Digital Commons Network^™

A Study Of The Effects Of The Addition Of Halogen On The Redox Potentials Of Several Sensitizing Dyes, Stephen Noland

Theses

Basic data are lacking in the literature concerning the reactivities of desensitizing dyes to Iodine, and concerning their redox potentials while undergoing such reactions. Such information may be useful in deciding on the mechanism of desensitization, since there is good evidence that the halogen liberated from an Iodobromide emulsion during photolysis is actually Iodine. Therefore, experiments were undertaken to measure the polarographic anodic potential of the first addition product of a series of thiacyanine dyes, if such a species existed. Also, preliminary experiments were undertaken to determine the relative reactivities of the dyes to molecular Iodine and Bromine while they …

The Function Of Flat Shape In Painting, Marla Friedrich

Theses

None provided.

The Design And Development Of A Professional Super-8 Movie Camera, Donald Simonini

Theses

None provided.

Contemporary Religious Graphic Design, Vlasta Paul

Theses

None provided.

Deflections Of A Ring Due To Normal Loads Using Energy Method And Stiffness Matrix Method, A.J. Rabinowitz

Theses

Deflections and reactions of a ring of 1.855" mean diameter, fixed at one point, simply supported at another point and loaded normally at an arbitrary point were determined using the energy method and the stiffness matrix method. These results were verified experimentally and it was found that the values of displacements and reactions obtained by the two theoretical methods were within 4.5% and 0.5% respectively of experimental results. When effect of transverse shear was included in the computations done using the energy method it increased the values of deflections by less than 1.5% thus confirming that the effect of transverse …

Interference Coatings, Bruno Glavich

Theses

Not provided.

Diffusion Of The Thiosulfate Ion Out Of Photographic Film During Washing, Kenneth Haring

Theses

The thiosulfate ion does not freely diffuse out of a hardened photographic gelatin emulsion. Salts in the washing water displaces the adsorbed thiosulfate ions and allows them to freely diffuse out of the emulsion. The effect of temperature upon the diffusion of the thiosulfate ion is on the order of other diffusion processes. The type and amount of hardening also affects the diffusion of thiosulfate. The diffusion of thiosulfate out of the emulsion is fastest when a non-hardening fixer is used. The use of an alum hardening fixer results in slower diffusion than with formaldehyde prehardening.

A Study Of Consumer Acceptance Of A No-Loss Credit Card Verification System, Dean Arlidge

Theses

This research study focuses upon Credit Cards and a proposed verification method to reduce the risk of fraudulent use. It is anticipated that the proliferation and growing use of credit cards will require the use of security concepts offering built-in point of use protection that is automatic and reliable. A suggested concept is the use of a combined electronic credit card and a memory device. The proposed verification technique combines a user electronic credit card and memory number along with a simple imprinter which would be operated by the person accepting the credit card. Credit cards have become a widely …

Wet Film Sensitometry With An Infrared Scanning Densitometer, Anthony Casinelli, John Hisler

Theses

This project was to design and operate an infrared scanning densitometer to monitor the growth of the characteristic curve of a film during development. An aparatus was constructed which enabled us to pass repeatedly, a sensitometric strip through a beam of radiation during development. This radiation was focused on the film plane of the development container. The spot on the film plane was relayed, after transmission through the sample, to a photomultiplier tube. The response of the tube was displayed an oscilloscope and this was photographed. We were able to obtain a trace of the characteristic curve of a fully …

An Experiment In The Use Of Graphics For Musical Interpretation, James Van De Car

Theses

Not provided.

The Stability Of A Nonlinear, Time-Varying Control System, Joseph Connolly

Theses

This thesis investigates the stability of a class of nonlinear, time-varying control systems using the Second Method of Liapunov. A recent investigation of this subject was done by Dr. Z. V. Rekasius when he presented the sufficient conditions for stability for a feedback system containing a single nonlinear, time-varying element whose input-output characteristic is contained in a finite sector. This stability criterion developed by Dr. Rekasius is used to extend the region of stability for a class of nonlinear, time-varying systems represented by the equations ẋ = A x + b f(σ,t) σ = cTx where x is an n-vector …

An Investigation Into The Development Process Of Medical X-Ray Films, Alfred Knapp, Johnny Hovis

Theses

Correlation between the results of medical x-ray processing labs and the USA Standard for processing medical x-ray film is lacking at present. In order to correct this, a developer formulation will have to be devised to obtain in the experimental laboratory the same results that are obtained by the automatic x-ray processing machines that are presently being used. In an attempt to accomplish this, a factorial experiment was designed in which two levels of the following five factors were varied: metol, hydroquinone, potassium bromide, development time, and film (both rapid process types). The results from this factorial (tray processing) would …

Experimental Study In Systems Optimization Of An Ansco Model 4 Microdensitometer, George Orton, Mitchell Stevens

Theses

A research project was designed to repair and optimize the performance of a. prototype Ansco Model 4 Microdensitometer which had been inoperative for several years. Repairs were made in the start circuit of the control panel, lamp voltage control and the 2nd cut-in potentiometer to make the instrument operative. Calibrations and alignments were made and an apparatus was designed and implemented to facilitate lateral slit alignment. The original objective of optimization was not met due to insufficient time but the instrument was made operative and accurate to less than 2% over the 0-3.0 density range and 15% above 3.0. Recommendations …

Fact And Illusion In Painting, Patricia Sennett

Theses

Not provided.

A Comparison Study Of Resolving Power Targets, Robert Mericsko, Kent Collier

Theses

Five high contrast (greater than 100:1) reflection test targets were investigated. The taregts were: (1) USAF 1951, (2) NBS Microcopy, (3) DIN German Standard, (4) RIT, and (5) a Hexagonal test target. The targets .were photo graphed at a reduction of 21X using a microcopying camera. Evaluation of resolving powers was made by the two research partners; independently. Analysis of the resultant data involved' a comparison of resolving power averages and variations for each target type. It was concluded that the five resolving power- targets do not perform similarly over the region investigated. Consistent variability could not be obtained between …

Detection Of Developer By-Products Using The Schlieren Method, Stephen Kelly, Ralph Simon

Theses

A single-pass schlieren system, utilizing two 14 inch focal length lenses, has been developed for the purpose of demonstrating the feasibility of detecting and recording developer by-product flows from various photographic film/paper-developer combinations. The test samples studied were: Kodak Polycontrast F Paper in Kodak Developer, D-72 and Kodak Kodalith Contact Film in Kodak Developers D-11, Kodalith Super and Kodalith. The apparent amount of detectable flow varied greatly from test sample to test sample, but did not seem to show any significant shift in the pattern due to variations in the exposure conditions on the samples. Differences in the time of …

A Study Of The Holy As An Aesthetic Phenomenon, Thomas Raterman

Theses

Not provided.

Stoneware And Porcelain Fireplaces, Rick E. Flannery

Theses

None provided.

Drawing And Painting On Pottery Forms, Roger Churches

Theses

Not Included

Certain Relationships Between Painters Of The Mannerist School And Selected Contemporary Painters, Phillip Duell

Theses

None provided.

Window Paintings, John Ritson

Theses

None provided.

Development Of A Series Of Geometric Shaped Canvas Paintings, William Johnston

Theses

None provided.

Thin Layer Ionophoresis Of Sugars, Joseph Gilbert Vrindten

Theses

In 1952, Consden and Stanier published a report on paper ionophoresis of sugars in which they showed experimentally an increase in mobility of sugars with increasing pH in borate buffers. The object of the experiments in this thesis was to determine if this finding was also true of thin layer plates, there being no published literature on similar experiments using thin layer ionophoresis.

Glass plates 20 cm. x 20 cm. were coated with a 300 micron layer of cellulose powder and dried at 105° C. for one hour. They were then stored in an airtight tin box until ready for …

"For A Better Zoo", Vincent Lupinetti

Theses

None provided.

Varying Contrast Of Ektacolor Paper By Rehalogenation Techniques, James Esser

Theses

By using rehalogenation techniques with Kodak Ektacolor paper, contrasts of nearly twice that produced by CP-5 processing were obtained. A metol-hydroquinone developer was used to produce a silver image which was rehaligenated and then developed in CP-5 developer to produce the colored image. By adding a restrainer to the MQ developer and then increasing development times, it was possible to produce a range of contrasts. Only slight changes in contrast were obtained by varying the MQ concentration. pH and development times at normal restrainer content. By reducing the color redevelopment time it was possible to reduce the contrast slightly.

New Concepts In Illustration Techniques For The Printed Media, David Folkman

Theses

None provided.

Serving Pieces And Local Clay Glazes, John Smolenski

Theses

None provided.

Streak Photography: An Exploratory Experiment For Future Display Techniques, Andrew Davidhazy

Theses

None provided.

The Reaction Products And The Kinetics Of The Reactions Between Hypochlorite Ions And Thiosulfate And Tetrathionate Ions, Thomas Dagon

Theses

The reaction products of the hypochlorite oxidation of both thiosulfate and tetrathionate solutions were determined. In addition, preliminary kinetic studies were made dealing with the alkaline chlorination of thiosulfate solutions and with the hypochlorination of tetrathionate solutions. In the latter case, a pH dependent induction period was observed.

An Active Fet Receiver Front End Mixer, Kenneth Voyce

Theses

In many recent receiver designs, the front-end mixer determines the receiver's sensitivity and its susceptibility to distortion from large input signals. Two balanced FET mixers are developed for such an application; a common source configuration and a common gate configuration. Each exhibits a range of 110 dB between the available input power necessary for 10 dB((S+N))/N sensitivity and the available input power of a two-tone signal which causes intermodulation products down 40 dB from the desired signals. An expression for the conversion transconductance of a junction FET used as a mixer is first derived from the device transfer characteristic equation. …