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Articles 9661 - 9690 of 10269
Full-Text Articles in Entire DC Network
Pepperoni On One Half, Mushrooms On The Other, Tobi Miller
A Digital Signal Processing System Developed For The Optimal Use Of High Density Magnetic Storage Media, Victor Hernandez
A Digital Signal Processing System Developed For The Optimal Use Of High Density Magnetic Storage Media, Victor Hernandez
Theses
High density data recording has traditionally been an essential factor in the development of communication and transmission systems. However, recently more sophisticated applications, including video recording, have necessitated refinements of this technology. This study concentrates on the signal processing techniques used to inhance the packing density of stored data. A comparison of the spectral mapping characteristics of different codes illustrates that the need for equalization can be eliminated and that significant bandwidth reduction can be achieved. Secondly, consideration is given to the deleterious effects of flutter, its associated effects on high density data recording, and the constraints imposed on the …
Quantitative Analysis Of Phenidone And Derivatives In Photographic Developing Solutions, Charles Augello
Quantitative Analysis Of Phenidone And Derivatives In Photographic Developing Solutions, Charles Augello
Theses
Spectrophotometric analysis and visual titration methods have been applied to the determination of Phenidone, its 4-methyl and 4, 4-dimsthyl derivatives, in photographic developers. The visual titration method is modified to allow for variation due to operator technique. Spectrophotometric methods are utilized for the identification of the Phenidone derivative in the Kodak process E-6 first developer. The derivative is believed to be Dimezome at 0.3 g/l.
The Quantitative Identification Of E-6 Chemical Processing Errors, Peter Buck, Donald Betz
The Quantitative Identification Of E-6 Chemical Processing Errors, Peter Buck, Donald Betz
Theses
This thesis contains descriptions of current methods of identifying chemical processing errors, followed by a description of a proposed method for quantitatively identifying chemical processing errors. The goal of this research is to determine the relationships between chemical deviations in the first developer of Kodak Color Reversal Process E-6 and the resulting changes in the sensitometric parameters of Kodak film type Ektachrome 64 Professional (Daylight). These relationships are presented in graphical form in a section of this thesis entitled "Results and Conclusions".
Design Of A Stepped Diaphragm Intensity Scale Sensitometer, Patrick Meehan
Design Of A Stepped Diaphragm Intensity Scale Sensitometer, Patrick Meehan
Theses
Design of a Stepped Diaphragm Intensity Scale Sensitometer for testing the photographic response of Graphic Arts materials is presented. The sensitometer utalizes a stepped area target and a cylindrical lens to produce a stepped illuminance distribution at the film plane. A computer aided study is used to find the optimum lamp positions with respect to the reflector.
A Technique For Calculating Atmospheric Scattering And Attenuation Effects Of Aerial Photographic Imagery From Totally Airborne Acquired Data, A.J. Szydlik
Theses
Image degradation of color aerial photography due to atmospheric effects is spectrometrically evaluated as a function of air column depth for the purpose of defining corrective terms for the conditions under which the particular imagery was acquired. The theoretical development illustrates how these terms may be used to 'subtract out' the atmospheric effects of back-scatter and attenuation from the imagery. The technique suggests that true spectral information of ground objects can be calculated despite the presence of atmospheric effects during aerial photo graphic data collection. To determine the validity of the technique, the totally airborne method results are compared to …
The Cqdrng8 - A Quadratic, Isoparametric, Axisymmetric Finite Element For The Nastran Computer Program, John Gray
Theses
The development of an axisymmetric ring finite element is presented and FORTRAN subroutines for implementing the capability into the MSC/NASTRAN finite element program are given. The element is an eightnoded isoparametric quadrilateral of quadratic order. The following matrices and capabilities are developed: 1. stiffness matrix for homogeneous isotropic materials, 2. thermal conductance matrix for homogeneous isotropic materials, 3. calculation of equivalent nodal forces due to temperature loads, 4. calculation of stresses, and 5. plotting of undeformed and deformed structures. Several classical thermal and structural problems are solved to demonstrate these capabilities. In all cases, the element results compare well with …
Increasing Visual Detectability In Reduced Exposure Mammography By Contrast Adjustment, Stuart Richer
Increasing Visual Detectability In Reduced Exposure Mammography By Contrast Adjustment, Stuart Richer
Theses
The radiobiologic level from an average direct-exposure, fine-grain mammograph approaches 4000 millirads. Copying reduced-exposure mammographs onto high gradient films yields a method of reducing radiation to the patient by a factor of 2. A mathematically based tone-reproduction system was developed in an attempt to produce acceptable facsimile images from a series of reduced-exposure mammographs. Acceptability was tested by radiologists using a sensitometric phantum. The radiologists were asked to quality rank a full exposure mammograph, facsimile mammographs, and a film-screen mammograph in terms of detectability of size and number of calcifications. Based on evidence, there is reason to believe that a …
An Analysis Of Kirlian Electrophotography, Robert Suba
An Analysis Of Kirlian Electrophotography, Robert Suba
Theses
The objective of this research effort was to investigate the process of Kirlian electrophotography with respect to the physical processes which occur during the exposure, and the electrical parameters of the exposing device. This project was not intended to discuss what possible parapsychological phenomina are revealed by Kirlian electrophotography, or it's possible applications. The following is a list of conclusions which were drawn from the experimentation. 1) The Kirlian image is a result of a complex process known as field emission of conducting objects under an applied high voltage AC field. Furthermore, it is the belief of the author that …
Finite Element Analysis And Program For Stokes Fluid Flow, Jeffrey Steele
Finite Element Analysis And Program For Stokes Fluid Flow, Jeffrey Steele
Theses
The theory and computer program for finite element analysis of Stokes (creeping) fluid flow is presented. The element is an eight node, two dimensional isoparametric quadrillateral. The element is formulated directly from the Stokes equations of motion, a special case of the Navier-Stokes equations where inertia terms are dropped, using the method of weighted residuals with Galerkin's criterion applied. Velocities in two directions are solved for at all eight nodes while pressure is solved simultaneously at the four corner nodes only. Several test cases have been run with the program. Very good accuracy was achieved in modeling velocity profiles for …
Interaction Of Bromide And Organic Antifoggants In Development, Miriam Decastro, Kim Eisenberg
Interaction Of Bromide And Organic Antifoggants In Development, Miriam Decastro, Kim Eisenberg
Theses
Various levels of bromide and an organic antifoggant, benzotriazole, were combined in a developer and investigated to determine if an interaction existed. Both nitrogen burst agitation and viscous development were used. It was found that benzotriazole is such a strong antifoggant that interaction occurs only at low density levels, and the influence of benzotriazole increases with development time.
Art, Dream And Spontaneity, Karen Schory
The Question Of Style In Daguerreotype And Calotype Portraits By Antoine Claudet, Linda Vance Sevey
The Question Of Style In Daguerreotype And Calotype Portraits By Antoine Claudet, Linda Vance Sevey
Theses
Not provided.
Symbol Making And The Creative Process, Paula Pate
Structured Spacial Concepts, James Veatch
Naksha-I-Gashta: A Changed Design, Philip Smith
A Modification Of The Fourier Transform Model In Visual Perception, Bruce Apgar, William Harris
A Modification Of The Fourier Transform Model In Visual Perception, Bruce Apgar, William Harris
Theses
As for photographic systems , the human visual system can also be described by an MTF. However, due to the complexity and non-linearity of the visual system, the MTF alone is a poor predictor of response. We have formulated and tested two mathematical models which modify the MTF of the eye. Effectively, an imperfect integrating function (low pass filter) has been proposed to be operating on stimuli which are sent to the brain. The models were tested and found to be better predictors of visual response than the present MTF alone.
The Influence Of Press Variables And The Measurement Of Show Through Of Paper, William Nourse
The Influence Of Press Variables And The Measurement Of Show Through Of Paper, William Nourse
Theses
Several fundamental questions are discussed relating to show through of ink on paper. These questions relate to (a) the significance of ink and press variables in regard to show through; (bj the correlation between the light reflectivity of an ink film thickness and the show through of the ink; (c) the correlation between the percentage of pigment in the ink, and the show through of ink; (d) the interchangeability of various instruments for the measurement of show through. Data is obtained using a standard offset ink in combination with several different kinds of paper. Several, different known ink film thicknesses …
Recognition Thresholds For The Spectrally Opponent Neural Network In The Human Visual System, Douglas Smith
Recognition Thresholds For The Spectrally Opponent Neural Network In The Human Visual System, Douglas Smith
Theses
Recognition thresholds for an alphanumeric resolution test object of differing target/background chromaticities and equal luminosities were determined. Combinations of the four psychologically unique hues were studied, and those pairs corresponding to the green-red and yellow-blue opponent neural systems were found to give the highest visibilities. Equivalent achromatic contrasts for each of the presented color pairs were determined, and comparison of the results with achromatic data of other researchers shows clearly that the spectrally opponent neural network in the human visual system is much less efficient in processing spatial information than is the spatially opponent (achromatic) neural network.
Effects Of Polyox In Fountain Solution, Jacob Varughese
Effects Of Polyox In Fountain Solution, Jacob Varughese
Theses
"Polyox" is a polymer of ethylene oxide. It is soluble in water and commercially available. The effects of Polyox in fountain solutions were studied and evaluated. The same concentration (one-half percent of Polyox in water) at different pH and blending times, was tested for physical properties and printability. The physical property tests made were of viscosity, surface tension and contact angle. The printability tests were conducted as roll-up, ability to clean up the plate, resistance to scumming, printing sharpness and resolution properties. The experiments were conducted under controlled press conditions and the properties of each test solution were reported. Roll-up, …
The Spatial Installation Of Painting, John Benzel
A Comparison Of The Patterns Formed By Primary Textile Structures And Their Photographic Abstraction, Pamela Perlman
A Comparison Of The Patterns Formed By Primary Textile Structures And Their Photographic Abstraction, Pamela Perlman
Theses
Not Included
Group Treatment Of Anorgasmia, Mona Lavine
The Creative Kit: A Portfolio Of Graphic Imagery To Introduce The Graphitek 430 Camera/Processor System To The Visual Communications Market, Barry Hincks
Theses
None provided.
An Investigation Of Solid Ink Density Variation As Determined By The Acceptability Of Overprints In Process Color Printing, John G. Gaston Iii
An Investigation Of Solid Ink Density Variation As Determined By The Acceptability Of Overprints In Process Color Printing, John G. Gaston Iii
Theses
In order to establish limits which are representative of the allowable variation in solid ink density (SID) of the single process colors, as determined by the allowable variability of their overprints, a study was conducted utilizing fourteen (14) experienced color observers selected from printing companies in the Greater Rochester area. Printed color patches, at the 70% tint level of cyan, magenta, yellow, red (M+Y) , green (Y+C) , blue (M+C) and three-color overprints (Y+M+C) , were shown to observers, individually. In each group, the observer was asked to accept or reject the patch when compared to the reference standard in …
Left And Right Brain Hemispheres And Their Effect On Creativity, Catherine Hraber
Left And Right Brain Hemispheres And Their Effect On Creativity, Catherine Hraber
Theses
None provided.
Solution Of The Transonic Potential Flow Equation By Finite Differences For The Hydraulic Analogy, Ewan Choroszylow
Solution Of The Transonic Potential Flow Equation By Finite Differences For The Hydraulic Analogy, Ewan Choroszylow
Theses
A numerical procedure is presented for the solution of the transonic potential flow equation around an isolated airfoil, for the hydraulic analogy. The numerical method used was the finite difference method, appropriately modified for a mixed elliptichyperbolic system of equations. Potential flow analysis was used, since for all practical purposes, the flow is inviscid throughout the flow field, except for wake regions and boundaries. The mixed finite difference scheme has proven to be an effective technique in the solution of elliptic and hyperbolic flow problems. For conditions near the wave propagation velocity (sonic velocity), difficulties have arisen in proper solution …
The Development And Utilization Of A Radio Station In The Secondary School, Daniel P. Bretch
The Development And Utilization Of A Radio Station In The Secondary School, Daniel P. Bretch
Theses
Not available.
Porcelain Families, Ingrid Bogel
Massachusetts: Bicentennial Begins Here, Elaine Milton