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Finesse measurement for high-power optical enhancement cavity

Chinese Physics B 2024年第1期33卷 414-421页

作者：陆心怡柳兴田其立王焕汪嘉俊颜立新 Department of Engineering Physics Tsinghua UniversityBeijing 100084China Key Laboratory of Particle&Radiation Imaging Ministry of EducationBeijing 100084China

Finesse is a critical parameter for describing the characteristics of an optical enhancement cavity(OEC). This paper first presents a review of finesse measurement techniques, including a comparative analysis of the advantages, disadvantages, and potential limitations of several main methods from both theoretical and practical perspectives. A variant of the existing method called the free spectral range(FSR) modulation method is proposed and compared with three other finesse measurement methods, i.e., the fast-switching cavity ring-down(CRD) method, the rapidly swept-frequency(SF) CRD method, and the ringing effect method. A high-power OEC platform with a high finesse of approximately 16000 is built and measured with the four methods. The performance of these methods is compared, and the results show that the FSR modulation method and the fast-switching CRD method are more suitable and accurate than the other two methods for high-finesse OEC measurements. The CRD method and the ringing effect method can be implemented in open loop using simple equipment and are easy to perform. Additionally, recommendations for selecting finesse measurement methods under different conditions are proposed, which benefit the development of OEC and its applications.

关键词： optical enhancement cavity finesse measurement cavity ring-down ringing effect

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Metabolomic and gut-microbial responses of earthworms exposed to microcystins and nano zero-valent iron in soil

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Journal of Environmental Sciences 2025年第4期150卷 340-348页

作者： Yifan Wang Chunlong Zhang Daohui Lin Jianying Zhang College of Environmental and Resource Sciences Zhejiang UniversityHangzhou 310058China National Demonstration Center for Experimental Environment and Resources Education Zhejiang UniversityHangzhou 310058China Department of Environmental Sciences University of Houston-Clear LakeHoustonTX 77058USA Institute of Environmental Health Zhejiang UniversityHangzhou 310058China Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control Hangzhou 310058China

The earthworm-based vermiremediation facilitated with benign chemicals such as nano zero-valent iron(nZVI)is a promising approach for the remediation of a variety of soil contaminants including *** themost toxic cyanotoxin,microcystin-LR(MC-LR)enter soil via runoff,irrigated surface water and sewage,and the application of cyanobacterial biofertilizers as part of the sustainable agricultural *** in such remediation systems must sustain the potential risk from both nZVI and *** the present study,earthworms(Eisenia fetida)were exposed up to 14 days to MC-LR and nZVI(individually and inmixture),and the toxicity was investigated at both the organismal andmetabolic levels,including growth,tissue damage,oxidative stress,metabolic response and gut *** showed that co-exposure of MC-LR and nZVI is less potent to earthworms than that of separate *** observations in the co-exposure group revealed only minor epidermal brokenness,and KEGG enrichment analysis showed that co-exposure induced earthworms to regulate glutathione biosynthesis for detoxification and reduced adverse effects from *** combined use of nZVI promoted the growth and reproduction of soil and earthworm gut bacteria(e.g.,Sphingobacterium and Acinetobacter)responsible for the degradation of MC-LR,whichmight explain the observed antagonism between nZVI and MC-LR in earthworm *** study suggests the beneficial use of nZVI to detoxify pollutants in earthworm-based vermiremediation systems where freshwater containing cyanobacterial blooms is frequently used to irrigate soil and supply water for the growth and metabolism of earthworms.

关键词： Nano zero-valent iron Microcystin-LR Mixed exposure Vermiremediation Metabolic pathways Gut microbiota

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Towards High-Performance Graph Processing: From a Hardware/Software Co-Design Perspective

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Journal of Computer Science & Technology 2024年第2期39卷 245-266页

作者：廖小飞赵文举金海姚鹏程黄禹王庆刚赵进郑龙张宇邵志远 National Engineering Research Center for Big Data Technology and System School of Computer Science and Technology Huazhong University of Science and TechnologyWuhan 430074China Services Computing Technology and System Laboratory School of Computer Science and Technology Huazhong University of Science and TechnologyWuhan 430074China Cluster and Grid Computing Laboratory School of Computer Science and TechnologyHuazhong University of Science and TechnologyWuhan 430074China Zhejiang Lab Hangzhou 311121China

Graph processing has been widely used in many scenarios,from scientific computing to artificial *** processing exhibits irregular computational parallelism and random memory accesses,unlike traditional ***,running graph processing workloads on conventional architectures(e.g.,CPUs and GPUs)often shows a significantly low compute-memory ratio with few performance benefits,which can be,in many cases,even slower than a specialized single-thread graph *** domain-specific hardware designs are essential for graph processing,it is still challenging to transform the hardware capability to performance boost without coupled software *** article presents a graph processing ecosystem from hardware to *** start by introducing a series of hardware accelerators as the foundation of this ***,the codesigned parallel graph systems and their distributed techniques are presented to support graph ***,we introduce our efforts on novel graph applications and hardware *** results show that various graph applications can be efficiently accelerated in this graph processing ecosystem.

关键词： graph processing hardware accelerator software system high performance ecosystem

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CMOS direct conversion X-ray detector coupled with fluorinated liquid

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Nuclear Science and Techniques 2025年第1期36卷 59-68页

作者： Shi-Hua Liu Chao-Song Gao Xin Zhang Xiang-Ming Sun Meng Wu Zhi-Hui Han Tong Wan Yong-Shuai Ge Key Laboratory of Quark&Lepton Physics(MOE) Central China Normal UniversityWuhan 430079China Guizhou Education University Guiyang 550018China Research Center for Medical Artificial Intelligence Chinese Academy of SciencesShenzhen Institutes of Advanced TechnologyShenzhen 518055China

X-ray detectors show potential applications in medical imaging,materials science,and nuclear *** achieve high detection efficiency and spatial resolution,many conventional semiconductor materials,such as amorphous selenium,cadmium telluride zinc,and perovskites,have been utilized in direct conversion X-ray ***,these semiconductor materials are susceptible to temperature-induced performance degradation,crystallization,delamination,uneven lattice growth,radiation damage,and high dark *** study explores a new approach by coupling an FC40 electronic fluorinated liquid with a specialized high-resolution and high-readout-speed complementary metal-oxide-semiconductor(CMOS)pixel array,specifically the Topmetal II−chip,to fabricate a direct conversion X-ray *** fluorinated liquid FC40(molecular formula:C_(21)F_(48)N_(2))is an electronic medium that is minimally affected by temperature and displays no issues with uniform *** exhibits a low dark current and minimal radiation damage and enables customizable thickness in X-ray *** addresses the limitations inherent in conventional semiconductor-based *** this study,simple X-ray detector imaging tests were conducted,demonstrating the excellent coupling capability between FC40 electronic fluorinated liquid and CMOS chips by the X-ray detector.A spatial resolution of 4.0 lp/mm was measured using a striped line par card,and a relatively clear image of a cockroach was displayed in the digital radiography imaging *** test results indicated the feasibility of fabricating an X-ray detector by combining FC40 electronic fluorinated liquid and CMOS *** to the absence of issues related to chip-material coupling,a high spatial resolution could be achieved by reducing the chip pixel *** method presents a new avenue for studies on novel liquid-based direct conversion X-ray detectors.

关键词： FC40 electronic fluorinated liquid CMOS pixel chip X-ray detector Spatial resolution

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development of a coupled model to simulate and assess arsenic contamination and impact factors in the Jinsha River Basin,china

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Journal of Environmental Sciences 2025年第1期147卷 50-61页

作者： Yidian Sun Xu Zhang Hong Peng Wenting Zhou Anna Jiang Feng Zhou Hao Wang Wanshun Zhang School of Resource and Environmental Sciences Wuhan UniversityWuhan 430079China School of Water Conservancy and Hydropower Engineering Wuhan UniversityWuhan 430072China China Institute of Water Resources and Hydropower Research Beijing 100038China School of Water Resources and Hydropower State Key Laboratory of Water Resources and Hydropower Engineering ScienceWuhan UniversityWuhan 430072China

With the increasing severity of arsenic(As)pollution,quantifying the environmental behavior of pollutant based on numerical model has become an important approach to determine the potential impacts and finalize the precise control *** the industrialintensive Jinsha River Basin as typical area,a two-dimensional hydrodynamic water quality model coupled with Soil andWater Assessment Tool(SWAT)model was developed to accurately simulate the watershed-scale distribution and transport of As in the terrestrial and aquatic environment at high spatial and temporal *** effects of hydro-climate change,hydropower station construction and non-point source emissions on Aswere quantified based on the coupled *** result indicated that higher As concentration areas mainly centralized in urban districts and concentration slowly decreased from upstream to *** to the enhanced rainfall,the As concentration was significantly higher during the rainy season than the dry ***-climate change and the construction of hydropower station not only affected the dissolved As concentration,but also affected the adsorption and desorption of As in ***,As concentration increased with the input of non-point source pollution,with the maximum increase about 30%,resulting that non-point sources contributed important pollutant impacts to *** coupled model used in pollutant behavior analysis is generalwith high potential application to predict and mitigate water pollution.

关键词： Watershed system Arsenic Modeling Distribution Hydro-climate change Non-point source pollution

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An improved pulse coupled neural networks model for semantic IoT

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Digital Communications and Networks 2024年第3期10卷 557-567页

作者： Rong Ma Zhen Zhang Yide Ma Xiping Hu Edith C.H.Ngai Victor C.M.Leung School of Information Science and Engineering Lanzhou UniversityLanzhou 730000China School of Medical Technology Beijing Institute of TechnologyBeijing100081China Department of Electrical and Electronic Engineer The University of Hong KongHong Kong 999077China College of Computer Science and Software Engineering Shenzhen UniversityShenzhen 518060China Department of Electrical and Computer Engineering the University of British ColumbiaVancouverBC V6T 1Z4Canada

In recent years,the Internet of Things(IoT)has gradually developed applications such as collecting sensory data and building intelligent services,which has led to an explosion in mobile data ***,with the rapid development of artificial intelligence,semantic communication has attracted great attention as a new communication ***,for IoT devices,however,processing image information efficiently in real time is an essential task for the rapid transmission of semantic *** the increase of model parameters in deep learning methods,the model inference time in sensor devices continues to *** contrast,the Pulse Coupled Neural Network(PCNN)has fewer parameters,making it more suitable for processing real-time scene tasks such as image segmentation,which lays the foundation for real-time,effective,and accurate image ***,the parameters of PCNN are determined by trial and error,which limits its *** overcome this limitation,an Improved Pulse Coupled Neural Networks(IPCNN)model is proposed in this *** IPCNN constructs the connection between the static properties of the input image and the dynamic properties of the neurons,and all its parameters are set adaptively,which avoids the inconvenience of manual setting in traditional methods and improves the adaptability of parameters to different types of *** segmentation results demonstrate the validity and efficiency of the proposed self-adaptive parameter setting method of IPCNN on the gray images and natural images from the Matlab and Berkeley Segmentation *** IPCNN method achieves a better segmentation result without training,providing a new solution for the real-time transmission of image semantic information.

关键词： Internet of things(IoT) Semantic information Real-time application Improved pulse coupled neural network Image segmentation

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Study on concentration distribution and detonation characteristics for non-axisymmetric fuel dispersal

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Defence Technology（防务技术） 2024年第1期31卷 484-495页

作者： Linghui Zeng Zhongqi Wang Xing Chen Jianping Li State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China College of Environment and Chemical Engineering Sichuan University of Science&EngineeringZigong643000China

The study of non-axisymmetric fuel dispersal and detonation can provide reference for the prevention of industrial cloud explosion accidents and the design of fuel air explosive(FAE).The concentration and detonation fields of 85 kg cylindrical and fan-shaped fuel are investigated by experiments and numerical simulations.A dynamic model of the whole process for fuel dispersal and detonation is *** concentration distribution of fuel is used as the initial condition to calculate the detonation stage,thus solving the initial value problem of detonation *** phase and component changes of fuel cloud at different locations are *** fuel cloud is divided into directions of 0°,90°,135°and 180°.The results show that the maximum cloud radius is 20.94 m in 135°and the minimum is 12.04 m in 0°.The diameter of the detonation fireball is 53.6 m,and the peak temperature is 3455 *** highest peak overpressure is 3.44 MPa in 0°and the lowest is 2.97 MPa in 135°.The proportion of liquid phase in 0°is22.90%,and the fuel loss is 11.8% and 9% higher than that in 135°and cylindrical charge,*** stable propagation distance of blast wave in 135°is 42.50% longer than 0°and 28.37% longer than cylindrical charge.

关键词： Fuel dispersal Concentration distribution Detonation characteristic Fuel loss Numerical simulation

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Review on the recent progress of nearly zero energy building frontiers in china

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Science china(Technological Sciences) 2024年第9期67卷 2620-2636页

作者： LYU YanJie XU Wei ZHANG ShiCong SUN DeYu HOU YueBin China Academy of Building Research Beijing 100013China

Energy efficiency improvement in Chinese construction has progressed rapidly over the past two *** zero energy buildings(NZEBs),as an integrated solution for energy-efficient construction,have gained significant attention during china's 13th Five-Year Plan period,with continuous maturation of the technical *** this study,a research framework built upon the accomplishments of china's national key research and development program is developed,and an in-depth analysis of the most cutting-edge research is provided by thoroughly reviewing the work conducted *** NZEB in china has been categorized into three stages based on the characteristics of technological development:(1)definition and standards,(2)demonstration and promotion,and(3)cross-domain *** study discerns four noteworthy development trends by examining comprehensive data spanning the last decade from 100 NZEB and zero energy ***,a comprehensive analysis of essential technology advancements in line with these identified trends is *** issues and challenges arising from the increased application of renewable energy in the context of china's carbon peak and carbon neutrality goals have also been ***,based on this analysis,the challenges and corresponding suggestions for future research directions were proposed to help guide future studies exploring emerging trends in the NZEB field.

关键词： nearly zero energy building energy efficiency load flexibility heat pump renewable energy

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Four-wave mixing Bragg scattering for small frequency shift from silicon coupled microrings

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Chinese Physics B 2025年第1期34卷 351-355页

作者： Chang Zhao Chao Wu Pingyu Zhu Yuxing Du Yan Wang Miaomiao Yu Kaikai Zhang Ping Xu Institute for Quantum Information&State Key Laboratory of High Performance Computing College of Computer Science and TechnologyNational University of Defense TechnologyChangsha 410073China

Frequency conversion is pivotal in nonlinear optics and quantum optics for manipulating and translating light signals across different wavelength *** frequency conversion between two light beams with a small frequency interval is a central *** this work,we design a pair of coupled silicon microrings wherein coupled-induced modesplitting exists to achieve a small frequency shift by the process of four-wave mixing Bragg *** an example,the signal can be up or down converted to the idler which is 15.5 GHz spaced when two pumps align with another pair of split *** results unveil the potential of coupled microring resonators for small interval frequency conversion in a high-fidelity,all-optical,and signal processing quantum frequency interface.

关键词： four-wave mixing Bragg scattering silicon coupled microrings

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Selective Microcrystalline Cellulose Extraction from Chinese Medicine Residues via Direct PMS Oxidation

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Engineering 2024年第12期43卷 139-145页

作者： Jinjing Huang Xia Liu Kaixing Fu Shengyun Yang Shiqing Zhou Jinming Luo State Environmental Protection Key Laboratory of Environmental Health Impact Assessment of Emerging Contaminants School of Environmental Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071China Jiangxi Weiqing Environmental Engineering Co. Ltd.Nanchang 330038China Hunan Engineering Research Center of Water Security Technology and Application College of Civil EngineeringHunan UniversityChangsha 410082China

The valorization of Chinese medicine residues(CMRs)into high-value-added products,such as microcrystalline cellulose(MCC),has garnered significant interest in the current post-pandemic era,particularly in regions where Chinese medicine(CM)is widely utilized(i.e.,southeast Asia).In this study,we propose a facile and economical protocol for selectively extracting MCC from CMRs via one-step direct peroxymonosulfate(PMS)oxidation without the need for intricate ***,our proposed protocol has been verified to be versatile and can be applied to various solid waste sources rich in cellulose,with an average extraction rate of 75%.Analysis using the Fukui index revealed that theβ-O-4 bond,the aromatic ring in lignin,specific O sites in hemicellulose,and the amorphous region of cellulose are more susceptible to electrophilic attack by PMS than to reactions involving HO^(·),SO_(4)^(·-),or^(1)O_(2).Leveraging this distinct mechanism,the extracted MCC demonstrated ultrahigh purity(~95%)and crystallinity(~85.36%).Overall,our work involves transforming solid waste into high-value products through the provision of a technical solution,with the potential for onsite *** represents a significant advancement to the valorization of CMRs,particularly in providing theoretical guidance for accelerating the recycling of waste materials.

关键词： Chinese medicine residues Microcrystalline cellulose PMS oxidation Electrophilic attacks

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