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Conference on current developments in Lens design and optical engineering Xv

作者： Santiago-Alvarado, Agustin Cruz-Felix, Angel S. Iturbide-Jimenez, F. Martinez-Lopez, M. Ramirez-Como, M. Armengol-Cruz, v. vasquez-Baez, I. Mixteca Technol Univ Huajuapan De Leon 69000 Oax Mexico

ISBN: (纸本)9781628412192

Tunable lenses are optical systems that have attracted much attention due to their potential applications in such areas like ophthalmology, machine vision, microscopy and laser processing. In recent years we have been working in the analysis and performance of a liquid-filled variable focal length lens, this is a lens that can modify its focal length by changing the amount of water within it. Nowadays we extend our study to a particular adaptive lens known as solid elastic lens (SEL) that it is formed by an elastic main body made of Polydimethylsiloxane (PDMS Sylgard 184). In this work, we present the design, simulation and analysis of an adaptive solid elastic lens that in principle imitates the accommodation process of the crystalline lens in the human eye. For this work, we have adopted the parameters of the schematic eye model developed in 1985 by Navarro et al.;this model represents the anatomy of the eye as close as possible to reality by predicting an acceptable and accurate quantity of spherical and chromatic aberrations without any shape fitting. An opto-mechanical analysis of the accommodation process of the adaptive lens is presented, by simulating a certain amount of radial force applied onto the SEL using the finite element method with the commercial software SolidWorks (R). We also present ray-trace diagrams of the simulated compression process of the adaptive lens using the commercial software OSLO (R).

关键词： Solid elastic lens tunable lens crystalline lens PDMS

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Multi-aperture microoptical system for close-up imaging 15

Multi-aperture microoptical system for close-up imaging

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Conference on current developments in Lens design and optical engineering Xv

作者： Berlich, Rene Brueckner, Andreas Leitel, Robert Oberdoerster, Alexander Wippermann, Frank Braeuer, Andreas Fraunhofer Inst Appl Opt & Precis Engn D-07745 Jena Germany

ISBN: (纸本)9781628412192

Modern applications in biomedical imaging, machine vision and security engineering require close-up optical systems with high resolution. Combined with the need for miniaturization and fast image acquisition of extended object fields, the design and fabrication of respective devices is extremely challenging. Standard commercial imaging solutions rely on bulky setups or depend on scanning techniques in order to meet the stringent requirements. Recently, our group has proposed a novel, multi-aperture approach based on parallel image transfer in order to overcome these constraints. It exploits state of the art microoptical manufacturing techniques on wafer level in order to create a compact, cost-effective system with a large field of view. However, initial prototypes have so far been subject to various limitations regarding their manufacturing, reliability and applicability. In this work, we demonstrate the optical design and fabrication of an advanced system, which overcomes these restrictions. In particular, a revised optical design facilitates a more efficient and economical fabrication process and inherently improves system reliability. An additional customized front side illumination module provides homogeneous white light illumination over the entire field of view while maintaining a high degree of compactness. Moreover, the complete imaging assembly is mounted on a positioning system. In combination with an extended working range, this allows for adjustment of the system's focus location. The final optical design is capable of capturing an object field of 36x24 mm(2) with a resolution of 150 cycles/mm. Finally, we present experimental results of the respective prototype that demonstrate its enhanced capabilities.

关键词： Multi-aperture imaging microoptics multi-channel optical design image sensors

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Numerical simulation for horizontal subsurface flow constructed wetlands: A short review including geothermal effects and solution bounding in biodegradation procedures

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AIP Conference Proceedings 2016年第1期1773卷

作者： K. Liolios v. Tsihrintzis P. Angelidis K. Georgiev I. Georgiev Institute of Information and Communication Technologies Bulgarian Academy of Sciences Sofia Bulgaria Department of Infrastructure and Surveying Engineering School of Rural and Surveying Engineering National Technical University of Athens Athens Greece Laboratory of Hydraulics and Hydraulic Works Department of Civil Engineering Democritus University of Thrace Xanthi Greece Institute of Mathematics and Informatics Bulgarian Academy of Sciences Sofia Bulgaria

current developments on modeling of groundwater flow and contaminant transport and removal in the porous media of Horizontal Subsurface Flow Constructed Wetlands (HSF CWs) are first reviewed in a short way. The two usual environmental engineering approaches, the black-box and the process-based one, are briefly presented. Next, recent research results obtained by using these two approaches are briefly discussed as application examples, where emphasis is given to the evaluation of the optimal design and operation parameters concerning HSF CWs. For the black-box approach, the use of Artificial Neural Networks is discussed for the formulation of models, which predict the removal performance of HSF CWs. A novel mathematical prove is presented, which concerns the dependence of the first-order removal coefficient on the Temperature and the Hydraulic Residence Time. For the process-based approach, an application example is first discussed which concerns procedures to evaluate the optimal range of values for the removal coefficient, dependent on either the Temperature or the Hydraulic Residence Time. This evaluation is based on simulating available experimental results of pilot-scale units operated in Democritus University of Thrace, Xanthi, Greece. Further, in a second example, a novel enlargement of the system of Partial Differential Equations is presented, in order to include geothermal effects. Finally, in a third example, the case of parameters uncertainty concerning biodegradation procedures is considered and the use of upper and a novel approach is presented, which concerns the upper and the lower solution bound for the practical draft design of HSF CWs.

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Uv Organic Semiconductor Photoconductor with Low Dark current at High Electric Field

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MRS Online Proceedings Library 2015年第1期1698卷 53-58页

作者： Shafique, Umar Karim, Karim S. Department of Electrical and Computer Engineering Nanotechnology Program University of Waterloo Waterloo Canada Center for Bioengineering and Biotechnology (CBB) University of Waterloo Waterloo Canada

Organic semiconductor technology paves the way to low cost lightweight, flexible, printable electronics circuits and sensors. A novel lateral multilayer organic semiconductor photosensor is fabricated using small molecule organic semiconductor. A specialized interface layer is introduced between the metal electrodes and the organic semiconductor layer. The interface layer material is a large band gap and low electronic conductivity material. The use of interface layer limits the charge injection from the electrodes to the organic semiconductor and overall improves the photosensor dark current performance with an additional advantage to apply high voltage for improved collection. This design has low dark current with high photo-to-dark current ratio and can be set to high bias mode of operation. Lateral interdigitated photodetector, with bottom contact Metal Semiconductor Metal (MSM) is fabricated consisting of interface layer and organic semiconductor bilayer. Small molecule organic semiconductor 3,4,9,10 perylenetetracarboxylic bisbenzimidazole (PTCBI) and Copper-Phthalocyanine (CuPc) are used as the active bilayer, where as polyamide forms the interface layer. current through the sensor is measured in both dark and in light (wavelength 400nm). The dark current density in a 1mm2 photosensor area with 5µm lateral electrode spacing at 10v/µm measured equal to 10−5mA/cm2 and a photocurrent density of 10−3 mA/cm2 under 0.3mW/cm2 incident optical power. The photo to dark current ratio is measured to be equal to ~103. This photosensor has an application in large area imaging for example portable lightweight detectors. Other applications of this sensor include indirect medial imaging and as a biosensor in Uv Spectroscopy study of bacteria cultures.

关键词： organic photoconductivity sensor

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Motion compensation in a tomographic ultrasound imaging system: toward volumetric scans of a limb for prosthetic socket design

Motion compensation in a tomographic ultrasound imaging syst...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： Bryan J. Ranger Micha Feigin Nikita Pestrov Xiang Zhang victor Lempitsky Hugh M. Herr Brian W. Anthony the Harvard-MIT Health Sciences and Technology Program Massachusetts Institute of Technology and Harvard Medical School Cambridge MA 02139 USA the Department of Media Arts and Sciences Massachusetts Institute of Technology Cambridge MA 02139 USA the Skolkovo Institute of Science and Techonology Skolkovo 143025 Russian Federation the Department of Mechanical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA the Department of Media Arts and Sciences and Harvard-MIT Health Sciences and Technology Program Massachusetts Institute of Technology and Harvard Medical School Cambridge MA 02139 USA

ISBN: (纸本)9781424492695

current methods of prosthetic socket fabrication remain subjective and ineffective at creating an interface to the human body that is both comfortable and functional. Though there has been recent success using methods like magnetic resonance imaging and biomechanical modeling, a low-cost, streamlined, and repeatable process has not been fully demonstrated. Medical ultrasonography, which has significant potential to expand its clinical applications, is being pursued to acquire data that may quantify and improve the design process and fabrication of prosthetic sockets. This paper presents a new multi-modal imaging approach for acquiring volumetric images of a human limb, specifically focusing on how motion of the limb is compensated for using optical imagery.

关键词： human body that limb is compensated using optical imagery

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Towards Collaborative Plant Control using a Distributed Information and Interaction Space

Towards Collaborative Plant Control using a Distributed Info...

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IEEE Conference on Emerging Technologies and Factory Automation

作者： Johannes Pfeffer Markus Graube Patrick Reipschlaeger Stephan Arndt Leon Urbas Raimund Dachselt Ralph Stelzer Chair of Process Control Systems Engineering Technische Universitat Dresden Interactive Media Lab Dresden Technische Universitat Dresden Chair of Engineering Design and CAD Technische Universitat Dresden

ISBN: (纸本)9781467379304

As Smart Manufacturing, Industrial Internet, Industrie 4.0, and Cyber-Physical Production System (CPPS) are becoming reality, the way process and manufacturing plants are operated has to change. Additionally, these developments - constituting the pervasive digitalisation of industry - have a profound effect on the way human workers and machines interact. This paper contrasts the current state of the art in plant control with a vision for the future. The scenario is illustrated by a realistic problem-solving process in a chemical plant. It describes an integrated industrial information and interaction space that leverages emerging technologies to enable plant operators to remain in control of future flexible modularised process plants. Our approach shows the advantages of an integrated information space which feeds interaction and collaboration using virtual Reality (vR), novel display technologies and mobile devices.

关键词： Plant control interaction space information space Manufacturing plants chemical plant Leverage DISPLAYING Mobile devices state of the art current status machine Arts Sight

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Proceedings of SPIE - The International Society for optical engineering

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

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current developments in Lens design and optical engineering Xv

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基于TPS40055控制的新型同步BUCK电路设计

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电视技术 2015年第9期39卷 57-60页

作者：张雪莲梁小红黄榜才张鹏张培培王晓龙龙润泽韩桂云中国电子科技集团公司第四十六研究所天津300220

针对传统电源驱动电路启动慢,效率低,工作电流小,而目前光纤激光电源技术进入高集成化、高响应发展趋势的特点,提出了一种基于TPS40055控制的新型同步BUCK电路设计,可实现PWM及电流可调3路直流电源输出,各路电压分别为3.3v、5v、10 v,... 详细信息

针对传统电源驱动电路启动慢,效率低,工作电流小,而目前光纤激光电源技术进入高集成化、高响应发展趋势的特点,提出了一种基于TPS40055控制的新型同步BUCK电路设计,可实现PWM及电流可调3路直流电源输出,各路电压分别为3.3v、5v、10 v,电流为0∽11 A可调,能驱动不同型号大功率光纤激光器工作.从电路总体方案、工作原理、参数设计及优化等方面介绍此新型电源电路设计.结果证明,该设计能提供高效、可靠、稳定的激光器直流电源.

关键词： TPS40055 同步BUCK PWM 大功率

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Organic photovoltaics: key photophysical, device and design aspects

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JOURNAL OF MODERN OPTICS 2014年第21期61卷 1703-1713页

作者： Joshi, Dhruv Shivanna, Ravichandran Narayan, K. S. Indian Inst Sci Jawaharlal Nehru Ctr Adv Sci Res Chem & Phys Mat Unit Bangalore 560012 Karnataka India

Key aspects of Organic Photovoltaics (OPvs) have been reviewed in this tutorial. Issues pertaining to the choice of materials, fabrication processes, photophysical mechanisms, device characterization, morphology of active layers and manufacturing are discussed. Special emphasis has been given to recent developments in large-area modules. current strategies in enhancing the performance using external optical engineering approaches have also been highlighted. OPvs as a technology combine low weight, flexibility, low cost, good form factor and high-throughput processing;making them a promising Pv technology for the future.

关键词： organic photovoltaics photonics printed solar cells

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Which principles should guide a new technological wave?

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HERALD OF THE RUSSIAN ACADEMY OF SCIENCES 2014年第2期84卷 92-105页

作者： Toumanov, Yu. N. Tochilin, S. B. Dedov, N. v. Natl Res Ctr Kurchatov Inst Moscow Russia

The burning topic of all current and not only scientific discussions is the preservation of the habitat for all living things on the earth. This problem concerns every human being who deals with production processes and the inevitable destructive impact of production waste on the environment. Attempts are being made to design waste-free technologies. One such example is the developments in which the authors of this article participate, which can be used when modernizing Russian chemical-engineering and metallurgical factories.

关键词： New Technological Wave Crisis opinion Manufacturing Facilities Energy efficiency waves Guiding devices Principle-Based Ethics model design new technology

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