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3rd International Conference on Optoelectronic Science and Materials, ICOSM 2021

作者： Han, Yu Peng, Yuan Zhang, Hongyan Beijing Key Laboratory of Clothing Materials R&D and Assessment Beijing Engineering Research Center of Textile Nanofiber Beijing Institute of Fashion Technology Beijing100029 China

ISBN: (数字)9781510649323

ISBN: (纸本)9781510649316

Carbon dots (Cds) not only inherit the advantages of good biocompatibility and abundant raw material sources, but also exhibit excellent optical properties. Cds possess important research significance and application prospects in materials science, biomedicine, and catalytic degradation. In this paper, Cds were prepared from dandelions mixed with boric acid, urea, and norfloxacin respectively. We investigated the effect on the degradation efficiency of methylene blue (MB) using boron, nitrogen, and fluorine for co-doping Cds under solar light. results show that nitrogen-doped Cds can improve photocatalytic degradation rate up to 55% which is higher than no doped Cds. That also is the best among boron-doped, fluorine-doped, and co-doping Cds with the two or three elements co-doping. © 2021 SPIE.

关键词： Boric acid

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radiated EMI Modeling of SMPS device with Cables Considering Wiring Features

Radiated EMI Modeling of SMPS Device with Cables Considering...

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Power Electronics and Application Symposium (PEAS), IEEE International

作者： Junpeng Ji dengcai Zhang Shan Lin Fengjiao Cheng Wenlong Gu Tuo Li School of Electrical Engineering Xi'an University of Technology Xi'an Shaanxi China R&D Department Shaanxi Cironchuang Electronic and Electrical Co.ltd. Xi'an Shaanxi China Quality and Technology R&D Center Guangzhou Metro Design & Reasearch Institute Co. LTD. Guangzhou Guangdong China

Switching-mode power supply (SMPS) connects the power supply and load through the long cables. radiated electromagnetic interference (EMI) becomes more serious because of the significant increase of switching frequency. It is necessary to analyze the generation mechanism of radiation EMI. Aiming at the problem that the wiring features of the cables are not taken into account in the radiation EMI model of the SMPS device and the accuracy of radiation EMI prediction needs to be improved. A radiation EMI emission model considering bending positions and angles of cables has been proposed, which can accurately predict the radiation EMI of SMPS. Finally, an experimental platform is built and the correctness of the proposed model is verified by experiments.

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Low-Noise and High-Power Spoke-Type Magnet-Assisted Flat-Plate IPMSM for Integrated Starter Generator Motor

Low-Noise and High-Power Spoke-Type Magnet-Assisted Flat-Pla...

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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Kodai Okazaki Yoshihiro Miyama Junji Kitao Tomohira Takahashi Kengo Kumagai Naoki Ohashi Naomichi Ota Fumitaka Totsuka Advanced Technology R&D Center Mitsubishi Electric Corporation Hyogo Japan Himeji Works Mitsubishi Electric Corporation Hyogo Japan Component Production Engineering Center Mitsubishi Electric Corporation Hyogo Japan

This study proposes a low-noise high-power motor for integrated starter generators (ISGs) and a stress reduction technique for a flat-plate interior permanent magnet synchronous motor (IPMSM) rotor structure, and applies a spoke-type permanent magnet-assisted structure that improves the generating power without increasing noise and vibration (NV). Our proposed spoke-type magnet-assisted flat-plate IPMSM technique with 10% current increasement improves the generating power by 26.5% and achieves 24.3 kW, suppressing increases in the NV level. In this study, we demonstrate a novel stress reduction concept and a low NV concept for a spoke-type permanent magnet-assisted flat-plate IPMSM. Measured results of the proposed motor show good agreement with the simulation results and demonstrate NV levels equivalent to a conventional motor.

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Torque and Power Improvement of Integrated Starter Generator Motor with radially Thin rotor Core

Torque and Power Improvement of Integrated Starter Generator...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Yoshihiro Miyama Naoki Ohashi Fumitaka Totsuka Naomichi Ota Kengo Kumagai Advanced Technology R&D Center Mitsubishi Electric Corporation Amagasaki Japan Himeji Works Mitsubishi Electric Corporation Himeji Japan Component Production Engineering Center Mitsubishi Electric Corporation Amagasaki Japan

A novel stress reduction technique using inter-pole slots is proposed for improving the torque and power of an integrated starter generator (ISG) motor with a radially thin rotor core. With a 10% coil-turn reduction and current increasement, the proposed ISG motor achieved a 5.7% torque enhancement and a 14.9% power increasement at the same size as a conventional ISG motor.

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Study on a novel liquid air energy storage system integrated with two-column air separation unit

Study on a novel liquid air energy storage system integrated...

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New Energy and Power engineering (ICNEPE), International Conference on

作者： Ningzhi Li Chaoyu Zhang Haochen Zhang Boxu Yu Zhangying Yu Zhongzheng Wang Peng Hu Jiangzhe Feng Equipment Technology Center Electrical Control Department National Energy Wind Power Operation Technology R&D Center Longyuan (Beijing) New Energy Engineering Technology Co.Ltd Beijing China Equipment Technology Center Electrical Control Department Longyuan (Beijing) New Energy Engineering Technology Co.Ltd Beijing China School of Energy Power and Mechanical Engineering North China Electric Power University Beijing China Longyuan(Beijing) New Energy Engineering Technology Co. Ltd Beijing China

ISBN: (数字)9798331516086

ISBN: (纸本)9798331516093

The liquid air energy storage (LAES) system offers advantages such as high energy density and strong flexibility and is often coupled with external energy sources or processes to enhance its applicability. This paper proposes a novel LAES system integrating with a two-column cryogenic air separation unit (ASU). during the charging phase, the gaseous products from the separation tank of LAES are used to supply the ASU with feedstock, while the stored liquid air provides cooling to the ASU. Additionally, external air is supplied to compensate for the shortage of oxygen in the feedstock. during the discharging phase, the ASU operates solely through the supplementary air supply, reducing the system's power consumption. This study analyzes the operational characteristics of the coupled LAES-ASU system and discusses the effect of liquid air supply of LAES to the ASU on the system performance.

关键词： Power engineering Liquids Power demand Cooling System performance Particle separators Steady-state Nitrogen Power generation Energy storage

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Experimental Study on Arcing in Thermal Propagation of Lithium-Ion Battery Systems

SSRN

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SSrN 2024年

作者： Li, Zhaoyang Liu, dinghong Li, Haibin dong, Wenkai Zhang, Hongzhu Tian, Yongjun Liu, Lei Co. Ltd. Changzhou213000 China China Automotive Technology and Research Center Co. Ltd. Tianjin300300 China Jiangsu Province Engineering Technology Research Center of Optical Storage Charging and Testing Integrated R&D and Application Changzhou213000 China

With the widespread integration of lithium-ion batteries in electric vehicles and energy storage systems, ensuring their safety remains a top priority. researchers have diligently studied the thermal runaway and propagation mechanisms of these batteries to enhance their safety features. despite significant progress in addressing thermal runaway and propagation, the sporadic occurrence of high-voltage arc phenomena remains a persistent concern, contributing to thermal propagation and potential fires within lithium-ion battery systems. To tackle this challenge, this study introduces a dedicated experimental setup employing a 280Ah lithium iron phosphate (LFP) battery as the samples to be studied. By replicating typical arcing processes at an experimental level, the investigation uncovers crucial insights. Specifically, it reveals that at about 316V, distances less than 4mm between positive and negative terminals can induce breakdown, resulting in arcing and severe combustion triggered by the gas and smoke released during thermal runaway from a single cell. Furthermore, the study proposes an experimental methodology to delve into arcing phenomena and effectively reconstructs the ignition process caused by arcing. Additionally, it suggests exploring the arcing boundary and researching methods for arcing suppression as vital avenues for further exploration. © 2024, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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Tight scaling of key rate for differential-phase-shift quantum key distribution

arXiv

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arXiv 2024年

作者： Mizutani, Akihiro Tsurumaru, Toyohiro Faculty of Engineering University of Toyama Gofuku 3190 Toyama930-8555 Japan Mitsubishi Electric Corporation Information Technology R&D Center 5-1-1 Ofuna Kamakura-shi Kanagawa247-8501 Japan

The performance of quantum key distribution (QKd) protocols is evaluated based on the ease of implementation and key generation rate. Among major protocols, the differential-phase-shift (dPS) protocol has the advantage of simple implementation using a train of coherent pulses and a passive detection unit. Unfortunately, however, its key rate is known to be at least proportional to η2 with respect to channel transmission η → 0. If one can only prove the rate proportional to η2 and cannot improve the analysis beyond that, then the dPS protocol will be deemed inferior to other major protocols, such as the decoy BB84 protocol. In this paper, we consider a type of dPS protocol in which the phase of each emitted block comprising n pulses is randomized and significantly improve the analysis of its key rate. Specifically, we reveal that the key rate is proportional to η1+ 1/n−2 and 1 this rate is tight. This implies that the dPS protocol can achieve a key rate proportional to η for a large number of n, which is the same scaling as the decoy BB84 protocol. Our result suggests that the dPS protocol can achieve a combination of both advantages of ease of implementation and a high key generation rate. Copyright © 2024, The Authors. All rights reserved.

关键词： Quantum cryptography

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Carbon-doped Copper Catalysts for Carbon dioxide Capture and Utilization Towards Methanol Production

SSRN

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SSrN 2024年

作者： Zhou, Guangping Yang, Bo Huang, Hao Zhou, Xuan Jiang, Huoyan Zhang, da Luo, Shaojuan Zhang, Wanli Xie, Shaoqu School of Light Industry and Chemical Engineering Guangdong University of Technology Guangzhou510006 China Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center Jieyang515200 China R&D Center Shanghai Shaanxi Coal Hi-tech Research Institute Shanghai201613 China

Carbon dioxide (CO2) hydrogenation to methanol (MeOH) is an effective strategy for the utilization of CO2 in recent years, aiming to mitigate greenhouse gas emissions. due to the deactivation of many copper-based catalysts caused by by-products generated during the reaction, the development of new copper-based catalysts is particularly crucial for the liquid-phase hydrogenation of amine-captured CO2 to produce methanol. This paper reports a copper-based catalyst doped with glucose, fructose, and sucrose as carbon sources. The performance of carbon-doped copper-based catalysts is superior to that of undoped ones, with the Cu/Al2O3-SUC catalyst exhibiting the best performance. Through characterization experiments, it was found that the 20 wt% copper-based catalyst, after carbon doping, exhibits highly dispersed copper on the mesoporous alumina support with very small particle sizes. The highly dispersed copper interacts strongly with a strong metal–support interaction (SMSI), enhancing the catalytic performance for CO2 hydrogenation to methanol. Additionally, the carbon-doped copper catalyst contains a higher concentration of hydroxyl groups, facilitating the conversion of formic acid to methyl formate and thereby promoting the conversion of methyl formate to methanol. Furthermore, the doped copper crystalline surface shows predominantly Cu (111). All these factors contribute to the synthesis of methanol. Catalytic performance tests indicate a peak methanol yield of around 12% with a selectivity of approximately 91%. © 2024, The Authors. All rights reserved.

关键词： Carbon dioxide

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recent Advances of Monolithic All-Perovskite Tandem Solar Cells:From Materials to devices

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Chinese Journal of Chemistry 2022年第7期40卷 856-871页

作者： Shan Jiang Yiming Bai Zongwen Ma Shengli Jin Chao Zou Zhao'ao Tan State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China Key Laboratory of Solar Energy Utilization&Energy Saving Technology of Zhejiang Province Zhejiang Energy Group R&D Institute Co.Ltd.HangzhouZhejiang 311121China College of Chemistry and Materials Engineering Wenzhou UniversityWenzhouZhejiang 325027China

Organic-inorganic metal-halide perovskite solar cells(PerSCs)have achieved significant progresses due to their outstanding optoelectronic charac-teristics,and the power conversion efficiency(PCE)of single-junction PerSCs has been boosted from 3.8%to a certified 25.2%.However,the efficien-cy of single-junction cells is governed by the Shockley-Queisser(S-Q)radiative limit,and fabricating all-perovskite tandem solar cells is a particularly attractive method to break the S-Q *** the bandgap of lead(Pb)-based mixed halide perovskite can be tuned from 1.55 eV to 2.3 eV,and the mixed tin(Sn)-Pb perovskites have bandgap of~1.2 eV,these perovskites become the best candidates for the front and rear subcells of all-perovskite tandem device,*** this review,we firstly summarize the current development progresses of two-terminal(2-T)all-perovskite tandem so-lar *** further optimizing the device performance,the wide bandgap mixed halide perovskites for front subcell,mixed Sn-Pb narrow bandgap perovskites for rear subcell,and the interconnection layer(ICL)of 2-T tandem device are then *** review aims to open a pathway to real-ize highly efficient all-perovskite tandem solar cells.

关键词： Perovskite phase Tandem solar cells Interconnection layer Energy conversion Complementary absorption

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Multimode Quantum Correlations in Supercontinuum Pulses

arXiv

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arXiv 2024年

作者： Hosaka, Aruto Niimura, Shintaro Tomita, Masaya Omi, Akihito Takeoka, Masahiro Kannari, Fumihiko Mitsubishi Electric Corporation Information Technology R&D Center Kanagawa247-8501 Japan Department of Electronics and Electrical Engineering Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama223-8522 Japan

Suprecontinuum (SC) light contains complex spectral noise structure and its accurate characterization is important for fundamental understanding of its physics as well as for its applications. Several experimental and theoretical noise characterizations have been performed so far. However, none of them takes into account the quantum mechanical properties. Here, we demonstrate experimental characterisation of quantum noise and its spectral correlations formed in the SC light generated from a photonic crystal fiber. Moreover, by applying an appropriate basis transformation to these correlations, we demonstrate that the SC noise amplitude can be squeezed below the shot-noise limit in some bases, even in the presence of excessively large nonlinearities. Copyright © 2024, The Authors. All rights reserved.

关键词： Quantum noise

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