检索结果-南通市图书馆

Applying a statistical method to streamflow reduction caused by underground mining for coal in the Kuye River basin

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2016年第12期59卷 1911-1920页

作者： LI Shu chen yuanfang LI ZhiJia ZHANG Ke College of Hydrology and Water Resources Hohai University Yellow River Institute of Hydraulic Research Yellow River Conservancy Commission

Streamflow in the Kuye River basin has been sharply reduced by the effects of climate change and human *** 1997,the intensification of coal mining has resulted in substantial reductions to streamflow alongside an ever-increasing demand for *** this study,we present a derived statistical method,incorporating the Mann-Kendall and Pettitt method(MK-P) and the Soil and Water Assessment Tool(SWAT),and apply it to estimating the streamflow reductions caused by underground mining for coal in the Kuye River *** results show that underground mining is an important cause of the streamflow reductions observed since1997,being responsible for reductions of 21.15 mm/yr(~56%of the total) during *** results of the SWAT simulation were assessed by several performance criteria:Nash-Suttcliffe Efficiency(Nse),correlation coefficient(R^2),relative error(RE),P-factor and *** close match between the simulations and observed data supports the reasonability of our *** suggest that engineering strategies be adopted to limit streamflow loss into goafs via fractured zones in the coalfield.

关键词： underground mining for coal streamflow MK-P SWAT statistical method

Fabrication of strongly adherent platinum black coatings on microelectrodes array

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2014年第4期57卷 208-217页

作者： TANG RongYu PEI WeiHua chen SanYuan ZHAO Hui chen yuanfang HAN Yao WANG ChunLan chen HongDa State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of Sciences State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of Sciences Beijing 100083 China Department of Tissue Engineering Institute of Basic Medical Sciences and Tissue Engineering Research CenterAcademy of Military Medical Sciences

Platinum black coating can effectively improve the performance of MEAs(microelectrodes array)in neural signal transduction,though its lack of adhesion strength and durability tampers its usage in long term *** a new method of composite electrodeposition provides highly adhesive platinum black coating that enables MEAs for a month’s long task and repeatable *** new method was compared with present techniques on multiple aspects,*** surface area,surface morphology,interfacial impedance,durability and real application *** show that the new composite coating provides greatly improved durability without compromising its *** cells were cultured on these MEAs for 40 days in vitro and spontaneous action potentials with high signal/noise ratio were *** model and simulation provided preliminary understanding on the mechanism of this strengthened platinum black coating.

关键词： microelectrode array platinum black electroplating electrophysiology neural culture

Sodium Tanshinone Ⅱ A sulfonate for acute myocardial infarction:a systematic review and Meta-analysis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Traditional Chinese Medicine 2021年第1期41卷 26-35页

作者： LIAN Baotao ZENG Ruixiang LIAO Pengda GUO Liheng ZHANG Minzhou chen yuanfang The Second Affiliated Hospital of Guangzhou University of Chinese Medicine Guangzhou510405China The Second Clinical College of Guangzhou University of Chinese Medicine Guangzhou 510120China Guangzhou University of Chinese Medicine Guangzhou 510120China

OBJECTIVE: To investigate the efficacy and safety of Sodium tanshinone ⅡA sulfonate(STS) plus the conventional treatment on acute myocardial infarction(AMI) ***: We searched several electrical databases and hand searched several Chinese medical journals up to January 2019. Randomized controlled trials(RCTs) comparing STS plus conventional treatment with conventional treatment were *** screening, data extraction, quality assessment, and data analysis were conducted in accordance with the Cochrane ***: Sixteen trials involving 1383 people were included. The Meta-analysis showed STS combined with conventional treatment was a better treatment option than conventional treatment alone in reducing the risk of mortality, heart failure, arrhythmia and shock. In addition, STS was associated with improvement in left ventricular ejection fraction(LVEF) and left ventricular end diastolic dimension(LVEDD). No significant difference of STS was found on recurrent angina and recurrent AMI. However,the safety of STS remained uncertain for limited ***: Compared with conventional treatment alone, STS combined with conventional treatment may provide more benefits for patients with AMI. Due to the fact that the overall quality of all included trials is generally low, further large-scale high quality trials are warranted.

关键词： Myocardial infarction Sodium tanshinoneⅡA sulfonate Systematic review Metaanalysis

A flexible capacitive tactile sensor array with micro structure for robotic application

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2014年第12期57卷 41-46页

作者： HU XiaoHui ZHANG Xu LIU Ming chen yuanfang LI Peng PEI WeiHua ZHANG Chun chen HongDa Institute of Semiconductors Academy of Sciences Institute of Microelectronics Tsinghua University

A flexible capacitive tactile sensor array with micro needle structure is proposed in this paper for robotic *** needle layer made of polydimethylsiloxane(PDMS)is sandwiched between the upper electrode layer made of PDMS and the bottom electrode layer fabricated on polyester(PET)*** PDMS material renders the device adequate flexibility as it can be rolled into a *** single cell size in the fabricated 4×4 sensors array is 0.7×0.5 cm2and the initial capacitance of each cell is 0.86 p *** fabricated cell shows a sensitivity of 3.26%/m N within the full scale range of 1 k *** micro needle structure gives better repeatability and *** maximum error during each measurement is about 3.2%,while the minimum error is about 1.2%.

关键词： capacitive sensor flexible tactile sensor micro needle bionic robot

Indole-3-propionic Acid-aggravated CCl_(4)-induced Liver Fibrosis via the TGF-β1/Smads Signaling Pathway

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Clinical and Translational Hepatology 2021年第6期9卷 917-930页

作者： Fei Liu Changfeng Sun yuanfang chen Fei Du Yuxiang Yang Gang Wu Department of Infectious Diseases Department of TuberculosisLaboratory of Infection and ImmunityThe Affiliated Hospital of Southwest Medical UniversityLuzhouSichuanChina

Background and Aims:The pathogenesis of liver fibrosis involves liver damage,inflammation,oxidative stress,and intestinal ***-3-propionic acid(IPA)has been demonstrated to have antioxidant,anti-inflammatory and anticancer activities,and a role in maintaining gut *** current study aimed to investigate the role of IPA in carbon tetrachloride(CCl4)-induced liver fibrosis and explore the underlying ***:The liver fibrosis model was established in male C57BL/6 mice by intraperitoneal injection of CCl4 twice *** intervention was made orally(20 mg/kg daily).The degree of liver injury and fibrosis were assessed by serum alanine aminotransferase(ALT),aspartate aminotransferase(AST),and ***-linked immunosorbent assay and quantitative real-time polymerase chain reaction(qPCR)were used to detect the inflammatory *** malondialdehyde(MDA),glutathione,glutathione peroxidase,superoxide dismutase,and catalase were determined via commercial *** apoptosis was detected by terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling *** expression of mRNA and protein was assayed by qPCR,Western blotting,or immunohistochemical ***:After IPA treatment,the ALT and AST,apoptotic cells,and pro-inflammatory factor levels were enhanced ***,IPA intervention up-regulated the expression of collagen I,α-smooth muscle actin,tissue inhibitor of matrix metalloproteinase-1,matrix metalloproteinase-2,transforming growth factor-β1(TGF-β1),Smad3,and phosphorylated-Smad2/***,IPA intervention did not affect the MDA ***,the administration of IPA remodeled the gut flora ***:IPA aggravated CCl_(4)-induced liver damage and fibrosis by activating HSCs via the TGF-β1/Smads signaling pathway.

关键词： Indole-3-propionic acid CCl_(4) Hepatic fibrosis HSCs TGF-β1

32-site microelectrode modified with Pt black for neural recording fabricated with thin-film silicon membrane

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2014年第5期57卷 292-298页

作者： chen SanYuan PEI WeiHua ZHAO Hui GUI Qiang TANG RongYu chen yuanfang FANG XiaoLei HONG Bo GAO XiaoRong chen HongDa State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of Sciences Institute of Neural Engineering Department of Biomedical Engineering Tsinghua University

Multi-electrode array is an important tool in the study of neural-network,cognition,remembrance,as well as brain-computer-interface,***-like 32-site microelectrodes are developed with *** use of integrated circuit technology,the length of the electrodes,the area of the recording sites,as well as the spaces between the sites are closely ***2/SiNx/SiO2composite dielectric membrane and Pt black are introduced to improve the characteristics of the *** whole thickness of the thin-film probe was 21μ*** combining the modifying process with the micro-fabrication method,this kind of silicon based microelectrode satisfies high-density recording and the performance characterization is evaluated by test in vitro and in vivo.

关键词： microelectrode brain-computer interface thin-film Si Pt black neural recording

High precision intelligent flexible grasping front-end with CMOS interface for robots application

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2016年第3期59卷 176-186页

作者： Xiaohui HU Xu ZHANG Ming LIU yuanfang chen Peng LI Jialin LIU Zhaolin YAO Weihua PEI Chun ZHANG Hongda chen Institute of Semiconductors Academy of Sciences Institute of Microelectronics Tsinghua University

This paper presents a high-precision intelligent flexible robot grasping front-end with an integrated capacitive tactile sensor array and a conditioning chip. The capacitive tactile sensor is the primary part of the front-end, it determines the overall performance. The micro-needle array sandwich structure in the tactile sensor increases the repeatability and stability, and ensures the sensitivity. The assembled sensor exhibits a saturation at 10.53 N(421 k Pa) with a sensitivity of 1.9%/k Pa. Furthermore, a conditioning chip is utilized in a custom readout interface to achieve better performance by reducing signal attenuation, and to increase the compatibility of the front-end. The chip is optimized for the parasitic shunt capacitance in the capacitor array. A dual bidirectional charge-discharge conversion method and a two-port detection method are matched to achieve the goal of reducing the shunting influence, and attenuating the offset voltage or the noise input effects. A prototype of the interface has been fabricated using 180-nm CMOS technology. Sensor with the value of 0.5 p F shunted by capacitors of 47 p F has been detected with an error of 1% within 100 μs.

关键词： Capacitive sensor array flexible sensor tactile sensor micro-needle array bionic robot

Comparative Study on the Microstructure and Mechanical Properties of Mg-Li-Al Based Alloys with Yttrium and Strontium Addition

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2015年第3期30卷 626-630页

作者：许天才彭晓东 JIANG Junwei XIE Weidong chen yuanfang ZHANG Xi College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys College of Materials Science and Engineering Chongqing University of Technology

The effects of yttrium and strontium on the microstructure and mechanical properties of Mg- 11Li-3A1 magnesium alloy （LA113） are compared and analyzed. Microstructures and phases of the alloys were studied with optical microscope （OM）, scanning electron microscope （SEM）, X-ray diffractometer （XRD） and energy dispersive spectrometer （EDS）. Mechanical properties of alloys were measured with tensile tester. The results show that yttrium and/or strontium additions produce a strong grain refining effect in LA113 alloy. AI2Y and AI4Sr, etc. phases with different morphologies are verified and exist inside the grain or at the grain boundaries, which directly impact on the mechanical properties of LA113 alloy. The results of tensile tests show that, the as-extruded LA113-1Y-1 Sr alloy obtains the optimal tensile property of which the tensile strength and elongation are 253.56 MPa and 18.12%, the tensile strength is increased by almost 25% compared with the as- extruded LA113 alloy.

关键词： Mg-Li-A1 alloy yttrium strontium microstructure mechanical properties

GLOBAL ASYMPTOTICAL STABILITY OF AN OBLIGATE LOTKA-VOLTERRA MUTUALISM MODEL

在线全文

学校读者我要写书评

暂无评论

Annals of Differential Equations 2014年第3期30卷 267-271页

作者： yuanfang chen Rongyu Han Liya Yang Fengde chen College of Math.and Computer Science Fuzhou University

By constructing a suitable Lyapunov function,sufficient conditions which ensure the global asymptotical stability of the positive equilibrium and boundary equilibrium of an obligate Lotka-Volterra mutualism model are obtained,*** is shown that the conditions which ensure the local stability of the nonnegative equilibria is enough to ensure their global asymptotical *** result supplements and complements some known result.

关键词： mutualism model obligate global asymptotical stability