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Robert Jockwer – One of the best experts on this subject based on the ideXlab platform.

  • Glued-in-rod timber joints: Analytical Model and finite element simulation
    Materials and Structures, 2018
    Co-Authors: A. Hassanieh, H. R. Valipour, M A Bradford, Robert Jockwer

    Abstract:

    In this paper, a closed form Analytical solution for glued-in-rod (GiR) joints is derived by solving the governing differential equations and accurately applying the boundary conditions in a cylindrical coordinate system for a GiR joint comprising of a rod, adhesive (glue) and timber. The results of the Analytical Model are compared with 3D continuum finite element simulations and it is shown that the closed-form solution developed can estimate the stress distribution in the adhesive and adherents (rod and timber) with good accuracy. Furthermore, the stiffness of GiR timber joints can be obtained from this Analytical Model. Closed-form solutions for pull–pull and pull–push test setup configurations are compared and it is shown that the maximum shear stress in the adhesive-adherent interface in a pull–push configuration is around 20% higher than that of the pull–pull counterpart. The typically (around 20%) lower strength of GiR joints in pull–push experiments compared to that of pull–pull tests can be attributed to this higher maximum shear stress which is predicted by the Analytical Model. A parametric study is carried out using the FE and Analytical Models and the effects of different variables on the distribution of stresses in the adhesive and adherents are studied.

  • Glued-in-rod timber joints: Analytical Model and finite element simulation
    Materials and Structures, 2018
    Co-Authors: A. Hassanieh, H. R. Valipour, M A Bradford, Robert Jockwer

    Abstract:

    In this paper, a closed form Analytical solution for glued-in-rod (GiR) joints is derived by solving the governing differential equations and accurately applying the boundary conditions in a cylindrical coordinate system for a GiR joint comprising of a rod, adhesive (glue) and timber. The results of the Analytical Model are compared with 3D continuum finite element simulations and it is shown that the closed-form solution developed can estimate the stress distribution in the adhesive and adherents (rod and timber) with good accuracy. Furthermore, the stiffness of GiR timber joints can be obtained from this Analytical Model. Closed-form solutions for pull–pull and pull–push test setup configurations are compared and it is shown that the maximum shear stress in the adhesive-adherent interface in a pull–push configuration is around 20% higher than that of the pull–pull counterpart. The typically (around 20%) lower strength of GiR joints in pull–push experiments compared to that of pull–pull tests can be attributed to this higher maximum shear stress which is predicted by the Analytical Model. A parametric study is carried out using the FE and Analytical Models and the effects of different variables on the distribution of stresses in the adhesive and adherents are studied.

Leon O. Chua – One of the best experts on this subject based on the ideXlab platform.

  • An Analytical Model of memristors in plants
    Plant Signaling & Behavior, 2014
    Co-Authors: Vladislav S Markin, Alexander G Volkov, Leon O. Chua

    Abstract:

    The memristor, a resistor with memory, was postulated by Chua in 1971 and the first solid-state memristor was built in 2008. Recently, we found memristors in vivo in plants. Here we propose a simple Analytical Model of 2 types of memristors that can be found within plants. The electrostimulation of plants by bipolar periodic waves induces electrical responses in the Aloe vera and Mimosa pudica with fingerprints of memristors. Memristive properties of the Aloe vera and Mimosa pudica are linked to the properties of voltage gated K+ ion channels. The potassium channel blocker TEACl transform plant memristors to conventional resistors. The Analytical Model of a memristor with a capacitor connected in parallel exhibits different characteristic behavior at low and high frequency of applied voltage, which is the same as experimental data obtained by cyclic voltammetry in vivo.

  • An Analytical Model of memristors in plants
    Plant Signaling & Behavior, 2014
    Co-Authors: Vladislav S Markin, Alexander G Volkov, Leon O. Chua

    Abstract:

    The memristor, a resistor with memory, was postulated by Chua in 1971 and the first solid-state memristor was built in 2008. Recently, we found memristors in vivo in plants. Here we propose a simple Analytical Model of 2 types of memristors that can be found within plants. The electrostimulation of plants by bipolar periodic waves induces electrical responses in the Aloe vera and Mimosa pudica with fingerprints of memristors. Memristive properties of the Aloe vera and Mimosa pudica are linked to the properties of voltage gated K+ ion channels. The potassium channel blocker TEACl transform plant memristors to conventional resistors. The Analytical Model of a memristor with a capacitor connected in parallel exhibits different characteristic behavior at low and high frequency of applied voltage, which is the same as experimental data obtained by cyclic voltammetry in vivo.

Thomas Moreau – One of the best experts on this subject based on the ideXlab platform.

  • Including antenna mispointing in a semi-Analytical Model for delay/Doppler altimetry
    IEEE Transactions on Geoscience and Remote Sensing, 2015
    Co-Authors: Abderrahim Halimi, Corinne Mailhes, Jean-yves Tourneret, François Boy, Thomas Moreau

    Abstract:

    Delay/Doppler altimetry aims at reducing the measurementnoise and increasing the along-track resolution in comparison with conventional pulse limited altimetry. In a previous paper, we have proposed a semi-Analytical Model for delay/Doppler altimetry which considers some simplifications as the absence of mispointing antenna. This paper first proposes a new semi-Analytical Model for delay/Doppler altimetry. The proposed Analytical expression for the flat surface impulse response considers antenna mispointing angles, a circular antenna pattern, no vertical speed effect and a uniform scattering. The two dimensional delay/Doppler map is obtained by a numerical computation of the convolution between the proposed Analytical function, the probability density function of the heights of the specular scatterers and the time/frequency point target response of the radar. The approximations used to obtain the semi-Analytical Model are analyzed and the associated errors are quantified by Analytical bounds for these errors. The second contribution of this paper concerns the estimation of the parameters associated with the multi-look semi-Analytical Model. Two estimation strategies based on the least squares procedure are proposed. The proposed Model and algorithms are validated on both synthetic and real waveforms. The obtained results are very promising and show the accuracy of this generalized Model with respect to the previous Model assuming zero antenna mispointing.