检索结果-南通市图书馆

Optimized composition for bonding assistant coat in carbon steel sandwich panels

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2007年第1期14卷 41-45页

作者： Jing liu Jingtao han Materials Science and Engineering School University of Science and Technology Beijing Beijing 100083 China

On the basis of the alloying theory of bonding assistant coat （BAC）, taking into account of the interaction of alloy elements, the regressive equation, which relates the wetting ability of bonding assistant coat with the contents of Mn, Ni, Si, Sn, and B, was es- tablished by using quadratic regression orthogonal design of five factors. The influence of elements and their interaction on the wetting ability was analyzed. The ranges of alloy elements were optimized. The melting point of bonding assistant coat was measured by using differential thermal analysis. The results show that the interactions of Ni and Mn, Ni, and Sn can increase the wetting ability obviously and the melting point of bonding assistant coat has been decreased.

关键词： bonding assistant coat (BAC) alloy quadratic regression wetting ability

Biological Properties of Chitosan Films with Different Degree of Deacetylation

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2008年第5期24卷 700-708页

作者： Jing ChanG Wanshun liu Baoqin han Bing liu Department of Marine Life Science Ocean University of China Qingdao 266003 China

Chitin and chitosan films were prepared by solution casting method. Chitosan specimens used in this study were deacetylated by 50.4%, 69.2%, 85.5% and 96.3%. Their water content, protein adhesion ability, cytocompatibility, cell adhesion ability, in vitro and vivo degradability and biocompatibility were evaluated. Results indicated that with the degree of deacetylation （DD） between 50% and 70%, the chitosan showed higher water content. The higher the DD, the stronger protein adhesion ability the chitosan had. All the films have good cytocompatibility and the films with higher DD have better cell adhesion ability. Chitin films degraded more rapidly than others, which disappeared in 2 to 4 weeks after they were implanted in subcutaneous tissue and musculature. Their inflammatory reaction became weaker as the films degraded. As the DD got higher, the films degraded slower. The films of DD 85.5% and DD 90.3% even didn＇t disappeared in 12 weeks after they were implanted. Their inflammatory reaction was mild at the beginning of degradation, and became severe in 4 to 8 weeks, then weaken at last. This basic result can be very helpful for tissue engineering.

关键词： Chitosan Degree of deacetylation Biodegradability Cytocompatibility Celladhesion ability Biocompatibility

Vortex-lines motion for the Ginzburg-Landau equation with impurity

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2007年第12期50卷 1705-1734页

作者： Zu-han liu Department of Mathematics Xuzhou Normal University Xuzhou 221116 China

In this paper, we study the asymptotic behavior of solutions of the Ginzburg-Landau equation with impurity. We prove that, asymptotically, the vortex-lines evolve according to the mean curvature flow with a forcing te... 详细信息

关键词： mean curvature flow, vortices, geometric measure theory, Ginzburg-Landau equations

Time Synchronized Velocity Error for Trajectory Compression

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2022年第2期130卷 1193-1219页

作者： Haibao Jiang Dezhi han han liu Jiuzhang han Wenjing Nie College of Information Engineering ShanghaiMaritime UniversityShanghai201306China College of Foreign Language ShanghaiMaritime UniversityShanghai201306China

Nowadays,distance is usually used to evaluate the error of trajectory *** methods can effectively indicate the level of geometric similarity between the compressed and the raw trajectory,but it ignores the velocity error in the *** fill the gap of these methods,assuming the velocity changes linearly,a mathematical model called SVE(Time Synchronized Velocity Error)for evaluating compression error is designed,which can evaluate the velocity error effectively,conveniently and *** on this model,an innovative algorithm called SW-MSVE(Minimum Time Synchronized Velocity Error Based on Sliding Window)is proposed,which can minimize the velocity error in trajectory compression under the premise of local *** elaborate experiments are designed to demonstrate the advancements of the SVE and the SW-MSVE *** the first experiment,we use the PED,the SED and the SVE to evaluate the error under four compression algorithms,one of which is the SW-MSVE *** results show that the SVE is less influenced by noise with stronger performance and more *** the second experiment,by marking the raw trajectory,we compare the SW-MSVE algorithm with three others algorithms at information *** results show that the SW-MSVE algorithm can take into account both velocity and geometric structure constraints and retains more information of the raw trajectory at the same compression ratio.

关键词： Trajectory compression error evaluation trajectory data time synchronization velocity compression ratio

Uncertainty Analysis for Ship-Bank Interaction Tests in A Circulating Water Channel

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Ocean Engineering 2020年第3期34卷 352-361页

作者： liu han MA Ning GU Xie-chong School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai Jiao Tong UniversityShanghai 200240China

This paper presents a systematic model test program to assess the uncertainty of the ship-bank interaction forces,using the planar motion mechanism(PMM)system in a circulating water channel(CWC).Therefore,the uncertainties due to ship-bank distance and water depth are considered,and they are calculated via the partial differentials of the regression formulae based on the test *** general part of the uncertainty analysis(UA)is performed according to the ITTC recommended procedure 7.5-02-06.04,while the uncertainty of speed is identified as the bias limit due to the flow velocity maldistribution in the *** each example test for the UA of ship-bank interaction forces,12 repeated measurements were *** from the UA show that the contribution of water depth error and flow velocity maldistribution to the total uncertainty is noticeable,and the paper explains how they increase with the change of the test *** present study will be useful in understanding the uncertainty regarding the ship-bank interaction force measurement in a CWC.

关键词： ship-bank interaction test uncertainty analysis circulating water channel bias limit ship-bank distance

Reducing congestion and emissions via roadside unit deployment under mixed traffic flow

在线全文

学校读者我要写书评

暂无评论

International Journal of Coal Science & Technology 2023年第1期10卷 197-211页

作者： Yuhao liu Zhibin Chen Siyuan Gong han liu Shanghai Key Laboratory of Urban Design and UrbanScience NYU ShanghaiShanghaiChina Division of Engineering and Computer Science NYUShanghaiShanghaiChina The Joint Laboratory for Internet of Vehicles Ministryof Education-China Mobile Communications CorporationXi’anShaanxiChina School of Information Engineering Chang’an UniversityXi’anShaanxiChina Central Research Institute China Coal Technologyand Engineering Group(CCTEG)BeijingChina

It is expected that for a long time the future road trafc will be composed of both regular vehicles(RVs)and connected autonomous vehicles(CAVs).As a vehicle-to-infrastructure technology dedicated to facilitating CAV under the mixed trafc fow,roadside units(RSUs)can also improve the quality of information received by CAVs,thereby infuencing the routing behavior of CAV *** paper explores the possibility of leveraging the RSU deployment to afect the route choices of both CAVs and RVs and the adoption rate of CAVs so as to reduce the network congestion and *** this end,we frst establish a logit-based stochastic user equilibrium model to capture drivers’route choice and vehicle type choice behaviors provided the RSU deployment plan is ***,CAV users’perception error can be reduced by higher CAV penetration and denser RSUs deployed on the road due to the improved information *** the established equilibrium model,the RSU deployment problem is then formulated as a mathematical program with equilibrium *** active-set algorithm is presented to solve the deployment problem *** results suggest that an optimal RSU deployment plan can efectively drive the system towards one with lower network delay and emissions.

关键词： Roadside unit deployment Connected autonomous vehicle Information quality Congestion and emission

Challenges of Big Data analysis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2014年第2期1卷 293-314页

作者： Jianqing Fan Fang han han liu Department of Operations Research and Financial Engineering Princeton University Department of Biostatistics Johns Hopkins University

Big Data bring new opportunities to modern society and challenges to data scientists. On the one hand,Big Data hold great promises for discovering subtle population paterns and heterogeneities that are not possible with small-scale data. On the other hand, the massive sample size and high dimensionality of Big Data introduce unique computational and statistical challenges, including scalability and storage botleneck, noise accumulation, spurious correlation, incidental endogeneity and measurement *** challenges are distinguished and require new computational and statistical paradigm. his paper gives overviews on the salient features of Big Data and how these features impact on paradigm change on statistical and computational methods as well as computing architectures. We also provide various new perspectives on the Big Data analysis and computation. In particular, we emphasize on the viability of the sparsest solution in high-conidence set and point out that exogenous assumptions in most statistical methods for Big Data cannot be validated due to incidental endogeneity. hey can lead to wrong statistical inferences and consequently wrong scientiic conclusions.

关键词： Big Data noise accumulation spurious correlation incidental endogeneity data storage scalability

Unified plastic modulus in the bounding surface plasticity model

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2016年第6期59卷 932-940页

作者： XIAO Yang liu han Long liu Hong SUN Yi Fei State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing University College of Civil Engineering Chongqing University Faculty of Engineering and Information Sciences University of Wollongong

A unified plastic modulus parameter for the bounding surface plasticity model is introduced in order to maintain the identical responses of modeling for both the two-dimensional and three-dimensional stress space with the same model parameters. Also discussed are the influences of the plastic modulus parameter on the stress-strain relationship and the plastic modulus. The model is more sensitive in modeling the stress strain responses when the plastic modulus parameter is small. The plastic modulus parameter has a great influence on the magnitude of the plastic modulus, especially at the initial loading stage. The plastic modulus asymptotically tends to zero at the end of loading.

关键词： bounding surface strength criterion plastic modulus dilatancy peak-stress ratio

Mechanical and Barrier Properties of Epoxy/ultra-short Glass Fibers Composite Coatings

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2012年第12期28卷 1077-1084页

作者： Yongsheng Hao Fuchun liu En-Hou han State Key Laboratory for Corrosion and Protection Institute of Metal Research Chinese Academy of Sciences Shenyang110016 China

Epoxy coatings containing different volume fractions of ultra-short glass fibers were prepared successfully. Ultra-short glass fiber not only can improve the hardness, adhesion of the coating, and glass transition tem-perature （Tg）, but also can decrease the coefficient of thermal expansion （CTE） of the coating. Electrochemical impedance spectroscopy （EIS） was used to evaluate the barrier properties of the coatings containing different volume fractions of ultra-short glass fibers. The EIS results showed that the coating had the best barrier property when it contained 20% （volume fraction） ultra-short glass fibers. The functions of the ultra-short glass fibers in epoxy coating are two fold： first, they can improve the coating mechanical properties as reinforcement materials; second, they parallel to the substrate and inhibit the corrosive medium to pass through the coating.

关键词： Glass fiber Barrier Electrochemical impedance spectroscopy Thermal expansion