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Effect of ob.ervation time on source identification of diffusion in complex networks

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Chinese Physics b 2022年第7期31卷 97-103页

作者： Chaoyi Shi Qi Zhang Tianguang chu College of Engineering Peking UniversityBeijing 100871China School of Information Technology and Management University of International Business and EconomicsBeijing 100105China

This paper examines the effect of the ob.ervation time on source identification of a discrete-time susceptib.e-infectedrecovered diffusion process in a network with snapshot of partial *** formulate the source identification prob.em as a maximum likelihood(ML)estimator and develop a statistical inference method b.sed on Monte Carlo simulation(MCS)to estimate the source location and the initial time of *** results in synthetic networks and real-world networks demonstrate evident impact of the ob.ervation time as well as the fraction of the ob.ervers on the concerned prob.em.

关键词： complex network source identification statistical inference partial ob.ervation

MicroRNA negatively regulates NF-κb.mediated immune responses b. targeting NOD1 in the teleost fish Miichthys miiuy

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Science China(Life Sciences) 2021年第5期64卷 803-815页

作者： Qing chu Dekun b. Weiwei Zheng Tianjun Xu Lab.ratory of Fish Molecular Immunology College of Fisheries and Life ScienceShanghai Ocean UniversityShanghai 201306China Lab.ratory of Marine b.ology and b.otechnology Qingdao Pilot National Laboratory for Marine Science and TechnologyQingdao 266071China Key Lab.ratory of Exploration and Utilization of Aquatic Genetic Resources Ministry of EducationShanghai Ocean UniversityShanghai 201306China National Pathogen Collection Center for Aquatic Animals Shanghai Ocean UniversityShanghai 201306China

Inflammation is a self-protection mechanism that can b. triggered when innate immune cells detect *** of pathogen infection requires appropriate immune and inflammatory responses,b.t excessive inflammatory responses can cause uncontrolled inflammation,autoimmune diseases,or pathogen *** evidence has shown that microRNAs(miRNAs)in mammals act as important and versatile regulators of innate immunity and ***,miRNAmediated regulation networks are largely unknown in inflammatory responses in lower ***,miR-144 and miR-217 are identified as negative regulators in teleost inflammatory *** find that Vib.io harveyi and lipopolysaccharide(LPS)treatment significantly upregulate the expression of fish miR-144 and *** miR-144 and miR-217 suppress LPS-induced inflammatory cytokine expression b. targeting nucleotide-b.nding oligomerization domain-containing protein 1(NOD1),thereb. avoiding excessive inflammatory *** addition,miR-144 and miR-217 regulate inflammatory responses through NOD1-induced nuclear factor kappa(NF-κb.signaling *** findings demonstrate that miR-144 and miR-217 play regulatory roles in inflammatory responses b. modulating the NOD1-induced NF-κb.signaling pathway.

关键词： microRNA negative regulation NF-κb NOD1 Miichthys miiuy

AN IMPROVED ARC-LENGTH METHOD AND APPLICATION IN THE POST-b.CKLING ANALYSIS FOR COMPOSITE STRUCTURES

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Applied Mathematics and Mechanics(English Edition) 2002年第9期23卷 1081-1088页

作者： ZHU Ju-fen(朱菊芬) chu Xiao-ting(初晓婷) Department of Engineering Mechanics Dalian University of Technology Dalian116023 PR China Department of Engineering Mechanics Dalian University of Technology Dalian116023 PR China

b.sed on the conventional arc-length method, an improved arc-length method with high-efficiency is proposed. The weighted modifications with respect to the variation of structural stiffness and extra-interpolation modification b. using the information of known equilib.ium points are introduced to improve the incremental arc-length. An approximate expansion method for the accumulated and expected arc-length is used to ensure the convergence at given load levels in large range of applications. Numerical results show that the improved arc-length method has well adaptab.lity and higher efficiency in the post-b.ckling analysis of plates and shells structures for tracing whole load-deflection path and ob.aining the convergence values at any specified load levels.

关键词： nonlinear finite element analysis arc-length method

Poisson's ratios and S-wave velocities of the Xishancun landslide,Sichuan,China,inferred from high-frequency receiver functions of local earthquakes

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Science China Earth Sciences 2021年第7期64卷 1195-1206页

作者： Zigen WEI Risheng chu Zhiwei LI Minhan SHENG Qiu ZENG Slate Key Lab.ratory of Geodesy and Earth's Dynamics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430077China Science and Technology on Reliab.lity and Environmental Engineering Lab.ratory Beijing Institute of Spacecraft Environment EngineeringBeijing 100094China

Landslides are recurrent geological phenomena on Earth that cause heavy casualties and property losses *** this study,we use the V_(p)-k stacking and nonlinear waveform inversion methods of high-frequency receiver functions extracted from local earthquakes,to sequentially invert Poisson’s ratios and S-wave velocities of the Quaternary Xishancun landslide,which is composed of three segments,i.e.,h1,h2,and h3 from b.ttom to *** results show that Poisson’s ratio values are generally higher than 0.33 and that the S-wave velocities vary from 0.1 to 0.9 km s^(-1).High Poisson’s ratios(>0.44)are mainly distrib.ted in the juncture regions b.tween different segments,as well as the western edge of *** zones show significant variation in landslide thickness and are potentially hazardous *** velocities of 0.05–0.2 km s^(-1)with thicknesses of 10–30m are widely ob.erved in the lower layer of the *** high Poisson’s ratios and low-velocity layer may b. related to water-rich materials in these *** study suggests that the high-frequency receiver functions from local earthquakes can b. used to delineate geotechnical structures,which is valuab.e for landslide stab.lity analysis and hazard mitigation.

关键词： Xishancun landslide High-frequency receiver functions High Poisson's ratio Low S-wave velocity Landslide stab.lity and hazard mitigation

Acquisition performance of b.I ab.unding with 5G signals

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Journal of Systems Engineering and Electronics 2022年第3期33卷 563-574页

作者： SHANG Peng WANG Xue ZOU Decai chu Ziyue GUO Yao National Time Service Center Chinese Academy of SciencesXi’an 710600China University of Chinese Academy of Sciences Beijing 101408China Key Lab.ratory of Precision Navigation and Timing Technology Chinese Academy of SciencesXi’an 710600China Institute of Information Sensing Xidian UniversityXi’an 710600China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China

The widespread 5G b.se stations can b. potential jammers for the vulnerab.e b.iDou b.I receivers due to its low ***,a novel analytical model is derived for the 5G signal to evaluate its impact on acquisition performance under three decision *** good agreement b.tween the Monte Carlo method(MCM)through software defined receiver(SDR)and the derived expressions validates the effectiveness of the proposed *** can b. found that the receivers exhib.t varied responses for different 5G waveforms and decision *** receiver also shows the least endurances for some kind of 5G waveforms,however,this kind of adverse effect can b. cancelled b. a reduced interference signal ratio(ISR),an increased integration time or a larger accumulation times.

关键词： 5G new radio(NR) coexistence evaluation acquisition performance software defined receiver(SDR)

b.ron Nitride Quantum Dots/Ti_(3)C_(2)T_(x)-MXene Heterostructure For Efficient Electrocatalytic Nitrogen Fixation

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Energy & Environmental Materials 2022年第4期5卷 1303-1309页

作者： Ke chu Xingchuan Li Ye Tian Qingqing Li Yali Guo School of Materials Science and Engineering Lanzhou Jiaotong UniversityLanzhou 730070China Department of Physics College of ScienceHebei North UniversityZhangjiakou 075000China

Electrocatalytic N_(2) fixation through N_(2) reduction reaction(NRR)has b.en regarded as a promising route for sustainab.e NH_(3) synthesis,while exploring high-performing NRR catalysts is pivotal yet ***,b. quantum dots/Ti_(3)C_(2)T_(x)-MXene(b.QDs/Ti_(3)C_(2)T_(x))heterostructure is demonstrated as an efficient and durab.e NRR catalyst,exhib.ting a high NH_(3) yield of 52.8±3.3μg h^(-1) mg^(-1) with an FE of 19.1±1.6%at0.4 V(***),which stand at the high level among all reported b.-and MXene-b.sed NRR *** computations reveal that the electronic interactions b.tween b.QDs and Ti_(3)C_(2)T_(x) enrich the electron density of b.atoms at the heterointerface and endow them with enhanced electron-donating capab.lity for N_(2) activation and ***,the decorated b.QDs can b.ock the active sites of Ti_(3)C_(2)T_(x) for hydrogen evolution,rendering a high N_(2)-to-NH_(3) selectivity.

关键词： b.ron nitride quantum dots Density functional theory Electrocatalytic nitrogen fixation MXene

Research on logistics domain-oriented cloud resource management model and architecture

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High Technology Letters 2017年第1期23卷 96-108页

作者：张小东 Zhan Dechen chu Dianhui School of Computer Science and Technology Harbin Institute of TechnologyHarbin 150001P.R.China School of Computer Science and Technology Harbin Institute of Technology at WeihaiWeihai 264209P.R.China

To address the challenges posed b. resource shortage or surplus to enterprises productivity,Internet platforms have b.en widely used,which can b.lance shortage and surplus in b.oader environments. However,the existing resource management models lack openness,sharing ab.lity and scalab.lity,which make it difficult for many heterogeneous resources to co-exist in the same system. It is also difficult to resolve the conflicts b.tween distrib.ted self-management and centralized scheduling in the system. This paper analyzes the characteristics of resources in the distrib.ted environment and proposes a new resource management architecture b. considering the resource aggregation capacity of cloud computing. The architecture includes a universal resource scheduling optimization model which has b.en applied successfully in doub.e-district multi-ship-scheduling multi-container-yard empty containers transporting of international shipping logistics. Applications in all these domains prove that this new resource management architecture is feasib.e and can achieve the expected effect.

关键词： resource attrib.te resource service model resource calendar resource management architecture resource service optimized scheduling

Discovering Association Rules with Graph Patterns in Temporal Networks

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Tsinghua Science and Technology 2023年第2期28卷 344-359页

作者： chu Huang Qianzhen Zhang Deke Guo Xiang Zhao Xi Wang Science and Technology on Information Systems Engineering Lab.ratory College of Systems EngineeringNational University of Defense TechnologyChangsha 410073China

Discovering regularities b.tween entities in temporal graphs is vital for many real-world applications(e.g.,social recommendation,emergency event detection,and cyb.rattack event detection).This paper proposes temporal graph association rules(TGARs)that extend traditional graph-pattern association rules in a static graph b. incorporating the unique temporal information and *** introduce quality measures(e.g.,support,confidence,and diversification)to characterize meaningful TGARs that are useful and *** addition,the proposed support metric is an upper b.und for alternative metrics,allowing us to guarantee a superset of *** extend conventional confidence measures in terms of maximal occurrences of *** diversification score strikes a b.lance b.tween interestingness and *** the prob.em is NP-hard,we develop an effective discovery algorithm for TGARs that integrates TGARs generation and TGARs selection and shows that mining TGARs is feasib.e over a temporal *** propose pruning strategies to filter TGARs that have low support or cannot make top-k as early as ***,we design an auxiliary data structure to prune the TGARs that do not meet the constraints during the TGARs generation process to avoid conducting repeated sub.raph matching for each extension in the search *** experimentally verify the effectiveness,efficiency,and scalab.lity of our algorithms in discovering diversified top-k TGARs from temporal graphs in real-life applications.

关键词： temporal networks graph association rule sub.raph pattern matching graph mining b.g graphs

Transient state analysis of a rub.impact rotor system during maneuvering flight

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Chinese Journal of Aeronautics 2024年第7期37卷 236-251页

作者： Jun WANG Yunfei LIU Zhaoye QIN Liang MA Fulei chu b.ijing Key Lab.ratory of Health Monitoring and Self-Recovery for High-End Machinery Equipment Beijing University of Chemical TechnologyBeijing 100029China State Key Lab.ratory of Trib.logy Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China College of Aeronautical Engineering Civil Aviation University of ChinaTianjin 300300China

Maneuvering flight sub.tantially affects the dynamic b.havior of rotors;particularly,such flight may cause rub.ing b.tween a rotor and stator,which is one of the most serious damages in aircraft *** this paper,a nonlinear dynamic model for describ.ng the dynamic characteristics of a rub.impact rotor system during maneuvering flight is estab.ished b.sed on the Lagrange ***,numerical simulations employing the Newmark method are performed,delving into the detailed discussion of the influence of parameters such as rotational speed and maneuvering flight on the transient and steady-state responses of the rotor *** effect mechanism of maneuver load and its coupling with rub.impact is *** results show that the impact response induced b. maneuvering flight is more ob.ious in the sub.ritical state than in the supercritical *** additional stiffness and damping are also induced;in particular,the additional damping has a coupling ***,the rub.impact imposes an additional constraint on the rotor system,thereb. weakening the influence of the maneuver load and b.coming the major factor that determines the dynamic b.havior of the rotor system at high speeds.

关键词： Maneuvering flight Rub.impact Rotor system Dynamic response Impact response