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2014 IEEE 40th Photovoltaic Specialist Conference (PVSC)

作者： Sabina Abdul Hadi Evelina Polyzoeva Tim Milakovich Mayank Bulsara Judy L. Hoyt Eugene A. Fitzgerald Ammar Nayfeh Department of Electrical Engineering and Computer Science (EECS) Masdar Institute of Science and Technology Abu Dhabi UAE MIT Microsystems Technology Laboratories Cambridge MA USA

ISBN: (纸本)9781479943975

A novel GaAs 0.71 P 0.29 /Si tandem cell is proposed and simulated. In order to grow GaAs 0.71 P 0.29 layers on Si, Si 1-y Ge y (SiGe) buffer layers can be used but optical losses are expected. To reduce large optical losses a wafer bonded/layer transferred structure can be used that eliminates the SiGe buffer layer. In this work we propose a novel tandem step-cell design that partially exposes the underlying Si cell for both wafer bonded and SiGe based cells. We demonstrate by experiment and simulation mitigation of the optical losses associated with SiGe buffer layers. For an optimized GaAs 0.71 P 0.29 /Si tandem cell without the step cell design, simulations estimate ~20% efficiency for the bonded structure and ~3% for the as grown structure with a SiGe buffer. With the proposed novel step-cell design, optimum efficiency of bonded structure increases to ~32% while for structures with SiGe the simulated efficiency reaches ~23%. Optimum exposure of bottom cell area increases with increasing thickness and lifetime of layers above the bottom Si cell.

关键词： Silicon Silicon germanium Optical buffering Buffer layers Photovoltaic cells Optical losses Gallium arsenide

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Exascale Storage Systems the SIRIUS Way

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Journal of Physics: Conference Series 2016年第1期759卷

作者： S A Klasky H Abbasi M Ainsworth J Choi M Curry T Kurc Q Liu J Lofstead C Maltzahn M Parashar N Podhorszki E Suchyta F Wang M Wolf C S Chang M Churchill S Ethier Oak Ridge National Laboratory Oak Ridge TN 37831 USA Department of Electrical Engineering & Computer Science The University of Tennessee Knoxville Knoxville Tennessee 37996 USA School of Computer Science Georgia Institute of Technology Atlanta GA 30332 USA Division of Applied Mathematics Brown University Providence RI 02912 USA Sandia National Laboratories Albuquerque NM 87185 USA Department of Biomedical Informatics Stony Brook University Stony Brook NY 11794 USA Computer Science Department University of California at Santa Cruz Santa Cruz CA 95064 USA Rutgers Discovery Informatics Institute Rutgers University Piscataway NJ 08854 USA Princeton Plasma Physics Laboratory Princeton NJ 08543 USA

As the exascale computing age emerges, data related issues are becoming critical factors that determine how and where we do computing. Popular approaches used by traditional I/O solution and storage libraries become increasingly bottlenecked due to their assumptions about data movement, re-organization, and storage. While, new technologies, such as 'burst buffers', can help address some of the short-term performance issues, it is essential that we reexamine the underlying storage and I/O infrastructure to effectively support requirements and challenges at exascale and beyond. In this paper we present a new approach to the exascale Storage System and I/O (SSIO), which is based on allowing users to inject application knowledge into the system and leverage this knowledge to better manage, store, and access large data volumes so as to minimize the time to scientific insights. Central to our approach is the distinction between the data, metadata, and the knowledge contained therein, transferred from the user to the system by describing 'utility' of data as it ages.

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Pitch scaling of ultrafast, optically-triggered silicon field emitter arrays

Pitch scaling of ultrafast, optically-triggered silicon fiel...

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International Conference on Vacuum Nanoelectronics (IVNC)

作者： Michael E. Swanwick Chen D. Dong Philip D. Keathley Arya Fallahi Franz X. Kärtner Luis Fernando Velasquez-García Microsystems Technology Laboratories Massachusetts Institute of Technology Cambridge MA USA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA DESY University of Hamburg Hamburg Germany

Ultrafast, optically-triggered field emitter arrays are an exciting new area of research with potential application in ultrafast imaging and in coherent x-ray sources based on inverse Compton scattering. The fabrication and preliminary experimental results of pitch scaling on emitter arrays using n-type silicon wafers and scalable CMOS processing is studied to better understand the effect of tip to tip field interaction, space charge and fabrication limitations.

关键词： Silicon Cathodes Space charge Stimulated emission Optical device fabrication Optical imaging Optical scattering

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Photonic network vision 2020 - Toward smart photonic cloud

Photonic network vision 2020 - Toward smart photonic cloud

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作者： Kitayama, Ken-Ichi Hiramatsu, Atsushi Fukui, Masaki Tsuritani, Takehiro Yamanaka, Naoaki Okamoto, Satoru Jinno, Masahiko Koga, Masafumi Department of Electrical Electronic and Information Engineering Osaka University Suita 565-0871 Japan NTT Photonics Laboratories Yokosuka Japan NTT Advanced Technology Corporation United States Department of Optical Transport Network Laboratory KDDI Research and Development Laboratories Inc. Saitama 356-8502 Japan Department of Computer Science Keio University Yokohama 223-8522 Japan Department of Electrical Engineering Kagawa University Takamatsu 239-0847 Japan Department of Electrical and Electronic Engineering Oita University Oita 870-1124 Japan

A vision of the photonic network in 2020 is presented, which envisages a 'smart photonic cloud.' A smart photonic cloud is defined as a universal network platform without any physical or logical constraint that provides flexible connectivity for machine-to-machine communication such as networked high-performance computing or intra- and inter-data center networks. The key requirements for the network in the Big Data era include an ultralarge capacity with low power consumption, low latency, as well as flexibility on demand to the changes in the configuration and bandwidth of the optical path. To cope with the growing demand for network virtualization, novel photonic layer virtualization will be proposed, which differs from the conventional approach in terms of the number of slices and the dynamic range of the bandwidth of each slice. First, the objectives and the guiding principle of the vision will be addressed. Next, three 'Ss' will be presented that represent the key enabling technologies, namely scale-free photonics, smart photonic networking, and a synthetic transport platform. A key engine with which to realize the above three enabling technologies is the photonic network processor (P-NP), which can define versatile functionality of switches and transmission systems by software. The P-NP takes advantage of the rapid progress made on digital signal processing for coherent optical transmission systems, and it consists of pools of optical frontends, digital signal processors, L1/L2 switches, which are either electrically or optically interconnected based on silicon photonic technology. Finally, a multifunctional optical cross-connect and a bit-rate-flexible optical transponder are presented as examples of P-NP applications. © 1983-2012 IEEE.

关键词： Optical fiber communication

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Modeling and measured verification of stored energy and loss in MEMS toroidal inductors

Modeling and measured verification of stored energy and loss...

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作者： Araghchini, Mohammad Yu, Xuehong Kim, Min Soo Qiu, Jizheng Herrault, Florian Sullivan, Charles R. Allen, Mark G. Lang, Jeffrey H. Department of Electrical Engineering and Computer Science School of Engineering Massachusetts Institute of Technology Cambridge MA 02139 United States MicroSensors and MicroActuators Laboratory College of Engineering School of Electrical and Computer Engineering Atlanta GA 30332 United States School of Electrical and Computer Engineering College of Engineering Georgia Institute of Technology Atlanta GA 30332-0250 United States Thayer School of Engineering Dartmouth College Hanover NH 03755 United States Maxim Integrated Products Inc. Chelmsford MA 01863 United States HRL Laboratories LLC Malibu CA 90265-4797 United States

This paper presents the derivation and verification of a sinusoidal steady-state equivalent-circuit model for microfabricated inductors developed for use in integrated power electronics. These inductors have a low profile, a toroidal air core, and a single-layer winding fabricated via high-aspect-ratio molding and electroplating. Such inductors inevitably have a significant gap between winding turns. This makes the equivalent resistance more difficult to model. The low profile increases the significance of the energy that is stored in the winding, which together with the winding gap makes the equivalent inductance more difficult to model. The models presented here account for these effects. Finally, the models are verified against results from 2-D and 3-D finite-element analysis (2-D FEA and 3-D FEA) direct measurement, and from in-circuit experimentation. In all cases, the equivalent-circuit model is observed to be accurate to within several percentage. © 1972-2012 IEEE.

关键词： Finite element method

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Editorial: Special Issue on Secure Physical Layer Communications

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IET Communications 2014年第8期8卷 1181-1183页

作者： Trung Q. Duong Daniel Benevides da Costa Kyeong J. Kim Kuang-Hao (Stanley) Liu Vo Nguyen Quoc Bao School of Electronics Electrical Engineering and Computer Science Queen's University Belfast UK Department of Computer Engineering Federal University of Ceaŕa Brazil Mitsubishi Electric Research Laboratories (MERL) USA Department of Electrical Engineering National Cheng Kung University Taiwan Department of Electrical Engineering Posts and Telecommunications Institute of Technology (PTIT) Vietnam

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~23% Increase in Efficiency of 100 nm Thin Film a-Si Solar Cells Using Combination of Si/InN and Au Nanoparticles

~23% Increase in Efficiency of 100 nm Thin Film a-Si Solar C...

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IEEE Photovoltaic Specialist Conference

作者： Farsad Imtiaz Chowdhury Aaesha Alnuaimi Sabri Alkis Ali K. Okyay Munir Nayfeh Ammar Nayfeh Institute Center for Microsystems (iMicro) Department of Electrical Engineering and Computer Science (EECS) Masdar Institute of Science and Technology P.O. Box 54224 Abu Dhabi UAE UNAM - National Nanotechnology Research Center and Institute of Materials Science and Nanotechnology Bilkent University 06800 Ankara Turkey Department of Physics University of Illinois at Urbana-Champaign 1110 W. Green Street Urbana Illinois 61801

ISBN: (纸本)9781479979455

In this work we report 23% increase in efficiency of n-i-p a-Si:H cells using Si, InN and Au nanoparticles. These cells shows an average improvement of 24.54% in short circuit current. The coated cells also reduce the reflection by 2.7% compared to reference cell between 300-800 nm, which indicates light is getting scattered by these nanoparticles. EQE and IQE analysis show that the overall enhancement can be attributed to photon energy downshifting with a reduction in reflectivity.

关键词： nanoparticles solar cells spin coating scattering downshifting

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Correction to “Feedback Analysis and Design of RF Power Links for Low-Power Bionic Systems” [Mar 07 28-38]

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IEEE Transactions on Biomedical Circuits and Systems 2014年第1期8卷 148-149页

作者： Manel Gasulla Joan Albesa Michael W. Baker Rahul Sarpeshkar Electronic Engineering Department Universitat Politènica de Catalunya Barcelona Spain Department of Microsystems Engineering University of Freiburg Freiburg Germany Maxim Integrated North Chelmsford MA USA Electrical Engineering and Computer Science Department Massachusetts Institute of Technology Cambridge MA USA

We report on corrections to two equations in a paper authored by two of us (M.W. Baker and R. Sarpeshkar, see ibid., vol. 1, no. 1, pp. 28-38, Mar. 2007). These corrections were discovered and graciously pointed out by two authors of this manuscript (M. Gasulla and J. Albesa). These corrections generate a more accurate set of equations that do not make approximations made in the original paper. The approximations to the equations do not impact fits to experimental data presented in the original paper, which continue to remain excellent: The experimental data in the original paper were obtained for typical near-field RF power links used in bionic implants where the accurate and approximate equations yield nearly identical results. However, in other experimental systems, the more accurate expressions derived by M. Gasulla and J. Albesa should be used.

关键词： Coils Feedback Power amplifiers Implantable biomedical devices Low-power electronics

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A Robust Vision System for a UAV Transporting Cargoes between Moving Platforms

A Robust Vision System for a UAV Transporting Cargoes betwee...

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第三十三届中国控制会议

作者： Shiyu Zhao Zhangyuan Hu Mingfeng Yin Kevin Z.Y.Ang Peidong Liu Fei Wang Xiangxu Dong Feng Lin Ben M.Chen Tong H.Lee Department of Electrical & Computer Engineering National University of Singapore Department of Information Engineering The Chinese University of Hong Kong School of Automation Nanjing University of Science and Technology Temasek Laboratories National University of Singapore

Motivated by the 2013 International UAV Innovation Grand Prix(UAVGP),we design and implement a real-time vision system for an unmanned helicopter to transfer cargoes between two moving platforms fully *** key algorithms in the vision system include ellipse detection,ellipse tracking and single-circle-based pose *** experiments have verified the efficiency,accuracy and robustness of the *** developed vision system has helped us achieving a great success in *** team was ranked first in the final round *** a UAV Transporting Moving Platforms feng Yin3,Kevin ***1,Peidong Liu1,Feieng Lin4,Ben ***1,Tong ***1omputer engineering,National University of ***,elelp@***,bmchen@***,eleleengineering,The Chinese University of Hong Kong ail:mua08p@*** Nanjing University of science and technology yinmingfengnjust@*** atories,National University of Singapore ***,tsldngx@***,linfeng@*** V Innovation Grand Prix(UAVGP),we design and ier cargoes between two moving platforms fully auton,ellipse tracking and single-circle-based pose estimd robustness of the *** developed visionanked first in the final round *** vehicle,Ellipse detection,Circle-based pose esti

关键词： Vision-based navigation,Unmanned aerial vehicle,Ellipse detection,Circle-based pose estimation,OpenCV.

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Experimental Evaluation of Wireless Communication Channels under Radiation Environment

Experimental Evaluation of Wireless Communication Channels u...

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International Symposium on Future I&C for Nuclear Power Plants（ISOFIC2014）

作者： Quan WANG Liquan LI Jin JIANG Ataul BARI Changjian DENG Bhaskar SUR Dongyi CHEN Department of Electrical and Computer Engineering University of Western Ontario Applied Physics Branch Atomic Energy of Canada LimitedChalk River Laboratories The University of Electronic Science and Technology Nuclear Science Division Atomic Energy of Canada LimitedChalk River Laboratories

Deployment of wireless systems in nuclear power plants has attracted a lot of attention ***,before wireless systems can be installed in a nuclear power plant,it is necessary to evaluate the effect of radiation environment on electromagnetic wave which is the communication media for all radio wave based wireless *** is particular important if the wireless systems are expected to work in a harsh and radioactive environment following a severe *** paper presents some results of an experiment for evaluating the effect of radiation on electromagnetic *** experiments involve placing transmitter antenna and receiver antenna in a hot cell with variable strength of radiation to study the attenuation effects of the radioactive *** results indicate that radiation does not effect on the electromagnetic wave *** fact should be considered during the design and deployment wireless systems in a potentially radioactive environment.

关键词： Radiation Environment Wireless Communication Electromagnetic Wave Gamma ray

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