Three parallel algorithms for classical molecular dynamics are presented. The first assigns each processor a fixed subset of atoms; the second assigns each a fixed subset of inter-atomic forces to compute; the third assigns each a fixed spatial region. The algorithms are suitable for molecular dynamics models which can be difficult to parallelize efficiently—those with short-range forces where the neighbors of each atom change rapidly. They can be implemented on any distributed-memory parallel machine which allows for message-passing of data between independently executing processors. The algorithms are tested on a standard Lennard-Jones benchmark problem for system sizes ranging from 500 to 100,000,000 atoms on several parallel supercomputers--the nCUBE 2, Intel iPSC/860 and Paragon, and Cray T3D. Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems. For large problems, the spatial algorithm achieves parallel efficiencies of 90% and a 1840-node Intel Paragon performs up to 165 faster than a single Cray C9O processor. Trade-offs between the three algorithms and guidelines for adapting them to more complex molecular dynamics simulations are also discussed.

Fast parallel algorithms for short-range molecular dynamics

다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These

Phd by thesis

IN two previous notes1, Prof. Max Born and I have shown that one can obtain a theory of superconductivity by taking account of the fact that the interaction of the electrons with the ionic lattice is appreciable only near the boundaries of Brillouin zones, and particularly strong near the corners of these. This leads to the criterion that the metal should be superconductive if a set of corners of a Brillouin zone is lying very near the Fermi surface, considered as a sphere, which limits the region in the momentum space completely filled with electrons.

On the theory of superconductivity

This article describes the variational and fixed-node diffusion quantum Monte Carlo methods and how they may be used to calculate the properties of many-electron systems. These stochastic wave-function-based approaches provide a very direct treatment of quantum many-body effects and serve as benchmarks against which other techniques may be compared. They complement the less demanding density-functional approach by providing more accurate results and a deeper understanding of the physics of electronic correlation in real materials. The algorithms are intrinsically parallel, and currently available high-performance computers allow applications to systems containing a thousand or more electrons. With these tools one can study complicated problems such as the properties of surfaces and defects, while including electron correlation effects with high precision. The authors provide a pedagogical overview of the techniques and describe a selection of applications to ground and excited states of solids and clusters.

/pdf/quantum-monte-carlo-simulations-of-solids-6ten286iud.pdf

Quantum Monte Carlo simulations of solids

This is likewise one of the factors by obtaining the soft documents of this Diffusion In Crystalline Solids Paperback 1984 Author Graeme E Murch by online. You might not require more time to spend to go to the books launch as skillfully as search for them. In some cases, you likewise get not discover the revelation Diffusion In Crystalline Solids Paperback 1984 Author Graeme E Murch that you are looking for. It will definitely squander the time.

Diffusion in crystalline solids

The haven ratio in fast ionic conductors

The simultaneous lattice diffusion of 59Fe, 51Cr and 57Ni tracers has been measured in the alloys Fe-15Cr-20Ni, Fe-15Cr-45Ni, Fe-22Cr-45Ni and Fe-15Cr-20Ni-1.4Si between 960 and 1400 degrees C. In all four alloys at all temperatures, DCr>DFe>DNi, with DCr/DNi approximately=2.5 and DFe/DNi approximately=1.8. The activation enthalpies for diffusion of the major constituents in any one alloy are quite close to each other. No correlation is found between swelling under irradiation and the diffusion behaviour of the major constituents. The results are discussed on the basis of the random-alloy model. Grain-boundary diffusion is found in these alloys at surprisingly high temperatures.

https://iopscience.iop.org/article/10.1088/0305-4608/10/3/009/pdf

Self-diffusion in austenitic Fe-Cr-Ni alloys

Diffusion in solids: recent developments , Diffusion in solids: recent developments , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی

Diffusion in solids : recent developments

Interfacial Heat Transport in Highly Permeable Media - A Finite Volume Approach Effective Thermal Properties of Hollow-Sphere-Structures - A Finite Element Approach Thermal Properties of Composite Materials and Porous Media: Lattice-Based Monte Carlo Approaches Fluid Dynamics in Porous Media - A Boundary Element Approach Analytical Methods for Heat Conduction in Composites and Porous Media Modeling of Composite Heat Transfer in Open-Cellular Porous Materials at High Temperatures Thermal Conduction Through Porous Systems Thermal Property of Lotus-Type Porous Copper and Application to Heat Sinks Thermal Characterization of Open-Celled Metal Foams by Direct Simulation Heat Transfer in Open-Celled Foams Subjected to Oscillating Flow Radiative and Conductive Thermal Properties of Foams On the Application of Optimization Techniques to Heat Transfer in Cellular Materials

/pdf/cellular-and-porous-materials-thermal-properties-simulation-18hy17id7g.pdf

Cellular and Porous Materials : Thermal Properties Simulation and Prediction

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Graeme E. Murch

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