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Journal articles on the topic 'Algorithme graphique'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Hampton, J., H. Tesfalem, A. Fletcher, A. Peyton, and M. Brown. "Reconstructing the conductivity profile of a graphite block using inductance spectroscopy with data-driven techniques." Insight - Non-Destructive Testing and Condition Monitoring 63, no. 2 (2021): 82–87. http://dx.doi.org/10.1784/insi.2021.63.2.82.

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The radial depth profile of the electrical conductivity of the graphite channels in the UK's advanced gas-cooled reactors (AGRs) can be reconstructed and estimated by solving a non-linear optimisation problem using the mutual inductance spectra of a set of coils. This process is slow, as it requires many iterations of a forward solver. Alternatively, a data-driven approach can be used to provide an initial estimate for the optimisation algorithm, reducing the amount of time it takes to solve the ill-posed inverse problem. Two data-driven approaches are compared: multi-variable polynomial regre

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2

Du, Hua Yue, Yong Qian, Cheng Guo Wu, Yan Hua Huang, and Xia Li. "Digital Image Restoration in Microscopic Measurement." Applied Mechanics and Materials 421 (September 2013): 421–26. http://dx.doi.org/10.4028/www.scientific.net/amm.421.421.

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The requirement of the accuracy of microscopic measurements becomes more and more high, and traditional methods have been unable to meet the demands. Digital image deconvolution techniques are applied in microscopic measurement. By fabricating a pointolite, the point spread function of the optical system is measured, and then the geometric blurring in traditional microscopy is removed by using the maximum likelihood estimation algorithms and iteration threshold segmentation algorithms. The technique is applied to measure the total content of perlite and spheroidal graphite in spheroidal graphi

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3

Дроздов, М. Н., Ю. Н. Дроздов, А. И. Охапкин, С. А. Краев та М. А. Лобаев. "Новый подход к анализу фазового состава углеродсодержащих материалов методом времяпролетной вторично-ионной масс-спектрометрии". Письма в журнал технической физики 45, № 2 (2019): 50. http://dx.doi.org/10.21883/pjtf.2019.02.47225.17557.

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AbstractNew possibilities offered by the method of secondary ion mass spectrometry (SIMS) for analysis of the phase composition of carbon-containing materials are considered. Differences are established between the mass spectra of three carbon phases: diamond, diamond-like carbon (DLC), and graphite. A simple algorithm for the quantitative determination of different phases in two-phase systems diamond–graphite and DLC–graphite is proposed that is based on the measurement of relative intensities of secondary cluster ions such as C_8/C_5 and CsC_8/CsC_4. It is shown that nonuniform depth profile

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4

Basurto-Hurtado, Jesus A., L. A. Morales-Hernández, Roque A. Osornio-Rios, and Aurelio Dominguez-Gonzalez. "An Approach Based on the Exploratory Data Analysis to Relate the Wear Behavior with the Microstructure of Ductile Cast Irons." Advances in Materials Science and Engineering 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/2605602.

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The aim of this work is to propose a new methodology to relate Ductile Cast Irons (DCIs) wear behavior with the separation distances and sizes of the graphite nodules through an Exploratory Data Analysis (EDA). This methodology consists of morphological image processing tools (compacity and size distribution curves), an EDA performed by the use of box plots and an EDA-based section classifying algorithm. This algorithm classifies the microstructure of DCIs into classes and levels grouping different behaviors of the separation distances and sizes of graphite nodules. Finally, it was found, thro

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Réti, Tamás, Mihály Réger, Ágnes Csizmazia, and Imre Czinege. "Modeling of Distribution of Visible and Non-Visible Graphite Nodules Embedded in the Surface Layer of Ductile Cast Iron." Materials Science Forum 659 (September 2010): 453–58. http://dx.doi.org/10.4028/www.scientific.net/msf.659.453.

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The graphite nodule count and size distribution are important structural parameters in the quantitative characterization of the microstructure of ductile cast irons. In several cases, it is observed that local surface damages (cracks or microchip formations) are generated by the final manufacturing process (superfinishing operation), and these defects are originated basically from the hidden (invisible) graphite nodules located directly below surface. Based on measured data obtained by an image analyzer, a stereological model and a simulation algorithm have been developed to analyse the corres

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AL-OQALI, AMER, ASAAD R. SAKHEL, HUMAM B. GHASSIB, and ROGER R. SAKHEL. "WORM ALGORITHM PATH INTEGRAL MONTE CARLO APPLIED TO THE 3He–4He II SANDWICH SYSTEM." International Journal of Modern Physics B 26, no. 31 (2012): 1250173. http://dx.doi.org/10.1142/s0217979212501731.

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We present a numerical investigation of the thermal and structural properties of the 3 He –4 He sandwich system adsorbed on a graphite substrate using the worm algorithm path integral Monte Carlo (WAPIMC) method [M. Boninsegni, N. Prokof'ev and B. Svistunov, Phys. Rev. E74, 036701 (2006)]. For this purpose, we have modified a previously written WAPIMC code originally adapted for 4 He on graphite, by including the second 3 He -component. To describe the fermions, a temperature-dependent statistical potential has been used. This has proven very effective. The WAPIMC calculations have been conduc

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7

Piwowarczyk, Adam, and Leszek Wojnar. "Machine Learning Versus Human-Developed Algorithms in Image Analysis of Microstructures." Quality Production Improvement - QPI 1, no. 1 (2019): 412–16. http://dx.doi.org/10.2478/cqpi-2019-0056.

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Abstract Automatic image analysis is nowadays a standard method in quality control of metallic materials, especially in grain size, graphite shape and non-metallic content evaluation. Automatically prepared solutions, based on machine learning, constitute an effective and sufficiently precise tool for classification. Human-developed algorithms, on the other hand, require much more experience in preparation, but allow better control of factors affecting the final result. Both attempts were described and compared.

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8

Weiß, K., and Christoph Honsel. "New Algorithm to Calculate Liquid – Solid Shrinkage and Graphite Expansion." Materials Science Forum 508 (March 2006): 509–14. http://dx.doi.org/10.4028/www.scientific.net/msf.508.509.

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Meanwhile the calculation of cooling and solidification is a well introduced tool into the foundry industry for calculating gating and riser systems. However, knowing the areas of last solidification is often no answer to the question if there are any defects in the casting or not. Of course one requirement is an exact description of the heat flow and the heat transfer between melt and mould. But furthermore the liquid/liquid and liquid/solid shrinkage influence the temperature fields due to a convective heat flux. Also auxiliary material influence the liquid/solid behaviour. Auxiliary materia

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9

Pavliuk, Alexander, Sergey Kotlyarevskiy, Evgeny Bespala, and Yuliya Bespala. "Potential of application of IRT-T research reactor as the solution of the problem of graphite radwaste disposal." Nuclear Energy and Technology 4, no. 2 (2018): 127–33. http://dx.doi.org/10.3897/nucet.4.30771.

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Aspects of handling irradiated graphite during decommissioning uranium-graphite reactors (UGR) of different types were investigated. It was demonstrated that handling reactor graphite is complicated by the presence in the composition of graphite of long-lived radionuclides, especially 14C, which may get entrained in biological cycles since carbon constitutes one of the main components of biological chains. Practical implementation of the process of selective separation of 14С can significantly reduce potential danger represented by graphite radioactive wastes due to the reduction of graphite a

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10

Matthies, Siegfried. "GEO-MIX-SELF calculations of the elastic properties of a textured graphite sample at different hydrostatic pressures." Journal of Applied Crystallography 45, no. 1 (2011): 1–16. http://dx.doi.org/10.1107/s002188981104338x.

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The recently developed GEO-MIX-SELF approximation (GMS) is applied to interpret the pressure dependence of the longitudinal ultrasonic wave velocities in a polycrystalline graphite sample that has already been investigated in a wide range of experimental contexts. Graphite single crystals have extremely anisotropic elastic properties, making this sample a challenging test to demonstrate the potential of the GMS method. GMS combines elements of well known self-consistent algorithms and of the geometric mean approximation. It is able to consider mixtures of different polycrystalline phases, each

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11

Treacy, M. M. J., A. Krishnan, and P. N. Yianilos. "Inferring Physical Parameters from Images of Vibrating Carbon Nanotubes." Microscopy and Microanalysis 6, no. 4 (2000): 317–23. http://dx.doi.org/10.1017/s1431927602000557.

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AbstractWe describe a hidden parameter inferencing algorithm for deducing the length, width, and vibration profile from images of thermally excited single-wall carbon nanotubes. With accurate estimates of these parameters, the Young’s modulus can be deduced. The algorithm is sensitive to shot noise in the image, primarily because of the low nanotube image contrast. Noise causes the nanotube length and width to be overestimated, and the vibration amplitude to be underestimated. After correcting for shot noise, we infer an average value of the Young’s modulus of 〈Y〉= 1.20±0.20 TPa, which is larg

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Treacy, M. M. J., A. Krishnan, and P. N. Yianilos. "Inferring Physical Parameters from Images of Vibrating Carbon Nanotubes." Microscopy and Microanalysis 6, no. 4 (2000): 317–23. http://dx.doi.org/10.1007/s100050010037.

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Abstract We describe a hidden parameter inferencing algorithm for deducing the length, width, and vibration profile from images of thermally excited single-wall carbon nanotubes. With accurate estimates of these parameters, the Young’s modulus can be deduced. The algorithm is sensitive to shot noise in the image, primarily because of the low nanotube image contrast. Noise causes the nanotube length and width to be overestimated, and the vibration amplitude to be underestimated. After correcting for shot noise, we infer an average value of the Young’s modulus of 〈Y〉= 1.20±0.20 TPa, which is lar

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13

Fragassa, Cristiano, Matej Babic, Carlos Perez Bergmann, and Giangiacomo Minak. "Predicting the Tensile Behaviour of Cast Alloys by a Pattern Recognition Analysis on Experimental Data." Metals 9, no. 5 (2019): 557. http://dx.doi.org/10.3390/met9050557.

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The ability to accurately predict the mechanical properties of metals is essential for their correct use in the design of structures and components. This is even more important in the presence of materials, such as metal cast alloys, whose properties can vary significantly in relation to their constituent elements, microstructures, process parameters or treatments. This study shows how a machine learning approach, based on pattern recognition analysis on experimental data, is able to offer acceptable precision predictions with respect to the main mechanical properties of metals, as in the case

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14

Soykasap, Omer, and Şükrü Karakaya. "Structural Optimization of Laminated Composite Plates for Maximum Buckling Load Capacity Using Genetic Algorithm." Key Engineering Materials 348-349 (September 2007): 725–28. http://dx.doi.org/10.4028/www.scientific.net/kem.348-349.725.

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In this study, the structural optimization of laminated composite plates for maximum buckling load capacity is performed by using genetic algorithm. The composite plate under consideration is a 64-ply laminate made of graphite/epoxy, is simply supported on four sides, and subject to in-plane compressive static loads. The critical buckling loads are determined for several load cases and different plate aspect ratios using 2-ply stacks of 02, ±45, 902. The problem has multiple global solutions, the results of which are compared with previously published results.

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15

Imran, Malik M., Farrukh Mazhar, and Riaz Ahmad. "Multivariate Optimization of Fiber Reinforced Laminate Using Ant Colony Optimization Algorithm." Materials Science Forum 867 (August 2016): 116–20. http://dx.doi.org/10.4028/www.scientific.net/msf.867.116.

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Fiber reinforced laminate design is a challenging problem in the field of composite laminates. It provides us a systematic way to design the laminates of desired properties while conveniently incorporating the thick-ness and mass constraints. In this paper, we pursue the multivariate graphite fiber reinforced laminate design problem using Ant Colony Optimization (ACO) algorithm. Classical lamination theory is used to determine mid-plane strains, curvatures and stresses in individual lamina under applied biaxial loading conditions. The fiber orientations, lamina thickness, number of layers and

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16

Wang, Bo, Yong Zhang, and Rong Jun Chen. "Experimental and Numerical Simulation of Absorbing Property of Cement-Based Material Blending with Graphite and Carbon Fibers." Applied Mechanics and Materials 464 (November 2013): 20–24. http://dx.doi.org/10.4028/www.scientific.net/amm.464.20.

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The absorbing performance have been tested and analyzed by taking cement as matrix, blending material graphite and carbon fibers for absorbing agent trial Sample, in the 8 ~ 18 GHz frequency band, the results indicate that graphite and carbon fibers and composite cement which made of absorbing material has good absorbing property. Blending material absorbing properties of cement-based materials, the impact must be considered together, not the more the better, when blending material exceeding a certain threshold, enhance its ability of wave-transparent enhance while absorbing property will be r

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17

Kumar, Ambesh, Satyajit Panda, Vivek Narsaria, and Ashish Kumar. "Augmented constrained layer damping in plates through the optimal design of a 0-3 viscoelastic composite layer." Journal of Vibration and Control 24, no. 23 (2018): 5514–24. http://dx.doi.org/10.1177/1077546318756502.

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In this work, a new 0-3 viscoelastic composite (VEC) layer is presented for augmented constrained layer damping of plate vibration. The 0-3 VEC layer comprises a rectangular array of the thin rectangular graphite-wafers embedded within the viscoelastic matrix. The inclusions of graphite-wafers in the constrained 0-3 VEC layer confine the motion of the viscoelastic phase for its reasonable in-plane strains along with the enhanced transverse shear strains. This occurrence of coincidental shear and extensional strains within the viscoelastic phase is supposed to cause augmented damping capacity o

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18

Deveci, H. Arda, and H. Seçil Artem. "On the estimation and optimization capabilities of the fatigue life prediction models in composite laminates." Journal of Reinforced Plastics and Composites 37, no. 21 (2018): 1304–21. http://dx.doi.org/10.1177/0731684418791231.

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In this study, the estimation and optimization capabilities of the multiaxial fatigue life prediction models, namely, Failure Tensor Polynomial in Fatigue, Fawaz–Ellyin, Sims–Brogdon and Shokrieh–Taheri are investigated comparatively. Fatigue life predictions are obtained for multidirectional graphite/epoxy, glass/epoxy, carbon/epoxy and carbon/PEEK composite laminate data taken from the literature. The prediction study shows that the models can predict the fatigue behavior of the multidirectional laminates at different degrees of proximity. In the optimization, a hybrid algorithm combining pa

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19

Hiche, Cristobal, Clyde K. Coelho, and Aditi Chattopadhyay. "A strain amplitude-based algorithm for impact localization on composite laminates." Journal of Intelligent Material Systems and Structures 22, no. 17 (2011): 2061–67. http://dx.doi.org/10.1177/1045389x11424214.

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Automated detection of damage due to low energy impacts in composite structures is very important for aerospace structural health monitoring applications. Low-velocity impact creates subsurface damage that can significantly reduce the stiffness of a component, yet show barely visible damage. This article proposes a novel methodology for impact localization based on the maximum strain amplitude measured by fiber Bragg grating (FBG) sensors during an impact event. The approach correlates the strain amplitude of each sensor pair to find the location of highest strain corresponding to the impact l

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20

Shriver-Lake, Lisa C., Rachael L. Myers-Ward, Scott N. Dean, Jeffrey S. Erickson, David A. Stenger, and Scott A. Trammell. "Multilayer Epitaxial Graphene on Silicon Carbide: A Stable Working Electrode for Seawater Samples Spiked with Environmental Contaminants." Sensors 20, no. 14 (2020): 4006. http://dx.doi.org/10.3390/s20144006.

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The electrochemical response of multilayer epitaxial graphene electrodes on silicon carbide substrates was studied for use as an electrochemical sensor for seawater samples spiked with environmental contaminants using cyclic square wave voltammetry. Results indicate that these graphene working electrodes are more robust and have lower background current than either screen-printed carbon or edge-plane graphite in seawater. Identification algorithms developed using machine learning techniques are described for several heavy metals, herbicides, pesticides, and industrial compounds. Dose-response

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Karmakar, Amit, and Kikuo Kishimoto. "Transient Dynamic Response of Delaminated Composite Twisted Cylindrical Shells Subjected to Low Velocity Impact." Key Engineering Materials 297-300 (November 2005): 1285–90. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.1285.

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In this paper a transient dynamic finite element analysis is presented to study the response of centrally impacted delaminated composite pretwisted cylindrical shells. An eight noded isoparametric plate bending element is employed in the finite element formulation. Effects of transverse shear deformation and rotary inertia are included. To satisfy the compatibility of deformation and equilibrium of resultant forces and moments at the delamination crack front a multipoint constraint algorithm is incorporated. The modified Hertzian contact law which accounts for permanent indentation is utilized

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22

Yu, Jia, Xuan Chen, Xiaoliang Ma, Qingfei Song, Yukun Zhao, and Jiahao Cao. "Influence of Nanoparticles and Graphite Foam on the Supercooling of Acetamide." Journal of Nanomaterials 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/313674.

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Acetamide is a promising phase change materials (PCMs) for thermal storage,but the large supercooling during the freezing process has limited its application. In this study, we prepared acetamide-SiO2composites by adding nano-SiO2into acetamide. This modified PCM was then impregnated into the porous graphite foam forming acetamide-SiO2-graphite foam form-stable composites. These composites were subjected to melting-solidification cycles 50 times; the time-temperature curves were tracked and recorded during these cycles. The time-temperature curves showed that, for the acetamide containing 2 wt

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23

Pleshivtseva, Yuliya, Edgar Rapoport, Bernard Nacke, et al. "Design concepts of induction mass heating technology based on multiple-criteria optimization." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 36, no. 2 (2017): 386–400. http://dx.doi.org/10.1108/compel-05-2016-0216.

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Purpose The purpose of this paper is to describe main ideas and demonstrate results of the research activities carried out by the authors in the field of design concepts of induction mass heating technology based on multiple-criteria optimization. The main goal of the studies is the application of different optimization methods and numerical finite element method (FEM) codes for field analysis to solve the multi-objective optimization problem that is mathematically formulated in terms of the most important optimization criteria, for example, maximum temperature uniformity, maximum energy effic

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24

L'vov, B. V., L. K. Polzik, A. V. Novichikhin, A. V. Borodin, and A. O. Dyakov. "Improved algorithm for linearization of calibration curves in Zeeman graphite furnace atomic absorption spectrometry." Spectrochimica Acta Part B: Atomic Spectroscopy 51, no. 6 (1996): 609–18. http://dx.doi.org/10.1016/0584-8547(95)01444-6.

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Pleshakov, Victor. "Computer models of icosahedral carbon nanostructures (shungite)." Journal of Applied Crystallography 47, no. 2 (2014): 539–43. http://dx.doi.org/10.1107/s1600576713033943.

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A universal algorithm for the generation of three-dimensional models of icosahedral fullerene-like carbon nanostructures has been developed. Coordinates of atoms on their surface are calculated and three-dimensional models of fulleroids – nested icosahedra – are built. A flat model consisting of five graphite layers of varying diameters is computed in an attempt to explain the nature of the diffraction maximum (d≃ 6.81 Å, 2θ ≃ 13°) in shungite carbon by the existence of edge effects, carbon atoms or small fragments of layers in the interlayer space, or dislocation rings.

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Terra, André Miguel Barge Pontes Torres, Jorge Alberto Valle da Silva, and Ronaldo Glicério Cabral. "Three-Group Albedo Method Applied to the Diffusion Phenomenon with Up-Scattering of Neutrons." Defect and Diffusion Forum 258-260 (October 2006): 403–8. http://dx.doi.org/10.4028/www.scientific.net/ddf.258-260.403.

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The main objective of this research is to develop a three-group neutron Albedo algorithm considering the up-scattering of neutrons in order to analyze the diffusion phenomenon in nonmultiplying media. The neutron Albedo method is an analytical method that does not try to solve explicit describing equations for the neutron fluxes [1,2]. Thus the neutron Albedo methodology is very different from the conventional methodology, as the neutron diffusion theory model. Graphite is analyzed as a model case. One major application is in the determination of the nonleakage probabilities with more understa

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27

DEY, SUDIP, and AMIT KARMAKAR. "PARAMETERIZATION OF NATURAL MODES OF COMPOSITE ROTATING CONICAL SHELLS WITH MULTIPLE DELAMINATION." International Journal of Computational Materials Science and Engineering 01, no. 03 (2012): 1250024. http://dx.doi.org/10.1142/s2047684112500248.

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This paper describes a comparative study on free vibration of bending stiff, torsion stiff and quasi-isotropic graphite-epoxy composite conical shells with single and multiple delamination. The finite element formulation is based on Mindlin's theory and multi-point constraint algorithm neglecting the Coriolis effect for moderate rotational speeds. Computer codes are developed employing QR iteration method to obtain delaminated natural frequencies under combined effect of twist and rotation. Mode shapes are depicted for a typical laminate configuration. The non-dimensional natural frequencies o

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28

Cui, D., D. K. Li, and S. M. Zhou. "Hygro-Thermally Curvature-Stable Free-Layer Composite Laminates with Extension-Twist Coupling." Advanced Composites Letters 27, no. 3 (2018): 096369351802700. http://dx.doi.org/10.1177/096369351802700303.

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The tensile strength and compressive strength are indispensable indexes during the design process of composite laminates. For hygro-thermally curvature-stable extension-twist coupled laminates, the improved Differential Evolution Algorithm combined with penalty function is adopted to solve the nonlinear strong constraint of free-layer laminates. The synchronous optimization of multiple targets is achieved, which includes extension-twist coupled effect, tensile strength, compressive strength and buckling strength. Results are presented for free-layer graphite/epoxy composites laminates that con

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Karmakar, Amit, and Kikuo Kishimoto. "Transient Dynamic Response of Delaminated Composite Rotating Shallow Shells Subjected to Impact." Shock and Vibration 13, no. 6 (2006): 619–28. http://dx.doi.org/10.1155/2006/645949.

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In this paper a transient dynamic finite element analysis is presented to study the response of delaminated composite pretwisted rotating shallow shells subjected to low velocity normal impact. Lagrange's equation of motion is used to derive the dynamic equilibrium equation and moderate rotational speeds are considered wherein the Coriolis effect is negligible. An eight noded isoparametric plate bending element is employed in the finite element formulation incorporating rotary inertia and effects of transverse shear deformation based on Mindlin's theory. To satisfy the compatibility of deforma

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Kölbl, G., K. Kalcher, and K. J. Irgolic. "Computerized data treatment for an HPLC-GFAAS system for the identification and quantification of trace element compounds." Journal of Automatic Chemistry 15, no. 2 (1993): 37–45. http://dx.doi.org/10.1155/s1463924693000082.

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Liquid chromatographs, coupled with graphite furnace atomic absorption spectrometers, have been widely used for the identification and quantification of trace element compounds. The quantification of the discontinuous signals from the spectrometer defining a chromatographic band is very much a matter of judgement and therefore prone to error. This paper describes a system which links a high-performance liquid chromatograph via a ‘Brinckman’ flowthrough cup to a Hitachi Zeeman graphite furnace atomic absorption spectrometer equipped with an autosampler. The introduction of aliquots from the col

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Birgin, Hasan Borke, Antonella D’Alessandro, Simon Laflamme, and Filippo Ubertini. "Smart Graphite–Cement Composite for Roadway-Integrated Weigh-In-Motion Sensing." Sensors 20, no. 16 (2020): 4518. http://dx.doi.org/10.3390/s20164518.

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Smart multifunctional composites exhibit enhanced physical and mechanical properties and can provide structures with new capabilities. The authors have recently initiated a research program aimed at developing new strain-sensing pavement materials enabling roadway-integrated weigh-in motion (WIM) sensing. The goal is to achieve an accurate WIM for infrastructure monitoring at lower costs and with enhanced durability compared to off-the-shelf solutions. Previous work was devoted to formulating a signal processing algorithm for estimating the axle number and weights, along with the vehicle speed

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Hajela, P., and C. J. Shih. "Use of an Advanced Shear-Lag Model to Obtain the Optimum Internal Damping in Short-Fiber Composites." Applied Mechanics Reviews 42, no. 11S (1989): S93—S99. http://dx.doi.org/10.1115/1.3152413.

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The present paper examines a modified shear-lag model for predicting the stress distribution in short fiber reinforced composite materials. The model assumes perfect bonding between the fiber and the matrix materials, and allows for the matrix material to partially sustain axial loads. The stress distribution obtained on the basis of this model is used to predict the internal damping characteristics of the composite material. These characteristics are a function of both the material properties and the geometrical layout of the composite, and are optimized by combining the analytical model with

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Khechai, A., and PM Mohite. "Optimum design of perforated symmetric laminates using evolutionary algorithm." Journal of Composite Materials 53, no. 23 (2018): 3281–305. http://dx.doi.org/10.1177/0021998318815324.

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Here, analytical studies have been carried out to determine the optimal values of effective parameters on the stress concentration factor around a cutout using genetic algorithm. Optimum designs of single lamina as well as symmetric laminates with 4, 8 and 12 layers of graphite/epoxy and glass/epoxy plates containing a circular cutout with various sizes are presented. The work focuses on extending the analytical solution given by Greszczuk to determine the stress distribution in multilayered composite plates subjected to arbitrary in-plane loadings. This is achieved by introducing an arbitrary

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Zhang, Shuzhen, Zhigang Ge, and Yanhua Lai. "Application of Genetic Algorithm in Optimizing a Chemical Adsorption Bed with Cacl 2 /expanded Graphite Adsorbent." Procedia Engineering 205 (2017): 1828–34. http://dx.doi.org/10.1016/j.proeng.2017.10.244.

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Yusupov, L. R., K. V. Klochkova, and L. A. Simonova. "The simulation method of chemical composition of vermicular graphite iron on the basis of genetic algorithm." IOP Conference Series: Materials Science and Engineering 240 (September 2017): 012069. http://dx.doi.org/10.1088/1757-899x/240/1/012069.

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Kasdekar, Dinesh Kumar, Vishal Parashar, and Pradeep Soni. "Optimization of Machining Parameters in Electro Discharge Machining of Al6061-Cu-SiC-Graphite Metal Matrix Composite." Materials Science Forum 860 (July 2016): 61–64. http://dx.doi.org/10.4028/www.scientific.net/msf.860.61.

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The newly fabricated hybrid metal matrix composite of Al 6061 reinforced with wt. % of Cu/Sic/Graphite is prepared by a stir casting route. Electrical discharge machining (EDM) is employed to machine this MMC with copper electrode. The purpose of this study is to investigate the second order mathematical model in terms of machining constraints were developed for Material removal rate prediction. The adequacy of the model on MRR has been established with a statistical analysis of variance (ANOVA) to investigate the influence of process parameters and their interactions. Further this model is pr

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Pushkarev, A., A. Prima, V. Ezhov, I. Miloichikova, and E. Petrenko. "Determination of the Pulsed Electron Beam Spectrum by Current and Voltage Oscillograms." Laser and Particle Beams 2021 (January 7, 2021): 1–7. http://dx.doi.org/10.1155/2021/8815697.

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The algorithm and results of calculating the integral and differential energy spectra of a pulsed electron beam (350–500 keV, 80 ns), generated by direct-action accelerators, are presented. The electron spectrum was calculated using the oscillograms of the accelerating voltage, electron current, total current of the diode, and the one-dimensional Child–Langmuir (1D CL) ratio. It was found that the discrepancy in the integrated electron beam energy spectrum, when measured using the total current in the diode and using the electron beam current, did not exceed 15% for 80%–95% of the electrons ge

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Herrera-Chacon, Anna, Inmaculada Campos, Andreu González-Calabuig, Mireia Torres, and Manel del Valle. "Coupling of Sensors and Machine Learning Algorithms in the Qualitative Analysis of Wine." Engineering Proceedings 6, no. 1 (2021): 50. http://dx.doi.org/10.3390/i3s2021dresden-10117.

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This work attempts the identification of the production year, the cultivar’s region and the aging method used in the elaboration of different Spanish red wines, all from the “tempranillo” grape variety. The identification of such characteristics relies on the use of a voltammetric electronic tongue (ET) system formed by modified graphite-epoxy electrodes (GEC) and metallic electrodes to collect a set of six voltammograms per sample, and different chemometric tools to accomplish the final identifications. A large sample set that included 199 different wine samples from commercial and own elabor

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Dey, Sudip, and Amit Karmakar. "Effect of Location of Delamination on Free Vibration of Cross-Ply Conical Shells." Shock and Vibration 19, no. 4 (2012): 679–92. http://dx.doi.org/10.1155/2012/726986.

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Location of delamination is a triggering parameter for structural instability of laminated composites. In this paper, a finite element method is employed to determine the effects of location of delamination on free vibration characteristics of graphite-epoxy cross-ply composite pre-twisted shallow conical shells. The generalized dynamic equilibrium equation is derived from Lagrange's equation of motion neglecting Coriolis effect for moderate rotational speeds. The formulation is exercised by using an eight noded isoparametric plate bending element based on Mindlin's theory. Multi-point constra

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Di Barba, Paolo, Michele Forzan, and Elisabetta Sieni. "Multi-objective design of a power inductor: a benchmark problem of inverse induction heating." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 33, no. 6 (2014): 1990–2005. http://dx.doi.org/10.1108/compel-11-2013-0350.

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Purpose – The purpose of this paper is to investigate a bi-objective optimization problem characterized by coupled field analysis. The optimal design of a pancake inductor for the controlled heating of a graphite disk is considered as the benchmark problem. The case study is related to the design of industrial applications of the induction heating of graphite disk. Design/methodology/approach – The expected goal of the optimization process is twofold: to improve temperature uniformity in the disk and also electrical efficiency of the inductor. The solution of the relevant bi-objective optimiza

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Chowdhury, G. M., G. G. Roy, and S. K. Roy. "Estimation of rate parameters for reduction of iron ore–graphite composite pellets in packed bed reactor using genetic algorithm." Ironmaking & Steelmaking 35, no. 1 (2008): 14–20. http://dx.doi.org/10.1179/174328107x203840.

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Rattanawangcharoen, N., A. H. Shah, and S. K. Datta. "Reflection of Waves at the Free Edge of a Laminated Circular Cylinder." Journal of Applied Mechanics 61, no. 2 (1994): 323–29. http://dx.doi.org/10.1115/1.2901448.

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A wave function expansion method is employed to solve the reflection problem of time-harmonic elastic waves incident upon the free edge of a semi-infinite laminated circular cylinder. Wave functions are obtained using a propagator matrix approach for laminated isotropic cylinders and by a Rayleigh-Ritz type approximation for laminated composite cylinders. The least-square technique as well as the variational method are employed to evaluate the complex amplitudes and the energy flux associated with the reflected waves. To validate the solutions and present algorithm, results are compared with a

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Kim, Dongjae, Sihyung Lee, Wooram Hong, et al. "Image Segmentation for FIB-SEM Serial Sectioning of a Si/C–Graphite Composite Anode Microstructure Based on Preprocessing and Global Thresholding." Microscopy and Microanalysis 25, no. 05 (2019): 1139–54. http://dx.doi.org/10.1017/s1431927619014752.

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AbstractThe choice of materials that constitute electrodes and the way they are interconnected, i.e., the microstructure, influences the performance of lithium-ion batteries. For batteries with high energy and power densities, the microstructure of the electrodes must be controlled during their manufacturing process. Moreover, understanding the microstructure helps in designing a high-performance, yet low-cost battery. In this study, we propose a systematic algorithm workflow for the images of the microstructure of anodes obtained from a focused ion beam scanning electron microscope (FIB-SEM).

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Besnea, Maria Aida Cristina, Dan Catalin Trufasu, Adrian Cotet, and Gabriel Andrei. "Identification of Mechanical Behavior Law Parameters for Polyphenylene Sulphide Composites Reinforced by Glass/Carbon Fibers, Graphite and Polytetrafluoroethylene." Applied Mechanics and Materials 809-810 (November 2015): 531–36. http://dx.doi.org/10.4028/www.scientific.net/amm.809-810.531.

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Mechanical behaviour law for thermoplastic polymers was established on the basis of phenomenological models. This work is intended to examine whether a constitutive equation used for thermoplastic polymers could be applied in case of their composites. G’Sell-Jonas model gave good results when used for the prediction of stress-strain characteristics at high strain rate, for semi-crystalline polymers subjected to mechanical tests. Data obtained through compressive test of polyphenylene sulphide (PPS) composites were processed by a numerical algorithm based on G’Sell-Jonas constitutive equations.

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Van Ngo, Vinh, Mike Hernandez, Bill Roth, and David C. Joy. "STEM Imaging of Lattice Fringes and beyond in a UHR In-Lens Field-Emission SEM." Microscopy Today 15, no. 2 (2007): 12–17. http://dx.doi.org/10.1017/s1551929500050951.

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The phase-contrast imaging of atomic lattices has now become commonplace for both Transmission Electron Microscopes (TEM) and Scanning Transmission Electron Microscopes (STEMs). Recently, however, bright-field STEM images of multi-wall carbon nanotubes (MWCNTs) recorded from an ultra-high resolution (UHR) in-lens field-emission scanning electron microscope (FE-SEM) operating at 30keV have also demonstrated lattice fringe resolution. One example of such an image containing multiple examples of fringe detail is shown in figure 1. The carbon lattice fringes were analyzed and their origin confirme

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Seleš, Karlo, Zdenko Tonković, Ante Jurčević, and Jurica Sorić. "Strain Energy Decomposition Influence in the Phase Field Crack Modelling at the Microstructural Level of Heterogeneous Materials." Key Engineering Materials 827 (December 2019): 482–87. http://dx.doi.org/10.4028/www.scientific.net/kem.827.482.

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The prediction of a crack initiation and propagation occurring on the microstructural level of heterogeneous materials can be a very demanding problem. According to the results of recent investigations, the emerging phase field approach to fracture has a strong potential in modelling the complex crack behaviour in a simple manner. In this study, recently developed phase field staggered solution scheme with the residual norm stopping criterion has been employed for the fracture analysis of heterogeneous microstructure exhibiting complex crack phenomena. The microstructural geometries based on t

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Wang, Ming Hai, Hu Jun Wang, and Zhong Hai Liu. "Study on the Critical Cutting Thickness and the Precision Cutting Experiments of Isotropic Pyrolyric Graphite." Advanced Materials Research 228-229 (April 2011): 458–63. http://dx.doi.org/10.4028/www.scientific.net/amr.228-229.458.

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Isotropic pyrolyric graphite (IPG) is a new kind of brittle material, it not only has the general advantages of ordinal carbonaceous materials such as high temperature resistance, lubrication and abrasion resistance, but also has the advantages of impermeability and machinability that carbon/carbon composite doesn’t have. So it can be used for sealing the aeronautics and astronautics engines turbine shaft and the ethylene high-temperature equipment. The mechanism of this material removal during the precision cutting was analyzed by using the theory of strain gradient. The critical cutting thic

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Srilakshmi, Ch, E. Widjaja, M. Garland, and B. G. Anderson. "Deconvolution of pure component FT-Raman spectra from thermal emission of barium sulfate and graphite samples using the BTEM algorithm." Journal of Raman Spectroscopy 38, no. 3 (2007): 349–55. http://dx.doi.org/10.1002/jrs.1652.

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Pokorny, Tomas, David Vrba, Jan Tesarik, Dario B. Rodrigues, and Jan Vrba. "Anatomically and Dielectrically Realistic 2.5D 5-Layer Reconfigurable Head Phantom for Testing Microwave Stroke Detection and Classification." International Journal of Antennas and Propagation 2019 (August 25, 2019): 1–7. http://dx.doi.org/10.1155/2019/5459391.

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This work presents the design and manufacturing of an anatomically and dielectrically realistic layered phantom of the human head that allows the insertion of ischemic and hemorrhagic stroke phantom models. A 2.5D physical phantom was designed using a representative anatomical image of the human head, which was simplified into 5 different layers that mimic the scalp, skull, cerebrospinal fluid, brain, and stroke regions in terms of anatomy and dielectric properties. Apart from the brain phantom, all other layers consist of a mixture of polyurethane rubber, graphite powder, and carbon black pow

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Alami, Mohamed, Allel Mokaddem, Bendouma Doumi, Nadir Beldjoudi, and Ahmed Boutaous. "Investigation by a Genetic Algorithm of the Effect of Moisture Diffusion on the Fiber Matrix Interface Damage of Graphite/Epoxy Nanocomposite." Recent Patents on Materials Science 8, no. 3 (2015): 253–59. http://dx.doi.org/10.2174/1874464808666150911184646.

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