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 20 of 107 for “"continuum model"”.
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A continuum model for needlepunched nonwoven fabrics
… we propose a three-dimensional, large strain continuum model for the constitutive behavior of nonwoven fabrics that accounts for the fiber network characteristics responsible for its anisotropic behavior, and captures the effects of deformation mechanisms at the micro-scale (fiber and …
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Optimization of slender space trusses utilizing a continuum model
A method for the incorporation of continuum modeling in the optimization of large discrete structures is presented. The use of a continuum model facilitates decomposition of optimization problems and augments the scope and applicability of the multilevel decomposition method. This new concept is …
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A subjective authority continuum model for institutions of higher education
… and test a theoretical subjective authority continuum model for institutions of higher education. The model designed consisted of two major parts:(1) a model for the classification of subordinates according to one of 16 subordinate types and (2) a subjective authority continuum presented as a …
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Thermodynamic properties of solid helium using an anharmonic anisotropic continuum model
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-20T21:45:10Z No. of bitstreams: 1 1980_berker.pdf: 2694478 bytes, checksum: b2290d8a1d4c61c040e39e82cedd56e9 (MD5)
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Carbon Nanotube Mechanics: Continuum Model Development from Molecular Mechanics Virtual Experiments
… in the mechanics of materials laboratory on a continuum structure. The output (energy and deformation rather than the load and deflection) is used to understand the material response and formulate macroscopic constitutive relations. From results of MM simulations of axial and torsional …
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Pharmacological Reversal of Cognitive Bias in The Chick Anxiety-Depression Continuum Model
… cognitive bias in the chick anxiety-depression continuum model, chicks exposed to an isolation stressor of 5 min to induce an anxiety-like or 60 min to induce a depressive-like state were then tested in a straight alley maze to a series of morphed ambiguous appetitive (chick silhouette) to …
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The general continuum model for structured populations, with two case studies in plant ecology
… the formulation and usefulness of a very general model for plant population dynamics. In chapter 1, the goal of generality is discussed, particularly in the light of the lack of interaction between field and experimental population studies on the one hand and theoretical population dynamics on the …
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A Microscopic Continuum Model of a Proton Exchange Membrane Fuel Cell Electrode Catalyst Layer
A series of steady-state microscopic continuum models of the cathode catalyst layer (active layer) of a proton exchange membrane fuel cell are developed and presented. This model incorporates O₂ species and ion transport while taking a discrete look at the platinum particles within the active …
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A continuum model for phase transitions in thermoelastic solids and its application to shape memory alloys
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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A tri-phasic continuum model for the numerical analysis of biological tissue proliferation using the Theory of Porous Media. Application to cardiac remodelling in rheumatic heart disease
… can represent the proliferative growth and remodelling processes related to RHD within a thermodynamically consistent framework and is additionally advantageous with application to biological tissue due to the ability to couple multiple constituents, such as tissue and blood. The research …
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A Pore Scale Study of Substrate Mixing and Biological Degradation in Porous Media
Finally, degradation rates obtained from a simple continuum model with uniform flow field are compared to results from the full pore scale model. Substrate degradation rates are consistently underpredicted when transverse dispersion coefficients obtained from nonreactive transport simulations are …
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A continuum Approach to Power system simulation
… This resemblance motivated the derivation of continuum models, which were used to explain and predict disturbance propagation, un-damped power oscillations, and the stability of power systems. In this dissertation, we propose a one-dimensional continuum representation suitable for meshed power …
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Design of elastic metamaterials
… factors.</p> <p>Moreover, an effective continuum model was derived and utilized to investigate the wave propagation in the elastic metamaterials. The effective continuum model works for long wavelength, and is able to accurately determine the band-gap region. In addition, the …
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Micropolar Continuum Modeling of Large Space Structures with Flexible Joints and Thermal Effects: Theory and Experiment
… a geometrically reduced order (homogenized) model for a large antenna space structure with flexible joints. An energy equivalence concept is employed to find the continuum model for the system. The kinetic and strain energy expressions of the fundamental elements are found based on the …
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Multiscale Modeling of the Deformation of Semi-Crystalline Polymers
… length and time scale gaps between atomistic and continuum models are required. In this research, an internal state variable continuum model has been developed whose internal state variables (ISVs) and evolution equations are related to the nano-scale structures. Specifically, the ISVs represent …
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Mechanics of Boron Nitride Nanotubes: A Continuum Theory Based on the Interatomic Potential
A hybrid atomistic/continuum model based on the interatomic potential for boron nitride is also developed to study the Stone-Wales transformation (90° rotation of an atomic bond) in boron nitride nanotubes under tension. It is found that the critical strains for Stone-Wales transformation for …
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Hydration forces between inorganic particles: Crystallization of silicotungstic acid
… These classical colloid theories are based on a continuum model of the solvent. But at such small particle separations, it is believed that the granularity of the solvent becomes important and that this unexpected stability is attributable to solvation forces.
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Activation volumes of carbon diffusion in F.C.C. iron-nickel alloys
… satisfactorily reproduced by a magnetic energy continuum model in which it is assumed that the activation free energy of diffusion is essentially ferromagnetic in origin "--Abstract, page iii.
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Energy propagation in jammed granular matter
… to study in particular due to a lack of accurate continuum description. In this work, studies on these systems are presented using discrete element simulations that model the granular particles as soft, elastic, and frictional disks which interact when in contact. These simulations are used for …
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Modeling and simulation of multi-component condensed phase combustion at the meso-scale
… aim of this thesis is to develop a framework for continuum multicomponent modeling of energetic materials with applications to condensed phase combustion at the meso-scale. The meso-scale is defined to be on tens nano-meters to hundreds microns where physically distinct features, including crystal …
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