检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

多像素平衡零拍探测器研究

光学学报 2024年第5期44卷 29-35页

作者：王少锋李汉卿李康康刘鹏李娟董瑞芳山西大学物理电子工程学院山西太原030006 中国科学院国家授时中心中国科学院时间基准及应用重点实验室陕西西安710600 中国科学院大学天文与空间科学学院北京100049

平衡零拍探测技术是测量压缩态量子噪声的主要方法之一,通过光电二极管阵列和多路并行电感-电容(L-C)耦合跨阻的方式,实现了一种低噪声、高信噪比的多像素平衡零拍探测器,探测器的工作带宽为5 MHz。每一个像素通道中,光功率为1.66 mW的8... 详细信息

平衡零拍探测技术是测量压缩态量子噪声的主要方法之一,通过光电二极管阵列和多路并行电感-电容(L-C)耦合跨阻的方式,实现了一种低噪声、高信噪比的多像素平衡零拍探测器,探测器的工作带宽为5 MHz。每一个像素通道中,光功率为1.66 mW的815 nm激光入射时,散粒噪声功率在2 MHz分析频率处比电子学噪声高23 dB。当光强分布在所有像素通道时,各通道散粒噪声功率和入射光强成正比,验证了探测器可以实现多通道并行的平衡零拍探测。该探测器可实现量子光学频率梳的频谱可分辨平衡零拍探测,为量子光学频率梳在量子精密测量领域的应用提供高性能的探测工具。

关键词：探测器跨阻放大器量子光学频率梳平衡零拍探测器光电二极管阵列信噪比

同方期刊数据库

大语言模型赋能智能学伴:系统架构与风险防控

在线全文

学校读者我要写书评

暂无评论

现代远程教育研究 2024年第3期36卷 20-28页

作者：李康康卢颖翔杨现民江苏省教育信息化工程技术研究中心江苏徐州221116 江苏师范大学智慧教育学院江苏徐州221116 江苏师范大学智慧教育研究中心江苏徐州221116

大语言模型作为新一代人工智能技术的代表,因其在对话流利性、任务处理通用性和逻辑推理性方面的优势而受到教育领域从业者的广泛关注。当前智能学伴已在促进学习互动、提供个性化辅导、增进情感交流、辅助智能测评等方面进行了一定探索... 详细信息

大语言模型作为新一代人工智能技术的代表,因其在对话流利性、任务处理通用性和逻辑推理性方面的优势而受到教育领域从业者的广泛关注。当前智能学伴已在促进学习互动、提供个性化辅导、增进情感交流、辅助智能测评等方面进行了一定探索,但是仍然面临对话问答能力弱、感知性差和教学适用性低等挑战。大语言模型强大的推理和表达能力为破解这一难题提供了新的思路。大语言模型赋能智能学伴需要重点解决系统架构设计和风险防控两大问题。具体而言,大语言模型支持下的智能学伴系统架构应包括输入层、数据层、技术实现层、应用层和输出层,通过“多平台协作+智能机器人代理”的方式,实现多角色互动、强交互能力、专业教学问答与深度感知等功能。为避免技术整合过程中可能出现的数据偏见、认知误导、知识版权归属分歧、隐私泄露等风险,智能学伴系统需在数据收集、算法设计和应用实践等方面加强监管和规范,以确保数据的客观性、算法的准确性以及用户的隐私权和知识产权。未来要纵深推进智能学伴的发展,还需结合学科专业知识和教学基础理论,提升知识推理的科学性和教学的专业性。

关键词：大语言模型智能学伴生成式人工智能系统架构风险防控

Electrocatalytic CO_(2) reduction towards industrial applications

在线全文

学校读者我要写书评

暂无评论

Carbon Energy 2023年第1期5卷 154-180页

作者： Dezhi Xu kangkang li Baohua Jia Wenping Sun Wei Zhang Xue liu Tianyi Ma liaoning Province Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials Liaoning UniversityShenyangLiaoningPR China CSIRO Energy Mayfield WestNew South WalesAustralia College of Engineering Peking UniversityBeijingChina School of Science RMIT UniversityMelbourneVictoriaAustralia School of Materials Science and Engineering State Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhouZhejiangPR China

Recently,research on the electrocatalytic CO_(2) reduction reaction(eCO_(2)RR)has attracted considerable attention due to its potential to resolve environmental problems caused by CO_(2) while utilizing clean energy and producing high‐value‐added *** theoretical research in the lab has demonstrated its feasibility and ***,industrialization is mandatory to realize the economic and social value of eCO_(2)*** industrial application of eCO_(2)RR,more criteria have been proposed for eCO_(2)RR research,including high current density(above 200 mA cm^(−2)),high product selectivity(above 90%),and long‐term *** fulfill these criteria,the eCO_(2)RR system needs to be systematically designed and *** this review,recent research on eCO_(2)RR for industrial applications is *** review starts with focus on potential industrial catalysts in eCO_(2)***,potential industrial products are proposed in eCO_(2)*** products,including carbon monoxide,formic acid,ethylene,and ethanol,all have high market demand,and have shown high current density and product selectivity in theoretical ***,the innovative components and strategy for industrializing the eCO_(2)RR system are also highlighted here,including flow cells,seawater electrolytes,solid electrolytes,and a two‐step ***,some instructions and possible future avenues are presented for the prospects of future industrial application of eCO_(2)RR.

关键词： carbon dioxide reduction carbon neutral electrocatalysis industrial application

Measurement and model of density,viscosity,and hydrogen sulfide solubility in ferric chloride/trioctylmethylammonium chloride ionic liquid

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国化学工程学报:英文版 2023年第7期59卷 210-221页

作者： Zhonghao li Yuanyuan Yang Huanong Cheng Yun Teng Chao li kangkang li Zhou Feng Hongwei Jin Xinshun Tan Shiqing Zheng College of Chemical Engineering Qingdao University of Science and TechnologyQingdao 266042China

The density and viscosity of ferric chloride/trioctylmethylammonium chloride ionic liquid(rFeCl_(3)/[A336]Cl)with different molar ratios(r=0.1-0.8)of FeCl_(3) to[A336]Cl were measured at temperatures from 313.15 to 358.15 K and atmospheric *** density and viscosity data were fitted by the relevant temperature variation equations,*** variation of density and viscosity with temperature and r was *** solubility of rFeCl_(3)/[A336]Cl to H_2S was measured at temperatures from 318.15 to 348.15 K and pressures from 0 to 150 *** effects of temperature,pressure,and r on the solubility of H_(2)S were *** reaction equilibrium thermodynamic model(RETM)was used to fit the H_(2)S solubility data,and the average relative error was less than 1.3%,indicating that the model can relate the solubility data *** Henry's constant and chemical reaction equilibrium constant were obtained by the RETM *** relationships of Henry's constant and chemical reaction equilibrium constant with temperature and r were analyzed.

关键词： Ionic liquids Hydrogen sulfide Solubility Henry's constant Chemical reaction equilibrium constant Model

Thermal Hall conductivity with sign change in the Heisenberg–Kitaev kagome magnet

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2023年第1期75卷 154-161页

作者： kangkang li Department of Physics Zhejiang Normal UniversityJinhua 321004China

The Heisenberg-Kitaev(HK)model on various lattices has attracted a lot of attention because it may lead to exotic states such as quantum spin liquid and topological *** rare-earth-based kagome lattice(KL)compounds Mg_(2)RE_(3)Sb_(3)O_(14)(RE=Gd,Er)and(RE=Nd)have q=0,120°order and canted ferromagnetic(CFM)order,***,the HK model on the KL has the same ground state long-range *** the theoretical phase diagram,the CFM phase resides in a continuous parameter region and there is no phase change across special parameter points,such as the Kitaev ferromagnetic(KFM)point,the ferromagnetic(FM)point and its dual FM ***,a ground state property cannot distinguish a system with or without topological nontrivial excitations and related phase ***,we study the topological magnon excitations and related thermal Hall conductivity in the HK model on the KL with CFM *** CFM phase can be divided into two regions related by the Klein duality,with the self dual KFM point as their *** find that the scalar spin chirality,which is intrinsic in the CFM order,changes sign across the KFM *** leads to the opposite Chem numbers of corresponding magnon bands in the two regions,and also the sign change of the magnon thermal Hall conductivity.

关键词： canted ferromagnetic order topological magnon thermal Hall conductivity sign change Heisenberg–Kitaev kagome magnet

Hierarchical dimensional crossover of an optically-trapped quantum gas with disorder

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2022年第12期74卷 138-145页

作者： kangkang li Zhaoxin liang Department of Physics Zhejiang Normal UniversityJinhua 321004China

Dimensionality serves as an indispensable ingredient in any attempt to formulate low-dimensional physics,and studying the dimensional crossover at a fundamental level is *** purpose of this work is to study the hierarchical dimensional crossovers,namely the crossover from three dimensions(3D)to quasi-2D and then to *** system consists of a 3D Bose–Einstein condensate trapped in an anisotropic 2D optical lattice characterized by the lattice depths V1 along the x direction and V2 along the y direction,respectively,where the hierarchical dimensional crossover is controlled via V1 and *** analytically derive the ground-state energy,quantum depletion and the superfluid density of the *** results demonstrate the 3D-quasi-2D-1D dimensional crossovers in the behavior of quantum *** for possible experimental realization of our scenario are also discussed.

关键词： ultracold quantum gas Bogoliubov theory dimensional crossover quantum depletion

Relationship between the rise and fall of Loulan ancient city and centennial-scale climate events and cycles

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2023年第4期17卷 1070-1080页

作者： Deke XU Chang li Yingyu JIN Zhenhua DENG Bing XU kangkang li Jianping ZHANG Xiaohong SUN Jing FENG Yingxin JIAO Hao li Xiaoguang QIN Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Institute of Earth Science Chinese Academy of SciencesBeijing 100029China School of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China Beijing Jianhua Experimental Yizhuang School Beijing 100176China School of Archaeology and Museology Peking UniversityBeijing 100871China Geological Research Institute of China Chemical Geology and Mine Bureau Beijing 100013China Loulan Museum of Ruoqiang County Bayingol Mongolian Autonomous PrefectureXinjiang 841800China

The discovery of Loulan ancient city(LA)in the early 20th century has important significance for understanding the history of Western regions and the Silk Road *** current academic community still has disputes on whether LA was the capital of Loulan Kingdom,the time of its rise,peak and decline,and the process,rate and driving mechanism of human activity *** study uses the radio carbon dates(^(14)C)database of LA to reconstruct the history of the rise and fall of human activity,and finds that LA experienced more than~500 years from its rise to its peak and then to its decline:1)the city rose rapidly,and the population increased rapidly from~A.D.0 to 230;2)the city was prosperous and flourishing,and the intensity of human activity reached its peak from~A.D.160 to 340,especially in~A.D.230,when the population reached its peak;3)the city accelerated its decline,and the intensity of human activity decreased significantly,and the population shrank rapidly from~A.D.230 to 500;4)LA was completely abandoned after~*** results of the ^(14)C dating database do not support that LA was the early capital of the Loulan *** comparing the human activity record of LA with the existing high-resolution palaeoclimate records in the surrounding mountainous areas of the Tarim Basin and South Asia,it is found that the superposition of centennial-scale westerly circulation strength events and the~500-year cycle of the Indian monsoon jointly controlled the precipitation and meltwater(snow)supply of the mountains in the Tarim Basin,affecting the changes of surface runoff and oasis area in the basin,which is one of the important factors causing the rise and fall of LA.

关键词： ^(14)C probability density time series analysis ~500-year cycle Indian monsoon westerly circulation

Dimensional crossover of a Rabi-coupled two-component Bose–Einstein condensate in an optical lattice

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2023年第1期75卷 147-153页

作者： kangkang li Zhaoxin liang Department of Physics Zhejiang Normal UniversityJinhua 321004China

Dimensionality is a central concept in developing the theory of low-dimensional ***,previous research on dimensional crossover in the context of a Bose-Einstein condensate(BEC)has focused on the single-component *** our best knowledge,further consideration of the two-component internal degrees of freedom on the effects of dimensional crossover is still *** this work,we are motivated to investigate the dimensional crossover in a three-dimensional(3D)Rabi-coupled two-component *** spin degrees of freedom consist of the Rabi-like and inter-and intra-interaction coupling *** dimensional crossovers from 3D to 2D or 1D are controlled by the continuous increase of 1D or 2D lattice depth *** we analyze how the dimensionality of the model system combined with spin degrees of freedom can affect quantum ***,the analytical expressions of the ground-state energy and quantum depletion of the system are *** results show that the dimensional crossover induces a characteristic 3D to quasi-2D or 1D crossover in the behavior of quantum fluctuations,with an emphasis on the separated effects of Rabi-like and inter-and intra-interaction coupling constants on the quantum *** for possible experimental realization of our scenario are also discussed.

关键词： two-component Bose gas dimensional crossover Bogoliubov theroy quantum fluctuation optical lattice

Topological Magnons in Kitaev Magnets with Finite Dzyaloshinskii–Moriya Interaction at High Field

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2023年第2期40卷 55-59页

作者：厉康康 Department of Physics Zhejiang Normal UniversityJinhua 321004China

There have been intensive studies on Kitaev materials for the sake of realization of exotic states such as quantum spin liquid and topological *** realistic materials,the Kitaev interaction may coexist with the Dzyaloshinskii–Moriya interaction,and it is of challenge to distinguish their magnitudes ***,we study the topological magnon excitations and related thermal Hall conductivity of kagome magnet exhibiting Heisenberg,Kitaev and Dzyaloshinskii–Moriya interactions exposed to a magnetic *** a strong magnetic field perpendicular to the plane of the lattice([111]direction)that brings the system into a fully polarized paramagnetic phase,we find that the magnon bands carry nontrivial Chern numbers in the full region of the phase ***,there are phase transitions related to two topological phases with opposite Chern numbers,which lead to the sign changes of the thermal Hall *** the phase with negative thermal conductivity,the Kitaev interaction is relatively large and the width of the phase increases with the strength of Dzyaloshinskii–Moriya ***,the present study will contribute to the understanding of related compounds.

关键词： interaction field topological