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Articles 7771 - 7800 of 10272
Full-Text Articles in Entire DC Network
Sgml-Based Publishing, Erinne G. Cheney
Sculpture In Space, Jui-Chang Liao
A Computer Program For The Extraction Of Bipolar Transistor Spice Models, Larry Duane Delaney
A Computer Program For The Extraction Of Bipolar Transistor Spice Models, Larry Duane Delaney
Theses
Each year semiconductor manufacturers spend millions of dollars in the development of new products. It can be very costly to create on silicon a newly developed circuit, especially if it is not very manufacturable or poorly designed. To eliminate risk it is of utmost importance that circuit simulation be done correctly in the early stages of development. Simulation can only be as good as the model being used. Almost all designers whether digital, analogue, or mixed mode use SPICE to simulate their circuits. SPICE accuracy is inherently dependent on the discrete element models being used, i.e. transistors, diodes, mosfets. Development …
Color Logic: Interactively Defining Color In The Context Of Computer Graphics, Brian J. Rose
Color Logic: Interactively Defining Color In The Context Of Computer Graphics, Brian J. Rose
Theses
An attempt was made to build a bridge between the art and science of color, utilizing computer graphics as a medium. This interactive tutorial presents both technical and non-technical information in virtually complete graphic form, allowing the undergraduate college student to readily understand and apply its content. The program concentrates on relevant topics within each of the following aspects of color science: Color Vision, Light and Objects, Color Perception, Aesthetics and Design, Color Order, and Computer Color Models. Upon preliminary completion, user-testing was conducted in order to ensure that the program is intuitive, intriguing, and valuable to a wide range …
Syntheses And Comparative Studies Of 5-Membered Rig Sulfone Frameworks, David Engel
Syntheses And Comparative Studies Of 5-Membered Rig Sulfone Frameworks, David Engel
Theses
New sulfone derivatives were prepared and characterized for use as organic electron-transport agents (ETA). The novel sulfone framework is isomeric to the already existing 4-(dicyanomethylene)-4H-2-phenyl-benzo[b]thiapyran-1 ,1 -dioxide (BbPS). The materials were coated over electrophotoactive films in order that electronmobility and photodischarge experiments could be preformed. The electrophotograhic data of the new materials compared to BbPS showed slower film speed, a similar dark decay and higher electron-mobility.
Applications Of Fourier-Based Features For Classification Of Synthetic Aperture Radar Imagery, David G. Ehrhard
Applications Of Fourier-Based Features For Classification Of Synthetic Aperture Radar Imagery, David G. Ehrhard
Theses
A method for segmenting synthetic aperture radar (SAR) images has been developed to operate primarily in the frequency domain. It is based on and was tested against a similar method which involves isolating information of the frequency-domain image that defines unique textural features within a class. The comparison involved classifying four simple vegetation SAR scenes with both segmentation methods. A statistical test was then performed against the null hypothesis that the new textural segmentation method is as accurate or more accurate than the original method based on random pixel classification results. All tests concluded that the texture extraction methods are …
A Field Emission Transistor Array For Writing Applications, Todd C. Sieger
A Field Emission Transistor Array For Writing Applications, Todd C. Sieger
Theses
This work involved the development of a unique imaging device utilizing vacuum microelectronic field emitter tip arrays (FEAs) and CCDs. The device offers the potential for higher resolution than any other write head technology (such as LED and laser etc.) currently used in Xerographic copiers and computer printers. In addition, the possibility of true-color output exists. A discussion of the CCD Emitter's applications and advantages over existing devices will be presented. As part of the development of the device, layouts for a 10-pixel linear array device and other test structures were created as part of a CCD/FEA test chip. The …
New York State Urban Cultural Park System, Jeanne S. Fagan
New York State Urban Cultural Park System, Jeanne S. Fagan
Theses
This study focused upon the New York State Urban Cultural Park System (UCP) . An urban cultural park is a designated historical area in a community which has been revitalized to interpret the community's role in the cultural development of the region and state. Unlike typical green space "parks", the UCP will include the areas where residents work, live and play- The roles of Cultural Tourism and Tourism Development in the UCP were investigated. Interviews of individuals involved in the planning, development and implementation of the UCP were conducted. Site visitations were conducted to several of the UCP communities. The …
Blood Pressure Monitoring System, Fa-Liang Wang
Blood Pressure Monitoring System, Fa-Liang Wang
Theses
In order to control disease and survive, humans have been struggling thousands of years with the expenditure of human energy and money. We retain the heritage of our ancestors' medical knowledge, and develop our accumulated medical technology for ourselves and our offspring. Human are still seeking convenient, continuous and accurate methods for obtaining data that can be read directly from our body in order to control disease. Some of these methods are: taking urine to identify many diseases , sampling serum to check for plasma glucose, and applying a sensor to measure blood pressure and pulse rate.
Computers In College Art And Design Programs, Marla Jo Keating
Fashion In Sculpture, Yi-Meei Wang
Fiber Optic Sensor Based On Dual Ring Resonator System, Chenjun Fan
Fiber Optic Sensor Based On Dual Ring Resonator System, Chenjun Fan
Theses
A comprehensive study of fiber optic sensors based on a dual ring resonator system has been conducted. A new theoretical model is established for a single fiber optic ring resonator. The performance of fiber optic sensors based on the dual ring resonator system is then analyzed, based on this model. The best configuration for the dual ring resonator system is determined in terms of the shot-noise-limited minimum detectable phase change, as well as the environmental stability when polarization crosstalk is present. The relationship between the coherence length of semiconductor light sources and the resonator loop lengths is investigated, with the …
Electronic Properties Of Sensitizer Centers, Dan Zhang
Electronic Properties Of Sensitizer Centers, Dan Zhang
Theses
This investigation expands on previous photographic studies of the sensitivity of sulfur and sulfur-plus-gold sensitized octahedral AgBr emulsions to long wavelength light. The experimental atmosphere was controlled by a variable temperature vacuum sensitometer which reduced the oxygen and moisture content of emulsion coatings and thereby improved the efficiency of long wavelength sensitivity. The relative sensitivity at long wavelengths was determined as a function of wavelength, sensitizer level, and sensitizer type. The activation energy actually measures the energy for a hole release from an excited sensitizer center and not for an electron release as earlier work has claimed. By correlating the …
Characterization Of Dichroism And Linear Polarization Effects On Colorimetric Properties Of Plastic Transmitting Materials, Richard W. Riffel
Characterization Of Dichroism And Linear Polarization Effects On Colorimetric Properties Of Plastic Transmitting Materials, Richard W. Riffel
Theses
Polarization is not a new phenomenon. However, in some applications polarization can be a contributing factor to colorimetric mismatch between samples When investigating polarization effects, most work has centered on the application of circular polarization on absorption spectroscopy in organic molecules. However, little if any colorimetric research on plastic materials has been done. Given the fact that linear polarization is a naturally occurring phenomenon, the dichroic effect is further highlighted in some end-user applications. The current research defines a technique for characterizing the linear-polarization-induced dichroic effect in a transmitting plastics application. Included in the work is the description of a …
Eco Battery Exchange System, Rit Kasetsuwan
Evaluation Of Digital Image Compression Algorithms For Use On Lap Top Computers, Bernard V. Brower
Evaluation Of Digital Image Compression Algorithms For Use On Lap Top Computers, Bernard V. Brower
Theses
A technique for the evaluation of image compression algorithms was developed. This technique was then applied in the evaluation of six image compression algorithms (ARIDPCM, ISO/JPEG DCT, zonal DCT, proprietary wavelet, proprietary sub-band coding and the proprietary DCT). Of the six algorithms evaluated, the Wavelet algorithm performed the best on average in image quality at all bit rates. The JPEG DCT was concluded to be the most useful algorithm because of its performance and the advantages that come with being an international standard.
Aberrations Of Thick Phase Holographic Optical Elements, Hong Ouyang
Aberrations Of Thick Phase Holographic Optical Elements, Hong Ouyang
Theses
The wavefront quality of reconstructions from thick holographic optical elements (HOEs) is examined both theoretically and experimentally. The goal of this thesis is to verify the equations of the third-order aberration of HOE's by directly examining the reconstructed wavefront. In addition, possible limitations of holographic materials on HOE performance at low F-numbers and for various recording geometries are determined. The third objective is to test the wavelength shift aberration and to establish the extent to which misalignment can be used to compensate the aberration due to a shift in wavelength.
Integrating Computer Generated Animation And Videography, Annemaria Incorvia
Integrating Computer Generated Animation And Videography, Annemaria Incorvia
Theses
This thesis developed as a personal exploration in the compositing effects of computer generated imagery, traditional cel animation, and videography. Through trial, great error, and much modification, this collaboration evolved. As a product of transition and progression, it can be said, it echoes the absolute design process. In order to create a visually aesthetic ensemble while incorporating several techniques, each exploration was to support the whole in its depiction. Personal aesthetics and technical limitations determined the inclusion or abstraction of any particular approach, and to what degree, if any, that it would be used, modified or manipulated. Finally, these decisions …
Design And Evaluation Of A Screen-Ccd Imaging System For Medical Radiology, Jing Zhao
Design And Evaluation Of A Screen-Ccd Imaging System For Medical Radiology, Jing Zhao
Theses
A novel imaging system consisting of an X-ray source, an intensifying screen, optical coupling and a cooled CCD camera, for use in medical radiology was designed and evaluated, both theoretically and practically. Various characteristics of the system were analyzed and measured. It is concluded that the quality of images obtained with this system are comparable to or higher than those obtained using conventional systems.
Biomechanics Of Corneal Wound Healing, James Charles Ramier
Biomechanics Of Corneal Wound Healing, James Charles Ramier
Theses
The re-establishment of tissue continuity, function, and mechanical proper ties after a through-and-through incision is an important issue in corneal surgery and trauma. Variations in healing can affect vision and patient activity during the recovery period, which may last up to five years. Growth factors introduced into the open wound have the potential to speed up the wound-healing process. The current investigation is concerned with quantitatively characterizing the mechanical properties of corneal tissue and evaluating the effects of epidermal growth factor (EGF), insulin-like growth factor (IGF), and platelet-derived growth factor (PDGF) on accelerating the wound-healing process as compared to a …
Wall Works: Painting As Record And Revelation, Donna Kristoff
Addition Of Arenesulfenyl Chlorides To Quadricyclene, Robert J. Niger
Addition Of Arenesulfenyl Chlorides To Quadricyclene, Robert J. Niger
Theses
The addition of arenesulfenyl chlorides to quadricyclene has been investigated. These reactions are rapid, exothermic and yield primairly three isomers. Two of the isomers (type I and type II structures) have the norbornene and nortricyclene carbon skeletons respectively. The structure of the nortricyclene isomer has been thoroughly established with a wide variety of techniques including 2D NMR. It has been found that a bridged sulfonium ion is not an important product precurser in these electrophilic addition reactions. In a attempt to force the formation of a bridged ion, preliminary studies using arenesulfenyl chlorides in which the aromatic ring contains electron-donating …
Rheumatoid Arthritis And Myasthenia Gravis As Examples Of Autoimmune Diseases, Michael Collins
Rheumatoid Arthritis And Myasthenia Gravis As Examples Of Autoimmune Diseases, Michael Collins
Theses
None provided.
Enhancements To Atmospheric-Correction Techniques For Multiple Thermal Images, Robert J. Mericsko
Enhancements To Atmospheric-Correction Techniques For Multiple Thermal Images, Robert J. Mericsko
Theses
Statistical estimation problems of atmospheric correction techniques for thermal infrared imagery have been studied. A revised multiple-view- angle atmospheric correction technique has been developed and tested using the LOWTRAN radiative transfer model as truth. Its average absolute temperature prediction accuracy for an independent data set is 0.8 K for long-wave infrared imagery and 1.0 K for mid -wave infrared imagery, when error-free data are assumed. The benefit of robust, resistant regression estimators was studied using Monte Carlo simulations having real -world measurement errors and data outliers. An error propagation analysis showed that 1.0-3.3 K of rms error is likely given …
Development Of A Ti:W Salicide-Nitride Based Multi-Layer Metallization For Vlsi Application, Kevin L. Witt
Development Of A Ti:W Salicide-Nitride Based Multi-Layer Metallization For Vlsi Application, Kevin L. Witt
Theses
A multilayer metallization based upon an alloy of Titanium and Tungsten (30:70 atomic %), has been developed and evaluated. Using AES, XPS and RBS analysis techniques, a process to simultaneously form a refractory oxy-nitride diffusion barrier over a silicide contact has been characterized. By placing 300 Angstrom films' of Ti:W in an 800 mTorr ammonia environment at 800C, it is been demonstrated that silicides and oxy-nitrides of Titanium and Tungsten form in layers, with an overall thickness of 540 Angstroms. A test chip has been designed and fabricated using an nMOS process including the new metallization. Utilizing test structures such …
Quantitative Evaluation Of Six Multi-Spectral, Multi-Resolution Image Merger Routines, Gustav J. Braun
Quantitative Evaluation Of Six Multi-Spectral, Multi-Resolution Image Merger Routines, Gustav J. Braun
Theses
Currently, most image merger routines are judged on the enhanced appearance of the hybrid imagery that they create. Little or no quantitative analysis is given which represents a technique's ability to preserve the radiometry of the hybrid imagery. For this reason, a quantitative analysis of six multi-resolution, multitemporal, multi-sensor, multispectral image merger routines was performed. These techniques were designed to incorporate the high resolution spatial information of a panchromatic image with the spectral information of a low resolution multispectral image. The panchromatic imagery came from the French satellite Systeme Pour l'Observation de la Terre (SPOT) and the multispectral imagery came …
Cicc Information System, Chang-Mei Lin
Cicc Information System, Chang-Mei Lin
Theses
The CICC Information system is an interactive media project simulated to be provided by the Chinese Information and Culture Center (CICC). It provides various Chinese information and the CICC services via the telecommunication network between the end-users' computer and the terminal of the CICC. Through this connection, the user can not only search the Chinese art and culture information they are interested in, but also acquire the services providing by the CICC Library, Taipei Gallery and Taipei Theater. The intention of this project is to design an electronic information system for the real world. Both interface design and audio-visual aspect …
Mathematical Modeling Of Incompressible Flow Through A Collapsible Tube, Jennifer L. Lowdermilk
Mathematical Modeling Of Incompressible Flow Through A Collapsible Tube, Jennifer L. Lowdermilk
Theses
An in-depth examination of eight articles pertaining to collapsible tube phenomenon is provided. Experimental models and mathematical models are explored. Two mathematical models are developed by the author, each of which attempt to reproduce experimental data provided by Lyon [37]. Respective models produce sets of coupled differential equations, and Advanced Continuous Simulation Language (ACSL) is utilized to solve these equations. Neither of the author's models provides total numerical reproductions of the experimental data under consideration. However, general trends are obtained which correspond to those observed in Lyon's data. General responses to variations in system parameters are provided for both models.
Substituted Aromatic Polyesters: Degradation Studies, Scott Lee
Substituted Aromatic Polyesters: Degradation Studies, Scott Lee
Theses
Two liquid crystalline aromatic polyesters were studied by isothermal degradation techniques. Both polymers contain a common phenyl side chain group. However, one contains a styryl side chain and the other contains an a-methylstyryl side chain. Isothermal degradations under nitrogen and air were carried on both polymers. From the GC/MS analysis of the cold traps, it showed that both polymers gave off benzene or oxygenated benzene related products. Homopolymers containing only phenyl or a-methylstyryl side chain were prepared by solution polymerization techniques. Then isothermal degradation under air were also carried out on both homopolymers. The GC/MS analysis showed that the a-methylstyryl …
Light Scattering Study Of Attractive Interactions In A Model Microemulsion System, Dawn M. Campbell
Light Scattering Study Of Attractive Interactions In A Model Microemulsion System, Dawn M. Campbell
Theses
Static and dynamic (photon correlation spectroscopy) light scattering studies were conducted on AOT/WATER/n- DECANE microemulsions near room temperature. The molar ratio of water to AOT was varied from W = 20 to 30. The volume fractions of the studied microemulsions ranged from $ = 0.03 to 0.45. Static light scattering data was modeled by a theory based on attractive perturbations to hard spheres. From the model, values for A, the attractive perturbation to the second virial coefficient, were determined. It was found that A is an increasing function of W. Photon correlation spectra were analyzed in terms of an adhesive …