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Chemical Measurement and Analysis: from Phenomenon to Essence

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Chinese Journal of Chemistry 2022年第16期40卷 1975-1986页

作者： Wei Zhao Jing-juan xu State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjingJiangsu210023 China Institute of Nanochemistry and Nanobiology School of Environmental and Chemical EngineeringShanghai UniversityShanghai 2004China

The review summaries our achievements in optical,electrochemical,as well as mass spectrometry analysis and imaging with high sensitivity,specificity,and spatiotemporal *** promoted the plasmonic imaging system,and developed ultra-sensitive plasmonic nanoprobes for the tracking of single molecules in single living cells,as well as plasmonic nanocatalysts for highly efficient energy *** addition,we contributed a lot in electrogenerated chemiluminescence(ECL)analysis and *** works including localized surface plasmon resonance(LSPR)enhanced ECL,ECL ratiometric detection,BPE based ECL system,multi-color ECL sensing as well as super-resolved ECL imaging have been initiated by our ***,we also dedicated in nanopipette based electrochemical analysis in single living cells,as well as ESI-MS analysis on short time scale.

关键词： Biosensors Plasmonic imaging Electrogenerated chemiluminescence Electrochemistry Mass spectrometry

Floral Ontogeny of Two Species in Magnolia L.

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Journal of Integrative Plant Biology 2006年第10期48卷 1197-1203页

作者： feng-Xia xu South China Botanical Garden the Chinese Academy of Sciences Guangzhou 510650 China

Floral ontogeny is described in two species of genus Magnolia （Magnollaceae）, Magnolia alboserlcea Chun et C. Tsoong, and M. amoena Cheng, representing subgenus Magnolia and subgenus Yulani In Magnolia, by using scanning electron microscope （SEM）. The sequence of Initiation of floral organs Is from proximal to distal. The three distinct outermost and middle organs are Initiated in sequence, but ultimately form a single whorl, thus their ontogeny Is consistent with a sepal Interpretation. The last three tepals （petals） alternate with the preceding tepal whorl. The members of androeclum and gynoeclum arise spirally, although the androecium shows some Intermedlacy between a spiral and whorled arrangement. The carpel prlmordia initiate in group of four to five. The order of stamen Initiation within each tier Is not determined. The floral ontogeny Is remarkably homogeneous between the subgenus Magnolia and subgenus Yulani that does not support the resuming of genus Yulani.

关键词： floral ontogeny Magnolia albosericea Magnolia amoena subgenus Magnolia subgenus Yulania

A Mean Value of Cochrane Sum

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Acta Mathematica Sinica,English Series 2009年第2期25卷 223-234页

作者： Zhe feng xu College of Science Xi'an Jiaotong University Xi'an 710049 P. R. China Department of Mathematics Northwest University Xi'an 710069 P. R. China

Let q 〉 4 be an integer. The main purpose of this paper is to study the mean value of Cochrane sum C（a, q） in quarter intervals, and obtain a sharp asymptotic formula for it.

关键词： Dedekind sum Cochrane sums mean value asymptotic formula

Attractor for the Extensible Beam Equation with Nonlocal Weak Damping on Time–Dependent Space

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Acta Mathematica Sinica,English Series 2024年第4期40卷 1115-1126页

作者： Chun Xiang ZHAO feng juan MENG Institute of Applied System Analysis Jiangsu UniversityZhenjiang 212013P.R.China School of Mathematics and Physics Jiangsu University of TechnologyChangzhou 213001P.R.China

In this article,we consider the long-time behavior of extensible beams with nonlocal weak damping:ε(t)u_(tt)+Δ^(2)u-m(‖▽u‖^(2))Δu+‖u_(t)‖^(p_(u_(t)))+f(u)=h,whereε(t)is a decreasing function vanishing at *** the theory of process on time-dependent spaces,we investigate the existence of the time-dependent attractor by using the Condition(C_(t))method and more detailed *** results obtained essentially improve and complete some previous works.

关键词： Time-dependent attractor extensible beams equation nonlocal weak damping

Maternal and Fetal Exposure to Four Carcinogenic Environmental Metals

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Biomedical and Environmental Sciences 2010年第6期23卷 458-465页

作者： HUAI GUAN feng-YUAN PIAO XIAO-WEI LI QIU-juan LI LEI xu KAZUHITO YOKOYAMA Department of Occupational and Environmental Health Dalian Medical University Dalian 116044 Liaoning China Department of Obstetrics and Gynecology No. 210 Hospital of PLA Dalian 116021 Liaoning China Department of Public School of Medicine Mie University Tsu Mie-Prefecture Japan

Objective To examine maternal and fetal exposure levels to four carcinogenic metals, arsenic （As）, cadmium （Cd）, nickel （Ni）, and beryllium （Be）, and to investigate their environmental influences. Methods Metal concentrations in maternal and umbilical cord blood were measured by inductively coupled plasma-mass spectrometry （ICP-MS）. Environmental factors that might play a role in exposure were analyzed using Mann Whitney nonparametric U-tests and multiple linear regression. Results The concentrations of As, Cd, and Ni in umbilical cord blood （5.41, 0.87, and 139.54 gg/L） were significantly lower than those in maternal blood （6.91, 1.93, and 165.93 p.g/L）. There were significant positive correlations between the maternal and cord concentrations of each carcinogen. Our results showed that：（i） exposures to potentially harmful occupational factors during pregnancy were associated with high levels of maternal As, Cd, and Ni; （ii） living close to major transportation routes （〈500 m） or exposure to second-hand smoke during pregnancy increased the maternal Cd levels and （iii） living close to industrial chimneys induced high maternal Ni levels. Multiple linear regression analysis showed that these environmental factors remained significant in models of the influences of these four carcinogens. Conclusion Both mothers and fetuses had been exposed to As, Cd, Ni, and Be. The increased levels of these carcinogens in pregnant women were associated with some detrimental environmental factors, such as occupational exposure, contact with second-hand smoke and living close to major transportation routes or industrial chimneys.

关键词： Carcinogenic metals Exposure in utero Maternal blood Cord blood Environment

CONSENSUS AND r-CONSENSUS PROBLEMS FOR SINGULAR SYSTEMS

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Journal of Systems Science & Complexity 2014年第2期27卷 252-262页

作者： ZHANG Lequn feng Jun-e YAO juan School of Mathematics Shandong University

In this paper, the problem of consensus for continuous time singular systems of multi-agent networks is considered. The definition of r-consensus is introduced for singular systems of multi-agent networks. Firstly, linear systems with algebraic constraints are considered, and the corresponding results about consensus and average-consensus are derived. Then r-consensus and consensus problems of singular systems are investigated. Sufficient conditions of r-consensus and consensus are obtained,respectively. Finally, an illustrative example is given to show the effectiveness of the proposed method.

关键词： Balanced graphs consensus r-consensus singular systems strong connected graphs.

A novel method for AFRPs burrs removal:Principle of mechanochemo-induced fiber fracture

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Chinese Journal of Aeronautics 2024年第7期37卷 522-538页

作者： Jie xu Bo LI Pingfa feng Qiang WANG feng feng Division of Advanced Manufacturing Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Changhe Aircraft Industry(Group)Co.Ltd Jingdezhen 333000China

Burrs generated during the machining of Aramid-Fiber-Reinforced Composites(AFRPs)pose a challenge for the production efficiency of aircraft and helicopter housing *** studies have generally attempted to suppress burrs by referring to delamination suppression *** contrast to stratification,burrs are remediable machining *** such,a mechanochemical method with burrs trimming technological strategy are implemented to effectively combat ***,we clarify the mechanism by which aramid fibers cannot be cut off using analytical and numerical *** addition,the mechanism of fiber fracture with Modified Polyurethane Reactive Polymer(M-PUR),and development of anti-burr devices(thermostatic adhesive sealed generator)are ***,the experimental results show that the reduction rate in burr length is 87%-91%through the mechanochemical *** method not only opens a new avenue to solve the burr problem of aramid fibers but also builds an interdisciplinary bridge between polymer science and composite machining.

关键词： Mechanochemical method Burrs Orthogonal cutting Aramid fiber-reinforced composites Milling

Inhibition of bromophenols against PTP1B and anti-hyperglycemic effect of Rhodomela confervoides extract in diabetic rats

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Chinese Science Bulletin 2008年第16期53卷 2476-2479页

作者： SHI DaYong xu feng HE juan LI Jing FAN Xiao HAN LiJun Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China The Affiliated Hospitai of Medical College Qingdao University Qingdao 266003 China

Protein tyrosine phosphatase 1B (PTP1B) plays an important role as a negative regulator in insulin signaling pathways. PTP1B is an effective target for the treatment of type 2 diabetes mellitus. Four bromophenol derivatives from red algae Rhodomela confervoides, 2,2′,3,3′-tetrabromo-4,4′,5,5′-tetra- hydroxydiphenyl methane (1), 3-bormo-4,5-bis(2,3-dibromo-4,5-dihydroxybenzyl) pyrocatechol (2), bis(2,3-dibromo-4,5-dihydroxybenzyl) ether (3) and 2,2′,3-tribromo-3′,4,4′,5-tetrahydroxy-6′-ethyloxy- methyldiphenylmethane (4) showed significant inhibitory activity against PTP1B (IC50 were 2.4, 1.7, 1.5 and 0.84 μmol/L, respectively) as potential therapeutical agents for the treatment of type 2 diabetes mellitus. The anti-hyperglycemic effects of the ethanol extracts from R. confervoides on streptozoto- cin-induced diabetes (STZ-diabetes) in male Wistar rats fed with high fat diet were investigated. The STZ-diabetic rats treated with medium-dose and high-dose alga extracts showed remarkable reductions in fasting blood glucose (FBG) as compared with the STZ-diabetic control. The results indicate that the in vivo anti-hyperglycemic activity of the R. confervoides extracts can be partially attributed to the in- hibitory actions against PTP1B of the bromophenol derivatives and that may be of clinical importance in improving the management of type 2 diabetes mellitus.

关键词：溴苯酚抑制作用萃取液糖尿病

Neuropsychiatric issues after stroke: Clinical significance and therapeutic implications

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World Journal of Psychiatry 2020年第6期10卷 125-138页

作者： Shuo Zhang Michael xu Zhi-Jun Liu juan feng Yan Ma Department of Neurology Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina Department of Clinical Medicine International Education SchoolChina Medical UniversityShenyang 110004Liaoning ProvinceChina Department of Ultrasound Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina

A spectrum of neuropsychiatric disorders is a common complication from *** disorders after stroke have negative effects on functional recovery,increasing the rate of mortality and disability of stroke *** the vital significance of maintaining physical and mental health in stroke patients,neuropsychiatric issues after stroke have raised concerns by clinicians and *** mini-review focuses on the most common non-cognitive functional neuropsychiatric disorders seen after stroke,including depressive disorders,anxiety disorders,post-traumatic stress disorder,psychosis,and psychotic *** each condition,the clinical performance,epidemiology,identification of the therapeutic implication,and strategies are reviewed and discussed;the main opinions and perspectives presented here are based on the latest controlled studies,meta-analysis,or updated systematic *** the absence of data from controlled studies,consensus recommendations were provided accordingly.

关键词： Stroke Neuropsychiatric disorders Depression Anxiety Post-traumatic stress disorder Psychosis