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NON-PARAMETRIC TOPIC MODEL FOR DISCOVERING GEOGRAPHICAL TOPIC VARIATIONS

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Journal of Electronics(China) 2014年第6期31卷 576-586页

作者： Qi Xiang Huang Yu Song Jun Huang Tinglei Wang Hongqi fu kun Key Laboratory of Technology in Geo-spatial Information Processing and Application System Institute of Electronics Chinese Academy of Sciences University of Chinese Academy of Sciences

This paper presents a non-parametric topic model that captures not only the latent topics in text collections, but also how the topics change over space. Unlike other recent work that relies on either Gaussian assumptions or discretization of locations, here topics are associated with a distance dependent Chinese Restaurant Process(ddC RP), and for each document, the observed words are influenced by the document's GPS-tag. Our model allows both unbound number and flexible distribution of the geographical variations of the topics' content. We develop a Gibbs sampler for the proposal, and compare it with existing models on a real data set basis.

关键词： Text mining Topic model Geographical topics Bayesian non-parameter

Bioinspired Additive Manufacturing of Hierarchical Materials: From Biostructures to functions

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Research 2024年第1期2023卷 533-559页

作者： Jingjiang Wei Fei Pan Hang Ping kun Yang Yanqing Wang Qingyuan Wang Zhengyi fu Institute for Advanced Materials Deformation and Damage from Multi-Scale Institute for Advanced StudyChengdu UniversityChengdu 610106P.R.China Department of Chemistry University of BaselBasel 4058Switzerland State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070P.R.China College of Polymer Science and Engineering Sichuan UniversityChengdu 610065P.R.China

Throughout billions of years,biological systems have evolved sophisticated,multiscale hierarchical structures to adapt to changing *** are synthesized under mild conditions through a bottom-up self-assembly process,utilizing substances from the surrounding environment,and meanwhile are regulated by genes and *** manufacturing,which mimics this natural process,provides a promising approach to developing new materials with advantageous properties similar to natural biological *** review presents an overview of natural biomaterials,emphasizing their chemical and structural compositions at various scales,from the nanoscale to the macroscale,and the key mechanisms underlying their ***,this review describes the designs,preparations,and applications of bioinspired multifunctional materials produced through additive manufacturing at different scales,including nano,micro,micro-macro,and macro levels.

关键词： materials structures utilizing

Metal-to-insulator transition in platinum group compounds

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Rare Metals 2024年第8期43卷 3460-3474页

作者： Yu-Xuan Xia Jian-Gang He Nuo-fu Chen Ji-kun Chen School of New Energy North China Electric Power UniversityBeijing102206China School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083China Key Laboratory of Advanced Materials and Devices for PostMoore Chips(Ministry of Education) School of Materials Science and EngineeringJniversity of Science and Technology BeijingBeijing 100083China

The metal-to-insulator transition(MIT) as usually achieved in 3d-orbital transitional metal(TM) compounds opens up a new paradigm in correlated electronics via triggering abrupt variations in their transportation *** to such 3d-orbital TM compounds,the MIT within the platinum group(Pg) element compounds based on the 4d-and 5d-orbital configurations is more complicated,owing to their elevation in the spinorbit coupling and meanwhile weakened intra-atomic Coulomb *** brings in a new freedom to regulate the balance in their metallic or semiconductive orbital configurations,while their MIT properties can be potentially combined with their spintronic properties to enable new electronic ***,we review the electronic transport and MIT behaviors within the existing family of Pg-containing compounds,particularly those showing first-order MIT behaviors that can be useful in correlated *** is also hoped that summarizing the presently reported Pg-containing MIT compounds will lead to the discovery of more new material families and/or new mechanisms associated with the Pg-containing compounds showing MIT properties.

关键词： Metal-to-insulator transition Platinum group compounds Electron correlation Spin-orbital coupling

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基于无人机携带自主避障功能研究

现代工业经济和信息化 2024年第5期14卷 79-81页

作者：陈凯朱建军李汶翰王远新竺子淞付坤郑州科技学院河南郑州450064

针对解决心脏病患者和突发事故导致需要做心肺复苏的人的需求,提出了一种无人机携带自主避障功能研究的方法。通过双目摄像头、毫米波雷达、红外测距传感器三者完成无人机的避障功能,通过所设计的一款磁吸装置以及配套的收纳盒装置以完... 详细信息

针对解决心脏病患者和突发事故导致需要做心肺复苏的人的需求,提出了一种无人机携带自主避障功能研究的方法。通过双目摄像头、毫米波雷达、红外测距传感器三者完成无人机的避障功能,通过所设计的一款磁吸装置以及配套的收纳盒装置以完成无人机的携带功能。

关键词：自主避障红外测距无人机抗干扰 AED

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突加载荷法在模拟爆破中的应用

辽宁工程技术大学学报（自然科学版） 2006年第4期25卷 543-545页

作者：肖福坤黑龙江科技学院资源与环境工程学院黑龙江哈尔滨150027

应用突加载荷法来模拟爆破振动响应,探讨利用采集到的硐室表面的振动速度或位移等物理量这些测试结果来反演岩体内部的应力场。模拟中采用位移等效原则来确定突加载荷的大小、作用时间和作用范围,通过岩体力学有限元分析软件来计算,以... 详细信息

应用突加载荷法来模拟爆破振动响应,探讨利用采集到的硐室表面的振动速度或位移等物理量这些测试结果来反演岩体内部的应力场。模拟中采用位移等效原则来确定突加载荷的大小、作用时间和作用范围,通过岩体力学有限元分析软件来计算,以进行岩体内的动态应力场的分析和巷道围岩稳定性的研究,确定岩体临界振动速度时临界爆破药量。将此方法应用工程实际当中,取得了显著的效果。

关键词：突加载荷法爆破应力场围岩稳定性

High-entropy alloy stabilized and activated Pt clusters for highly efficient electrocatalysis

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SusMat 2022年第2期2卷 186-196页

作者： Wenhui Shi Hanwen Liu Zezhou Li Chenghang Li Jihan Zhou Yifei Yuan Feng Jiang (Kelvin)kun fu Yonggang Yao State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanP.R.China Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular EngineeringPeking UniversityBeijingP.R.China College of Chemistry and Materials Engineering Wenzhou UniversityWenzhouP.R.China Sustainable functional Biomaterials Lab Department of Wood ScienceUniversity of British ColumbiaVancouverCanada Department of Mechanical Engineering University of DelawareNewarkUSA

Although Pt and other noble metals are the state-of-the-art catalysts for various energy conversion applications,their low reserve,high cost,and instability limit their large-scale ***,we report a hybrid catalysts design featuring noble metal clusters(e.g.,Pt)uniformly dispersed and stabilized on high-entropy alloy nanoparticles(HEA,e.g.,FeCoNiCu),denoted as HEA@Pt,which is prepared via ultra-fast shock synthesis(∼300 ms)for HEA alloying combined with Pt galvanic replacement for surface *** our design,the HEA core critically ensures high dispersity,stability,and tunability of the surface Pt clusters through high entropy stabilization and core-shell *** an example in the hydrogen evolution reaction,HEA@Pt achieved a significant mass activity of 235 A/gPt,which is 9.4,3.6,and 1.9-times higher compared to that of homogeneous FeCoNiCuPt(HEA-Pt),Pt,and commercial Pt/C,*** also demonstrated noble Ir stabilized on FeCoNiCrMn nanoparticles(HEA-5@Ir),achieving excellent anodic oxygen evolution performance and highly efficient overall water splitting when combined with the cathodic HEA@***,our work developed a general catalysts design strategies by using high entropy nanoparticles for effective dispersion,stabilization,and modulation of surface active sites,achieving a harmonious combination of high activity,stability,and low cost.

关键词： entropy stabilization high entropy alloy catalysts hybrid structure hydrogen evolution reaction overall water splitting

归脾汤加减治疗老年高血压病合并抑郁症患者对血压、负性心理及生活质量影响的Meta分析

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世界中西医结合杂志 2024年第4期19卷 654-661页

作者：周凌风牛增辉付莹坤崔美玉雷燕杨静中国中医科学院医学实验中心北京100700 中国中医科学院广安门医院北京100053

目的通过使用循证医学体系评价方法,并以科学的统计方法Meta分析为依据,系统评价归脾汤加减治疗老年性高血压合并抑郁症及其对生活质量的影响。方法计算机检索中华医学期刊全文数据库、中国知网(CNKI)、万方数据知识平台、维普网(维... 详细信息

目的通过使用循证医学体系评价方法,并以科学的统计方法Meta分析为依据,系统评价归脾汤加减治疗老年性高血压合并抑郁症及其对生活质量的影响。方法计算机检索中华医学期刊全文数据库、中国知网(CNKI)、万方数据知识平台、维普网(维普资讯VIP)、ClinicalKey、Wiley Online Library、Cochrane图书馆、PubMed数据库(NCBI外文医学数据库)、Karger医学电子期刊、Embase、Elsevier、The Lancet、NEJM、JAMA、BMJ、SinoMed数据库,纳入归脾汤加减治疗老年性高血压合并抑郁症的临床随机对照试验(Randomized controlled trial,RCT)。文献检索的范围为数据库建立时间至2023年1月31日。使用Zotero文献管理工具对检出的文献进行处理;筛选出的文献通过Cochrane偏倚风险评估工具和改良Jadad评分法,进行文献质量评估与评价;结果分析利用Review Manager 5.4软件完成。结果共纳入13项,共1364例患者。Meta分析结果显示,治疗收缩压(WMD=-12.13,95%CI[-13.51,-10.75],P<0.000 01);舒张压(WMD=-8.53,95%CI[-10.40,-6.66],P<0.000 01);汉密尔顿抑郁量表评分(WMD=-4.79,95%CI[-6.10,-3.49],P<0.000 01);生命质量评价量表评分(WMD=-12.12,95%CI[7.31,16.94],P<0.000 01);抑郁自评量表评分(WMD=-6.07,95%CI[-7.35,-4.78],P<0.000 01)均明显优于对照组。结论归脾汤加减治疗可以在老年人高血压水平方面达到降压效果,且在改善其抑郁症状并提高生活质量方面疗效显著。

关键词：归脾汤老年高血压抑郁症随机对照试验 Meta分析

Single-atom Ni-N_(4) for enhanced electrochemical sensing

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Nano Research 2024年第8期17卷 7658-7664页

作者： Zhuhui Qin Bo Tang Guiru Zhang Chongqing Zhu kun Jiang Bowei Zhang fu-Zhen Xuan Shanghai Key Laboratory of Intelligent Sensing and Detection Technology East China University of Science and TechnologyShanghai 200237China Key Laboratory of Pressure Systems and Safety of Ministry of Education East China University of Science and TechnologyShanghai 200237China School of Mechanical and Power Engineering East China University of Science and TechnologyShanghai 200237China Key Laboratory of Theoretical and Computational Photochemistry Ministry of EducationCollege of ChemistryBeijing Normal UniversityBeijing 100875China Interdisciplinary Research Center School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Single-atom catalysts(SACs)attract widespread attention in heterogeneous catalysis due to their maximum atomic utilization efficiency and unique physical and chemical ***,their applications in chemical sensing keep huge potential but remain ***,a Ni-N_(4)-C SAC was synthesized for the trace detection of dopamine(DA)and uric acid(UA).The Ni-N_(4)-C SAC exhibited superior sensing performance compared to the Ni *** detection range for DA and UA were 0.05–75μM and 5–90μM with detection limits of 0.027 and 0.82μM,*** functional theory(DFT)computations indicate that Ni-N_(4)-C has a lower reaction barrier during electrochemical process,indicating that the atomic Ni sites possess higher intrinsic activity than Ni ***,DA and UA show strong potential dependency on the Ni-N_(4)-C catalyst,indicating its applicability for their concurrent *** work extends the application of SACs in chemical sensing.

关键词： single-atom catalysts chemical sensing dopamine uric acid

Preparation and Characterization of Gold Thin Film Electrode Modified by Microbe

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Chinese Chemical Letters 1999年第4期10卷 311-312页

作者： Jin kun fu Rong Zong HU Wei De ZHANG Xin Sheng YU Jin Yin fu(State Key Laboratory for Physical Chemistry of Solid Surface, Department of Chemistry and Institute of Physical Chemistry, Xiamen University, Xiamen 361005) State Key Lab. Phys. Chem. Solid S. Department of Chemistry Xiamen University Xiamen 361005 China

A novel method based on microbe modification has been employed to prepare gold thin film electrode. The preparation method is simple and the electrode obtained is stable and very sensitive in determining heavy metal i... 详细信息

关键词： gold thin film electrode microbe modification trace analysis