Digital Commons Network^™

Image Mechanisms In Screenless Lithography, Charles Martin

Theses

In conventional lithography, a halftone screen is used to photographically convert the continuous- tone image of the original into a grid of very small, closely spaced dots of constant density but varying areas. Screenless or continuous-tone lithography is a printing process capable of reproducing images with gradated tones without the use of a halftone screen. Screenless lithography has a high quality potential because it has few of the inherent problems that limit the quality of the halftone process. This thesis investigates the image mechanisms in screenless lithography and in particular the role of variable water receptivity. It was hypothesized that …

The Landscape, 1975, John Cox

Theses

None provided.

Steady State Heat Transfer From A Double Ring Of Identical Spheres In A Regular Orientation, Evelio A. Melo

Theses

Solutions to Laplace's equation are obtained by the method of reflections for the problem of heat transfer from two parallel rings of spheres arranged in regular polygonal arrays. The mathematical models developed describe the rate of heat transfer and spatial temperature distribution due to an arbitrary number of identical spheres of equal surface temperature correcting Fourier's heat transfer equation for the interference caused by a multiparticle array. Although the method of solution is quite rigorous and can be used to obtain as accurate a solution as desired, only the second reflection was obtained, yielding a first order correction. The model …

Soluble Surfactant Effects On Gas Absorption Of Organic Compounds, Angelo C. Morresi

Theses

A literature search dating back to the beginning of this century turned up no previous work similar to ours. We discuss several methods and experiments involving the scrubbing of air streams.

The objective of this work was the determination of surfactant affects on the solubility of certain organic compounds of varying solubility in water. A means of simulating a packed tower was devised to allow for bench scale evaluation and thus enabled a greater number of organic compounds to be examined with a greater variety of surfactants.

Curves were plotted based on organic vapor concentration, surfactant concentration, organic type, surfactant …

Design And Construction Of A Low Frequency Mtf Camera, Howard Bozenhard, Jerry Covey

Theses

A low frequency Modulation Transfer Function Camera has been designed and constructed. Areal sinusoidal targets are imaged through a cylindrical lens and an objective lens to form transmission sinusoidal images. Modulation is changed by varying the background illumination. The range of available frequencies is from .3 to 30 cycles per millimeter, and the modulations available are 25, 33 44, 55 and 64%.

The Correlations And Validity Of Selected Community College Curriculums To Graduate Placement In The Industrial Occupations Within Selected Graphic Arts Companies In The United States, Howard Rose

Theses

The purpose of this investigation was to question the validity of community colleges' occupational goals for graphic arts programs in the United States. To accomplish this, a statistical investigation was designed to either accept or reject the hypothesis of the thesis, which was: If a community college's educational objective in a graphic arts program is to prepare the student for a specific occupational area and level of occupation in the graphic arts industry, then upon successful completion of the program, a personnel director of a graphic arts firm would hire the student for that area and level of occupation for …

Inherent Rhythms In Nature, Wendy Forrest

Theses

None provided.

Current Flexible Rotor-Bearing System Balancing Techniques Using Computer Simulation, John Kendig

Theses

As the cost of machinery has risen and the need for dependability, safety and increased performance have in a similar manner increased, the needs of industry for viable flexible rotor balancing techniques has no less increased. Various flexible rotor methods have been advocated for supercritical shafting, but few studies or comparisons have appeared in the open literature. Among the procedures for balancing large and/or high speed (supercritical) rotors are the "N" modal method of Bishop and Gladwell, the "N + B" modal of Federn, the "N" and " + B" simultaneous modal method of Kellenberger, and the influence coefficient method …

The Effects Of Density And Bleach Concentration On Efficiency And Resolution In Phase Holograms, Mark Gardiner, Dennis Moran

Theses

None provided.

Effects Of Varying Unsharp Masking And Contrasts In Duplicate Mammographs With Respect To Cancer Detection, Leonard Parker

Theses

This report examines two methods of enhancing a photographic image and applies them to duplicating mammographs. Subtractive unsharp masking, one such method, is a photo-optical edge enhancement technique. The degree of unsharpness is controlled by interspacing between the mammograph and a receiving film while exposing. The other method is optimizing the combination of masking film contrast and duplicating film contrast. Three levels of unsharpness, two levels of mask contrast and two levels of duplicating film contrast were tested. The common objective of this project and mammography in general involves the recognition and diagnosis of breast cancer. Specifically, the experimental objective …

Effect Of Mixing On Polymerizations In Batch Reactors, John Guy Steenrod

Theses

The effects of mixing on polymerizations in batch reactors are examined theoretically for initiations by thermal decomposition of catalyst and by absorption of ionizing radiation. Mathematical expressions for predicting the first three moments of the dead polymer size distribution are presented. Two extreme mixing states. perfect and no mixing. are considered. It is shown that in batch reactors mixing in any direction in which nonuniform initiations exist increases the polymerization reaction rate and the number average molecular weight, and decreases the weight average and the polydispersity.

Experimentally, the effects of mixing were studied in a solution polymerization system, in a …

A Study Of An Adiabatic Tubular Reactor For The Multiple Chlorination Of Methane, Richard L. Braun

Theses

A computer program has been developed which simulates the multiple chlorination of methane in an adiabatic, tubular reactor. Euler's method is used to approximate the solutions of the programs differential equations.

The program is designed to determine the amount of an inert diluent required in the feed stream to attain some specified conversion of methane in a safe and efficient temperature range. Particular emphasis is put on determining the amount of diluent required to attain 98% conversion of methane at an outlet temperature of 723°K. The program also determines the reactor volume necessary to achieve the specified conversion, and the …

The Steady State Heat And Temperature Distribution Of A Hot Sphere Within An Infinite Wedge, David W. Horwat

Theses

This thesis presents a mathematical model of the steady state heat and temperature distributions of a hot sphere located along the midplane of an infinitely long wedge of any arbitrary central angle. The heat and temperature distributions of this geometric configuration are of immense value, since through the use of this model as a wedge shaped unit cell the description of any number of hot spheres, arranged in a regular planar array can be immediately determined.

The method of reflections is used to solve Laplace's equation , V²T=O , analytically using the sphere and the wedge walls as …

Optimal Performance Of Equilibrium Parametric Pumps, Joseph A. Manganaro

Theses

An examination of the conditions required to obtain the optimal performance of semicontinuous and continuous parametric pumps, defined by the achieving of the maximum possible solute free product for a given column height, was undertaken. The model system sodium nitrate ? water on an ion retardation resin adsorbate was employed. Equations defining maximum values of certain important parameters such as the bottom product flow rate and reservoir displacement rate were developed by extending previous theories of parametric pumping. Experimental runs were carried out using parameters whose values were both less than and greater than the maximum values predicted for optimal …

Rheo-Optical Properties Of Polyisobutylene, Russell B. Biss

Theses

This study presents quantitative experimental data on the various stress-optical characteristics of polymer liquids, specifically, polyisobutylene. Through the use of a concentric cylinder rheogoniometer and a rotational viscometer, the temperature effects of a newtonian polyisobutylene liquid. was studied and was found to have a stress-optical coefficient independent of shear stress and minor temperature changes. The experiments confirm that the birefringence is a known function of the extinction angle and the shear stress. Various polyisobutylene liquids were used in a simple flow device to observe the birefringence in the 1-3 plane and the 2-3 plane. The results indicate that the 1-3 …

Absorption Of Methoxyflurane By Conductive Rubber And Polyethylene Anesthetic Hose, Edward A. Kippel

Theses

This thesis presents the results of an investigation into the absorption of methoxyflurane by conductive rubber and polyethylene anesthetic hose. Previous studies are reviewed and theoretical considerations governing the diffusion process are discussed.

Diffusion coefficients are calculated for commercially available hose materials using different anesthetic concentrations and oxygen flow rates.

Data obtained is compared with the results of previous investigations (primarily concerned with sorption into rubber hose) and similar results are presented for polyethylene hose.

Graphical data is used to demonstrate the effect of hose material on inspired anesthetic concentration.

The advantage of disposable conductive polyethylene hose over reusable rubber …

An Experimental Study Of The Separation Of Multicomponent Mixtures Via Thermal Parametric Pumping, Wayne Weywen Lin

Theses

A thermal continuous parametric pump for separating multi-component mixtures was experimentally investigated using the model system toluene-aniline-n-heptane on silica gel adsorbent. A simple method for predicting separations is presented and is found to be in good agreement with the experimental results. The method, based on an equilibrium theory, is under the assumption that a multicomponent mixture contains a series of pseudo-binary systems, each system consisting of one of the solutes as one component and the common inert solvent as the other component.

Densities Of Polar And Non-Polar Compounds And Their Mixtures, Peter Norman Notwick

Theses

Two principal studies were conducted as part of this thesis: evaluation of existing correlations for predicting densities of polar and non-polar liquids and their mixtures and experimentally measuring the densities of certain liquid systems.

Utilizing a modification of the simple picnometer experimental method, data were obtained for both pure compounds and liquid mixtures. Comparison of the pure compound data with available literature sources established the reliability of the technique.

The results of the correlation comparison indicate that the Riedel equation, is the most generally reliable for predicting the densities of pure "normal" compounds. Lydersen, et al., prepared tables for the …

An Evaluation Of The Applicability Of A.N.S.I. Standard Ph-2.9 To Contemporary Medical X-Ray Films Designated For Automated Processing, David Binko

Theses

Three medium speed screen-type medical x-ray films were exposed and manually processed in accordance with the procedures outlined in A.N.S.I. Standard PH-2.9, "Sensitometry of Medical X-Ray Films". Subsequent to processing, all samples were evaluated upon the response variables of base plus fog density, maximum density, A.N.S.I. speed, and A.N.S.I. contrast. A second set of film samples, exposed identically to the manually processed samples, were processed in a ninety-second cycle automated system. After sensitometric evaluation of the automated samples, a statistical comparison of the results obtained by both processing procedures was executed. In the second phase of the investigation, a factorial …

Master's Thesis, Susan Childs

Theses

None provided.

Two Studies In Animation, Irene Feingold

Theses

None provided.

An Experimental Study Of Parametric Pump, Khalid Omar Ranginwala

Theses

In this research for Master's Project, the possibility for separation of glucose and fructose by parametric pumping was investigated. In this research activated carbon was used as adsorbent. First Langmuir's isotherms for glucose and fructose were experimentally found. These results were utilized in the thermal parametric pumping. The pump was run semicontinuously. Parametric pumping was also carried out with KCl +H₂O solution using a resin as adsorbent, and the 'b' value of KCl was found.

Design Seminar, Clifford Bull

Theses

None provided.

Analog Control Of Sampled-Data Systems, Harry Trietley

Theses

The use of conventional analog controllers to produce a one- quarter -decay transient response in sampled output control systems is studied. In particular, the control of processes which can be adequately represented by a first order lag plus deadtime is analyzed, where the process deadtime does not exceed the sampling interval. The process output is measured by a sample-and-hold device, which introduces additional deadtime equal to the sampling interval. This extends previous work, which considered only the plant delay. Proportional and proportional- integral (two-mode) controllers are studied. Controller settings yielding a one-quarter-decay transient response are calculated using z-transform theory. Plant …

An Experimental Study Of Equilibrium Parametric Pumps, John A. Park

Theses

Parametric pumping is a separation process characterized by periodic changes in axial displacement, coupled with synchronized changes in some variable affecting the position of the interphase equilibrium. Both continuous and semicontinuous pumps were investigated at various operating conditions using a model system of toluene-n-hep-tane on a silica gel adsorbent. It has been shown that when the penetration distance for the cold cycle is less than or equal to that for the hot cycle and the height of the column, the pump has the capacity of complete removal of solute from one product stream. A quantity which is important in determining …

A Study Of Fluid Flow Entering A Sharp-Edged Channel, Rocco Racano

Theses

Experimental investigations were carried out on an newtonian fluid In the two dimensional case through the regions of a sharp-edged entrance and exit. Qualitative and quantitative results were compared to a variation of a two dimensional case of converging flow in a capillary as originally derived by Oka and proposed by Philippoff. In addition velocity profiles were taken in the entrance region. Furthermore, the effect of temperature gradients in the slit region with their resulting optical effects were considered. The methods used to obtain these goals were photoelasticity and streak photography.

Results were four, to be consistent with the theory …

A Near Time Optimal Adaptive Control Algorithm For Second Order Systems, Carlton Warren

Theses

During the past few years, many non-linear and/or adaptive control algorithms have been developed for industrial processes. Many have been rather complex schemes either requiring or specifically developed for an on line digital computer. As an alternative to such systems, at least on low order plants, the development of a near time optimal, adaptive control algorithm is proposed. This rule must encompass a significantly large group of the systems to be encountered and yet be simple enough for hardware implementation as a single loop controller. The author's attention is confined primarily to systems whose transfer functions may be approximated by …

The Hydrogen Ion - Bromide Ion Interaction In Photographic Developers, Steven Brainerd

Theses

An investigation has been made on the interaction effect of the hydrogen ion (pH level) and the bromide* ion on the development response variables. A pH range of 8.8 to 11.2 and bromide ion concentration levels of 0.125 to 8.0 grams per liter were used. The hydrogen ion-bromide ion interaction as tested on Kodak film type Fine Grain Release Positive 5302 had a significant effect on the rate of development, gamma, and photographic film speed in buffered metol-hvdroquinone, phenidone-hydroquinone, and hydroquinone sulfite developers. The trend for all developers was a decrease in the effect caused by the bromide ion with …

Development And Applications Of A Quadratic Isoparametric Finite Element For Axisymmetric Stress And Deflection Analysis, F. X. Janucik

Theses

The theory and computer program for an axisymmetric finite element for static stress and deflection analysis is presented. The element is an eight noded isoparametric quadrilateral based on the displacement method which is capable of representing quadratic variation of element boundaries and displacements. Element stiffness properties are developed for linear elastic small displacement theory using homogeneous isotropic material. Test cases are compared with theoretical solutions from the theory of elasticity to identify program capabilities and limitations. Ability to analyse axisymmetric problems and to represent curved element boundaries has been demonstrated. Example problems including a cylindrical pressure vessel, a disk of …

Design Of A Water Table Analog To Study The Dynamic Forces On Turbine Blades, Nicholas Yobbagy

Theses

This thesis describes the design of a water table analog to simulate and study the parameters associated with non-steady forces on turbine blades. The reasoning used to develop the water table method of analysis is presented, as well as the complete design details. The table has now been constructed to the extent where preliminary data has been generated to substantiate the design given herein.