检索结果-内蒙古大学图书馆

A Novel Dorsal Trimline Approach for Passive-Dynamic Ankle-Foot Orthoses

STROJNISKI VESTNIK-JOURNAL OF MECHANICAL engineering 2018年第3期64卷 185-194页

作者： Surmen, Hasan Kemal Akalan, Nazif Ekin Fetvaci, Mahmut Cuneyt Arslan, Yunus Ziya Istanbul Univ Vocat Sch Tech Sci Dept Automot Technol Istanbul Turkey Istanbul Kultur Univ Fac Hlth Sci Dept Physiotherapy & Rehabil Istanbul Turkey Istanbul Univ Fac Engn Dept Mech Engn TR-34320 Istanbul Turkey

An ankle-foot orthosis (AFO) is an externally applied assistive device that encompasses the lower leg, ankle, and foot of the human body. In the current one-piece passive-dynamic AFO design, the trimming process is performed from lateral and medial parts of the ankle to ensure desired rotational displacement (hereafter referred to as design I). In most cases, stress concentrations occurring over the trimmed regions during walking can cause permanent damage to the AFO. In this study, to reduce the stress concentration and ensure a homogeneous stress distribution, a new trimming approach is presented, in which the trim zones were transferred from lateral and medial to dorsal (hereafter referred to as design ii). Finite element analyses of the designs I and ii models were carried out. Displacement and von Mises stress values for both models under the same loading and boundary conditions were obtained. Maximum displacement values were 8.51 mm and 9.05 mm for design I and design ii, respectively. Maximum stress values were 15.19 MPa and 6.70 MPa for design I and design ii, respectively. For the similar range of motion of ankle joint, the novel design produced less stress and more homogeneous stress distribution than the currently used design, thus indicating that design ii would be more resistant to plastic deformation than design I.

关键词： dorsal trimline ankle-foot orthosis finite element analysis computer-aided design 3D optical scanning

来源：评论

学校读者我要写书评

暂无评论

optical modeling of bullet-shaped LED for use in self-luminous traffic signs 18

Optical modeling of bullet-shaped LED for use in self-lumino...

引用

Conference on current developments in Lens design and optical engineering XViiI

作者： Lee, Ted L. Chen, Yi-Chun Tsai, Ming-Siou Sun, Ching-Cherng Natl Cent Univ Dept Opt & Photon 300 Zhongda Rd Taoyuan 32001 Taiwan

ISBN: (纸本)9781510612082;9781510612075

Bullet-shaped LEDs are commonly used in self-luminous traffic signs as LED-dotted matrices due to their low cost, simplicity, robustness, and ease of installation. We proposed a simple low-cost method that creates a model suitable for the high manufacturing tolerance found in bullet-shaped LEDs. The method starts from measuring multiple one-dimensional angular intensity patterns at interested distances from multiple LEDs to form a database, including distances at 10, 15, 20, 25, 35, 50, and 100 mm. Their normalized cross-correlations are then calculated to find the batch that has the most similarity and base our model off that batch. Finally, we validate the model via Monte Carlo simulations in comparison to the original one-dimensional angular intensity patterns in the database. The platform demonstrated to obtain an average of 99% in normalized cross correlation between different batches of the same model LED, and a model of that LED is currently under development.

关键词： LED modeling midfield bullet packaging dome package traffic signs

来源：评论

学校读者我要写书评

暂无评论

design of light guide sleeve on hyperspectral imaging system for skin diagnosis 18

Design of light guide sleeve on hyperspectral imaging system...

引用

Conference on current developments in Lens design and optical engineering XViiI

作者： Yan, Yung-Jhe Chang, Chao-Hsin Huang, Ting-Wei Chiang, Hou-Chi Wu Jeng-Fu Mang Ou-Yang Natl Chiao Tung Univ Inst Elect Control Engn Hsinchu Taiwan Natl Chiao Tung Univ Inst Biomed Engn Hsinchu Taiwan Natl Chiao Tung Univ Dept Elect & Comp Engn Hsinchu Taiwan Natl Chung Shan Inst Sci & Technol Taoyuan Taiwan

ISBN: (纸本)9781510612082;9781510612075

A hyperspectral imaging system is proposed for early study of skin diagnosis. A stable and high hyperspectral image quality is important for analysis. Therefore, a light guide sleeve (LGS) was designed for the embedded on a hyperspectral imaging system. It provides a uniform light source on the object plane with the determined distance. Furthermore, it can shield the ambient light from entering the system and increasing noise. For the purpose of producing a uniform light source, the LGS device was designed in the symmetrical double-layered structure. It has light cut structures to adjust distribution of rays between two layers and has the Lambertian surface in the front-end to promote output uniformity. In the simulation of the design, the uniformity of illuminance was about 91.7%. In the measurement of the actual light guide sleeve, the uniformity of illuminance was about 92.5%.

关键词： Light guide Uniform illumination Hyperspectral Image

来源：评论

学校读者我要写书评

暂无评论

InP-Based Generic Foundry Platform for Photonic Integrated Circuits

引用

IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS 2018年第1期24卷

作者： Augustin, Luc M. Santos, Rui den Haan, Erik Kleijn, Steven Thijs, Peter J. A. Latkowski, Sylwester Zhao, Dan Yao, Weiming Bolk, Jeroen Ambrosius, Huub Mingaleev, Sergei Richter, Andre Bakker, Arjen Korthorst, Twan SMART Photon NL-5612 AX Eindhoven Netherlands Eindhoven Univ Technol Inst Photon Integrat NL-5612 AZ Eindhoven Netherlands VPI Photon D-10587 Berlin Germany PhoeniX Software NL-7521 PL Enschede Netherlands

The standardization of photonic integration processes for InP has led to versatile and easily accessible generic integration platforms. The generic integration platforms enable the realization of a broad range of applications and lead to a dramatic cost reduction in the development costs of photonic integrated circuits (PICs). This paper addresses the SMART Photonics generic integration platform developments. The integration technology based on butt joint active-passive epitaxy is shown to achieve a platform without compromising the performance of the different components. The individual components or building blocks are described. A process design kit is established with a comprehensive dataset of simulation and layout information for the building blocks. Latest results on process development and optimization are demonstrated. A big step forward is achieved by applying high-resolution ArF lithography, which leads to increased performance for AWGs and a large increase in reproducibility and yield. The generic nature of the platform is demonstrated by analyzing a number of commercial multiproject wafer runs. It is clear that a large variety of applications is addressed with more than 200 designs from industry as well as academia. A number of examples of PICs are displayed to support this. Finally, the design flow is explained, with focus on layout-aware schematic-driven design flow that is required for complex circuits. It can be concluded that generic integration on InP is maturing fast and with the current developments and infrastructure it is the technology of choice for low cost, densely integrated PICs, ready for high-volume manufacturing.

关键词： Photonic integrated circuits microwave photonics silicon photonics semiconductor optical amplifiers quantum well lasers photodiodes iiI-V semiconductor materials

来源：评论

学校读者我要写书评

暂无评论

Proceedings of SPIE - The International Society for optical engineering

Proceedings of SPIE - The International Society for Optical ...

引用

current developments in Lens design and optical engineering XViiI 2017

ISBN: (纸本)9781510612075

The proceedings contain 35 papers. The topics discussed include: wavefront analysis from its slope data;parametric diffraction efficiency of non-paraxial sinusoidal reflection gratings;camera system MTF: combining optic with detector;diffraction and geometrical optical transfer functions: calculation time comparison;linear decomposition of the optical transfer function for annular pupils;assembly of a micro-optical resonator based on silicon micro mirrors for use in gyroscopes;and fabrication of multi-focal microlens array on curved surface for wideangle camera module.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Contact lens design with slope-constrained Q-type aspheres for myopia correction 18

Contact lens design with slope-constrained Q-type aspheres f...

引用

Conference on current developments in Lens design and optical engineering XViiI

作者： Peng, Wei-Jei Cheng, Yuan-Chieh Hsu, Wei-Yao Yu, Zong-Ru Ho, Cheng-Fang Abou-El-Hossein, Khaled Natl Appl Res Labs Instrument Technol Res Ctr Taiwan 20R&D Rd 6Hsinchu Sci Pk Hsinchu 300 Taiwan Nelson Mandela Metropolitan Univ Precis Engn Lab ZA-6031 Port Elizabeth South Africa

ISBN: (纸本)9781510612082;9781510612075

The design of the rigid contact lens (CL) with slope-constrained Q-type aspheres for myopia correction is presented in this paper. The spherical CL is the most common type for myopia correction, however the spherical aberration (SA) caused from the pupil dilation in dark leads to the degradation of visual acuity which cannot be corrected by spherical surface. The spherical and aspheric CLs are designed respectively based on Liou's schematic eye model, and the criterion is the modulation transfer function (MTF) at the frequency of 100 line pair per mm, which corresponds to the normal vision of one arc-minute. After optimization, the MTF of the aspheric design is superior to that of the spherical design, because the aspheric surface corrects the SA for improving the visual acuity in dark. For avoiding the scratch caused from the contact profilometer, the aspheric surface is designed to match the measurability of the interferometer. The Q-type aspheric surface is employed to constrain the root-mean-square (rms) slope of the departure from a best-fit sphere directly, because the fringe density is limited by the interferometer. The maximum sag departure from a best-fit sphere is also controlled according to the measurability of the aspheric stitching interferometer (ASI). The inflection point is removed during optimization for measurability and appearance. In this study, the aspheric CL is successfully designed with Q-type aspheres for the measurability of the interferometer. It not only corrects the myopia but also eliminates the SA for improving the visual acuity in dark based on the schematic eye model.

关键词： aspheric contact lens Q-type aspheres myopia spherical aberration schematic eye model visual acuity best-fit sphere

来源：评论

学校读者我要写书评

暂无评论

Multi-band filter design with less total film thickness for short-wave infrared 18

Multi-band filter design with less total film thickness for ...

引用

Conference on current developments in Lens design and optical engineering XViiI

作者： Yan, Yung-Jhe Chien, I-Pen Chen, Po-Han Chen, Sheng-Hui Tsai, Yi-Chun Ou-Yang, Mang Natl Chiao Tung Univ Dept Elect & Comp Engn Hsinchu Taiwan Natl Cent Univ Dept Opt & Photon Taoyuan Taiwan

ISBN: (纸本)9781510612082;9781510612075

A multi-band pass filter array was proposed and designed for short wave infrared applications. The central wavelength of the multi-band pass filters are located about 905 nm, 950 nm, 1055 nm and 1550 nm. In the simulation of an optical interference band pass filter, high spectrum performance (high transmittance ratio between the pass band and stop band) relies on (1) the index gap between the selected high/low-index film materials, with a larger gap correlated to higher performance, and (2) sufficient repeated periods of high/low-index thin-film layers. When determining high and low refractive index materials, spectrum performance was improved by increasing repeated periods. Consequently, the total film thickness increases rapidly. In some cases, a thick total film thickness is difficult to process in practice, especially when incorporating photolithography liftoff. Actually the maximal thickness of the photoresist being able to liftoff will bound the total film thickness of the band pass filter. For the application of the short wave infrared with the wavelength range from 900nm to 1700nm, silicone was chosen as a high refractive index material. Different from other dielectric materials used in the visible range, silicone has a higher absorptance in the visible range opposite to higher transmission in the short wave infrared. In other words, designing band pass filters based on silicone as a high refractive index material film could not obtain a better spectrum performance than conventional high index materials like TiO2 or Ta2O5, but also its material cost would reduce about half compared to the total film thickness with the conventional material TiO2. Through the simulation and several experimental trials, the total film thickness below 4 um was practicable and reasonable. The fabrication of the filters was employed a dual electric gun deposition system with ion assisted deposition after the lithography process. Repeating four times of lithography and deposition p

关键词： optical interference filter Photolithography Bandpass filter Short-wave infrared

来源：评论

学校读者我要写书评

暂无评论

Proceedings of SPIE - The International Society for optical engineering

Proceedings of SPIE - The International Society for Optical ...

引用

Advances in Computational Methods for X-Ray Optics IV 2017

ISBN: (纸本)9781510612334

The proceedings contain 21 papers. The topics discussed include: recent progress of the synchrotron radiation code SPECTRA;main functions, recent updates, and applications of synchrotron radiation workshop code;interoperability and complementarity of simulation tools for beamline design in the OASYS environment;McXtrace 1.4: latest developments in the new release;x-ray optics simulation and beamline design for the aps upgrade;simulation and optimization of the SIRIUS IPE soft x-ray beamline;optical design and simulation of a new coherence beamline at NSLS-ii;effect of x-ray mirror figure error on the focus profile: comparison of measurements with physical and geometric optics simulations;speckle-based at-wavelength metrology of x-ray optics at diamond light source;stochastic analysis of 1D and 2D surface topography of x-ray mirrors;aberrations in compound refractive lens systems: analytical and numerical calculations;aberrations in compound refractive lens systems: analytical and numerical calculations;x-ray optical simulations supporting advanced commissioning of the coherent hard x-ray beamline at NSLS-ii;a Monte Carlo simulation of scattering reduction in spectral x-ray computed tomography;OASYS (OrAnge SYnchrotron Suite): an open-source graphical environment for x-ray virtual experiments;analysis on partial coherence propagation using the four-dimensional coherence function;a fast and reliable approach to simulating the output from an x-ray tube used for developing security backscatter imaging;and use of simulation to optimize the pinhole diameter and mask thickness for an x-ray backscatter imaging system.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A Novel Protection Strategy for Elastic optical Networks Based on Space Division Multiplexing

A Novel Protection Strategy for Elastic Optical Networks Bas...

引用

International Conference on Signal Processing and Communications, SPCOM

作者： Sridhar Iyer Shree Prakash Singh Department of ECE Jain College of Engineering T.S. Nagar Belagavi KA India Division of ECE Netaji Subhas Institute of Technology Dwarka New Delhi India

ISBN: (纸本)9781538638224

The emergence of elastic optical networks (EONs) has been viewed as a solution to the diverse bandwidth requests that will occur in the next generation's network applications and Internet which are anticipated to handle a traffic growth at a rate greater than Petabit per second level. However, the crunch in fiber capacity will persist owing to use of only two dimensions of multiplexing in the EONs. With the adoption of space division multiplexing (SDM), an extra freedom degree can be used such that the EONs will be able support the required capacity of the future diverse traffic. Further, with an increase in the rate(s) of transmission(s), to counter the network failures, there will occur the need for protection mechanisms, specifically those, which can protect routes and provision solutions which are end-to-end. In the current work, as an intial step for protecting an EON based on SDM, we design a strategy which (i) is independent of the failure(s), and (ii) protects the route(s). We evaluate our proposed strategy considering realistic assumptions, topologies and parameters, and for different traffic load values. The obtained simulation results reveal that (i) our proposed strategy is efficient in provisioning of protection which is pre-configured, and (ii) the considered network topology's node degree significantly affects both, the blocking and the evaluated route's length in the protected EON based on SDM.

关键词： Multiplexing Resource management Bandwidth Routing Next generation networking

来源：评论

学校读者我要写书评

暂无评论

Implementation and first results of the KM3NeT real-time core-collapse supernova neutrino search

arXiv

引用

arXiv 2021年

作者： Aiello, S. Albert, A. Alshamsi, M. Alves Garre, S. Aly, Z. Ambrosone, A. Ameli, F. Andre, M. Androulakis, G. Anghinolfi, M. Anguita, M. Ardid, M. Ardid, S. Aublin, J. Bagatelas, C. Baret, B. Basegmez du Pree, S. Bendahman, M. Benfenati, F. Berbee, E. van den Berg, A.M. Bertin, V. Biagi, S. Boettcher, M. Bou Cabo, M. Boumaaza, J. Bouta, M. Bouwhuis, M. Bozza, C. Brânzaş, H. Bruijn, R. Brunner, J. Bruno, R. Buis, E. Buompane, R. Busto, J. Caiffi, B. Calvo, D. Campion, S. Capone, A. Carretero, V. Castaldi, P. Celli, S. Chabab, M. Chau, N. Chen, A. Cherubini, S. Chiarella, V. Chiarusi, T. Circella, M. Cocimano, R. Coelho, J.A.B. Coleiro, A. Colomer Molla, M. Coniglione, R. Coyle, P. Creusot, A. Cruz, A. Cuttone, G. Dallier, R. de Martino, B. Di Palma, I. Díaz, A.F. Diego-Tortosa, D. Distefano, C. Domi, A. Donzaud, C. Dornic, D. Dörr, M. Drouhin, D. Eberl, T. Eddyamoui, A. van Eeden, T. van Eijk, D. El Bojaddaini, I. El Hedri, S. Enzenhöfer, A. Espinosa, V. Fermani, P. Ferrara, G. Filipović, M.D. Filippini, F. Fusco, L.A. Gal, T. García Méndez, J. Garcia Soto, A. Garufi, F. Gatelet, Y. Gatius Oliver, C. Geißelbrecht, N. Gialanella, L. Giorgio, E. Gozzini, S.R. Gracia, R. Graf, K. Grella, G. Guderian, D. Guidi, C. Guillon, B. Gutiérrez, M. Haefner, J. Hallmann, S. Hamdaoui, H. van Haren, H. Heijboer, A. Hekalo, A. Hennig, L. Hernández-Rey, J.J. Hofestädt, J. Huang, F. Idrissi Ibnsalih, W. Illuminati, G. James, C.W. Janezashvili, D. de Jong, M. de Jong, P. Jung, B.J. Kalaczynski, P. Kalekin, O. Katz, U.F. Khan Chowdhury, N.R. Kistauri, G. van der Knaap, F. Kooijman, P. Kouchner, A. Kulikovskiy, V. Labalme, M. Lahmann, R. Lamoureux, M. Larosa, G. Lastoria, C. Lazo, A. Le Breton, R. Le Stum, S. Lehaut, G. Leonardi, O. Leone, F. Leonora, E. Lessing, N. Levi, G. Lincetto, Massimiliano Lindsey Clark, M. Lipreau, T. LLorens Alvarez, C. Longhitano, F. Lopez-Coto, D. Maderer, L. Majumdar, J. Manczak, J. Margiotta, A. Marinelli, A. Markou, C. INFN Sezione di Catania Via Santa Sofia 64 Catania95123 Italy Université de Strasbourg CNRS IPHC UMR 7178 StrasbourgF-67000 France Université de Paris CNRS Astroparticule et Cosmologie ParisF-75013 France c/Catedrático José Beltrán 2 Valencia Paterna46980 Spain Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France INFN Sezione di Napoli Complesso Universitario di Monte S. Angelo Via Cintia ed. G Napoli80126 Italy Università di Napoli "Federico II" Dip. Scienze Fisiche "E. Pancini" Complesso Universitario di Monte S. Angelo Via Cintia ed. G Napoli80126 Italy INFN Sezione di Roma Piazzale Aldo Moro 2 Roma00185 Italy Universitat Politècnica de Catalunya Laboratori d’Aplicacions Bioacústiques Centre Tecnològic de Vilanova i la Geltrú Avda. Rambla Exposició s/n Vilanova i la Geltrú 08800 Spain NCSR Demokritos Institute of Nuclear and Particle Physics Ag. Paraskevi Attikis Athens 15310 Greece INFN Sezione di Genova Via Dodecaneso 33 Genova16146 Italy University of Granada Dept. of Computer Architecture and Technology/CITIC Granada18071 Spain Universitat Politècnica de València Instituto de Investigación para la Gestión Integrada de las Zonas Costeras C/ Paranimf 1 Gandia46730 Spain Nikhef National Institute for Subatomic Physics PO Box 41882 Amsterdam1009 DB Netherlands University Mohammed V in Rabat Faculty of Sciences 4 av. Ibn Battouta B.P. 1014 R.P Rabat10000 Morocco INFN Sezione di Bologna v.le C. Berti-Pichat 6/2 Bologna40127 Italy Università di Bologna Dipartimento di Fisica e Astronomia v.le C. Berti-Pichat 6/2 Bologna40127 Italy KVI-CART University of Groningen Groningen Netherlands INFN Laboratori Nazionali del Sud Via S. Sofia 62 Catania95123 Italy North-West University Centre for Space Research Private Bag X6001 Potchefstroom2520 South Africa Instituto Español de Oceanografía Unidad Mixta IEO-UPV C/ Paranimf 1 Gandia46730 Spain University Mohammed I Faculty of Sciences BV Mohammed VI B.P. 717 R

The KM3NeT research infrastructure is under construction in the Mediterranean Sea. KM3NeT will study atmospheric and astrophysical neutrinos with two multi-purpose neutrino detectors, ARCA and ORCA, primarily aimed at GeV–PeV neutrinos. Thanks to the multi-photomultiplier tube design of the digital optical modules, KM3NeT is capable of detecting the neutrino burst from a Galactic or near-Galactic core-collapse supernova. This potential is already exploitable with the first detection units deployed in the sea. This paper describes the real-time implementation of the supernova neutrino search, operating on the two KM3NeT detectors since the first months of 2019. A quasi-online astronomy analysis is introduced to study the time profile of the detected neutrinos for especially significant events. The mechanism of generation and distribution of alerts, as well as the integration into the SNEWS and SNEWS 2.0 global alert systems are described. The approach for the follow-up of external alerts with a search for a neutrino excess in the archival data is defined. Finally, an overview of the current detector capabilities and a report after the first two years of operation are given. Copyright © 2021, The Authors. All rights reserved.

关键词： Neutrons

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：