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A nanosecond level current pulse capture taper optical fiber probe based on micron level nitrogen-vacancy color center diamond

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Chinese Physics B 2024年第12期33卷 39-44页

作者： Yuchen Bian Yangfan Mao Honghao Chen Shiyu Ge Wentao Lu Chengkun Wang Sihan An Guanxiang du Portland Institute Nanjing University of Posts and TelecommunicationsNanjing 210000China College of Telecommunication and Information Engineering Nanjing University of Posts and TelecommunicationsNanjing 210000China

This work demonstrates a micron-sized nanosecond current pulse probe using a quantum diamond magnetometer.A micron-sized diamond crystal affixed to a fiber tip is integrated on the end of a conical *** demonstrate real-time visualization of a single 100 nanosecond pulse and discrimination of two pulse trains of different frequencies with a coplanar waveguide and a home-made PCB *** technique finds promising applications in the display of electronic stream and can be used as a pulse discriminator to simultaneously receive and demodulate multiple pulse *** method of detecting pulse current is expected to provide further detailed analysis of the internal working state of the chip.

关键词： pulse capture nitrogen-vacancy(NV)color center current imaging chip detection

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detection and counting method of juvenile abalones based on improved SSd network

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Information Processing in Agriculture 2024年第3期11卷 325-336页

作者： runxue Su Jun Yue Zhenzhong Li Shixiang Jia Guorui Sheng School of Information and Electrical Engineering Ludong UniversityYantai 264025China Shandong Dongrun Instrument Technology Co. Ltd.Yantai 264000China

detection and counting of abalones is one of key technologies of abalones breeding density *** abalones in the breeding stage are small in size,densely distributed,and occluded between individuals,so the existing object detection algorithms have low precision for detecting the abalones in the breeding *** solve this problem,a detection and counting method of juvenile abalones based on improved SSd network is proposed in this *** innovation points of this method are:Firstly,the multi-layer feature dynamic fusion method is proposed to obtain more color and texture information and improve detection precision of juvenile abalones with small size;secondly,the multiscale attention feature extraction method is proposed to highlight shape and edge feature information of juvenile abalones and increase detection precision of juvenile abalones with dense distribution and individual coverage;finally,the loss feedback training method is used to increase the diversity of data and the pixels of juvenile abalones in the images to get the even higher detection precision of juvenile abalones with small *** experimental results show that the AP@0.5 value,AP@0.7 value and AP@0.75 value of the detection results of the proposed method are 91.14%,89.90% and 80.14%,*** precision and recall rates of the counting results are 99.59% and 97.74%,respectively,which are superior to the counting results of SSd,FSSd,MutualGuide,Efficientdet and VarifocalNet *** proposed method can provide support for real-time monitoring of aquaculture density for juvenile abalones.

关键词： Juvenile abalones Object detection SSd network Multi-layer feature dynamic fusion Multi-scale attention feature extraction Loss feedback training

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Micron-resolved quantum precision measurement of magnetic field at the Tesla level

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Chinese Physics B 2024年第12期33卷 95-99页

作者： Si-Han An Shi-Yu Ge Wen-Tao Lu Guo-Bin Chen Sheng-Kai Xia Ai-Qing Chen Cheng-Kun Wang Lin-Yan Yu Zhi-Qiang Zhang Yang Wang Gui-Jin Tang Hua-Fu Cheng Guan-Xiang du College of Telecommunications and Information Engineering Nanjing University of Posts and TelecommunicationsNanjing 210003China Portland Institute Nanjing University of Posts and TelecommunicationsNanjing 210023China The School of Mechanical and Electrical Engineering Suqian CollegeSuqian 223800China School of Computer Science Nanjing University of Posts and TelecommunicationsNanjing 210023China School of Science Nanjing University of Posts and TelecommunicationsNanjing 210023China Yichang Testing Technique R&D Institute Yichang 443003China

We develop a quantum precision measurement method for magnetic field at the Tesla level by utilizing a fiber diamond *** to our system is a micron-sized fiber diamond probe positioned on the surface of a coplanar waveguide made of nonmagnetic *** with a nuclear magnetic resonance magnetometer,this probe demonstrates a broad magnetic field range from 10 mT to 1.5 T with a nonlinear error better than 0.0028%under a standard magnetic field generator and stability better than 0.0012%at a 1.5 T magnetic ***,we demonstrate quantitative mapping of the vector magnetic field on the surface of a permanent magnet using the diamond magnetometer.

关键词： nitrogen-vacancy center fiber diamond magnetometer precision measurement

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Voltage-dependent P-Q reserve Capacity Evaluation for TSO-dSO Interface Considering Uncertainties of dGs and FLs

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CSEE Journal of Power and Energy Systems 2024年第5期10卷 1935-1954页

作者： Yeyan Xu Liangzhong Yao Tianjiao Pu Siyang Liao Fan Cheng Ye Li Xinying Wang School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China China Electric Power Research Institute Beijing 100085China. China Electric Power Research Institute Beijing 100192China.

Increasing distributed generators(dGs)and flexible loads(FLs)enable distribution systems to provide both active and reactive power reserves(P-Q reserves)in supporting the frequency and voltage regulations of transmission ***,such requirements at the interface between the transmission system operator(TSO)and distribution system operator(dSO)affect the distribution system operation security,considering the uncertainties of dGs and *** exploit the reserve potential of distribution systems,this paper investigates the voltagedependent P-Q reserve capacity(V-PQrC)of such types of distribution systems.V-PQrC reflects the feasible space of PQ reserves that the dSO can provide to the TSO taking the voltage deviation limit at TSO-dSO interface into consideration,while ensuring the distribution system operation security under uncertainties of dGs and *** evaluation method for VPQrC at the TSO-dSO interface is *** improve the robust performance of the evaluation method,the dG uncertainty is captured by a generalized ambiguity set and the FL uncertainty is addressed by designing a constrained sliding mode controller(CSMC).Three objectives are considered in the evaluation,i.e.,P reserve capacity,Q reserve capacity,and the voltage deviation limit at the TSO-dSO ***,a multiobjective optimization model integrating the generalized robust chance-constrained optimization and CSMC(GrCC-CSMC)is established for V-PQrC evaluation to obtain the Pareto optimal reserve ***,a non-approximated selecting(NAS)method is proposed to build up a simplified V-PQrC linear model,which can be convenient to apply in the transmissiondistribution system *** results reveal that the V-PQrC evaluation method can achieve a good performance of accuracy and robustness against uncertainties.

关键词： Generalized robust chance-constrained optimization reserve capacity evaluation sliding mode control transmission-distribution system coordination voltage-dependent P-Q reserve capacity

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Bridgman growth and characterization of langanite(La_3Ga_(5.5)Nb_(0.5)O_(14),LGN)single crystal

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Journal of rare Earths 2025年第3期43卷 584-590,I0006页

作者： Chengkai ren Libin Yin Shuai Wang Weirong Chen Sheng Wang Kainan Xiong Xiaoniu Tu Ningzhong Bao Yanqing Zheng Jun Chen Erwei Shi Institute of Ceramics Chinese Academy of SciencesShanghai201800 China State Key Laboratory of Material-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing210009China The State Key Discipline Laboratory of Wide Bandgap Semiconductor Technology School of MicroelectronicsXidian UniversityXi'an710071China College of Materials Science and Chemical Engineering Ningbo UniversityNingbo315211China Beijing Advanced Innovation Center for Materials Genome Engineering Department of Physical ChemistryUniversity of Science and Technology BeijingBeijing100083China Hainan University Haikou570228China

As a promising optical and piezoelectric crystal,efficient growth of LGN single crystal is crucial for its practical ***,a langanite(La_(3)Ga_(5.5)Nb_(0.5)O_(14),LGN)crystal with high quality was successfully grown by the Bridgman method along the Z *** order to prepare high-purity polycrystalline precursors for LGN crystal growth,the sintering conditions of LGN polycrystalline precursors were studied in *** melting point of LGN was also measured to provide a reference for the crystal growth *** the[001]oriented wafer,the full width at half maximum(EWHM)value of the nigh-resolution X-ray diffraction(HrXrd)analysis is 38.52",demonstrating that the LGN crystal exhibits excellent crystalline *** addition,we also measured the thermal properties and transmission spectrum of the as-grown LGN *** is found that the absorption peak at 1.85μm of the LGN crystal grown in air using the Bridgman method disappears compared with previous reports(grown in N_(2+)(1-3)vol%O_(2)atmosphere),which is attributed to the oxygen-enriched growth *** phenomenon also occurs in other LGS-type disordered *** is believed that these findings may expand the potential applications of LGS series crystals at 1.85μm.

关键词： Langanite rare earths Bridgman method Oxygen-enriched growth Optical materials

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design and test of reel speed control system for soybean combine harvester in the strip intercropping mode

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SCIENTIFIC rEPOrTS 2024年第1期14卷 1-26页

作者： Leng, Yuancai Fu, Yuan Liu, Kaiyan Tang, Peng Tang, Jialong Wang, renqi Lv, Xiaorong Sichuan Agr Univ Sch Machinery & Elect Yaan 625014 Peoples R China Lezhi Cty Agr & Rural Affairs Bur Ziyang 641500 Peoples R China

At present, the speed of the reel of soybean combine harvester is mainly adjusted manually, and basically does not have the ability to automatically adjust the speed of the reel according to changes in crops or working speed. In the maize-soybean strip intercropping mode, soybean plants are densely planted. during harvesting, the feeding rate increases, making it even more necessary to adjust the reel speed according to the growth status of the crops. This article uses PLC as the main control platform to design a reel speed control system for the existing combine harvester. Tests have shown that the control system can meet the requirements for reel speed control. The relative error of the reel control system's speed test is 2.6%, the relative error of the operating speed is 6.77%, and the maximum relative error of the automatic control of the reel speed is 5.38%. Compared with traditional reel, it reduces header loss by 2.12%. The soybean combine harvester reel speed control system designed in this article can realize automatic adjustment of the reel speed, reduce feeding losses caused by changes in crop height, changes in feed volume, and untimely adjustment of the reel, and can reduce header loss, increased crop yield.

关键词： Soybean combine harvester Maize-soybean strip intercropping mode reel Speed control

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Chromosome-level genome assembly of the Asian citrus psyllid,diaphorina citri

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Insect Science 2024年第1期31卷 13-27页

作者： Shuang Lei Shi-Jiang Yu Qi Pan Li-Li ding Si-Chen Li Lu-Yan Cheng Shu-Qi Wang Bing-Hai Lou Jun He Cui-Yun Lei Lin Cong Hao-Qiang Liu Xue-Feng Wang Chun ran Citrus Research Institute Southwest University/Chinese Academy of Agricultural SciencesNational Engineering Research Center for CitrusChongqingChina

diaphorina citri is a global citrus *** a vector insect,it can transmit the causative agents of citrus huanglongbing,causing irreversible losses to the citrus *** acquisition of genomic information can provide a molecular genetic basis for effective control of ***,the dNBSEQ™,Oxford Nanopore technologies,and Hi-C technologies are applied to generate a high-quality chromosome-level genome of *** genome size of *** was 523.78 Mb with a scaffold N50 of 47.05 Mb distributed on 13 chromosomes.A total of 250.64 Mb(47.85%)repeat sequences and 24048 protein-coding genes were *** resequencing of female and male individuals indicated that the sex chromosome system of *** is *** analysis demonstrated that *** and Pachypsylla venusta,which separated from their most recent common ancestor about 336.62 million years ago,were the most closely ***,we identified genes potentially involved in detoxification metabolism,pathogen transmission,and honeydew secretion for further *** high-quality genome provides an important reference for developing effective management strategies of ***.

关键词： Asian citrus psyllid chromosome-level genome comparative genomics cytochrome P450 detoxification Huanglongbing

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Migration and release potential of nitrogen at the sediment-water interface in lakes in cold and arid regions

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国际泥沙研究（英文版） 2024年第4期39卷 576-585页

作者： Mengze Li Shuhang Wang Wei Li Wenwen Wang Qi Fei Jing Gao MOE Key Laboratory of Resources and Environmental Systems Optimization College of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China National Engineering Laboratory for Lake Pollution Control and Ecological Restoration Chinese Research Academy of Environmental SciencesBeijing 100012China State Environment Protection Key Laboratory for Lake Pollution Control Chinese Research Academy of Environmental ScienceBeijing 100012China

Lake eutrophication in cold and arid regions is showing a deepening trend in recent years,posing a serious threat to the regional ecological *** occurrence characteristics,bioavailability,sorption-desorption characteristics,and release risk of sediment nitrogen in the Ulanor Wetland,located in the Hulun Lake basin of China,were investigated by combining field investigation,laboratory simu-lation experiments,and multiple technologies,including diffusive gradients in thin films and high-resolution dialysis *** total nitrogen(TN)in the water overlying the sediment bed(i.e.,overlying water)ranged from 1.44 to 2.65 mg/*** inorganic nitrogen was the main form of TN in overlying water,and ammonia nitrogen(NH4+-N)in the pore water at the sediment-water interface was higher than that in the overlying *** sediment TN content ranged from 695.37 to 2,344.77 mg/kg,with acid-dissolved nitrogen as the main component,and can cause the lowest level of ecotoxic effect The maximum and equilibrium adsorption amounts of sediment NH4+-N ranged from 0.269 to 1.017 mg/g and 0.0132-0.0382 mg/g,*** bioavailability and transport capacity of sediment nitrogen were relatively weak,but a release risk was still observed.

关键词： Cold and arid region Ulanor wetland Sediment-water interface Nitrogen migration and transformation release risk

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Effect of Proppant on Seepage and Heat Transfer Characteristics in Fractured Granite of Hot dry rock Geothermal Systems

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ENErGY SCIENCE & ENGINEErING 2025年第2期13卷 847-861页

作者： dong, Xu Wu, Yu Li, decheng Hao, Yang Geng, Haozhe China Univ Min & Technol State Key Lab Intelligent Construct & Hlth Operat Xuzhou Jiangsu Peoples R China

The seepage and heat transfer characteristics of fractured rock are critical issues in hot dry rock exploitation. This paper investigates the effects of proppant on the seepage characteristics under different conditions through seepage experiments on split granite fractures. Subsequently, seepage-heat transfer coupling mechanisms in fractured granite are elucidated through numerical simulations. The results indicate that the flow rate increases in fractures with large crack widths as temperature rises, while in fractures with small crack widths, an increase in temperature reduces the flow rate. Additionally, normal constraint force increases with rising confining pressure, consequently reducing the flow rate. Extension of seepage paths is favored by higher injection pressures, thereby improving flow rates. The inclusion of proppant effectively supports the fracture, expanding its width and significantly increasing the flow rate. Furthermore, injection into the reservoir forms a low-temperature cooling zone, which gradually advances towards the outlet over time. Initially, the outlet temperature and extract heat rate remain stable before decreasing almost linearly. Proppant filling accelerates the heat transfer rate and significantly boosts the initial extract heat rate;however, it also leads to a faster decline in reservoir heat quantity, resulting in a subsequent extract heat rate lower than that of unfilled fractures. These findings underscore the importance of balanced extract heat efficiency and enhanced geothermal system reservoir longevity for the sustained exploitation of geothermal energy.

关键词： fractured granite heat transfer proppant seepage

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Phase-field modelling for degradation/failure research in lithium battery:Progress and prospects

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Journal of Energy Chemistry 2025年第3期102卷 628-650页

作者： Wenhao Wu Ying Lin Yonggang Hu Zhifeng He Yong Yang State Key Laboratory for Physical Chemistry of Solid Surfaces Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005FujianChina College of Energy Xiamen UniversityXiamen 361005FujianChina Collaborative Innovation Center of Chemistry for Energy Materials(iChEM) Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina

degradation of materials is one of the most critical aging mechanisms affecting the performance of lithium *** the various approaches to investigate battery aging,phase-field modelling(PFM)has emerged as a widely used numerical method for simulating the evolution of the phase interface as a function of space and time during material phase transition ***,PFM coupled with multi-physics analyses is particularly well-suited for investigating the mesoscale microstructural evolution of materials,providing quantitative understandings of aging and failure mechanisms in lithium *** this paper,we comprehensively overview the state-of-art applications of PFM in the research of degradation and failure processes in lithium batteries,particularly focusing on the theoretical framework and development of the PFMs for lithium deposition/dissolution,phase separation,and crack ***,we summarize the existing challenges and prospect some future developments in PFMs,aiming to offer new insights into the advancement of PFM and ultimately enhance the development of lithium batteries.

关键词： Lithium battery Aging Numerical simulation Phase field

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