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International Conference on Integration and Commercialization of Micro and Nanosystems 2007

作者： Li, Xinfang Zhu, Dongsheng Chen, Gang Wang, Xianju Key Lab. of Enhanced Heat Transfer and Energy Conservation Ministry of Education South China University of Technology Guangzhou 510641 China Mechanical Engineering Department Massachusetts Institute of Technology Cambridge MA 02139

ISBN: (纸本)0791842657

Dispersion and stability of Cu nano-suspensions with dispersant is the important base for the study of rheology and heat transfer enhancement of the suspensions. This paper presented a procedure for preparing a nanofluid which was a suspension consisting of nanophase powders and a base liquids. By means of the procedure, Cu-H2O nanofluids with and without dispersant were prepared, whose sedimentation photographs were given to illustrate the stability and evenness of suspension with dispersant. Dispersion and stability of Cu nanoparticles in water were studied under different pH values and the concentration of sodium dodecylbenzenesulfonate (SDBS) dispersant by the method of zeta potential, absorbency and sedimentation photographs. The results show that zeta potential has very corresponding relation with absorbency, and the higher absolute value of zeta potential and absorbency are, the better dispersion and stability in system is. The absolute value of zeta potential and absorbency are higher at pH 9.5. SDBS can significantly increase the absolute value of the zeta potential of the particle surfaces by electrostatic repulsions, which leads to the enhancement of the stability of the Cu suspensions. The optimizing concentration for SDBS in the 0.1% copper nano-suspensions is 0.07%, which has the best disperse results. Copyright © 2007 by ASME.

关键词： Nanostructured materials

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Adhesion evaluation of titanium oxides films on 316L stainless steel substrate

Adhesion evaluation of titanium oxides films on 316L stainle...

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Asian Pacific Conference for Fracture and Strength (APCFS'06)

作者： Wang, Zhihao Leng, Yongxiang Huang, Nan Zhu, Minghao School of Materials Science and Engineering Southwest Jiaotong University 610031Chengdu China Key Lab. for Advanced Technologies of Materials Ministry of Education Southwest Jiaotong University 610031Chengdu China

Titanium oxides films were deposited on tensile sample and vascular stents made of 316L stainless steel by unbalanced magnetron sputtering. The effects of structures, deposition temperature, Ti interlayer and thickness on the adhesion of titanium oxide films were investigated by tensile tests. The results revealed that the structure of the Ti-O films affect their adhesion dramatically. TiO film is brittle and fragile, lacking ability of deformation. Therefore its adhesion was worse than that of TiO2 film. The higher substrate temperature was helpful to improve adhesion of film, the adhesion of the TiO film deposited at 673K was better than those of the TiO films deposited at 323K and 473K. The adhesion of the TiO film with Ti interlayer was better than the one without interlayer. The introduction of Ti interlayer was beneficial to adhesion of film. The adhesion of thinner TiO2 film was better than that of thicker one. TiO2 film deposited on stents had good adhesion. After expansion, the film didn't crack and peel off. TiO2 film has potential application on the vascular stents for improving its blood compatibility.

关键词： Titanium oxides

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Password-based access control scheme with remote user authentication using smart cards

Password-based access control scheme with remote user authen...

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21st International Conference on Advanced Information Networking and ApplicationsWorkshops/Symposia, AINAW'07

作者： Chen, Yang Wenping, Ma Benxiong, Huang Xinmei, Wang Ministry of Education Key Lab. of Computer Networks and Information Security Xidian University Xi'an 71007 China Department of Electronics and Information Engineering Huazhong University of Sci. and Tech. Wuhan 430074 China

ISBN: (纸本)0769528473

In this paper, a bilinear mapping based passwordbased access control scheme with remote user authentication scheme using smart cards is presented. The proposed scheme enables one user to choose his password freely in the registration phase and easily change it as needed. We take the novel technique of binding one user's private key to his identity, which enables the AS (authentication server) to be unnecessary to maintain a password table to verify the login request and thus enhances the practicality and reliability of the system. Additionally, based on the difficulty of Elliptic Curve Discrete Logarithm (ECDL) problem, the proposed scheme can efficiently withstand replaying attacks, forgery attacks, Masquerade attacks, guessing and stolen verifier attacks and insider attacks. © 2007 IEEE.

关键词： Authentication

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Efficient mediated certificateless public-key encryption scheme without pairings

Efficient mediated certificateless public-key encryption sch...

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21st International Conference on Advanced Information Networking and ApplicationsWorkshops/Symposia, AINAW'07

作者： Yang, Chen Wang, Furong Wang, Xinmei Ministry of Education Key Lab. of Computer Networks and Information Security Xidian University Xi'an 71007 China Department of Electronics and Information Engineering Huazhong University of Sci. and Tech. Wuhan 430074 China

ISBN: (纸本)0769528473

It has always been a critical issue to find efficient methods for fast revocation of a user's identity in traditional ID-based cryptosystems. In this paper, we present an efficient mediated certificateless public-key encryption scheme (MCL-PKE for short) without using bilinear pairing. The proposed MCL-PKE scheme solves the inherent key escrow problem of traditional identity-based cryptosystems and provides instantaneous revocation property simultaneously. In addition, our scheme is IND-CCA secure against two types of adversaries in random oracle based on the hardness of the Computational Diffie-Hellman Problem. © 2007 IEEE.

关键词： Public key cryptography

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BASED ON SELF ORGANIZED EVOLUTIONARY ALGORITHM FOR SOLVING CONSTRAINT PROBLEM

BASED ON SELF ORGANIZED EVOLUTIONARY ALGORITHM FOR SOLVING C...

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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

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

Pan Tao Ti Hsueh Pao/Chinese Journal of Semiconductors

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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

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Preparation and mechanism of natural brucite nanofibers

Preparation and mechanism of natural brucite nanofibers

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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

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The Rewriting Algorithm for Disjunctive Queries between Peer Ontologies

The Rewriting Algorithm for Disjunctive Queries between Peer...

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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

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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...

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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

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

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

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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

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