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  • Open Access


    The Measurement of the Local Slip in Bamboo-Reinforced Concrete Beams Using Moment-Curvature and Bond-Stress


    Journal of Renewable Materials, Vol.9, No.9, pp. 1631-1646, 2021, DOI:10.32604/jrm.2021.015452

    Abstract This paper presents a method of measuring local slip in bamboo-reinforced concrete beams. Local slips (so) are calculated by reducing the elongation of the bamboo reinforcement (ebo) with the elongation of the concrete (eco). The elongation of bamboo reinforcement (ebo) is determined in two ways, namely, read directly through a straingauge mounted on the bamboo reinforcement and calculated based on the force analysis or curvature moment as a control. The elongation of the concrete (eco) is calculated using force analysis or curvature moment. The process of calculating curvature moments and bond stress employs the Excel program. The steps in calculating… More > Graphic Abstract

    The Measurement of the Local Slip in Bamboo-Reinforced Concrete Beams Using Moment-Curvature and Bond-Stress

  • Open Access


    Epithelial Layer Estimation Using Curvatures and Textural Features for Dysplastic Tissue Detection

    Afzan Adam1,*, Abdul Hadi Abd Rahman1, Nor Samsiah Sani1, Zaid Abdi Alkareem Alyessari1, Nur Jumaadzan Zaleha Mamat2, Basela Hasan3

    CMC-Computers, Materials & Continua, Vol.67, No.1, pp. 761-777, 2021, DOI:10.32604/cmc.2021.014599

    Abstract Boundary effect in digital pathology is a phenomenon where the tissue shapes of biopsy samples get distorted during the sampling process. The morphological pattern of an epithelial layer is greatly affected. Theoretically, the shape deformation model can normalise the distortions, but it needs a 2D image. Curvatures theory, on the other hand, is not yet tested on digital pathology images. Therefore, this work proposed a curvature detection to reduce the boundary effects and estimates the epithelial layer. The boundary effect on the tissue surfaces is normalised using the frequency of a curve deviates from being a straight line. The epithelial… More >

  • Open Access


    Differential Organization of Airway Smooth Muscle Cells on Tubular Surface as A Novel Mechanobiology Mechanism of Airway Tissue Morphogenesis

    Linhong Deng1,*, Yang Jin2, Mingzhi Luo1

    Molecular & Cellular Biomechanics, Vol.16, Suppl.2, pp. 80-80, 2019, DOI:10.32604/mcb.2019.07370

    Abstract Airway smooth muscle cells (ASMCs) exists within the bronchial airway wall in a form of spirally winding bundles [1]. This pattern emerges early during embryonic development and is involved in airway branching [2], providing the airway appropriate contractile capacity and resistance to circumferential tension in health or causing excessive airway narrowing in disease such as asthma. Despite its importance, the cause of ASMCs self-organization remains largely a mystery. Previously, we have demonstrated in 2D that ASMCs can sense the curvature in their microenvironment and change behaviors in differentiation, orientation and migration accordingly [3]. Here we further explore in 3D microenvironment… More >

  • Open Access


    Effect of Protein-Induced Membrane Curvature on the Receptor-Ligand Binding Constant

    Long Li1, Jinglei Hu2, Fan Song1,*

    Molecular & Cellular Biomechanics, Vol.16, Suppl.2, pp. 54-55, 2019, DOI:10.32604/mcb.2019.07718

    Abstract Cell adhesion is a fundamental biological process involved in many crucial cellular activities such as tissue formation, immune response, and cell locomotion [1, 2]. The adhesion process is mediated by the specific binding of membrane-anchored receptor and ligand proteins, which is quantified by the two-dimensional binding equilibrium constant [3-5]. These adhesion proteins are associated with cell membranes either via transmembrane domains or via GPI anchors, and may very likely generate membrane curvature, which has been shown for a number of membrane proteins to play an important role in organelle shaping, vesicle trafficking, cell fusion and division as well as protein… More >

  • Open Access


    Rotational Flexibility for Detecting Low Level Damage in Beam-Like Structures

    Saptarshi Sasmal1, K. Ramanjaneyulu2

    Structural Durability & Health Monitoring, Vol.7, No.4, pp. 253-282, 2011, DOI:10.3970/sdhm.2011.007.253

    Abstract This paper proposes a methodology for damage detection in beam like structures using vibration characteristics obtained from transfer matrix technique. At first, vibration characteristics of beam-like structure have been determined with the help of a computer program developed based on the formulations presented in this paper. Then, a detailed study has been carried out to categorise the influence of damage on frequency and mode shape (both displacement and rotational) information. For a structure with known magnitude and location of damage(s), frequencies and mode shape information are obtained and the same has been used in determining the damage in the structure.… More >

  • Open Access


    On the Solution of an Inverse Problem for an Integro-differential Transport Equation

    Ismet Gölgeleyen1

    CMES-Computer Modeling in Engineering & Sciences, Vol.64, No.1, pp. 71-90, 2010, DOI:10.3970/cmes.2010.064.071

    Abstract In this paper, the solvability conditions for an inverse problem for an integro-differential transport equation are obtained and a numerical approximation method based on the finite difference method is developed. A comparison between the numerical solution and the exact solution of the problem is presented. Experimental results show that proposed method is robust to data noises. More >

  • Open Access


    Effect of the curvature for the indented solid with curved surface using flat punch indentation

    Xiuqing Qian, Yanping Cao, Kunya Zhang, Zhicheng Liu

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 129-130, 2011, DOI:10.3970/icces.2011.017.129

    Abstract Depth-sensing instrumented indentation tests are widely used to probe the mechanical properties of materials at a local area and small scales. Generally, indented solid was assumed semi-infinite plane solid because the contact region is small comparing the indented solid. However, for some biomaterial, such as skin, cornea and sclera, the effect of the curvature of the surface cannot be ignored. Using systematic finite element analysis and dimensional analysis, a method to determine the elastic modulus of the materials with curved surface is proposed using flat punch indentation in this paper.

    An axisymmetric, two-dimensional model was adopted and four-node bilinear… More >

  • Open Access


    Simulation of C-start and S-start of fishes by an ALE-GFD method and a curvature-wave backbone model

    Y. Zhao, K.S. Yeo, P. Yu, S.J. Ang

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.2, pp. 59-60, 2011, DOI:10.3970/icces.2011.016.059

    Abstract This paper presents the application of an Arbitrary Lagrangian Eulerian (ALE) and Singular Value Decomposition (SVD) based Generalized Finite Difference (GFD) method to simulate the C- and S-starts of a carangiform-type fish. The numerical model incorporate fluid-structure interaction (FSI) and computation is carried out on a hybrid grid comprising meshfree nodes around the undulating/deforming swimming fish and Cartesian nodes in the background. The meshfree nodes convect with the deformation and motion of the swimmer. A curvature-wave model of the backbone is used to generate the C- and S-start actions of the fish from the experimental data of Spierts and Leeuwen… More >

  • Open Access


    The Mechanical Buckling of Curved Arteries*

    Hai-Chao Han

    Molecular & Cellular Biomechanics, Vol.6, No.2, pp. 93-100, 2009, DOI:10.3970/mcb.2009.006.093

    Abstract Though tortuosity and kinking are often observed in various arteries and arterioles, little is known about the underlying mechanisms. This paper presents a biomechanical analysis of bent buckling in long arterial segments with a small initial curvature using a thick-walled elastic cylindrical arterial model. The critical buckling pressure was established as a function of wall stiffness, wall dimensions, and the axial tension (or axial stretch ratio). The effects of both wall dimensions and axial stretch ratio on the critical pressure, as well as the thin-walled approximation were discussed. The buckling equation sheds light on the biomechanical mechanism of artery tortuosity… More >

  • Open Access


    A Semicontinuum Model for SixGe1 - x Alloys: Calculation of Their Elastic Characteristics and the Strain Field at the Free Surface of a Semi-Infinite Alloy

    V.K. Tewary1, M. D. Vaudin2

    CMC-Computers, Materials & Continua, Vol.25, No.3, pp. 265-290, 2011, DOI:10.3970/cmc.2011.025.265

    Abstract A semicontiuum Green's-function-based model is proposed for analysis of averaged mechanical characteristics of SixGe1 - x. The atomistic forces in the model are distributed at discrete lattice sites, but the Green's function is approximated by the continuum GF in the far field and by the averaged lattice GF in the near field. Averaging is achieved by replacing Si and Ge atoms by identical hypothetical atoms that are x fraction Si and (1-x) fraction Ge. The parameters of the model are derived using the atomistic model from the interatomic potential between the hypothetical atoms. The interatomic potential is obtained from the… More >

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