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Showing 1 to 20 of 41 for “"power law model"”.
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Modeling repairable system failure data using NHPP reliability growth mode.
… Poisson process (NHPP) often known as the Power Law model is regarded as one of the best models for repairable systems. The goodness-of-fit test rejects the intensity function of the power law model, and so the log-linear model was fitted and tested for goodness-of-fit. The Weibull Time to …
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Rheological Study of Concentrated Silica Suspensions
… data was applied to the Bingham plastic model and the power law model and the power law model was found to describe the experimental data more closely than the Bingham plastic model. The parameters for these two models were correlated to solids concentration, pH and electrophoretic …
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On-line rheology, flow simulation and system-based modelling of twin-screw extrusion processing of corn meal
… parameters and was fitted to known rheological models (e.g. Power-law model). Furthermore, the effects of temperature and moisture content were incorporated to arrive at a more comprehensive rheological model.
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Modeling And Simulation Of Long Term Degradation And Lifetime Of Deep-submicron Mos Device And Circuit
… has been developed to provide the degradation laws with a better predictability. The method can be easily augmented into any of the existing degradation laws without requiring additional algorithm. With more accurate extrapolation method, we present a direct and accurate approach to modeling …
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A penalty finite element model for axisymmetric flows of power-law and white-metzner fluids
A finite element model based on the penalty function formulation of the equations governing unsteady axisymmetric flows of viscous incompressible fluids obeying power-law and White-Metzner constitutive relations is developed. The formulation accounts for inertial (or convective) terms. For …
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CO2 reduction over noble metal/carbon nanotube catalyst
… from an integral packed bed reactor, a simple power law model of CO_2 conversion indicates global reaction rates of DR and RWGS showing first order dependencies on each reactant. Linear Arrhenius plots of the global rate constants are also obtained. More robust semi-global 3-reaction models are …
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Efeitos viscosos em cilindros imersos em fluidos não-newtonianos
… rheological behaviour can be described by the power law model. Arbitrary values of the flow behaviour index (n) were considered and results for three different values are presented, including the case of a Newtonian fluid (n=1). It was assumed that a slip condition can occur at the interface. …
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The Extragalactic Lens VLBI Imaging Survey (ELVIS) : investigating galaxy cores and black holes with gravitational lens central images
… lens galaxies of these systems. We fit a broken power law model for the matter profile, and constrain the allowed break radii and inner index of this model. To demagnify the central images to the observed level the matter profiles must be slightly shallower than or steeper than isothermal, which …
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Mathematical and Experimental Analysis of Microbicide Vaginal Gels
… A derivation and numerical solution for the 3-D power-law evolution equation. 4. A derivation and numerical solution for the 3-D Ellis evolution equation. All experimental and computational simulations presented in this study involve a finite bolus of fluid, with non-Newtonian viscous properties, …
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Describing the rheology of vibrated, no-slump concrete for application in 3D-printing construction
… to behave as solids at low strain rates. Most models describe two regimes, one describing Newtonian behavior at low strain rates and the second describing a return to the original, non-vibrated behavior at higher strain rates. Concrete can be considered a volume of aggregates suspended in …
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Validation of angle-resolved polarized light scattering spectroscopy as a diagnostic tool for pre-cancer detection
… particles with minimal data acquisition and model-based data analysis. This enables wide area screening and onsite analysis, critical to the clinical applications. The extracted information, however, strongly depends on the selection of the specific model of the cell/tissue scattering and on …
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Development of an alternative test to obtain asphalt mixture creep compliance at low temperatures
… compliance for the creep DC(T) geometry. The power-law model was fitted to the master compliance curves to calculate the m-value and the master curves were compared to the master curve obtained from the IDT creep compliance test.
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Search for evidence of cosmic ray acceleration by supernova Remnant Kes 41 using the Fermi LAT
… [gamma]-ray spectrum was successfully fit to a power-law model of emission consistent with [pi]⁰-decay, a form of non-thermal emission caused by cosmic ray acceleration. An overall approximation of the [gamma]-ray luminosity was then measured as L[gamma] = 1.94 x 1035 erg/s using a measure of …
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Numerical Simulation of High Expansion Foam Into Conduits and Mine Openings
… rheology in order to determine the rheological model parameters to simulate foam as a continuous Non-Newtonian fluid. Furthermore, numerical and experimental results of Hi-Ex foam flowing in a pipe were compared with the objective of validating numerical results. Results of this study show that …
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SIMULATION OF COMPLEX MULTIPHASE, MULTI-COMPONENT, REACTING FLOWS IN POROUS MEDIA
In this study we are concerned with the modelling of multi-component, multiphase chemically reacting flows in porous media, with particular application to the spontaneous combustion of coal and the extraction of coalbed methane. These two related problems involve complex multiphase, multi-component …
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Mathematical modelling of thixotropic and antithixotropic fluids
… 214-227 (2009)] general structure parameter model together with a version of the constitutive law proposed by Moore [Transactions and Journal of the British Ceramic Society, 58, 470-494 (1959)]. In certain limits, this model reduces to the generalised Newtonian power-law model, which we also …
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Modeling the hydrologic and particulate loadings from paved urban surfaces
… and urban snowmelt. Three forms of the power law model (PLM) were used to model particle number density. It was found that significant model error could be introduced into PLMs when the median diameter particle was used to estimate the number of particles per interval, but the SSE of …
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Dynamic Shear Bands in Metals under High Strain Rates
… depends on the selection of the constitutive model. Hence, two constitutive models that take temperature and strain rate effect into account are proposed. The first model is a physically based model that depends on basic physical quantities, such as dislocation densities, Burgers vector, and …
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The Flow of Fluidised Solids
… of a comparison between the fluidised bed and a power-law non-Newtonian fluid flowing under similar conditions. Over a large range of shear rates the power law model is adequate, and it shows the bed to be substantially Newtonian at high fluidising velocities. At lower fluidising velocities, the …
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Understanding supply chain trade-offs through models and scenario planning with a focus on postponement
… of 99% and maintaining or decreasing costs. A model was created to explore the current supply chain as well as the idea of supply chain agility through the implementation of postponement as models can easily be used to understand the cause and effect relationships through the ability to analyze …
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