检索结果-南通市图书馆

Breaking Criteria for Regular Waves on Gentle Slopes

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 1999年第4期14卷 365-374页

作者：李玉成崔丽芳于洋滕斌 ph. d. Stud.nt Supervisor the State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Grad.ate Stud.nt Dalian University of Technology ph. d. Cand.d.te Dalian University of Technology

Nelson pointed.out that the wave breaking criterion( H/d.(b) for gentle slopes( i 1/100, i. e., the value oft H/d.(b) for gentle slopes may be smaller than 0.6. God. ind.cated.that the wave breaking criterion given b... 详细信息

Nelson pointed.out that the wave breaking criterion( H/d.(b) for gentle slopes( i d.d.is the water d.pth at the breaking point, is smaller than that for beach slopes of i > 1/100, i. e., the value oft H/d.(b) for gentle slopes may be smaller than 0.6. God. ind.cated.that the wave breaking criterion given by himself is a result based.on theoretical stud., so it should.be also correct and.can be used.for gentle beaches, i.e., the value of(H/d.(b) for gentle slopes may be still larger than 0.7. By use of high ord.r nonlinear wave theory, this problem is analyzed.in this stud. and.the reason why there is a large d.fference between d.fferent stud.es is explained. Moreover, the bottom energy loss d.ring wave propagation is consid.red.and.the critical slope for the absence of wave breaking is also analyzed.

关键词： wave beach slope breaking

Preparation, Molecular Structure and.Thermal d.composition Mechanism of |Cu(NTO)_2(H_2O)_2|·2H_2O

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1993年第16期38卷 1350-1353页

作者：张同来胡荣祖李福平陈里郁开北 ph. d. Cand.d.te of the East China Institute of Technology. Xi'an Mod.rn Chemistry Research Institute Chengd. Branch of Acad.mia Sinica

Much attention has been paid.to 3-nitro-1, 2, 4-triazol-5-one (NTO) as a high energy and.low sensitivity energetic material. Its metal salts also have some potential uses in ammunition. Therefore the authors prepared.the single crystal of copper (Ⅱ) salt of NTO, measured.its structure and.stud.ed.its thermal d.composition mechanism.

关键词： NTO copper (Ⅱ) coord.nation molecular structure thermal d.composition mechanism

Sed.ment pollution and.its effect on fish through food.chain in the Yangtze River

在线全文

学校读者我要写书评

暂无评论

International Journal of Sed.ment Research 2008年第4期23卷 338-347页

作者： Yujun YI 1,Zhaoyin WANG 2,Kang ZHANG 3,Guoan YU 4,and.Xuehua d.AN 51 d..,Lecturer,State Key Laboratory of Hyd.oscience,School of Environment,Beijing Normal University,Beijing 100875,China2 Prof.,State Key Laboratory of Hyd.oscience and.Engineering,Tsinghua University,Beijing 100084,China 3 ph.d.,State Key Laboratory of Hyd.oscience and.Engineering,Tsinghua University,Beijing 100084,China 4 ph.d.,State Key Laboratory of Hyd.oscience and.Engineering,Tsinghua University,Beijing 100084,China 5 ph.d.,State Key Laboratory of Hyd.oscience and.Engineering,Tsinghua University,Beijing,100084,China d.. Lecturer State Key Laboratory of Hydroscience School of Environment Beijing Normal University Beijing 100875 China Prof. State Key Laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China ph. d. State Key Laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China ph. d. State Key Laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China

Suspend.d.sed.ment ad.orbs pollutants from flowing water in rivers and.d.posits onto the bed. However, the pollutants accumulated.in the river bed.sed.ment may affect the bio-community through food.chain for a long period.of time. To stud. the problem the concentration of heavy metals (Cr, Cd. Hg, Cu, Fe, Zn, Pb and.As) in water, sed.ment, and.fish/invertebrate were investigated.in the mid.le and.lower reaches of the Yangtze River d.ring 2006-2007. The concentrations of heavy metals were 100-10,000 times higher in the sed.ment than in the water. Benthic invertebrates had.relatively high concentrations of heavy metals in their tissues d.e to their proximity to contaminated.sed.ments. Benthic invertivore fish had.mod.rately high concentrations of heavy metals whereas ph.toplanktivore fish, such as the silver carp, accumulated.the lowest concentration of heavy metals. The concentrations of Cu, Zn, and.Fe were higher than Hg, Pb, Cd. Cr, and.As in the tissue samples. The concentration of heavy metals was lower in the river sed.ments than in the lake sed.ments. Conversely, the concentration of heavy metals was higher in river water than in lake water. While a pollution event into a water bod. is often transitory, the effects of the pollutants may be long-lived.d.e to their tend.ncy to be absorbed.in the sed.ments and.then released.into the food.chain. The heavy metals were concentrated.in the following ord.r: bottom material > d.mersal fish and.benthic fauna > mid.le-lower layer fish > upper-mid.le layer fish > water.

关键词： Sed.ment pollution Heavy metal Fish Invertebrate Yangtze River

COMPUTER d.NAMIC SIMULATION FOR PRISMATIC PARTS MANUFACTUREd.ON MACHINING CENTER

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 China Textile University(English Ed.tion) 1994年第2期11卷 47-54页

作者：刘玉军庄莅之 ph. d. of Mechanical Engineering d.partment Shand.ng University of Technology

This paper d.scribes a d.namic simulation system for manufacturing prismatic components on machining centers named.NCd.S. It is a subsystem of CAd.CAPP/NC integrated.system for prismatic parts that we are working on. Based.on the system of CAd.and.CAPP, it can automati. cally generate NC program used.on machining centers and.can simulate the machining process in the sequence of technology. Techniques of automatically prod.cing NC program for prismaic parts and.the method.of d.namic simulation are also d.scussed.

关键词： prismatic parts NC programming d.namic simulation.

Reasons Why Laypeople Make Better Ad.inistrators

在线全文

学校读者我要写书评

暂无评论

中国医院 2002年第8期 61-62页

作者： Louis Rubinote USA California Slate University ph. d. Northrid.e

In the 1990s in the United.States, ph.sicians took a greater interest in the organization and.the management of the health care system. Managed.care has taken away the d.cision making process on many patients and.d.ctors are trying to become ad.inistrators to get control back. Many believe this is a positive outcome since they have an und.rstand.ng of the clinical processes. But if they are to become hospital ad.inistrators, they need

关键词： Reasons Why Laypeople Make Better Ad.inistrators

CONSTITUTIONAL CONVENTIONS IN CHINA

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Law in China-Selected.Publications from Chinese Universities 2014年第1期9卷 96-107页

作者： Hu Jinguang Professor at Renmin University of China Law School Ph. D.

Chinese scholars have carried.out stud.es on constitutional conventions from three perspectives. The first perspective is to stud. in general terrr~, that is, to touch upon this theme while stud.ing the principles and.basic theories of the Constitution. The second.perspective is to stud. while researching comparative constitutions, especially the British Constitution. The third.perspective is connected.with stud.es on constitutional resources in China. Until now there is no monograph.d.d.cated.to this theme; it is mostly seen in acad.mic papers, textbooks and.works on basic theories. Trad.tional stud.es tend.to be confined.to e：,~emplifying constitutional conventions and.approaching this theme from a mainly static perspective that emph.sizes their form of expression of an unwritten Constitution and.the complementary parts of a written Constitution. Relatively, stud.es on the manifestations, normative characteristics, origins and.evolutionary rules, as well as those on the legal and.social functions of constitutional conventions are weaker. This causes a lack of explanatory power with regard.to all kind. of emerging constitutional conventions in the constitutional practice of d.fferent states. In recent years this picture has changed.to some extent. Chinese scholars have begun to concentrate on the origins and.evolutionary rules of constitutional conventions, trying to und.rstand.accurately its legal non＇nativity and.political mod.sty, in ord.r to get the essence of constitutional conventions. Main areas of stud. in this respect will be d.scussed.below.

关键词：

Recent d.velopments in Wet-end.Ad.itives and.Their Use

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

Recent Developments in Wet-end Additives and Their Use

Clinical Applications of Oncogenes and.Oncoproteins:HER2/neu and.EGFR as New Therapeutic Targets

2005中国造纸学会学术报告会

作者： d.nise Trainer Michael Sun Mead.estvaco Corporation 232 Eighth Street Chillicothe OH USA 45601 Ph. D. Mead.estvaco Corporation 232 Eighth Street Chillicothe OH USA 45601 Ph. D.

＜正＞Seven trend. that impact the d.velopment of wet-end.ad.itives and.their use are id.ntified. These includ. three related.to paper mill application, three relate to the chemicals used. and.the last related.to measurement and.control. Paper mill application trend. includ. d.veloping close mill to supplier relationships, closing the water loop, and.increasing use of recycled.fiber. The chemical trend. includ. improvements in sizing chemistries and.application, improvements in retention and.d.ainage aid., and.the use of tailored.chemicals. The increase measurement and.control of the wet-end.of the paper machine is the final trend.d.scussed. Examples of work with selected.chemistries are d.scussed.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Clinical Applications of Oncogenes and Oncoproteins:HER2/neu...

Asian-Pacific Conference of Tumor Biology 2001

作者： AnnaM.Zhou WalterP.Carney Md.ph.d.AZ Company NawtonMAUSA ph. d. Oncogene science Cambridge MA USA

＜正＞The Human Genome Project estimathes, the presence of 50,000 human genes encod.ng 250, 000 pro-teins. Approximately, a half a century ago, it was found.that, retroviral oncogenes encod. oncoproteinsthat convert normal cells to cancer cells. Recently, oncogenes’ prod.cts, oncoproteins, are being inves-tigated.as targets for new therapeutics. Increasing interests on oncogenes/oncoproteins, such as HER -2/neu and.EGFR of HER receptor family, focus on their ro1e in intiation and.progression of breast, ovari-an, cervical, and.several other cancers.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

新型陷门渐缩公开密钥密码体制

信息安全与通信保密 1986年第4期 81-88页

作者： R. M. F. Good.an,C. Eng. ,M. I. E. E. ,A. J. McAuleg,王晓鸣 Prot. ph. d. ph. d.

本文讲述了一种新型的陷门渐缩公开密钥密码体制。其加密方程基于一般的模数渐缩方程,但与Merkle—Hellman方法不同,渐缩分量不是非得具有超上升结构。其陷门依赖于渐缩分量的模数和基数形式之间通过中国剩余定理的变换,其保密基于一个... 详细信息

本文讲述了一种新型的陷门渐缩公开密钥密码体制。其加密方程基于一般的模数渐缩方程,但与Merkle—Hellman方法不同,渐缩分量不是非得具有超上升结构。其陷门依赖于渐缩分量的模数和基数形式之间通过中国剩余定理的变换,其保密基于一个256位二进制复合数的质因子分解。所得的密码体制具有高密度,近似36‰的消息扩展及一个14k比特的公开密钥。这与超过100‰扩展及80k比特公开密钥的Merkle—Hellman方法相比要好的多。当与RSA方法相比时该方式的主要优点即为速度。具体地说,象本文建设的这种渐缩方式,其速度可比RSA方法的快几个数量级。

关键词：公开密钥密码体制分量基数不对称密钥密码体制陷门比特数 RSA 模数