Thesis (M.S.)--Mississippi State University. Department of Electrical and Computer Engineering. / Title from openning screen viewed Apr. 22, 2001. Includes bibliographical references.

Thesis (Ph. D.)--University of Texas at Austin, 2001. / Vita. Includes bibliographical references. Available also from UMI/Dissertation Abstracts International.

Thesis (M. Eng. Sc.)--University of Queensland, 2002. / Includes bibliographical references.

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This dissertation is a study of the composition dynamics of multicomponent distillation in a plate column. A ten-plate bubble-cap distillation column 21 feet in length with a two-foot inside diameter and a one-foot plate spacing was used. There were 22 two-inch bubble caps per plate. The feed system consisted of benzene, n-heptane, toluene, and xylene. Three experimental tests were analyzed; (1) a steady state test in which there was no forcing of the feed stream composition, (2) a transient test in which the feed stream benzene concentration was increased for a twenty-minute period, and (3) a pulse test in which the feed stream benzene concentration was increased for a five-minute period. The sampling frequency for the steady state and transient tests was one sample per minute from the.liquid of each of the plates and the feed, bottoms, and reflux streams. The sampling frequency for the pulse test was one sample every thirty seconds from the liquid and vapor of each plate and from the three terminal streams. The dynamic periods of the transient and pulse tests were simulated by means of a digital computer program. The program was written to solve by a finite difference method the differential equations describing the composition dynamics of the column. The transient and pulse composition response functions were transformed into the frequency domain by means of numerical methods. Simple lumped parameter transfer functions were then fit to the frequency response plots derived from the experimental data. It was determined that the digital computer program used to simulate the composition variations gave satisfactory results in comparison with the experimental data. The method of determining the initial conditions of the dynamic simulation program by means of a steady state multicomponent distillation computer program proved to be satisfactory. / Ph. D.

Professional imaging systems, particularly motion picture cameras, usually employ larger photosites and lower pixel counts than many amateur cameras. This results in the desirable characteristics of improved dynamic range, signal to noise and sensitivity. However, high performance optics often have frequency response characteristics that exceed the Nyquist limit of the sensor, which, if not properly addressed, results in aliasing artifacts in the captured image. Most contemporary still and video cameras employ various optically birefringent materials as optical low-pass filters (OLPF) in order to minimize aliasing artifacts in the image. Most OLPFs are designed as optical elements with a frequency response that does not change even if the frequency responses of the other elements of the capturing systems are altered. An extended evaluation of currently used birefringent-based OLPFs is provided. In this work, the author proposed and demonstrated the use of a parallel optical window p ositioned between a lens and a sensor as an OLPF. Controlled X- and Y-axes rotations of the optical window during the image exposure results in a manipulation of the system's point-spread function (PSF). Consequently, changing the PSF affects some portions of the frequency components contained in the image formed on the sensor. The system frequency response is evaluated when various window functions are used to shape the lens' PSF, such as rectangle, triangle, Tukey, Gaussian, Blackman-Harris etc. In addition to the ability to change the PSF, this work demonstrated that the PSF can be manipulated dynamically, which allowed us to modify the PSF to counteract any alteration of other optical elements of the capturing system. There are several instances presented in the dissertation in which it is desirable to change the characteristics of an OLPF in a controlled way. / In these instances, an OLPF whose characteristics can be altered dynamically results in an improvement of the image quality. / by Branko Petljanski. / Thesis (Ph.D.)--Florida Atlantic University, 2010. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2010. Mode of access: World Wide Web.

This thesis presents a comparative analysis of various low-frequency sonar signature representations and their ability to discriminate between proud targets of varying physical parameters. The signature representations used include: synthetic aperture sonar (SAS) beamformed images, acoustic color plot images, and bispectral images. A relative Mean-Square Error (rMSE) performance metric and an effective Signal-to-Noise Ratio (SNReff) performance metric have been developed and implemented to quantify the target differentiation. The analysis is performed on a subset of the synthetic sonar stave data provided by the Naval Surface Warfare Center - Panama City Division (NSWC-PCD). The subset is limited to aluminum and stainless steel, thin-shell, spherical targets in contact with the seafloor (proud). It is determined that the SAS signature representation provides the best, least ambiguous, target differentiation with a minimum mismatch difference of 14.5802 dB. The acoustic color plot and bispectrum representations resulted in a minimum difference of 9.1139 dB and 1.8829 dB, respectively / by Brenton Mallen. / Thesis (M.S.C.S.)--Florida Atlantic University, 2012. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2012. Mode of access: World Wide Web.

Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1981. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Bibliography: leaves 53-54. / by Bruce Edward Bates. / B.S.