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检索条件"任意字段=Conference on Advances in Optical Data Storage Technology"

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Tracking deflection in the field using optical system: A case study 27th

Tracking deflection in the field using optical system: A cas...

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27th European Safety and Reliability conference, ESREL 2017

作者： Xu, Y. Huseynov, F. Brownjohn, J.M.W. O’Brien, E.J. Hester, D. College of Engineering Mathematics and Physical Sciences University of Exeter Exeter United Kingdom Full Scale Dynamics Ltd. Sheffield United Kingdom School of Civil and Structural Engineering University College Dublin Dublin Ireland School of Planning Architecture and Civil Engineering Queen’s University Belfast Belfast United Kingdom

ISBN: (纸本)9781138629370

Monitoring displacement of in operation bridges is practically challenging but potentially very useful for condition assessment and decision support. The primary difficulties are in finding fixed physical reference points and, for the majority short span bridges under normal operation, the mm-level magnitudes of displacement under normal operating conditions (e.g. standard truck loading). With rare possibility for physical connection between a reference and a bridge, non-contacting technologies such as GPS need to be used. Other options include total station and more exotic technologies of laser interferometer and radar have also been tried. There are drawbacks for each technology related to limited sample rate (for total station) and signal to noise ratio (for GPS) while radar and laser are expensive and require specialist users. With advances in computing power, optics-based systems are becoming popular, relying on a standard lens but with capability to track multiple positions with potential to recover deformation with high spatial resolution. This paper reports the experiences of the authors exploring the suitability of a commercially available optics-based system in terms of spatial and temporal resolution and sampling and in challenging field conditions required for long term monitoring. For example issues such as stability of camera mounting (e.g. in wind) and varying lighting conditions while not problematic in a laboratory govern performance in the field. The paper tracks a sequence of experiments moving from lab to field, ultimately moving up to a field test on a road bridge in Devon. In each case the capabilities and limitations of the system have been critically examined. The study has defined both limitations and capabilities, while defining best approaches for use and at the same time providing some useful performance data on the subject bridges. © 2017 Taylor & Francis Group, London.

关键词： Life cycle

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Synthesis, Kinetics and Electrochemical Properties of a New Photochromic Diarylethene

Synthesis, Kinetics and Electrochemical Properties of a New ...

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2011 International conference on Advanced Materials and Computer Science(ICAMCS 2011)

作者： Shouzhi Pu Renjie Wang Hongying Xia Gang Liu Jiangxi Key Laboratory of Organic Chemistry Jiangxi Science and Technology Normal University

A new unsymmetrical photochromic diarylethene [1-(2-methyl-5-(3-methoxyphenyl)-3-thienyl), 2-(2-methyl-3-benzothienyl)] perfluorocyclopentene(1a), was synthesized, and its photochromic properties such as photochromism, kinetics and electrochemical properties were investigated in detail. The results showed that the compound exhibited excellent photochromism both in solution and in PMMA film with alternating irradiation by UV/Vis light. The kinetic and electrochemical experiments indicated that the cyclization/cycloreversion process of the compound was determined to be the zeroth/first order reaction, and the electrochemcial switching property can be potential use for electrochemistry data storage. At last, using this dithienylethene as recording medium was performed successfully.

关键词： Diarylethene Photochromism Electrochemical optical storage

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NanoFlowNet: Real-time Dense optical Flow on a Nano Quadcopter

NanoFlowNet: Real-time Dense Optical Flow on a Nano Quadcopt...

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IEEE International conference on Robotics and Automation (ICRA)

作者： Rik J. Bouwmeester Federico Paredes-Vallés Guido C. H. E. de Croon Micro Air Vehicle Laboratory Faculty of Aerospace Engineering Delft University of Technology Delft The Netherlands

Nano quadcopters are small, agile, and cheap platforms that are well suited for deployment in narrow, cluttered environments. Due to their limited payload, these vehicles are highly constrained in processing power, rendering conventional vision-based methods for safe and autonomous navigation incompatible. Recent machine learning developments promise high-performance perception at low latency, while dedicated edge computing hardware has the potential to augment the processing capabilities of these limited devices. In this work, we present NanoFlowNet, a lightweight convolutional neural network for real-time dense optical flow estimation on edge computing hardware. We draw inspiration from recent advances in semantic segmentation for the design of this network. Additionally, we guide the learning of optical flow using motion boundary ground truth data, which improves performance with no impact on latency. Validation results on the MPI-Sintel dataset show the high performance of the proposed network given its constrained architecture. Additionally, we successfully demonstrate the capabilities of NanoFlowNet by deploying it on the ultra-low power GAP8 microprocessor and by applying it to vision-based obstacle avoidance on board a Bitcraze Crazyflie, a 34 g nano quadcopter.

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Nanofabrication of sub-wavelength size aperture array for near field optical probe array

Nanofabrication of sub-wavelength size aperture array for ne...

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IEEE conference on Nanotechnology

作者： J.T. Ok S.S. Choi D.W. Kim C.K. Chun J.W. Kim J.H. Boo Department of Physics Research Center for Nanoscience and Technology Sunmoon University Ansan Chungcheongnam South Korea Department of Mechanical Engineering Sunmoon University Ansan Chungcheongnam South Korea Department of nanoscience & Technology Sungkyunkwan University Suwon Gyeonggi South Korea

Recently there have been tremendous interests about near field optical lithographic techniques for the next generation gigabyte information storage devices. The near field optical lithographic technique will circumvent the classical diffraction limit and can provide the sub-wavelength size patterns less than 100 nm and the parallel data processing has been examined. Therefore, several parallel processing techniques such as multi-cantilever array and the nano-size aperture array have been previously reported. In this work, the nano-fabrication technique for the sub-wavelength size aperture array is presented. Initially, the (50/spl times/50) dot array was patterned on the SiO/sub 2/ thermally grown on Si (100) substrate. Each dot has (5/spl times/5) /spl mu/m/sup 2/ pattern size. The anisotropic TMAH etching of the Si substrate was performed and followed by anisotropic stress-dependent thermal oxidation at 1000/spl deg/C and backside Si etching using TMAH solution. The opening of the nano-size aperture on the oxide pyramid array was carried out using water-diluted (50:1) HF solution. The uniformity of the (50/spl times/50) nano-size aperture array was examined carefully on the four corners of the array patterns. The average diameter of the aperture was -260 nm and its deviation was found to be /spl sim/10%. The optical characterization for the oxide pyramidal array was performed and its diffraction pattern was revealed. In addition, the 50 nm thick Al thin film for the near field probe was deposited and the result of its characterization is reported.

关键词： optical arrays Nanofabrication Apertures Probes optical films optical diffraction Substrates Anisotropic magnetoresistance Etching optical devices

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The characteristics of sum-frequency- mixing by biaxial crystal LiB3O5 and KTiOPO4

The characteristics of sum-frequency- mixing by biaxial crys...

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Pacific Rim conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： J.Q. Yao Y. Zheng Y. Tang M.H. Dunn W. Sibbett Jian-quan Yao Institute of Laser and Opto-electronics Tianjin China J.F.Aallen Physics Research Lab Department of Physics and Astronomy Saint Andrews Fife UK

In recent years short wavelength coherent radiation lying in the blue and UV range has attracted wide attention for a variety of applications, including laser printing, optical data storage, display technology and undersea communication et al. Some relative new type nonlinear optical crystals such as KTiOPO4 (KTP), KTiOAsO4 (KTA), LiB3O5 (LBO), β-BaB2O4 (BBO), KNbO3 et al. have been widely used to main solid state laser (Nd: YAG, Nd:YLF, Ti:Al2O3 et al.), dye laser, excimer laser and diode laser et al. By frequency up conversion (sum frequency mixing) more short wavelength coherent radiation (even short to 190 nm) could be obtained. Using different nonlinear crystals and different technology a wide wavelength range (188 nm–459 nm) can be generated by sum frequency mixing. SFM with different crystals was summary in this paper.

关键词： Free electron lasers Frequency conversion optical frequency conversion Tellurium optical harmonic generation Solid lasers Nonlinear optics optical mixing Crystals optical pulses

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HRDFS Design of High-resolution Red-ray optical Disk Authoring System

HRDFS Design of High-resolution Red-ray Optical Disk Authori...

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2010 International conference on Semiconductor Laser and Photonics (ICSLP 2010)

作者： Linyi Li, Chenxi H., Jianpin Xiong, and Cheng Ma Dep. of Precision Instrument and Mechanology Tsinghua University Haidian Distric,t Beijing, 100084, P.R.China

One effective implementation of the High- resolution Red-ray optical Disk File System (HRDFS), which is used for next generation optical storage system’s authoring software, is presented in this paper. Logic Format of HRDFS will be introduced firstly. And the algorithms of constructing HRD directory structure, writing directory structure and file data will be focused on. Moreover, the experimental results of testing this implementation will be shown to prove the correctness and effectiveness of the algorithms. Overall, the HRDFS module, which is employed for translating common media streams into those of HRD format, is the essential part of HRD Authoring System. As the design is based on the view of HRD authoring system, it partly provides an efficient implementation way for HRD authoring system.

关键词： HRD, file system, authoring system.

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Characterization of waveguide and grating formation in As/sub 2/S/sub 3/

Characterization of waveguide and grating formation in As/su...

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IEEE Photonics conference (IPC)

作者： J.P. Guo S. Ramachandran S.G. Bishop D.J. Brady Center fir Optoelectronic Science and Technology Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign Urbana IL USA

Photodarkening in the chalcogenide glass As/sub 2/S/sub 3/ makes it attractive for applications in integrated optics and data storage. Various optical devices can be fabricated using the laser-induced change of refractive index in this material. Waveguides, directional couplers, and holographic gratings have been fabricated on thin films and bulk samples of As/sub 2/S/sub 3/. This paper reports studies of the dynamics of waveguide and grating formation on the surface of bulk As/sub 2/S/sub 3/. Spatial and temporal characteristics of laser-induced refractive index changes are described. Several different materials effects are shown to contribute to the index modulation.

关键词： Gratings optical waveguides Laser transitions Waveguide lasers Refractive index optical materials Photochromism Glass Integrated optics Memory

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An exploratory survey on the use of computation in undergraduate engineering education

An exploratory survey on the use of computation in undergrad...

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Frontiers in Education (FIE) conference

作者： Alejandra J. Magana Camilo Vieira Francesca G. Polo Junchao Yan Xin Sun Purdue University: Computer and Information Technology West Lafayette IN U.S.A. Engineering Education West Lafayette IN U.S.A. Statistics West Lafayette IN U.S.A.

advances in computing contribute to science and engineering discovery, innovation, and education by facilitating representations, processing, storage, analysis, simulation, and visualization of unprecedented amounts of experimental and observational data to address problems that affect health, energy, environment, security, and quality of life. In spite of the emerging importance of the role of computing in engineering, a well-recognized shortage of scientists and engineers who are adequately prepared to take advantage of, or contribute to, such highly interdisciplinary, highly computational scientific challenges is evident. This exploratory study identifies how computation is integrated in the engineering disciplines at the undergraduate level. The research question is: How engineering professors integrate computation as part of their disciplinary undergraduate courses? This study reports anonymous survey responses of thirty-nine engineering and engineering technology faculty members who identified themselves as integrating computation as part of their undergraduate courses. Results indicate that most of the faculty members used computation for the solution of complex calculations, for conducting simulations, and for design purposes. Further research is required in order to identify and validate appropriated pedagogical practices to integrate computation as part of disciplinary courses.

关键词： Computational modeling Education Mathematical model data models Predictive models Context MATLAB

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Tight focusing of amplitude modulated HyGG type — II beam using high NA lens axicon

Tight focusing of amplitude modulated HyGG type — II beam u...

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International conference on Fiber Optics and Photonics (PHOTONICS)

作者： P. Suresh K.B. Rajesh T.V.S. Pillai Department of ECE National college of Engineering Maruthakulam Tirunelveli Tamilnadu - 627151. India Department of Physics Chikkanna Government Arts College Tirupur Tamil Nadu India University departments Anna University of Technology Tirunelveli Tamil Nadu India

The focal field of high NA lens axicon with an amplitude modulated optical component is calculated by using vector diffraction theory. Numerical results show that for a radially polarized Hypergeometric-Gaussian type-II input field, the proposed system generates subwavelength focal spot size (0.386 λ) with a uniform depth of Focus (14.38 λ). We expect such a beam with small spot size and long depth of focus can be widely used in application such as data storage, biomedical imaging, laser drilling, and machining.

关键词： Diffraction theory Electric fields Gaussian beams Laser drilling Medical imaging Near field scanning optical microscopy Apodization (220.1230) Polarization (260.5430)

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High-speed magnetic imaging

High-speed magnetic imaging

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International conference on Quantum Electronics (IQEC)

作者： M.R. Freeman G.E. Ballentine W.K. Hiebert A. Stankiewicz University of Alberta Edmonton AB CA

Summary form only given. The dynamics of the magnetization in small ferromagnetic structures is a topic of considerable current interest. The timing of this interest is largely attributable to rapid advances in magnetic recording technology, for which such dynamics will dictate the ultimate limits in speed and storage density. High-speed magneto-optic imaging is now being used in an effort to gain new insight into micromagnetic dynamics. The technique is directly analogous to electro-optic sampling of electronic systems. In magneto-optic sampling, magnetic transients are measured via small changes in the plane of polarization of linearly polarized light upon reflection from, or transmission through a sample, the Kerr and Faraday effects, respectively.) Ultrafast measurements with good signal-to-noise are obtained in pump-probe experiments in which the magnetic dynamics are driven using photoconductively switched electromagnetic circuits.

关键词： Magnetooptic effects Magnetooptic recording Sampling methods Electromagnetic measurements optical polarization Electromagnetic wave polarization Magnetization Timing Magnetic recording Micromagnetics

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