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MOFs基微流控电化学芯片对多种重金属离子的实时在线检测

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高等学校化学学报 2024年第2期45卷 25-34页

作者：陈晓萍王旭潭刘宁汪庆祥倪建聪杨伟强林振宇闽南师范大学化学化工与环境学院漳州363000 福建省现代分离分析科学与技术重点实验室污染监测与控制福建省高校重点实验室漳州363000 福州大学食品安全与生物分析教育部重点实验室福建省食品安全分析与检测技术重点实验室福州350108

将具有丰富微孔的ZIF-8金属有机框架和电化学技术对金属离子的富集作用与微流控器件对溶液流动的可控性相结合,构建了一种新型传感器,实现了高通量、实时和快速检测环境中的多种金属离子污染物.研制的ZIF-8-Nafion/ITO基微流控电化学传... 详细信息

将具有丰富微孔的ZIF-8金属有机框架和电化学技术对金属离子的富集作用与微流控器件对溶液流动的可控性相结合,构建了一种新型传感器,实现了高通量、实时和快速检测环境中的多种金属离子污染物.研制的ZIF-8-Nafion/ITO基微流控电化学传感器对Cd^(2+),Pb^(2+)及Hg^(2+)离子在0.1~100μmol/L的浓度范围内具有良好的线性关系,检出限分别为0.055,0.0025及0.0016μmol/L(S/N=3).该微流控芯片对于样品的需求量少,可降低对能源的消耗;同时由聚二甲基硅氧烷拓印的微流控器件还有望实现柔性电极的功能,对便携式电化学柔性器件在生物和环境样品的集成化和自动化检测具有重要意义.

关键词：微流控重金属检测电化学传感器金属有机框架

Dynamic change of Adamalysin 19 (ADAM19) in human placentas and its effects on cell invasion and adhesion in human trophoblastic cells

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Science China(Life Sciences) 2009年第8期52卷 710-718页

作者： SANG qingxiang Amy Department of Chemistry and Biochemistry and Institute of Molecular Biophysics Florida State University

Human ADAM19 is a recently identified member of the ADAM *** is highly expressed in human placentas,but its dynamic change and function at the human feto-maternal interface during placentation remain to be *** this present study,the spatial and temporal expression and cellular localization of ADAM19 in normal human placentas were first demonstrated,and the effects of ADAM19 on trophoblast cell adhesion and invasion were further investigated by using a human choriocarcinoma cell line(JEG-3) as an in vitro *** data demonstrated that ADAM19 was widely distributed in villous cytotrophoblast cells,syncytiotrophoblast cells,column trophoblasts,and villous capillary endothelial cells during early *** mRNA and protein level of ADAM19 in placentas was high at gestational weeks 8-9,but diminished significantly at mid-and term *** JEG-3 cells,the overexpression of ADAM19 led to diminished cell invasion,as well as increases in cell adhesiveness and the expression of E-cadherin,with no changes in β-catenin expression *** data indicate that ADAM19 may participate in the coordinated regulation of human trophoblast cell behaviors during the process of placentation.

关键词： ADAM19 human trophoblast cells invasion adhesion

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马克思恩格斯技术异化思想及其当代启示

湖南大学学报（社会科学版） 2024年第2期38卷 9-15页

作者：冯庆想中山大学马克思主义学院广东广州510275

马克思恩格斯著作蕴含丰富的技术异化思想,深刻揭示了技术异化的内涵、表征、根源和扬弃路径。他们以大工业的机器应用为批判靶点,坚持自然和历史相统一,将技术批判与社会批判有机结合,形成严谨缜密的逻辑理路,展现了对技术批判的彻底... 详细信息

马克思恩格斯著作蕴含丰富的技术异化思想,深刻揭示了技术异化的内涵、表征、根源和扬弃路径。他们以大工业的机器应用为批判靶点,坚持自然和历史相统一,将技术批判与社会批判有机结合,形成严谨缜密的逻辑理路,展现了对技术批判的彻底性。在当代,马克思恩格斯技术异化思想的世界观和方法论依然适用,我们在充分发挥技术转化生产力的杠杆作用的同时,也要着力纾解技术异化带来的负向效应。通过激发社会主义制度的优势对资本逻辑进行扬弃,基于人与自然和谐共生的理念为人工自然观提供引导,以人的自由全面发展的目标促进技术劳动的解放,从而使得技术文明的进步更好地服务人类共同福祉。

关键词：马克思恩格斯技术异化资本人工自然观

左侧三叉神经第三支带状疱疹并发左侧下颌骨骨坏死1例

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北京大学学报（医学版） 2024年第2期56卷 366-370页

作者：周颖赵宁黄竑远李庆祥郭传瑸郭玉兴北京大学口腔医学院·口腔医院口腔颌面外科国家口腔医学中心国家口腔疾病临床医学研究中心口腔生物材料和数字诊疗装备国家工程研究中心北京100081

带状疱疹是由长期潜伏在脊髓后根神经节或颅脑神经节内的水痘-带状疱疹病毒重新激活和复制而引起的感染性皮肤病[1]。研究表明水痘-带状疱疹病毒被重新激活的因素包括:感冒、疲劳过度、感染、创伤、免疫功能下降等[2]。我国50岁以上人... 详细信息

带状疱疹是由长期潜伏在脊髓后根神经节或颅脑神经节内的水痘-带状疱疹病毒重新激活和复制而引起的感染性皮肤病[1]。研究表明水痘-带状疱疹病毒被重新激活的因素包括:感冒、疲劳过度、感染、创伤、免疫功能下降等[2]。我国50岁以上人群带状疱疹的发病率为(2.9~5.8)/千人年,约有10%~15%的带状疱疹累及三叉神经,其中第一支(眼支)最常受累,而第三支(下颌支)相对较少[3-5]。

关键词：三叉神经带状疱疹骨坏死

浅埋近距离煤层工作面过三角形斜交煤柱开采应力演化规律研究

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采矿与安全工程学报 2024年第2期41卷 285-294页

作者：王庆雄黄庆享范东林贺雁鹏陈苏社王伦言黄涛国能神东煤炭集团有限责任公司陕西神木719315 西安科技大学能源学院教育部西部矿井开采及灾害防治重点实验室陕西西安710054 国能神东煤炭集团有限责任公司寸草塔二矿内蒙古鄂尔多斯017209

针对浅埋近距离煤层工作面过上覆三角形遗留煤柱开采,存在顶板局部来压强烈和区段煤柱应力集中导致的巷道大变形等问题,以寸草塔二矿31109工作面为研究背景,采用现场实测、数值计算和理论分析相结合的方法,研究过三角形煤柱两次采动叠... 详细信息

针对浅埋近距离煤层工作面过上覆三角形遗留煤柱开采,存在顶板局部来压强烈和区段煤柱应力集中导致的巷道大变形等问题,以寸草塔二矿31109工作面为研究背景,采用现场实测、数值计算和理论分析相结合的方法,研究过三角形煤柱两次采动叠加应力的大小和范围的演化规律,揭示两次采动区段煤柱压力变化规律和相邻巷道破坏机理,明确巷道加强支护的范围和重点支护范围与时机。研究结果表明:上覆三角形斜交煤柱对其下方工作面煤层形成应力集中,最大应力位置位于斜交区段煤柱之下;当下煤层31206工作面开采后,31109区段煤柱应力上升为最大应力,应力峰值区位于与上覆斜交区段煤柱叠合区附近,峰值区宽度为240 m,对应该区域巷道变形破坏较明显。31109工作面开采过程中,在工作面煤壁与上覆斜交煤柱叠加区和工作面区段煤柱与上覆斜交煤柱叠加区存在应力峰值区,形成应力双峰;随着工作面推进,双峰应力不断升高,且煤壁应力峰值区逐步向区段煤柱方向移动,当工作面推进到区段煤柱叠加区时,双峰合并为更高的单峰应力;在工作面出斜交煤柱时区段煤柱应力达到最大,出煤柱叠加区后应力迅速减小;总体上,31109工作面开采后区段煤柱应力峰值区最大应力高56%,峰值区范围扩大50%。区段煤柱应力升高的机理是随着工作面的推进,上覆三角形斜交煤柱尺寸不断减小,应力集中程度不断提高;当工作面推进到三角形煤柱端区时,斜交煤柱应力、工作面超前支承压力、区段煤柱应力相互叠合,形成区段煤柱应力峰值区,在工作面出煤柱时(三角形煤柱尖端)形成应力核区,引起该区段煤柱变形和巷道破坏。据此,提出在31109工作面开采前,对应力峰值区和核区巷道进行锚索和注浆补强支护,现场工业性试验取得良好效果,保障了31109工作面过三角形斜交煤柱区安全回采。

关键词：三角形斜交煤柱浅埋煤层斜交煤柱叠加区区段煤柱应力分布应力峰值区

FMCW-InISAR imaging for high-speed target based on bistatic configuration

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Science China(Technological Sciences) 2020年第8期63卷 1452-1469页

作者： WANG Yong RONG JiaJia ZHANG qingxiang HAN Tao Research Institute of Electronic Engineering Technology Harbin Institute of TechnologyHarbin 150001China

Interferometric inverse synthetic aperture radar(InISAR)imaging has been proved to be a powerful means for obtaining threedimensional(3-D)space shape of noncooperative *** modulated continuous wave(FMCW)InISAR(FMCWInISAR)has unique advantages of low power,low cost,and small volume compared with traditional coherent pulsed ***,FMCW-InISAR imaging has two additional issues to consider,the one is the invalidation of the assumption of stop&go,which is caused by the relatively long sweep interval of FMCW;the other is the isolation of the transmitting and receiving antennas,which is the inherent issue of the transmitter-receiver community radar *** solve these two problems,a bistatic FMCW-InISAR imaging algorithm for high-speed targets is proposed in this *** improving the isolation of the transmitting and receiving antennas,a bistatic configuration based FMCW-InISAR system is *** to the characteristics of bistatic,a bistatic equivalent motion model and corresponding signal model are *** the assumption of stop&go is invalid in the case of FMCW,indicating that the target cannot be viewed as motionless during a sweep repetition interval(SRI),a parametric estimation based quadratic phase factor(QPF)compensation method is investigated to eliminate the range walk caused by the radial motion of the target during the *** addition,considering the farfield trait of the target and combining the traditional InISAR imaging process,a combined QPF compensation technique is proposed to reduce the computational burden of the ***,the effectiveness and the robustness of the proposed algorithm are evaluated by some simulations.

关键词： interferometric inverse synthetic aperture radar(InISAR) frequency modulated continuous wave(FMCW) bistatic configuration radial motion compensation high-speed target imaging

基于8D问题求解法解决汽车线束端子偶发失效问题

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汽车电器 2024年第3期 82-84,87页

作者：徐庆祥师娜余姚领克汽车部件有限公司浙江吉利汽车有限公司浙江余姚315400

随着汽车行业的不断发展,汽车线束端子连接问题在汽车市场售后上也随之增多,基于当前8D问题求解法在汽车行业应用广泛,文章结合8D问题求解法分析市场上汽车线束端子连接偶发失效问题,并概述8D问题求解法的特点、应用范围及实施流程,有... 详细信息

随着汽车行业的不断发展,汽车线束端子连接问题在汽车市场售后上也随之增多,基于当前8D问题求解法在汽车行业应用广泛,文章结合8D问题求解法分析市场上汽车线束端子连接偶发失效问题,并概述8D问题求解法的特点、应用范围及实施流程,有益于后续此类问题在生产厂商管控过程中及时发现,并为后续此类问题的解决提供思路。

关键词： 8D问题求解法方向盘功能偶发失效端子虚接端子扩孔使用维修

维普期刊数据库博看期刊

C^(*)-Isomorphisms Associated with Two Projections on a Hilbert C^(*)-Module

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Chinese Annals of Mathematics,Series B 2023年第3期44卷 325-344页

作者： Chunhong FU qingxiang XU Guanjie YAN Health School Attached to Shanghai University of Medicine&Health Sciences Shanghai 200237China Department of Mathematics Shanghai Normal UniversityShanghai 200234China Department of Basic Education Shanghai Urban Construction Vocational CollegeShanghai 201415China

Motivated by two norm equations used to characterize the Friedrichs angle,this paper studies C^(*)-isomorphisms associated with two projections by introducing the matched triple and the semi-harmonious pair of projections.A triple(P,Q,H)is said to be matched if is a Hilbert C^(*)-module,P and Q are projections on H such that their infimum P∧Q exists as an element of L(H),where L(H)denotes the set of all adjointable operators on *** C^(*)-sub algebras of L(H)generated by elements in{P-P∧Q,Q-P∧Q,I}and{P,Q,P∧Q,I}are denoted by i(P,Q,H)and o(P,Q,H),*** is proved that each faithful representation(π,X)of o(P,Q,H)can induce a faithful representation(π,X)of i(P,Q,H)such that π~(P−P∧Q)=π(P)−π(P)∧π(Q),π~(Q−P∧Q)=π(Q)−π(P)∧π(Q)..When(P,Q)is semi-harmonious,that is,R(P+Q) and R(2I−P−Q) are both orthogonally complemented in H,it is shown that i(P,Q,H)and i(I-Q,I-P,H)are unitarily equivalent via a unitary operator in L(H).A counterexample is constructed,which shows that the same may be not true when(P,Q)fails to be ***,a counterexample is constructed such that(P,Q)is semi-harmonious,whereas(P,I-Q)is not *** additional examples indicating new phenomena of adjointable operators acting on Hilbert C^(*)-modules are also provided.

关键词： Hilbert C^(*)-module Projection Orthogonal complementarity C^(*)-Isomorphism

Development of China homogenized monthly precipitation dataset during 1900-2009

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Journal of Geographical Sciences 2012年第4期22卷 579-593页

作者： LI qingxiang PENG Jiadong SHEN Yan National Meteorological Information Center Beijing 100081China Hunan Provincial Climate Center Changsha 410125China

Based on the collection and processing of the China national-wide monthly station observational precipitation data in 1900-2009, the data series for each station has been tested for their homogeneity with the Standard Normalized Homogeneity Test （SNHT） method and the inhomogeneous parts of the series are adjusted or corrected. Based on the data, the precipitation anomalies during 1900-2009 and the climatology normals during 1971-2000 have been transformed into the grid boxes at 5°×5° and 2°×2° resolutions respectively. And two grid form datasets are constructed by combining the normal and anomalies. After that, the missing values for the 5°×5° grid dataset are interpolated by Empirical Orthogonal Function （EOF） techniques. With the datasets of different resolutions, the precipitation change series during 1900-2009 over China's Mainland are built, and the annual and seasonal precipitation trends for the recent 110 years are analyzed. The result indicates that the annual precipitation shows a slight dryer trend during the past 110 years, notwithstanding lack of statistical confidence. It is worth noting that after the interpolation of the missing values, the annual precipitation amounts in the early 1900s become less, which increases the changing trend of the annual precipitation in China for the whole 110 years slightly （from -7.48 mm/100a to -6.48 mm/100a）.

关键词： precipitation dataset homogeneity interpolation