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2010 International Conference on Microwave and Millimeter Wave technology, ICMMT 2010

作者： Shen, Wei Yin, Wen-Yan Sun, Xiao-Wei Wu, Lin-Sheng Center for Microwave and RF Technologies School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai 200240 China Center for Optical and Electromagnetic Research State Key Lab. of MOI Zhejiang University 310058 China Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

ISBN: (纸本)9781424457052

A novel Nth-order microstrip filter with N+2 transmission zeros using two dual-mode resonators is presented in this paper. Two different coupling schemes are obtained by changing couplings between dual-mode resonators and ports. Then, two fourth- and second-order filter characteristics with three and four transmission zeros are obtained correspondingly. The generation mechanism of transmission zeros is interpreted in detail by coupling matrix theory. A microstrip dual-mode filter is designed and fabricated, with good agreement achieved between the measured and the simulated S-parameters. © 2010 IEEE.

关键词： Bandpass filters

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Fine-structured TiO2 ceramic patterns on the ceramic surface fabricated by replication

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IOP Conference Series: Materials Science and engineering 2011年第1期20卷

作者： H D Kim T Nakayama B J Hong K Imaki T Yoshimura T Suzuki H Suematsu S W Lee Z Fu K Niihara Extreme Energy-Density Research Institute Nagaoka University of Technology 1603-1 Kamitomioka Nagaoka 940-2188 Japan Department of Physics and Electronics Graduate School of Engineering Osaka Prefecture University 1-1 Gakuencho Nakaku Sakai 599-8531 Japan Department of Environmental Engineering Sun Moon University Chungnam 336-708 Korea State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The ability to fabricate high precision micro- to nanoscale structure in a wide variety of materials is of crucial importance for the advancement of microtechnology, nanotechnology and nanoscience. Also, the ability to create micrometer and sub-micrometer architecture for functional ceramics is a prerequisite of exploring the rich field of ceramic nanotechnology. In this work we fabricated three-dimensional oxide ceramic materials with fine-structure over multiple length scales by combining replication patterning technique, polyvinyl alcohol (PVA), oxide ceramic material (TiO2) nano-sized particles. Our study is based on the idea that PVA can be easily detached from a mold by peeling. We confirmed that micron and sub-micron-sized fine-structured oxide ceramic patterns containing nano-sized pores could be fabricated using this procedure. The results presented demonstrate the compositional and structural diversities that are possible with a facile approach and simple method.

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Compact substrate integrated waveguide (SIW) transversal filter with triple-mode microstrip resonator

Compact substrate integrated waveguide (SIW) transversal fil...

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作者： Shen, Wei Yin, Wen-Yan Sun, Xiao-Wei Mao, Jun-Fa Center for Microwave and RF Technologies School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai 200240 China Center for Optical and Electromagnetic Research State Key Lab of MOI Zhejiang University 310058 China Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

ISBN: (纸本)9784902339222

A novel fourth-order substrate integrated waveguide (SIW) transversal filter with triple-mode microstrip resonator is presented. The triple-mode resonator is etched on the top metal layer of SIW cavity, so compact size can be achieved. The coupling scheme of filter exhibits transversal characteristic, and the design principle of the filter is simple. The filter has compact size and wide stopband in comparison with conventional SIW filters. An open stub was added on the port to get better frequency selectivity. Two SIW filter samples are designed and fabricated, with good agreement achieved between the measured and the simulated S-parameters. © 2010 IEICE Institute of Electronics Informati.

关键词： Bandpass filters

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Study of MEMS Self-Assembly Using Molten Solder Ball

Study of MEMS Self-Assembly Using Molten Solder Ball

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2010 11th International Conference on Electronic Packaging technology & High Density Packaging(2010 电子封装技术与高密度封装国际会议)

作者： Chunqing Wang Lei Yang Wei Liu Yang Li State Key Lab of Advanced Welding Production Technology School of Materials and Engineering Harbin The 13th Research Institute of China Electronics Technology Group Corporation Shijiazhuang 050051

MEMS solder self-assembly technique can assemble the quasi-three-dimensional microstructures to the final threedimensional devices using the surface tension of the molten solder. A model based on the minimum surface energy principle has been developed. Experimental studies are conducted to verify the model. It is shown that the final rotating angle matches well with the predicted angle, and the error is less than ±3o. By analyzing the impact of factors on the solder self-assembly process, the parameter K and the pad aspect ratio P_k were determined as the dominant factors. Finally, the influencing regularities of the dominant factors affecting the equilibrium angles are obtained with further studies.

关键词： Self-assembly Torque Micromechanical devices Assembly Shape Surface tension Analytical models

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Microstructure and mechanical properties of ferrite/martensite dual-phase steel

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Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment 2010年第1期31卷 29-34页

作者： Zuo, Xiu-Rong Chen, Yun-Bo Wang, Miao-Hui Li, Yong Wang, Hong-Yan Wang, Zhen-Wei Advanced Manufacture Technology Center State Key Lab of Advanced Forming Technology and Equipment China Academy of Machinery Science and Technology Beijing 100083 China Key Laboratory of Material Physics School of Physical Science and Engineering Zhengzhou University Zhengzhou 450052 China

Microstructure and mechanical properties of dual phase steel with ferrite and martensite were studied by means of optical microscope(OM), scanning electromicroscopy(SEM) and tensile tests. The results show that for the steel with type A microstructure of ferrite and pearlite and type B microstructure of martensite, the strength increases with increasing intercritical quenching temperature in the range of 785~800 °*** differences of their inital microstructure result in the differences of the final microstructure and mechanical properities of the intercritically quenched steel. Strength of the quenched steel with type B microstructure is higher than that with type A microstructure after intercritical quenching at 785 °C for 30 min. Elongation and reduction of the steel with type B microstructure are higher than that with type A microstructure when the steel is intercritical quenching at 800 °C for 30 min. Austeniting process is accelerated in the steel with microstructure of type B compared to type A for intercritical quenching at 785 °C for 10 min, which results in higher strength and plasticity of the former than the latter. Dual-phase steel with the microstructure of martensite and ferrite exhibits high strength and hardening rate, continuous yielding and low yield ratio. Steel intercritically quenched at 785 °C for 30 min possesses lower plasticity and much higher strength than that quenched and tempered. The steel with type B microstructure after intercritically quenched at 785 °C for 10 min exhibits a little lower strength and slightly higher plasticity compared to that of the steel quenched and tempered.

关键词： Microstructure

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Highly Efficient Blue-light-emitting Polymers Containing Cyano Groups and Carbazole-triphenylamines:Synthesis,Characterization and their PLED Application

Highly Efficient Blue-light-emitting Polymers Containing Cya...

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全国第八届有机固体电子过程暨华人有机光电功能材料学术讨论会

作者： Ying Lin Zhikuan Chen Tengling Ye Yanfeng Dai Dongge Ma Zhun Ma Qinde Liu Yu Chen Institute of Materials Research and Engineering 3 Research Link Singapore 117602 Institute of Materials Research and Engineering 3 Research Link Singapore 117602 State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences Graduate School of the Chinese Academy of Sciences Changchun 130022 Key Lab for Advanced Materials Department of Chemistry East China University of Science and Technology 130 Meilong Road Shanghai 200237 State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences Graduate School of the Chinese Academy of Sciences Changchun 130022 Key Lab for Advanced Materials Department of Chemistry East China University of Science and Technology 130 Meilong Road Shanghai 200237 Key Lab for Advanced Materials Department of Chemistry East China University of Science and Technology 130 Meilong Road Shanghai 200237

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Hybrid information retrieval policies based on cooperative cache in mobile P2P networks

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中国高等学校学术文摘·计算机科学 2009年第3期3卷 381-395页

作者： Quanqing XU Hengtao SHEN Zaiben CHEN Bin CUI Xiaofang ZHOU Yafei DAI State Key Lab for Advanced Optical Communication System & Networks Peking University Beijing 100871 China School of Information Technology and Electrical Engineering The University of Queensland Brisbane Australia

The concept of Peer-to-Peer (P2P) has been in-troduced into mobile networks, which has led to the emer-gence of mobile P2P networks, and originated potential ap-plications in many fields. However, mobile P2P networks are subject to the limitations of transmission range, and highly dynamic and unpredictable network topology, giving rise to many new challenges for efficient information retrieval. In this paper, we propose an automatic and economical hybrid information retrieval approach based on cooperative cache. In this method, the region covered by a mobile P2P network is partitioned into subregions, each of which is identified by a unique ID and known to all peers. All the subregions then constitute a mobile Kademlia (MKad) network. The pro-posed hybrid retrieval approach aims to utilize the flooding-based and Distributed Hash Table (DHT)-based schemes in MKad for indexing and searching according to the designed utility functions. To further facilitate information retrieval, we present an effective cache update method by considering all relevant factors. At the same time, the combination of two different methods for cache update is also introduced. One of them is pull based on time stamp including two different pulls: an on-demand pull and a periodical pull, and the other is a push strategy using update records. Furthermore, we provide detailed mathematical analysis on the cache hit ratio of our approach. Simulation experiments in NS-2 showed that the proposed approach is more accurate and efficient than the existing methods.

关键词： peer-to-peer (P2P) flooding mobile Kadem-lia hybrid information retrieval cache update cache con-sistency

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Effect of polyethylenimine on morphology and photovoltaic property of ZnO nanowire array films

Beijing Keji Daxue Xuebao/Journal of University of Science a...

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Beijing Keji Daxue Xuebao/Journal of University of Science and technology Beijing 2010年第1期32卷 78-82页

作者： Yang, Wei-Guang Wan, Fa-Rong Jiang, Chun-Hua Chen, Si-Wei School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Beijing Key Lab of Advanced Energy Material and Technology Beijing 100083 China State Approved Technology Center IRICO Group Corp Beijing 100085 China

The effect of polyethylenimine (PEI) concentration on the morphology, wire density and size of ZnO nanowire arrays was systematically studied by X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscope (SEM). The photovoltaic properties of ZnO nanowire array films were also investigated. It is demonstrated that, for a ZnO nanowire array film obtained from 7.3mmol·L-1 PEI, an energy conversion efficiency of about 0.66% was obtained, which is the highest for ZnO nanowire array films prepared with different PEI concentrations from 3.2mmol·L-1 to 9.3mmol·L-1.

关键词： Dye-sensitized solar cells

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A novel four-node quadrilateral element with continuous nodal stress

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Applied Mathematics and Mechanics(English Edition) 2009年第12期30卷 1519-1532页

作者：唐旭海郑超吴圣川张建海 State Key Lab of Hydraulics and Mountain River Engineering Sichuan University Centre for Advanced Materials Joining and Computations(AMJC) School of Materials Science and Engineering Hefei University of Technology Centre for Advanced Computations in Engineering Science(ACES) Department of Mechanical Engineering National University of Singapore

Formulation and numerical evaluation of a novel four-node quadrilateral element with continuous nodal stress（Q4-CNS）are presented.Q4-CNS can be regarded as an improved hybrid FE-meshless four-node quadrilateral element（FE-LSPIM QUAD4）, which is a hybrid FE-meshless *** of Q4-CNS are continuous at nodes, so the continuous nodal stress can be obtained without any smoothing *** is found that,compared with the standard four-node quadrilateral element（QUAD4）,Q4- CNS can achieve significantly better accuracy and higher convergence *** is also found that Q4-CNS exhibits high tolerance to mesh ***,since derivatives of Q4-CNS shape functions are continuous at nodes,Q4-CNS is potentially useful for the problem of bending plate and shell models.

关键词： Q4-CNS four-node quadrilateral element partition of unity continuousnodal stress accuracy mesh distortion

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A novel virtual node method for polygonal elements

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Applied Mathematics and Mechanics(English Edition) 2009年第10期30卷 1233-1246页

作者：唐旭海吴圣川郑超张建海 State Key Lab of Hydraulics and Mountain River Engineering Sichuan University Centre for Advanced Materials Joining and Computations (AMJC) School of Materials Science and EngineeringHefei University of Technology Centre for Advanced Computations in Engineering Science (ACES) Department of Mechanical EngineeringNational University of Singapore

A novel polygonal finite element method （PFEM） based on partition of unity is proposed, termed the virtual node method （VNM）. To test the performance of the present method, numerical examples are given for solid mechanics problems. With a polynomial form, the VNM achieves better results than those of traditional PFEMs, including the Wachspress method and the mean value method in standard patch tests. Compared with the standard triangular FEM, the VNM can achieve better accuracy. With the ability to construct shape functions on polygonal elements, the VNM provides greater flexibility in mesh generation. Therefore, several fracture problems are studied to demonstrate the potential implementation. With the advantage of the VNM, the convenient refinement and remeshing strategy are applied.

关键词： virtual node method polygonal finite element method partition of unity crack propagation

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