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Science China(Information Sciences) 2022年第3期65卷 110-122页

作者： Dong wang zhu wang Zhaojing WU Wei wang Key Laboratory of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education Dalian University of Technology School of Mathematics and Informational Science Yantai University School of Control Science and Engineering Dalian University of Technology

In this paper, we investigate the distributed convex optimization problem for a class of nonlinear multi-agent systems disturbed by random noise over a directed graph. The target problem involves designing a continuous-time algorithm to minimize the sum of all local cost functions associated with each agent. The target noise is considered as a second-order stationary process under mild assumptions. The noise-to-state exponential stability for the multi-agent system based on random differential equations is analyzed using a random field method. Sufficient conditions corresponding to the second moment relative to the optimal solution in the form of matrix inequalities are established. Then, the grid search method is employed to determine the best system parameters such that the second moment of the estimation error has the minimum value. In addition, the obtained results are applied to solve the average consensus problem in the presence of a stationary process. Finally, a numerical example is presented to verify the effectiveness of the proposed algorithm.

关键词： distributed optimization random differential equations stationary process noise-to-state exponential stability

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Association between T174M polymorphism in the angiotensinogen gene and risk of coronary artery disease: a meta-analysis

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Journal of Geriatric Cardiology 2013年第1期10卷 59-65页

作者： Wen-zhu wang Department of Neurology Saint Petersburg Pavlov State Medical University St. Petersburg 197022 Russia

Background Angiotensinogen (AGT) T174M gene polymorphism has been suggested to be linked to risk of coronary artery disease, however, results from studies of this association have been inconsistent. In this study, we assess the relationship between AGT T174Mgene polymorphism and coronary artery disease. Methods We conducted a meta-analysis of 18 case-control studies with 8,147 coronary artery disease cases and 5,344 controls in Google scholar, PubMed, Cochrane Library and China National Knowledge Infrastructure (CNKI) databases to identify eligible studies published by July, 2012. Odds ratios (OR) and 95% confidence intervals (95% CI) were calculated from these studies. Results Overall, a significant association was found between angiotensinogen T174M polymorphism and coronary artery disease risk when all studies were pooled into the meta-analysis (TT vs. MM:OR = 0.53, 95%CI = 0.40–0.71; dominantmodel: OR = 1.16,95% CI = 1.01–1.35; recessive model: OR = 0.54, 95% CI = 0.40–0.72). In a stratified analysis, the results indicate a significant association in Caucasians suffering from coronary stenosis (TT vs. MM: OR = 0.38, 95% CI = 0.23–0.63; recessive model: OR = 0.39, 95% CI =0.23–0.64). No significant increased risk for coronary artery disease was found in Asians. Conclusions The meta-analysis indicate a significant association of T174Mpolymorphism with coronary stenosis risk in Caucasians.

关键词： Angiotensinogen Coronary artery disease Meta-analysis Polymorphism

Resistant effect of non-equilibrium inter-particle collisions on dense solids transport

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Particuology 2010年第6期8卷 544-548页

作者： Chao zhu Dawei wang Department of Mechanical and Industrial Engineering NewJersey Institute of Technology Newark NJ 07102 USA

There exist big gaps between measurements and modeling predictions on solids holdup and pressure drop in dense solids transport, such as those occuring in the bottom sections of gas-solids risers. The inability of closing this gap by common modeling approaches indicates certain missing and/or misrepresentation of some controlling mechanisms in modeling the transport. Previous research efforts show that the gap can not be effectively narrowed by simply modifying the drag force formulations without inclusion of the collision effect. This paper explores the origin of some controlling mechanisms that might have been overlooked in previous modeling approaches, and recommends how to make the model dense solids transport better. Our analysis shows the presence of a resistant force arising from inter-particle collision when the solids are accelerated in dense-phase transport. This may be caused by non-equilibrium collision during solids acceleration, which differs from local-equilibrium assumptions on which the current kinetic theory modeling of granular particles is based. A complete modeling of this collision-induced resistance calls for a total revision of the kinetic theory, with the inclusion of non-equilibrium collisions and offcenter collisions in dense solids transport.

关键词： Dense solids transport Inter-particle collision Non-equilibrium collisions Resistant effect

Nonlinear stability of sensor elastic element--corrugated shallow spherical shell in coupled multi-field

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Applied Mathematics and Mechanics(English Edition) 2017年第6期38卷 877-888页

作者： Yongan zhu Fan wang Renhuai LIU Institute of Applied Mechanics Jinan University Guangzhou 510632 China Key Laboratory of Disaster Forecast and Control in Engineering of Ministry of Education Jinan University Guangzhou 510632 China

Nonlinear stability of sensor elastic element- corrugated shallow spherical shell in coupled multi-field is studied. With the equivalent orthotropic parameter obtairled by the author, the corrugated shallow spherical shell is considered as an orthotropic shallow spherical shell, and geometrical nonlinearity and transverse shear deformation are taken into account. Nonlinear governing equations are obtained. The critical load is obtained using a modified iteration method. The effect of temperature variation and shear rigidity variation on stability is analyzed.

关键词： modified iteration method corrugated shallow spherical shell multi-field,stability critical load temperature variation

Estimating posterior inference quality of the relational infinite latent feature model for overlapping community detection

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Frontiers of Computer Science 2020年第6期14卷 55-69页

作者： Qianchen YU Zhiwen YU zhu wang Xiaofeng wang Yongzhi wang School of Computer Science and Engineering Northwestern Polytechnical UniversityXi’an 710072China Shanxi Provincial Key Laboratory for Embedded System Xi'an 710072China College of Computer Science and Engineering North Minzu UniversityYinchuan 750021China College of Earth Exploration Science and Technology Jilin UniversityChangchun 130025China

Overlapping community detection has become a very hot research topic in recent decades,and a plethora of methods have been ***,a common challenge in many existing overlapping community detection approaches is that the number of communities K must be predefined *** propose a flexible nonparametric Bayesian generative model for count-value networks,which can allow K to increase as more and more data are encountered instead of to be fixed in *** Indian buffet process was used to model the community assignment matrix Z,and an uncol-lapsed Gibbs sampler has been ***,as the community assignment matrix Zis a structured multi-variable parameter,how to summarize the posterior inference results andestimate the inference quality about Z,is still a considerable challenge in the *** this paper,a graph convolutional neural network based graph classifier was utilized to help tosummarize the results and to estimate the inference qualityabout *** conduct extensive experiments on synthetic data and real data,and find that empirically,the traditional posterior summarization strategy is reliable.

关键词： graph convolutional neural network graph classification overlapping community detection nonparametric Bayesian generative model relational infinite latent feature model Indian buffet process uncollapsed Gibbs sampler posterior inference quality estimation

Sorting Semiconducting Single-Walled Carbon Nanotubes by Water-Soluble Polyfluorene Assisted Electrophoresis and Its Application in Field-effect Transistors

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Chinese Journal of Chemistry 2015年第7期33卷 756-764页

作者： Haoyun zhu Weizhi wang State Key Laboratory of Molecular Engineering of Polymers Collaborative Innovation Center of Polymers and Polymer Composite Materials Department of Maeromoleeular Science Fudan University Shanghai 200433 China

We report a considerably promising method based on agarose gel electrophoresis （AGE） to separate single-walled carbon nanotubes by adding a water-soluble polyfluorene （w-PFO） as surfactant into the agarose gel. In this effective method, the AGE/w-PFO gel network will trap more semiconducting single-walled carbon nanotubes （SWNTs） with the assistance ofw-PFO, for the strong interaction between w-PFO and semiconducting species. The optical absorbance, photoluminescence emission and resonant Raman scattering characterization were used to ver- ify the separation effect. The purity of separated semiconducting species is as high as （98±1）%. The demonstrated field effect transistors give the on/off ratio and mobility about 27000 and 10.2 cm^2·V^-1·s^-1, respectively.

关键词： agarose gel electrophoresis field effect transistors semiconducting single-walled carbon nanotubes water-soluble polyfluorene

A D-optimal Multi-position Calibration Method for Dynamically Tuned Gyroscopes

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Chinese Journal of Aeronautics 2011年第2期24卷 210-218页

作者： FU Li zhu Yongquan wang Lingling wang Xinling School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China

This paper presents a novel experimental design to greatly improve the calibration accuracy of the acceleration-insensitive bias and the acceleration-sensitive bias of the dynamically tuned gyroscopes（DTGs）.In order to reduce experimental cost,the D-optimal criteria with constraints are *** turntable positions and the number of test points are chosen to build D-optimal experimental *** D-optimal experimental designs are tested by multi-position calibration experiment for tactical-grade *** results show that,with the same cost,the fit uncertainty is reduced by about 50% by using the D-optimal 8-position experimental procedure,compared to using a defacto standard experimental procedure in ANSI/IEEE Std ***,the new experimental procedure almost achieves optimal accuracy with only 12-position which is half the cost of the widely adopted 24-position experimental procedure for achieving optimal accuracy.

关键词： optimization methods calibration gyroscopes error compensation design for testability

Study on constructive system of green cave dwelling in Loess Plateau—Interpretation with the “regional gene” theory

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第11期8卷 1754-1761页

作者： wang zhu WEI Qin HE Yong Department of Architecture Zhejiang University Hangzhou 310058 China Department of Architecture Shanghai University Shanghai 200444 China

This article reveals the inherent evolution adjusting mechanism of regional architecture by means of considering the concept and method of "regional gene" as the research approach of regional architecture construction system, and in the mean- while establishes the "gene database" of regional architecture and optimum technology, on the basis of the principle of sustainable development and scientific evaluation system. In addition, this article chooses the planning of model villages of cave dwellings in Loess Plateau and the construction of ecological cave dwellings for case study to prove the feasibility of the research approach.

关键词： Regional architecture construction system Regional gene Primordial cave dwellings Green cave dwelling Sus tainable development

Comparison of engineering failures and seismic responses of 500 kV transformer-bushing systems in the 2022 Luding earthquake

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Earthquake Engineering and Engineering Vibration 2024年第4期23卷 1029-1041页

作者： zhu wang Wu Ming’er Xie Qiang Department of Structural Engineering Tongji UniversityShanghai 200092China Key Laboratory of Performance Evolution and Control for Engineering Structures(Tongji University) Shanghai 200092China

Cemented and mechanically clamped types of end fittings(fitting-C and fitting-M)are commonly used in transformer *** the Luding Ms 6.8 earthquake that occurred in China on September 5,2022,all transformer bushings with the two types of end fittings in a 500 kV substation were ***-earthquake field investigations were conducted,and the failures of the two types of bushings were *** elementary simulation models of the transformer-bushing systems were developed to simulate the engineering failures,and further compute their seismic responses for *** results indicate that the hitch lugs of the connection flange are structurally harmful to seismic ***-M can decrease the bending stiffness of the bushing due to the flexible sealing rubber *** it provides a more flexible connection that dissipates energy,the peak accelerations and relative displacements at the top of the bushing are significantly lower than those of the bushing with *** with fitting-C,fitting-M transfers the high-stress areas from the connection flange to the root of the porcelain,so the latter becomes the most vulnerable ***-M increases the failure risk of the low-strength porcelain,indicating the unsuitability of applying it in high-intensity fortification regions.

关键词： transformer bushing end fitting Luding earthquake,engineering failure seismic responses

Eutrophication: a limiting nutrient is not necessarily an abating factor

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Science Bulletin 2019年第16期64卷 1125-1128页

作者： Hong-zhu wang Hai-Jun wang State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences

Eutrophication and algal blooms are a global environmental problem. In terms of nutrient control of eutrophic waters, there is still a heated debate on reducing P only or both P and N [1–3].The core question is whether algal communities are P-limited or N-limited or co-limited;the basic assumption is that limiting nutrients are those which should be reduced (2)But, is the assumption really true?The law of limiting factors (so-called Liebig’s Law of the Minimum) was first formed by Sprengel in 1828 in essence. He stated:

关键词： a limiting nutrient factor Eutrophication