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2012 IEEE Photonics Society Summer Topical Meeting Series, PSST 2012

作者： Zhang, Liang Fan, Shu-Hao Liu, Cheng Zhu, Ming Hu, Xiaofeng Li, Zhihua Su, Yikai Chang, Gee-Kung State Key Lab. of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332-0250 United States

We propose and demonstrate a cost-effective wireless over optical fiber access system using frequency quintupling technique. A 2.5-Gb/s OOK signal at 60-GHz is successfully transmitted through 30-km SSMF and 10-ft air... 详细信息

ISBN: (纸本)9781457715266

关键词： Optical fibers

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Deactivation and in situ regeneration of anion exchange resin in the continuous transesterification for biodiesel production

Deactivation and in situ regeneration of anion exchange resi...

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作者： He, Benqiao Ren, Yanbiao Cheng, Yu Li, Jianxin State Key Lab of Hollow Fiber Membrane Materials and Processes School of Materials Science and Engineering Tianjin Polytechnic University Tianjin 300160 China Laboratory of Membrane Materials and Separation Engineering Technology Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201203 China

The deactivation and in situ regeneration of anion exchange resin (D261) used as a catalyst in the continuous transesterification of soybean oil with methanol for biodiesel production were studied in a fixed-bed reactor. The chemical and physical structures of the resins were investigated by means of X-ray photoelectron spectrometer (XPS), N2 adsorption/desorption isotherms, and scanning electron microscope (SEM). The results showed that biodiesel conversion was over 90% within the run time of 4 h but rapidly declined to 23.7% after 8 h. The fouling of organic substances (triglyceride and glycerol) covered on the resin was the main reason leading to the decrease in the biodiesel conversion. The fouling extent on the resin was related to the resin position in the fixed bed. The largest activity loss of the resin occurred at the bottom of the fixed bed. The leakage of OH- groups from the resins, independent of the resin height in the bed, also resulted to the decline of the resin activity. An in situ regeneration method was put forward. The resin regenerated can be restored to the original catalytic activity to perform continuous transesterification for biodiesel production. © 2012 American Chemical Society.

关键词： Transesterification

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Pattern mining, semantic label identification and movement prediction using mobile phone data

Pattern mining, semantic label identification and movement p...

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8th International Conference on advanced Data Mining and Applications, ADMA 2012

作者： Xie, Rong Luo, Jun Yue, Yang Li, Qingquan Zou, Xiaoqing International School of Software Wuhan University Wuhan 430079 China Shenzhen Institutes of Advanced Technology CAS Shenzhen 518055 China Shenzhen Key Laboratory of High Performance Data Mining Shenzhen 518055 China Shenzhen University Shenzhen China State Key Lab. of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University Wuhan 430079 China Faculty of Land Resource Engineering Kunming University of Science and Technology Kunming China

ISBN: (纸本)9783642355264

Data collected from mobile phones have potential knowledge to provide with important behavior patterns of individuals. In this paper, we present approaches to discovering personal mobility and characteristics based on mobile phone location information and semantic analysis. We discuss three aspects related to very common mobile phone-related applications such as pattern mining, semantic label identification and movement prediction. We use real mobile phone data to perform functions of discovering these behavior patterns and demonstrate effectiveness of our approaches. © Springer-Verlag 2012.

关键词： Cellular telephones

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Mesh Reconstruction technology of Welding Process in 3D FEM Simulation of Porthole Extrusion and Its Application

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Procedia engineering 2012年 36卷 253-260页

作者： Zhi-hao Zhang Wen-rong Hou Dong-nan Huang Jian-xin Xie Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing 100083 PR China State Key Lab for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 PR China School of Materials Science and Engineering Inner Mongolia University of Technology Hob. hot 010051 PR China

For extrusion of hollow profile with asymmetric cross-section, existing FEM software cannot simulate the influence of divergent and welding on the metal flowing behaviors, because it is inability to deal with meshes separation and penetration during welding. A mesh-reconstruction technology based on the reverse engineering is proposed in this paper, and extrusions of Al-alloy hollow profiles with various cross-sections are simulated. The results show that the mesh-reconstruction technology can solve the problem of simulation termination caused by the meshes separation and penetration during porthole die extrusion. It is effective to analyze the metal flowing behaviors, temperature distribution, hydrostatic stress in weld-chamber, and stress on dies, which provides a practicable way for die structure design and optimization of porthole extrusion as well as quality forecast of extrusion products.

关键词： Porthole extrusion mesh reconstruction FEM Al-alloy

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Applications of Embedded HVDC in Power System Transmission

Applications of Embedded HVDC in Power System Transmission

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Power engineering and Automation Conference

作者： Jicheng Yu George G. Karady Lei Gu School of Electrical Computer and Energy Engineering Arizona State University State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

ISBN: (纸本)9781457715983

High Voltage Direct Current (HVDC) technology has been widely recognized advanced in power transmission. Classical HVDC has shown its advanced features in long distance bulk power delivery, submarine cable crossings, and asynchronous interconnections. Therefore, the new generation of technology, embedded HVDC, is further broadening the range of applications of HVDC transmission. The embedded HVDC is beneficial to all traditional occupations. Meanwhile, perspective novel applications, which are involved in offshore transmissions, infeed large urban areas, DC segment grid, and weak AC system connections, come into service. The installation of the embedded HVDC systems on the existing AC power grid may largely improve the transient stability and power flow oscillation damping factor of power transmission system.

关键词： Embedded HVDC VSC IGBT Power Transmission Asynchronous Interconnection HVDC Applications

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Organozinc compounds as effective dielectric modification layers for polymer field-effect transistors

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advanced Functional Materials 2012年第19期22卷 4139-4148页

作者： Xu, Xinjun Liu, Bo Zou, Yingping Guo, Yunlong Li, Lidong Liu, Yunqi State Key Lab for Advanced Metal and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China College of Chemistry and Chemical Engineering Central South University Changsha 410083 China National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China

The interface between the organic semiconductor and dielectric plays an important role in determining the device performance of organic field-effect transistors (OFETs). Although self-assembled monolayers (SAMs) made from organosilanes have been widely used for dielectric modification to improve the device performance of OFETs, they suffer from incontinuous and lack uniform coverage of the dielectric layer. Here, it is reported that by introduction of a solution-processed organozinc compound as a dielectric modification layer between the dielectric and the silane SAM, improved surface morphology and reduced surface polarity can be achieved. The organozinc compound originates from the reaction between diethylzinc and the cyclohexanone solvent, which leads to formation of zinc carboxylates. Being annealed at different temperatures, organozinc compound exists in various forms in the solid films. With organozinc modification, p-type polymer FETs show a high charge carrier mobility that is about two-fold larger than a control device that does not contain the organozinc compound, both for devices with a positive threshold voltage and for those with a negative one. After organozinc compound modification, the threshold voltage of polymer FETs can either be altered to approach zero or remain unchanged depending on positive or negative threshold voltage they have. A solution-processed organozinc compound is utilized as a dielectric modification layer in polymer field-effect transistors to improve the surface morphology and to reduce the surface polarity. Enhanced charge carrier mobility is achieved. The organozinc compound originates from the reaction between diethylzinc and the cyclohexanone solvent, which leads to formation of zinc carboxylates. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Organic field effect transistors

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Phase evolution of tantalum nitride and tantalum carbide films with PBII parameters

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Rare Metals 2011年第2期30卷 142-145页

作者： LI Zhongwen GU Le TANG Guangze MA Xinxin SUN Mingren WANG Liqin School of Materials Science ＆ Engineering Harbin Institute of Technology Harbin 150001 China School of Mechatronics Engineering Harbm Institute of Technology Harbin 150001 China State Key lab of Advanced Welding Production Technology Harbin Institute of Technology Harbin 150001 China

Tantalum nitride and tantalum carbide films were fabricated using magnetron sputtering of tantalum followed by nitrogen and carbon plasma-based ion implantation （N-PBII and C-PBII）. The phase evolution and morphology of the films were studied using glancing angle X-ray diffraction （GXRD） and transmission electron microscopy （TEM）. It was found that the main phase in the tantalum nitride films was crystalline TaNo.1 whose grain size increases with increasing implantation voltage and phase content increases with increasing implantation dose. In the tantalum carbide film, the main phase was Ta2C. TaC phase also appeared as the implantation dose increased. XRD results from various glancing angles show that the phases with high nitrogen or carbon content, Ta4N5 and TaC, are present in the surface of the films. X-ray photoelectron spectra （XPS） from the tantalum carbide film reveal that the surface carbon content is higher than that of the inner film.

关键词： thin films tantalum nitride tantalum carbide phase composition magnetron sputtering ion implantation

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Effect of austenitizing temperature on microstructure in 16Mn steel treated by cerium

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International Journal of Minerals,Metallurgy and Materials 2011年第6期18卷 652-658页

作者： Bin Wen Bo Song Ning Pan Qing-yun Hu Jing-hong Mao State Key Lab of Advanced Metallurgy University of Science and Technology Beijing Beijing 100083 China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

The change of inclusions and microstructure of 16Mn steel treated by Ce were observed,and the effect of austenitizing temperature on the microstructure was also *** results show that the inclusions are transformed from Si-Mn-Al composite oxide and MnS into AlCeO3,Ce2O2S,and MnS composite inclusions after being treated by *** of intragranular ferrites are formed in 16Mn steel containing～0.017wt% Ce.A large amount of intragranular acicular ferrites are formed after being austenitized for 20min at 1473 *** prior austenite grain size fit for the formation of intragranular acicular ferrites is about 120μm.

关键词： steel metallurgy inclusions ferrite austenite grain size

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Predicting the electric conductivity of solid solutions in SrTiO3-La0.3Sr0.7TiO3- (La0.3Sr0.7)0.93TiO3 system by a mass triangle model

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 2012年第12期34卷 1405-1409页

作者： Li, Xue Zhao, Hai-Lei Luo, Da-Wei Zhou, Guo-Zhi School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China National Key Lab of Metamaterial Electromagnetic Modulation Technology Shenzhen Kuang-Chi Institute of Advanced Technology Shenzhen 518057 China School of Applied Chemistry and Biotechnology Shenzhen Polytechnic Shenzhen 518055 China

The constant electric conductivity curves of solid solutions in the SrTiO3-La0.3Sr0.7TiO3- (La0.3Sr0.7)0.93TiO3 ternary system were obtained by estimating the electric conductivity of the solid solutions by a mass triangle model. Some typical compositions of the solid solutions were selected to verify the calculated results. The experimental values are consistent well with the predicted ones, demonstrating the feasibility of a mass triangle model in predicting the electric conductivity of mixed conductor.

关键词： Ceramic materials

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Power flow unsolvable cases adjustment method based on grid static voltage stability

Power flow unsolvable cases adjustment method based on grid ...

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2011 International Conference on advanced Power System Automation and Protection, APAP 2011

作者： Hong, Feng Chen, Jinfu Zuo, Jian State Key Laboratory of Advanced Electromagnetic Engineering and Technology Electrical Power Security and High Efficiency Lab. Huazhong University of Science and Technology 430074 Wuhan China

ISBN: (纸本)9781424496198

The unsolvable power flow problem is one of the basic issues in dispatching automation, which frequently appears in the process of grid mode planning and Optimal Power Flow (OPF) analysis. To deal with this problem, a practical adjustment method based on grid weak point is proposed in this paper. This method use "lower power injection" method to calculate a similar power flow solution which also the system maximum load level in unsolvable case. According this solution, the system weak point can be found by the index based on local system operation parameters and external equivalent system model. Combined with sensitivity analysis to reschedule the active power of generators and reactive power compensation devices, so as to make the system maximum load level increase, eventually get the system power flow solution at the original load level. This method overcome the large calculation of optimize algorithm in unsolvable power flow problem and can be applied to large practical grid. In the meantime, this method has clear physical interpretation, operator can be involved during the process, have great value in application. The method is tested on IEEE14 nods system. © 2011 IEEE.

关键词： Sensitivity analysis

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