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Performance assessment of innovative seismic resilient steel knee braced frame

Frontiers of Structural and Civil Engineering 2016年第3期10卷 291-302页

作者： Tony T. Y. YANG yuanjie li International Joint Research Laboratory of Eearthquake Engineering 1239 Siping Road Shanghai 200002 China Department of Civil Engineering University of British Columbia Vancouver BC V6T1Z4 Canada

Buckling restrained knee braced truss moment frame （BRKBTMF） is a novel and innovative steel structural system that utilizes the advantages of long-span trusses and dedicated structural fuses for seismic applications. Steel trusses are very economical and effective in spanning large distance. However, conventional steel trusses are typically not suitable for seismic application, due to its lack of ductility and poor energy dissipation capacity. BRKBTMF utilizes buckling restrained braces （BRBs） as the designated structural fuses to dissipate the sudden surge of earthquake energy. This allows the BRKBTMF to economically and efficiently create large span structural systems for seismic applications. In this paper, a prototype BRKBTMF office building located in Berkeley, California, USA, was designed using performance-based plastic design procedure. The seismic performance of the prototype building was assessed using the state-of-the-art finite element software, OpenSees. Detailed BRB hysteresis and advanced element removal technique was implemented. The modeling approach allows the simulation for the force-deformation response of the BRB and the force redistribution within the system after the BRBs fracture. The developed finite element model was analyzed using incremental dynamic analysis approach to quantify the seismic performance of BRKBTMF. The results show BRKBTMF has excellent seismic performance with well controlled structural responses and resistance against collapse. In addition, life cycle repair cost of BRKBTMF was assessed using the next-generation performance-based earthquake engineering framework. The results confirm that BRKBTMF can effectively control the structural and non-structural component damages and minimize the repair costs of the structure under different ranges of earthquake shaking intensities. This studies conclude that BRKBTMF is a viable and effective seismic force resisting system.

关键词： buckling restrained brace innovative structural system collapse simulation seismic assessment

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Spatial-Temporal Ground Deformation Study of Baotou Based on the PS-InSAR Method

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Acta Geologica Sinica(English Edition) 2021年第2期95卷 674-683页

作者： GE Weili li yuanjie WANG Zhichao ZHANG Chunming YANG Honglei Inner Mongolia Geological Environmental Monitoring Institute Hohhot 010020China Inner Mongolia Coal Construction and Ecological Environment Research Institute Co.Ltd Hohhot 010020China China University of Geosciences(Beijing) Beijing 100101China

Ground subsidence is an emerging geological hazard in Baotou,Inner *** areas of Baotou with relatively large subsidence range and rate were selected for *** on investigation of ground subsidence using PS-In SAR technology,a total of 43 frames of ALOS PALSAR images yielded a SAR data span from December 2006 to January 2011,allowing ground subsidence scope,subsidence velocity,time-series deformation to be *** causes and influencing factors of the ground subsidence are closely related to soft soil consolidation and compaction and the decrease in the level of groundwater caused by increased development and utilization of groundwater.

关键词： geophysics ground subsidence PS-In SAR soft soil compaction groundwater Inner Mongolia

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Parasite-host network analysis provides insights into the evolution of two mistletoe lineages(Loranthaceae and Santalaceae)

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Plant Diversity 2023年第6期45卷 702-711页

作者： Jin Zhao yuanjie li Xuanni Wang Manru li Wenbin Yu Jin Chen ling Zhang CAS Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMengla 666303YunnanChina Engineering Research Center of Eco-environment in Three Gorges Reservoir Region Ministry of EducationChina Three Gorges UniversityYichang 443002HubeiChina Graduate School of the Chinese Academy of Sciences Beijing 100049China linnaeus Labs Technology Co. LtdWuyuan 333200JiangxiChina

Mistletoes are ecologically important parasitic plants,with> 1600 species from five lineages *** lineages exhibit distinct patterns of species diversification and host specificity,however,the mechanisms underlying these differences are poorly *** this study,we analysed a comprehensive parasite-host network,including 280 host species from 60 families and 22 mistletoe species from two lineages(Santalaceae and Loranthaceae) in Xishuangbanna,located in a biodiversity hotspot of tropical *** identified the factors that predict the infection strength of *** also detected host specificity and the phylogenetic signal of mistletoes and their *** found that this interaction network could be largely explained by a model based on the relative abundance of *** infection was positively correlated with diameter at breast height and tree coverage,but negatively correlated with wood ***,closely related mistletoe species tend to interact more often with similar ***,the two lineages showed a significantly different network *** of host generality were higher in Loranthaceae than in Santalaceae,although neither lineage showed phylogenetic signal for host *** study demonstrates that the neutral interaction hypothesis provides suitable predictions of the mistletoe-host interaction network,and mistletoe species show significant phylogenetic signals for their *** findings also indicate that high species diversification in Loranthaceae may be explained by high rates of host generality and the evolutionary history shared by Loranthaceae species with diverse host plants in the tropics.

关键词： Loranthaceae Mistletoeehost interaction Neutral interaction hypothesis Parasiteehost network Santalaceae

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High-Risk LEO Satellite Network Path Detection Based on Spatial and Temporal Delay Anomaly Analysis

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China Communications 2023年第7期20卷 57-71页

作者： Tianyu Zhang Hewu li Jun liu Lu Lu Qian Wu Shaowen Zheng Zeqi Lai yuanjie li Institute for Network Sciences and Cyberspace Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology Beijing 100084China China Mobile Research Institute Beijing 100053China

The gradual deployment of Low-Earth Orbit(LEO)mega constellations with inter-satellite links(ISLs)promises ubiquitous,low-latency,and high-throughput satellite network ***,networked LEO satellites with ISLs are also at risk of routing attacks such as *** defenses against route hijacking in terrestrial networks can hardly work for the LEO satellite network due to its high spatiotemporal *** deal with it,we propose RPD,a high-risk routing path detection method for LEO mega-constellation *** detects abnormal high-risk LEO network paths by checking the consistency between the path delay and the geographical *** is efficiently achieved by combining in-band measurements and out-of-band statistical processing to detect the anomaly of the clustering feature in the reference delay *** avoids the recalculation of the header cryptographic marks when the handover occurs,thus greatly reducing the cost and improving the performance of highrisk path *** showed that the proposed RPD mechanism achieves an average detection accuracy of 91.64%under normal network conditions,and maintain about 89%even when congestion occurs in multiple areas of the network and measurement noise is *** addition,RPD does not require any cryptographic operation on the intermediate node,only minimal communication cost with excellent scalability and deployability.

关键词： LEO satellite networks route hijacking path verification risky path detection

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Characterization and structure analysis of the heterosolvate of erythromycin thiocyanate

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Chinese Journal of Chemical Engineering 2022年第4期35卷 268-274页

作者： yuanjie li Qiuxiang Yin Meijing Zhang Ying Bao Baohong Hou Jingkang Wang Jiting Huang ling Zhou School of Chemical Engineering and Technology State Key Laboratory of Chemical EngineeringTianjin UniversityTianjin 300350China Collaborative Innovation Center of Chemical Science and Chemical Engineering(Tianjin) Tianjin 300072China Luoxin Pharmaceutical(Shanghai)Co. Ltd.Shanghai 201203China

Erythromycin thiocyanate is widely used for the production of other macrolide antibiotics. In this work, a novel heterosolvate of this pharmaceutical compound has been obtained and characterized for the first time, which was transformed from the dihydrate form in the acetone solvent through evaporation crystallization. Thermal behavior together with compositional analysis revealed that both water and acetone molecules participated in the formation of the crystal lattice which is rarely reported before. The general chemical name of the heterosolvate may be defined as erythromycin thiocyanate sesquihydrate hemiacetonate. Furthermore, studies on solid-state spectral analysis provided strong evidence of intermolecular hydrogen bonds in heterosolvate crystals. According to the crystal structure determined by single crystal X-ray diffraction, the formation mechanism of the heterosolvate is proposed in which strong multihydrogen bondings between water and solute molecules form the layer structure. While acetone molecules form single-hydrogen bonds with solutes and reside in channels between layers. This well explains why acetone solvent is easy to escape from the crystal structure during desolvation.

关键词： Erythromycin thiocyanate Heterosolvate Structure analysis Crystallization Thermodynamic properties Transition

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Unsourced Multiple Access for 6G Massive Machine Type Communications

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China Communications 2022年第3期19卷 70-87页

作者： yuanjie li Jincheng Dai Zhongwei Si Kai Niu Chao Dong Jiaru lin Sen Wang Yifei Yuan Key Laboratory of Universal Wireless Communications Beijing University of Posts and TelecommunicationsBeijing 100876China China Mobile Research Institute Beijing 100053China

Unsourced multiple access(UMA)is a multi-access technology for massive,low-power,uncoordinated,and unsourced Machine Type Communication(MTC)*** ensures transmission reliability under the premise of high energy *** on the analysis of the 6G MTC key performance indicators(KPIs)and scenario characteristics,this paper summarizes its requirements for radio access *** this,the existing multiple access models are analyzed under these standards to determine UMA's advantages for 6G MTC according to its design *** critical technology of UMA is the design of its multiple-access coding ***,the existing UMA coding schemes from different coding paradigms are further summarized and *** particular,this paper comprehensively considers the energy efficiency and computational complexity of these schemes,studies the changes of the above two indexes with the increase of access scale,and considers the trade-off between the *** is revealed by the above analysis that some guiding rules of UMA coding ***,the open problems and potentials in this field are given for future research.

关键词： unsourced multiple access machine type communications 6G massive random access uncoordinated

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Demand for Benzole Increases Rapidly

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China Chemical Reporter 2007年第23期18卷 17-18页

作者： li yuanjie

Stable output increaseThe rapid development of the iron andsteel industry in China has promoteddramatic growth in the output of cokein recent *** with the impact ofmacro economic controls and environ-mental protection... 详细信息

关键词： Hebei benzene environ thousand Shandong Shanxi xyl

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Joint Multi-User Detection with Weighting Factors for Unsourced Multiple Access

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Journal of Computer and Communications 2023年第9期11卷 121-131页

作者： Yu liu Kai Niu yuanjie li The Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing China

Multi-user detection techniques are currently being studied as highly promising technologies for improving the performance of unsourced multiple access systems. In this paper, we propose joint multi-user detection schemes with weighting factors for unsourced multiple access. First, we introduce bidirectional weighting factors in the extrinsic information passing process between the multi-user detector based on belief propagation (BP) and the LDPC decoder. Second, we incorporate bidirectional weighting factors in the message passing process between the MAC nodes and the user variable nodes in BP- based multi-user detector. The proposed schemes select the optimal weighting factors through simulations. The simulation results demonstrate that the proposed schemes exhibit significant performance improvements in terms of block error rate (BLER) compared to traditional schemes. .

关键词： Communication Sparse IDMA Multi-User Detection Belief Propagation

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A Supplement to the Invariance Principle of the Speed of light and the Quantum Theory

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Journal of Modern Physics 2015年第2期6卷 126-130页

作者： yuanjie li Wenchuan Jia Jiale Wang Huazhong University of Science and Technology Wuhan China School of Mechanical Engineering and Automation Shanghai University Shanghai China South University of Science and Technology of China Shenzhen China

Richard Feynman once said, “I think it is safe to say that no one understands Quantum Mechanics”. The well-known article on the Einstein-Podolsky-Rosen (EPR) paradox brought forth further doubts on the interpretation of quantum theory. Einstein’s doubt on quantum theory is a doubleedged sword: experimental verification of quantum theory would contradict the hypothesis that speed of light is finite. It has been almost a century since the creation of quantum theory and special relativity, and the relevant doubts brought forward remain unresolved. We posit that the existence of discontinuity points and quantum wormholes would imply superluminal phenomenon or infinite speed of light, which provides for an important supplement to the invariance principle of the speed of light and superluminal phenomena. This can potentially resolve the inconsistency between special relativity and quantum theory.

关键词： Invariance Principle of the Speed of light Superluminal Phenomena Uncertainty Principle Quantum Nonlocality Quantum Wormholes

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N掺杂ZnO纳米线电子结构和稳定性的第一性原理计算

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硅酸盐学报 2013年第12期41卷 1697-1703页

作者：付艳花李远洁西安交通大学电子与信息工程学院西安710049

基于密度泛函理论第一性原理的方法计算了N掺杂ZnO纳米线的形成能、能带结构和态密度。研究了N掺杂浓度和N原子替换掺杂位置对ZnO纳米线结构的稳定性和能带结构的影响。计算结果表明,未掺杂的ZnO纳米线为直接带隙半导体,理论计算的带隙... 详细信息

基于密度泛函理论第一性原理的方法计算了N掺杂ZnO纳米线的形成能、能带结构和态密度。研究了N掺杂浓度和N原子替换掺杂位置对ZnO纳米线结构的稳定性和能带结构的影响。计算结果表明,未掺杂的ZnO纳米线为直接带隙半导体,理论计算的带隙值为1.74 eV。当N掺杂的摩尔分数为2.08%(1个N原子掺杂)时,N替换ZnO纳米线第一层最外层位置处的O原子时,体系形成能最低,为4.398 eV,纳米线结构最为稳定;而当N掺杂的摩尔分数为4.16%(2个N原子掺杂)时,N替换ZnO纳米线第一层最外层和中心位置处的O原子时体系形成能最低,为8.508 eV,纳米线结构最为稳定。此外,两种N掺杂的ZnO纳米线分别在价带顶上方0.49 eV和0.63 eV处形成N杂质能级,1个N原子掺杂的纳米线结构比2个N原子掺杂的纳米线结构具有更浅的N杂质能级。因此,低N掺杂量更容易对ZnO纳米线结构进行p型掺杂,从而为实现p型N掺杂ZnO纳米线提供理论分析依据。

关键词：第一性原理氮掺杂氧化锌纳米线能带结构形成能

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