Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1992. / Vita. Abstract. Includes bibliographical references (leaf 215). Also available via the Internet.

Thesis (M.S.)--West Virginia University, 2006. / Title from document title page. Document formatted into pages; contains xii, 153 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 133-135).

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The prime result has been the development of an experimental procedure for producing a definite dielectric effect when water is added to an acetone solution of cellulose nitrate. This effect depends not only on the purity, dryness and concentration of the cellulose nitrate, but also on the average degree of polymerization. This last dependency is shown in Figure V, and its theoretical aspects will be discussed in the next section. The discontinuity at the precipitation region is a general effect, not depending on such extreme conditions. / M.S.

Cheng Kwok Kei = 高分子電解質-膠體複合體系的相互作用和極化率 / 鄭國基. / Thesis submitted in: November 2004. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2005. / Includes bibliographical references (leaves 68-73). / Text in English; abstracts in English and Chinese. / Cheng Kwok Kei = Gao fen zi dian jie zhi-jiao ti fu he ti xi de xiang hu zuo yong he ji hua lü / Zheng Guoji. / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Polyelectrolyte Colloid Complex --- p.1 / Chapter 1.2 --- Image charges --- p.3 / Chapter 1.3 --- Objective of the thesis --- p.3 / Chapter 2 --- Equations for induced image charges (Review) --- p.5 / Chapter 2.1 --- Introduction --- p.5 / Chapter 2.2 --- Image effect --- p.6 / Chapter 2.2.1 --- The potential --- p.6 / Chapter 2.2.2 --- Surface charge density --- p.8 / Chapter 2.2.3 --- Potential energy --- p.9 / Chapter 3 --- Polarizability of a polyelectrolyte colloid complex --- p.11 / Chapter 3.1 --- Introduction --- p.11 / Chapter 3.2 --- The Simulation Model --- p.12 / Chapter 3.2.1 --- Energy of the Complex --- p.13 / Chapter 3.2.2 --- Dipole of the Complex --- p.15 / Chapter 3.2.3 --- Thermal Energy --- p.18 / Chapter 3.3 --- Calculating Method --- p.18 / Chapter 3.3.1 --- Monte Carlo Simulation --- p.19 / Chapter 3.3.2 --- Partition Function Calculation --- p.20 / Chapter 3.4 --- Polarizability --- p.22 / Chapter 3.4.1 --- Compare polarizability of the complex with a permanent dipole --- p.22 / Chapter 3.4.2 --- Results and Discussion --- p.23 / Chapter 3.5 --- Effect of image charges for the complex --- p.33 / Chapter 3.6 --- Conclusion --- p.37 / Chapter 4 --- Correlation and Interaction of complexes - without induced charges --- p.38 / Chapter 4.1 --- Introduction --- p.38 / Chapter 4.2 --- The Simulation Model --- p.39 / Chapter 4.2.1 --- Energy of the system --- p.40 / Chapter 4.2.2 --- Dipole Moment --- p.42 / Chapter 4.3 --- Results and Discussion --- p.43 / Chapter 4.3.1 --- Polarizability of complex --- p.43 / Chapter 4.3.2 --- Correlations between two complexes --- p.46 / Chapter 4.3.3 --- Potential of mean force --- p.50 / Chapter 4.4 --- Conclusion --- p.52 / Chapter 5 --- Correlation between Two Complexes - with induced charges --- p.53 / Chapter 5.1 --- Introduction --- p.53 / Chapter 5.2 --- Induced Surface Charges --- p.54 / Chapter 5.2.1 --- Surface charges --- p.54 / Chapter 5.2.2 --- Energy of system --- p.55 / Chapter 5.2.3 --- Dipole Moment --- p.57 / Chapter 5.3 --- Results and Discussion --- p.58 / Chapter 5.3.1 --- Polarizability of complexes --- p.59 / Chapter 5.3.2 --- Correlation between two complexes --- p.61 / Chapter 5.3.3 --- Potential of mean force --- p.63 / Chapter 5.4 --- Conclusion --- p.64 / Chapter 6 --- Summary --- p.66 / Bibliography --- p.68 / Chapter A --- Mathematical calculation of the dipole moment of a complex --- p.74 / Chapter A.1 --- Equation of mean squared dipole --- p.74 / Chapter A.2 --- z-component of dipole and squared dipole --- p.76

Lui Man Leung. / "May 2004." / Thesis (Ph.D.)--Chinese University of Hong Kong, 2004. / Includes bibliographical references. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.

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Structure evolution of silica aerogel was studied in microwave- and conventionally processed samples over the temperature range from 25 to 1200â °C. The samples were produced using sol-gel processing and dried under carbon dioxide supercritical conditions. After drying, the monolithic samples received a thermal treatment at different programmed temperatures in two different ovens, conventional and microwave. The microwave process was performed using a single mode microwave oven at 2.45GHz. Dielectric properties were measured using the cavity perturbation method, and structural characterization was carried out using a variety of techniques, including absorption surface analysis, Helium pycnometry, Archimedes principle, Fourier transform infrared spectroscopy, X-ray diffraction, and high resolution microscopy. The data obtained revealed that structural differences do exist between microwave- and conventionally processed samples. Three different regions were identified from the structural characterization of the samples. Regions I exhibited a structure densification at temperatures between 25 and 850â °C. Region II was characterized by a bulk densification in the temperature range from 850 to 1200â °C. Region III was represented by the onset of crystallization above 1200â °C. Explanation and possible causes behind the structural differences observed in each region are provided. In general, the structure evolution observed in microwave- and conventionally processed samples followed the same order, but occurred at lower temperature for the microwave process. / Ph. D.

This dissertation summarizes the research performed towards the development, analysis, and testing of two new sample configurations used for characterizing dielectric materials over a wide band of frequencies. In the two configurations, a cylindrical cavity completely filled with a sample of the dielectric material of interest is used. The two configurations are the following: 1. The cylindrical cavity is adapted to the end of a transmission line and the reflection coefficient is measured. The complex permittivity of the dielectric sample is then derived from the measured reflection coefficient information. 2. The cylindrical cavity is placed between two transmission lines. The complex permittivity of the dielectric material can be computed from either the measured reflection coefficient or the measured transmission coefficient. The full field analysis of these configurations is carried out and the solution is obtained using the method of moments. Computer simulation experiments are performed to test the sensitivity of these techniques and predict their performance. Actual experiments on some dielectric materials with known dielectric properties are performed for verification. The first configuration is also used to characterize two thick film dielectric materials. These configurations proved to provide solutions to the many problems with the conventional configurations found in the literature. / Ph. D.