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19th conference on current developments in Lens design and optical engineering

作者： Parthasarathy, Mohana Kuppuswamy Faruq, Ibrahim Arthurs, Eugene Lakshminarayanan, vasudevan Univ Waterloo Sch Optometry & Vis Sci Waterloo ON Canada Costco Opt Waterloo ON Canada SPIE Bellingham WA USA Univ Waterloo Dept Phys Waterloo ON Canada Univ Waterloo Dept ECE Waterloo ON Canada Univ Waterloo Dept Syst Design Engn Waterloo ON Canada

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

The direct ophthalmoscope, a handheld device gives a highly magnified image of the retina. However, the sustainability of power source and cost are a limitation considering the usage demand. We compared a low-cost solar-powered Arclight ophthalmoscope with a standard ophthalmoscope Heine K180 in terms of ease of examination, usage, field of view, color rendition and patient comfort. Two clinically trained optometrists examined 28 patients and graded the ease of retinal examination, ease of use and assessed cup-disc ratio, which is an important diagnostic parameter for glaucoma, patient comfort and length of examination (scale 1-4). The examiners had good agreement for all assessments. Of a total of 78 examinations, only 8(10.3%) did not result in cup-disc ratio measurement in the undilated pupil condition using both devices. Ease of use was scored higher for Arclight than Heine but this was not statistically significant. In conditions like large discs, the Arclight resulted in easier examinations due to its larger field of view. Color rendition was better with the Heine device. In undilated pupils, the patients often reported that there was significant glare with Heine, however, post-dilation, they reported more glare with Arclight compared to Heine (73% versus 55%). The performance of Arclight was comparable to that of Heine and can be considered a low-cost alternative to the standard direct ophthalmoscope especially in large-scale patient examinations in developing countries where cost might be a factor.

关键词： Direct Ophthalmoscope Retina ophthalmology cup to disc ratio Arclight ophthalmoscope Heine ophthalmoscope solar powered ophthalmoscope

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Integral Active Element for Transmitting optical Modules

Integral Active Element for Transmitting Optical Modules

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IEEE conference of Russian Young Researchers in Electrical and Electronic engineering (ElConRus)

作者： Dem'yanenko, Alexander v. Southern Fed Univ Dept Antennas & Radio Transmitting Devices Taganrog Russia

ISBN: (纸本)9781538643402

With the development of injection semiconductor lasers (ISL) that generates electromagnetic energy in the optical range, a possibility of miniaturization of data transmission and processing systems operating at frequencies of 1014 Hz and higher has emerged. The current state of solid-state laser technology makes it possible to talk about modulation frequencies up to 30 GHz. It gives the possibility of development of optical microwave modulators, and providing radio transmitting devices of the optical range with a basic element base. In the present work, a prototype of a new optoelectronic device is proposed, that combines two generator elements in a single package, providing simultaneous generation of a carrier and modulating oscillations. In such a device, microwave modulation of the ISL occurs based on internal physical mechanisms, as a result of coupling between the generating crystals. The design of a multifunctional optoelectronic device and its operating principle are discussed.

关键词： generation optical oscillator modulation integral module

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v-shaped Nano-Antennas on Titanium Dioxide as a Tunable Plasmonic Lens 26

V-shaped Nano-Antennas on Titanium Dioxide as a Tunable Plas...

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26th Iranian conference on Electrical engineering (ICEE)

作者： Rafaei-Booket, Mahmood Bozorgi, Mahdieh Univ Zanjan Fac Elect & Comp Engn Zanjan Iran

ISBN: (纸本)9781538649169

A tunable planar lens metasurface composed of a gold array on a Titanium dioxide slab is presented. Each cell of such a structure comprised of a v-shaped gold nano-antenna on a uniaxial anisotropic substrate. In the design of such a planar lens, the phase diagram of the cross-polarized scattered field is obtained using a spectral domain calculation based on dyadic Green's function. This function, which is obtained by employing the transmission line (TL) model, appears in an integral equation. By solving the integral equation using Galerkin's Method of Moments (MoM) with the appropriate entire domain functions, the effective surface current densities on the gold array is determined. A series of v-shaped elements with the different dimensions are selected, based on the equal optical length principle, to satisfy the phase discontinuities of each cell. Finally, the lens metasurface illuminated by the plane wave is analyzed by using an electromagnetic simulator. The obtained results indicate the optic axis rotation of the anisotropic substrate leads to controlling the intensity of the lens focuses.

关键词： anisotropic substrate dyadic Green's function metasurface Method of Moments tunable plasmonic lens

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A Solid Multifunctional Optoelectronic Device

A Solid Multifunctional Optoelectronic Device

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IEEE conference of Russian Young Researchers in Electrical and Electronic engineering (ElConRus)

作者： Dem'yanenko, Alexander v. Southern Fed Univ Dept Antennas & Radio Transmitting Devices Taganrog Russia

ISBN: (纸本)9781538643402

关键词： generation optical oscillator modulation integral module

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Light-Trap: A SiPM upgrade for very high energy astronomy and beyond

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NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 2018年 912卷 61-63页

作者： Guberman, D. Cortina, J. Ward, J. E. Barcelona Inst Sci & Technol IFAE Campus UAB Bellaterra 08193 Barcelona Spain

The Imaging Atmospheric Cherenkov Technique (IACT) has turned Gamma-ray astronomy into a flourishing branch of astrophysics. current IACT telescope arrays (MAGIC, H.E.S.S, vERITAS) use photomultiplier tubes (PMTs) to detect the optical/near-Uv Cherenkov radiation emitted due to the interaction of gamma rays with the atmosphere. Replacing PMTs with Silicon photomultipliers (SiPMs) is being considered for the next generation of IACT experiments. Among the main drawbacks are the limited physical area of SiPMs (increases the cost and the complexity of the readout of a camera) and their sensitivity to unwanted wavelengths. Here we propose a novel method to build a relatively low-cost pixel consisting on a SiPM attached to a PMMA disk doped with a wavelength-shifting material, which collects light over a much larger area than standard SiPMs with improved sensitivity to near-Uv light and background rejection. We describe the design of a detector that could also open new opportunities in other areas where detection area and cost are crucial. (C) 2017 Elsevier B.v. All rights reserved.

关键词： Photon detectors for Uv Scintillators Scintillation and light emission processes Detector design

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Parametric 3D Modeling of Low Perveance Elleptical Electron Beams for Devices of THz Range

Parametric 3D Modeling of Low Perveance Elleptical Electron ...

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2018 International conference on Actual Problems of Electron Devices engineering, APEDE 2018

作者： Navrotsky, I.A. Burtsev, A.A. Danilushkin, A.v. JSC SPE Almaz Saratov Russia

ISBN: (纸本)9781538643327

This report presents the results of 3D modeling of an electron optical system with low perveance electron elliptical beams. The comparison of triple elliptical beams with continuous sheet and elliptical beams has been conducted. The studied systems have a triode design with an anode potential of 20 kv and a grid potential of 950 v. The total current of electron beams is a 93 mA. Results of 3D modeling show that using of electron optical system forming triple elliptical beams in THz devices permits to achieve a high current transmission through a beam tunnel of a slow-wave structure with a dimension of 140×2500 μm2 and provide interaction with the higher transverse mode of three RF field variations. © 2018 IEEE.

关键词： 3D modeling

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Microbial fuel cells: recent developments in design and materials

Microbial fuel cells: recent developments in design and mate...

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International conference on Recent Advances in Materials, Mechanical and Civil engineering (ICRAMMCE)

作者： Bhargavi, G. venu, v. Renganathan, S. Anna Univ Dept Biotechnol Madras Tamil Nadu India Marri Laxman Reddy Inst Technol & Management Dept Mech Engn Hyderabad 500043 Telangana India

Microbial Fuel Cells (MFCs) are the promising devices which can produce electricity by anaerobic fermentation of organic/inorganic matter from easily metabolized biomass to complex wastewater using microbes as biocatalysts. MFC technology has been found as a potential technology for electricity generation and concomitant wastewater treatment. However, the high cost of the components and low efficiency are barricading the commercialization of MFC when compared with other energy generating systems. The performance of an MFC is largely relying on the reactor design and electrode materials. On the way to improve the efficiency of an MFC, tremendous exercises have been carried out to explore new electrode materials and reactor designs in recent decades. The current review is excogitated to amass the progress in design and electrode materials, which could bolster further investigations on MFCs to improve their performance, mitigate the cost and successful implementation of technology in field applications as well.

关键词： Microbial fuel cells

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The optimization of technology ITO layers for thin-film solar cells 14

The optimization of technology ITO layers for thin-film sola...

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14th International conference on Advanced Trends in Radioelecrtronics, Telecommunications and Computer engineering (TCSET)

作者： Khrypunov, G. Sokol, E. Kudii, D. Khrypunov, M. Natl Tech Univ Kharkov Polytech Inst Kharkov Ukraine

ISBN: (纸本)9781538625569

The fulfilled optimization of ITO films for their using in the effective CdS/CdTe base solar cell design allowed to establish, that maximum figure of merit (8,0.10(-4) Ohm(-1)) is characteristic for the layers deposited at the substrate temperature 400 degrees C. The optimization of the layer optical and electrical properties is ensured by the top main charge carrier mobility mu=44 cm(2)/(v.s) and the maximum transmittance of heterosystcm ITO/Poly in the visible range T400-800 = 0.61.

关键词： ITO films solar cell visible range substrate temperature direct current magnetron sputtering

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design and implementation of A power conversion system on A bicycle with utilisation by sensors 2

Design and implementation of A power conversion system on A ...

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2nd International conference on I-SMAC (IoT in Social, Mobile, Analytics and Cloud), I-SMAC 2018

作者： Prabhu, Rohith S. vasudev, Neeraj Nandu, v. Lokesh, K.J. Anudev, J. Department of Electrical and Electronics Engineering Amrita School of Engineering Amrita Vishwa Vidyapeetham Amritapuri India

ISBN: (纸本)9781538614426

It is evident that the rate of cycling nowadays has reduced even though the benefits are lump sum. Being physically active has posed to be a challenge in the current generation. Power that is developed from human beings can be manipulated for major developments in any country. Heart related diseases, obesity, sugar levels and many major illnesses can be taken under control by regular physical activity. This paper focuses on design and implementation of a cycle that can be used as a routine basis where the user is able to generate power by cycling. Such a design that is ergonomic, efficient and safe for use in normal livelihood. Physical activity monitoring systems, energy consumed, conversion systems are designed and implemented here. © 2018 IEEE.

关键词： Accelerometers

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Low Power Dynamic Comparator design for High Speed ADC Application

Low Power Dynamic Comparator Design for High Speed ADC Appli...

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2018 International conference on current Trends towards Converging Technologies, ICCTCT 2018

作者： Arunkumar, K. Ramesh, R. Geethalakshmi, R. Archana, T. Department of ECE Saveetha Engineering College Chennai India

ISBN: (纸本)9781538637012

Comparator is the heart of Analog to Digital Converter (ADC). In order to design a ultra less power consuming, small delay ADC it force us to design a dynamic comparator to maximize power efficiency and speed. The main use of comparator in ADC be comparison of a given input continuous analog signal along with certain threshold signal to give a output signal depend on whether the analog signal is higher or lower than the threshold signal. Here paper designs a pre-amplifier based comparator utilizing cadence tool. In this proposed design the MOS transistor of length 180nm and width of 720nm and the power supply in the range 1.2v to 1.8v were used. Here the proposed deign has been implemented in various CMOS families using cadence virtuoso 180nm CMOS technology its performance has been simulated and compared to choose the best among them based on power consumption and delay. From the comparison table, it is concluded that the proposed dynamic circuit that is un footed consumes the least power of 51.3μW with the delay of 208pS. © 2018 IEEE.

关键词： Comparators (optical)

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