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Practical GHz single-cavity all-fiber dual-comb laser for high-speed spectroscopy

光：科学与应用（英文版） 2025年第5期14卷 1354-1363页

作者： Lin Ling Wei Lin Zhaoheng Liang Minjie Pan Chiyi Wei Xuewen Chen Yang Yang Zhijin Xiong Yuankai Guo Xiaoming Wei Zhongmin Yang School of Physics and Optoelectronics South China University of TechnologyGuangzhouChina School of Physics and Optoelectronics South China University of TechnologyGuangzhouChina School of Materials Science and Engineering Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques South China University of TechnologyGuangzhouChina School of Physics and Optoelectronics South China University of TechnologyGuangzhouChina School of Materials Science and Engineering Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques South China University of TechnologyGuangzhouChina Research Institute of Future Technology South China Normal UniversityGuangzhouChina

Dual-comb spectroscopy(DCS)with few-GHz tooth spacing that provides a better trade-off between spectral resolution and refresh rate is a powerful tool for measuring and analyzing rapidly evolving transient *** such an exciting opportunity,existing technologies compromise either the spectral resolution or refresh rate,leaving few-GHz DCS with robust design largely unmet for frontier *** this work,we demonstrate a novel GHz DCS by exploring the multimode interference-mediated spectral filtering effect in an all-fiber ultrashort cavity *** GHz single-cavity all-fiber dual-comb source is seeded by a dual-wavelength mode-locked fiber laser operating at fundamental repetition rates of about 1.0 GHz differing by 148 kHz,which has an excellent stability in the free-running state that the Allan deviation is only 101.7 mHz for an average time of 1 *** to the large repetition rate difference between the asynchronous dichromatic pulse trains,the GHz DCS enables a refresh time as short as 6.75 μs,making it promising for studying nonrepeatable transient phenomena in real *** this end,the practicality of the present GHz DCS is validated by successfully capturing the'shock waves'of balloon and firecracker explosions *** GHz single-cavity all-fiber dual-comb system promises a noteworthy improvement in acquisition speed and reliability without sacrificing measurement accuracy,anticipated as a practical tool for high-speed applications.

关键词： laser all-fiber dual-comb high-speed practical single-cavity spectroscopy

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Analysis of Stamping Forming and Springback of Arc-shaped Corrugated Diaphragm 7

Analysis of Stamping Forming and Springback of Arc-shaped Co...

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7th International Conference on Mechanical Engineering and Applied Composite Materials, MEACM 2024

作者： Wang, Yu Zhang, Chunguang Li, Shangqing An, Lei Wu, Ye Research and Development Center SINOMACH Sensing Technology Co. Ltd. Shenyang110043 China

The arc-shaped corrugated diaphragm is the packaging component of pressure sensors, and the quality of diaphragms directly affects the performance of pressure sensors. Diaphragms are usually produced by blanking process. Common production defects include the severe warping and the insufficient forming height. In order to reduce production defects, this paper uses the flat punch and the corrugated punch as research objects to clarify the effect of production process and punch structure on diaphragm production quality. The results show that the production process causes the diaphragm to have a convex warping tendency, which is opposite to the warping tendency caused by corrugation. Moving the corrugation away from the center of the diaphragm and increasing the corrugation spacing can improve the diaphragm quality, while the effect of the corrugation height can be ignored. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Diaphragms

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Trajectory Design in Boost Phase of Air-Launched Rocket Based on the Effective Specific Impulse 7

Trajectory Design in Boost Phase of Air-Launched Rocket Base...

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7th International Symposium on Autonomous Systems, ISAS 2024

作者： Wang, Haoliang Ma, Mengying The First Academy of China Aerospace Science and Technology Corporation Research and Development Center Beijing100191 China

ISBN: (纸本)9798350363173

A new trajectory design method of the air-launched rocket is presented in this paper. A dynamic model of the air-launched rocket is built. In order to make efficient use of aerodynamic force in the acceleration process, a new effective specific impulse is presented to analyze the flight characters of the air-launched rocket, by studying the mechanical energy. and the effective specific impulse is researched to analyze the regularity in the accelerated climbing. The results of analysis are used to guide the design of the trajectory. and then, the trajectory design problem is transformed into an optimal problem of single variable. Simulations are provided to demonstrate the effectiveness of the designed method. © 2024 IEEE.

关键词： Rockets

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A SOC Estimation Method for Li-Ion Batteries under High-Rate Pulse Conditions based on AO-BPNN Model

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Space(Science & technology) 2023年第1期3卷 620-631页

作者： Zhicheng Fu Bingxiang Sun Jie Gong Minming Gong XinZe Zhao Shichang Ma National Energy Active Distribution Network Technology Research and development Center College of Electrical EngineeringBeijing Jiaotong UniversityBeijingChina

The estimation of state of charge(SOC)in lithium-ion batteries is important for ensuring the safe and stable operation of battery *** high-rate pulse conditions,the characteristics of short discharge time,high frequency,large current,strong interference,and complex transient characteristics that make lithium-ion batteries exhibit marked nonlinear *** existing battery management system has difficulties in capturing the rising and falling edge data of the pulses due to limitations in the sampling *** short idle time makes it challenging to obtain accurate open-circuit voltage,and there are difficulties in identifying the model ***,using a combination of coulomb counting method,open-circuit voltage correction method,and Kalman filtering method to estimate SOC poses certain *** study applies backpropagation neural network(BPNN)combined with Aquila optimizer(AO)algorithm to estimate SOC under high-rate pulse conditions,and experimental verification is performed using special 3-Ah lithium iron phosphate *** compared the estimation accuracy of the AO-BPNN model for SOC with the BPNN,support vector machine,extreme learning machine,and Fuzzy neural network models and verified the superiority of ***,by utilizing data with larger acquisition intervals,we obtained accurate evaluation results and reduced the data *** effectiveness of the assessment of AO-BPNN was individually verified under different high-rate pulse conditions and different static times through pulse experiments conducted under 9 operating conditions,with the estimation error controlled within 5%.Finally,the robustness of the proposed model was validated using test data with different sampling intervals and random measurement errors.

关键词： battery BPNN SOC

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Design and fabrication of metal spherical conformal thin film multisensor for high-temperature environment

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Chinese Journal of Aeronautics 2024年第11期37卷 535-547页

作者： Lida XU Xiong ZHOU Yong HUANG Yusen WANG Chenhe SHAO Yuelong LI Lingyun WANG Qingtao YANG Daoheng SUN Qinnan CHEN Discipline of Intelligent Instrument and Equipment Pen-Tung Sah Institute of Micro-Nano Science and TechnologyXiamen UniversityXiamen 361102China Fujian Micro/nano Manufacturing Engineering Technology Research Center Xiamen UniversityXiamen 361102China China Aerodynamics Research and Development Center Mianyang 621000China

Conformal thin-film sensors enable precise monitoring of the operating conditions of components in extreme ***,the development of these sensors encounters major challenges,especially in uniformly applying multiple film layers on complex metallic surfaces and accurately capturing diverse operational *** work reports a multi-sensor design and multi-layer additive manufacturing process targeting spherical metallic *** proposed high-temperature dip-coating and self-leveling fabrication process achieves high-temperature thin-film coatings with excellent uniformity,high-temperature electrical insulation,and adhesion *** fabricated Ag/Pt thin film thermocouple arrays and a heat flux sensor exhibit a maximum temperature resistance of up to 960℃,with thermoelectric potential outputs and hightemperature resistance closely mirroring those of wire-based Ag/Pt *** environmental testing was conducted using high-power lasers and a flame *** results show that the array of thin-film conformal thermocouples more accurately reflected temperature changes at different points on a spherical *** heat flux sensors achieve responses within 95 ms and with-stand environments with heat fluxes over 1.2 MW/m^(2).The proposed multi-sensor design and fabrication method offers promising monitoring applications in harsh environments,including aerospace and nuclear power.

关键词： Conformal thin-film sensor Metallic spherical surfaces Multi-sensor perception Harsh environments Additive manufacturing

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Flexiswap: A Cross-Chain Decentralized Exchange Protocol 17

Flexiswap: A Cross-Chain Decentralized Exchange Protocol

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17th International Conference on COMmunication Systems and NETworkS, COMSNETS 2025

作者： Singh, Kirti Ribeiro, Vinay J. Mandal, Susmita Indian Institute of Technology Bombay Department of Computer Science and Engineering Mumbai India Institute for Development and Research in Banking Technology Hyderabad India

ISBN: (纸本)9798331531195

Decentralized exchanges (DEXs) have emerged as a promising solution to enhance trustlessness in blockchain ecosystems and mitigate security threats associated with centralized exchanges. While platforms like Uniswap offer certain advantages, their limitation to exchanging tokens within a single blockchain restricts their utility. Moreover, exchanges relying on atomic swaps, such as AtomicDEX, are susceptible to grief attacks and exhibit low success ratios. In response to these challenges, we introduce FlexiSwap, an auction-based decentralized exchange protocol that leverages atomic swaps for exchanging native tokens between smart contract-compatible blockchains. FlexiSwap stands out by combining multiple bids to facilitate one-to-many exchanges, resulting in improved exchange values, successful execution of large-volume exchanges, and an improved success ratio. The protocol incorporates a penalization mechanism to deter grief attacks, ensuring that participants cannot withdraw from an exchange without incurring a loss once the counterparty has committed its assets. We also prove the protocol's safety, liveness, and grief prevention. Our simulation results demonstrate that combining multiple bids helps achieve better exchange values and order-matching success rates. Additionally, we implemented our protocol on Ethereum-based blockchains. The experimental results show that combining bids increases overall gas usage, but the increase in the average gas user per bid is marginal. © 2025 IEEE.

关键词： Kyoto Protocol

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Analysis of stiffness characteristics of helical compression springs used in high-precision instruments 9

Analysis of stiffness characteristics of helical compression...

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2024 9th International Conference on Mechanical Structures and Smart Materials, ICMSSM 2024

作者： Wang, Yu Zhang, Chunguang Li, Shangqing Li, Zhichao Gong, Yingjiao Liu, Jiarui Research and Development Center SINOMACH Sensing Technology Co. Ltd. Shenyang110043 China

Under working conditions of high-temperature, high-pressure, and strong corrosion, helical compression springs used in high-precision instruments need to maintain linear characteristics and impact resistance. To solve the problem of significantly reduced instrument accuracy due to the stiffness drift of current helical compression springs, compression stiffness characteristics are analyzed through compression tests and finite element simulations. The results indicate that the stiffness drift is caused by the sliding displacement of helical compression springs after being compressed and self-contacted. With the premise of minimizing overall effect on instruments, the helical compression spring structure was redesigned to eliminate the stiffness drift and meet requirements for impact resistance. © Published under licence by IOP Publishing Ltd.

关键词： High temperature corrosion

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Urban Climate Resilient development: Analysis of the Potential to Build Low-Carbon-Resilient City in China

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Chinese Journal of Urban and Environmental Studies 2024年第4期12卷 131-149页

作者： ZHENG Yan YUAN Yuan TIAN Jianguo ZHUANG Guiyang Research Institute of Eco-Civilization Research Centre for Sustainable Development Chinese Academy of Social Sciences College of Applied Economics University of Chinese Academy of Social Sciences School of Economics Beijing Technology and Business University Green Development Institute University of Jinan

The Sixth Assessment Report(AR6) of the United Nations Intergovernmental Panel on Climate Change(IPCC) highlights that Climate Resilient development(CRD) can support sustainable development for all by reducing greenhouse gas emissions and offering adaptation options, while also contributing to innovation and transformation in urban areas. Based on China's national pilot projects for low-carbon cities, sponge cities, and climate-resilient cities, this paper analyzes the potential and feasibility of Chinese cities in exploring the construction of “low-carbon-resilient cities”. First, referring to the relevant studies, the “Climate-Resilient Index” and “Low-Carbon development Index” are constructed for 178 cities at or above the prefecture level in ***, by comparing the climate resilience index and the level of low-carbon development, this paper categorizes 178 Chinese cities into four groups with the potential to the co-benefits of synergy actions in mitigation and adaptation. Third, this paper showcases the potential and progress from some pilot model cities of the “climate-adaptive cities” in achieving the goal of“climate resilient development”. This paper will help advance China's synergistic implementation of climate adaptation and mitigation policies, and provide examples and insights for cities in other developing countries to promote climate resilient development.

关键词： Climate resilient development climate-resilient cities low-carbon-resilient cities adaptation to climate change co-benefits

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Determining the parameters and chemical behaviour of the overdriven detonation reaction zone of CL-20-based aluminized explosives

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Defence technology(防务技术) 2025年第5期47卷 46-66页

作者： Moyan Liu Yan Liu Fan Bai Hongfu Wang Shanyong Chu Fenglei Huang State Key Laboratory of Explosion Science and Safety Protection Beijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China China Research and Development Academy of Machinery Equipment Beijing 100089China

The new CL-20(hexanitrohexaazaisowurtzitane)type aluminized explosives in the overdrive detonation(ODD)conditions of the core problem is how to accurately represent the state of the overdrive detonation *** this end,this paper is based on the impedance matching method to test the ODD conditions of CL-20 type aluminium explosive particle *** the interfacial pressure of the shock wave in different *** the characteristic parameters of the reaction zone of the detonation of CL-20 aluminized *** the parameters of the JoneseWilkinseLee(JWL)+γ equation for the detonation products(DPs).Revealed the effect of different DPs equation of state(EOS)on the Hugoniot pressure of *** results indicate that when the content of aluminum powder ranges from 0%to 30%,the duration of the ODD reaction zone and the width of the detonation reaction zone of the CL-20-based aluminized explosive are directly proportional to the content of aluminum *** width of the detonation reaction zone is increased by 1.97 times to 2.7 times compared to that of the reaction zone without the addition of aluminum ***,the energy release efficiency of the detonation reaction zone is inversely proportional to the content of aluminum *** the aluminum powder content was held constant,the incorporation of AP caused a 25%reduction in the energy release efficiency of the detonation reaction *** with existing ODD state equations,the JWL +γ equation is superior in calibrating overpressure Hugoniot data and the isentropic expansion in the C-J *** deviation between calculated pressure results and experimental measurements is within 6%.

关键词： Equation of state for ODD CL-20-based aluminized explosives Detonation reaction zone Impedance matching Interfacial particle velocity

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Operating characteristics and evaluation of air source heat pumps in cold regions during heating season in China

Energy and Built Environment

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Energy and Built Environment 2025年第4期6卷 645-654页

作者： Liu, Xin Zhou, Qiannan Huang, Kailiang Wu, Yue Liang, Chuanzhi Cao, Huihong Wei, Jie School of Municipal and Environment Engineering Shenyang Jianzhu University Shenyang100168 China China Association of Building Energy Efficiency Beijing100089 China Dalian University of Technology Civil Architecture Design & Research Institute Co. LTD Dalian116000 China Ministry of Housing and Urban-Rural Development Science and Technology Development Promotion Center Beijing100835 China

The mismatch between the actual heat production of an air source heat pump (ASHP) and the instantaneous load of the building it heats is a critical cause of low energy efficiency. research on the measured heating effect provides an effective approach to improve the energy efficiency of an ASHP. This study therefore focused on two small office buildings to explore the operating data describing the ASHP system source and load sides during the heating season. A sensitivity analysis was employed to explore the actual operational effects of the ASHP. Common problems associated with system operation were comprehensively identified, including the operation characteristics, energy efficiency coefficients, load characteristics, and energy consumption characteristics of the transmission and distribution systems. The effects of these problems were evaluated from three perspectives: integrated part load value (IPLV), system performance loss, and indoor environmental parameters. The results shows that the highest coefficient of performance (COP) of the ASHP in Building A was 3.27 while the IPLV was 2.68, operating status reached the standard. The COP value of the ASHP in Building B was 1.55 while the IPLV was 2.45. Poor value shows the low performance in operating phase, which can be further optimised by matching the building instantaneous load to the heat production of the ASHP, improves the operating effect of two buildings comprehensively. © 2024

关键词： Energy utilization

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