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Solutions to Some Open Problems in Fluid Dynamics

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Chinese Annals of Mathematics,Series B 2008年第2期29卷 179-198页

作者： Linghai ZHANG Department of Mathematics Lehigh University 14 East Packer Avenue Bethlehem Pennsylvania 18015

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关键词：流体动力学数学物理方法流体力学方程全局光滑解

Explicit Traveling Wave Solutions to Nonlinear Evolution Equations

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Chinese Annals of Mathematics,Series B 2011年第6期32卷 929-964页

作者： Linghai ZHANG Department of Mathematics Lehigh University 14 East Packer Avenue Bethlehem Pennsylvania 18015 USA

First of all,some technical tools are developed.Then the author studies explicit traveling wave solutions to nonlinear dispersive wave equations,nonlinear dissipative dispersive wave equations,nonlinear convection equ... 详细信息

关键词：非线性发展方程显式行波解非线性反应扩散方程非线性双曲型方程非线性色散对流方程波方程耗散

Seismic performance of steel MRF building with nonlinear viscous dampers

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Frontiers of Structural and Civil Engineering 2016年第3期10卷 254-271页

作者： Baiping DONG James M. RiCLES richard SAUSE ATLSS Engineering Research Center Department of Civil and Environmental Engineering Lehigh University Bethlehem PA 18015 USA

This paper presents an experimental study of the seismic response of a 0.6-scale three-story seismicresistant building structure consisting of a moment resisting frame （MRF） with reduced beam sections （RBS）, and a frame with nonlinear viscous dampers and associated bracing （called the DBF）. The emphasis is on assessing the seismic performance for the design basis earthquake （DBE） and maximum considered earthquake （MCE）. Three MRF designs were studied, with the MRF designed for 100%, 75%, and 60%, respectively, of the required base shear design strength determined according to ASCE 7-10. The DBF with nonlinear viscous dampers was designed to control the lateral drift demands. Earthquake simulations using ensembles of DBE and MCE ground motions were conducted using the real-time hybrid simulation method. The results show the drift demand and damage that occurs in the MRF under seismic loading. Overall, the results show that a high level of seismic performance can be achieved under DBE and MCE ground motions, even for a building structure designed for as little as 60% of the base shear design strength required by ASCE 7-10 for a structure without dampers.

关键词： seismic response steel MRF nonlinear viscous damper design basis earthquake real-time hybrid simulation

Multi-Source Multihop Wireless Networks:A Trellis Representation and Network Coding

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Multi-Source Multihop Wireless Networks:A Trellis Representa...

Optical Manipulation and Mechanical Characterization of individual Biomolecules

2008 iEEE international Conference on Communications(iCC 2008)

作者： Jing Li (Tiffany) and Meng Yu Lehigh University ECE Department bethlehem PA 18015

We consider practical network coding,a useful generalization of routing,in a dynamic wireless network comprising a set of nodes transmitting data wirelessly to a set of common destinations.it is shown that an arbitrary network can be transformed to a "trellis network",such that routing becomes equivalent to path discovery in the trellis.Exploiting a distributed,real-time matching-code-with-graph technique in each stage of the possibly time-varying trellis,a general network coding framework is developed.Depending on whether or not decoding is performed at the intermediate relays,three practical network coding categories,progress network coding,concatenated network coding and hybrid network coding,are investigated.Analysis shows that the proposed framework can be as disseminationefficient as those with random codes,but only more practical.

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Optical Manipulation and Mechanical Characterization of Indi...

Reductive Dechlorination of p-Chlorophenol by Nanoscale iron

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作者： Xiaohui Zhang Bioengineering Program &Department of Mechanical Engineering and Mechanics,Lehigh University,bethlehem,PA,USA

Mechanical properties including structural stability and flexibility are critical to protein function in biology.We have adapted optical trapping and manipulation approaches to study how mechanical aspects of proteins relate to their biological functions.in one example,we employed single-molecule optical tweezers to monitor in real time the structural stability of von Willebrand Factor(vWF),aplasma protein essential to the early stages of blood coagulation.We demonstrated that the A2domain of vWF unfolds in response to tensile force and exposes its Tyr842-Met843scissile bond for cleavage by ADAMTS13,a metalloprotease found in the circulating blood.Such process provides an important mechanism to convert the highly thrombogenic,ultra large vWF multimers in blood shear to smaller multimeric forms and,consequently,to prevent overgrown thrombus[1].in another work,using miniature optical tweezers,we directly observed the association/ dissociation dynamics of individual protein-protein complexes[2].Thus,optical manipulation offers a powerful tool for exploring the mechanical aspects of biological molecules.

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Biomedical and Environmental Sciences 2007年第5期20卷 410-413页

作者： RONG CHENG JiAN-LONG WANG WEi-XiAN ZHANG Laboratory of Environmental Technology INET Tsinghua University Beijing 100084 China Department of Civil and Environmental Engineering Lehigh University Bethlehem PA 18015-3176 USA

Objective To investigate reductive dechlorination of 4-chlorophenol （4-CP） by nanoscale Fe^0 under different conditions. Methods Nanoscale Fe^0 was synthesized by using reductive method. 4-CP and its intermediate products were analyzed by HPLC. Chlorine ion was quantified with DX-100 ion chromatograph. Nano-iron particles were observed under a FEi Quanta 200 FEG environmental scanning electron microscope （ESEM）. Results The size of the particles was in the range of 10-100 nm. The nano-iron particles could reduce 4-CP effectively. The initial concentration of 4-CP increased with the decrease of the relative degradation rate, whereas the reduced amount of 4-CP increased. Temperature could influence both the dechlorination rate and the reaction pathway. Moreover, the stability and durability of nanoscale Fe^0 was evaluated through batch studies over extended periods of time. Conclusion The nanoscale Fe^0 can be used for sustainable treatment of contaminants in groundwater.

关键词： Nanoscale iron 4-CP Phenol Dechlorination Priority pollutant

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单声道发声故障原因初探

微型计算机 2003年第6期23卷 87-87页

作者： bethlehem

Ductility demands on buckling-restrained braced frames under earthquake loading

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Earthquake Engineering and Engineering Vibration 2003年第2期2卷 255-268页

作者： Larry A.Fahnestock richard Sause James M.Ricles Le-Wu Lu Department of Civil and Environmental Engineering ATLSS CenterLehigh UniversityBethlehemPennsylvaniaUSA Graduate Research Assistant Department of Civil and Environmental Engineering ATLSS CenterLehigh UniversityBethlehemPennsylvaniaUSA Professor

Accurate estimates of ductility demands on buckling-restrained braced frames(BRBFs)are crucial to performance-based design of BRBFs.An analytical study on the seismic behavior of BRBFs has been conducted at the ATLSS Center,Lehigh University to prepare for an upcoming experimental program.The analysis program DRAiN-2DX was used to model a one-bay,four-story prototype BRBF including material and geometric nonlinearities.The buckling- restrained brace(BRB)model incorporates both isotropic and kinematic hardening.Nonlinear static pushover and time- history analyses were performed on the prototype BRBF.Performance objectives for the BRBs were defined and used to evaluate the time-history analysis results.Particular emphasis was placed on global ductility demands and ductility demands on the BRBs.These demands were compared with anticipated ductility capacities.The analysis results,along with results from similar previous studies,are used to evaluate the BRBF design provisions that have been recommended for codification in the United States.The results show that BRB maximum ductility demands can be as high as 20 to 25.These demands significantly exceed those anticipated by the BRBF recommended provisions.Results from the static pushover and time- history analyses are used to demonstrate why the ductility demands exceed those anticipated by the recommended provisions. The BRB qualification testing protocol contained in the BRBF recommended provisions is shown to be inadequate because it requires only a maximum ductility demand of at most 7.5.Modifications to the testing protocol are recommended.

关键词： buildings buckling-restrained braced frames buckling-restrained braces structural response seismic response ductility demand seismic codes and standards

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神经网络中行波的传播速度分析

数学进展 2009年第1期38卷 19-34页

作者：张领海美国里海大学数学系美国宾夕法尼亚18015

本文研究神经细胞学中一类积分-微分方程行波解的传播速度.众所周知,不同的生物机制通常用不同的方程来模拟,这些方程的行波解具有不同的波速.本文的主要目的就是研究各种不同的生物机制和动力学过程如何影响波速.这些结果对神经科学的... 详细信息

本文研究神经细胞学中一类积分-微分方程行波解的传播速度.众所周知,不同的生物机制通常用不同的方程来模拟,这些方程的行波解具有不同的波速.本文的主要目的就是研究各种不同的生物机制和动力学过程如何影响波速.这些结果对神经科学的研究非常有意义.

关键词：神经网络积分-微分方程行波解波速分析