检索结果-内蒙古大学图书馆

2007中国宁波国际计算机科学与技术学术大会

作者： Zhu Lili Zhao Kong Yuan Hua Yi Rongqin Wenzhou University School of Physics & Electronic Information Suzhou Top Institute of Information Technology Key Lab.of Symbol Computation & Knowledge Engineering of the Ministry of Education College of Computer Science & Technology Jilin University

ISBN: (纸本)9780972147903

The problem of parameterization design is equivalent to the problem of solving a set of nonlinear equations *** this paper,a new optimization algorithm—self organized evolutionary algorithm(SOEA) is proposed and applied into the parameterization *** SOEA the colony is composed of the *** organizational evolutionary operators which are split operator,mergence operator and coordination operator can lead the colony to *** three kinds of operators have different functions in the *** operator limits the scale of the organization and makes sure a part of organization comes into next generation directly,which maintains the variety of the *** operator makes use of the leader's information fully and acts as a local search *** operator increases the degree of adaptability between the two organizations by the *** experiment shows that SOEA has good capability in parameterization design.

关键词： Optimal algorithm Geometric constraint solving Self organized evolutionary algorithm

来源：评论

学校读者我要写书评

暂无评论

RTS amplitude of 90 nm MOS devices in sub-threshold region

Pan Tao Ti Hsueh Pao/Chinese Journal of Semiconductors

引用

Pan Tao Ti Hsueh Pao/Chinese Journal of Semiconductors 2007年第9期28卷 1443-1447页

作者： Bao, Li Zhuang, Yiqi Ma, Xiaohua Bao, Junlin Key Lab. of the Ministry of Education for Wide Band-Gap Semiconductor Materials and Devices School of Microelectronics Engineering Xidian University Xi'an 710071 China

Based on research on the amplitude of RTS in SMIC 90 nm CMOS nMOS 0.18μm × 0.15μm devices with a 1.4 nm gate oxide, an approach to diffusion that fits MOS operation principles better is proposed. Furthermore, a new mechanism in which a border trap changes the charge distribution of the gate and thus influences the channel current is also involved. Research shows that this method not only explains the experiment results, but also can be used to explain the distribution of RTS amplitude.

关键词： MOS devices

来源：评论

学校读者我要写书评

暂无评论

Preparation and mechanism of natural brucite nanofibers

Preparation and mechanism of natural brucite nanofibers

引用

International Conference on Integration and Commercialization of Micro and Nanosystems 2007

作者： Xu, Li Ni, Wen Yang, Xiaoguang Yang, Hailong Liu, Wei Li, Shiqing Zhao, Juncai School of Civil and Environmental Engineering University of Science and Technology Beijing Beijing China State Key Lab. of High-Efficient Mining and Safety of Metal Mines University of Science and Technology Beijing Education Ministry Beijing China

ISBN: (纸本)0791842657

Test results indicate that brucite fibers could be well dispersed by using OT as the dispersant at the water/solid ratio of 20:1, at the dosage of 15% of fiber quality and in the dispersing duration of 30 minutes. The prepared nanofibers were characterized with a scan electron microscope (SEM) and a transmission electron microscope (TEM). Test results indicate that the prepared single brucite nanofiber was around 30nm long in diameter and the talus of non-single brucite nanofibers was about 50nm-150nm long in diameter. Brucite nanofibers may be used as a fortifier for compound such as the SiO2 aerogel super insulating materials. Since brucite is also an excellent fire retardant, brucite nanofibers are expected to be used widely in the high-molecular materials sector. Copyright © 2007 by ASME.

关键词： Nanofibers

来源：评论

学校读者我要写书评

暂无评论

Thermodynamic analysis of effect on the critical drop growth radius under the presence of electric charge in the nucleus of condensation 20

Thermodynamic analysis of effect on the critical drop growth...

引用

20th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2007

作者： Guo, Ping-Sheng Liu, Hai-Li Han, Guang-Ze Hua, Ben Physics and Electronic Technology Institute Guangxi Normal University Guilin China Education Ministry's Key Lab. of Enhanced Heat Transfer and Energy Conservation Chemical Engineering Institute South China University of Technology Guangzhou China

ISBN: (纸本)9788889884089

When an electric ion is the nucleus of a water-drop condensation, the critical drop growth radius was discussed from the free energy criterion that includes electric field energy and surface tension energy, and the result shows that not only the pressure parameter, temperature parameter and surface tension parameter but also the quantity of electricity (e parameter) of an electric ion can affect the critical drop growth radius. Under the presence of electric charge in the nucleus of condensation, the critical drop growth radius rc decreases and water drop grows more easily as quantity of electricity e increases.

关键词： Free energy

来源：评论

学校读者我要写书评

暂无评论

The Rewriting Algorithm for Disjunctive Queries between Peer Ontologies

The Rewriting Algorithm for Disjunctive Queries between Peer...

引用

2007年第三届语义和知识网格国际会议(Third International Conference on Semantics,knowledge,and Grid)(SKG 2007)

作者： Biao Qin Shan Wang Dept. of Computer Science Renmin University of China Beijing 100872 China Key Laboratory of Data Engineering and Knowledge Engineering Ministry of EducationBeijing 100872 China

We study the problem of answering queries given a set of mappings between peer ontologies. In addition to the schema mapping between peer ontologies, there are axioms to give constraints to classes and properties. We propose a set of rules to build graphs for the axioms. Because the axioms have different properties, the generated graphs are classified into four sets. In each peer, its RDF/OWL query languages can support regular expressions. If it wants to be transitive along semantic paths in peer knowledge management systems, we must rewrite conjunctive and disjunctive queries between peers. Because conjunctive queries are well-understood, we focus on a novel algorithm to rewrite disjunctive queries along semantic paths based on the graphs. For all atoms of a disjunctive query, we consider its union as a set and find the maximum rewritings over peers through a graphical way. Finally we do extensive simulation experiments. The simulation results show our algorithm can generate more rewritings than the naive rewriting algorithm at each distance.

关键词： Ontologies Resource description framework OWL Terminology database languages Connectors knowledge management Extraterrestrial measurements Computer science lab.ratories

来源：评论

学校读者我要写书评

暂无评论

Preparation and wet erosive wear characteristics of porous Al 2O3 ceramics

Preparation and wet erosive wear characteristics of porous A...

引用

作者： Liang, Xiaoping Neville, A. Wang, Xiaohui Xin, Shaobo Key Lab. of Hollow Fiber Membrane Materials and Membrane Process Ministry of Education Tianjin Polytechnic University Tianjin 300160 China Department of Mechanical Engineering University of Leeds Leeds LS2 9JT United Kingdom

Porous Al2O3 ceramics were produced by a dry pressing technique and their characteristics were assessed. In terms of their microstructure the results showed that the open porosity varies with the type of pore-making agents. The open porosity is increased but fracture strength is decreased with an increase in the amount of pore-making agent. The fracture strength of Al2O3 ceramic matrix is increased by adding 5-15wt% ZrO22 particles (ZTA). In terms of their wet erosive wear characteristics the results from liquid-solid impinging jet tests can be used to determine the weak aspects of their microstructure. From examination of worn surfaces it is apparent that grain pull-out is the dominant mechanism of erosive wear. For the porous ceramics, wet erosive wear rate depends on strength, porosity and pore size. For porous Al2O3., ceramics having the same level of porosity, the larger the biggest pore size the higher the erosive wear rate. ZTA composite ceramic has a higher erosive wear resistance than that of Al2O3 ceramic with an equivalent level of porosity primarily due to its higher strength.

关键词： Ceramic materials

来源：评论

学校读者我要写书评

暂无评论

Conceptual analysis of an evaporation-baced micropump consisting of a gradient-capillary microstructure surface

Conceptual analysis of an evaporation-baced micropump consis...

引用

International Conference on Integration and Commercialization of Micro and Nanosystems 2007

作者： Du, Xiao-Ze Zhao, T.S. Key Lab. of Condition Monitoring and Control for Power Plant Equipment Ministry of Education North China Electric Power University Beijing 102206 China Department of Mechanical Engineering Hong Kong University of Science and Technology Hong Kong Hong Kong

ISBN: (纸本)0791842657

A novel micropump is proposed for delivering liquid with constant flow rates of 0-250 nl/s continuously. The liquid is pumped by the surface transpiration In a micro evaporator, which consists of a gradient capillary surface by microfabricating micropost arrays. The micropost arrays are patterned such that the gaps between microposts reduce gradually away from the center microwell to surface edge, by which a capillary force formed to pull the liquid spreading on the evaporator surface. The simple analytical model is proposed to obtain the primary characteristics of the micropump, by which the influences of geometric parameters and the contact angle of fluid on the flow rate, and also the corresponding parameters during the operation of micropump are analyzed in detail. The most striking feature of the micropump is that it can be precisely and simply controlled only by varying the surface wall temperature. A much linear relationship between the flow rate and solid wall temperature can be achieved by the present design. Other features of this novel micropump include its simplicity, no-moving-parts, and ease of controlling the temperature of biological samples. The present micropump concept may be potentially used in delivering a precisely-controlled, continuous flow rate for many new applications in the fields of biotechnology, environmental testing, and instrumentation for analytical chemistry. Copyright © 2007 by ASME.

关键词： Pumps

来源：评论

学校读者我要写书评

暂无评论

Dissolution ability and rheological properties of different kinds of cellulose dissolved in NaOH/thiourea/urea Aqueous Solution

引用

2007 International Conference on Advanced Fibers and Polymer Materials, ICAFPM 2007

作者： Cheng, Fengwei Zhang, Shuai Huang, Liqian Li, Faxue Yu, Jianyong Gu, Lixia College of Textiles Donghua University Shanghai 201620 China Key Lab. of Textile science and Technology Ministry of Education China Modern Textile Institute Donghua University Shanghai 200051 China College of Material Science and Engineering Donghua University Shanghai 201620 China

ISBN: (纸本)9787122012234

The novel aqueous solvent of cellulose which contains NaOH, thiourea and urea, was discussed furtherly in this article. At the temperature when long, needle-like crystals precipitated from the solvent, the dissolving of cellulose in the solvent was best. IR spectrum showed that the precipitated crystals were Thiourea itself, not others or their mixture. Dissolution of different kinds of pulps (cotton, wood, bamboo and rice straw) were observed under polarized optical microscope and highest soluble concentration of the pulps were 6.1%, 4.2%, 2.1% and 4.3% respectively. The rheological property of the clear cellulose solutions were studied by ARES. They exhibited very different viscosities, module characters and gelation temperatures.

关键词： Urea

来源：评论

学校读者我要写书评

暂无评论

Time on the performance of ceramic ball grinding media prepared from refractory waste

Time on the performance of ceramic ball grinding media prepa...

引用

作者： Zhong, L.Y. Wu, B.L. Zhang, L.M. Song, J.G. State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Key Lab. of Nonferrous Materials and New Processing Technology Guilin University of Technology Ministry of Education Guilin Guangxi 541004 China Department of Materials and Chemical Engineering Guilin University of Technology Guilin 541004 China

Aluminosilicate refractory waste was used to prepare high performance ceramic ball grinding media with 75% Al2O3. The influence of milling time on the particle size of raw materials, the sintering temperature, and performance of ceramic balls were studied. Results show that with increasing milling time the particle size of the raw materials decreased, resulting in a decrease of ceramic ball sintering temperature and an increase in wear resistance and volume density. The wear rate and volume density of balls prepared by milling the materials for 72 h were 0.01886 %/h and 3.374 g/cm 3, respectively.

关键词： Grinding (machining)

来源：评论

学校读者我要写书评

暂无评论

Apatite formation on the surface of dense HA/TCP in animals' serums

Apatite formation on the surface of dense HA/TCP in animals'...

引用

作者： Deng, Chunlin Wang, Yingjun Wu, Yao Qin, Yingde Fan, Hongsong Chen, Jiyong Zhang, Xingdong Key Lab. of Specially Functional Materials and Advanced Manufacturing Technology Ministry of Education Guangzhou China Engineering Research Center in Biomaterials Sichuan University Chengdu China Biomaterials Research Institute South China University of Technology Guangzhou China College of Material and Bioengineering Chengdu University of Technology Chengdu China

Dense HA/TCP bioceramics were immersed in pure bovine serum, rabbit serum and dog serum to observe apatite formation. Deposited crystals were examined using SEM. Results showed that some needle-like crystals formed on surface of sterilized HA/TCP, and needle crystals developed into sheet crystals and stick crystals after ceramics were immersed in bovine serum and rabbit serum respectively. The growth of crystals was maybe affected by the content of calcium, various kinds of albumen and alkaline phosphatase in different serums and the different pH of serum.

关键词： Bioceramics

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：