Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Macroscopic Models"”.
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Integration of micro- and macroscopic models for pedestrian evacuation simulation
… response to the evolving state of evacuations. Macroscopic pedestrian models are low-complexity models that are and well suited to algorithmic analysis and planning, but are quite abstract. Microscopic simulation models allow for a high level of simulation detail but can be computationally …
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Computational Models of Ex Vivo HIV-1 Dynamics and Fitness Across Scales
… we are often interested in mapping collective macroscopic behavior to cell level characteristics, and vice versa. One of the difficulties in bridging cell level and macroscopic scales is how to interpret the meaning of model parameters when moving from one scale to another. We explore this …
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Data-Fitted Generic Second Order Macroscopic Traffic Flow Models
… model has become a favorable ``second order" macroscopic traffic model, which corrects several shortcomings of the Payne-Whitham (PW) model. The ARZ model possesses a family of flow rate versus density (FD) curves, rather than a single one as in the ``first order" Lighthill-Whitham-Richards …
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Evaluation and Laboratory Measurement of the Coefficient of Permeability in Deformable, Unsaturated Soils
… medium was categorized into empirical equations, macroscopic models and statistical models. The influence of void ratio on the coefficient of permeability for a saturated soil was outlined as well, followed by a discussion on the permeability function of a deformable, unsaturated porous medium. …
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Analysis of Energy-Transport Models for semiconductors
In this thesis we study the energy transport models of the charge carriers in the semiconductors, in the unipolar and one-dimensional case. These are macroscopic models, that are useful to describe the thermal eff ects in the semiconductor devices. Usually the set of equations are given by the …
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A Comparative Analysis of Weaving Areas in HCM, TRANSIMS, CORSIM, VISSIM and INTEGRATION
… and accuracy of transportation simulation models. Much of this work has been concentrated on microscopic simulation models because they provide traffic engineers greater opportunity to examine the inherently complex, stochastic, and dynamic nature of transportation systems when compared to …
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Incident-Related Travel Time Estimation Using a Cellular Automata Model
… analysis, queuing theory and cellular automata models, were initially considered, however, the first two macroscopic models were indicated to underestimate travel time by previous literature. A microscopic simulation model based on cellular automata was developed to attain the goal. The model …
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Oxidation kinetics of methylphosphonic acid in supercritical water : experimental measurements and model development
… conditions and to develop. both microscopic and macroscopic models, ranging from regressed global models to an elementary reaction mechanism, to quantify MPA oxidation kinetics in supercritical water. MPA hydrolysis and oxidation rates were experimentally measured in a laboratory-scale plug flow …
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From Microscopic to Macroscopic Scales: Traffic Waves and Sparse Control
Existing traffic models are widely used in multiple frameworks, most prominently, microscopic vehicle-scale occurring on the scale of seconds and macroscopic city-scale flow patterns that develop over the scale of hours. Research works and practical applications usually employ either one or the …
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New Models for Crowd Dynamics and Control
… crowd and evacuation dynamics. Pedestrian models are based on macroscopic or microscopic behavior. In this work, we are interested in developing models that can be used for evacuation control strategies. Hence, we use macroscopic modeling approach, where pedestrians are treated in an …
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Numerical modelling of current transfer in nonlinear anisotropic conductive media
… for a number of important problems on the macroscopic and microscopic scale. This behaviour is examined both experimentally and using computer models. The successful development of a powerful, robust and adaptable numerical model for analysing the complex current transfer behaviour has been …
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Electron Transport through Carbon Nanotube Quantum Dots in A Dissipative Environment
… that influence tunneling phenomenon and macroscopic models of the electromagnetic environment.</p><p>In the resonant tunneling regime (temperature smaller than the intrinsic level width), we characterize the resonant conductance peak, with the expectation that the width and height of the …
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Hierarchical multiscale modeling of Ni-base superalloys
… that features linkage of several fine scale models to incorporate relevant microstructure attributes into the framework to improve the predictability of the constitutive model. This hierarchy of models is being developed in a collaborative research program with the Ohio State University. The …
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Empirical verification of modeled queue lengths
… engineers surveyed stated that they felt the models reported shorter queue lengths than those actually observed in the field while others stated that they felt the models reported longer queues than actual queue lengths. The survey also indicated that most of the engineers surveyed did not …
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Multi-scale multiphase modelling of granular flows
… the microscopic scale, the meso-scale, and the macroscopic scale. Conventionally, granular flows are modelled as a continuum because they exhibit many collective phenomena. Recent studies, however, suggest that a continuum law may be unable to capture the effect of inhomogeneities at the grain …
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Model-based Design and Control of Biopharmaceutical Manufacturing Processes
… for constructing first-principles and data-based models of each unit operation and enable advanced control, (2) a transition from batch to continuous operation provides process control needs to handle the propagation of impurities and other disturbances caused by tight integration of unit …
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A stochastic and dynamic model of delay propagation within an airport network for policy analysis
… resources and computational effort, and macroscopic models that are simple to use, but typically lack aircraft itinerary tracking capabilities and credible queuing models of airport congestion. AND operates by iterating between its two main components: a queuing engine (QE), which is a …
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Prediction of concentrations of reactive nitrogen species in aqueous solutions and cells
… and N20 4 in each kind of system. Microscopic models were developed to describe spatial variations in concentrations near the gasliquid interface, or within the tubing wall and immediately adjacent liquid. These were used to predict parameter values (such as mass transfer coefficients) in …