteries by modifying electrode electrolyte interphases

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Progress in Natural Science:Materials International 2024年第2期34卷 338-344页

作者： Yuan li Pengfei Huang Chunyu Cui Xiaoyuan Ma li Chen Zekun li linhai li Yuhong Tian School of Biological and Chemical Engineering Guangxi University of Science and Technology School of College of Chemistry and Chemical Engineering Hunan University Isky Future Energy Institute

li metal batteries（LMBs） have attracted much attention due to the ultra-high theoretical capacity of the li metal anode（LMA）.However,the uncontrollable dendrites growth and low coulombic efficiency hinder their practical ***,we explore 3,5-difluoropyridine（2F-BD） as a novel electrolyte additive to enable highperformance *** 2F-BD additive participates in and modifies the solvation structure of li ions by reducing the coordinated number of PF6-at the electrode surface,leading to the formation of a liF and li3N-rich solid electrolyte interphase（SEI）.The liF component increases the robustness of SEI and suppresses the formation of li dendrites,while the li3N component facilitates the transportation and reaction kinetics of li *** a result,the li‖li symmetric cell presents a stable cycling performance of up to 500 h at a current density of 1 mA *** coupling with liFePO4cathode,the obtained full cell achieves high specific capacities of 106.06 mA h g-1and 84.98 mA h g-1at 2.55 mA cm-2and 5.10 mA cm-2,respectively,and maintains a high capacity retention of84.0% after 1000 cycles at 0.13 mA cm-2,with an average cycling CE of 99.58%.

关键词： Electrolyte additive li dendrites li metal batteries liF and li3N-Rich electrode-electrolyte interphase liFePO4 cathode

DRD4基因多态性与旅游行为关联性初探--以旅游“探求新奇”动机研究为桥梁的理论构建及研究方法探析

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旅游学刊 2017年第11期32卷 116-126页

作者：李承哲李想李玉顺郭为高洁青岛大学旅游与地理科学学院山东青岛266071 美国天普大学旅游与酒店管理系宾夕法尼亚州费城19122 日本北里大学东京108-8641

现实中,"条件满足"不出游或"条件不满足"出游的现象时有发生,这显然违背了"条件满足就会出游"的旅游研究基本假设。如果现有研究范式不能合理解释这一现象,那么,就需要寻找其他合理解释途径。生物学意义上,行为差异可以通过生物属性进... 详细信息

现实中,"条件满足"不出游或"条件不满足"出游的现象时有发生,这显然违背了"条件满足就会出游"的旅游研究基本假设。如果现有研究范式不能合理解释这一现象,那么,就需要寻找其他合理解释途径。生物学意义上,行为差异可以通过生物属性进行合理解释,因此,以基因科学、神经科学为代表的"生物社会科学"研究体系,也许可以为上述现象创造新的解释体系。分子遗传学研究认为,DRD4基因多态性与"探求新奇"性状存在显著相关,"探求新奇"是诸多行为的内在成因;旅游研究表明,"探求新奇"动机是旅游行为发生的重要解释变量。首先,以上述成果为依据,构建以"探求新奇"动机研究为桥梁的"出游行为与DRD4基因多态性关联"理论框架;其次,基于遗传学检测技术、实验设计与分析方法,探索了适用于旅游行为研究领域的研究方法。少量数据检验支持了本研究理论框架构建方向,也为将相关遗传学研究方法应用于旅游行为研究做出了有益的尝试。

关键词：旅游动机探求新奇 DRD4基因多态性遗传研究

Leaching kinetics of fluorine during the aluminum removal from spent li-ion battery cathode materials

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Journal of Environmental Sciences 2024年第4期138卷 312-325页

作者： Shengjie li Jianxin Zhu Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

The high content of aluminum(Al)impurity in the recycled cathode powder seriously affects the extraction efficiency of Nickel,Cobalt,Manganese,and lithium resources and the actual commercial value of recycled materials,so Al removal is crucially important to conform to the industrial standard of spent li-ion battery cathode *** this work,we systematically investigated the leaching process and optimum conditions associated with Al removal from the cathode powder materials collected in a wet cathode-powder peeling and recycling production line of spent li-ion batteries(liBs).Moreover,we specifically studied the leaching of fluorine(F)synergistically happened along with the removal process of Al,which was not concerned about in other studies,but one of the key factors affecting pollution prevention in the recovery *** mechanism of the whole process including the leaching of Al and F from the cathode powder was indicated by using NMR,FTIR,and XPS,and a defluoridation process was preliminarily investigated in this *** leaching kinetics of Al could be successfully described by the shrinking core model,controlled by the diffusion process and the activation energy was 11.14 kJ/***,the leaching of F was attributed to the dissolution of liPF6and decomposition of PVDF,and the kinetics associated was described by Avrami *** interaction of Al and F is advantageous to realize the defluoridation to some *** is expected that our investigation will provide theoretical support for the large-scale recycling of spent liBs.

关键词： Al removal F leaching Cathode powder Heating alkali leaching Leaching kinetics