The Experts below are selected from a list of 650067 Experts worldwide ranked by ideXlab platform
Robert Jockwer - One of the best experts on this subject based on the ideXlab platform.
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Glued-in-rod timber joints: Analytical Model and finite element simulation
Materials and Structures, 2018Co-Authors: A. Hassanieh, H. R. Valipour, M A Bradford, Robert JockwerAbstract: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.
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Glued-in-rod timber joints: Analytical Model and finite element simulation
Materials and Structures, 2018Co-Authors: A. Hassanieh, H. R. Valipour, M A Bradford, Robert JockwerAbstract: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.
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An Analytical Model of memristors in plants
Plant Signaling & Behavior, 2014Co-Authors: Vladislav S Markin, Alexander G Volkov, Leon O. ChuaAbstract: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.
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An Analytical Model of memristors in plants
Plant Signaling & Behavior, 2014Co-Authors: Vladislav S Markin, Alexander G Volkov, Leon O. ChuaAbstract: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.
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Including antenna mispointing in a semi-Analytical Model for delay/Doppler altimetry
IEEE Transactions on Geoscience and Remote Sensing, 2015Co-Authors: Abderrahim Halimi, Corinne Mailhes, Jean-yves Tourneret, François Boy, Thomas MoreauAbstract: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.
Rama Komaragiri - One of the best experts on this subject based on the ideXlab platform.
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An Analytical Model for a reconfigurable tunnel field effect transistor
Superlattices and Microstructures, 2019Co-Authors: R. Ranjith, K. J. Suja, Rama KomaragiriAbstract:Abstract In this work, an Analytical Model for surface potential and current through a reconfigurable tunnel field effect transistor (RTFET) are proposed. While obtaining the mathematical potential Model, the whole channel region is divided into three: two regions with gate electrodes and a region in between two gates. The 2D Poisson′s equation is solved in the region under the gate by appropriately selecting the boundary conditions. The current Model is derived by integrating the band to band generation rate. The Analytical Models are validated using technology computer-aided design (TCAD) simulation and the Analytical Model and TCAD simulations are in good agreement.
H. Jalalifar - One of the best experts on this subject based on the ideXlab platform.
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An Analytical Model to Predict Shear Stress Distribution in Fully Encapsulated Rock Bolts
Geotechnical and Geological Engineering, 2015Co-Authors: M. Ghadimi, K. Shahriar, H. JalalifarAbstract:This study proposes a new Analytical Model to predict shear stress in a fully encapsulated rock bolt in jointed rocks. The main characteristics of the Analytical Model consider the bolt profile and jump plane under pull test conditions. The performance of the proposed Analytical Model, for different bolt profile configurations, is validated by ANSYS software and field. The results show there is a good agreement between Analytical and numerical methods. Studies indicate that the rate of shear stress from the bolt to the rock exponentially decayed. This exponential reduction in shear stress is dependent on the bolt characteristics such as: rib height, rib spacing, rib width and resin thickness, material and joint properties.
