检索结果-南通市图书馆

Underground Space 2024年第1期14卷 219-238页

作者： Fayun Liang Zhuwei Jiang Qiang Yuan lin Li Rulu Wang Department of Geotechnical Engineering Tongji UniversityShanghai 200092China School of Highway Chang’an UniversityXi’an 710064China Shanghai Shentong Metro Group Limited Maintenance Center Shanghai 20070China

The surcharge load at the ground surface inevitably breaks the original equilibrium state between the underneath tunnel and the surrounding soil,which will impact the service performance of a subway *** paper presents a novel semi-analytical approach for assessing the time-dependent,longitudinal responses of a subway tunnel in soft soil strata induced by the surcharge *** solution is developed based on the framework of the classical"two-stage method"but innovatively incorporates the effects of ground stratification,the consolidation process,and the longitudinal stiffness reduction of the ***’s poroelastic theory in conjunction with the Laplace-Fourier transform technique is selected to model the deformation of the stratified ground,while the Timoshenko beam on a Pasternak foundation is employed to model the mechanical responses of the *** proposed semi-analytical solution is validated not only by comparison with benchmark solutions and a finite element model,but also by predicting a well-documented field *** analyses are conducted to investigate the effects of the elastic modulus and the permeability coefficient of the stratified ground on the longitudinal responses of the *** is expected that the proposed solution can serve as a useful tool for evaluating the effects of the surcharge load on the longitudinal responses of a subway tunnel.

关键词： Time-dependent Longitudinal responses Stratified ground Subway tunnels Ground surface surcharge Consolidation

Water Supply Improvement and Health Promotion Campaigns in Rural Areas—China,1949−2020

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China CDC weekly 2021年第1期3卷 10-13页

作者： Hongxing Li Alasdair Cohen lin lin Xiaoxiao Zhang Rong Zhang National Center for Rural Water Supply Technical Guidance Chinese Center for Disease Control and PreventionBeijingChina Department of Population Health Sciences&the Public Health Program Virginia Polytechnic Institute&State University(Virginia Tech)BlacksburgVAUSA Office for public health management Chinese Center for Disease Control and PreventionBeijingChina

In the 1950s,shortly after the founding of the People’s Republic of China(PRC),the central government created the Patriotic Health Campaign(PHC)in order to standardize and disseminate healthfocused educational materials intended to control and prevent infectious diseases(1).“Water improvement”,meaning measures aimed at providing safe drinking water for households in China,was an important part of the *** 60 years of water improvement policies.

关键词： diseases Rural founding

Indirect Electrochemical Oxidation of 4-Amino-dimethyl-aniline Hydrochloride

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2006年第3期22卷 360-363页

作者： ZHANG Qiang KANG Bo XU Hong lin Hai-bo Department of Chemistry College of Science Beijing Institute of Technology Beefing 100081 P. R. China College of Chemistry Jilin University Changchun 130021 P. R. China

The indirect dectrechemical oxidation of 4-amino-dimethyl-aniline hydrochloride containing wastewater generated from vanillin production is presented. Experiments were conducted at a constant current density of 30 rnA/cm^2 via a Ti/Bu-Ti-Sn ternary oxide coated anode and an undivided reactor. During the various stages of the electrolysis, parameters such as the values of chemical oxygen demand（COD） and total organic carbon（TOC） were determined in order to evaluate the feasibility of the electrochemical treatment. The energy consumption and the current efficiency during the electrolysis were calculated. The present study proves the effectiveness of the electrochemical treatment for wastewater resulted from vanillin production.

关键词： Electrochemical oxidation 4-Amino-dimethyl-aniline Wastewater treatment Vanillin

Crystal Structure of a New Cembranolide Diterpene

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2002年第2期18卷 189-191页

作者： lin Cui wu SU Jing yu ZENG Long mei School of Chemistry and Chemical Engineering Zhongshan UniversityGuangzhou 510275P.R.China Department of Chemistry Guangxi UniversityNanning 530004P.R.China

A new cembranoide deterpene was isolated from the soft coral Sinularia Tenella . The crystal and chemical structure of the title compound were determined by means of spectroscopic methods and X ray diffraction analysis as ( 1R *,4R *,5S *,12S *,12R * ) 9 acetoxy cembr 8\%E\%,15(17) dien 16,4 olide. It shows a moderate cytotoxicity against P 388 and L 1210 cell lines.

关键词： Crystal structure Cembranolide diterpene X ray diffraction Sinularia tenella

Bubble Coalescence Heat Transfer During Subcooled Nucleate Pool Boiling

在线全文

学校读者我要写书评

暂无评论

工程热物理学报 2012年第12期33卷 2171-2175页

作者： Abdoulaye Coulibaly lin Xipeng Bi Jingliang David M Christopher Department of Thermal Engineering Tsinghua University

Bubble coalescence during subcooled nucleate pool boiling was investigated experimentally using constant wall temperature boundary conditions while the wall heat flux was measured at a various locations to understand the effects of coalescence on the heat *** observations showed that the coalesced bubble moved and oscillated on the heater surface with significant heat transfer variations prior to *** observations also showed coalescence with no increase in the heat transfer *** heat flux for boiling with coalescence fluctuated much more than for single bubble boiling due to the vaporization of the liquid layer trapped between the bubbles.

关键词： microheater pool boiling bubble coalescence bubble dynamics

Morphology of Platinum Nanowire Array Electrodepostied Within Anodic Aluminium Oxide Template Characterized by Atomic Force Microscopy

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2003年第5期20卷 763-766页

作者： KONGling-Bin LUMei LIMeng-Ke GUOXin-Yong LIHu-lin CollegeofChemistryandChemicalEngineering LanzhouUniversityLanzhou730000 LaboratoryofSpecialFunctionalMaterials HenanUniversityKaifeng475001

Uniform platinum nanowires were synthesized by electrodepositing the platinum under a very low altering current frequency (20Hz) and increasing voltage (5-15V) in the pores of anodic aluminium oxide (AAO) template. Atomic force microscopy observation indicates that the template membranes we obtained have hexagonally close-packed nanochannels. The platinum nanowires have highly ordered arrays after partially dissolving the aluminium oxide membrane. With the increasing dissolving time, the platinum nanowire array collapsed. A concave topography of the aluminium substrate was observed after the aluminium oxide membrane was dissolved completely and the platinum nanowires were released from the template. Platinum nanowires were also characterized by transmission electron microscopy and the phase structure of the Al/AAO/Pt composite was proven by x-ray diffraction.

关键词：原子力显微镜氧化铝薄膜铂 X射线衍射显微结构

HiTL-based adaptive fuzzy tracking control of MASs:A distributed fixed-time strategy

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) 2023年第10期66卷 2907-2916页

作者： LIU Yang CHI RongHu LI HongYi WANG LiJie lin Na College of Automation and Electronic Engineering Qingdao University of Science and TechnologyQingdao 266061China School of Automation Guangdong University of TechnologyGuangzhou 510006China Guangdong Province Key Laboratory of Intelligent Decision and Cooperative Control Guangdong University of TechnologyGuangzhou 510006China Institute of Complexity Science and the School of Automation Qingdao UniversityQingdao 266071China

Human-in-the-loop(HiTL)control is promising for the cooperative control problem of multi-agent systems(MASs)under the complicated *** considering the effect of human intelligence and decision making,the system robustness and security are notably ***,a distributed fixed-time tracking control problem is investigated in this paper for heterogeneous MASs based on the HiTL ***,a lemma of practically fixed-time stable is given where an explicit relationship of settling time and convergence domain is clearly ***,under the framework of the adaptive backstepping approach,a series of modified intermediate control signals is designed to avoid the singularity problem by taking advantage of power transformation,fuzzy logic systems,and inequality ***,the numerical example and comparison results are utilized to testify the effectiveness of the proposed method.

关键词： human-in-the-Loop heterogeneous MASs fixed-time stable adaptive tracking control fuzzy logic systems

DRY SLIDING WEAR OF PM Al-10Ti ALLOY

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1998年第3期8卷 66-71页

作者： Wu, Nianqiang Wu, Jinming lin, Shuo Zhou, Jinqi Li, Zhizhang Zhejiang Univ Hangzhou China

１ＩＮＴＲＯＤＵＣＴＩＯＮＤｕｒｉｎｇｄｒｙｓｌｉｄｉｎｇｏｆｔｈｅａｌｕｍｉｎｕｍａｌｏｙｓａｎｄａｌｕｍｉｎｕｍｍａｔｒｉｘｃｏｍｐｏｓｉｔｅｓａｇａｉｎｓｔｓｔｅｅｌｓ，ｔｈｅｒｅｅｘｉｓｔｔｗｏｄｉｓｔｉｎｃ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＤｕｒｉｎｇｄｒｙｓｌｉｄｉｎｇｏｆｔｈｅａｌｕｍｉｎｕｍａｌｏｙｓａｎｄａｌｕｍｉｎｕｍｍａｔｒｉｘｃｏｍｐｏｓｉｔｅｓａｇａｉｎｓｔｓｔｅｅｌｓ，ｔｈｅｒｅｅｘｉｓｔｔｗｏｄｉｓｔｉｎｃｔｗｅａｒｒｅｇｉｍｅｓ，ｉ．ｅ．...

关键词： Al Ti alloy dry sliding wear delamination

ANALYSIS OF FIRST TRANSIENT PRESSURE OSCILLATION FOR LEAKDETECTION IN A SINGLE PIPElinE

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2012年第3期24卷 363-370页

作者： YANG Kai-lin LI Fu-tian WANG Tao FU hui State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of WaterResources and Hydropower Research Beijing 100038 China

The leak detection is of great importance in the reliable operation and management of a pipeline system. Recently, attention is shifted to the use of the time domain or frequency domain methods based on the transient analysis. These methods sometimes require accurate pressure signals obtained during the transient period or by creating ideal conditions in testing. This paper proposes a method that does not require transient simulations over the whole or an extended period of time, but uses the first transient pressure oscillation to detect leaks. The method considers the propagation of the pressure oscillation wave created from a fast valve closure and the reflected damp wave from the leak. A leak in the pipe gives rise to reflected waves which in turn create discontinuities in the observed signal at the measurement section. The timing of the reflected damp wave and the magnitude represent the location and the size of the leak, respectively. An analytical expression is derived based on the Method Of Characteristic （MOC） for the relationship between the leakage and the reflected magnitude. The leak detection procedure based on the method is also given. Then the reliability of the method is tested on numerically simulated pressure signals and experimental pressure signals with calibrated leak parameters, and the results indicate a successful application and the promising features of the method.

关键词： leak detection hydraulic transient pressure oscillation pipeline

In vitro and in vivo antioxidative and hepatoprotective activity of aqueous extract of Cortex Dictamni

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2017年第16期23卷 2912-2927页

作者： lin Li Yun-Feng Zhou Yan-lin Li Li-Li Wang Hiderori Arai Yang Xu Institute of Medicinal Plant Development Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100193China Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine Ministry of EducationBeijing 100193China Department of Human Health Sciences Kyoto University Graduate School of MedicineKyoto 606-8507Japan

AIM To investigate the antioxidant and hepatoprotective effects of Cortex Dictamni aqueous extract(CDAE) in carbon tetrachloride(CCl4)-induced liver damage in *** The in vitro antioxidant effect of CDAE was investigated using α,α-diphenyl-β-picrylhydrazyl(DPPH), 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid)(ABTS), β-carotene bleaching, reducing power, and thiobarbituric acid reactive substance assays. A linoleic acid system, including ferric thiocyanate(FTC) and thiobarbituric acid(TBA) assays, was used to evaluate the inhibition of lipid peroxidation. The in vivo hepatoprotective and antioxidant effects of CDAEagainst CCl4-induced liver damage were evaluated in Sprague-Dawley rats. Silymarin was used as a positive control. Liver damage was assessed by determining hepatic histopathology and liver marker enzymes in serum. Enzyme and non-enzyme antioxidant levels and lipid peroxide content were measured in the liver. Cytochrome P450 2E1(CYP2E1) protein expression was measured via immunohistochemical staining. Nuclear factor E2-related factor(Nrf2), heme oxygenase-1(HO-1), NAD(P)H quinine oxidoreductase 1(NQO1), and γ-glutamylcysteine synthetase catalytic subunit(γ-GCSc) protein expression was measured by Western *** Our results showed that CDAE exhibited a strong antioxidant activity in vitro. CDAE scavenged DPPH and ABTS radicals in a dose-dependent manner. CDAE inhibited lipid peroxidation with a lipid peroxide inhibition rate of 40.6% ± 5.2%. In the FTC and TBA assays, CDAE significantly inhibited lipid peroxidation(P line phosphatase, glutamate pyruvate transaminase, aspartate aminotransferase, and total bilirubin levels in rats of both sexes(P < 0.05, 0.01, or 0.001). Moreover, CDAE restored the decreased activities

关键词： Cortex Dictamni Antioxidant activity Hepatoprotective Carbon tetrachloride Nrf2