4篇
您的检索式：作者名="Chunfa Zhao"
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| 1 | Temperature-induced deformation of CRTS II slab track and its effect on track dynamical properties显示文摘Two finite-element models of the CRTS II slab track are presented to simulate temperature-induced deformations of the concrete track slab with no deterioration or with a deteriorated cement asphalt mortar(CAM).One model,which considers the fully bonding interface between the slab and the CAM layer,could applied to a track that is in good condition;the other model uses cohesive zone elements to simulate the deteriorated CAM with some possible interfacial separation and slip.Utilizing both of the models,temperature-induced warp deformations of track under various temperature loads are investigated.The influence of temperature deformation on the dynamic properties of the track is analyzed based on the train-track coupled dynamics.Numerical results show that the deteriorated CAM layer can significantly increase temperature deformations of a CRTS II track slab,which would produce tiny rail irregularities.There are clear differences between the deformation shapes of the track slabs that have an inseparable mortar layer and those have a separable mortar layer.The track slab with a deteriorated mortar layer showed more open curl distortion than the track slab in good condition.The dynamical response index of the slab track is intensified to a certain level due to the temperature deformation;with an increase of the train speed,the track dynamical responses increased linearly.However,rail irregularities due to the temperature deformations are very tiny.Even if a track is exposed to extreme temperature loads and the mortar layer is deteriorated,temperature deformation can have a negligible effect on the track’s dynamical properties. | SONG XiaoLin ZHAO ChunFa ZHU XiaoJia | 2014 | Science China(Technological Sciences)2014，57，10： | 8 |
| 2 | Discrete element modelling of railway ballast performance considering particle shape and rolling resistance显示文摘To simulate ballast performance accurately and efficiently,the input in discrete element models should be carefully selected,including the contact model and applied particle shape.To study the effects of the contact model and applied particle shape on the ballast performance(shear strength and deformation),the direct shear test(DST)model and the large-scale process simulation test(LPST)model were developed on the basis of two types of contact models,namely the rolling resistance linear(RRL)model and the linear contact(LC)model.Particle shapes are differentiated by clumps.A clump is a sphere assembly for one ballast particle.The results show that compared with the typical LC model,the RRL method is more efficient and realistic to predict shear strength results of ballast assemblies in DSTs.In addition,the RRL contact model can also provide accurate vertical and lateral ballast deformation under the cyclic loading in LPSTs. | Yunlong Guo Chunfa Zhao Valeri Markine Can Shi Guoqing Jing Wanming Zhai | 2020 | Railway Engineering Science2020，28，4： | 4 |
| 3 | A Modern Method for Analyzing Thermal Energy System with System State Equation and Analytical Formula of Performance Index显示文摘这份报纸探讨开火煤的电源联合起来的全面表演分析。从系统工程的观点,热植物系统的一个一般蒸气水分发方程被介绍。这个系统状态方程是联合系统的准确表情拓扑的结构和系统性质。通过合适的数学变换,在主要系统和辅助系统之间的内部关系和相互作用被揭示,它的一般形式被给。为热发电厂的热消费率的一个分析公式是方程的一直接水果,它极大地便于复杂热系统的联机分析并且优化。在获得技术的现代数据的帮助下,新途径基于热力学的第一条法律是传统的分析方法的完美的扩展。 | Chunfa ZHANG Liping LI Huijie WANG Ning ZHAO | 2007 | Journal of Thermal Science2007，16，1： | 1 |
| 4 | Functionalizing DNA nanostructures with natural cationic amino acids显示文摘Complexing self-assembled DNA nanostructures with various functional guest species is the key to unlocking new and exciting biomedical applications.Cationic guest species not only induce magnesium-free DNA to self-assemble into defined structures but also endow the final complex nanomaterials with new properties.Herein,we propose a novel strategy that employs naturally occurring cationic amino acids to induce DNA self-assembly into defined nanostructures.Natural L-arginine and L-lysine can readily induce the assembly of tile-based DNA nanotubes and DNA origami sheets in a magnesium-free manner.The self-assembly processes are demonstrated to be pH-and concentration-dependent and are achieved at constant temperatures.Moreover,the assembled DNA/amino acid complex nanomaterials are stable at a physiological temperature of 37◦C.Substituting L-arginine with its D form enhances its serum stability.Further preliminary examination of this complex nanomaterial platform for biomedical applications indicates that DNA/amino acids exhibit distinct cellular uptake behaviors compared with their magnesium-assembled counterparts.The nanomaterial mainly clusters around the cell membrane and might be utilized to manipulate molecular events on the membrane.Our study suggests that the properties of DNA nanostructures can be tuned by complexing them with customized guest molecules for a designed application.The strategy proposed herein might be promising to advance the biomedical applications of DNA nanostructures. | Dong Wang Chunfa Chen Qian Liu Qianwen Zhao Di Wu Yue Yuan Chaowang Huang Xiaorong Sun Chunji Huang David Tai Leong Guansong Wang Hang Qian | 2021 | Bioactive Materials2021，6，9： | 0 |
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