检索结果-南通市图书馆

Routing Protocols for Transmitting Large Databases or Multi databases Systems

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2001年第Z1期6卷 448-450页

作者： He Hong, Ma Shao han Computer Science Department of shandong University, jinan 250100, china Computer Science Department of shandong University Jinan China

Most knowledgeable people agree that networking and routing technologies have been around about 25 years. Routing is simultaneously the most complicated function of a network and the most important. It is of the same kind that more than 70% of computer application fields are MIS applications. So the challenge in building and using a MIS in the network is developing the means to find, access, and communicate large databases or multi databases systems. Because general databases are not time continuous, in fact, they can not be streaming, so we can't obtain reliable and secure quality of service by deleting some unimportant datagrams in the databases transmission. In this article, we will discuss which kind of routing protocol is the best type for large databases or multi databases systems transmission in the networks.

关键词： network routing protocol databases transmission

Comparison of Structure and Properties among Various PAN Fibers for Carbon Fibers

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2005年第3期21卷 376-380页

作者： Dongxin HE, Chengguo WANG, Yujun BAI and Bo ZHU College of Materials Science and Engineering, shandong University, jinan 250061, china College of Materials Science and Engineering Shandong University Jinan 250061 China

To find out the high-quality polyacrylonitrile (PAN) fibers, some differences are sought by comparing domestic PAN fibers with the foreign ones. X-ray diffractometer (XRD), transmission electron microscope (TEM), Fourier transform infrared (FT-IR) spectrometer, elemental analyzer, tensile-testing machine and high-temperature differential scanning calorimeter (DSC) are used to characterize the individual microstructure, chemical structure, elemental content, mechanical properties and thermal properties. It is found that high-quality PAN fibers have high density, lower titre, higher or adequate tensile strength, and they also have better conglomeration structure, smaller crystal dimension with dispersive distribution, less microvoids and flaws.

关键词： Polyacrylonitrile (PAN) fiber Carbon fiber Structure Properties

An important military city of the Early Western Zhou Dynasty:Archaeobotanical evidence from the Chenzhuang site,Gaoqing,shandong Province

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2012年第Z1期 255-262页

作者： JIN GuiYun1*,ZHENG TongXiu2,LIU ChangJiang3,WANG ChuanMing1 & GAO MingKui2 1 Center for East Asia Archaeology,shandong University,jinan 250100,china 2.shandong Provincial Institute of Cultural Relics and Archaeology,jinan 250012,china 3 Institute of Botany,Chinese Academy of Sciences,Beijing 100093,china

In ancient Chinese history,the Western Zhou Dynasty has long been renowned for having expanded its control and territory into many other ***,historical documents and archaeological records of this period are limited;thus the early history of the Western Zhou Dynasty's operation in eastern china and its establishment of the Qi and Lu states have been *** discovery of the Chenzhuang city site in Gaoqing County,shandong Province,with chariot-horse pits,an altar and bronze vessels with inscriptions,adds a new line of evidence for studying the history of this ***,with no direct evidence,the nature of the city site is *** remains,especially a large number of sweet clover seeds,recovered from this site by systematic archaeobotanical methods provide an important source of information for research into the site's *** that modern sweet clover is superior fodder for horses and the sweet clover seeds from the Chenzhuang site coexist with chariot-horse pits and horse remains,it is suggested these sweet clover seeds might represent the fodder of battle *** suggestion supports the opinion of those who believe the Chenzhuang city site was once an important military city of the Western Zhou Dynasty in eastern china.

关键词： Early Western Zhou Dynasty military city Chenzhuang site archaeobotanic evidence carbonized sweet clover seeds

PROPER EFFICIENT SOLUTIONS AND PROPER SADDLE POINTS

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Systems Science and Mathematical Sciences 1993年第3期6卷 245-251页

作者： LI Shizheng shandong Normal University, jinan 2.0014, china

This paper offers a characterization method for the proper efficient solution ofthe multiobjective programming problem in terms of the proper saddle point and proves anecessary and sufficient condition for the equivalence between the proper efficient solutionand the associated proper saddle point by using the duality of a pair of problems.

关键词： Proper efficient solution proper saddle point dual problems strong duality

Conditions for the Formation of Oil and Gas Pools in Tertiary Volcanics in the Western Part of the Huimin Sag, shandong and Their Distribution

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 1989年第1期63卷 23-37页

作者： Liu Zerong and Xin Quanlin East china Petroleum Institute, Dongying, shandong Wang Yongjie, Xu Piqin and Zhang Xiaofeng Shengli Oilfield, Dongying, shandong Yang Shuren East china Petroleum Institute Dongying Shandong China

Conditions for the Formation of oil and gas pools in Tertiary volcanics in the western part of the Huimin sag, shandong and then (?)stribution have been studied based on the geological, seismic and well-logging information. In this paper, the types and lithofacies of the volcanic rocks in the western part of the Huimin sag are described; the relationship between rocks and electrical properties, the seismic reflection structures, the development and distribution of the volcanic rocks are expounded; and the fourfold role of the volcanic activities in the formation of the oil and gas pools is also dealt with. It is considered by the authors that the volcanic activities were not destructive to the formation of oil and gas pools but a factor favourable to the accumulation of organic matters and their conversion to hydrocarbon. The volcanic rocks might have served as reservoir rocks and cap rocks, or as a synsedimentary anticline. The prerequisites and important factors for the formation of oil and gas pools and their distribution are pointed out in the paper.

关键词： Conditions for the Formation of Oil and Gas Pools in Tertiary Volcanics in the Western Part of the Huimin Sag

STRUCTURE AND FERROMAGNETIC RESONANCE OF Fe/Cu SUPERLATTICES

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1991年第8期4卷 127-133页

作者： BI Siyun MA Xiaoding SONG Ruitian MEI Liangmo ZHAO Jiangao GUO Yicheng shandong University,jinan,china shandong Univ Jinan China

Metallic Fe/Cu superlattice films on glass substrates were prepared by a dc-magnetion sputtering *** modulation behaviors and the crystal structures of the films were ex- amined by X-ray diffraction and transmission electron microscopy(TEM)respectively. Their magnetic properties were studied by means of ferromagnetic resonnance spectrometer and the vibrating sample *** results show that there exists a strong magnetic coupling between the neighbouring Fe layers and it is the coupling that affectes the magnetic properties of these superlattice films.

关键词： superlattice ferromagnetic resonance interface spin-wave resonance

DSC　STUDY　OF　MARTENSITIC　TRANSFORMATION　KINETICS　IN　A　Cu－Zn－Al－Mn－Ni　SHAPE　MEMORY　ALLOY

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1996年第1期9卷 56-58页

作者： GENG Guili BAI Yujun PENG Qifeng(Institute for Materials Engineering,shandong University of Technology,jinan 2.0014,china) shandong Univ of Technology Jinan China

The kinetics of the reversible martensitic transformation in a Cu-Zn-Al-Mn-Ni shape memory alloy has been studied by means of differential scanning *** apparent activation energy has been calculated and the kinetic equations of positive and adverse martensitic transformation have been established with the variations of temperature and time.

关键词： shape memory alloy positive and adverse martensitic transformation phase transformation kinetics DSC study

CHARACTERIZATIONS OF PROPER EFFICIENT SOLUTIONS IN TERMS OF SADDLE POINTS AND DUALITY

在线全文

学校读者我要写书评

暂无评论

Systems Science and Mathematical Sciences 1992年第1期5卷 9-18页

作者： LI Shizheng (shandong Normal University,jinan 2.0014,china) 山东师范大学山东济南

In this paper we characterize the proper efficient solution of a mul-tiobjective programming problem(P)in terms of the saddle point criterion of anew problem(S)and establish a pair of dual problems(S_α)and(D_α)in order todecide the proper efficient solution by the strong *** also give methodof characterization in terms of the saddle point criterion of(P).Finally,we provethat every efficient solution of the matrix linear programming problem is a properefficient solution.

关键词： Efficient solution proper efficient solution saddle point criterion duality perturbation function matrix linear programming problem

STUDY ON THE TRANSPORT MECHANISM IN THE ANODE BOUNDARY LAYER OF WELDING ARGON ARC

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2001年第3期14卷 191-198页

作者： C.S. Wu and J.Q. Gao (Institute of Materials Joining, shandong University, jinan 250061, china) Inst. of Mat. Joining Shandong Univ. Jinan 250061 China

The anode region of welding arc is divided into three subzones: the anode boundary layer, the presheath and the sheath. A model is established for analyzing the transport mechanism in the anode boundary layer. The computer program is designed and the governing equations of the dominating processes with the boundary conditions taken from the solutions of LTE plasmas are solved by applying the Runge-Kutta procedure. One parameter θ, the ratio of the heavy particle temperature at the free-fall edge to the anode surface temperature, is introduced into this study. The results indicate that then the parameter θ is equal to 6, the predicted heat flux at the anode surface matches the measured one. Based on the model, various plasma properties in the boundary layer can be obtained. The calculated results are in good agreement with the measurements.

关键词： Anodes Boundary layers Electric arcs Transportation