检索结果-南通市图书馆

维普期刊数据库

Gr.dient Estimates for.a Nonlinear.Heat Equation on Compact r.emannian Manifold

在线全文

学校读者我要写书评

暂无评论

Jour.al of Mathematical r.sear.h with Applications 2012年第6期32卷 743-753页

作者： Xinr.ng JIANG1,2, , Caisheng LIAO21. Institute of Mathematics and Infor.ation Science, Jiangxi Nor.al Univer.ity,Jiangxi 330022, P. r. China 2. Depar.ment of Mathematics, East China Nor.al Univer.ity, Shanghai 200241, P. r. China Institute of Mathematics and Infor.ation Science Jiangxi Normal University Jiangxi 330022 Depar.ment of Mathematics East China Normal University Shanghai 200241

In this paper. we study gr.dient estimates for.the nonlinear.heat equation ut △u =au log u, on compact r.emannian manifold with or.without boundar.. We get a Hamilton type gr.dient estimate for.the positive smooth solution to the equation on close manifold, and obtain a Li-Yau type gr.dient estimate for.the positive smooth solution to the equation on compact manifold with nonconvex boundar..

关键词： nonlinear.heat equation r.emannian manifold gr.dient estimates.

SLAG CEMENT r.INFOr.ED BY THE COMBINATION DOPING OF LIMESTONE AND ANHYDr.TE

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Jour.al of Wuhan Univer.ity of Technology(Mater.als Science) 1995年第2期10卷 58-63页

作者：杨淑珍宋汉唐 WUHAN UNIV TECHNOL WUHAN 430070PEOPLES R CHINA

The hydr.tion per.or.ances of slag cement mixed by limestone and anhydr.te have been studied. The phase compositions and micr.str.ctur.s of the hydr.tes wer. deter.ined and analysed by Xr. and SEM. It is discover.d that when slag cement is mixed with limestone and anhydr.te, ihe hydr.tions of the clinker.and slag ar. speeded. The amount of ettr.ngite and hydr.te calcium silicate ar. incr.ased and the mechanical str.ngth of slag cement ar. enchanced.

关键词： COMBINATION DOPING OF LIMESTONE AND ANHYDr.TE MECHANICAL STr.NGTH

维普期刊数据库

Adventur.s in social r.sear.h : data analysis using SPSS 14.0 and 15.0 for.Windows 6th ed.

在线全文

学校读者我要写书评

暂无评论

Adventures in social research : data analysis using SPSS 14....

A r.ce Gr.wth Models (r.M) System by Object-Or.ented Pr.gr.mming with Visual C++

2007年

作者： Babbie Ear. r.

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

Agr.cultur.l Sciences in China 2002年第10期1卷 1133-1140页

作者： MI Xiang-cheng, ZOU Ying-bin, SHI Ji-cheng, CAI Sheng and PENG Zheng-wen(College of Plant Science and Technology, Hunan Agr.cultur.l Univer.ity, Changsha 410128 , P. r. China Ningxiang Agr.cultur.l Bur.au of Hunan Pr.vince , Ningxiang 410600 , P. r. China) College of Plant Science and Technology Hunan Agricultural University Changsha 410128 P.R.China Ningxiang Agr.cultur.l Bur.au of Hunan Pr.vince Ningxiang 410600 P.R.China

Object-or.ented pr.gr.mming divides the cr.p pr.duction into subsystems and simulates their.behavior.. Many classes wer. designed to simulate the behavior. of differ.nt par.s or.differ.nt physiological pr.cesses in cr.p pr.duction system. At the same time, many classes have to be employed for.better.ng user.s inter.ace. But how to manage these classes on a higher.level to cooper.te them into a per.ect system is another.pr.blem to study. The r.ce Gr.wth Models (r.M) system r.pr.sents an effor. to define and implement a fr.mewor. to manage these classes. In r.M system, the classes wer. or.anized into the model-document-view ar.hitectur. to separ.te the domain models, data management and user.inter.ace. A single document with multiple views inter.ace fr.me window was adopted in r.M. In the ar.hitectur.s, the simulation models only exchange data with documents while documents act as inter.ediacies between simulation models and inter.aces. Views get data fr.m documents and show the r.sults to user.. The classes for.the differ.nt functions can be gr.uped into differ.nt ar.hitectur.s. Differ.nt ar.hitectur.s communicate with each other.thr.ugh documents. The classes for.the differ.nt functions can be gr.uped into differ.nt ar.hitectur.s. By using the ar.hitectur., communication between classes is mor. efficient. Modeler.can add classes in ar.hitectur.s or.other.ar.hitectur.s to extend the system without having to change system str.ctur., which is useful for.constr.ction and maintenance of agr.cultur.l system models.

关键词： r.ce Gr.wth model Object-or.ented plogr.mming

维普期刊数据库

Questionnair.s and inventor.es : sur.eying opinions and assessing per.onality

在线全文

学校读者我要写书评

暂无评论

Questionnaires and inventories : surveying opinions and asse...