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Perfect valley filter in strained graphene with single barrier region

AIP advances 2016年第5期6卷 056303-056303页

作者： Yesilyurt, Can Tan, Seng Ghee Liang, Gengchiau Jalil, Mansoor B. A. Natl Univ Singapore Elect & Comp Engn Singapore 117576 Singapore ASTAR Data Storage Inst Singapore 138634 Singapore

We present a single barrier system to generate pure valley-polarized current in monolayer graphene. A uniaxial strain is applied within the barrier region, which is delineated by localized magnetic field created by ferromagnetic stripes at the region's boundaries. We show that under the condition of matching magnetic field strength, strain potential, and Fermi energy, the transmitted current is composed of only one valley contribution. The desired valley current can transmit with zero reflection while the electrons from the other valley are totally reflected. Thus, the system generates pure valley-polarized current with maximum conductance. The chosen parameters of uniaxial strain and magnetic field are in the range of experimental feasibility, which suggests that the proposed scheme can be realized with current technology. (C) 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

关键词： Magnetic fields Polarization Graphene Ferromagnetism Interface structure

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Bunch Tracing by Bunch by Bunch Measurement System in HLS

Bunch Tracing by Bunch by Bunch Measurement System in HLS

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IEEE conference on Particle Accelerator

作者： Kai Zheng J.H. Wang J.H. Liu Z.P. Liu W.M. Li B.G. Sun Y.L. Yang NSRL University of Science and Technology Hefei Anhui China

In this paper, we introduce a bunch tracing system which is based on a bunch-by-bunch (BxB) measurement system in Hefei Light Source (HLS), and present the analysis of the experiment results. Using an in-phase gate signal and a double balance mixer to control an external trigger of ADC, we test the reliability of the BxB system. By this system, we can trace all marked bunches in a set time slot or in manual burst mode. We can record all bunches’ data during the injection, ramping, wiggler excitation and normal operation, and provide a powerful facility for machine study.

关键词： High level synthesis Pulse modulation System testing Undulators optical modulation storage rings Feedback Amplitude modulation Radio frequency Linear particle accelerator

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FDTD simulation of semiconductor plasmonic nano-ring laser at 1550nm based on realistic semiconductor gain model

FDTD simulation of semiconductor plasmonic nano-ring laser a...

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conference on Lasers and Electro-Optics (CLEO)

作者： Xi Chen Bipin Bhola Yingyan Huang Seng-Tiong Ho Department of Electrical and Computer Engineering Northwestern University Evanston IL USA Agency for Science Technology and Research Data Storage Institute Singapore

We discuss the regime where nano-ring laser is feasible in which the absorption loss in metal is compensated by semiconductor gain. A nanometre-scale electrically pumped ring laser design is simulated using multi-leve... 详细信息

ISBN: (纸本)9781557528896

关键词： Finite difference methods Time domain analysis Plasmons Laser modes Semiconductor lasers Pump lasers Ring lasers Absorption Laser excitation optical design

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Comparison between fresh and fixed human biopsies using spectral and lifetime measurements: Fluorescence analysis using one and two photon excitations

Comparison between fresh and fixed human biopsies using spec...

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International conference on advances in Biomedical Engineering (ICABME)

作者： F. Poulon M. Zanello A. Ibrahim A. J. Zaylaa P. Varlet B. Devaux D. Abi Haidar IMNC Laboratory Orsay France University of Paris 7-Paris Diderot Paris France Department of Electrical and Computer Engineering American University of Beirut Lebanon Department of Neuropathology Sainte Anne Hospital France Department of Neurosurgery Sainte Anne Hospital France

The purpose of this study is to make a comparison between the fluorescence emissions of fresh extracted human biopsies and fixed human biopsies, in order to evaluate the impact of fixation on autofluoresence signal. Our group is developing an endomicroscope to image brain tissues in-vivo, however to date, in order to validate our technology the easiest type of samples we can access are fixed samples. However, the fixation is still challenging. For that, we aim through this study to determine whether we should pursue to work on fixed samples or we should shift to work on fresh biopsies. data were collected on spectroscopic, lifetime measurement and fluorescence imaging set-ups with visible and two-photon excitations wavelengths. Five fresh and five fixed samples are involved in the experiment. Endogenous fluorescence of fixed biopsies were calculated. Experimental results reveal that at 405 nm and 810 nm, the fresh samples have an intensity of fluorescence two times higher than that of fixed samples. However, for each fluorophore and each excitation wavelength, the lifetime for fresh samples is shorter than that for fixed samples. Still, further studies and investigations involving the comparison between different samples are required to strengthen our findings.

关键词： Hospitals Photonics Biomedical measurement Lifetime estimation Fluorescence Biomedical optical imaging

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Relay Selection Strategy (RSS) Design for In-Vehicle storage (IVS) System

Relay Selection Strategy (RSS) Design for In-Vehicle Storage...

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IEEE Global Communications conference

作者： Binbin Hu Rongqing Zhang Luoyang Fang Xiang Cheng Liuqing Yang State Key Laboratory of Advanced Optical Communication Systems & Networks School of EECS Peking University Beijing China Key Laboratory of Wireless Sensor Network & Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai China School of Software Engineering Tongji University Shanghai China Department of Electrical and Computer Engineering Colorado State University Fort Collins CO USA

ISBN: (数字)9781728109626

ISBN: (纸本)9781728109633

In recent years, autonomous driving has attracted a vast amount of attention from both industry and academia, which has introduced large amounts of region-related data. In order to release the burden in core networks caused by the communication demands for such data, various in-vehicle storage (IVS) systems have been widely studied to bring contents closer to users. To cope with the mobility issue hindering the realization of IVS systems, in this paper, we propose a relay selection strategy (RSS) consisting of the relay map construction (RMC) algorithm and the relay pair matching (RPM) algorithm with the assistance of the vehicle route information. By considering both the potential transmission amount and the waiting time, the proposed RSS generates an overall optimal relay assignment for the IVS system. The performance gain of the proposed RSS compared with the baseline is evaluated by a realistic simulator in terms of the relay failure ratio, the retrieval throughput, and the RSU consumption ratio. Simulation results show that the proposed RSS achieves higher efficiency and robustness than the baseline.

关键词： Relays Roads Robustness Prediction algorithms Mathematical model Wireless sensor networks Micromechanical devices

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Near-field second harmonic imaging for lead zirconate titanate piezoceramic

Near-field second harmonic imaging for lead zirconate titana...

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Quantum Electronics and Laser Science conference (QELS)

作者： I.I. Smolynianov C.H. Lee C.C. Davis Laboratory for Atomic Molecular and Optical Science and Engineering Electrical Engineering Department University of Maryland College Park MD USA

Summary form only given. The ability of ferroelectric materials such as Pb(Zr/sub x/Ti/sub 1-x/)O/sub 3/ (PZT) piezoceramics to switch from one stable polarization state to another forms the basis of a new thin film technology for data storage. Thin PZT films are used in prototype nonvolatile ferroelectric random access memory (NVFRAM) and dynamic random-access memory (DRAM) devices. We report second harmonic imaging of the surface of a PZT ceramic obtained in a near-field microscopy setup using a Ti:sapphire laser system consisting of an oscillator and a regenerative amplifier operating at 810 nm.

关键词： Titanium compounds Ferroelectric materials Switches Random access memory Lead Piezoelectric materials Polarization Transistors Ferroelectric films Prototypes

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Enumeration algorithms for constructing (d/sub 1/, /spl infin/, d/sub 2/, /spl infin/) run length limited arrays: capacity estimates and coding schemes

Enumeration algorithms for constructing (d/sub 1/, /spl infi...

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IEEE (first ITW conference of the year) Information Theory Workshop (ITW)

作者： S.G. Srinivasa S.W. McLaughlin School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta USA

We present two enumeration algorithms for a class of (d/sub 1/, /spl infin/, d/sub 2/, /spl infin/) run-length limited (RLL) constrained arrays. Based on the structure of these algorithms, we derive bounds for the maximum information rate of the constraint. We also give encoders and decoders for coded 2D constrained arrays with rates close to the derived bounds.

关键词： Holographic optical components Information rates Decoding Holography data storage systems Two dimensional displays Random processes Entropy Merging Writing

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Near-field characterization of micro-aperture surface emitting laser for near field data storage

Near-field characterization of micro-aperture surface emitti...

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IEEE Photonics conference (IPC)

作者： S. Shinada F. Koyama N. Nishiyama M. Arai K. Iga P&I Microsystem Research Center Tokyo Institute of Technology Yokohama Japan

Summary form only given. We have fabricated a 400 nm square micro-aperture VCSEL with single transverse mode operation. We carried out the near field characterization using a sharpened fiber probe. The FWHM of intensity below threshold was 250 nm, and our metal micro-aperture VCSEL may have a potential for a high resolution optical head.

关键词： Surface emitting lasers Memory Probes

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Big data Quality: A Survey

Big Data Quality: A Survey

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IEEE International conference on Services Economics (SE)

作者： Ikbal Taleb Mohamed Adel Serhani Rachida Dssouli CIISE Concordia University Montreal QC Canada College of Information Technology UAE University Al Ain UAE

With the advances in communication technologies and the high amount of data generated, collected, and stored, it becomes crucial to manage the quality of this data deluge in an efficient and cost-effective way. The storage, processing, privacy and analytics are the main keys challenging aspects of Big data that require quality evaluation and monitoring. Quality has been recognized by the Big data community as an essential facet of its maturity. Yet, it is a crucial practice that should be implemented at the earlier stages of its lifecycle and progressively applied across the other key processes. The earlier we incorporate quality the full benefit we can get from insights. In this paper, we first identify the key challenges that necessitates quality evaluation. We then survey, classify and discuss the most recent work on Big data management. Consequently, we propose an across-the-board quality management framework describing the key quality evaluation practices to be conducted through the different Big data stages. The framework can be used to leverage the quality management and to provide a roadmap for data scientists to better understand quality practices and highlight the importance of managing the quality. We finally, conclude the paper and point to some future research directions on quality of Big data.

关键词： Big data data integrity Quality management data visualization databases Sensors Social network services

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光电子技术及其进展

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应用光学 2002年第1期23卷 1-4页

作者：田芊毛献辉孙利群清华大学精密仪器与机械学系北京100084

综述了光电子学的产生及其发展 ,提出了光电子技术的几个发展方向和研究热点。对各种新型激光器、硅基光电子技术、有机聚合物光电子材料、光互连、光计算技术、大容量光存储。

关键词：光电子技术激光器硅基光电子技术光电子材料光互连光计算光存储生物医学光电子学发展方向

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