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1st IEEE International Conference on Smart and Sustainable developments in Electrical engineering, SSDEE 2025

作者： Rathod, Urvashiben Pawar, Darsh v. Chauhan, Siddharthsingh K. Parida, Abhisek Tekwani, P.N. Institute of Technology Nirma University Dept. of Electrical Engineering Ahmedabad382481 India

ISBN: (纸本)9798331542108

This paper compares single-stage and dual-stage Improved Linear Sinusoidal Tracer (ILST) based three-phase grid-tied photovoltaic (Pv) systems. These systems facilitate the integration of solar energy into grid while improving the power quality of the distribution network. This design incorporates Maximum Power Point Tracking (MPPT), Pv power injection into the grid, harmonic reduction at the Point of Common Coupling (PCC), and grid current balancing. Both single-stage and dual-stage configurations utilize a three-phase voltage source converter (vSC) controlled by an ILST algorithm. The single-stage and dual-stage systems are modeled and simulated using MATLAB. This ILST control algorithm of grid-tied Pv system helps to maintain Total Harmonic Distortion (THD) of PCC voltages and grid currents within prescribed limits. © 2025 IEEE.

关键词： MATLAB

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Red, green, and blue edge-emitting devices for beam scanning light engine architectures: from single emitters to arrays 5

Red, green, and blue edge-emitting devices for beam scanning...

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optical Architectures for Displays and Sensing in Augmented, virtual, and Mixed Reality (AR, vR, MR) v 2024

作者： Rossetti, M. Castiglia, A. Malinverni, M. Ferhatovic, A. Martin, D. Duelk, M. vélez, C. EXALOS AG Wagistrasse 21 Schlieren8952 Switzerland

ISBN: (纸本)9781510670860

Laser beam scanners are of strong interest, as they offer a compact and low-power consumption solution for head-worn AR-displays and, more in general, for efficient and focus-free projection displays. In this framework, EXALOS has been leading the research and development of active light sources, focusing on optimizing red, green, and blue edge-emitting devices, including superluminescent diodes (SLEDs) and laser diodes (LDs). This work provides an overview of the performance achieved by single-emitter SLEDs and low-threshold LDs based on GaN, as well as AlGaInP, III-v semiconductors. Furthermore, we report on the development of emitter arrays. In particular, narrow-pitch devices with an emitter-to-emitter spacing of 10 ìm and also a novel device design featuring both anodes and cathodes on the top chip surface are reported. The individual cathodes are fully independent and electrically insulated, ensuring an emitter-toemitter resistance close to 1MOhm. Compared to conventional arrays with common cathode, the new architecture allows for integration with industry-standard current-sink drivers for efficient multi-LD modulation. © 2024 SPIE.

关键词： Semiconductor lasers

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Semiconducting SWCNT Photo Detector for High Speed Switching Through Single Halo Doping

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Computer Systems Science & engineering 2023年第8期46卷 1617-1630页

作者： A.Arulmary v.Rajamani T.Kavitha Department of Information and Communication Engineering Anna UniversityChennai600025TamilnaduIndia Department of Electronics and Communication Engineering VeltechMultitech Dr.RR Dr.SR Engineering CollegeChennai-42TamilnaduIndia

The method opted for accuracy,and no existing studies are based on this method.A design and characteristic survey of a new small band gap semiconducting Single Wall Carbon Nano Tube(SWCNT)Field Effect Transistor as a photodetector is carried *** the proposed device,better performance is achieved by increasing the diameter and introducing a new single halo(SH)doping in the channel length of the CNTFET *** paper is a study and analysis of the performance of a Carbon Nano Tube Field Effect Transistor(CNTFET)as a photodetector using the self-consistent Poisson and Green function *** 2D self-consistent Poisson and Green’s function method for various optical intensities and wavelength simulate this proposed *** performance study is based on the simulation of drain current,transconductance,sub-threshold swing,cut-off frequency,gain,directivity,and quantum efficiency under dark and illuminated *** quantum simulation results show that cut-off frequency increases while there is an increase in *** proposed SH-CNTFET provides better performance in terms of higher gain and directivity than conventional CNTFET(C-CNTFET).This device will be helpful in optoelectronic integrated circuits(OEIC)receivers due to its superior performance.

关键词： Single halo CNTFET self-consistent poisson equation green’s function photodetector

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Analysis and optimization of field curvature and pupil swim for near-eye display systems

Analysis and optimization of field curvature and pupil swim ...

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2024 Applied Optics and Photonics China: optical design and Manufacturing, AOPC 2024

作者： Wang, Da Cheng, Dewen Yao, Cheng Wang, Qiwei Beijing Engineering Research Center of Mixed Reality and Advanced Display School of Optics and Photonics Beijing Institute of Technology Beijing100081 China Beijing Ned+AR Ltd Beijing100081 China

ISBN: (数字)9781510687844

ISBN: (纸本)9781510687837

To achieve better immersive effects and a comfortable wearing experience, current near-eye display systems are designed with large fields of view and large exit pupils as goals. However, optical aberrations such as field curvature and pupil swim are inevitable in these systems. There is currently a lack of comprehensive analysis methods and optimization techniques for field curvature and pupil swim in these systems. This paper employs forward ray tracing and simulates the human eye using ideal lenses to converge light onto the image plane. By calculating the positions of minimum spot size for different fields of view, the location of the virtual image plane is determined, and a three-dimensional model of the virtual image plane for the system is constructed. Through an iterative approach, it controls the positions of virtual image points for different fields of view to optimize the system's field curvature. Additionally, pupil swim causes image fluctuations when the eye moves, significantly affecting visual experience. This paper proposes a quantification method for pupil swim and analyzes its correlation with field curvature. Finally, by designing different near-eye display systems, the effectiveness of the analysis methods is demonstrated. © 2024 SPIE.

关键词： Eye movements

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Recent developments in layered double hydroxide structures with their role in promoting photocatalytic hydrogen production: A comprehensive review

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INTERNATIONAL JOURNAL OF ENERGY RESEARCH 2022年第3期46卷 2093-2140页

作者： Sherryna, Areen Tahir, Muhammad Univ Teknol Malaysia Dept Chem Engn Sch Chem & Energy Engn Johor Baharu 81310 Johor Malaysia UAE Univ Chem & Petr Engn Dept Al Ain U Arab Emirates

Layered double hydroxides (LDHs) have received scientific attractions due to their unique two-dimensional (2D) structure, band gap tunability, and compositional flexibility, leading to the facile incorporation of the metal species into their layered structure. The main objective of this review is to explore the current advancement of LDH-based photocatalysts for photocatalytic hydrogen production by focusing on the role of divalent and trivalent metal incorporations and their efficiency enhancement. Firstly, the mechanism of photocatalysis and its thermodynamics has been explicated to gain basic understanding and fundamentals. Secondly, a brief introduction to the overview of LDH photocatalysts with special attention to the effects of cationic incorporations on the optical properties and computational study towards the electronic density has been demonstrated. Besides, the thermal stability of LDH is briefly discussed, focusing on the effects of temperature towards the conversion into mixed-metal oxide (MMO). Next, the classification of LDH based on divalent and trivalent cationic elements and their role in the brucite layer of LDH are systematically discussed. Attention is given to the mechanistic properties of the extensively studied metals, such as Mg, Ni, Zn, Co, Cr, Fe, v and Al, with the efficiency enhancements through various engineering aspects are demonstrated. The overview summary on the efficient design of LDH is elucidated to provide a deep understanding for improving their photocatalytic properties. Lastly, the future perspectives and recommendations are discussed to provide new insight into the potential of LDH and render them a notable place in solar energy applications.

关键词： band engineering layered double hydroxide LDH heterojunction strategies metallic classification photocatalytic hydrogen production thermodynamics analysis

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Sustainable design Process Management in a vUCA-World - A Survey on Risk and Technical Change Management in Automotive Industry 34

Sustainable Design Process Management in a VUCA-World - A Su...

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34th CIRP design Conference, CIRP 2024

作者： Lechner, Jennifer Schlüter, Nadine Fahrner, Achim ZF Friedrichshafen AG Löwentaler Straße 20 Friedrichshafen88046 Germany University of Wuppertal Gaußstraße 20 Wuppertal42119 Germany

Being sustainable is one of today's greatest challenges in the design process for the automotive industry. Upcoming trends in market and technology, disruptive changes (i.e., autonomous driving) as well as vUCA-factors aggravate the demand for flexibility, resilience, and sustainability in a system development. Sustainability in engineering and product design also requires corresponding processes to establish a framework and moreover a guideline. This exploration represents results out of a survey as part of a wider research. The investigation is based on state-of-the-art literature resulting in an empirical study. Objective is the development of a sustainable process orientated method for risk and technical change management for system development projects in a vUCA-world. The considered aspects are complexity, (re-) action, quality, Generic Systems engineering, and vUCA. The involvement of a transdisciplinary system development team supports the creation of a powerful method: Combining experiences, different perspectives, as well as considering existing pain points and hints of optimisation potentials. In summary, this elaboration presents information on the current situation as well as applicability of defined aspects for a powerful method. Concluding, this publication provides information on the considering elements to design a sustainable process model for risk and technical change management, for system developments in automotive industry. © 2024 Elsevier B.v.. All rights reserved.

关键词： Automotive industry

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optical Relays for Imaging Scintillators 14

Optical Relays for Imaging Scintillators

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current developments in Lens design and optical engineering XXIv 2023

作者： Malone, Robert M. Baker, Stuart A. Frayer, Daniel K. Haines, Todd J. Joyce, Kevin T. Kaufman, Morris I. Manhart, Paul K. Walters, Katherine L. Zepeda-Alarcon, Eloisa Nevada National Security Site Transformational Diagnostic and Imaging 2900 East Rd. Los AlamosNM87544 United States Lawrence Livermore National Laboratory LivermoreCA94550 United States

ISBN: (纸本)9781510665460

Cygnus is a dual beam high-energy radiographic x-ray source. Ten years ago, three large zoom lenses were assembled to collect images from 200 mm x 200 mm square scintillators. The zoom capability allows zooming down to a 60 mm x 60 mm picture from the scintillator. current radiographic imaging needs now require larger 270 mm x 270 mm square scintillators and the capability to use both 92 mm x 92 mm and 62 mm x 62 mm CCD cameras, and a new lens design to meet these needs. This zoom lens incorporates 11 elements and is designed to be telecentric. It images a scintillator emitting light peaking at 435 nm, so special glass types are required for the lens elements. Much larger elliptical pellicles are needed to deflect the scintillator light out of the x-ray path into the lens. The optical axis of the imaging system must be colinear with the x-ray axis. Two scintillators are positioned in each of two Cygnus x-ray axes, for a total of four scintillators and four lens systems. An optional configuration will be shown, enabling two lens systems imaging opposite sides of a single scintillator, for a total of four lenses and two scintillators. Although this configuration has advantages, it suffers from crosstalk. Care must be taken to analyze the anti-reflection coatings applied to all the elements in the imaging chain, including the CCD array and its vacuum window. The evolution of our Cygnus radiographic systems over the last two decades will be discussed. © 2023 SPIE.

关键词： optical design

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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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Fully integrated on-chip rectennas for K-band applications using a novel tunnelling diode

Fully integrated on-chip rectennas for K-band applications u...

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Sensors and Communication Technologies in the 1 GHz to 10 THz Band 2024

作者： Walsh, Christopher Sadeghi, Mohammadreza Missous, M. Department of Electrical and Electronic Engineering University of Manchester ManchesterM13 9PL United Kingdom Advanced Hall Sensors Ltd. ManchesterM17 1RW United Kingdom

ISBN: (数字)9781510681156

ISBN: (纸本)9781510681149

Recent developments in the design of the epitaxial structure of an asymmetrical spacer layer tunnel (ASPAT) diode have included a quantum well next to the barrier. This leads to a substantially improved curvature coefficient due to a reduction in the leakage current, introducing yet further advantages over the standard ASPAT diode, which has temperature independence, zero bias operations, and a high dynamic range. This work has developed these diodes into a fully integrated miniature rectenna solution, which integrates an antenna, rectifier, and RC filter. This device targets an operating frequency of 26 GHz, where such a solution could see applications in wireless power transfer, energy harvesting, or signal detection. The current design uses a loop antenna, where the trace has been meandered to increase the electrical length whilst enabling the die size of the device to be reduced to 2x0.8 mm2. This size, whilst at mm-scale, enables an efficient antenna to be designed with a simulated gain of 2 dBi. Integrated into this design is a general voltage doubler circuit, consisting of a series capacitor, a shunt diode, and a series diode, with this circuit followed by an RC filter, a shunt capacitor and a resistor, integrated on-chip. The design includes bond pads allowing the device to be packaged in standard QFN packages or onto PCBs for testing. Measurements confirmed that these devices can detect a K-band signal, with a peak reading of 55.2 mv detected at 23.5 GHz. © 2024 SPIE.

关键词： Semiconductor quantum wells

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A low-ripple fast boosting CMOS charge pump design 3

A low-ripple fast boosting CMOS charge pump design

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3rd International Conference on Electronic Information engineering, Big Data, and Computer Technology, EIBDCT 2024

作者： Cheng, Mengzhang Deng, Lili The High Educ. Key Laboratory for Flexible Manufacturing Equipment Integration of Fujian Province Xiamen Institute of Technology Fujian Xiamen361021 China

ISBN: (纸本)9781510680449

A low ripple fast boost CMOS charge pump is designed for charging mobile phones. The charge pump has the advantages of low power consumption, low cost, and simple circuit. In the design of the charge pump, in order to improve its boosting speed, voltage boosting circuits for pre-charging the charging node and substrate automatic following circuits to overcome the substrate effect of field-effect transistors are designed separately;And the simple common drain amplifier is used to reduce the charge pump's output ripple effectively. Based on CSMC 0.5 μm process and Dickson charge pump, a clock generation circuit, a charge pump circuit, a voltage regulation circuit, a pre-charging circuit, a substrate effect elimination circuit, and a common drain amplifier are designed. The charge pump circuits are designed and simulated by cadence. The simulation results show that the static current of the circuit is a few μA, the input voltage range is from 1v to 3v, and the output voltage is 4v. And the boosting time is below 100 μs, the ripple is less than 1mv, and when the input voltage is 1v, the static power consumption is only 0.3mW. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Timing circuits

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