Open Access
ABSTRACT
Sheng D. Chao
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 33-34, 2011, DOI:10.3970/icces.2011.017.033
Abstract We performed an immunoassay analysis using the Quartz Crystal Microbalance (QCM) biosensor to detect the specific binding reaction of the (Human IgG1)-(Anti-Human IgG1) protein pair. Both experimental and computational were used to study biomolecular binding reactions in microfluidic channels. We discussed the unsteady convective diffusion in the transportation tube and found that the distribution of the analyte concentration in the tube is strongly affected by the flow field. Due to this, large discrepancies between the simulations and experimental results were observed. We show that the conventional assumption of the uniform and steady analyte concentration used in the computational procedure is… More >
Open Access
ABSTRACT
Ke JI, nlong Chen, Lina Zhang, Xinhua Ji
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 35-36, 2011, DOI:10.3970/icces.2011.017.035
Abstract The Stress distribution of contact area in engineering structure is complex. Automatic whole-field measurement of photo-elasticity is a feasibility method to solve the contact problem. However, the problem of isoclinic and isochromatic interaction is important in phase-shifting techniques in photo-elasticity. The technique named 8-step phase shifting technique is applied to solve the problem of isoclinic fringe pattern influenced by isochromatic fringe patterns in integer order and half-integer order. Isoclinic parameter in the range of [0,I/2] is given by the method.
Based on the eight-step phase shifting technique, some methods to determine the first principal stress direction of the model… More >
Open Access
ABSTRACT
Dr John Dear (Lead Author)
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 37-38, 2011, DOI:10.3970/icces.2011.017.037
Abstract This key-note lecture is a contribution to: ICCES’11 SPECIAL SYMPOSIUM ON MODERN EXPERIMENTAL METHODS IN MECHANICS, ENGINEERING, AND THE SCIENCES (Organizing Committee Co-Chairs: Fu-Pen Chiang (USA), YiIan Kang (China), Huimin Xie (China), Xiaoyuan He (China))
Presented, in this keynote lecture, are experimental data relating to composite sand wich materials subjected to different rates of loading including explosive blast. The composite sandwich materials are manufactured using a variety of different skin and core materials. Experimental results are described for quasi-static, high-rate and explosive blast loading using DIC to identify failures processes.
An important benefit of composite sandwich materials is… More >
Open Access
ABSTRACT
Lin Li, Li Jicheng, Wu Di, Li Ximeng
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 39-40, 2011, DOI:10.3970/icces.2011.017.039
Abstract Two kinds of plasma sprayed Cr2O3 coatings are tested with electro-mechanical impedance (EMI) method. The influence of frequency band on the testing sensitivity of EMI method is investigated in kHz and MHz frequency ranges. The frequency shifts and root mean square deviation (RMSD) of the PZT electric impedance signatures are used as evaluation indicator. The variation of EMI sensitivity is investigated on 8 frequency bands with high mode density in the frequency ranges of 0.1-600 kHz and 1-10 MHz. The results show that in the low frequency range, the frequency shifts increase and the RMSD values first increase and then… More >
Open Access
ABSTRACT
Zhi Xu, Yoshio Bando, Lei Liu, Wenlong Wang, Xuedong Bai, Dmitri Golberg
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 41-42, 2011, DOI:10.3970/icces.2011.017.041
Abstract A specially designed suspended graphene oxide (GO) device has been fabricated and investigated in a transmission electron microscope (TEM)-scanning tunneling microscopy (STM) based setup. The detailed study of step-by-step slow reduction of an individual GO sheet under current flow and thereby Joule heating, while in-parallel performing conductivity measurements, atomic structure imaging, chemical composition, and bonding alternations tracing have been performed. As monitored by electron energy core loss spectroscopy, the oxygen content is tuned from that peculiar to a pristine GO, i.e. 23.8 at.%, to oxygen-free pure graphene. Six orders of magnitude conductance rise is achieved during this process with the… More >
Open Access
ABSTRACT
Li Jicheng, Lin Li, Wu Di, Li Ximeng
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 43-44, 2011, DOI:10.3970/icces.2011.017.043
Abstract Two kinds of plasma sprayed Cr2O3 coating specimens are tested with electro-mechanical impedance (EMI) method. Quantitative investigation on the relationship between PZT excitation voltage and sensitivity of EMI method is performed in the frequency range of 100-110 kHz, with WK 6500B precision impedance analyzer and high excitation voltage electric impedance measurement system (HEVEIMS). A series of excitation voltage are designed from 0.01 to 15 V. Root mean square deviation (RMSD) of the PZT electric impedance signatures is used as an evaluation indicator. The results show that in the frequency range of 100-110 kHz, the RMSD values are not monotone with… More >
Open Access
ABSTRACT
Sheng Sun, Joseph T. Y. Wong, Tong-Yi Zhang
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 45-46, 2011, DOI:10.3970/icces.2011.017.045
Abstract Lipids in water form different structures (or phases) via self-assembly depending on hydration level of lipid. As the hydration level of lipid increases, the self-assembled structures are micelles, cylinder phase, lamellar phase, and inverted cylinder phase. Lamellar phase or bilayer is the most common structure in cells. Experiments reveal that external electric fields can induce cell membrane poration and fusion, and the technique is widely used to transfer external molecules, such as DNA and drugs, into cells.
By using molecular dynamics simulations, we studied the behaviors of pure phospholipid membrane bilayer in an external electric field, which was applied… More >
Open Access
ABSTRACT
Sheng Sun, Joseph T. Y. Wong, Tong-Yi Zhang
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 47-48, 2011, DOI:10.3970/icces.2011.017.047
Abstract Micro/nano structures formed via self-assembly of biological macromolecules, such as DNA and RNA, have potential applications as building units in micro/nano/bio-devices. The self-assembled structures of biological macromolecules can be manipulated by applying electric field. Here we demonstrate such manipulation by using coarse-grained molecular dynamics simulations. Starting from randomly distributed CG DOPE lipids and polarizable water molecules, we studied the self-assembled structures in different hydration levels of lipid (the number of water molecules per lipid) and different strength of external electric fields. When the hydration level of lipid was 24 water per lipid (w/l) or 36 w/l, the self-assembled structures were… More >
Open Access
ABSTRACT
Younho Cho, Weibin Li, Bin Yang
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 49-50, 2011, DOI:10.3970/icces.2011.017.049
Abstract This paper aims at an experimental method for detecting thermal-damages in a tube-like structure using acoustic nonlinear parameter of ultrasonic guided waves. The material nonlinearity of aluminum pipe specimens, which have been subjected to different heat-loading cycles, is measured to characterize the micro-damages. Flexible Polyvinylidene Fluoride (PVDF) comb transducers are used to generate and receive the fundamental and second harmonic waves. The amplitude of the second harmonic wave is extracted from the Fast Fourier Transform (FFT) spectrum of a received signal. The measured relative nonlinear parameter increases monotonically as a function of the propagation distance, and the relative nonlinear parameter… More >
Open Access
ABSTRACT
Xue Feng Yao, Yin Ji Ma, Wen Feng Hao, Yu Chao Ke, Dai Ning Fang
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 51-52, 2011, DOI:10.3970/icces.2011.017.051
Abstract In this paper, some applications of residual stress measurement in engineering material and structures are introduced. First, some advanced measurement technologies are described like drill hole, residual strain gauge and digital image correlations. Second, the manufacture stresses are explained. Finally, the typical measurement results about the manufacture stress are provided, including: residual stress of integrated composite T-section structures, residual stress of adhesive joint, residual stress of bending tube, residual stress of fiber interface. These results will play an important role in designing and evaluating of advanced material and structure. More >
Open Access
ABSTRACT
DaMing Yuan, XiaoLiang Cheng
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 53-54, 2011, DOI:10.3970/icces.2011.017.053
Abstract In this paper, we discuss the numerical method for solving the i??rst kind of elliptic variational inequality. We i??rst use the fundamental solution as the basis function to approximate the solution of variational inequality, then we employ the Uzawa's algorithm to determine the free boundary and the solution. Numerical examples are given to testify the efi??ciency of the method. More >
Open Access
ABSTRACT
B. Liu1, D. Tang2
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 55-60, 2011, DOI:10.3970/icces.2011.017.055
Abstract The effects of the non-Newtonian blood viscosity on the wall shear stress (WSS) of the blood flows in stenotic right coronary arteries have been investigated by computer simulations. The numerical calculations were performed using the Newtonian Model and the non-Newtonian models with the fluid obeying the Power Law and the Carreau models for the simulations of unsteady blood flows. The differences on the spatial and temporal WSS distribution patterns due to the different blood properties were compared. The computational results demonstrate that the blood viscosity properties do not affect the spatial WSS distribution pattern qualitatively. The region on the inner… More >
Open Access
ABSTRACT
F. ZHANG, S. ZHANG, Y. L. XIONG, H. NAKANO, T. NISHIMURA
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 61-62, 2011, DOI:10.3970/icces.2011.017.061
Abstract In deep geological disposal for high-level radioactive waste (HLW), one of the most important factors is to study the thermo-hydraulic-mechanical (THM) behavior of natural barrier that consists of host rock, most made from sedimentary rock or granite. In this paper, based on a new simple thermo-elasto-viscoplastic model of soft rock proposed by Zhang & Zhang (2009), a program of finite element method (FEM) has been developed to simulate the above-mentioned THM behavior of geological disposal. 2D and 3D analyses are conducted to estimate long-term stability of the host rock. The men-made barrier, usually composed of buffer material of bentonite, metal… More >
Open Access
ABSTRACT
Zixin Zhang, Qinghua Lei, Yongchang Cai
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 63-64, 2011, DOI:10.3970/icces.2011.017.063
Abstract Realistic computer models of fracture-block systems have significant impacts on the performance of Block-group Model of fractured rock mass, especially for hydro-mechanical problems. In this paper, a reasonable and effective algorithm for block system construction and visualization is presented. The methodology is based on CAGD Computer Aided Geometric Design and employs object oriented programming (OOP) technique to organize project data, including input parameters, research objects, graphic information and analytical results.
The use of traditional key-block theory for the analysis of blocky rock mass structures in mining and civil engineering is well established. And such methods have been used to… More >
Open Access
ABSTRACT
Hongying Huang, Dehao Yu
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 65-66, 2011, DOI:10.3970/icces.2011.017.065
Abstract In this paper, we apply the coupling of local discontinuous Galerkin(LDG) and natural boundary element (NBE) methods to solve a class of exterior transmission problems in the plane. As a consequence, the main features of LDG and NBEM are maintained and hence the coupled approach benefits from the advantages of both methods. Referring to cite{Gatica2010}, we employ LDG subspaces whose functions are continuous on the coupling boundary. The continuity can be implemented either directly. In this way, the normal derivative becomes the only boundary unknown, and hence the total number of unknown functions is reduced by two. We prove the… More >
Open Access
ABSTRACT
Dong Zhengzhu, Peng Weihong, Li Shuncai1
The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 67-68, 2011, DOI:10.3970/icces.2011.017.067
Abstract Due to the complexity of thermal elastic problems, analytic solutions have been obtained only for some axisymmetrical problems and simply problems. Yu De-hao discussed bending problems of plates with the natural boundary element method. Using the above method, Li Shun-cai discussed the bending problems of solid circular plates] and bending deflections for annular infinite plates under the boundary loads.
On the basis of the same method, expanding the boundary slope into Fourier series, and using several convolution formulae, the boundary integral formula and natural boundary integral equation for the boundary value problems of thermal bending of Circular Plates are… More >
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