The Message Passing Interface (MPI) is widely used to write parallel programs using message passing. due to the complexity of parallel programming there is a need for tools supporting the development process. There ar...
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different thickness of amorphous/nanocrystalline multi-layered structure can be used to modulate the strength andductility of the composite *** this work,moleculardynamics simulations were conducted to study the thi...
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different thickness of amorphous/nanocrystalline multi-layered structure can be used to modulate the strength andductility of the composite *** this work,moleculardynamics simulations were conducted to study the thickness effect of nanocrystalline layer on mechanical properties anddeformation behavior of the Cu64Zr36/Cu multi-layer *** stress-strain relationship,local stress,local strain,anddeformation mechanism are *** results reveal that the change of thickness of the crystalline layer significantly affects the mechanical properties anddeformation *** the strain at the elastic region,the amorphous Cu64Zr36 layerdominates the mechanical behavior,leading the fact that Young’s modulus,first yielding stress,and first yielding strain are close to that of Cu64Zr36 *** the strain at the plastic region,the contribution of the crystalline layer on the mechanical behavior becomes more and more significant with increasing the thickness of the crystalline *** the thickness ratio(amorphous/crystalline)of 4,the shear banddeformation of amorphous layerdominates the mechanical *** the thickness ratio is 1,the glide dislocation of the crystalline layerdominates the stress-strain behavior.
The most frequently used part of MPI-2 is MPI I/O. due to the complexity of parallel programming in general, and of handling parallel I/O in particular, there is a need for tools that support the application developme...
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Steiner connecteddominating set （SCdS） is a generalization of the famous connecteddominating set problem, where only a specified set of required vertices has to be dominated by a connecteddominating set, and know...
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Steiner connecteddominating set （SCdS） is a generalization of the famous connecteddominating set problem, where only a specified set of required vertices has to be dominated by a connecteddominating set, and known to be NP- hard. This paper firstly modifies the SCdS algorithm of Guha and Khuller and achieves a worst case approximation ratio of （2 ＋ 1/（m - 1））H（min（△, k）） ＋O（1）, which outperforms the previous best result （c ＋ 1）H（min（△, k）） ＋ O（1） in the case of m ≥ 1 ＋1/（c - 1）, where c is the best approximation ratio for Steiner tree, A is the maximum degree of the graph, k is the cardinality of the set of required vertices, m is an optional integer satisfying 0 ≤ m ≤ min（△, k） and H is the harmonic function. This paper also proposes another approximation algorithm which is based on a greedy approach. The second algorithm can establish a worst case approximation ratio of 2 ln（min（△, k）） ＋ O（1）, which can also be improved to 2 lnk if the optimal solution is greater than c·e^2c＋1/2（c＋1）.
The book presents the state of the art in highperformancecomputing and simulation on modern supercomputer architectures. It covers trends in hardware and software development in general and specifically the future o...
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ISBN:
(数字)9783642222443
ISBN:
(纸本)9783642222436;9783662508107
The book presents the state of the art in highperformancecomputing and simulation on modern supercomputer architectures. It covers trends in hardware and software development in general and specifically the future of vector-based systems and heterogeneous architectures. The application contributions cover computational fluiddynamics, material science, medical applications and climate research. Innovative fields like coupled multi-physics or multi-scale simulations are presented. All papers were chosen from presentations given at the 13th Teraflop Workshop held in October 2010 at Tohoku University, Japan.
OpenMP 4.0 extended affinity support to allow pinning of threads to places. Places are an abstraction of machine locations which in many cases do not require extensive hardware knowledge by the user. For memory affini...
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Nowadays, HPC systems emerge in a great variety including commodity processors with attached accelerators which promise to improve the performance per watt ratio. These heterogeneous architectures often get far more c...
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After analyzing the working condition of the conventional diesel forklift,an energy recovery system in hybrid forklift is considered and its simulation model is ***,the control strategy for the proposed energy recover...
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After analyzing the working condition of the conventional diesel forklift,an energy recovery system in hybrid forklift is considered and its simulation model is ***,the control strategy for the proposed energy recovery system is discussed,which is validated and evaluated by *** simulation results show that the proposed control strategy can achieve balance of the power and keep the state of charge(SOC) of ultra capacitor in a reasonable range,and the fuel consumption can be reduced by about 20.8% compared with the conventional diesel ***,the feasibility of the simulation results is experimentally verified based on the lifting energy recovery system.
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