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Large current lightning mimic test for FRP blades of wind turbine generators

IEEJ Transactions on Power and Energy 2007年第3期127卷 531-536页

作者： Hanai, Masahiro Ikeda, Hisatoshi Nakadate, Masumi Sakamoto, Haruo Power and Industrial Systems Research and Development Center Toshiba Corporation Power Systems Company 2-1 Ukisima-Cho Kawasaki-ku Kawasaki 210-0014 Hamakawasaki Works Toshiba Corporation Power Systems Company 2-1 Ukisima-Cho Kawasaki-ku Kawasaki 210-0014 Department of Intelligent Mechanical System Engineering Kochi University of Technology Miyanoguchi Tosayamada-Cho Kami 782-8502 Toshiba Corporation Kochi University of Technology

In Japan, lightning damage to FRP blades of wind turbine generators has been increasing in parallel with the recent increase in the installation of wind turbine generators. Therefore, we established a test method, while clarifying the destructive climate of lightning, and examined a method of preventing destruction. A high-voltage test clearly showed that lightning easily penetrates FRP that is not processed to be conductive. More-over, after developing a test method, an examination with a large current successfully reproduced blade damage, and revealed the failure mechanism, which explains breakdowns of actual machines. If lightning penetrates a FRP blade, the air temperature inside the blade rises. As a result, pressure increases and the blade is damaged. Moreover, the breakdown of positive polarity (winter) lightning can be examined with a large current that is generated by a short circuit generator.

关键词： Electric generators

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Common mode voltage evaluation for choosing quiet MCU and optimizing PCB design electromagnetic emissions measurement for integrated circuits

Common mode voltage evaluation for choosing quiet MCU and op...

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IEEE International Symposium on Electromagnetic Compatibility, EMC 2007

作者： Nakamura, Atsushi Mabuchi, Yuichi Jisso Technology Development Dept. Renesas Technology Corp. 5-20-1 Jyosuihon-cho Kodaira-shi Tokyo 187-8588 Japan Advanced Motor and Drive System R and D Center Hitachi Research Laboratory Hitachi Ltd. 7-1-1 Omika-cho Hitachi-shi Ibaraki-ken 319-1292 Japan

ISBN: (纸本)1424413508

Similar to the fact that the differential signaling interfaces radiate less amount than the typical single ended interfaces, radiation from wire harness connected to electronic control units using single chip micro computers can be reduced by adjusting the common mode voltage fluctuation of supply lines. The radiation from wire harness can be minimized when the Vcc and the Vss fluctuate with same magnitude in opposite phase. As estimating these fluctuations of real products using lots of components on complex PCB layout by simulation technique is quite difficult at this moment, alternative solution to investigate the common mode voltage fluctuation has been investigated. By the Workbench Faraday cage method and advanced usage of it with 180deg four ports hybrid balun, common mode voltage fluctuations of Vcc and Vss with phase information can be monitored. Examples of this measured data are discussed and a way of reducing common mode radiation from wire harness is explained. © 2007 IEEE.

关键词： Integrated circuits

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An Efficient CQI Feedback Scheme for Multiuser MIMO systems

An Efficient CQI Feedback Scheme for Multiuser MIMO Systems

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IEEE Conference on Vehicular technology (VTC)

作者： Myeon-Gyun Cho Youngju Kim Youngsoo Kim Daesik Hong 4G System Development Team Telecommunication Research and Development Center Samsung Electronics Company Limited Suwon South Korea Center for Information Technology Information and Telecommunication Laboratory Yonsei University Seoul South Korea

An opportunistic scheduling is adopted to improve the capacity of the system by exploiting the multiuser diversity of multiuser MIMO (MU-MIMO) systems. However, it requires a large amount of feedback carrying the channel quality information (CQI) of each user to the transmitter. The considered per user unitary and rate control (PU 2 RC) needs to feedback the preferred preceding index and its CQIs, and it has a defect in scheduling the streams for the grouped user. In order to overcome these drawbacks, a novel feedback reduction scheme is proposed and is modified for OFDMA systems in this paper. It employs transmitter controlled preceding and opportunistic feedback (TCP-OFB) in conjunction with frequency scheduling. The simulation results demonstrate that TCP-OFB/OFDMA shows comparable performance to PU 2 RC while it only requires far reduced feedback load.

关键词： Feedback MIMO Transmitters Scheduling Multiaccess communication Radio control Access protocols research and development Information technology Cities and towns

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Numerical analysis of the unsteady cavitating flow in a 2D-cascade and a 3D-inducer

Numerical analysis of the unsteady cavitating flow in a 2D-c...

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43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference

作者： Ugajin, Hiroki Kawai, Masafumi Okita, Kohei Ohta, Takashi Kajishima, Takeo Nakano, Masataka Tomaru, Hiroshi IHI Corporation Tokyo 190-1297 Japan IHI Corporation Yokohama 235-8501 Japan RIKEN Wako Saitama 113-8656 Japan Osaka University Osaka 565-0871 Japan Space Technology Group Research and Engineering Division Aero-Engine and Space Operations 229 Tonogaya Mizuho-machi Nishitama-gun AIAA Fluid Group Research Laboratory Functionality Simulation and Information Team VCAD System Research Program Center for Intellectual Property Strategies Department of Mechanical Engineering Space Technology Group Research and Engineering Division Aero-Engine and Space Operations

ISBN: (纸本)1563479036

The unsteady cavitating flow in a turbopump inducer has been analyzed using CFD simulation results. An accurate three-dimensional detached eddy simulation (DES) code which took into account the cavitating phenomena was used. The three-dimensional code is based on the numerical method for compressible flow using low Mach number flow approximation. The cavitation is modeled by the source/sink of vapor phase in the liquid flow. The code has been applied for cavitating flows in both a 2D cascade and a 3D inducer. The computational results showed similar unsteady behaviors to experimental measurements in terms of the direction in cavity propagations and tendency in cavity developments. Mechanism for the unsteady cavitating flow such as rotating cavitation is investigated by analyzing the numerical results. One model is proposed to describe the reason why the cavity appears to propagate in the forward direction.

关键词： Unsteady flow

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Mentornet's Wisconsin and Hawaii statewide initiatives

Mentornet's Wisconsin and Hawaii statewide initiatives

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114th Annual ASEE Conference and Exposition, 2007

作者： Wellenstein, Mary Jo Courter, Sandra Sandrin, Susannah Showers, Karen Wilkins, Leslie Muller, Carol Chou-Green, Jennifer Bloor, Ann Mayberry, Laurie Yap, Isla Milwaukee School of Engineering United States University of Wisconsin Madison United States University of Wisconsin Oshkosh United States Wisconsin Technical College System United States Maui Economic Development Board United States MentorNet United States Department of Counseling Services MSOE United States Engineering Learning Center United States Department of Engineering Professional Development University of Wisconsin System Women Science Program United States UW-Oshkosh United States WTCS Maui Economic Development Board HI United States Research Administration MSOE United States Provost University of Wisconsin Madison United States Women in Technology Project Maui Economic Development Board United States

The state of Wisconsin and state of Hawaii are the only states in the nation to have offered MentorNet membership to all public universities and technical colleges. This innovative partnership highlights a new model to launch MentorNet on college campuses. MentorNet, the E-Mentoring Network for Diversity in Engineering and Science and an award-winning nonprofit e-mentoring organization, offers a proven effective means to connect students (protégés) in science, technology, engineering, and math (STEM) majors with professionals (mentors) in industry, government and higher education. Since mentoring is recognized as an important engagement strategy to encourage women and girls to pursue STEM education and careers, other states can benefit from the story of the Wisconsin and Hawaii collaboration. Hawaii's Maui Economic development Board and Wisconsin's Milwaukee School of Engineering have partnered under a Women in technology grant from the U.S. Department of Agriculture Cooperative State research, Education, and Extension Service. This grant is to encourage women and girls in rural areas to pursue STEM education and careers. Because students at the Hawaii and Wisconsin partner campuses were enthusiastic about their MentorNet experience, the Women in technology grant funded a two-year contract to waive membership fees for MentorNet for all four-year and two-year University of Wisconsin system and Wisconsin Technical College system campuses;30 institutions could potentially participate. One of the aims of this program was to encourage more technical/community colleges to partner with MentorNet, broadening the range of mentoring opportunities for the diverse population of students who attend such schools. To promote MentorNet participation in the Wisconsin systems, a collaborative team from Hawaii, Milwaukee School of Engineering, MentorNet, the University of Wisconsin system, and the Wisconsin Technical College system held a one-day orientation training in August 2005. A

关键词： Engineering education

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The detailed Analysis of field emission under Stabilized Operation using field effect transistor

The detailed Analysis of field emission under Stabilized Ope...

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Technical Digest of the 20th International Vacuum Nanoelectronics Conference, IVNC 07

作者： Neo, Yoichiro Matsumoto, Takahiro Shimawaki, Hidetaka Mimura, Hidenori Yokoo, Kuniyoshi Research Institute of Electronics Shizuoka University 3-5-1 Johoku Hamamatsu 432-8011 Japan Research and Development Center Stanley Electric Corporation 5-9-5 Tokodai Tsukuba 300-2635 Japan Department of System and Information Engineering Hachinohe Institute of Technology 88-1 Ohbiraki Myo Hachinohe 031-8501 Japan Ideal Star Inc. 6-6-3 Minamiyoshinari Aobaku Sendai 989-3204 Japan

No abstract available

ISBN: (纸本)1424411343

No abstract available

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A Novel Rotary Drum Filtering Photoreactor for Wastewater Treatment Using Titanium Dioxide Nanoparticles

A Novel Rotary Drum Filtering Photoreactor for Wastewater Tr...

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IEEE International Conference on Nano/Micro Engineered and Molecular systems (NEMS)

作者： Wiwut Tanthapanichakoon Tawatchai Charinpanitkul Takuji Yamamoto Noriaki Sano Napawon Thongprachan National Nanotechnology Center National Science and Technology Development Agency Thailand Center of Excellence in Particle Technology Department of Chemical Engineering Faculty of Engineering Chulalongkom University Thailand Energy-Efficient Chemical System Group Research Institute for Innovation in Sustainable Chemistry National Institute for Advanced Industrial Science and Technology Japan Department of Mechanical System Engineering Himeji Institute of Technology University of Hyogo Japan

A rotary drum filtering photoreactor using titanium dioxide (TiO 2 ) as photocatalyst could eliminate the problem of catalyst loss by elutriation with the effluent stream. The effects of operating conditions, namely, rotating speed and filtration velocity on phenol removal were investigated. The experimental results revealed that the rates of phenol decomposition and total organic carbon (TOC) depletion decreased against the increased rotating speed. The suitable speed of the drum was 5 rpm. As for the filtration velocity, the phenol decomposition and TOC depletion rates achieved their maxima when the filtration velocity was 0.73 cm min -1 . To obtain the intrinsic capacity of TiO 2 cake in degrading phenol, the photolysis of phenol was also studied. The results indicated that the photolysis efficiency of phenol after 360 min was 4.96% while the decomposition efficiency of phenol was 21.47%. They indicated that the presence of TiO 2 cake was a key factor for degrading phenol. In addition, the dark adsorption of phenol on TiO 2 cake after 30 min was insignificant at about 0.95%.

关键词： Filtering Wastewater treatment Titanium Nanoparticles Chemical technology Inductors Filtration Chemical industry Thermal degradation Chemical engineering

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Functionalized organic semiconductor-based field-effect transistors for phosphonate vapor detection

Functionalized organic semiconductor-based field-effect tran...

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International Symposium Semiconductor Device research (ISDRS)

作者： Jia Huang Joseph Miragliotta Alan Becknell Howard E. Katz Department of Materials Science and Engineeringt Johns Hopkins University Baltimore MD USA Sensor system group Research and technology development center Applied Physics Laboratory Johns Hopkins University Laurel MD USA

In this talk, we report initial studies of p-type oligomer OFETs, with hydroxyl and phenol functionalized semiconductor blends serving as receptor layers, responding to the weakly basic analyte dimethyl methylphosphonate (DMMP) that simulates phosphonate nerve agents. The hydroxyl group is the simplest receptor that could be utilized for enhancing this interaction. At least one blend appears to be single-phase based on x-ray diffraction and electron microscopy.

关键词： FETs Chemical sensors OFETs Sensor arrays Gas detectors Educational institutions Materials science and technology Physics Chemical transducers Chemical elements

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Integration Friendly Dual Metal Gate technology Using Dual Thickness Metal Inserted Poly-Si Stacks (DT-MIPS)

Integration Friendly Dual Metal Gate Technology Using Dual T...

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Symposium on VLSI technology

作者： Hyung-Suk Jung Sung Kee Han Hajin Lim Yun Ki Choi Cheol-kyu Lee Mong sub Lee Young-sub You Youngsu Chung Jong-bong Park Eun Ha Lee Hion Suck Baik Jong-Ho Lee Nae-In Lee Ho-Kyu Kang Advanced Process Development Team System LSI Division Samsung Electronics Company Limited Yongin si Gyeonggi South Korea Semiconductor Research and Development Center Memory Division Samsung Electronics Company Limited South Korea AE Center Samsung Advanced Institute of Technology Gyeonggi South Korea

ISBN: (纸本)9784900784031;4900784036

We have successfully developed integration friendly dual metal gate process utilizing a dual thickness metal inserted poly-Si stacks (DT-MIPS) structure; poly-Si/TaN/HfON stacks for nMOS and poly-Si/capping metal layer(c-ML)/AlO x /TaN/HfON stacks for pMOS. First, in spite of different metal thickness on n/pMOS, a high-selectivity gate etch process can completely remove metal and HfON layers from the S/D active regions with negligible Si recess in both n/pMOS. Consequently, in both short and long channel devices, n/pMOS V th values of ~plusmn0.35 V are obtained without counter channel doping. Moreover, excellent drive currents (620/250 muA/um for n/pMOS at I off =20 pA/um and V dd =1.2 V) are obtained without using any mobility enhancement technique. Finally, we confirm that the estimated operation voltages for 10 years lifetime for both nMOS PBTI and pMOS NBTI are well beyond the 1.2 V.

关键词： MOS devices Etching Fabrication CMOS process Large scale integration research and development Counting circuits Doping Life estimation Lifetime estimation

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Long duration real-time observation of Irrawaddy dolphins in Chilika lagoon

Long duration real-time observation of Irrawaddy dolphins in...

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2007 OCEANS, vol.3

作者： T. Inoue T. Ura H. Sugimatsu T. Sakamaki J. Kojima R. Bahl S. Panda M. Khan B. K. Behera S. K. Behera H. Takahashi S. Kar C. Kar Ura Laboratory Underwater Technology Research Center Institute of Industrial Science University of Tokyo Japan KDD Research and Development Laboratories Inc. Japan IIT Delhi India Chilika Development Authority India WWF-India India System Giken corporation Japan PCCF Wildlife Orissa India

ISBN: (纸本)9780933957374

The authors have developed a passive acoustic observation system to monitor Irrawaddy dolphins (Orcaella brevirostris) in Chilika lagoon. The system is designed to monitor the detailed underwater behavior of dolphins using a Short Base Line (SBL) system all through the day and night. The underwater sounds are recorded at a sampling frequency of 500 kHz with 16 bits resolution. This system was deployed in Chilika lagoon from 29th January to 3rd February and on 18th February in 2007. Experiments were carried out all through the night. By replacing the batteries and hard disks, the observation system was made to keep running all the time. Consequently, the authors succeeded in obtaining click data from Irrawaddy dolphins for a continuous duration of about 21-hour consecutively for each trial and about 1 TB of acoustic data was obtained in total. The data contained many high frequency signals, which are considered to be the snapping noise made by shrimp, which are typically found in warm shallow water areas such as Chilika lagoon. A de-noise calculation is developed and applied to the obtained data. A clear picture of trajectories of dolphins in the turbid environment of the Chilika lagoon can be observed that has never before been seen. In this paper, detailed ideas and descriptions of the set up and deployment of the system are presented. Furthermore, the de-noise calculation and the observed dolphin trajectories will be discussed.

关键词： Dolphins Underwater acoustics Monitoring Frequency Underwater technology Sampling methods Batteries Hard disks Acoustic noise Working environment noise

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