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西溪河交通输水两用拱桥杆系有限元分析

水科学与工程技术 2024年第4期 69-73页

作者：吴浩然刘睿璇贵州省水利水电勘测设计研究院有限公司贵阳550000 江苏省南京市滁河河道管理处南京210048

西溪河交通输水两用拱桥采用“上层通车,下层过水”布置,将输水钢管与公路桥结合起来,充分利用拱式结构承载力较强的优势,最大限度优化工程建筑物布置。但两种功能的结合也带来较为复杂的结构形式和荷载,需要详细分析桥梁结构的受力情况... 详细信息

西溪河交通输水两用拱桥采用“上层通车,下层过水”布置,将输水钢管与公路桥结合起来,充分利用拱式结构承载力较强的优势,最大限度优化工程建筑物布置。但两种功能的结合也带来较为复杂的结构形式和荷载,需要详细分析桥梁结构的受力情况,并以此为依据做好结构布置和配筋设计。基于MIDAS CIVIL桥梁杆系有限元计算软件,建立完整的桥梁上下部结构,同时考虑公路桥梁和水工建筑物荷载,对西溪河交通输水两用拱桥内力和变形进行分析。

关键词：公路输水两用拱桥杆系有限元分析 Midas civil桥梁计算

Efficient protocols for heavy hitter identification with local differential privacy

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Frontiers of Computer Science 2022年第5期16卷 193-203页

作者： Dan ZHAO Suyun ZHAO Hong CHEN ruixuan liu Cuiping LI Wenjuan LIANG Key Laboratory of Data Engineering and Knowledge Engineering of Ministry of Education Renmin University of ChinaBeijing 100872China School of Information Renmin University of ChinaBeijing 100872China

Local differential privacy(LDP),which is a technique that employs unbiased statistical estimations instead of real data,is usually adopted in data collection,as it can protect every user’s privacy and prevent the leakage of sensitive *** segment pairs method(SPM),multiple-channel method(MCM)and prefix extending method(PEM)are three known LDP protocols for heavy hitter identification as well as the frequency oracle(FO)problem with large ***,the low scalability of these three LDP algorithms often limits their ***,communication and computation strongly affect their ***,excessive grouping or sharing of privacy budgets makes the results *** address the abovementioned problems,this study proposes independent channel(IC)and mixed independent channel(MIC),which are efficient LDP protocols for FO with a large *** design a flexible method for splitting a large domain to reduce the number of ***,we employ the false positive rate with interaction to obtain an accurate *** experiments demonstrate that IC outperforms all the existing solutions under the same privacy guarantee while MIC performs well under a small privacy budget with the lowest communication cost.

关键词： local differential privacy frequency oracle heavy hitter

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江苏水利 2024年第1期 43-46页

作者：李涛胡若轩徐俊孟繁渠刘睿璇南京市滁河河道管理处江苏南京210048

以滁河防洪治理近期工程为例,梳理总结了水利工程施工废水的种类、产生、特点、影响以及处理措施,对施工废水处理的未来发展方向进行剖析,探讨水利工程施工废水处理的规范化和标准化建设思路。

关键词：施工废水水利工程标准化

Tailoring electron vortex beams with customizable intensity patterns by electron diffraction holography

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Opto-Electronic Advances 2024年第2期7卷 14-21页

作者： Pengcheng Huo ruixuan Yu Mingze liu Hui Zhang Yan-qing Lu Ting Xu National Laboratory of Solid-State Microstructures and Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China College of Engineering and Applied Sciences Key Laboratory of Intelligent Optical Sensing and Manipulation and Jiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjing 210093China

An electron vortex beam(EVB) carrying orbital angular momentum(OAM) plays a key role in a series of fundamental scientific researches, such as chiral energy-loss spectroscopy and magnetic dichroism spectroscopy. So far, almost all the experimentally created EVBs manifest isotropic doughnut intensity patterns. Here, based on the correlation between local divergence angle of electron beam and phase gradient along azimuthal direction, we show that free electrons can be tailored to EVBs with customizable intensity patterns independent of the carried OAM. As proof-of-concept, by using computer generated hologram and designing phase masks to shape the incident free electrons in the transmission electron microscope, three structured EVBs carrying identical OAM are tailored to exhibit completely different intensity patterns. Furthermore, through the modal decomposition, we quantitatively investigate their OAM spectral distributions and reveal that structured EVBs present a superposition of a series of different eigenstates induced by the locally varied geometries. These results not only generalize the concept of EVB, but also demonstrate an extra highly controllable degree of freedom for electron beam manipulation in addition to OAM.

关键词： electron vortex beam orbital angular momentum diffraction holography

Supported Atomically Dispersed Pd Catalyzed Direct Alkoxylation and Allylic Alkylation

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Chinese Journal of Chemistry 2024年第7期42卷 719-724页

作者： ruixuan Qin Ziwen Chen Qingyuan Wu Nanfeng Zheng Pengxin liu New Cornerstone Science Laboratory State Key Laboratory for Physical Chemistry of Solid SurfacesCollaborative Innovation Center of Chemistry for Energy Materialsand National&Local Joint Engineering Research Center of Preparation Technology of NanomaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamenFujian 361005China Innovation Laboratry for Scences and Technoogies of Energy Materials of Fujan Province(IKKM) Xiamen Fujian 361102China School of Physical Science and Technology Shanghai Tech UniversityShanghai 201210China Fujian Key Laboratory of Rare-earth Functional Materials Fujian Shanhai Collaborative Innovation Center of Rare-earth Functional MaterialsLongyanFujian 366300China

A new approach to allylic alkylation is realized using an atomically dispersed palladium catalyst(Pd1/TiO2-EG).Unlike conventional methods that require derivation of substrates and utilization of additives,this method allows for direct allylic alkylation from allylic alcohols,producing H2O as the sole *** catalyst's high efficiency is attributed to the local hydrogen bonding at the or-ganic-inorganic interface(Pd-EG interface),facilitating hydroxyl group activation forη3π-allyl complex *** system demonstrates successful direct C—O and C—C coupling reactions with high selectivity,requiring no *** study highlights the potential of supported atomically dispersed catalysts for greener and more efficient catalysis,meanwhile,offers unique insights into the distinct behavior of atomically dispersed catalysts in comparison to homogeneous or nanoparticle-based catalysts.

关键词： Atomically dispersed catalyst Alkylation C—C coupling Organic-inorganic Interface Hydrogen bond Tsuji-Trost reaction Green catalysis

Evaluating the Effect of Various Walking Conditions on KINECT-based Gait Recognition

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Instrumentation 2022年第2期9卷 13-25页

作者： liu ruixuan Marina L.GAVRILOVA Renmin University of China Beijing 100872China Biometric Technologies Laboratory University of CalgaryCanada

Human gait is one of the unobtrusive behavioral biometrics that has been extensively studied for various commercial and government *** security,medical rehabilitation,virtual reality,and autonomous driving cars are some of the fields of study that rely on accurate gait *** majority of studies have been focused on achieving very high recognition performance on a specific dataset,different issues arise in the real-world applications of this *** research is one of the first to evaluate the effects of changing walking speeds and directions on gait recognition rates under various walking *** was collected using the KINECT *** draw an overall conclusion about the effects of walking speed and di-rection to the sensor,we define distance features and angle ***,we propose two feature fusion methods for person *** of the study provide insights into how walking speeds and walking di-rections to the KINECT sensor influence the accuracy of gait recognition.

关键词： Gait Recognition Kinect Sensor Feature Fusion Walking Conditions Biometric Security

Relationship between the unique microstructures and behaviors of high-entropy alloys

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1350-1363页

作者： Yaqi Wu Peter KLiaw ruixuan Li Weiran Zhang Guihong Geng Xuehui Yan Guiqun liu Yong Zhang State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996USA Xi’an Rare Metal Materials Institute Co.Ltd. Xi’an 710016China School of Materials Science and Engineering North Minzu UniversityYinchuan 750030China GRIMAT Engineering Institute Co. Ltd.Beijing 101407China

High-entropy alloys(HEAs),which were introduced as a pioneering concept in 2004,have captured the keen interest of nu-merous ***,in this context,can be perceived as representing disorder and *** contrast,elemental composi-tions within alloy systems occupy specific structural sites in space,a concept referred to as *** accordance with Shannon entropy,structure is analogous to ***,the arrangement of atoms within a material,termed its structure,plays a pivotal role in dictating its *** addition to expanding the array of options for alloy composites,HEAs afford ample opportunities for diverse structural *** profound influence of distinct structural features on the exceptional behaviors of alloys is underscored by numer-ous *** features include remarkably high fracture strength with excellent ductility,antiballistic capability,exceptional radi-ation resistance,and corrosion *** this paper,we delve into various unique material structures and properties while elucidating the intricate relationship between structure and performance.

关键词： high-entropy alloys unique microstructure special properties alloy design

Interfacial oxidized Pd species dominate catalytic hydrogenation of polar unsaturated bonds

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Nano Research 2024年第1期17卷 228-234页

作者： Pengyao You Shaoqi Zhan Pengpeng Ruan ruixuan Qin Shiguang Mo Yazhou Zhang Kunlong liu Lansun Zheng Nanfeng Zheng State Key Laboratory for Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materialsand Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Department of Chemistry BMCUppsala UniversityBMC Box 576Uppsala S-75123Sweden Department of Chemistry University of OxfordOxford OX13QZUK

The determination of catalytically active sites is crucial for the design of efficient and stable catalysts toward desired ***,the complexity of supported noble metal catalysts has led to controversy over the locations of catalytically active sites(e.g.,metal,support,and metal/support interface).Here we develop a structurally controllable catalyst system(Pd/SBA-15)to reveal the catalytic active sites for the selective hydrogenation of ketones to alcohol using acetophenone hydrogenation as model *** investigations demonstrated that unsupported Pd nanocrystals have no catalytic activity for acetophenone ***,oxidized Pd species were catalytically highly active for acetophenone *** catalytic activity decreased with the decreased oxidation state of *** work provides insights into the hydrogenation mechanism of ketones but also other unsaturated compounds containing polar bonds,e.g.,nitrobenzene,N-benzylidene-benzylamine,and carbon dioxide.

关键词： oxidized Pd metal/oxide interface constant particle size Pd/SBA-15 acetophenone hydrogenation

Machine learning methods for predicting the uniaxial compressive strength of the rocks:a comparative study

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Frontiers of Earth Science 2024年第2期18卷 400-411页

作者： Tao WEN Decheng LI Yankun WANG Mingyi HU ruixuan TANG School of Geosciences Yangtze UniversityWuhan 430100China Badong National Observation and Research Station of Geohazards China University of GeosciencesWuhan 430074China Jiacha County Branch of Hubei Yangtze University Technology Development Co. LtdShannan 856499China

The uniaxial compressive strength(UCS)of rocks is a critical index for evaluating the mechanical properties and construction of an engineering rock mass classification *** most commonly used method for determining the UCS in laboratory settings is expensive and *** this reason,UCS can be estimated using an indirect determination method based on several simple laboratory tests,including point-load strength,rock density,longitudinal wave velocity,Brazilian tensile strength,Schmidt hardness,and shore *** this study,six data sets of indices for different rock types were utilized to predict the UCS using three nonlinear combination models,namely back propagation(BP),particle swarm optimization(PSO),and least squares support vector machine(LSSVM).Moreover,the best prediction model was examined and selected based on four performance prediction *** results reveal that the PSO–LSSVM model was more successful than the other two models due to its higher performance *** ratios of the predicted UCS to the measured UCS for the six data sets were 0.954,0.982,0.9911,0.9956,0.9995,and 0.993,*** results were more reasonable when the predicted ratio was close to a value of approximately 1.

关键词： uniaxial compressive strength particle swarm optimization least squares support vector machine prediction model prediction performance