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 47 for “"perturbation technique"”.
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Testing the EPRI reactivity depletion decrement uncertainty methods
… decrements versus burnup. The analytical techniques used to infer measured assembly reactivities required perturbation calculations using 3D nodal diffusion core models. Subsequently, questions have arisen within the Nuclear Regulatory Commission (NRC) as to potential uncertainties in …
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Energy-turns analysis for a scramjet powered missile
… a scramjet missile is developed using a singular perturbation technique. The cruise analysis is briefly reviewed to determine the conditions at which the missile will cruise most efficiently. The turn and climb performance of the missile over the conditions of interest is then examined and a …
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Rotating perfect fluid bodies in Einstein's general theory of relativity
… the complexity may be eased by the adoption of a perturbation technique, in that a spherically symmetric non-rotating fluid sphere described by Einstein's equations is endowed with rotation, albeit slowly, and the result is expressed and analysed using Taylor's series.<br/><br/>A further …
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An accuracy study of central finite difference methods in second order boundary value problems
… equations are accurately solved by a perturbation technique which yields the error directly. A half station method, which corresponds to making finite difference approximations before expanding derivatives of function products in the differential equations, was found superior to two …
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Análise modal assintótica da estabilidade de estruturas reticuladas espaciais
… resulting from incremental displacements. The perturbation technique in a matrix form allows asymptotic approaches of primary and secondaries paths, to be calculated in an adequate form for computational purposes. The linearized critical equilibrium analysis is used in an alternative plus …
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Evaluation and design of polymer systems for enhanced microwave heating
… Dielectric measurements were made using a field perturbation technique and a transmission/reflection technique. The electric loss factor of the epoxy system continuously decreased during cure. Results for the microwave heating of the polypropylene-iron composites show that heating is enhanced …
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Modeling the microwave frequency permittivity of thermoplastic composite materials
… materials were measured using a resonant cavity perturbation technique at 9.4 GHz and 2.45 GHz. The permittivities of the composite specimens were measured using a reflection cavity technique at 9.4 GHz and 2.45 GHz. Simple" rule of -mixtures II models that use the fiber and plastic …
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Flexible dynamic modeling and control for the Remote Manipulator System
… flexible-joint control loop which is based on a perturbation technique. The last part is a pulse active damping (PAD) control loop which is applied to damp out the system residual vibrations in a fast manner. The integrated control strategy leads to fast end-effector trajectory tracking with less …
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Time optimal slewing of flexible spacecraft
… only by a penalty term in the cost functional. A perturbation technique is applied to further simplify this problem.
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Small and large deflection of clamped skew sandwich plates.
… numerically by means of the small parameter perturbation technique in conjunction with successive approximations. A computer programme coded in Fortran is written for the IBM 360/65. Clamped skew sandwich plates, with any arbitrary geometric dimension and material properties of the core and …
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Distributed Training with Heterogeneous Data: Bridging Median- and Mean-Based Algorithms
… global convergence to stationary solutions. Our perturbation technique can be of independent interest when one wishes to estimate mean through a median estimator.
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The effect of internal waves on long range acoustic propagation in the ocean
… an acoustic waveguide is investigated using wave techniques. Refractive index fluctuations due to the vertical displacements of the internal waves create an inhomogeneous waveguide. The analysis uses weak scattering theory based upon the Rytov perturbation technique. It is found that the internal …
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Role of fluctuations and defects in select condensed matter problems
… surfaces by invoking a small slope phase perturbation technique. The results suggest that smooth perturbations lead to deviations from the image theory results extensively used to interpret the experimentally observed single molecule lifetime changes.
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Nonlinear resonances in systems having many degrees of freedom
… excitations. The method of multiple scales, a perturbation technique, is used to develop a unified method for the study of the various resonances. The effects of an internal resonance are explored in depth. The first approximation obtained by the method of multiple scales extracts the dominant …
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Optimal redesign in the presence of system constraint perturbations
… developed. The first is a second order Classical Perturbation Analysis. The second is a labelling technique which involves the assumption of low constraint curvature near the optimal solution. These estimation procedures require the Hessians of the cost and constraint functions, and so, procedures …
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Flow of power law fluids with application to oil drilling
… boundary has a finite or infinite radius. A perturbation technique is used to produce the resulting equations for a slightly power law fluid which are solved using the finite element method. An asymptotic expansion is used to provide an analytical far field solution for the infinite outer …
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Non-Metric Multi-Dimensional Scaling for Distance-Based Privacy-Preserving Data Mining
… to protect private information. However, data perturbation can decrease the utility of the output. A good perturbation technique requires balance between privacy and utility. This study proposes a new method for data perturbation in the context of distance-based data mining. We propose the use …
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Stability of a reticulated dome under multiple independent loads
… each other. One program is based on the static perturbation technique and the other is based on an energy minimization technique. Program.solutions are compared with each other and with other published solutions. Various characteristics of the two programs are discussed. Five stability …
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Vibration control and design of composite cantilevers taking into account structural uncertainties and damage
… structure are also considered. As passive techniques of vibration control, structural tailoring and optimization are implemented. To deal with structural uncertainties, a probabilistic discretization technique for the governing system is developed. Statistical properties of natural …
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