Jonghyun Lee

Supporting I/O for Remote Visualization of High Performance Scientific Simulations

Physarum polycephalum, a slime mould, is a unicellular organism with unique biological characteristics. One of its characteristics is the plasmodium, a vegetative state of P. polycephalum, which can be fragmented into microplasmodia and fuse back while maintaining its integrity as a unicellular organism. Starvation and a lack of glucose resulted in the formation of globular motile bodies that radially expanded, named 'Satellites', from microplasmodia, instead of a network. How these isolated fragments coordinate and reconstitute larger structures, and how this occurs without a centralized control were the main focus of this thesis. Two different approaches were taken to investigate satellite growth. The first approach was to construct models to describe the satellite growth pattern with physical parameters. The distance travelled by the satellites showed a saturating increase and was consistent between the satellites from the same patch. Therefore, negative chemotaxis from a signal molecule was considered as a mechanism of propagation. The model was constructed based on diffusion of a signal molecule from the patch, and the length scale of the diffusion front as a function of the patch size matched the displacement of the satellites. Using this model, the diffusion coefficient of the signal molecule was calculated, which was within the range of known biological signalling molecules. Also, a scaling relationship was derived based on the maximization principle, assuming that a starving organism would maximize the search area. This assumption is influenced by the optimal foraging theory, which predicts the foraging behaviour of organisms by assuming that the net energy intake is maximized. This scaling was refined with a fusion probability function, calculated based on diffusion and a typical distance between microplasmodia, as well as possible collisions between satellites. The refined scaling equations accurately described the observed number and the sizes of satellites. Based on these models, it is shown that a unicellular organism maximizes the search area even when they are fragmented, and uses a signal molecule to coordinate their behaviour.

Physarum Polycephalum

Choice of a Unicellular Organism

Antoine Allanore

Guillaume Lambotte

Covering the physical and numerical modeling of materials processing, this book includes contributions across the range of metals and minerals. This collection offers a unique opportunity to present models and results for key processes involved in extraction, joining, separation, and casting of materials. The corresponding fundamentals of mass and heat transport as well as physical and thermodynamics properties are addressed, allowing for a cross-disciplinary vision of the field.

Materials Processing Fundamentals 2017

Fiseha Tesfaye

Samuel Wagstaff

This volume includes contributions on the physical and numerical modeling of materials processing, and covers a range of metals and minerals. Authors present models and results related to the basics of processing such as extraction, joining, separation, and casting. The corresponding fundamentals of mass and heat transport as well as physical and thermodynamics properties are addressed, allowing for a cross-disciplinary vision of the field.

Materials Processing Fundamentals 2020

This book includes contributions from the Materials Processing Fundamentals Symposium held at the TMS 2018 Annual Meeting & Exhibition in Phoenix, Arizona. Covering the physical and numerical modeling of materials processing, the volume covers a range of metals and minerals. Authors present models and results related the basics of processing such as extraction, joining, separation, and casting. The corresponding fundamentals of mass and heat transport as well as physical and thermodynamics properties are addressed, allowing for a cross-disciplinary vision of the field.

Materials Processing Fundamentals 2018

This book includes contributions from the Materials Processing Fundamentals Symposium held at the TMS 2019 Annual Meeting & Exhibition in San Antonio, Texas. This volume includes contributions on the physical and numerical modeling of materials processing, and covers a range of metals and minerals. Authors present models and results related the basics of processing such as extraction, joining, separation, and casting. The corresponding fundamentals of mass and heat transport as well as physical and thermodynamics properties are addressed, allowing for a cross-disciplinary vision of the field.

Materials Processing Fundamentals 2019

Shadia Ikhmayies

Lifeng Zhang

Laura Bartlett

Gabriella Tranell

Arief Budiman

James Yurko

Yulia Meteleva-Fischer

Prabhat Tripathy

Guy Fredrickson

EPD Congress is an annual collection that addresses extraction and processing metallurgy. The papers in this book are drawn from symposia held at the 2015 Annual Meeting of The Minerals, Metals & Materials Society. The 2015 edition includes papers from the following symposia: •Materials Processing Fundamentals •Solar Cell Silicon •High-Temperature Electrochemistry II

EPD Congress 2015

Cong Wang

EPD Congress is an annual collection of conference proceedings that addresses extraction and processing metallurgy. The papers in this book are drawn from symposia held at the 2016 Annual Meeting of The Minerals, Metals & Materials Society. The 2016 edition includes papers from the following symposia: Materials Processing Fundamentals Advanced Characterization Techniques for Quantifying and Modeling Deformation

EPD Congress 2016

EPD Congress is an annual collection that addresses extraction and processing metallurgy. The papers in this book are drawn from symposia held at the 2016 Annual Meeting of The Minerals, Metals & Materials Society. The 2016 edition includes papers from the following symposia: •Materials Processing Fundamentals •Advanced Characterization Techniques for Quantifying and Modeling Deformation

Alexandra Anderson

This volume covers various aspects of the fundamentals, synthesis, analysis, design, monitoring, and control of metals, materials, and metallurgical processes and phenomena. Topics represented include but are not limited to: • Experimental, analytical, physical, and computer modeling of physical chemistry and thermodynamics • Modeling of the transport phenomena in materials processing and metallurgical processes involving iron, steel, nonferrous metals, and composites • Second-phase particles in metals and processes and the fundamentals (experimental studies or theoretical studies) on the nucleation, growth, motion, and removal of these particles from the molten metal or reactors • Physical chemistry, thermodynamics, and kinetics for the production and refining of rare-earth metals • Control of industrial processes in the field of extraction and processing of metals and materials

Jonghyun Lee

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