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

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

An introduction to heat transfer

Solar Engineering Of Thermal Processes

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Numerical Heat Transfer And Fluid Flow

Thermal management of carbon-based dental laminate via additives carbon nanotube and hydroxyapatite in a vessel micro-flow based on the numerical/empirical data

By 2050, renewables should increase the share of electricity generation to 70 %. According to the net-zero long-term plan, solar energy is at the forefront of renewable sources. The concreted solar plant is one of the best renewable-based electricity generation utilities that can combine with solar cells and battery systems. In this study, basic modelling for counter flow shell-tube type heat exchanger is developed in which melted salt and steam/water are the two-working fluid of the heat exchanger. A two-phase heat transfer analysis has been considered for the boiling phenomena in the saturated steam region. The study is performed for 5 kg·s −1 flow rate of steam/water and for different flow rate of melted salt varying from 75 kg·s −1 to 300 kg·s −1 . Thermodynamic characteristics of the heat exchanger, such as, vapor quality and convective coefficient variation of the steam/water along the length of the heat exchanger has been presented. In addition, temperature profile of the melted salt and the steam/water along the length of the heat exchanger is determined in this study. Numerical analysis affirmed that the battery cooling was successful at Reynolds number of 200–500 as the maximum temperature was lower 320 K. • Develop a battery basic model of the counter flow heat exchanger. • Examine for cooling via boiling phenomena of melted salt and water. • Thermodynamic characteristics along the length of the battery model. 

Increasing electricity generation—Installing photovoltaic cells coupled to a battery pack, to provide the electricity

Retraction notice to “Biaxial mechanical behaviour of polypropylene fibres reinforced self-compacting concrete” [Constructions and Building Materials 278 (2021) 122416]

This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal). This article has been retracted at the request of the Editors-in-Chief. Following an investigation of this and a related paper https://doi.org/10.1016/j.engstruct.2021.113362, the Editors-in-Chief no longer have confidence in the scientific integrity of this paper, as the same set of images has been used in two articles in different journals claiming varying conditions, which violates our publishing policies. In this article, six identical photos of tested specimens in two figures are presented as in another paper, only for different geometric (lap splice length) & material (aggregate type and fiber percentage) conditions. Furthermore, certain test specimen, testing setup, and loading condition geometric features of all eight tested specimen photos across the two figures are inconsistent with other figures presented in the paper, and there are photos presented in two other figures (to show coarse aggregates and fibers) that have been taken from internet sources without attribution. Communication with one co-author, Jorge De Brito, raised further concerns about the integrity of this work, to the extent that he expressed no longer having confidence in the content of the article. 

Retraction notice to"Effect of different fibre types on the structural performance of recycled aggregate concrete beams with spliced bars"

Retraction notice to “Influence of polypropylene fibres and silica fume on the mechanical and fracture properties of ultra-high-performance geopolymer concrete” [Constr. Build. Mater. 283 (2021) 122753]

Arash Karimipour

Papers

Thermal management of carbon-based dental laminate via additives carbon nanotube and hydroxyapatite in a vessel micro-flow based on the numerical/empirical data

Increasing electricity generation—Installing photovoltaic cells coupled to a battery pack, to provide the electricity

Retraction notice to “Biaxial mechanical behaviour of polypropylene fibres reinforced self-compacting concrete” [Constructions and Building Materials 278 (2021) 122416]

Retraction notice to"Effect of different fibre types on the structural performance of recycled aggregate concrete beams with spliced bars"

Retraction notice to “Influence of polypropylene fibres and silica fume on the mechanical and fracture properties of ultra-high-performance geopolymer concrete” [Constr. Build. Mater. 283 (2021) 122753]