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 43 for “"Non-linear response"”.
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Non-linear response of a fluid valve
… method of multiple scales is used to study the nonlinear response of a relief valve under a constant static pressure and a sinusoidal dynamic pressure that can be generated by variations in the pneumatic transmission lines. Under certain conditions, large vibrations may occur, causing …
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Constitutive modelling of branched polymer melts in non-linear response
… Pompom constitutive equations. Usually the non-linear terms in this model are fitted to uniaxial extensional data due its sensitivity to levels of branching, but in this thesis I will study a number of other non-linear flows using this model. For each flow the results are compared to …
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Non-Linear Response of Framed Structures to Two-Dimensional Earthquake Motion
Made available in DSpace on 2014-12-10T22:22:17Z (GMT). No. of bitstreams: 1 7511612.pdf: 4219629 bytes, checksum: 78b205de77b4279df366acaed028e55a (MD5) Previous issue date: 1974
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Conditional distributions arising from variation of parameters in non-linear response functions
This paper proposed the idea that the growth of an individual organism follows a mathematical model very closely and that different individuals follow different members of the same parametric family of models. This idea implies that the variation observed between individuals measured at the same …
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Relaxations in molecularly thin simple liquid films:linear viscoelasticity and non-linear response to shear
… relaxations of molecules under confinement, the linear and nonlinear response of molecularly thin simple liquid films confined between two solid surfaces were studied. The method was to measure the resistance to applied oscillatory shear deformation as a function of frequency and amplitude of …
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Relaxations in molecularly thin simple liquid films: Linear viscoelasticity and non-linear response to shear
… relaxations of molecules under confinement, the linear and non-linear response of molecularly thin simple liquid films confined between two solid surfaces were studied. The method was to measure the resistance to applied oscillatory shear deformation as a function of frequency and amplitude of …
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Optical Response Of Finite And Extended Systems
… a method for the calculation of the optical response of infinite systems within time dependent density functional theory. The use of a linear combination of local orbitals and the explicit evolution of the system in time are the main characteristics of our method. It was implemented within …
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Non-Gaussian noise spectroscopy with superconducting qubits
… coupled to a sparse environment or has a non-linear response to external degrees of freedom. Here, we experimentally validate an open-loop quantum control protocol that reconstructs the higher-order spectrum of a non-Gaussian dephasing process using a superconducting qubit as a noise …
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Depth and orbital tuning : a new chronology of glaciation and nonlinear orbital climate change
… glaciation and the understanding of the climatic response to orbital variations. By developing a new age-model, independent of orbital assumptions, a significant non-linear response to orbital forcing becomes evident in the [delta] 18 0 record. The new age-model also indicates glacial terminations …
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Um modelo matemático para estabilidade elástica de cascas cilíndricas enrijecidas
A mathematical model to investigate non-linear branching equilibrium paths of stringer stiffened cylindrical shells under axial compression is presented. This model is based on a general displacements solution of the dynamic non-linear differential equilibrium equations for an isotropic thin …
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Análise de estruturas laminares pelo Método da Energia Discretizada
… assumption, and of plates with geometrically non-linear response by means of the Discrete Energy Method. The results of the analysis of several structures subjected to various types of loading with different elastic properties and boundary conditions are presented. These results are compared …
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Essays on uninsured income risk, lumpy investment and aggregate demand
… aggregate demand. The first chapter analyzes the non-linear response of durable spending to income shocks. Empirically, the average marginal propensity to spend (MPC) on durable goods increases with the size of income changes. I investigate whether a canonical model of lumpy durable investment …
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Pressure-impulse diagrams using finite element analysis for reinforced concrete columns subjected to blast loading
… of the purposes of this project is to study the non-linear response of reinforced concrete structures when subjected to impact and blast loading. The study is conducted at two levels: material level and structural level. At the material level, the strength enhancement of three material models of …
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The Non-Linear Electrodynamic Coupling Between the Solar Wind, Magnetosphere and Ionosphere
… and the solar wind has been shown to have a non-linear response to the interplanetary electric field (IEF). This dissertation presents an empirical study of this polar cap potential saturation phenomenon. First, the saturation of the reverse convection potential under northward is …
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Novel design for foot pressure measurement using opto-electronics in rehabilitation
… compressive loading. The rubber used instilled a non-linear response of the transducer, but nevertheless the concept is validated for miniaturisation and incorporated into applications.
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Optical excitations in cold gases
… dilute Bose system, which allows us to study the non-linear response to the excitation field. We map the problem onto the dynamics of two interacting anisotropic spins, and calculate the precession frequencies exactly both below and above Bose condensation. We demonstrate a relation between Rabi …
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Linking Single Particle Dynamics to Macroscopic Phenomena in Colloidal Gels
… colloids on the microstructure and macroscopic response of colloidal gels to external perturbations. We initially investigate links between the morphologies of stable particle-clusters in weak depletion systems and the microstructure of space-spanning gels. Next, we test the hypothesis that …
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Monte Carlo-Based Predictive Modeling of Geometric Defects in Cellular Truss Structures Manufacturing
… evaluated with our FEA pipeline to predict their non-linear response. Complementary specimens based on triply periodic minimal surfaces (TPMS) and stochastic lattices are also fabricated using selective laser sintering to catalogue the geometric defects specific to the process and surface-based …
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CHEMILUMINESCENCE ANALYSIS BASED ON TWO PHASE REACTANT SYSTEMS
… immobilized on one end of the fiber optic. A non-linear response for hydrogen peroxide was found at a pH of 9 and 10('-3) M luminol concentration. The detection limit for peroxidase was found to be 10('-6) M.</p><p>The reaction between adenosine triphosphate (ATP) and firefly luciferine was …
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Integrated implementation system for pseudodynamic testing
… test method is a tool for obtaining the non-linear response of structures to transient ground acceleration. The modelling technique relies on representing the inertial and viscous damping components of the equation of motion computationally, while obtaining a measure of the non-linear …
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