检索结果-南通市图书馆

A Method of Minimum Reusability Estimation for Automated Software Testing

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2013年第3期18卷 360-365页

作者： KAN Hong-xing wang guo-qiang wang Zong-dian DING Shuai School of Medical Information Technology Anhui University of Traditional Chinese Medicine Hefei 230038 China School of Management Hefei University of Technology Hefei 230009 China

Through reusing software test components, automated software testing generally costs less than manual software testing. There has been much research on how to develop the reusable test components, but few fall on how to estimate the reusability of test conlponents for automated testing. The purpose of this paper is to present a method of minimum reusability estimation for automated testing based on the return on investment （ROI） model. Minimum reusability is a benchmark for the whole automated testing process. If the reusability in one test execution is less than the minimum reusability, some new strategies must be adopted ill the next test execution to increase the reusability. Only by this way, we can reduce unnecessary costs and finally get a return on the investment of automated testing.

关键词： automated software testing manual software testing mean maintenance costs multiplier reusable software test components threshold minimum reusability estimation

Design,Synthesis and Antitumor Activity of Fluoroquinolone C3 Heterocyclic Bis-oxadiazole Methylsulfide Derivatives Derived from Levofloxacin

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2012年第6期28卷 980-984页

作者： HU guo-qlang wang guo-qiang DUAN Nan-nan WEN Xiao-yi CAO Tie-yao XIE Song-qiang HUANG Wen-long Institute of Pharmacy Henan University Kaifeng 475001 P. R. China Centre of Drug Discovery China Pharmaceutical University Nanjing 210009 P. R. China

To discover an efficient route for the shift from an antibacterial fluoroquinolone to an antitumor one based on the mechanistic similarities between targeting topoisomerases and the eukaryotic ones,two series of the title compounds,C3 bis-oxadiazole methylsulfides 6a―6h and corresponding dimethylpiperazinium iodides 7a―7h derived from levofloxacin 1 were designed and *** in vitro antiproliferative activities against Chinese hamster ovary cell line（CHO）,murine leukemia cell line（L1210） and human leukocytoma cell line（HL60） were evaluated by MTT assay,and inhibitory effect on DNA topoisomerase IIα was also measured by means of densitometric assay.

关键词： Fluoroquinolone Oxadiazole Isostere Sulfide Piperazinium Antitumor activity

AERODYNAMIC CHARACTERISTICS ABOUT MINING DUMP TRUCK AND THE IMPROVEMENT OF HEAD SHAPE

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2008年第6期20卷 713-718页

作者： WEI Xiu-ling wang guo-qiang FENG Su-li College of Mechanical Science and Engineering Jilin University Changchun 130022 China Department of Aeronautic Mechanical Engineering Aviation University of Air force Changchun 130022 China Fundamental Science Department Armor Technique Institute Changchun 130117 China

The external flow field around a certain mining dump truck was simulated. The airflow structure and the aerodynamic drag were discussed, and the relationship between airflow characteristics and aerodynamic drag were obtained. In order to solve the problem of head shape of the truck, three scenarios including edge rounding, installing splitter planes and their combination were put forward to improve the head shape through numerical simulation and analysis. The model and method were selected to be three dimensional and time-independent. The Reynolds-averaged Navier-Stokes equations were solved using the finite volume method. The RNG k-ε model was chosen for the closure of the turbulent quantities. The results show that the third scenario is the best one, because of its aerodynamic characteristics being better than those of unimproved model.

关键词： dump truck external flow field numerical simulation

Color-tunable Upconversion Properties of Tb^3+/Er^3+/Yb^3+ Tri-doped Na5Gd(WO4)4 Crystals

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2020年第2期39卷 301-309,186页

作者： XUE Geng CHEN Xin ZHENG Chuan-Xin wang guo-qiang LI Ling-Yun College of Civil Engineering Fuzhou UniversityFuzhou 350108China Key Laboratory of Eco-materials Advanced Technology College of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China

In this work, novel phosphors Na5Gd(WO4)4: Tb^3+/Yb^3+ and Na5Gd(WO4)4: Tb^3+/Er^3+/Yb^3+ phosphors were synthesized by the solid state reaction method. The photoluminescence properties were investigated. The introduction of Er^3+ to NGW: Tb^3+/Yb^3+ was used to modify the chromaticity coordinates, then providing a good color tunable property. The change in the chromaticity coordinates induces the shift of emission color from yellow-green to blue-green for NGW: Tb^3+/Er^3+/Yb^3+ as the temperature increases. All the results indicate that the NGW: Er^3+/Tb^3+/Yb^3+ phosphors may be used as optical temperature sensing materials.

关键词： Na5Gd(WO4)4:Tb3+/Er3+/Yb3+phosphor upconversion luminescence color-tunable

时域混合算法在一维海面与舰船目标复合电磁散射中的应用

在线全文

学校读者我要写书评

暂无评论

物理学报 2017年第18期66卷 39-46页

作者：王强郭立新西安电子科技大学物理与光电工程学院西安710071 陕西学前师范学院计算机与电子信息系西安710100

采用时域积分方程(TDIE)与时域基尔霍夫近似(TDKA)的混合算法研究粗糙海面与舰船目标的复合瞬态电磁散射.该方法将舰船目标及其近邻海面划分为TDIE区域,用TDIE方法精确求解;将剩余电大尺寸的粗糙海面划分为TDKA区域,采用高效的TDKA电流... 详细信息

采用时域积分方程(TDIE)与时域基尔霍夫近似(TDKA)的混合算法研究粗糙海面与舰船目标的复合瞬态电磁散射.该方法将舰船目标及其近邻海面划分为TDIE区域,用TDIE方法精确求解;将剩余电大尺寸的粗糙海面划分为TDKA区域,采用高效的TDKA电流近似求解.通过混合算法和传统TDIE算法结果的对比,表明TDIE-TDKA混合算法能保证计算的精度,同时具有较高的计算效率.最后,讨论了海面上方有无目标、海面上方风速、电磁脉冲入射角、舰船目标尺寸、吃水深度对后向散射磁场的影响.

关键词：粗糙海面混合方法时域积分方程瞬态电磁散射

Evaluation on the Influencing Factors of Agricultural Land Productivity in Huang-Huai Plain,China

在线全文

学校读者我要写书评

暂无评论

Asian Agricultural Research 2010年第8期2卷 58-60,64页

作者： SONG Yan-hua wang guo-qiang Institute of Geography Henan Academy of SciencesZhengzhou 450052China

Taking Huang-Huai Plain as an example,evaluation index system is established from four aspects,including the resources condition,the social and economic condition,the agricultural science and technology condition,and the disaster resistant and sustainable production *** coefficient method and expert consultation method are used to determine the weight of evaluation *** the standardization of extreme value,weighted sum method and multiple regression method are adopted to evaluate the influencing factors of agricultural land productivity in Huang-Huai Plain,*** result shows that agricultural science and technology condition has a lower contribution rate to the productivity of Huang-Huai Plain than that to Henan *** condition has a higher contribution rate to the productivity of Huang-Huai Plain than that to Henan *** the social and economic condition and the disaster control and sustainable production condition show relatively small contribution rate to the productivity of Huang-Huai *** can be concluded that the main factors affecting the productivity of Huang-Huai Plain are the backward agricultural science and technology level,the poor farmland quality and the farmland *** on this,relevant suggestions are put forward to improve the farmland productivity of Huang-Huai Plain.

关键词： Huang-Huai Plain Agricultural land productivity Influencing factor Evaluation index system China

NUMERICAL SIMULATION OF THE TURBULENT FLOW IN ROTATING DUCT

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

Journal of Hydrodynamics 1999年第2期11卷 118-124页

作者： Li Wei wang guo-qiang(Shanghai Jiaotong University, Shanghai 200030,P. R. China)

The SIMPLEC algorithm is adopted to simulate the turbulent flow in rotating duct, coupling with the RNG K-ε model in this paper. Comparison between computational results and experimental data shows good accuracy and convergence of the presentmethod. It is found from the computational results that increasing the rotational speed ordecreasing the inlet main stream velocity has a great influence on the main stream velocity. The cross pressure difference increases. The slow vefority field near the pressure surface is expanding and moving to the suction surface. And the location of the main streamvelocity peak tends to the suction surface.

关键词： duct flow turbulent flow numerical simulation

HD61202U液晶显示驱动控制器在智能开关中应用

在线全文

学校读者我要写书评

暂无评论

辽宁工程技术大学学报（自然科学版） 2005年第z1期24卷 132-134页

作者：王国强辽宁工程技术大学电气工程系辽宁阜新123000

针对煤矿设备电机运行中出现的各种电流、电压故障,研制了矿用智能型开关,用以检测电压、电流故障,并给出液晶显示。阐述了点阵式液晶MGLS19264的结构特点及控制器HD61202U的指令系统,设计了MGLS19264与单片机PIC16F877A的新型硬件接口... 详细信息

针对煤矿设备电机运行中出现的各种电流、电压故障,研制了矿用智能型开关,用以检测电压、电流故障,并给出液晶显示。阐述了点阵式液晶MGLS19264的结构特点及控制器HD61202U的指令系统,设计了MGLS19264与单片机PIC16F877A的新型硬件接口电路。并着重介绍了其在矿用智能开关中的汉字的显示方法及程序流程图。

关键词：液晶显示单片机接口电路智能开关

Stochastic synchronization of coupled harmonic oscillators in the sense of probability distribution

在线全文

学校读者我要写书评

暂无评论

Stochastic synchronization of coupled harmonic oscillators i...