Search Results 1-20 of 554

  • An Analysis of Light Scattering in Heterogeneous Translucent Materials  [in Japanese]

    中本 啓子

    … Light scattering in homogeneous materials can be approximated by the Bidirectional Scattering Surface Reflectance Distribution Function (BSSRDF) model, which considers scattering as diffusion. … Second, we simulate light scattering with Monte Carlo ray tracing and analyze characteristics of scattering events. …

    法政大学大学院紀要. 情報科学研究科編 (15), 1-6, 2020-03-24

    IR  DOI 

  • ４次元点状島初期成長における捕獲領域分布のスケーリング解  [in Japanese]

    中井 日佐司

    … For the data of scaled capture-zone distribution (CZD) in the results of kinetic Monte Carlo (KMC) simulations of a point island model of irreversible nucleation and growth in four dimensions [Feng Shi, Yunsic Shim and Jacques G. …

    電気通信大学紀要 32(1), 47-53, 2020-02-01

    IR  DOI 

  • Fast Directional Energy Interchange Used in MCMC-based Autonomous Decentralized Mechanism toward a Resilient Microgrid

    Yusuke Sakumoto , Ittetsu Taniguchi

    … As a scalable mechanism for such energy transfer (energy interchange), we proposed an autonomous decentralized mechanism (ADM) based on Markov Chain Monte Carlo (MCMC), and clarified that our ADM accomplishes the global objective to quickly supply energy appropriately for energy demand all over the microgrid. … We first design a method of the directional energy interchange to be able to quickly transfer energy in an appropriate direction on the basis of the advection-diffusion equation used in physics. …

    情報処理学会論文誌 61(1), 2020-01-15

    IPSJ 

  • Mobility Model Parameters of Strained Si by Using a Quantum Drift Diffusion Model  [in Japanese]

    Tamiya Yuki , Hiroki Akira

    … <p>In this study, we have investigated model parameters of a low-field mobility model in the quantum drift diffusion (QDD) model for strained Si channel MOSFETs. … The model parameters of the mobility model are evaluated by comparing with the data calculated by using Monte Carlo method which replicates the experimental data with high accuracy. …

    IEEJ Transactions on Electronics, Information and Systems 140(11), 1171-1175, 2020

    J-STAGE 

  • Defect Structure and Oxide-ion Conduction in (La, Sr)<sub>2</sub>NiO<sub>4+δ</sub> with Layered Perovskite Structure

    Kitamura Naoto , Ishizaki Kakeru , Ishida Naoya , Idemoto Yasushi

    … (x = 1/4) with a layered perovskite structure was investigated by a molecular dynamics simulation and a reverse Monte Carlo modelling using a Faber-Ziman structure factor in addition to a Bragg profile. … Such a structural feature may be one of the reasons for inferior oxide-ion diffusion in the Sr-substituted material.</p> …

    Chemistry Letters 49(9), 1071-1074, 2020

    J-STAGE 

  • Finite volume computation for the non-stationary probability density function of an impulsively controlled 1-D diffusion process

    Yaegashi Yuta , Yoshioka Hidekazu , Tsujimura Motoh , Fujihara Masayuki

    … <p>We derive a Fokker Planck Equation (FPE) governing probability density functions (PDFs) of an impulsively controlled 1-D diffusion process in seasonal population management problems. … We demonstrate that the computed PDFs with the FVM and those with a Monte Carlo method agree well.</p> …

    Journal of Advanced Simulation in Science and Engineering 7(2), 262-278, 2020

    J-STAGE 

  • Simulation of light propagation in human tissue for noninvasive measurement of blood turbidity.  [in Japanese]

    Fan Yingshuai , Liang Shiyang , Shimizu Koichi

    … This technique is based on the diffusion approximation of transport equation. … To solve these problems, we made the Monte Carlo (MC) simulation of photon propagation in random medium. …

    Transactions of Japanese Society for Medical and Biological Engineering Annual58(Abstract), 441-441, 2020

    J-STAGE 

  • Time-dependent Diffusion in Transient Splenial Lesion: Comparison between Oscillating-Gradient Spin-echo Measurements and Monte-Carlo Simulation

    Maekawa Tomoko , Kamiya Kouhei , Murata Katsutoshi , Feiweier Thorsten , Hori Masaaki , Aoki Shigeki

    … Here, we report findings from oscillating gradient spin-echo (OGSE) diffusion imaging in a case of transient splenial lesion. … Compared with normal-appearing white matter, the splenial lesion exhibited greater differences between diffusion time <i>t</i> … We also conducted 2D Monte-Carlo simulation. …

    Magnetic Resonance in Medical Sciences, 2020

    J-STAGE 

  • Stochastic Simulation of Pattern Formation for Negative-Type Chemically Amplified Resists in Extreme Ultraviolet Lithography

    Yasuda Masaaki , Koyama Masanori , Imai Kyohei , Shirai Masamitsu , Kawata Hiroaki , Hirai Yoshihiko

    … The deposited energy distribution in the resist by EUV light exposure is calculated by Monte Carlo simulation of the photoelectron scattering. … Acid diffusion and the polymer crosslinking reactions during the post-exposure bake (PEB) are then simulated. …

    Journal of Photopolymer Science and Technology 33(1), 53-56, 2020

    J-STAGE 

  • Monte Carlo Simulator for Diffusion-weighted Imaging Sequences

    Tachibana Yasuhiko , Duval Tanguy , Obata Takayuki

    … <p>We developed a Monte Carlo simulator for diffusion-weighted imaging sequences which displays the motion of water molecules and computes the dynamic phase dispersion due to the applied motion probing gradients. … This simulator can be used to validate the analytical equations of diffusion models and understand their limitations due to their approximations. …

    Magnetic Resonance in Medical Sciences, 2020

    J-STAGE 

  • Fast Directional Energy Interchange Used in MCMC-based Autonomous Decentralized Mechanism toward a Resilient Microgrid

    Sakumoto Yusuke , Taniguchi Ittetsu

    … As a scalable mechanism for such energy transfer (energy interchange), we proposed an autonomous decentralized mechanism (ADM) based on Markov Chain Monte Carlo (MCMC), and clarified that our ADM accomplishes the global objective to quickly supply energy appropriately for energy demand all over the microgrid. … We first design a method of the directional energy interchange to be able to quickly transfer energy in an appropriate direction on the basis of the advection-diffusion equation used in physics. …

    Journal of Information Processing 28(0), 75-85, 2020

    J-STAGE 

  • Electron extraction enhancement via the magnetic field in a miniature microwave discharge neutralizer

    Sato Yosuke , Koizumi Hiroyuki , Nakano Masakatsu , Takao Yoshinori

    … This study analyzes the dependence of electron extraction efficiency, which is defined as the ratio of the extracted electron current to the generated electron current, on the orifice shapes and magnetic fields of a miniature microwave discharge xenon neutralizer via three-dimensional particle-in-cell simulations with Monte Carlo collisions (PIC–MCCs). …

    Journal of Applied Physics 126(24), 243302, 2019-12-23

    IR 

  • Dissociative reactions induced by electron impact and electron transport in TEOS vapor

    KAWAGUCHI Satoru , HIGUCHI Hisashi , LI Hu , DENPOH Kazuki , TAKAHASHI Kazuhiro , SATOH Kohki

    … Electron transport coefficients, such as the mean-arrival-time drift velocity, bulk drift velocity, longitudinal bulk diffusion coefficient, and ionization coefficient, and rate coefficients for both elastic and inelastic collisions in TEOS vapor are calculated from the present cross section set using a Monte Carlo method. …

    Japanese Journal of Applied Physics 58(6), 066003, 2019-06-05

    IR  DOI 

  • All-Electron Quantum Monte Carlo with Jastrow Single Determinant Ansatz: Application to the Sodium Dimer

    Nakano Kousuke , Maezono Ryo , Sorella Sandro

    … In this work, we report potential energy surfaces (PESs) of the sodium dimer calculated by variational (VMC) and lattice-regularized diffusion Monte Carlo (LRDMC). …

    Journal of Chemical Theory and Computation 15(7), 4044-4055, 2019-05-22

    IR 

  • Effects of negative ions on discharge characteristics of water plasma source for a miniature microwave discharge ion thruster

    Nakamura Kengo , Koizumi Hiroyuki , Nakano Masakatsu , Takao Yoshinori

    … This work analyzes the discharge characteristics of water plasma for a miniature microwave discharge ion thruster via three-dimensional particle-in-cell simulations with Monte Carlo collisions. … On the other hand, this study confirms the axial oscillation of the OH− negative ion density, in addition to azimuthal rotation, causing plasma instability with a periodic low-frequency anomalous diffusion. …

    Physics of plasmas 26(4), 043508, 2019-04-12

    IR 

  • Atomistically Kinetic Simulations of Carbon Diffusion in <i>α</i>-Fe with Point Defect  [in Japanese]

    NGUYEN Tien Quang , HO Ngoc Nam , SATO Kazunori , SHIBUTANI Yoji

    … <p>Effect of vacancy (V) on the stability and diffusion properties of carbon in body-centered cubic (BCC) iron were studied using molecular statics calculations in combination with kinetic Monte Carlo (kMC) simulation. … The diffusion paths and barriers of carbon were then analyzed using the nudged-elastic band method. …

    The Proceedings of The Computational Mechanics Conference 2019.32(0), 250, 2019

    J-STAGE 

  • Transient response analysis of a linear system subjected to non-Gaussian random excitation by the equivalent non-Gaussian excitation method  [in Japanese]

    TSUCHIDA Takahiro , KANNO Kohei

    … However, the moment equations are generally not closed due to the complex nonlinearity of the diffusion coefficient in the governing equation for the excitation. … Therefore, using the equivalent non-Gaussian excitation method, the diffusion coefficient is replaced by the equivalent one, which is expressed by a quadratic polynomial. …

    The Proceedings of the Dynamics & Design Conference 2019(0), 155, 2019

    J-STAGE 

  • A NUMERICAL STUDY ON THE MASS DIFFUSION IN UNSATURATED POROUS MEDIA  [in Japanese]

    KIMOTO Kazushi

    <p>本研究は，不飽和多孔質体における物質拡散挙動を調べることを目的に，ランダムウォークをベースとした数値拡散解析手法の開発を行ったものである．ここで提案する方法では，固相粒子を充填して作成した周期多孔質構造のユニットセルにおいて，モンテカルロ法を用いて界面エネルギーが極小値をとるように間隙水を配置する．作成した数値不飽和多孔質媒体は，液相を拡散媒体としたランダムウォークによる物質拡散 …

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)) 75(2), I_113-I_124, 2019

    J-STAGE 

  • IMPLEMENTATION OF PIN POWER FACTORS IN THE ANSYS CFX/PARCS COULPLING SYSTEM FOR LOCAL ANALYSIS OF NEUTRON OSCILLATION

    Du Zhuoqi , Seidl Marcus , Macian-Juan Rafael

    … This paper presents the methodology to couple the Multiphysics Computational Fluid Dynamics (CFD) code ANSYS-CFX 18.0 with the 3D neutron diffusion code PARCS v3.2. … The cross sections as well as the pin power fractions (PPFs) used in the neutronic calculation are generated with the 3D Monte Carlo code SERPENT. …

    The Proceedings of the International Conference on Nuclear Engineering (ICONE) 2019.27(0), 1800, 2019

    J-STAGE 

  • SOLUTION OF THE SKODA 'FULL-CORE VVER-1000' BENCHMARK

    Bilodid Yuri

    … Since pin power values are not directly measured by a core monitoring system, the Monte Carlo solution is taken as the benchmark reference. … benchmark obtained by HZDR using the Monte Carlo code Serpent 2 and the nodal diffusion code DYN3D with a pin power reconstruction capability. …

    The Proceedings of the International Conference on Nuclear Engineering (ICONE) 2019.27(0), 1558, 2019

    J-STAGE 

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