The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
James P Daubert - One of the best experts on this subject based on the ideXlab platform.
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diagnosis of arrhythmogenic right ventricular cardiomyopathy dysplasia Proposed Modification of the task force criteria
Circulation, 2010Co-Authors: Frank I Marcus, William J Mckenna, Duane L Sherrill, Cristina Basso, Barbara Bauce, David A Bluemke, Hugh Calkins, Domenico Corrado, Moniek G P J Cox, James P DaubertAbstract:Background— In 1994, an International Task Force Proposed criteria for the clinical diagnosis of arrhythmogenic right ventricular cardiomyopathy/dysplasia (ARVC/D) that facilitated recognition and ...
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diagnosis of arrhythmogenic right ventricular cardiomyopathy dysplasia Proposed Modification of the task force criteria
Circulation, 2010Co-Authors: Frank I Marcus, William J Mckenna, Duane L Sherrill, Cristina Basso, Barbara Bauce, David A Bluemke, Hugh Calkins, Domenico Corrado, Moniek G P J Cox, James P DaubertAbstract:Background— In 1994, an International Task Force Proposed criteria for the clinical diagnosis of arrhythmogenic right ventricular cardiomyopathy/dysplasia (ARVC/D) that facilitated recognition and interpretation of the frequently nonspecific clinical features of ARVC/D. This enabled confirmatory clinical diagnosis in index cases through exclusion of phenocopies and provided a standard on which clinical research and genetic studies could be based. Structural, histological, electrocardiographic, arrhythmic, and familial features of the disease were incorporated into the criteria, subdivided into major and minor categories according to the specificity of their association with ARVC/D. At that time, clinical experience with ARVC/D was dominated by symptomatic index cases and sudden cardiac death victims—the overt or severe end of the disease spectrum. Consequently, the 1994 criteria were highly specific but lacked sensitivity for early and familial disease. Methods and Results— Revision of the diagnostic crit...
Paul D. Williams - One of the best experts on this subject based on the ideXlab platform.
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A Proposed Modification to the Robert–Asselin Time Filter*
Monthly Weather Review, 2009Co-Authors: Paul D. WilliamsAbstract:The Robert‐Asselin time filter is widely used in numerical models of weather and climate. It successfully suppresses the spurious computational mode associated with the leapfrog time-stepping scheme. Unfortunately, it also weakly suppresses the physical mode and severely degrades the numerical accuracy. These two concomitant problems are shown to occur because the filter does not conserve the mean state, averaged over the three time slices on which it operates. The author proposes a simple Modification to the Robert‐Asselin filter, which does conserve the three-time-level mean state. When used in conjunction with the leapfrog scheme, the Modification vastly reduces the impacts on the physical mode and increases the numerical accuracy for amplitude errors by two orders, yielding third-order accuracy. The modified filter could easily be incorporated into existing general circulation models of the atmosphere and ocean. In principle, it should deliver more faithful simulations at almost no additional computational expense. Alternatively, it may permit the use of longer time steps with no loss of accuracy, reducing the computational expense of a given simulation.
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A Proposed Modification to the Robert-Asselin time filter
2009Co-Authors: Paul D. WilliamsAbstract:The Robert‐Asselin time filter is widely used in numerical models of weather and climate. It successfully suppresses the spurious computational mode associated with the leapfrog time-stepping scheme. Unfortunately, it also weakly suppresses the physical mode and severely degrades the numerical accuracy. These two concomitant problems are shown to occur because the filter does not conserve the mean state, averaged over the three time slices on which it operates. The author proposes a simple Modification to the Robert‐Asselin filter, which does conserve the three-time-level mean state. When used in conjunction with the leapfrog scheme, the Modification vastly reduces the impacts on the physical mode and increases the numerical accuracy for amplitude errors by two orders, yielding third-order accuracy. The modified filter could easily be incorporated into existing general circulation models of the atmosphere and ocean. In principle, it should deliver more faithful simulations at almost no additional computational expense. Alternatively, it may permit the use of longer time steps with no loss of accuracy, reducing the computational expense of a given simulation.
Frank I Marcus - One of the best experts on this subject based on the ideXlab platform.
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diagnosis of arrhythmogenic right ventricular cardiomyopathy dysplasia Proposed Modification of the task force criteria
Circulation, 2010Co-Authors: Frank I Marcus, William J Mckenna, Duane L Sherrill, Cristina Basso, Barbara Bauce, David A Bluemke, Hugh Calkins, Domenico Corrado, Moniek G P J Cox, James P DaubertAbstract:Background— In 1994, an International Task Force Proposed criteria for the clinical diagnosis of arrhythmogenic right ventricular cardiomyopathy/dysplasia (ARVC/D) that facilitated recognition and ...
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diagnosis of arrhythmogenic right ventricular cardiomyopathy dysplasia Proposed Modification of the task force criteria
Circulation, 2010Co-Authors: Frank I Marcus, William J Mckenna, Duane L Sherrill, Cristina Basso, Barbara Bauce, David A Bluemke, Hugh Calkins, Domenico Corrado, Moniek G P J Cox, James P DaubertAbstract:Background— In 1994, an International Task Force Proposed criteria for the clinical diagnosis of arrhythmogenic right ventricular cardiomyopathy/dysplasia (ARVC/D) that facilitated recognition and interpretation of the frequently nonspecific clinical features of ARVC/D. This enabled confirmatory clinical diagnosis in index cases through exclusion of phenocopies and provided a standard on which clinical research and genetic studies could be based. Structural, histological, electrocardiographic, arrhythmic, and familial features of the disease were incorporated into the criteria, subdivided into major and minor categories according to the specificity of their association with ARVC/D. At that time, clinical experience with ARVC/D was dominated by symptomatic index cases and sudden cardiac death victims—the overt or severe end of the disease spectrum. Consequently, the 1994 criteria were highly specific but lacked sensitivity for early and familial disease. Methods and Results— Revision of the diagnostic crit...
D. K. Lilly - One of the best experts on this subject based on the ideXlab platform.
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A Proposed Modification of the German0 s&grid-scale closure method
2010Co-Authors: D. K. Lilly, Recently GermanAbstract:Recently German0 et al. ’ subsequently designated G4, developed a new subgrid-scale (SGS) closure that appears to offer marked advantages over the widely used Smagorinsky,” hence S, closure. The S closure was first applied extensively to three-dimensional turbulence simulations by Deardorff.3 Lilly4 had earlier evaluated the necessary dimensionless coefficient for the S model, based on the assumption that the grid scale lies within an isotropic and homogeneous inertial range of turbulence. As described by Deardorff,5 Lilly’s value of the coefficient worked well when applied to turbulence produced by buoyant instability. For shear-driven turbulence, however, Deardorff and others found it necessary to use a smaller coefficient. These discrepancies have been verified by other investigators, but the reasons remain somewhat obscure. The G4 closure assumes use of the S formulation, but allows for temporal and spatial variability of the coefficient. It is determined by evaluating the stress-strain relationship at scales of motion a little larger than the grid scale, for which the stresses are explicitly resolved. In the present analysis, we follow G4 and also Moin et a1.,6 who extend the G4 analysis to compressible flow and advection of a passive scalar. A potentially important Modification is introduced, by which the stress-strain relationship is optimized with a least squares approach. This also removes or reduces a singularity problem in the G4 formulation. We assume incompressible Boussinesq dynamics. The tensor equation of motion for variables that have been spatially averaged or filtered on the scale of their spatial resolution is given by
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a Proposed Modification of the germano subgrid scale closure method
Physics of Fluids, 1992Co-Authors: D. K. LillyAbstract:The subgrid‐scale closure method developed by Germano et al. is modified by use of a least squares technique to minimize the difference between the closure assumption and the resolved stresses. This Modification removes a source of singularity and is believed to improve the method’s applicability.
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A Proposed Modification of the Germano subgrid‐scale closure method
Physics of Fluids A: Fluid Dynamics, 1992Co-Authors: D. K. LillyAbstract:The subgrid‐scale closure method developed by Germano et al. is modified by use of a least squares technique to minimize the difference between the closure assumption and the resolved stresses. This Modification removes a source of singularity and is believed to improve the method’s applicability.
Barbara Bauce - One of the best experts on this subject based on the ideXlab platform.
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diagnosis of arrhythmogenic right ventricular cardiomyopathy dysplasia Proposed Modification of the task force criteria
Circulation, 2010Co-Authors: Frank I Marcus, William J Mckenna, Duane L Sherrill, Cristina Basso, Barbara Bauce, David A Bluemke, Hugh Calkins, Domenico Corrado, Moniek G P J Cox, James P DaubertAbstract:Background— In 1994, an International Task Force Proposed criteria for the clinical diagnosis of arrhythmogenic right ventricular cardiomyopathy/dysplasia (ARVC/D) that facilitated recognition and ...
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diagnosis of arrhythmogenic right ventricular cardiomyopathy dysplasia Proposed Modification of the task force criteria
Circulation, 2010Co-Authors: Frank I Marcus, William J Mckenna, Duane L Sherrill, Cristina Basso, Barbara Bauce, David A Bluemke, Hugh Calkins, Domenico Corrado, Moniek G P J Cox, James P DaubertAbstract:Background— In 1994, an International Task Force Proposed criteria for the clinical diagnosis of arrhythmogenic right ventricular cardiomyopathy/dysplasia (ARVC/D) that facilitated recognition and interpretation of the frequently nonspecific clinical features of ARVC/D. This enabled confirmatory clinical diagnosis in index cases through exclusion of phenocopies and provided a standard on which clinical research and genetic studies could be based. Structural, histological, electrocardiographic, arrhythmic, and familial features of the disease were incorporated into the criteria, subdivided into major and minor categories according to the specificity of their association with ARVC/D. At that time, clinical experience with ARVC/D was dominated by symptomatic index cases and sudden cardiac death victims—the overt or severe end of the disease spectrum. Consequently, the 1994 criteria were highly specific but lacked sensitivity for early and familial disease. Methods and Results— Revision of the diagnostic crit...
