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河北法律职业教育

河北法律职业教育 2024年第10期2卷 117-122页

作者：韦文强山东科技大学文法学院

随着数字技术的发展,算法推荐在网络服务平台中得到广泛应用,提高了用户体验和平台收益。但是,算法推荐的应用也加大版权侵权的潜在风险,给“通知—删除”规则的适用带来了诸多难题,算法推荐技术客观上提升了侵权行为发生风险,超出了现... 详细信息

随着数字技术的发展,算法推荐在网络服务平台中得到广泛应用,提高了用户体验和平台收益。但是,算法推荐的应用也加大版权侵权的潜在风险,给“通知—删除”规则的适用带来了诸多难题,算法推荐技术客观上提升了侵权行为发生风险,超出了现行版权保护规则,导致事后的版权责任已经无法有力保护版权。在算法时代,平台应当重新认定自身的版权责任,引入版权过滤机制,结合算法运用领域的特殊性合理认定版权注意义务,构建新的版权责任体系。

关键词：算法推荐注意义务版权过滤

高电荷态类硼离子^(2)P_(3/2)—^(2)P_(1/2)跃迁的实验和理论研究进展

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物理学报 2024年第20期73卷 22-35页

作者：刘鑫汶伟强李冀光魏宝仁肖君复旦大学现代物理研究所核物理与离子束应用教育部重点实验室上海200433 中国科学院近代物理研究所兰州730000 北京应用物理与计算数学研究所北京100088

高电荷态离子(highly charged ion,HCI)的精细结构及辐射跃迁性质的精确测量不仅可以检验基本物理模型,包括:强场量子电动力学(quantum electrodynamics,QED)效应、电子关联效应、相对论效应、原子核效应等,而且能够为天体物理和聚变等... 详细信息

高电荷态离子(highly charged ion,HCI)的精细结构及辐射跃迁性质的精确测量不仅可以检验基本物理模型,包括:强场量子电动力学(quantum electrodynamics,QED)效应、电子关联效应、相对论效应、原子核效应等,而且能够为天体物理和聚变等离子体物理提供关键原子物理参数.相对于研究较多的类氢和类锂离子体系,类硼离子的精细结构禁戒跃迁的相对论效应和QED效应的贡献很大,高精度实验测量与理论计算为进一步检验多电子体系的基本物理模型提供了重要途径.此外,类硼离子也被认为是最佳的高电荷态离子光钟候选体系.本文主要介绍了类硼离子基态^(2)P_(3/2)—^(2)P_(1/2)跃迁的实验和理论研究最新进展,概述了其精细结构和超精细结构的研究现状,并讨论了使用电子束离子阱结合高分辨光谱学实验技术开展类硼离子超精细分裂实验测量的方案,为未来开展类硼离子超精细分裂实验研究并在更高精度上检验QED效应,提取原子核磁化分布半径,检验相关的核结构模型等研究提供了参考.

关键词：高电荷态离子超精细结构量子电动力学高电荷态离子光钟

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丰水城乡接合区流域治理方案:以武汉东西湖区为例

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中国给水排水 2024年第16期40卷 37-41页

作者：范乐毛毅石亚军杨昱昊位文强童阳魏征武汉市政工程设计研究院有限责任公司湖北武汉430023 武汉市海绵城市和综合管廊建设管理站湖北武汉430023

传统水环境治理存在局部化、零散化、线性化、治理效果反复等系列问题,特别是丰水型城乡接合区域,水环境问题更为复杂,具有范围广、种类多、数量大、分散性强等特点。以武汉市东西湖区为研究对象,以系统化流域治理的理念,综合统筹岸上... 详细信息

传统水环境治理存在局部化、零散化、线性化、治理效果反复等系列问题,特别是丰水型城乡接合区域,水环境问题更为复杂,具有范围广、种类多、数量大、分散性强等特点。以武汉市东西湖区为研究对象,以系统化流域治理的理念,综合统筹岸上、水下和上下游的关系,重点从水安全、水环境、水生态三个方面,针对丰水型城市不同开发建设态势下面临的新型水问题,以问题和需求为导向,提出有侧重的治理思路和体系,经过系列工程落地实施,规划区内地表水劣Ⅴ类水质的湖泊全部消除,达到Ⅲ类标准的有5个,Ⅳ类标准的有10个,流域系统治理成效显著,可为同类型城市流域水环境治理提供参考。

关键词：流域系统治理丰水型城乡结合区水环境治理

Influence of Laser Wavelength on Laser-induced Breakdown Spectroscopy Applied to Semi-Quantitative Analysis of Trace-Elements in a Plant Sample

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Chinese Physics Letters 2010年第6期27卷 85-88页

作者： ZHANG Da-Cheng MA Xin-wen wen wei-qiang ZHANG Peng-Ju ZHU Xiao-Long LI Bin LIU Hui-Ping Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 Graduate University of Chinese Academy of Sciences Beijing 100049

Laser-induced breakdown spectroscopy （LIBS） as a powerful analytical technique is applied to analyze trace- elements in fresh plant samples. We investigate the LIBS spectra of fresh holly leaves and observe more than 430 lines emitted from 25 elements and molecules in the region 230-438nm. The influence of laser wavelength on LIBS applied to semi-quantitative analysis of trace-element contents in plant samples is studied. The results show that the UV laser has lower relative standard deviations and better repeatability for semi-quantitative analysis of trace-element contents in plant samples. This work may be helpful for improving the quantitative analysis power of LIBS applied to plant samples.

关键词： Energy sources Lasers Plants Planting Sampling Trace elements Quantitative analysis Elements

重离子储存环CSRe上类钠Kr^(25+)离子的双电子复合精密谱学实验研究

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物理学报 2024年第12期73卷 147-158页

作者：邵林黄忠魁汶伟强汪书兴黄厚科马万路刘畅汪寒冰陈冬阳刘鑫周晓鹏赵冬梅张少锋朱林繁马新文华南师范大学物理学院量子调控工程与材料重点实验室广州510006 中国科学院近代物理研究所兰州730000 中国科学技术大学近代物理系合肥230026

高电荷态离子的双电子复合精密谱学实验研究,不仅对天体等离子体和聚变等离子体的研究具有重要意义,而且可以作为一种新的精密谱学工具,用来检验强场量子电动力学效应、测量同位素移动及提取原子核电荷半径等.在兰州重离子储存环CSRe上... 详细信息

高电荷态离子的双电子复合精密谱学实验研究,不仅对天体等离子体和聚变等离子体的研究具有重要意义,而且可以作为一种新的精密谱学工具,用来检验强场量子电动力学效应、测量同位素移动及提取原子核电荷半径等.在兰州重离子储存环CSRe上,安装了专门用于电子-离子复合精密谱学实验的电子束能量调制系统,质心系下电子-离子碰撞能量的调制范围达到0—1 keV.在CSRe电子冷却器下游安装了自主研制的塑料闪烁体探测器和多丝正比探测器,用于探测复合离子.在此基础上,使用Kr^(25+)离子在CSRe上进行了首次双电子复合测试实验,实验测量了质心系能量0—70 eV的双电子复合速率系数.为了更好地理解实验测量结果,利用FAC(flexible atomic code)程序计算了Kr^(25+)离子的双电子复合速率系数,并与实验做了细致对比,整体符合很好,而且发现3s→41(△n=1)的共振跃迁对实验谱线有很大的贡献.实验结果表明,CSRe双电子复合实验平台具有非常好的稳定性和可重复性,能够为下一步开展更高电荷态离子的双电子复合精密谱学实验、检验强场量子电动力学效应以及原子核性质精密测量等前沿实验提供支持.

关键词：双电子复合储存环CSRe 电子冷却器多丝正比探测器

稀土合金化高碳耐磨钢连续冷却转变曲线的建立及组织转变

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包钢科技 2024年第2期50卷 22-27页

作者：王权刘朋成朱辉魏文强高思远内蒙古中天宏远稀土新材料股份公司内蒙古包头014010 内蒙古包钢钢联股份有限公司技术中心内蒙古包头014010

采用金相显微镜、场发射扫描电镜和淬火膨胀仪研究稀土合金化高碳耐磨钢不同冷却速度条件下的转变组织、相变临界点和不同冷却速度下过冷奥氏体的连续冷却转变曲线(CCT曲线)。结果表明:相变临界点为Ac_(1)为742.6℃,Ac_(3)为816.5℃,Ms... 详细信息

采用金相显微镜、场发射扫描电镜和淬火膨胀仪研究稀土合金化高碳耐磨钢不同冷却速度条件下的转变组织、相变临界点和不同冷却速度下过冷奥氏体的连续冷却转变曲线(CCT曲线)。结果表明:相变临界点为Ac_(1)为742.6℃,Ac_(3)为816.5℃,Ms为307.0℃。当冷却速度小于0.4℃/s时,显微组织为少量铁素体+珠光体;当冷却速度为0.4℃/s时,显微组织为单相伪共析珠光体;当冷却速度大于0.5℃/s时,显微组织逐渐向马氏体转变;冷却速度高于4℃/s时,钢中仅有马氏体+残余奥氏体组织。

关键词：稀土合金化高碳耐磨钢 CCT曲线组织转变

PVP/PAN-derived porous carbon fiber for zinc-ion hybrid supercapacitors

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Rare Metals 2024年第7期43卷 3066-3073页

作者： Shu-Hua Yang wen-Qing Fu Yan-wei Cui Bing-qiang Cao Materials Center for Energy and Photoelectrochemical Conversion School of Material Science and EngineeringUniversity of JinanJinan 250022China

Porous carbon fibers are promising cathodes for zinc-ion hybrid supercapacitors(ZHSs)owing to their abundant active sites,great conductivity,and stable physical and chemical ***,designing a proper preparation technique to regulate the microstructure of carbon fibers still remains a great ***,a poly vinylpyrrolidone/po-lyacry lonitrile(PVP/PAN)-derived porous carbon fiber is developed via the PVP/PAN blend electrospinning and hydrothermal selective PVP removal *** hydrothermal selective PVP removal strategy can effectively avoid a cross-linking between PVP and PAN during the traditional stabilization at air *** PVP/PAN-derived porous carbon fiber,the sufficient micropores provide abundant space for the Zn^(2+)storage,whereas the proper mesopores contribute to the fast ion *** hierarchical porous structures endow ZHSs with high specific capacity and high-rate *** ZHS assembled with the optimal PVP/PAN-derived porous carbon fiber(PVP-PANC-0.8)displays an outstanding specific capacity of 208 mAh·g^(-1),high rate capability(49.5%)from 0.5 to 5 A·g^(-1),and 72.25%capacity retention after 10,000 cycles at 0.5 A·g^(-1).

关键词： Zinc-ion hybrid supercapacitors Porous carbon fibers Hierarchical porous structures Electrospinning

Emergent symmetry in quantum phase transition:From deconfined quantum critical point to gapless quantum spin liquid

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Science Bulletin 2024年第2期69卷 190-196页

作者： wen-Yuan Liu Shou-Shu Gong wei-qiang Chen Zheng-Cheng Gu Department of Physics The Chinese University of Hong KongHong KongChina Division of Chemistry and Chemical Engineering California Institute of TechnologyPasadena CA 91125USA School of Physical Sciences Great Bay UniversityDongguan 523000China Great Bay Institute for Advanced Study Dongguan 523000China Department of Physics and Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices Southern University of Science and TechnologyShenzhen 518055China

The emergence of exotic quantum phenomena in frustrated magnets is rapidly driving the development of quantum many-body physics,raising fundamental questions on the nature of quantum phase *** we unveil the behaviour of emergent symmetry involving two extraordinarily representative phenomena,i.e.,the deconfined quantum critical point(DQCP)and the quantum spin liquid(QSL)*** large-scale tensor network simulations,we study a spatially anisotropic spin-1/2 square-lattice frustrated antiferromagnetic(AFM)model,namely the J1x-J1y-J2 model,which contains anisotropic nearestneighbor couplings J1x,J1y and the next nearest neighbor coupling *** small J1y/J1x,by tuning J2,a direct continuous transition between the AFM and valence bond solid phase is *** growing J1y/J1x,a gapless QSL phase gradually emerges between the AFM and VBS *** observe an emergent O(4)symmetry along the AFM–VBS transition line,which is consistent with the prediction of DQCP *** surprisingly,we find that such an emergent O(4)symmetry holds for the whole QSL–VBS transition line as *** findings reveal the intrinsic relationship between the QSL and DQCP from categorical symmetry point of view,and strongly constrain the quantum field theory description of the QSL *** phase diagram and critical exponents presented in this paper are of direct relevance to future experiments on frustrated magnets and cold atom systems.

关键词： Tensor network Quantum phase transition Emergent symmetry Quantum spin liquid Deconfined quantum critical point Anisotropic

Superatom-assembled boranes,carboranes,and low-dimensional boron nanomaterials based on aromatic icosahedral B_(12)and C_(2)B_(10)

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Nano Research 2024年第7期17卷 6734-6740页

作者： Qiao-Qiao Yan Yan-Fang wei qiang Chen Yue-wen Mu Si-Dian Li Institute of Molecular Science Shanxi UniversityTaiyuan 030006China

Using the experimentally known aromatic icosahedral superatoms I_(h)B_(12)H_(12)2−and D_(5d)1,12-C_(2)B_(10)H_(12)as building blocks and based on extensive density functional theory calculations,we predict herein a series of core–shell superpolyhedral boranes and carboranes in a bottom-up approach,including the high-symmetry Th B_(12)@B_(152)H_(72)2−(2),C2h C_(2)B_(10)@B_(152)H_(72)(3),D_(3d)B_(12)@B_(144)H_(66)(4),I_(h)B_(12)@C_(24)B_(12)0H_(72)2−(6),and D_(5d)C_(2)B_(10)@C_(24)B_(12)0H_(72)(7).More interestingly,the superatom-assembled linear D2h B_(36)H_(32)^(2−)(8),close-packed planar D_(3d)B_(84)H_(60)^(2−)(10),and nearly close-packed core−shell D_(3d)B_(12)@B144H_(6)6(4)can be extended periodically to form the one-dimensional(1D)α-rhombohedral borane nanowire B_(12)H_(10)(Pmmm)(9),two-dimensional(2D)α-rhombohedral monolayer borophane B_(12)H_(6)(P m1)(11),and the experimentally known three-dimensional(3D)α-rhombohedral boron(R m)(12)which can be viewed as an assembly of the monolayer B_(12)H_(6)(11)staggered in vertical direction,setting up a bottom-up strategy to form low-dimensional boron-based nanomaterials from their borane“seeds”via partial or complete *** bonding analyses indicate that the high stability of these nanostructures originates from the spherical aromaticity of their icosahedral B_(12)or C_(2)B_(10)structural units which possess the universal skeleton electronic configuration of 1S21P61D101F8 following the Wade’s n+1 *** infrared(IR)and Raman spectra of the most-concerned neutral B_(12)@B144H_(6)6(4)and C_(2)B_(10)@C_(24)B_(12)0H_(72)(7)are computationally simulated to facilitate their experimental characterizations.

关键词： superatom-assembling bottom-up approach density functional theory superpolyhedral boranes superpolyhedral carboranes borophanes