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河南警察学院学报 2019年第3期28卷 14-23页

作者：叶栩闻李文斌丽水市公安局莲都区分局

"枫桥经验"是新时期推进社会治安综合治理,实现国家长治久安必须始终坚持和大力弘扬的基层社会治理经验,近年来已成为热点研究内容,但由于以往知识视阈的局限和研究工具的欠缺,研究长期处于薄弱且重复状态,一定程度上阻碍了&q... 详细信息

"枫桥经验"是新时期推进社会治安综合治理,实现国家长治久安必须始终坚持和大力弘扬的基层社会治理经验,近年来已成为热点研究内容,但由于以往知识视阈的局限和研究工具的欠缺,研究长期处于薄弱且重复状态,一定程度上阻碍了"枫桥经验"研究的长远发展。运用CiteSpace可视化文献分析软件,以可视化的方式探求研究的内在逻辑,梳理相关发展脉络。对CNKI收录的375篇期刊及博硕论文进行可视化分析,分析脉络(1)统计分析,对文献来源、高产作者及高产单位进行图谱构建分析;(2)关键词共现图谱分析,构建高频关键词与高中心度关键词表格辅以说明;(3)聚类分析,基于TF-IDF算法命名,挖掘关键词的内在逻辑;(4)共现时区视图与突发性网络图谱分析,追随时代发展脉络,掌握前沿热点。最后,总结相关研究结论,预测未来研究方向。

关键词：枫桥经验文献综述 Citespace 可视化分析新时代

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Microvibration streaming measurements using dynamic compressed sensing for satellites

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MEASUREMENT SCIENCE AND TECHNOLOGY 2023年第8期34卷 085015-085015页

作者： Li, Li Zhou, Miaomiao Zhu, ye Tao, Lixuan Liang, xuwen Chinese Acad Sci Innovat Acad Microsatellites Shanghai 201204 Peoples R China Shanghai Engn Ctr Microsatellites Shanghai 201204 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

Long-term monitoring of satellite microvibrations generates a significant amount of data streams, placing strain on satellites with limited transmission capacity. To relieve this transmission strain, a dynamic compressed sensing (CS) framework is proposed for measuring satellite microvibrations. Microvibration streams are measured block by block and then reconstructed using a dynamic recovery algorithm. The recovery solution of one block can be used as a priori knowledge for the next block, allowing for faster updates. However, existing dynamic recovery algorithms are only applicable in the real domain and cannot be applied to microvibrations projected on a Fourier basis in the complex domain. In light of this event, the dynamic homotopy algorithm is expanded to the complex domain to deal with microvibration signals that are sparse in the Fourier basis. In comparison to conventional uniform sampling methods, the experimental results show that the dynamic CS with the expanded recovery algorithm can achieve a maximum root-mean-square acceleration (Grms) deviation of 4% in power spectrum density with one-fifth of the sampling points. Compared to recovery algorithms applicable to fixed measurements, the dynamic algorithm can achieve comparable accuracy in about one-third of the computation time. The experimental findings demonstrate the feasibility of satellite microvibrations measurements using dynamic CS.

关键词： satellite microvibration compressed sensing dynamic homotopy algorithm streaming measurement

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Impact of Oligo(Ethylene Glycol) Side Chains on the Thermoelectric Properties of Naphthalenediimide-Dialkoxybithiazole Polymers

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ACS MATERIALS LETTERS 2024年第4期6卷 1207-1215页

作者： Yang, xuwen ye, Gang Tran, Karolina Liu, Yuru Cao, Jiamin Dong, Jingjin Portale, Giuseppe Liu, Jian Zhang, Ping Loi, Maria Antonietta Chiechi, Ryan C. Koster, L. Jan Anton Univ Groningen Zernike Inst Adv Mat Nijenborgh 4 NL-9747 AG Groningen Netherlands Univ Groningen Stratingh Inst Chem Nijenborgh 4 NL-9747 AG Groningen Netherlands Hunan Univ Sci & Technol Sch Chem & Chem Engn Key Lab Theoret Organ Chem & Funct Mol Minist Educ Xiangtan 411201 Peoples R China Nanjing Tech Univ Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM Key Lab Flexible Elect KLOFE Nanjing 211816 Jiangsu Peoples R China Nanjing Tech Univ Inst Adv Mat IAM Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM Nanjing 211816 Jiangsu Peoples R China Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Polymer Phys & Chem Changchun 130022 Jilin Peoples R China Jiangxi Univ Sci & Technol Sch Elect Engn & Automat Ganzhou 341000 Jiangxi Peoples R China Hubei Univ Sch Mat Sci & Engn Key Lab Green Preparat & Applicat Funct Mat Hubei Key Lab Polymer Mat Wuhan 430062 Peoples R China North Carolina State Univ Dept Chem Raleigh NC 27695 USA

Organic thermoelectric materials have garnered significant interest as promising candidates for energy harvesting applications. In recent years, ethylene-glycol side-chain engineering in organic semiconductors has gradually become an efficient approach to boost the performance of organic thermoelectrics. Although this strategy is widely utilized, the impact of their volume and branching structure remains unknown. This contribution describes a trade-off phenomenon between the oligo(ethylene glycol) (OEG) side chains and thermoelectric properties based on the n-type doped low-bandgap conjugated polymers, achieved through the modification of the volume and structure of side chains. Three conjugated polymers comprising a naphthalenediimide-dialkoxybithiazole backbone and different linear length or branched OEG side chains exhibit good host/dopant miscibility after doping. We find that, in the linear OEG side-chain-based polymers, the increased volume of side chains slightly influences the planarity of backbones, thereby leading to similar and satisfactory thermoelectric performances. The high fraction of side chains does not consistently yield enhanced performance, as the branched OEG side-chain introduces steric hindrance. Consequently, the accordingly conjugated backbones become less planar and rigid, resulting in critical molecular packing changes and low charge carrier mobility and doping efficiency and thus low thermoelectric performance. Our work provides a unique insight into the fundamental understanding of the relationship between molecular packing and thermoelectric properties and guides the future rational design of efficient n-type organic semiconductors.

关键词： Carrier dynamics Conjugated polymers Doping Polymers Thin films

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A Mixed-Ligand Strategy to Modulate P3HT Regioregularity forHigh-Efficiency Solar Cells

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MACROMOLECULES 2022年第8期55卷 3078-3086页

作者： Liu, Yang Xian, Kaihu Zhang, xuwen Gao, Mengyuan Shi, Yibo Zhou, Kangkang Deng, Yunfeng Hou, Jianhui Geng, Yanhou ye, Long Tianjin Univ Sch Mat Sci & Engn Tianjin Key Lab Mol Optoelect Sci Tianjin 300350 Peoples R China Chinese Acad Sci Inst Chem Beijing Natl Lab Mol Sci State Key Lab Polymer Phys & ChemCAS Res Educ Ct Beijing 100190 Peoples R China Joint Sch Natl Univ Singapore & Tianjin Univ Fuzhou 350207 Peoples R China

Sustainable synthesis of polythiophenes (e.g.,P3HT) is highly desired for the development of low-cost organicsolar cells. Regulating the regioregularity of P3HT is a promisingway to boost its performance. yet, few eco-friendly methods canprepare P3HT with tunable regioregularity. Herein, we put forwarda facile strategy tofinely modulate the regioregularity of P3HTfrom 90% to 98% by tuning the molar ratio of two ligands in directarylation polycondensation. Moreover, the ligand effect onregioregularity is well elucidated with DFT calculations, and theregioregularity effect of P3HT in non-fullerene solar cells isclarified for thefirst time. Our calorimetric, microscopic, and scattering results show that regioregularity strongly impacts thepolymer crystallinity and phase separation, and device performance of the blendfilms. The P3HT batch with a regioregularity of 95%yields an unprecedented power conversion efficiency of 10.82%. Importantly, this realizationfirmly provides optimism for cheapmaterials such as polythiophenes, which are made via eco-friendly polycondensation for the application of solar cells and beyond.

关键词： Crystallinity Organic polymers Photovoltaics Power conversion efficiency Solar cells

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Carrier-Carrier Repulsion Limits the Conductivity of N-Doped Organic Semiconductors

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ADVANCED MATERIALS 2024年第44期36卷 e2404397页

作者： Yang, xuwen ye, Gang Liu, Jian Chiechi, Ryan C. Koster, L. Jan Anton Univ Groningen Zernike Inst Adv Mat Nijenborgh 3 NL-9747 AG Groningen Netherlands Hubei Univ Sch Mat Sci & Engn Key Lab Green Preparat & Applicat Funct Mat Hubei Key Lab Polymer Mat Youyi Rd 368 Wuhan 430062 Peoples R China Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Polymer Phys & Chem Changchun 130022 Jilin Peoples R China North Carolina State Univ Dept Chem Raleigh NC 27695 USA

Molecular doping is a key strategy to enhance the electrical conductivity of organic semiconductors. Typically, the electrical conductivity shows a maximum value upon increased doping, after which the conductivity decreases. This decrease in conductivity is commonly attributed to unfavorable changes in the morphology. However, in recent simulation work, has shown, that the conductivity-at high doping-is instead limited by electron-electron repulsion rather than by morphology, at least for some material combinations. Based on the simulations, this limitation is expected to show up in the dependence of the Seebeck coefficient versus carrier density: the Seebeck coefficient will follow Heike's formula if carrier-carrier repulsion limits the conductivity. Here, the electrical conductivity and Seebeck coefficient are measured as a function of doping for a series of n-type organic semiconductors. Additionally, the resulting carrier density is measured using metal-insulator-semiconductor diodes, which link dopant loading and the number of charge carriers. At high carrier densities, the Seebeck coefficient indeed follows Heike's formula, confirming that the conductivity is limited by carrier-carrier repulsion rather than by morphological effects. This study shows that current models of hopping transport in organic semiconductors may be incomplete. As a result, this study offers novel insights in the design of organic semiconductors. The combined dependence of the electrical conductivity and Seebeck coefficient on the carrier density shows that the electrical conductivity at high doping is limited by the repulsion of electrons by other electrons. The carrier density nx corresponding to the maximum electrical conductivity coincides with the carrier density at which the Seebeck coefficient collapses onto Heike's law. image

关键词： doping electrical conductivity hopping transport organic semiconductors

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Discovery of novel small molecules targeting hepatitis B virus core protein from marine natural products with HiBiT-based high-throughput screening

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Acta Pharmaceutica Sinica B 2024年第11期14卷 4914-4933页

作者： Chao Huang Yang Jin Panpan Fu Kongying Hu Mengxue Wang Wenjing Zai Ting Hua Xinluo Song Jianyu ye Yiqing Zhang Gan Luo Haiyu Wang Jiangxia Liu Jieliang Chen xuwen Li Zhenghong Yuan Key Laboratory of Medical Molecular Virology(MOE/NHC) Research Unit of Cure of Chronic Hepatitis B Virus Infection(CAMS)Shanghai Frontiers Science Center of Pathogenic Microbes and InfectionSchool of Basic Medical SciencesShanghai Medical College Fudan UniversityShanghai 200032China State Key Laboratory of Chemical Biology Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China Shandong Laboratory of Yantai Drug Discovery Bohai Rim Advanced Research Institute for Drug DiscoveryYantai 264117China Shanghai Institute of Infectious Disease and Biosecurity Shanghai 200032China Guixi Hospital of Chinese Medicine Guixi 335400China

Due to the limitations of current anti-HBV therapies, the HBV core (HBc or HBcAg) protein assembly modulators (CpAMs) are believed to be potential anti-HBV agents. Therefore, discovering safe and efficient CpAMs is of great value. In this study, we established a HiBiT-based high-throughput screening system targeting HBc and screened novel CpAMs from an in-house marine chemicals library. A novel lead compound 8a, a derivative of the marine natural product naamidine J, has been successfully screened for potential anti-HBV activity. Bioactivity-driven synthesis was then conducted, and the structure‒activity relationship was analyzed, resulting in the discovery of the most effective compound 11a (IC50 = 0.24 μmol/L). Furthermore, 11a was found to significantly inhibit HBV replication in multiple cell models and exhibit a synergistic effect with tenofovir disoproxil fumarate (TDF) and IFNa2 in vitro for anti-HBV activity. Treatment with 11a in a hydrodynamic-injection mouse model demonstrated significant anti-HBV activity without apparent hepatotoxicity. These findings suggest that the naamidine J derivative 11a could be used as the HBV core protein assembly modulator to develop safe and effective anti-HBV therapies.

关键词： Anti-HBV HBV coreprotein Coreproteinassembly modulators Marine natural products HiBiT

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Fabrication of HKUST-1 Based Ink for Direct Writing of Precursors of Primary Explosives 2nd

Fabrication of HKUST-1 Based Ink for Direct Writing of Precu...

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2nd International Conference on Development and Application of Carbon Nanomaterials in Energetic Materials, ICCN 2021

作者： Yang, Caimin Hu, Yan Zeng, Huipeng Liu, xuwen ye, Yinghua Shen, Ruiqi School of Chemistry and Chemical Engineering Nanjing University of Science and Technology Nanjing210094 China Micro-Nano Energetic Devices Key Laboratory Ministry of Industry and Information Technology Nanjing210094 China

ISBN: (纸本)9789811917738

As a direct-write molding technology based on the principle of layer-by-layer accumulation, inkjet printing has shown application prospects in the field of micro-sized energetic materials. Based on HKUST-1, the influence of three binders of polyvinyl alcohol, ethylcellulose, and polyvinylidene fluoride on the printing characteristics of precursor inks was explored. The binder system suitable for ink preparation was screened out, and the best printing parameters were determined. The matching rule between the printing line width and the needle aperture was studied. Moreover, the best ink formula and needle size which can achieve the target line width were selected. The optimized ink was pyrolyzed at a high temperature under an inert atmosphere to prepare a composite of nano-copper coated by porous carbon and copper azide-porous carbon composite energetic materials was in-situ prepared through a gas–solid azidation reaction. This work laid the foundation for the subsequent realization of micro-scale precision charges based on carbon-based copper azide energetic materials. © 2022, China Ordnance Society.

关键词： Ink jet printing

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Numerical Simulation and Process Optimization on Hot Twist-Stretch Straightening of Ti-6Al-4V Alloy Profile

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MATERIALS 2022年第13期15卷 4522-4522页

作者： Deng, xuwen Hui, Songxiao ye, Wenjun Liu, Rui Huang, Liang GRINM Grp Co Ltd State Key Lab Nonferrous Met & Proc Beijing 100088 Peoples R China GRIMAT Engn Inst Co Ltd Beijing 101407 Peoples R China Gen Res Inst Nonferrous Met Beijing 100088 Peoples R China Huazhong Univ Sci & Technol Sch Mat Sci & Engn State Key Lab Mat Proc & Die & Mould Technol Wuhan 430074 Peoples R China

Ti-6Al-4V profiles prepared by hot extrusion are usually accompanied by bending and twisting. The hot twist-stretch straightening is an effective strategy such that the bending deflection and twisting angle can be simultaneously decreased by a single straightening process. In addition, utilizing stress relaxation effect, the residual stress and springback can be greatly reduced by holding the straightening temperature and strain constant for a period after twist-stretch straightening. In this study, the hot deformation behaviors of the Ti-6Al-4V profile were revealed by experiments. The tensile model was obtained by uniaxial tensile tests within ranges of temperatures (500-700 degrees C) and strain rates (5 x 10(-5)-1 x 10(-3) s(-1)). The creep constitutive model was acquired with stress relaxation experiments in ranges of temperatures (500-700 degrees C) and pre-strain of 1.5%. Then, the coupled thermo-mechanical model of hot twist-stretch straightening was established. Based on orthogonal experiment strategy, the effects of straightening temperature, stretch strain, and holding time on the bending deflection and torsion angle of profile were investigated systematically and the process was optimized. The straightening accuracy is significantly affected by straightening temperature and holding time. By using optimized process parameters in practical straightening experiments, the deflection/length and angle/length after straightening does not exceed 2 parts per thousand and 2.5 parts per thousand degrees/mm, respectively, which is basically consistent with the numerical simulation result.

关键词： Ti-6Al-4V profile hot twist-stretch straightening orthogonal experiment thermo-mechanical coupling model

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基于CNKI博硕论文的我国公安研究主题变化趋势及预测

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河南警察学院学报 2018年第3期27卷 128-136页

作者：叶栩闻浙江警察学院经济犯罪侦防研究中心浙江杭州310053

以2001-2016年CNKI收录的"公安"博硕论文作为基础数据,并均分为四个时间段。借助SATI文献分析软件,获取预处理数据,构建相异矩阵,继而聚类分析,后使用Mindmapper绘制研究主题演化图。剖析研究主题的延续、更替与消退情况,进... 详细信息

以2001-2016年CNKI收录的"公安"博硕论文作为基础数据,并均分为四个时间段。借助SATI文献分析软件,获取预处理数据,构建相异矩阵,继而聚类分析,后使用Mindmapper绘制研究主题演化图。剖析研究主题的延续、更替与消退情况,进而绘制战略坐标图,探究"公安"研究主题演化的成熟度与核心度。"公安"连续研究主题重点聚集在有组织犯罪与犯罪分子、违法犯罪与犯罪预防、网络犯罪与社区警务、对策与劳动教养、社区矫正与流动人口等领域,随着时代的进步,迸发出各类新兴主题。本研究全面整理"公安"研究的主题脉络,为"公安"研究发展提供参考,促使公安学的全面持续发展。

关键词：公安研究主题聚类分析战略坐标图可视化分析博硕论文

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Satellite microvibration measurement based on distributed compressed sensing

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MEASUREMENT 2022年 203卷

作者： Li, Li Zhou, Miaomiao Zhu, ye Dai, Ya Liang, xuwen Chinese Acad Sci Innovat Acad Microsatellites Shanghai 201204 Peoples R China Shanghai Engn Ctr Microsatellites Shanghai 201204 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

To reduce the burden of multiple sensors on satellites with limited resources, distributed compressed sensing (DCS) is applied to microvibration measurement. An improved joint recovery algorithm using the recovered spectrum coefficients as the halting condition is proposed. This improvement can address the drawback that the previous algorithms need to anticipate signal sparsity or use residuals that do not reflect recovery accuracy in the frequency domain as the halting condition. In addition, acceleration is adopted in the improved algorithm. The DCS-based microvibration measurement was conducted on a satellite mechanical test model. The results reveal that the DCS measurement has a difference in the order of 1e-10 g2/Hz between the power spectrum density (PSD) of the raw data and the recovery data. With one-fifth sampling points of the raw signal, it can achieve a signal difference of less than 4% in PSD, which demonstrates the viability of satellite microvibration measure-ment based on DCS.

关键词： Microvibration measurement Distributed compressed sensing Joint recovery algorithm Power spectrum density

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