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 32 for “"Linear region"”.
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Experimental and Mathematical Modeling of the Interaction of a Perturbed Free Shear Layer With a Flat Plate
… shear layers on a solid boundary located in the linear region of the shear layer is developed. The model is compared with experimental results. The experimental results and the model suggest that the oscillations that are most amplified are those whose feedback signals from the disturbance plate …
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Investigations into the Form and Design of an Elbow Exoskeleton Using Additive Manufacturing
… cut pattern, it is even possible to control the linear region. The TPU TPMS test showed that given the same volume, changing the lattice parameters can result in different bending stress-strain curves. This thesis also provides many prototypes, test data, and samples for future reference.
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Mechanical Investigation of Damage in Ligaments
… of collagen fibers determines the nonlinearity in the toe region of the tensile axial stress-strain curve. Straight collagen fibers behave as a linear elastic material. The gradual damage of collagen fibers determines the nonlinearity in the failure region of the tensile axial …
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VLSI implementation of an efficient method for the computation of line spectral frequencies
<p>In speech coding applications using linear predictive techniques, the computation of line spectral frequencies (LSFs) from the predictor coefficients is an extremely computationally intensive task. The unique properties of the symmetric and antisymmetric polynomial roots limit the region which …
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Electrodeposition and characterization of metals and metal oxides for energy conversion and storage
… electrochemically active surface area, the linear region of the two Tafel plots fell on the same line--suggesting the active species, likely Co(IV), for the oxygen evolution reaction is the same on both materials. Paper III introduces the fabrication of nanometer-thick gold on silicon as an …
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Quantification of the Elastic and Relaxation Properties of Human Tunica Albuginea under Biaxial Loading
… strain at inflection point between the toe region and linear region on the stress-strain curve, as well as percent stress relaxation after 30 minutes were compared between anatomic directions and ramp number. Only stiffness and percent relaxation showed a statistically significant difference …
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Optimization of ligament parameters on a subject-specific computational human knee model in a dynamic knee simulator using design of experiments
… relationship of the ligament goes from the nonlinear "toe" region to the linear region (epsilon sub l). Experimental testing was performed at the University of Kansas Experimental Joint Biomechanics Research Laboratory (Lawrence, Kansas) in the Kansas Knee Simulator (KKS) under various loading …
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High Order Explicit Semi-Lagrangian Method for the Solution of Lagrangian Transport and Stochastic Differential Equations
… order of accuracy of the time integrator. The linear and non-linear growth of instabilities in a two shear layer cold flow configuration is studied using a combination of Linear Stability Analysis (LSA) and Direct Numerical Simulation (DNS) based on a DSEM approximation of the first-principle …
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Fractional modelling of rechargeable batteries
… lithium-ion and nickel-metal hydride cells, the linear region of the charge-voltage curve, and the transient recovery tail that results from a step-change in load current.
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Optimization studies of thermal bimorph cantilevers, electrostatic torsion actuators and variable capacitors
… two tuning voltage regimes: first a parabolic region that achieves roughly a 290% tuning range, then a linear region that achieves an additional 310%, making the total tuning range about 600%. The variable capacitor with comb drive electrodes has a parabolic region that achieves roughly a 205% …
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Device Characterization and Compact Modeling of the SiGe HBT in Extreme Temperature Environments
… saturation, through quasi-saturation and the linear region including impact ionization effects. This model was developed through a combination of physical calculations based on doping profiles and optimization techniques for modeling fitting. The SET model of this dissertation added 32 …
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Comparative Study of the Effect of Tread Rubber Compound on Tire Performance on Ice
… performance (found to be most prominent in the linear region of the drawbar-slip curve) and on the resistive forces of free-rolling tires. Modeling of the tire-ice contact for estimation of temperature rise and water film height was performed using ATIIM 2.0. The performance of this in-house …
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Influence Of Dissolved Hydrogen On The Fatigue Crack Growth Behaviour Of Aisi 4140 Steel
… and the fatigue crack growth rate in the linear region were determined. Fatigue crack growth behaviour of specimens without any dissolve hydrogen were then compared with the specimens with different concentration of dissolved hydrogen. </p> <p>The test results show that the dissolved …
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Development of pulse-width-modulation techniques for multi-phase and multi-leg voltage source inverters
… the continuous PWM schemes and operation in the linear region of the modulation only. Both multi-phase carrier-based PWM and SVPWM schemes are considered, and, in particular, five-phase, seven-phase e-phase systems are addressed in detail. Thus, a strong link between these two different …
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A geological and geophysical study of the Tendaho Graben in the Afar Depression, Ethiopia: insights into transitional continental rifting
… elevated magnetic anomaly that coincides with a linear region of hydrothermal activity. This magnetic geometry is similar in dimension and magnitude to that observed from magnetic stripes of typical mid-ocean ridges. Forward modeling of the magnetic data (combined with geochronological data) …
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A NUMERICAL STUDY OF NONLINEAR VISCOELASTIC FLOW AND NONISOTHERMAL POWER-LAW FLOW
… fluid flow extends the Maxwell equation of linear viscoelasticity to the non-linear region by letting both relaxation time and elastic modulus depend upon the existing structure. Based on the calculations for a 3:1/1:3 contraction/expansion geometry with fully developed simple shearing flows …
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Development of ABAQUS-MATLAB Interface for Design Optimization using Hybrid Cellular Automata and Comparison with Bidirectional Evolutionary Structural Optimization
… suits well for the role when extended into a non-linear region.
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Creep Behavior Of Thin Laminates Of Iron-Cobalt Alloys For Use In Switched Reluctance Motors And Generators
… steady state behavior to another. This second linear region was then followed by the tertiary stage. The relationship between the tensile response and the creep responses is discussed. Analyses of the mechanical behavior includes double linear regression of empirically modeled data, scanning …
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Micromechanisms of paperboard deformation
… loaded in out-of-plane compression behaved linearly at small strains, with an exponential increase in stiffness at larger strains. Deformation mechanisms included void closure and fiber collapse. In out-of-plane shear, paperboard initially behaved linearly, but departed from linearity before …
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Analysis of RF Front-End Non-linearity on Symbol Error Rate in the Presence of M-PSK Blocking Signals
Radio frequency (RF) receivers are inherently non-linear due to non-linear components contained within the RF front-end such as the low noise amplifier (LNA) and mixer. When receivers operate in the non-linear region, this will affect the system performance due to intermodulation products, and …
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