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检索条件"任意字段=Conference on Current Developments in Optical Design and Engineering V"

共 1195 条记录，以下是61-70 订阅

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Methodology to design mobile-based camera lenses using freeform surfaces 22

Methodology to design mobile-based camera lenses using freef...

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conference on current developments in Lens design and optical engineering XXII

作者： Zhuang, Zhenfeng Dallaire, Xavier Parent, Jocelyn Roulet, Patrice Thibault, Simon Immervision Inc 2020 Robert Bourassa BlvdSuite 2320 Montreal PQ H2A 2A5 Canada Univ Laval Ctr Opt Photon & Laser Dept Phys Genie Phys & Opt 2375 Rue Terrasse Quebec City PQ G1V 0A6 Canada

ISBN: (数字)9781510644670

ISBN: (纸本)9781510644670

Freeform technology is one of the most promising solutions for enhancing the capability of aberration correction and improving performance of optical systems. Aiming to demonstrate the freedom and flexibility of optical system design, several challenging design examples using freeform surface are presented, including two wide-angle camera lenses adopting even and odd pedal polynomial formulations for symmetric optical surface description, and an anamorphic cinema lens employing non-rotationally symmetric surfaces for capturing a wider aspect ratio and offering a 1.33 x squeeze factor on a 4:3 sensor size. Methods and constraints for designing and optimizing the optical systems are discussed. The optical performances of these design examples are analyzed and the results verify the practicability and effectiveness of the proposed formulations and design strategies in the field of freeform imaging optical design.

关键词： Lens system design optical systems geometric optical design aspherics

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A Review on Application of Soft Computing Techniques in Geotechnical engineering 5th

A Review on Application of Soft Computing Techniques in Geot...

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5th International conference on Advances in Civil and Ecological engineering Research, ACEER 2023

作者： Nagaraju, T.v. Sireesha, Mantena Sunil, B.M. Alisha, Shaik Subhan Department of Civil Engineering S.R.K.R. Engineering College Bhimavaram India Department of Geo-Engineering Andhra University Visakhapatnam India Department of Civil Engineering National Institute of Technology Karnataka India Department of Civil Engineering Vishnu Institute of Technology Bhimavaram India

ISBN: (纸本)9789819957156

Numerous test results, mathematical relationships, and in-the-moment analysis and design are all components of geotechnical issues. Additionally, due to smart infrastructure and materials, the research trend in engineering nowadays is shifting toward intelligent tools and their ability to tackle engineering problems. Artificial neural networks (ANN), support vector machines (SvM), genetic algorithms (GA), and particle swarm optimization algorithms (PSO), among other soft computing techniques, have made significant progress in recent years in solving geotechnical issues. Based on a review of more than 800 published research, this study discusses the applicability of soft computing techniques in the current environment. Traditional methods, such as regression analysis and trial-and-error techniques, take time and could be more effective. Additionally, most geotechnical designs require considerable experimental data and may require laborious work. A novel methodology for soft computing approaches has emerged to solve the problems mentioned above. This paper presents soil problems and geotechnical challenges while examining recent developments and the potential applications of soft computing. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Soft computing

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Imager performance assessment with TRM4: recent developments 34

Imager performance assessment with TRM4: recent developments

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conference on Infrared Imaging Systems - design, Analysis, Modeling, and Testing XXXIv

作者： Perez, Jose Steiner, Dov Assaban, Dan An, Margarita Kessler, Stefan Fraunhofer IOSB Fraunhofer Inst Optron Syst Technol & Image Explo Ettlingen Germany IARD Sensing Solut Ltd IL-30065 Kibbutz Yagur Israel Israel Minist Def Tel Aviv Israel

ISBN: (纸本)9781510661806;9781510661813

Model-based performance assessment is an important tool in the design of electro-optical and infrared imagers and their performance comparison. It alleviates the need for expensive field measurements and can be used for parameter trade studies. TRM4 serves this purpose and features a validated approach to consider aliasing in the range performance assessment of focal plane arrays. TRM4.v3 was released in October 2021 and came with a set of new model features. One of the new capabilities is the performance assessment of imagers used for aerial imaging by computing the National Imagery Interpretability Rating Scale (NIIRS) as performance measure. The NIIRS values are calculated in TRM4 using the latest version of the General Image Quality Equation. In this paper, the result of a recent validation effort for the NIIRS calculation is reported. current TRM4 development focusses on performance modeling of subpixel target scenarios and color cameras. For subpixel targets, the calculation of the signal-to-noise ratio (SNR) for the additional target signal is presented considering different target locations with respect to the detector matrix. Best-case and worst-case detection ranges are derived from specified threshold SNRs of detection algorithms. First results are shown using the TRM4.v3 sky background scenario feature to model ground-to-air imaging of flying targets. A first step for modeling color cameras is the extension of AMOP (Average Modulation at Optimum Phase) calculation, which is used in TRM4 to describe the spatial signal transfer characteristics along the imaging chain. It is shown how the sampling by sensors with Bayer filter and demosaicing can be included into the AMOP calculation procedure.

关键词： electro-optical system performance range performance model performance assessment color camera subpixel targets NIIRS

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design of fault line selection for small current grounding system in distribution network 5

Design of fault line selection for small current grounding s...

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2023 5th International conference on Information Science, Electrical, and Automation engineering, ISEAE 2023

作者： Liu, Xin Yu, Tianjiao Wang, Zeyi Jiao, Mingxi Wang, Daliang Pei, Wenyang Deng, Weiying State Grid Changchun Power Supply Company China State Grid Jilin Electric Power Co. Ltd. China

ISBN: (纸本)9781510667440

With the increase of the coverage area of the domestic distribution network, the probability of failure of the distribution network system is also greatly increased. In this paper, a grounding fault line selection system is designed for the small current grounding system of the distribution network. Firstly, taking the fault recorder as the data source, a single-phase grounding fault line selection system is built to monitor the single-phase grounding fault of the small current grounding system in the distribution network of each substation and select the fault line accurately and quickly. Finally, a 380 v physical simulation platform is built to simulate the fault line selection test. Taking Changchun area as an example, a single-phase ground fault occurs in the 66 kv system of Jingyang substation. Through the analysis of the system, the feasibility and accuracy of the line selection system are verified. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Probability distributions

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Growth and fabrication of GaAs-based InAs/AlSb resonant tunneling diode 19

Growth and fabrication of GaAs-based InAs/AlSb resonant tunn...

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19th National conference on Laser Technology and Optoelectronics

作者： Pang, Qiuyao Wu, Donghai Xu, Jianxing Su, Xiangbin Xu, Yingqiang Wang, Guowei Ni, Haiqiao Niu, Zhichuan Key Laboratory of Optoelectronic Materials and Devices Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China College of Electronic Information and Communication Engineering University of Chinese Academy of Sciences Beijing100049 China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beijing100049 China Microsystem and Terahertz Research Center China Academy of Engineering Physics Sichuan Chengdu610200 China

ISBN: (纸本)9781510683228

With optimized buffer design, we demonstrate a new InAs/AlSb resonant tunneling diode (RTD) on lattice-unmatched semi-insulating (SI) GaAs (100) substrates aiming for terahertz oscillators. To obtain high crystal quality and smooth surface, 5 periods InGaAs/GaAs (2 ML/2 ML) superlattices (SLs) buffer layer was used as dislocation filters (DFs). X-ray diffraction (XRD) measurement showed the full width at half maximum (FWHM) of 331 arcsec and surface roughness of 2.4 nm over 10 μm×10 μm. 8-μm-diam diodes were fabricated by standard mesa process. I-v characteristic of the diodes shows negative conductivity at room temperature and a peak current density of 1.79×105 A • cm-2 was achieved. © 2024 SPIE.

关键词： Resonant tunneling diodes

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Research on high efficiency low voltage and high current spaceborne secondary power supply 9

Research on high efficiency low voltage and high current spa...

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9th International conference on Energy System, Electricity, and Power, ESEP 2024

作者： Ji, Mingming Zhao, Chuang Li, Huiyao Huang, Zhiqi Tang, Qi An, Qi Wang, Jianping Yin, Xiuting Beijing Spacecrafts Manufacturing Factory Beijing 100094 China Beijing Space Power Conversion and Control Engineering Technology Research Center Beijing 100094 China

ISBN: (纸本)9781510691728

As the integration of phased array antennas in spaceborne radar increases and the number of channels grows, the demand for power from spaceborne secondary power supplies is also escalating. The future development trend is towards low-voltage output, high current, high efficiency, and lightweight spaceborne secondary power supplies. This article conducts research on the selection of main power circuit topology, analysis of working modes, circuit simulation, and experimental verification. A 5v/40A power supply prototype was developed utilizing a full-wave synchronous rectification full-bridge circuit. The power supply operates within a voltage range of 80v to 120v, achieving a measured half-load efficiency of 93.6% and a full-load efficiency of 92.6%. It operates stably, exhibits good dynamic characteristics, and meets all design requirements. With high reliability, it is suitable for applications involving high-efficiency, low-voltage, and high-current secondary power supplies on board satellites. © 2025 SPIE.

关键词： full-bridge circuit high-efficiency Low voltage high current Satellite secondary power supply Synchronous rectification

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design of Low-Power High-Gain Transimpedance Amplifier 5

Design of Low-Power High-Gain Transimpedance Amplifier

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5th International conference on Smart Systems and Inventive Technology, ICSSIT 2023

作者： Kumar, Ravi Ranjan Sharma, Supriya Sharma, Kulbhushan Sharma, Avinash Vlsi Centre of Excellence Chitkara University Institute of Engineering and Technology Chitkara University Punjab India Dept. of Cse Mm Engg. College Haryana Mullana India

ISBN: (纸本)9781665474672

High-gain and low-power operation is prime requirement of transimpedance amplifier(TIA) for low current sensing applications. However, achieving high gain of TIA is crucial task using CMOS devices owing to limitation of noisepower budget. This research study has proposed an integrator-differentiator based TIA targeted for nano-pore current sensing which is implemented in 0.18 μm technology. The proposed circuit emulates a gain of 184.17 dBΩ, input referred current noise of5.79 nA, bandwidth of10.18 kHz and power dissipation of S7.30 μW at ± 0.9 v. The proposed TIA can also be used in various other applications like spectroscopy, electrophysiology and optical fiber communication. © 2023 IEEE.

关键词： Operational amplifiers

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Integrated green-grey-blue system: a bibliometric analysis-based review 5

Integrated green-grey-blue system: a bibliometric analysis-b...

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5th International conference on Green Energy, Environment, and Sustainable Development, GEESD 2024

作者： Jia, Ruilan Fu, Chun Gan, Yuqun School of Infrastructure Engineering Nanchang University Jiangxi Nanchang330038 China Design and Research Institute of Nanchang University Jiangxi Nanchang330038 China School of Public Policy and Management Nanchang University Jiangxi Nanchang330038 China Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Education Nanchang University Jiangxi Nanchang330038 China School of Civil Engineering and Architecture East China Jiaotong University Jiangxi Nanchang330100 China

ISBN: (纸本)9781510683006

The Integrated Green-Grey-Blue System (IGGBS) represents an advanced strategy for sustainable stormwater management, critically enhancing water resource efficiency and urban resilience. This study utilizes the Web of Science Core Database, R language’s Bibliometrix tool, and CiteSpace software to comprehensively review the research developments in IGGBS. The objective is to integrate international experiences and address current challenges and future directions. The findings indicate: (1) International research on IGGBS has shown consistent growth, with notable increases in China from 2020 to 2023, underscoring its significance in the development of sponge cities;(2) The majority of the studies are published in Q1 category journals of the Journal Citation Reports, predominantly authored by scholars from developed nations such as the USA, UK, and Germany, with fewer contributions from Chinese researchers;(3) IGGBS research is intricately linked with ecosystem services, climate change, urbanization, and resilience theory, trending towards more precise indicators and diverse objectives. Furthermore, the study highlights a gap between theoretical research and practical implementation, pointing to a lack of comprehensive exploration of coupling relationships and future uncertainties. It suggests the necessity to enhance evaluation systems, and foster interdisciplinary collaboration and public engagement, closely aligned with policy, to facilitate the broader adoption and management of IGGBS. © 2024 SPIE.

关键词： Climate change

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Effect of a Novel Flow Field design on PEM Fuel Cell Performance 16

Effect of a Novel Flow Field Design on PEM Fuel Cell Perform...

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16th International conference on developments in eSystems engineering, DeSE 2023

作者： Bunyan, Sadiq T. Dhahad, Hayder A. Khudhur, Dhamyaa S. Yusaf, Talal Mustansiriyah University Mechanical Engineering Department Baghdad Iraq University of Technology Engineering Department Baghdad Iraq Central Queensland University School of Engineering and Technologies QLD Australia

ISBN: (纸本)9798350381344

the promising potential of Proton Exchange Membrane Fuel Cells (PEMFCs) for emission-free energy generation has been hindered by notable challenges, including water management, reactant distribution, and mass transport limitations. The flow field, a vital component, aims to efficiently deliver necessary reactants, thereby overcoming these difficulties and improving PEMFC performance. This study delves into the profound influence of a pioneering flow field configuration on PEMFC performance. Three novel designs, namely, FFF1, FFF2, and FFF3, all inspired by the Fibonacci sequence, were examined and contrasted with the baseline serpentine flow field. Results highlight that these innovative Fibonacci-oriented designs have a substantial impact on cell performance at voltages under 0.645 v, while maintaining a minor effect at voltages above this threshold. Remarkably, the application of these configurations significantly bolstered the ohmic polarization region. The novel configurations yielded pronounced improvements in peak power density. Upgrades were observed in FFF1, FFF2, and FFF3 at 28.04%, 4.82%, and 20.3%, respectively. Furthermore, these Fibonacci-inspired designs commenced concentration losses at superior current densities (1.05, 1, and 1.01 A/cm2 for FFF1, FFF2, and FFF3, respectively) compared to the standard 0.97 A/cm2 observed for the serpentine flow field. Among the new designs, the initial Fibonacci-based configuration (FFF1) outperformed the others, positioning itself as the optimal design. This research sets a new benchmark for future PEMFC development and optimization. © 2023 IEEE.

关键词： Flow fields

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Assessing energy technologies sustainability: upscaling photovoltaics using absolute LCA 30

Assessing energy technologies sustainability: upscaling phot...

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30th CIRP Life Cycle engineering conference, LCE 2023

作者： Riondet, L. Rio, M. Perrot-Bernardet, v. Zwolinski, P. Univ. Grenoble Alpes CNRS Grenoble INP G-SCOP Grenoble38000 France I2M Bordeaux UMR 5295 Institut de Chambéry Le Bourget du Lac73370 France

The upscaling of a technology has different facets that should be considered with anticipatory environmental assessment to deem its sustainability before industrialization. The Life Cycle Assessment (LCA) methodology is widely used to assess a product sustainability based on technologies. LCA is however usually applied after technology deployment, as a comparative approach validating the efficiency of the previous technology usage. Anticipatory LCA developments are therefore needed to help designers and engineers to investigate the sustainability of future technology implementations. This article paves the way to enhance ex-ante (or prospective) studies with an absolute sustainability framework, thus demonstrating the incompleteness of current developments on the upscaling from the designer's perspective. This is achieved through a case study applied on two photovoltaic technologies, silicon mono-crystalline and silicon/perovskite tandem in France, and in the current and the 2050 perspectives. Results show that assigning absolute sustainability targets at the technology level provides a new design framework, resulting in a go/no-go strategy. The minimal environmental performance requirements associated to technology deployment conditions through scenarios are identified. During this process, however, questioning the temporal and spatial scope of the study remains crucial to design a sustainable technology and the corresponding service it provides. © 2023 The Authors. Published by Elsevier B.v. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0)

关键词： Life cycle

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