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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

On the stabilization and related problems of beams

Liu, Chao, 劉超 January 2005 (has links)
published_or_final_version / Mathematics / Doctoral / Doctor of Philosophy
2

Theory of vibration of clusters of cylinders in axial flow

Curling, Llewelyn R. V. (Llewelyn Renard Vaughn) January 1982 (has links)
No description available.
3

Generalization of the Lindstedt-Poincaré method for analysis of non-linear vibrations

陳樹輝, Ch‘en, Shuhui. January 1990 (has links)
published_or_final_version / Civil and Structural Engineering / Doctoral / Doctor of Philosophy
4

Theory of vibration of clusters of cylinders in axial flow

Curling, Llewelyn R. V. (Llewelyn Renard Vaughn) January 1982 (has links)
No description available.
5

The impact of attached feature scales and spatial distributions on the response of structural-acoustic systems

Shepard, William Steve, Jr. 12 1900 (has links)
No description available.
6

Theory of vibration of clusters of cylinders in axial flow

Curling, Llewelyn R. V. (Llewelyn Renard Vaughn) January 1982 (has links)
No description available.
7

Vibration and stability analysis of plate-type structures under movingloads by analytical and numercial methods

鄭定陽, Zheng, Dingyang. January 1999 (has links)
published_or_final_version / Civil Engineering / Doctoral / Doctor of Philosophy
8

A NEW ANALYTICAL PREDICTOR OF GROUND VIBRATIONS INDUCED BY BLASTING.

Ghosh, Amitava, 1957- January 1983 (has links)
No description available.
9

Three-dimensional vibration analysis of structural elements using Chebyshev-Ritz method

Zhou, Ding, 周叮 January 2003 (has links)
published_or_final_version / abstract / toc / Civil Engineering / Doctoral / Doctor of Philosophy
10

Functional and Parametric Modeling Methods for PET Imaging Data

Shieh, Denise January 2023 (has links)
This thesis pertains to the uses of functional data analysis and nonlinear mixed-effects model with applications to PET data. In the first part of this dissertation, we consider a permutation-based inference for function-on-scalar regression. While PET imaging data analysis is most commonly performed on data that are aggregated into several discrete a priori regions of interest, our primary interest is on measures of 5-HTT binding potential that are made at many locations along a continuous anatomically defined tract, one that was chosen to follow serotonergic axons. Our goal is to characterize the binding patterns along this tract, determine how such patterns differ between diagnostic groups, and also to investigate the question of homogeneity. We utilize function-on-scalar regression modeling to make optimal use of our data and inference is made using permutation testing strategies that do not require distributional assumptions. Simulations are conducted to examine the validity of our methods and compare the performance of competing methods. We illustrate this approach by applying it to PET data. In the second part of this dissertation, we introduce shape-based distance metrics for comparison of IRFs. The common practice involves summarizing the estimated IRF using a single scalar measure, such as VT, and comparing it across subjects/groups using standard univariate analyses. However, this approach neglects the nature and structure of the IRFs and overlooks their shapes. We propose a k-nearest-neighbor ensemble approach that optimally combines distance metrics based on principles of functional data analysis and shape data analysis. Simulations are conducted to compare the predictive performance of our approach to the traditional approach of using VT. We illustrate this approach by applying it to PET data. In the third part of this dissertation, we discuss the a nonlinear mixed-effects modeling approach for PET data analysis under the assumption of a simplified reference tissue model. The conventional two-stage approach uses NLS estimates of the population parameters, although statistically valid, it is possible to allow for more complex models that consider all subjects simultaneously. We propose a nonlinear mixed-effects (NLME) model that can estimate not only the individual-level parameters, but also the effects of covariates on the parameters. In this way, estimation of kinetic parameters and statistical inference can be performed simultaneously. Simulations are conducted to compare the power for detection of group differences and population- and individual-level parameter estimation for both NLS and NLME models. We apply our NLME approach to PET data to illustrate the modeling procedure.

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