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  • RPI SCOREC - Technical Reports
    Shephard A Siegel B Smith X Tang C Wilson and B Wohlmuth Title Multiphysics Simulations Challenges and Opportunities Year 2013 Journal International Journal for High Performance Computing Applications Volume 27 Pages 4 83 Issue 1 Abstract We consider multiphysics applications from algorithmic and architectural perspectives where algorithmic includes both mathematical analysis and computational complexity and architectural includes both software and hardware environments Many diverse multiphysics applications can be reduced en

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=603 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    modulus is essential to understanding the mechanisms by which cells carry out many integrated functions in health and disease Cellular stiffness is regulated by the cytoskeletal composition structural organization and indigenous mechanical stress or prestress borne by the cytoskeleton Current methods for measuring stiffness and prestress of living cells necessitate either limited spatial resolution but with high speed or spatial maps of the entire cell at the expense of long imaging times We have developed a novel technique called biomechanical imaging for generating maps of cellular stiffness and prestress that requires less than 30 s of interrogation time but which provides spatial resolution on the order of a few micrometers The technique is based on the ability to measure tractions applied to the cell while simultaneously observing cell deformation combined with capability to solve an elastic inverse problem to find cell stiffness and prestress distributions We demonstrated the application of this technique by carrying out detailed mapping of the shear modulus and cytoskeletal prestress distributions making no assumptions regarding those distributions or the correlation between them We also showed that on the whole cell level the shear modulus is closely associated with the prestress which is consistent with data from

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=605 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    Problems in Science and Engineering Volume TBD Pages TBD Issue TBD Abstract We apply the adjoint weighted equation method AWE to the direct solution of inverse problems of incompressible plane strain elasticity We show that based on untreated noisy displacements the reconstruction of the shear modulus can be very poor We link this poor performance to loss of coercivity of the weak form when treating problems with discontinuous coefficients We

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=606 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    ABOUT US RESEARCH RESEARCHERS REPORTS SOFTWARE FACILITIES EMAIL SERVICES WIKIS Author Title Duplicate of 2013 9 Year 2013 Abstract

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=607 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    and dislocation Peierls stress was conducted using athermal atomistic simulations at atmospheric pressure to determine the active slip systems Generalized stacking fault energy surfaces calculated using atomistic simulations were used in the PN model to also estimate the critical shear stress for dislocation motion The primary slip plane is found to be 010 in agreement with experimental observations with the 010 100 slip systems having the lowest Peierls stress In

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=608 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    leads to a pronounced size effect on their mechanical behavior In this study we quantify the size effect and determine the minimum model size required to eliminate the size effect for given set of system parameters These include the network density the fiber length and the fiber bending and axial stiffness The results may guide the definition of models and the selection of the size of representative volume elements in

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=611 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    Letters Volume 582 Pages 78 81 Publisher Elsevier Abstract Slip asymmetry is a common occurrence in some monatomic crystals where it is due to complex core structures or specific packing of slip planes Here we present another mechanism based on molecular steric hindrance which leads to asymmetric dislocation motion in cyclotrimethylenetrinitramine RDX molecular crystal Dislocations move at different critical stresses when shear is applied in the positive and negative directions

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=612 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    unresolved fine scales through a model term that contains a fine scale stochastic Green s function For a natural choice of an optimal coarse scale solution and L 2 orthogonal stochastic basis functions we demonstrate that the fine scale stochastic Green s function is intimately linked to its deterministic counterpart In particular i we demonstrate that whenever the deterministic fine scale function vanishes the stochastic fine scale function satisfies a

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=613 (2015-07-15)
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