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59th International Universities Power engineering Conference, UPEC 2024

作者： Alimi, Sulaimon O Al-Greer, Maher Pinedo-Cuenca, Ruben Warnakulasuriya, Kapila Dhanapala, vijira Gurwicz, David School of Computing Engineering and Digital Technologies Teesside University Middlesbrough United Kingdom Buckingham Magnetics Ltd Victoria Building Middlesbrough United Kingdom

ISBN: (纸本)9798350379730

The growing demand for high-voltage direct current (HvDC) power supplies in the field of remotely operated vehicles (ROvs) has experienced a significant rise due to developments in underwater exploration and intervention technologies. This study provides an in-depth analysis of the design and assessment of a HvDC power supply system for ROvs. The main goal is to attain a substantial direct current (DC) voltage output of 5000 v, which is crucial for supplying power to ROv activities in deep-sea environments. To achieve this objective, a sophisticated configuration of a 24-pulse rectifier is presented and thoroughly examined. The design process entails a detailed evaluation of component selection and circuit topology to guarantee optimal efficiency and reliability. The 24-pulse rectifier is specifically focused on the benefits it provides, especially in terms of minimising harmonics and enhancing power quality. These factors are crucial for underwater applications, where ensuring a reliable and efficient power supply is of utmost importance. The suggested HvDC power supply is subjected to comprehensive evaluation through simulation studies. The success of the design technique is validated by thoroughly assessing performance parameters like voltage regulation, efficiency, harmonic distortion, and ripple factor. The proposed system demonstrated approximately 99.99% efficiency, with a total harmonic distortion (THD) of 0.045 and voltage and current ripple values of 0.0646% and 10.3911%, respectively. © 2024 IEEE.

关键词： Harmonic distortion

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Understanding Healthcare design Transformations. Insights from the Swedish Experience

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Studies in Health Technology and Informatics 2024年 319卷 237-249页

作者： Sacchetti, Laura Lindahl, Göran Department of Architecture University of Ferrara Italy Chalmers University of Technology Department of Architecture and Civil Engineering Centre for Healthcare Architecture Sweden

ISBN: (纸本)9781643685496

In Europe, most countries are facing common healthcare challenges that lead to a need for innovation, effectiveness and efficiency in the healthcare systems. This is often addressed through actions and intentions including enhanced primary and integrated care. However, these developments seem to be progressing slowly and non-uniformly, nor is there knowledge exchange, and the full implications of these changes on healthcare design are still unfolding. The research presented investigates what are the current trends in healthcare systems and the effects on design transformations, focusing on the Swedish experience. In Sweden, a reform known as "Nära vård" [Close Care], aims to "reconstruct" the core of the healthcare service around primary care. It strives to bring care "closer" to people and communities concerning access to both care and the facilities where it is delivered. The objective of this paper is to understand what can be learnt from the Swedish experience;the research presented aims at investigating the effects of the Close Care reform on primary care facilities design. The study was conducted from April to July 2023, and it consisted of: i) desk research and literature review;ii) data collection through 12 interviews with experts;iii) data analysis through qualitative content analysis;iv) study visits to local care facilities. From the interviews, 10 factors for change and 9 challenges emerged. Moreover, it appears that the organisational structure of the Swedish healthcare system caters for regional and individual projects’ interpretations of how to bring care "closer" to the patients;this variation allows for a broader understanding of the advantages and drawbacks of each organisational model and design, and it reinforces the idea that there is no "one-size-fits-all" for close care. This diversity points to a need for a project evaluation program of the ongoing experiences, aimed at assessing the performance and effectiveness of each approach. © 2024 The

关键词： Healthcare design community local healthcare facilities post-project evaluation primary care facilities

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Simultaneous Multiple Surfaces method applied to infrared lenses 23

Simultaneous Multiple Surfaces method applied to infrared le...

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Conference on current developments in Lens design and optical engineering XXIII Part of SPIE Optics and Photonics Conference

作者： Mayeur, T. volatier, J. B. Druart, G. Tartas, E. Durand, A. Cau, F. Off Natl Etud & Rech Aerosp 6 Chemin Vauve Granges F-91120 Palaiseau France Lynred 364 Route Valence F-38113 Veurey Voroize France Safran Elect & Def 100 Ave Paris F-91300 Massy France

ISBN: (纸本)9781510654198;9781510654181

In optical design, the designer's experience is critical. Indeed, an experienced optical designer will often choose a better starting point for optimization than an inexperienced one. Most of the time, lens design software use a local optimization algorithm, which is why the starting point is so important to get an excellent optical system. We present here an alternative to the classical optical design method and a solution to reduce the impact of the designer's experience. Our alternative couples the Simultaneous Multiple Surfaces (SMS) method, introduced by Benitez and Minano with optimization in Zemax OpticStudio. The SMS method is a direct construction method of optical systems without optical aberrations for as many field points as the system contains surfaces. This method can deal with both aspheric and freeform optical systems depending on the dimension of the method implemented. Our implementation of the SMS method can design optical systems with three surfaces. We use the SMS method to define a freeform system with an F-number of 0.85. Then, we use this fast freeform system as a starting point to perform further optimization in Zemax OpticStudio. Finally, we achieve to design two diffraction-limited freeform systems, one over a square field of view of +/- 30 degrees and another over a rectangular field of view of +/- 33 degrees x +/- 26 degrees.

关键词： Simultaneous Multiple Surfaces freeform surfaces Cartesian oval automated method optical design

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Recent developments on Electrically Pumped Organic Lasers (Invited)

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CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG 2025年第5期52卷 117-126,F0002页

作者： Hao, He Ye, Gaoda Li, Suheng Ding, Ran Feng, Jing Jilin Univ Coll Elect Sci & Engn State Key Lab Integrated Optoelect Changchun 130012 Jilin Peoples R China

Significance As one of the most important inventions in the 20th century, the laser has been widely termed "the fastest knife," "the most accurate ruler," and "the brightest light." A laser represents light amplification by the stimulated emission of radiation, which can explain the lasing generation process. Organic lasers, as important components of lasers, have received extensive attention in the field of optoelectronics for various applications owing to their advantages, such as facile fabrication, low cost, and ease of integration. Recently, organic lasers have been used extensively, and the design and synthesis of a series of promising organic-laser gain media have intensified. The development of optically pumped organic lasers has progressed significantly;however, the aim of electrically pumped organic lasers remains a worldwide research problem. Owing to the three key components of organic lasers, the fabrication of optical resonators is crucial to realize efficient and stable electrically pumped organic lasers. Progress Here, we summarize the recent novel developments of electrically pumped organic lasers, from material selection to device optimization. Three types of optical resonators are typically used in electrically pumped organic lasers: distributed feedback structures (DFBs), distributed Bragg reflectors (DBRs), and whispering gallery mode (WGM). To realize electrically pumped organic lasers, the following criteria must be satisfied: sufficient current injection and exciton densities to induce population inversion, clear threshold behavior of current-density-dependent spectral narrowing and output-power enhancement, and observation of both spatial and temporal coherence. Figure 1 shows the organic four-level system under electrical excitation and the lasing behavior of the output power and FWHM (full width at halt maxima) as a function of current density. In Section 2.1, we summarize the recent developments of electrically pumped organic lasers based

关键词： organic lasers Key words organic lasers electrically pumped lasers organic semiconductor materials organic light-emitting devices optical resonators

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design and simulation of AlGaAs Curved Mirror vertical Cavity Surface Emitting Laser 29

Design and simulation of AlGaAs Curved Mirror Vertical Cavit...

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vertical-Cavity Surface-Emitting Lasers XXIX 2025

作者： Nashed, A.I. Lestrade, Michel Li, Z.Q. Li, Z.M. Simon Crosslight Software Inc. 230-3410 Lougheed Hwy VancouverBCV5M 2A4 Canada

ISBN: (数字)9781510685178

ISBN: (纸本)9781510685161

This paper presents the design and simulation of an AlGaAs-based vertical Cavity Surface Emitting Laser (vCSEL) with a curved bottom Distributed Bragg Reflector (DBR), operating at 830 nm. The curved mirror enhances mode confinement, reducing threshold current to 0.8 mA and improving output power to 5mW at 5mA bias, outperforming flat mirror designs. Dynamic simulations under 1 GHz modulation confirm excellent high-speed performance. These results demonstrate the potential of curved mirror vCSELs for compact, efficient, and high-frequency optical applications. © 2025 SPIE.

关键词： Surface emitting lasers

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design of a low-temperature drift voltage reference based on parasitic capacitance startup 7

Design of a low-temperature drift voltage reference based on...

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7th International Conference on Advanced Electronic Materials, Computers, and Software engineering, AEMCSE 2024

作者： Zhou, Lu College of Wealth Management Ningbo University of Finance & Economics Zhejiang China

ISBN: (纸本)9781510681866

To enhance the performance of the PMU, a voltage reference based on a voltage bandgap has been proposed. During the power-on process, the startup circuit is activated due to parasitic capacitance coupling. After the power-on process is completed, the startup circuit self-turns off to reduce power consumption. Subsequently, a high-order compensation circuit is designed to generate a current with only constant and high-order temperature terms, compensating for the temperature coefficient of the voltage bandgap. An RC filter is then added to the output to improve the power supply rejection ratio in the high-frequency range. To further reduce the power consumption of the voltage bandgap, almost all MOS transistors are operated in the subthreshold region, achieving a decrease in static current consumption. Circuit design and simulation were completed based on the TSMC 0.18 μm CMOS process. The results indicated that at a supply voltage of 1.8 v, the bandgap output was 1.232 v;within the temperature range of -40 ℃ to 140 ℃, the temperature coefficient was 4.8×10-6 ℃-1;with the addition of the RC filter, the power supply rejection ratio at high frequency was -73 dB @ 10 MHz;furthermore, the static current of the entire bandgap was only 3.7 μA. © 2024 SPIE.

关键词： CMOS integrated circuits

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Applications of bio-derived/bio-inspired materials in the field of interfacial solar steam generation

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Nano Research 2022年第4期15卷 3122-3142页

作者： Yang Geng Kai Jiao Xu Liu Peijin Ying Omololu Odunmbaku Yaoxin Zhang Swee Ching Tan Ling Li Wei Zhang Meng Li MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems CQU-NUS Renewable Energy Materials&Devices Joint LaboratorySchool of Energy&Power EngineeringChongqing UniversityChongqing 400044China Key Laboratory of Thermo-Fluid Science and Engineering of MOE School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049China Department of Materials Science and Engineering CQU-NUS Renewable Energy Materials&Devices Joint LaboratoryNational University of SingaporeSingapore 117573Singapore Department of Mechanical Engineering Virginia Polytechnic Institute and State UniversityBlacksburgVA 24061USA Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714China

Interfacial solar steam generation(ISSG)system has attracted extensive attention as a sustainable desalination technology because of its cost efficiency and zero fossil-energy *** at optimizing the desalination properties,materials and system design have been the current research ***,many novel bio-derived/bio-inspired design strategies were proposed owing to their highly efficient structures inherited from nature,which were fine-tuned over eons of evolution,as well as their low cost and ease of *** this review,we are going to systematically report recent progress of various bio-derived/bio-inspired strategies in terms of optical design,wetting,thermal management,and overall system design,presenting an overview of the current challenges of bio-inspired materials in ISSG system and other application *** article is intended to provide a comprehensive review of recent developments about bio-derived/bio-inspired materials in ISSG system and conclude with suggestions regarding further research directions for performance enhancement through design of bio-derived/bio-inspired materials.

关键词： interfacial solar steam generation bio-derived materials bio-inspired materials solar-thermal conversion thermal management

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design of projection-based augmented reality system using holographic screen display 23

Design of projection-based augmented reality system using ho...

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Conference on current developments in Lens design and optical engineering XXIII Part of SPIE Optics and Photonics Conference

作者： Nishikawa, Jun Nakamura, Tomoharu Sony Grp Corp R&D Ctr Atsugi TEC 4-14-1 Asahi Cho Atsugi Kanagawa 2430014 Japan

ISBN: (纸本)9781510654198;9781510654181

Holographic display elements (HOEs) with a high diffraction efficiency and size enlargement have been developed since 2019. To achieve high brightness and low haze, unprecedented optical systems have been proposed with a uniform chief ray angle of 0 degrees in the x-section and 70 degrees in the y-section of the HOEs. A 360 degrees cylindrical holographic screen display (CHSD) was obtained by providing a large tilt to the surface shape near the optical axis. This was done using a first-order odd aspherical coefficient for the light flux from a refractive optical system (RO). A flat holographic screen display (FHSD) is a compact, high-performance display that uses three decentered and tilted freeform mirrors to route light flux from the RO in a ball-like form. Prototyping also proposes the possibility of an augmented reality system that takes advantage of the high transparency. The design for further miniaturization while maintaining optical performance was also discussed, in which the size of the first mirror was reduced by reducing the half-field angle of the RO to approximately 6 degrees. Furthermore, by increasing the negative power of the second mirror, the small size could be maintained The size of the last mirror was dependent on the screen size and could not be reduced. By laying down the posture of this mirror, we were able to halve the size reduction in the vertical direction. In this paper, lens designs for CHSDs and FHSDs are reported. The potential of this display is also discussed.

关键词： Holographic optical elements augmented reality display freeform mirror projection lens lens design

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Low-power off-chip capacitor-free LDO design with high transient response 2

Low-power off-chip capacitor-free LDO design with high trans...

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2nd International Conference on Electrical, Electronics, and Information engineering, EEIE 2023

作者： Wu, Haoran Yin, Jiayu Huang, Xindong Chen, Chengying Xiamen University of Technology No. 600 Polytechnic Road Houxi Town Jimei District Xiamen China

ISBN: (纸本)9781510672840

To reduce the area occupied by the low dropout regulator (LDO) in the whole chip system and to current consumption in standby state, this paper proposes a new structure using a diode-connected PMOS as a load resistor, which optimizes the area of the chip under the premise of guaranteeing the performance. The circuit is realized with UMC 28nm 1p9m process. The simulation results show that it can stably output a voltage of 1.197v under an input voltage of 2.5-3.6v, and its current operation range is 100μA-20mA with a transient response time of ≤0.5μs, a quiescent current of 9μA, and a phase margin of ≥77°. © 2024 SPIE.

关键词： Transient analysis

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Fault Detection of Distributed Power Distribution Network Based on Grey Wolf pack Algorithm

Fault Detection of Distributed Power Distribution Network Ba...

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2024 International Conference Optoelectronic Information and optical engineering, OIOE 2024

作者： Li, Yuqing Luo, Jinman Wang, Haiji Dongguan Power Supply Bureau Guangdong Power Grid Corporation Guangdong Dongguan China China Energy Construction Group Guangdong Electric Power Design and Research Institute Co. Ltd. Guangdong Guangzhou China

ISBN: (数字)9781510688209

ISBN: (纸本)9781510688193

The integration of distributed power supply into the distribution network is an important trend in the development of the current new power system. In view of the problem that the system can not quickly and accurately obtain the fault type and locate the location of the fault when the current distributed power distribution network fails. Introduce a detection method to optimize the current fault analysis system of distribution network based on the grey Wolf pack algorithm (Grey Wolf Optimization, GWO), and optimize the fault detection algorithm based on the optimization of distribution network structure. In addition, a complete analytical model of complete fault information such as medium calculation, misoperation and action is constructed to improve the analytical model of detecting complex fault situations in the distribution network. Through example analysis, the effectiveness of the fault detection model of distributed power distribution network based on gray Wolf swarm algorithm is verified, reducing the probability of fault miscalculation of distribution network to a certain extent, and solving the problem of low accuracy and slow speed of distribution network fault detection in the traditional algorithm. © 2025 SPIE.

关键词： Power distribution faults

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