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非线性能量采集的工业物联网非线性信息年龄分析

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计算机工程 2024年第8期50卷 198-206页

作者：许晋贾向东韩向花张兴元西北师范大学计算机科学与工程学院甘肃兰州730070 南京邮电大学江苏省无线通信重点实验室江苏南京210003

针对工业物联网(IIoT)中对信息新鲜性日益增长的需求,提出一种基于非线性能量采集(EH)的IIoT监控系统,配备电池容量大小为B的传感器节点,从无线供电基站(WPS)使用非线性EH技术采集射频(RF)能量进行充电,电池充满后将采集到的数据发送给... 详细信息

针对工业物联网(IIoT)中对信息新鲜性日益增长的需求,提出一种基于非线性能量采集(EH)的IIoT监控系统,配备电池容量大小为B的传感器节点,从无线供电基站(WPS)使用非线性EH技术采集射频(RF)能量进行充电,电池充满后将采集到的数据发送给数据采集节点。此外,针对在复杂场景中需要设置多个非线性信息年龄(AoI)算法所存在系统较为复杂的问题,提出1个普适函数来描述不同的非线性AoI,并通过调节参数来控制函数图像形状。在推导系统非线性AoI封闭表达式的同时引入系统能量效率(EE),以两者的比值Ψ作为系统的性能指标。鉴于问题较为复杂,采用一维搜索方法来寻找最优电池容量。通过系统仿真和数值分析,证明了存在最优的电池容量B使系统Ψ最小化。仿真结果表明,信道衰落参数、状态更新大小、WPS发射功率等参数都会对系统的性能产生影响,在相关系统的优化设计时都需要考虑。当WPS发射功率为0.5 W时,指数型非线性AoI下的Ψ是对数型非线性的2倍,是线性的1.8倍。

关键词：工业物联网非线性能量采集传输正确概率非线性信息年龄能量效率

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Terahertz bound states in the continuum with incident angle robustness induced by a dual period metagrating

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Photonics Research 2022年第3期10卷 810-819页

作者： Wenqiao Shi Jianqiang Gu xingyuan zhang Quan Xu Jiaguang Han Quanlong Yang Longqing Cong Weili zhang Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Tianjin Universityand Key Laboratory of Optoelectronics Information and TechnologyMinistry of EducationTianjin 300072China Nonlinear Physics Centre Australian National UniversityCanberraACT 2601Australia Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China School of Electrical and Computer Engineering Oklahoma State UniversityStillwaterOklahoma 74078USA

Metasurface-empowered bound state in the continuum(BIC)provides a unique route for fascinating functional devices with infinitely high quality *** method is particularly attractive to the terahertz community because it may essentially solve the deficiencies in terahertz filters,sensors,lasers,and nonlinear ***,most BIC metasurfaces are limited to specified incident angles that seriously dim their application ***,we propose that a dual-period dielectric metagrating can support multiple families of BICs that originate from guided mode resonances in the dielectric grating and exhibit infinite quality factors at arbitrarily tilted *** robustness was analyzed based on the Bloch theory and verified at tilted incident *** also demonstrate that inducing geometric asymmetry is an efficient way to manipulate the leakage and coupling of these BICs,which can mimic the electromagnetically induced transparency(EIT)effect in our dual-period *** this demonstration,a slow-light effect with a measured group delay of 117 ps was *** incidence-insensitive BICs proposed here may greatly extend the application scenarios of the BIC *** high Q factor and outstanding slow-light effect in the metagrating show exciting prospects in realizing high-performance filters,sensors,and modulators for prompting terahertz applications.

关键词： incident dielectric continuum

政策主题视角下我国政府数据治理政策演进研究

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情报探索 2024年第5期 87-95页

作者：吴涵肖明郭珺曜张星渊徐卓琪国家方志馆北京100021 北京师范大学政府管理学院北京100875

[目的/意义]我国政府数据治理框架处于不断的发展过程之中,分析数据治理的政策主题的演进与变迁,能够梳理政策发展脉络,指导数据治理政策体系的发展与完善。[方法/过程]系统收集中央层面政府数据治理政策,建构发展阶段,并借助LDA主题模... 详细信息

[目的/意义]我国政府数据治理框架处于不断的发展过程之中,分析数据治理的政策主题的演进与变迁,能够梳理政策发展脉络,指导数据治理政策体系的发展与完善。[方法/过程]系统收集中央层面政府数据治理政策,建构发展阶段,并借助LDA主题模型提取各阶段的重点主题,分析我国政府数据治理政策关注重点的演变与各阶段特征。[结果/结论]我国政府数据治理政策沿着“发展环境酝酿—政府数据价值释放—社会数据化转型”的路径不断演变发展,覆盖范围逐渐从政府内部拓宽至全社会,作用机制逐渐从政府主导转向鼓励市场发展,作用环节逐渐从数据收集、组织扩散至开发、利用等数据生命周期各环节,但数据安全问题始终是关注重点。

关键词：数据治理 LDA主题模型文本挖掘政策演进

自拟消疣汤治疗扁平疣的临床疗效及对相关免疫因子水平的影响

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中国民间疗法 2024年第6期32卷 58-61页

作者：马成张兴元刘炜明陈焕新甘肃省徽县人民医院甘肃陇南742300

目的:观察自拟消疣汤治疗扁平疣的临床疗效及对相关免疫因子水平的影响。方法:将66例扁平疣患者随机分为对照组和观察组,每组33例。对照组给予维A酸乳膏外涂治疗,观察组给予消疣汤治疗,治疗14d后评定疗效,比较两组患者治疗前后皮损数量... 详细信息

目的:观察自拟消疣汤治疗扁平疣的临床疗效及对相关免疫因子水平的影响。方法:将66例扁平疣患者随机分为对照组和观察组,每组33例。对照组给予维A酸乳膏外涂治疗,观察组给予消疣汤治疗,治疗14d后评定疗效,比较两组患者治疗前后皮损数量、大小、颜色、瘙痒程度积分和血清免疫球蛋白G(IgG)、免疫球蛋白M(IgM)及白细胞介素-4(IL-4)水平,以及随访1、3、6个月复发情况。结果:观察组总有效率为96.97%(32/33),高于对照组的72.73%(24/33),差异具有统计学意义(P<0.05)。治疗后,两组患者皮损数量、大小、颜色、瘙痒程度积分均较治疗前降低,且观察组均低于对照组,差异均有统计学意义(P<0.05)。治疗后,两组患者IgG、IgM水平均较治疗前升高,IL-4水平较治疗前降低,差异均有统计学意义(P<0.05);两组患者IgG、IgM、IL-4水平组间比较,差异均有统计学意义(P<0.05)。治疗后随访1、3、6个月,观察组复发率均低于对照组,差异均有统计学意义(P<0.05)。结论:自拟消疣汤治疗扁平疣对皮损具有显著效果,可改善炎症因子水平,降低复发率。

关键词：消疣汤扁平疣皮损积分免疫球蛋白白细胞介素-4

Regularly Tuning Quantum Interference in Single-Molecule Junctions through Systematic Substitution of Side Groups with Varied Electron Effects

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Chinese Journal of Chemistry 2024年第11期42卷 1217-1222页

作者： Xianjing Xie Yirong zhang Junrui zhang xingyuan Cui Wei Liu Xunshan Liu Key Laboratory of Surface&Interface Science of Polymer Materials of Zhejiang Province School of Chemistry and Chemical EngineeringZhejiang Sci-Tech University928 Second StreetHangzhouZhejiang310018 China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunJilin130022 China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjingJiangsu210094 China

Investigating the quantum interference effect in single molecules is essential to comprehensively understand the underlying mechanism of single-molecule charge *** this study,we employed the mother molecule m-OPE and introduced a series of side groups with various electronic effects at the 2-position of the central phenyl ring,creating four daughter m-OPE *** single molecular conductivities of these molecule wires were measured using the scanning tunneling microscope breaking junction *** findings demonstrate that the substitutions regularly modulate the destructive quantum interference occurring within the m-OPE *** combining optical and electrochemical investigations,along with density functional theory computations,we discover that the conductivity of the molecules corresponds to the electron-donating/withdrawing ability of the ***,by adjusting the electron structures of the molecular backbone,we can systematically tailor the destructive quantum interference in the m-OPE molecules.

关键词： Quantum interference Single-molecule junctions Electron effect substituents Charge transport Molecular devices

Lithological Facies Classification Using Attention-Based Gated Recurrent Unit

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Tsinghua Science and Technology 2024年第4期29卷 1206-1218页

作者： Yuwen Liu Yulan zhang xingyuan Mao Xucheng Zhou Jingwen Chang Wenwei Wang Pan Wang Lianyong Qi College of Computer Science and Technology China University of Petroleum(East China)Qingdao 266580China Shandong Provincial University Laboratory for Protected Horticulture Weifang University of Science and TechnologyShouguang 262700China School of Mechanical Electrical and Information EngineeringShandong UniversityWeihai 264209China Shandong Provincial Key Laboratory of Network Based Intelligent Computing University of JinanJinan 250022China School of Modern Posts Nanjing University of Posts and TelecommunicationsNanjing 210023China

Lithological facies classification is a pivotal task in petroleum geology, underpinning reservoir characterization and influencing decision-making in exploration and production operations. Traditional classification methods, such as support vector machines and Gaussian process classifiers, often struggle with the complexity and nonlinearity of geological data, leading to suboptimal performance. Moreover, numerous prevalent approaches fail to adequately consider the inherent dependencies in the sequence of measurements from adjacent depths in a well. A novel approach leveraging an attention-based gated recurrent unit (AGRU) model is introduced in this paper to address these challenges. The AGRU model excels by exploiting the sequential nature of well-log data and capturing long-range dependencies through an attention mechanism. This model enables a flexible and context-dependent weighting of different parts of the sequence, enhancing the discernment of key features for classification. The proposed method was validated on two publicly available datasets. Results demonstrate a considerably improvement over traditional methods. Specifically, the AGRU model achieved superior performance metrics considering precision, recall, and F1-score.

关键词： attention mechanism facies classification GRU MLP(multilayer perceptron)

Single-shot phase retrieval for randomly fluctuated and obstructed vortex beams

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Science China(Physics,Mechanics & Astronomy) 2024年第4期67卷 72-80页

作者： Hao zhang Jun’an Zhu xingyuan Lu Zhiquan Hu Jianbo Gao Kun Liu Qiwen Zhan Yangjian Cai Chengliang Zhao School of Physical Science and Technology Soochow UniversitySuzhou 215006China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shandong Provincial Engineering and Technical Center of Light Manipulations Shandong Provincial Key Laboratory of Optics and Photonic DeviceSchool of Physics and ElectronicsShandong Normal UniversityJinan 250358China Joint Research Center of Light Manipulation Science and Photonic Integrated Chip of East China Normal University and Shandong Normal University East China Normal UniversityShanghai 200241China

Vortex beams with orbital angular momentum play a crucial role in increasing the information capacity in optical *** magnitude of orbital angular momentum determines the ability of information *** practice,a vortex beam can encounter random objects or turbulence during free-space propagation,resulting in information ***,accurately measuring the orbital angular momentum of a randomly fluctuated and obstructed vortex beam is a considerable ***,we propose a single-shot method for the phase retrieval of a randomly fluctuated and obstructed vortex beam by combining the phase-shift theorem and self-reference *** results reveal that the sign and magnitude of the initial orbital angular momentum can be simultaneously determined based on their quantitative relation with the number of coherence singularities on the observation plane,thus addressing the effects of random occlusion and atmospheric *** proposed method considerably improved the accurate decoding of orbital angular momentum information in nonideal freespace optical communications.

关键词： optical vortex phase retrieve orbital angular momentum measurement antiturbulence antidisturbance

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Macroporous-mesoporous C-,S-,N-doped titania microspheres via the polyHIPE microspheres templates

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Chinese Chemical Letters 2021年第3期32卷 1135-1138页

作者： Xiaoling Cui Huarong Liu xingyuan zhang Hewen Liu CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China

Doping and increasing specific surface area by forming highly porous structures are two effective ways to enhance the photocatalytic performances of TiO_(2) *** re for the first time,we report a new facile method to prepare the macroporous-mesoporous C-,S-,N-doped TiO_(2)(C/S/N-TiO_(2))microspheres via polyHIPE microsphe res as *** chemical and crystalline structure s of these hierarchical porous TiO_(2) microspheres are analyzed with FTIR,XPS,EDS,and *** macroporous-mesoporous structures are confirmed with SEM observation and BET ***-vis DRS spectra analysis shows that the band gaps of C doped TiO_(2),C/N doped TiO_(2),C/S doped TiO_(2) and C/S/N doped TiO_(2) are estimated to be 3.07,3.01,2.94 and 2.81 eV,respectively,which are significantly narrower than that of TiO_(2) nanoparticles(3.23 eV).Photoluminescence spectra demonstrate that the recombination of electrons and holes in these macroporous-mesoporous TiO_(2) microspheres is also *** hierarchical porous C/S/N-TiO_(2) microspheres show high visible-light catalytic efficiency and excellent cycling stability to degrade RhB dye.

关键词： Porous titania microspheres PolyHIPE microspheres Hierarchical porous structure Heteroatom doping Photocatalysis

Rail fastener defect inspection method for multi railways based on machine vision

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Railway Sciences 2022年第2期1卷 210-223页

作者： Junbo Liu YaPing Huang ShengChun Wang XinXin Zhao Qi Zou xingyuan zhang Infrastructure Inspection Research Institute China Academy of Railway Sciences Corporation LimitedBeijingChina Beijing Key Laboratory of Traffic Data Analysis and Mining Beijing Jiaotong UniversityBeijingChina Beijing R&D Centre Huawei Technologies Co LtdShenzhenChina

Purpose–This research aims to improve the performance of rail fastener defect inspection method for multi railways,to effectively ensure the safety of railway ***/methodology/approach–Firstly,a fastener region location method based on online learning strategy was proposed,which can locate fastener regions according to the prior knowledge of track image and template matching *** learning strategy is used to update the template library dynamically,so that the method not only can locate fastener regions in the track images of multi railways,but also can automatically collect and annotate fastener ***,a fastener defect recognition method based on deep convolutional neural network was *** structure of recognition network was designed according to the smaller size and the relatively single content of the fastener *** data augmentation method based on the sample random sorting strategy is adopted to reduce the impact of the imbalance of sample size on recognition ***–Test verification of the proposed method is conducted based on the rail fastener datasets of multi ***,fastener location module has achieved an average detection rate of 99.36%,and fastener defect recognition module has achieved an average precision of 96.82%.Originality/value–The proposed method can accurately locate fastener regions and identify fastener defect in the track images of different railways,which has high reliability and strong adaptability to multi railways.

关键词： Rail fastener Defects inspection Multi railways Image recognition Deep convolutional neural network Machine vision