检索结果-内蒙古大学图书馆

conference on current developments in Lens design and optical engineering XX

作者： Garcia-Lievanos, O. Teran-Bobadilla, Emiliano Hernandez-Flores, Luis A. Sanchez-Gonzalez, Leticia Inst Politecn Nacl Ctr Interdisciplinario Ciencias Salud Unidad Santo Tomas Dept Optometry Av Maestros S-N Mexico City 11340 DF Mexico Univ Autonoma Sinaloa Dept Optometry Culiacan Rosales 80040 Sininaloa Mexico

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

To compensate the spherical aberration of the eye using the conic constant of the first surface of a contact lens for different refractive errors. Refractive errors were simulated by modifying only the first curvature of the cornea. For every refractive error was calculating Zernike polynomials using Optics Software for Layout and Optimization (OSLO) EDU edition with and without contact lens. To calculate the conic constant of the contact lens we use the Seidel sums for thin lenses from the longitudinal spherical aberration as it proposes v. Mahajan. The value of Zernike spherical aberration coefficient for the eye with farsightedness (+ 5.00 D) + spherical contact lens was 0.142691 mu m. The conic constant value to compensate the spherical aberration was -0.222995 and the value of Zernike spherical aberration coefficient of the eye + aspherical contact lens was 0.004354 mu m. The value of Zernike spherical aberration coefficient for the eye with myopia (- 5.00 D) + spherical contact lens was 0.144505 mu m. The conic constant value to compensate the spherical aberration was -0.101424 and the value of Zernike spherical aberration coefficient of the eye + aspherical contact lens was 0.072820 mu m. The proposed method allows us to design contact lenses that compensate for the spherical aberration of the eye from the Zernike polynomials. Although the design of contact lenses is to third order, we obtain a smaller spherical aberration than the chromatic aberration on the axis without use optimization routine.

关键词： Contact lens spherical aberration aberration of the eye and Zernike polynomials

来源：评论

学校读者我要写书评

暂无评论

Smart LED Streetlighting System with Improved Power Quality and Low Standby Consumption 3

Smart LED Streetlighting System with Improved Power Quality ...

引用

3rd International conference on Recent developments in Control, Automation and Power engineering (RDCAPE)

作者： Jha, Aman STMicroelect Pvt Ltd SRA SAIL Delhi India

ISBN: (纸本)9781728120683

This paper describes the main characteristics of an 80W constant current smart LED driver which works in 6LoWPAN mesh networking. The power supply capable to drive LED voltage of very wide output range (60v-110v) as well as a wide input range (90v-300vAC) with very high displacement power factor and very low input current distortion power factor. The free band radio range limitation is overcome by using 6LoWPAN mesh network to control light remotely using microcontroller and SubGHz wireless module. The standby consumption of power supply is less than 500mW which follow EnergyStar norms set by international agency.

关键词： AC-DC Converter Flyback Converter Intergared Switch LED Lighting Magentics design

来源：评论

学校读者我要写书评

暂无评论

design Model to Improve Task Scheduling in Cloud Computing Based on Particle Swarm Optimization

Design Model to Improve Task Scheduling in Cloud Computing B...

引用

2020 IEEE conference of Russian Young Researchers in Electrical and Electronic engineering, EIConRus 2020

作者： Khodar, Almothana Chernenkaya, Liudmila v. Alkhayat, Iyad Fadhil Al-Afare, Hazim Abdulameer Desyatirikova, Elena N. Voronezh State University Dept. of Computer Science Voronezh Russia Peter the Great St. Petersburg Polytechnic University Highest School of Cyberphysic Control Systems St. Petersburg Russia Damascus University Dept. of Information Systems and Networks Damascus Syria Middle Technical University Dept. of Computer Systems Baghdad Iraq

ISBN: (纸本)9781728157610

Cloud computing is one of the most modern innovations that are growing rapidly in all technical fields because of its advantages in securing multiple resources and high speed in performance. It provides users connected via the Internet with a variety of storage and computing supplies. Cloud computing is both a catalyst and an enabler for major technological developments such as mobile computing, big data, and machine learning. With all these features, task scheduling has become one of the most difficult challenges facing the cloud, It plays a key role in the effectiveness of all cloud computing tools. Scheduling tasks means allocating tasks to the suitable virtual machine so that the course of computation can be executed to satisfy QoS constraints defined by users such as time to finish and expense. Most current optimization algorithms focus on only one aspect. In this paper, Depending on the characteristics of the swarm algorithm we will develop a model to solve the dilemma of task scheduling as well in order to get the fastest time to transfer tasks and the fastest time for execution with the lowest possible expense. In addition to that, we will develop a multi-purpose algorithm based on the PSO method to provide an optimal solution for the proposed model. The experimental consequences of this paper demonstrate that the proposed manner is more efficacious in expediting tasks and reducing expenses. © 2020 IEEE.

关键词： Cloud computing

来源：评论

学校读者我要写书评

暂无评论

A simulation study of optoelectronic characteristics of bilayer graphene/ZnO nanowires heterojunction based photodetector in Uv spectral region

引用

AIP conference Proceedings 2024年第1期3217卷

作者： Shonak Bansal Anupma Gupta Manish Kumar Singla Manish Sharma Ajay Kumar Sarita Rathee Parveen Kumar Department of Electronics & Communication Engineering Chandigarh University Gharuan Chandigarh India Department of Interdisciplinary Courses in Engineering Chitkara University Rajpura Punjab India Chitkara University Institute of Engineering and Technology Chitkara University Rajpura Punjab India Department of Mechanical Engineering School of Engineering & Technology JECRC University Jaipur - 303905 India Department of Electronics and Communication Engineering School of Engineering & Technology JECRC University Jaipur - 303 905 India Department of Mechanical Engineering Rawal Institute of Engineering and Technology Faridabad Haryana India

This paper introduces a research study carried out under ambient room temperature conditions. The study primarily investigates the photodetection properties related to electronic and ultraviolet (Uv) optical responses in a photodetector built on an optimized heterojunction of p+-bilayer-graphene(BLG) and n–-zinc-oxide(ZnO) nanowires (NWs). The design and analysis of this photodetector are performed using the Silvaco Atlas TCAD software. The p+- BLG and n–-ZnO NWs heterojunction demonstrate a favorable photodetector rectification efficiency of 1.8×104 at ±1 v. Additionally, it showcases a low zero-bias dark-current-density of 1.2 µA/cm² along with a remarkable Jlight/Jdark ratio of 4.6×104. The photoswitching response time of 0.32 ns with a 3-dB cut-off frequency of 1.1 GHz is achieved for the proposed photodetector at –0.5 v. Moreover, the photodetector achieves a peak external quantum efficiency of 42%, a peak external photocurrent responsivity of 0.11 A/W, and a peak specific detectivity of 1.52×109 Jones –1.0 v and is better than previously reported results. The proposed photodetector based on nanowires holds significant promise for its application as a next-generation optoelectronic device.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Wide Band Transimpedance Amplifier using Class AB FvF 3

Wide Band Transimpedance Amplifier using Class AB FVF

引用

3rd International conference on Recent developments in Control, Automation and Power engineering (RDCAPE)

作者： Singh, Nidhi Niranjan, vandana Indira Gandhi Delhi Tech Univ Women Dept Elect & Commun Engn New Delhi India

ISBN: (纸本)9781728120683

CMOS technologies have swiftly ameliorated across the past few years. To meet the demand of high performance applications like compact disc players, high definition television (HDTv), radar, medical imaging etc., this employs info conversion system for processing at later stages. Accuracy is highly desirable in many functional systems like optical communication, military surveillance etc. In optical communication system, transimpedance amplifier (TIA) is the fundamental part of optical receiver which is required to convert the low level current signal from the photodiode to an operable output voltage for further processing. Here in this paper, we propose a CMOS TIA using class-AB flipped voltage follower having less output resistance. Simulation results of the proposed circuit in 0.18 mu m technology depicts that the bandwidth and the transimpedance gain obtained are increased by 3.3 times and 1.03 times respectively.

关键词： Flipped voltage follower (FvF) optical Receiver Transimpedance amplifier (TIA) low voltage low power design

来源：评论

学校读者我要写书评

暂无评论

optical Systems for Large-aperture Phased Laser Array Including Diffractive Optics 20

Optical Systems for Large-aperture Phased Laser Array Includ...

引用

conference on current developments in Lens design and optical engineering XX

作者： Erlikhman, Jacob Krogen, Peter Srinivasan, Prashant Hettel, Will Meinhold, Peter Lubin, Philip Univ Calif Santa Barbara Dept Phys Broida Hall Santa Barbara CA 93106 USA

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

Directed energy propulsion for interstellar travel has been proposed as an ideal method for reaching appreciable speeds relative to the speed of light: 0.2c. However, the amount of energy required necessitates a large aperture, on the order of kilometers, while mitigation of atmospheric perturbations requires a discretization of the aperture into many individual laser elements. The use of fiber lasers for these elements obligates mode-matching the fiber to the desired 10 cm aperture for a collimated beam. various collimation systems were designed and compared. A 3-lens system with one achromat and two aspheric lenses, with two of the lenses used as a Keplerian telescope to achieve a system-shortening effect was analyzed. A similar system made with a plano-convex lens replacing the large-aperture aspheric lens with two additional compensating lenses was compared. A single diffractive optic operating at F/8 was likewise considered. The optical performance of these systems was compared, as was the cost-effectiveness. Scalability to millions of elements was required, so cost-per-system was a crucial consideration factor. Possible manufacturing processes for a diffractive system were investigated, and stamping processes for replication were analyzed to determine the possibility of replication of such an optic reliably, cheaply, and with acceptable results.

关键词： Directed energy optical design diffractive optical elements corrective optical elements laser propulsion

来源：评论

学校读者我要写书评

暂无评论

Freeform Optics design of Primary Lens for Uniform Irradiance Distribution of Concentrator Photovoltaic System 20

Freeform Optics Design of Primary Lens for Uniform Irradianc...

引用

conference on current developments in Lens design and optical engineering XX

作者： Pham Thanh Tuan Duy, N. N. vu Ngoc Hai Shin, Seoyong Myongji Univ Dept Informat & Commun Engn Gyeonggi Do 17058 South Korea Vietnam Acad Sci & Technol Inst Appl Mat Sci Ho Chi Minh City 70072 Vietnam Phenikaa Univ Elect & Elect Engn Hanoi 1000 Vietnam Duy Tan Univ Fac Nat Sci Danang 550000 Vietnam

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

In this paper, a primary lens of concentrator photovoltaic (CPv) system is designed by using freeform optics. The designed lens is constructed based on a basic idea of a combination of Fresnel lens and freeform optics, in which the lens is divided into an array of sub-lenses, which are designed using the conservation of optical path length and the edge ray theorem to get uniform irradiance distribution over the receiver. In this design, every sub-lens is designed to guide the direct sunlight over the receiver with uniform irradiance so that the whole of the primary lens will converge uniformly the direct sunlight over the receiver. The structure of the lens is designed firstly by using Matlab program for every sublens. The Matlab data of the designed lens structure is then used to build the three-dimensional (3D) lens in LightTools (TM) software. The ray tracing technique in LightTools (TM) software is used to find out the optimum structure of the freeform lens. Furthermore, the simulation is performed to estimate the efficiency of the lens as a concentrator of a CPv system by using the light source with the sunlight spectrum. The designed lens can achieve high geometrical concentration ratio and uniform irradiance distribution over the receiver. The simulation results show that the lens can easily reach a high concentration ratio (494 times) with uniform irradiance distribution and good optical efficiency (86%).

关键词： Concentrator photovoltaic (CPv) Primary lens Freeform optics Sub-lenses array Uniform irradiance distribution

来源：评论

学校读者我要写书评

暂无评论

design of Pyroelectric Infrared Detector And Micropower CMOS Integrated Circuitry Towards a Monolithic Gas Sensor 46

Design of Pyroelectric Infrared Detector And Micropower CMOS...

引用

46th Annual conference of the IEEE-Industrial-Electronics-Society (IECON)

作者： Zhang, Tan-Tan Ng, Doris Keh Ting Cai, Hong Gao, Yuan ASTAR Inst Microelect Singapore Singapore

ISBN: (数字)9781728154145

ISBN: (纸本)9781728154145

With the emerging trend in miniaturization of complete optical sensor on a silicon platform for gas sensing applications, this paper presents a promising candidate towards monolithic gas sensor with features of 1) a CMOS compatible Aluminum Nitride (AlN)-based pyroelectric infrared detector (PID);2) customized micropower high-precision CMOS integrated readout circuits. In the PID design, the sensitivity and device integrity are improved with optimized sensing area and modified layer structure. In the readout circuits, to amplify the pico- amperes current from detector, a tunable resistive transimpedance amplifier (TIA) with robust pseudo-resistor in series is proposed to achieve reduced variations against process-voltage-temperature (PvT). A micropower incremental analog-to-digital converter (ADC) is designed to digitize the voltage output from TIA. In addition, to compensate the drifts induced by local temperature change around the detector, an accurate BJT-based temperature sensor is integrated in the circuits as well. Fabricated in an 8-inch wafer, the AlN-based PID with sensing area of 0.29 mm(2) achieves the detectivity of 6.04x 10(6) cm root Hz/W. The readout circuits are implemented in a 40nmCMOS process, consuming total power of 24.5 mu W under 1.2-v supply. Simulation results show that the TIA gain variation is <0.5 dB over PvT corners, the ADC achieves >11-bit resolution over 1 kHz bandwidth, and the temperature error over - 20 degrees C 80 degrees C is +/- 0.65 degrees C (3 sigma) without any calibration.

关键词： ADC emitter detector monolithic gas sensor pyroelectric transimpedance amplifier temperature sensor

来源：评论

学校读者我要写书评

暂无评论

D-Egg: a Dual PMT optical Module for the IceCube Upgrade 38

D-Egg: a Dual PMT Optical Module for the IceCube Upgrade

引用

38th International Cosmic Ray conference, ICRC 2023

作者： Abbasi, R. Ackermann, M. Adams, J. Agarwalla, S.K. Aguilar, J.A. Ahlers, M. Alameddine, J.M. Amin, N.M. Andeen, K. Anton, G. Argüelles, C. Ashida, Y. Athanasiadou, S. Axani, S.N. Bai, X. Balagopal, A.A. Baricevic, M. Barwick, S.W. Basu, v. Bay, R. Beatty, J.J. Becker Tjus, J. Beise, J. Bellenghi, C. Benning, C. BenZvi, S. Berley, D. Bernardini, E. Besson, D.Z. Blaufuss, E. Blot, S. Bontempo, F. Book, J.Y. Boscolo Meneguolo, C. Böser, S. Botner, O. Böttcher, J. Bourbeau, E. Braun, J. Brinson, B. Brostean-Kaiser, J. Burley, R.T. Busse, R.S. Butterfield, D. Campana, M.A. Carloni, K. Carnie-Bronca, E.G. Chattopadhyay, S. Chau, N. Chen, C. Chen, Z. Chirkin, D. Choi, S. Clark, B.A. Classen, L. Coleman, A. Collin, G.H. Connolly, A. Conrad, J.M. Coppin, P. Correa, P. Cowen, D.F. Dave, P. De Clercq, C. DeLaunay, J.J. Delgado, D. Deng, S. Deoskar, K. Desai, A. Desiati, P. de vries, K.D. de Wasseige, G. DeYoung, T. Diaz, A. Díaz-vélez, J.C. Dittmer, M. Domi, A. Dujmovic, H. Duvernois, M.A. Ehrhardt, T. Eller, P. Ellinger, E. El Mentawi, S. Elsässer, D. Engel, R. Erpenbeck, H. Evans, J. Evenson, P.A. Fan, K.L. Fang, K. Farrag, K. Fazely, A.R. Fedynitch, A. Feigl, N. Fiedlschuster, S. Finley, C. Fischer, L. Fox, D. Franckowiak, A. Fritz, A. Fürst, P. Gallagher, J. Ganster, E. Garcia, A. Gerhardt, L. Ghadimi, A. Glaser, C. Glauch, T. Glüsenkamp, T. Goehlke, N. Gonzalez, J.G. Goswami, S. Grant, D. Gray, S.J. Gries, O. Griffin, S. Griswold, S. Groth, K.M. Günther, C. Gutjahr, P. Haack, C. Hallgren, A. Halliday, R. Halve, L. Halzen, F. Hamdaoui, H. Ha Minh, M. Hanson, K. Hardin, J. Harnisch, A.A. Hatch, P. Haungs, A. Helbing, K. Hellrung, J. Henningsen, F. Heuermann, L. Heyer, N. Hickford, S. Hidvegi, A. Hill, C. Hill, G.C. Hoffman, K.D. Hori, S. Hoshina, K. Hou, W. Huber, T. Hultqvist, K. Hünnefeld, M. Hussain, R. Hymon, K. In, S. Ishihara, A. Jacquart, M. Janik, O. Jansson, M. Japaridze, G.S. Jeong, M. III. Physikalisches Institut RWTH Aachen University AachenD-52056 Germany Department of Physics University of Adelaide Adelaide5005 Australia Dept. of Physics and Astronomy University of Alaska Anchorage 3211 Providence Dr. AnchorageAK99508 United States Dept. of Physics University of Texas at Arlington 502 Yates St. Science Hall Rm 108 Box 19059 ArlingtonTX76019 United States CTSPS Clark-Atlanta University AtlantaGA30314 United States School of Physics Center for Relativistic Astrophysics Georgia Institute of Technology AtlantaGA30332 United States Dept. of Physics Southern University Baton RougeLA70813 United States Dept. of Physics University of California BerkeleyCA94720 United States Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Institut für Physik Humboldt-Universität zu Berlin BerlinD-12489 Germany Fakultät für Physik & Astronomie Ruhr-Universität Bochum BochumD-44780 Germany Université Libre de Bruxelles Science Faculty CP230 BrusselsB-1050 Belgium Dienst ELEM BrusselsB-1050 Belgium Department of Physics Laboratory for Particle Physics and Cosmology Harvard University CambridgeMA02138 United States Dept. of Physics Massachusetts Institute of Technology CambridgeMA02139 United States Dept. of Physics The International Center for Hadron Astrophysics Chiba University Chiba263-8522 Japan Department of Physics Loyola University Chicago ChicagoIL60660 United States Dept. of Physics and Astronomy University of Canterbury Private Bag 4800 Christchurch New Zealand Dept. of Physics University of Maryland College ParkMD20742 United States Dept. of Astronomy Ohio State University ColumbusOH43210 United States Dept. of Physics Center for Cosmology and Astro-Particle Physics Ohio State University ColumbusOH43210 United States Niels Bohr Institute University of Copenhagen CopenhagenDK-2100 Denmark Dept. of Physics TU Dortmund University DortmundD-44221 Germany Dept. of Physics and Astro

The D-Egg, a dual PMT optical sensor, is one of the new optical modules designed for the coming IceCube Upgrade at the South Pole. With two 8-inch high-quantum efficiency photomultiplier tubes (PMTs) per module and improvements in overall design, D-Eggs offer an increased effective photodetection sensitivity that is 2.8 times larger than that of the current IceCube optical sensors. Mass production of over 300 D-Eggs has been completed, with all modules now undergoing Final Acceptance Testing (FAT) before deployment in the Antarctic ice. This involves detailed characterisation of each module at cold temperatures to collect valuable calibration data, as well as detect possible hardware related failures. While FAT is still on-going, current results indicate we will exceed the required 277 modules for deployment. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Acceptance tests

来源：评论

学校读者我要写书评

暂无评论

Analysis and design of STI-bounded Single Photon Avalanche Diode with Low Breakdown voltage

Analysis and Design of STI-bounded Single Photon Avalanche D...

引用

Electronic Information Technology and Smart Agriculture (ICEITSA), International conference on

作者： Jianxiu Hao Jianqun Ding Yungui Deng Xianwu Mi Qingxia Wang Zhengfeng Li Key Laboratory of Intelligent Control Technology for Wuling-Mountain Ecological Agriculture in Hunan Province School of Electrical and Information Engineering Huaihua University Huaihua China The Academic Affairs Office Huaihua University Huaihua China The Center for Practical Teaching Huaihua University Huaihua China

ISBN: (纸本)9781665413015

Single photon avalanche diodes (SPADs) which are based on impact ionization effect have been widely applied to detect the ultra-weak optical signals. Conventional SPAD devices have a high breakdown voltage due to the undeveloped manufacturing processes, which causes a high power dissipation. This paper proposes a structure of single photon avalanche diode with shallow trench isolation (STI) based on MXIC 0.18 µm complementary metal oxide semiconductor (CMOS) process. A series of simulations performed by Silvaco-Technology Computer Aided design (TCAD) were done to verify the fundamental working principle about SPAD. The two-dimensional simulation results include the volt-ampere characteristics, darkcurrent, electric field distribution, current path, impact ionization distribution and spectral response curve of the SPAD device. And the simulation results demonstrate that the proposed structure has a low breakdown voltage (11.5 v). The response peak wavelength is 500 nm, which can be applied to detecting the visible light.

关键词： Performance evaluation Semiconductor device modeling Simulation Impact ionization Semiconductor process modeling Semiconductor diodes Power dissipation

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：