检索结果-南通市图书馆

天津大学学报 1992年第4期25卷 105-112页

作者：拉尔曼kh 乌珀塔尔大学

考察了分析结构、结构构件以及技术系统中的位移、应变与应力的测量和实验方法在目前和未来的作用。现在,比以往任何时候都更有理由和有更广阔的领域需要用到实验力学方法;许多先进、现代化技术,新型测量设备,测量和赋值过程自动化系统... 详细信息

考察了分析结构、结构构件以及技术系统中的位移、应变与应力的测量和实验方法在目前和未来的作用。现在,比以往任何时候都更有理由和有更广阔的领域需要用到实验力学方法;许多先进、现代化技术,新型测量设备,测量和赋值过程自动化系统可供使用;以先进的测量技术和计算机技术相结合而形成的各种杂交法已被提出来。利用这些方法,可以优化结构和产品,节约能源和原材料,提高产品质量,增强结构、技术系统的可靠、安全性,控制生产过程以及监督操作系统的安全性;利用这些方法,能够并且应当使技术系统可能发生的危险以及对环境的毁损降至最低程度。

关键词：实验力学杂交法工业应用

在线全文

学校读者我要写书评

暂无评论

异质双材料界面端部应力奇异性的实验分析

力学学报 1995年第4期27卷 506-512页

作者：亢一澜 Laer.,kh 天津大学力学系

用高灵敏度的云纹干涉实验方法测量了弯曲载荷作用下异质结构的位移场，并采用局部混合法对实验结果进行处理，根据结果对界面端部区域的应力分布规律进行了讨论；求出了应力奇异性阶数λ和应力强度因子Ｋ，并将这一结果与Ｂｏｇｙ￣［... 详细信息

用高灵敏度的云纹干涉实验方法测量了弯曲载荷作用下异质结构的位移场，并采用局部混合法对实验结果进行处理，根据结果对界面端部区域的应力分布规律进行了讨论；求出了应力奇异性阶数λ和应力强度因子Ｋ，并将这一结果与Ｂｏｇｙ￣［１］等人用理论分析的方法所预期的结果和有限元计算结果进行了比较。本文的工作从实验的角度证实了异质双材料结构界面端部区域的应力状态可以用表达式：σ＿（ｉｊ）（ｒ，θ）＝ｋ·ｒ￣（－λ）ｆ＿（ｉｊ）（θ）来描述。

关键词：异质材料应力奇异性云纹干涉法材料力学

Metal foam and fin implementation into a triple concentric tube heat exchanger over melting evolution

在线全文

学校读者我要写书评

暂无评论

Theoretical & Applied Mechanics Letters 2022年第2期12卷 118-126页

作者： M.A.Erfani Moghaddam M.R.Hassani Soukht Abandani kh.Hosseinzadeh Mohammad Behshad Shafii D.D.Ganji Department of Mechanical Engineering Babol Noshirvani University of TechnologyBabolIran Department of Mechanical Engineering Sharif University of TechnologyTehranIran

It is believed that it is going to be a sizeable mismatch between supply and demand when it comes to renewable ***,researchers are on course to compensate for the unpredictabilityof such resources by the employment of phase change materials(PCMs).Having multiple advantages,PCMs generally suffer from inadequate thermal conductivity which causes prolonged transition *** tackle this issue,this study is fixated on two parameterswhich are linked to fins addition and porous media incorporation in a melting process within a triple concentric tube heat exchanger(TCTHX).The results provided by multiple cases underlined the significance of natural convection in the bare system,although finned and copper-metal-foam cases outshine buoyancy forces by roughly 45%and 97%,*** is a major determent when it comes to the selection of porous media as Al_(2)O_(3) registered the weakest performance among SiC,Ni and Cu,however,it managed to speed up the process by 75%which still is much higher than the finned system,implying that porous media is of higher priority over *** best scenario transpiredwhile fins and copper metal foam were integrated as 26%and 97%soars in efficacy have been obtained compared to individual incorporation of porous media and fins,respectively.

关键词： Thermal storage TCTHX Fins Melting evolution Porous media Heat exchanger

颗粒内传质参数作为工具用于催化剂颗粒的设计(英文)

在线全文

学校读者我要写书评

暂无评论

催化学报 2012年第7期33卷 1166-1175页

作者： L. PETROV M. DAOUS Y. ALHAMED A. AL-ZAHRANI kh. MAXIMOV SABIC Chair in Catalysis Chemical and Materials Engineering Department Faculty of Engineering King Abdulaziz University PO Box 80204 Jeddah 21589 Kingdom of Saudi Arabia Institute of Catalysis Bulgarian Academy of Sciences Sofia 1113 Bulgaria

A chromatographic method and a dynamic Wicke-Kallenbach method (DMWK) were used to determine the diffusion characteristics of two industrial copper containing catalysts. The first catalyst was used in nitrobenzene hydrogenation to aniline and the second was used in a low temperature water-gas shift reaction. Experimental results show that application of these two methods leads to similar results. Experimental data obtained allow for monitoring changes in the texture of the catalyst grains and intraparticle diffusivity of gaseous reagents at different states of the catalyst activity and use, which can be used as criteria for designing optimal industrial catalyst pellets.

关键词： effective diffusion coefficient tortuosity copper catalyst pellet design

Integral Representations for the Solutions of the Generalized Schroedinger Equation in a Finite Interval

在线全文

学校读者我要写书评

暂无评论

Advances in Pure Mathematics 2015年第13期5卷 777-795页

作者： Anar Adiloglu Nabiev Rauf kh. Amirov Department of Mathematics Cumhuriyet University Sivas Turkey

We reduce the initial value problem for the generalized Schroedinger equation with piecewise-constant leading coefficient to the system of Volterra type integral equations and construct new useful integral representations for the fundamental solutions of the Schroedinger equation. We also investigate some significant properties of the kernels of these integral representations. The integral representations of fundamental solutions enable to obtain the basic integral equations, which are a powerful tool for solving inverse spectral problems.

关键词： One Dimensional Schroedinger Equation Fundamental Solutions Transformation Operator Inte-gral Representation Differential Equation with Discontinues Coefficient Kernel of an Integral Op-erator Integral Equation Method of Successive Approximations

Voltage rise mitigation for solar PV integration at LV grids Studies from ***

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2015年第3期3卷 411-421页

作者： Guangya YANG Francesco MARRA Miguel JUAMPEREZ Søren Bækhøj KJÆR Seyedmostafa HASHEMI JacobØSTERGAARD Hans Henrik IPSEN Kenn H.B.FREDERIKSEN Centre for Electric Power and Energy Department of Electrical EngineeringTechnical University of Denmark2800 Kgs.LyngbyDenmark Danfoss Solar Inverter A/S 6430 NordborgDenmark Østkraft 3700 RønneDenmark FREDERIKSEN Energimidt8600 SilkeborgDenmark

Solar energy from photovoltaic(PV)is among the fastest developing renewable energy systems *** by governmental subsidies and technological development,Europe has seen a fast expansion of solar PV in the last few *** the installed PV plants,most of them are situated at the distribution systems and bring various operational challenges such as power quality and power flow *** paper discusses the modelling requirements for PV system integration studies,as well as the possible techniques for voltage rise mitigation at low voltage(LV)grids for increasing PV *** solutions are listed and preliminary results are presented.

关键词： Solar photovoltaic(PV) Voltage rise Virtual power plants Ancillary services

Anticancer activity of Aloe vera and Calligonum comosum extracts separetely on hepatocellular carcinoma cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Biomedicine 2015年第5期5卷 375-381页

作者： Maram Shalabi kh.khilo Mahmoud M.Zakaria Mahmoud G.Elsebaei Walied Abdo Walaa Awadin Department of Biochemistry Faculty of Veterinary Medicine Mansoura University Department of Biochemistry Faculty of Veterinary Medicine Kafrelsheikh University Urology and Nephrology Center Mansoura University Department of Pathology Faculty of Veterinary Medicine Kafrelsheikh University Department of Pathology Faculty of Veterinary Medicine Mansoura University

Objective: To investigate the in vitro anticancer effect of Aloe vera(A. vera) and Calligonum comosum(C. comosum) extracts against hepatocellular carcinoma(HepG 2) cells. Methods: Hep G2 cells were tested against different doses of A. vera and C. comosum. Viability of the cells was assessed by MTT assay. Evaluation of apoptosis and DNA damage in HepG 2 cells were performed using annexin V apoptosis detection kit. The expression of p53 and anti-apoptotic(Bcl-2) were tested by real time-PCR and flow cytometer analyser. Hematoxylin and eosin stained sections from untreated and treated HepG 2 cells were observed using light ***: The IC50 values of A. vera and C. comosum extracts were(10.45 ± 0.31) and(9.60 ± 0.01) μg/mL respectively. The extracts separately increased cytotoxicity against HepG 2 cells in a time and dose dependent manners. Also, it apparently induced apoptosis through increase P53 and decrease Bcl-2 genes ***: The results indicated that the extracts could have anti-hepatocarcinogenic effect, at least in part, through modulation of apoptosis.

关键词： HepG2 Hepatocellular carcinoma Aloe vera Calligonum comosum Apoptosis

Awareness and Usage of Computer and Internet among Medical Faculties’ Students at the University of Jordan

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Software Engineering and Applications 2016年第5期9卷 147-154页

作者： Tamara Almarabeh Lama Rajab Yousef kh. Majdalawi Computer Information Systems Department The University of Jordan Amman Jordan

The rapid development of information communication technology blazed a trail in our learning, work, and lives. This study was conducted to ascertain the computer and internet literacy level of medical faculties’ students. 171 first-year medical students from 4 different medical colleges of the University of Jordan participated in the study. A semi-structured questionnaire was used to collect the data and the data analysis was done by using SPSS, Version 17. The results indicated that most medical students have average 5 or advance knowledge on the basic use of computer and internet. Google was found to be the most commonly used search engine. Also the study found that ICT (Information and Communication Technology) can be a useful tool in medical education but the lack of time, internet connectivity and resources is still a serious constraint.

关键词： ICT Jordan Internet Attitudes Literacy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

个人与连贯性日常生活活动的累积评分法

国外医学（物理医学与康复学分册） 1990年第4期10卷 170-173,169页

作者： ■sberg kh 夏嫣

随着年龄的增长,老年人对个人和家务活动需要帮助的程度也增加了。个人活动需要帮助时在个人日常生活活动(P-ADL)例如进食、上厕所、穿衣和洗澡等中常描述为依赖或自立。家务活动需要帮助即在连贯性日常生活活动(I-ADL)例如烹调、购物... 详细信息

随着年龄的增长,老年人对个人和家务活动需要帮助的程度也增加了。个人活动需要帮助时在个人日常生活活动(P-ADL)例如进食、上厕所、穿衣和洗澡等中常描述为依赖或自立。家务活动需要帮助即在连贯性日常生活活动(I-ADL)例如烹调、购物、清扫也常用相同的词描述。这篇文章报告扩充的日常生活活动能力评定试用的结果。

关键词：老年人日常生活活动评分