Digital Commons Network^™

What Every Designer Should Know About Visual Semiotics: A Videotape Presentation, Anne Elizabeth Battle

Theses

Not Included

An Investigation Of The Effects Of Fabric And Stencil On Resolution And Registration In The Screen Printed Circuit Board, Jeffrey Paul Sauser

Theses

Printed circuit boards are a major component of most modern electronic devices. There are currently two major processes by which circuit boards are imaged; dry film and screen printing. This study investigated the screen printed circuit board. The resolution and registration limits are primary concerns of the screen circuit printer. These two factors are greatly influenced by two screen components; fabric and stencil system. The effects that two fabrics and two stencil systems had on the resolution and registration capabilities of a screen circuit printing system were determined. A test target was printed on a circuit substrate by a screen …

Electroplating And Electroforming As An Artists' Medium, R Lisa Toser

Theses

Not Included

The Computer And The Secondary School English Curriculum, Marjorie Schmieder

Theses

Not provided.

A Comparative Study Of Concurrency Control Algorithms For Distributed Databases, Fabio Aparicio

Theses

The declining cost of computer hardware and the increasing data processing needs of geographically dispersed organizations have led to substantial interest in distributed data management. These characteristics have led to reconsider the design of centralized databases. Distributed databases have appeared as a result of those considerations. A number of advantages result from having duplicate copies of data in a distributed databases. Some of these advantages are: increased data accesibility, more responsive data access, higher reliability, and load sharing. These and other benefits must be balanced against the additional cost and complexity introduced in doing so. This thesis considers the problem …

Parsing Natural Language, Leonard E. Wilcox

Theses

People have long been intrigued by the possibility of using a computer to "understand" natural language. Most researchers attempting to solve this problem have begun their efforts by trying to have the computer recognize the underlying syntactic form (the parse tree) of the sentence. This thesis presents an overview of the history of syntactic parsing of natural language, and it compares the major methods that have been used. Linguistically, two recent grammars are described: transformational grammar and systemic grammar. Computationally, three parsing strategies are described and compared: top-down parsing, bottom-up parsing, and a combination of both of these methods. Several …

A Resource System Package For Reservation Systems, Gary Foley

Theses

The Resource System Package is a software tool developed to aid in the design and use of reservation system databases. The package is designed to automate the creation of a reservation database for arbitrary objects and to facilitate ease of maintenance and updating of existing databases. Databases set up via the resource system are maintained through the Mistress Relational Database System, although no specific knowledge of Mistress is required of either the database designer or the users of the database. The package is menu-driven for ease of use. This package consists of two separate programs, a Resource System program and …

The Design And Construction Of A Hand Lithography Press, Inexpensive To Make And Easily Transportable, Susan Raab

Theses

Not Included

The Effects Of Selected Value Clarifying/Analyzing Strategies On The Self Concept And Critical Reading/Thinking Skills Of Low Achieving Ninth Grade Students, Janet Hoester Wies

Theses

The purpose of the study was to investigate the effects of selected value clarifying/analyzing strategies on the self concept and critical reading/thinking ability of low achieving ninth grade students. The clarifying strategies are designed around seven subprocesses of a value clarifying process developed primarily by Dr. Louis E. Raths to assist students in acquiring skill in choosing, prizing, and acting on value related issues. The analyzing strategies are designed around six subprocesses of a value analyzing process developed by Jerrold R. Coombs and Milton Meux to assist students in acquiring skills in evaluative decision making.

The major research hypotheses are: …

Means Of Lowering The Contrast Of Association Product Printing Plates, Ming-Hwa Wang

Theses

The Association Product is a photosensitive coating for continuous-tone litho plates (It can also be used as a plate coating for halftone printing). It consists of phenolic resin and poly(ethylene oxide) and is photosensitized by a water soluble sensitizer. Continuous-tone lithography has better quality potential than the halftone process. Because the halftone process converts the continuous-tone image of the original into small dots of varying sizes, it thus inherently degrades the image quality and adds time and material costs in screening. The water soluble sensitizer converts the hydrophilic Association Product to an oleophilic state in direct proportion to exposing energy, …

The Graphic Arts Industry In Mexico - Training And Educational Aspects, Orbe Garcia

Theses

THE GRAPHIC ARTS INDUSTRY IN MEXICO - TRAINING AND EDUCATIONAL ASPECTS Purpose of the Study: The general purpose of the study was to identify the training/educational needs existing in the graphic arts industry in Mexico and to make an assessment of the present situation and how those needs are being met. Specific purposes were to determine how the existing training/educating plans and programs are dealing with the influx of new technology being imported; to examine the type of new technology being purchased, by which sectors and the reasons for capital and equipment expenditures by these sectors; to analyse what problems …

The Effects Of Mechanical Stress On Photographic Emulsions, Dennis A. Weiss

Theses

The effects of mechanical stress on a photographic emulsion, namely Kodak Royal-X Panchromatic, has been investigated. The effects are related to the phenomenon of "Kink Desensitization" of the photographic emulsion. Despite the numerous experiments, results and explanations by previous authors on this phenomenon, a model relating the effects of mechanical stress on emulsions and dislocation theory of strained crystals still evades the photographic scientist. Strips of emulsion were axially stressed, using a Dillon tensiometer modified for compression. To analyze the changes in photo graphic sensitivity of the emulsion, the characteristic curves of the developed internal and external images were compared …

An Active Filter Design Program (Theory And Application), Louis Gabello

Theses

This thesis deals with the design of filters in the frequency domain. The intention of the thesis is to present an overview of the concepts of filter design along with two significant developments: a comprehensive filter design computer program and the theoretical development of an Nth order elliptic filter design procedure. The overview is presented in a fashion which accents the filter design process. The topics discussed include defining the attenuation requirements, normalization, determining the poles and zeros, denormalization and implementation. For each of these topics the text ad dresses the fundamental filter types (low pass through band stop). Within …

Design, Tuning And Performance Evaluation Of An Automated Pulmonary Nodule Detection System, William Lampeter

Theses

Radiologists miss about 25-30% of all pulmonary nodules smaller than 1.0 cm. in mass screenings. A system for the automated detection of the pulmonary nodule based on that of Hallard has been designed, tuned, and tested on a 43 chest radiographs [Ballard, 1973). The goal of this system is to aid the radiologist in locating a pulmonary nodule by indicating a few sites in the radiograph that are most likely to be nodules. Computer image analysis programs that respond to specific types of anatomic features have been devised and are incorporated in a pattern recognizer, which uses linear discriminant analysis …

Optical Sculptures, Alexander Syndikas

Theses

None provided.

Development Of A Software Package To Generate Screen Maintenance Programs For Use On Qantel Computers, Jane Keller

Theses

None provided.

Analysis Of Ink Film Thickness On Screenless Lithographic Plates By Microscopy, James Spruill Summers

Theses

Printing without the use of a halftone screen pattern offers many advantages, although most processes utilized are impractical for long run commercial printing. Screenless lithography provides a practical means of making unscreened reproductions. While screenless lithography has been in use for many years, its working mechanisms have only recently been explained. Past studies have investigated many of the factors which contribute to the continuous tone effect of screenless printing, but none have scientifically determined if ink film thickness variation is a contributing factor. Positive working lithographic plates were exposed to control scales, processed, inked, and allowed to dry. These plates …

Transportation Alternatives For Peak Period Passenger Travel In Greater Georgetown, Ahamad Baksh

Theses

Alternatives to present a workable and cost effective solution(s) to the inadequate supply of public transportation during the peak hour periods in Greater Georgetown (Guyana) are examined. Various transportation system management strategies that could help in either to service the peak period demands by more effective utilization of available transport resources or to manage these demands by altering peaks patterns, are discussed. Data from the transportation study aspect of the "Physical Plan for Greater Georgetown", conducted by the Central Housing and Planning Authority as well as data from the files of the Central Transport Planning Unit of the Ministry of …

Evaluation Of The Image Quality Of An Experimental Lenticular Film System For Radiographic Applications, Elizabeth A. Butler

Theses

A lenticular film system designed to suppress image degrading crossover during dual screen radiographic exposure is proposed and evaluated. The lenticular screen consists of two sheets of crossed cylindrical lenslets each with a frequency of 25 lenslets/mm. A numerical analysis via optical ray tracing compares the theoretical frequency response of the proposed system to that of a conventional radiographic film. It shows an enhancement in the response by a factor of two, for frequencies 1-4 c/mm. Experimental measurements made on simulations of the proposed system using Kodak film type, SO-241 confirm the predicted improvement in the mid-frequency range. The proposed …

Direct Diffusion Resist For Gravure, Wilson Hurst

Theses

One of the most attractive attributes of the gravure process is its ability to print a variable ink film by virtue of cell depth variation. This cell depth variation is achieved through the use of a diffusion resist. All diffusion resists are negative-working and, after exposure, require transfer to plate or cylinder. A "negative-working" resist is one where the emulsion becomes insoluble to the developing solution in those areas struck by actinic radiation. Presently available resists, which are directly applied to plate or cylinder prior to exposure, are not capable of controlling cell depth variation. Thus, the tone range obtainable …

Paper Coating Constituents And Their Influence On Chemical Ghosting, Craig Harmsen

Theses

For many years the printing industry, specifically sheetfed offset and letterpress printers, have been dealing with the problem of chemical ghosting. Traditionally it has been, a problem associated with drying oil inks. More recent research concludes that ghosting is also affected by the permeability of an adjacent substrate. This thesis examines paper coating constituents, their degree of concentration, and what influence they play- with regards to ghosting. A quickset drying oil ink has been found which when subjected to the proper laboratory conditions will display a high degree of colored ghosting. The thesis indicates the method of creating ghosting and …

Alphabet Soup, Beth April Smolev

Theses

None provided.

The Value Of Antiquities: Historical Development And Evaluation Of Trends In The Current Market Through Graphic Analysis And Sales Data Compilation, Mary Thornton Holton

Theses

The purpose of this project will be to examine some of the most central issues in the evaluation and methodology for valuing the category of fine arts known as antiquities. This category covers several historical periods and includes artifacts which originate anywhere in the present countries of Egypt, Greece, or Italy from 4000 BC in the pre-dynastic ages of Egypt through the various dynasties of the Pharaohs, through the Minoan, Mycenaean, Archaic, Classical, and Hellenistic ages of Greece, and through the times when the Roman Empire rose and dominated practically the entire known world. The final date which defines antiquities …

The Value Of Antiquities: Historical Development And Evaluation Of Trends In The Current Market Through Graphic Analysis And Sales Data Compilation, Mary Thornton Holmes

Theses

Unavailable.

Investigation Of The Electronic And Thermal Rearrangement Properties Of Spiro[2,4]Hepta-4,6-Dienes, Raymond K. Crandall

Theses

The mechanism of thermally induced hydrogen and alkyl migrations in suitably substituted cyclopentadienes have been extensively studied. Although the course and mechanism of alkyl shifts in cyclopentadienes have been investigated, there is currently a lack of agreement on the precise mechanisms of alkyl migrations. It is apparent that the mechanism is largely dependent on the nature of both the migrating substituent and upon other substituents in the molecule and, in some cases, the shift may occur by more than one competing mechanism. Alkyl shifts in spiro substituted cyclopentadienes have been clearly shown to proceed via a conceited pathway. However, the …

An Investigation Of The Effect Of An Infrared Post-Exposure Latent Image In A 3m Dry Silver Film, Thomas J. Cardinali

Theses

An investigation to determine the effect of an infrared post-exposure on the latent image in blue sensitive 3M Dry Silver film 7842 was performed. The film was first given a step tablet exposure using the unfiltered output of a tungsten source at 2856 K. A Wratten #87C filter was used with the same source to provide the second, infrared exposure over one half of the first exposure area. Absolute exposure and exposure reciprocity were tested. Processing was by immersion into a bath of 3M fluorocarbon FC-43 maintained at 127C/260F. The original objective, to cause Herschel effect bleaching of latent image, …

Polymerization Of Disubstituted Conjugated Dienes: Synthesis Of 1, 3-Diphenyl-1, 3-Butadiene, David Allen

Theses

1, 3-Diphehyl-l, 3-butadiene 3 has been found to rapidly undergo the Diels-Alder reaction at room temperature to yield 1, 3, 4-triphenyl-4-styrylcyclohexene 10. The dimer was characterized by elemental analysis, infrared and nuclear magnetic resonance spectrosopy. The isomeric diphenylbutadienes were of interest as a model system to study the interaction of steric hindrance and electronic effects in the homopolymerization of disubstituted butadienes. Several synthetic routes to an appropriate tosylate for base catalyzed elimination at low temperatures to avoid dimerization of the monomer were explored and found unsuccessful for various reasons. The monomer was trapped as an iron tricarbonyl complex. This complex …

Informational Needs Within A Decision Making Model For Curriculum Development, Sandra J. Rowell

Theses

This thesis analyzes informational needs within a decision-making model for curriculum development, focusing on the Francis Howell School District's shift from decentralized to centralized curriculum in the 1970s. The study uses Lipham's decision-making model, which involves recognizing a problem, gathering information, considering alternatives, making a choice, and evaluating the outcome.

The author, a member of the planning committee, provided information and suggestions for the study, including criteria for curriculum guides, sample guides from other districts, and a review of goals and objectives. The thesis also explores different value bases and curriculum theories, emphasizing the importance of understanding these values in …

Dyad: Biography Of A Relationship, John Fergus-Jean

Theses

None provided.

The Atmospheric Photochemical Stability Of Cc1f2no, Cc12fno, Cc1fno2, And Cc12fno2, George Fazekas

Theses

CC1F2N0, CC1F2N0, CC1F2N02 and CC12FN02 were prepared and purified in the laboratory. Three methods for the preparation of chlorodifluoronitrosomethane were evaluated: 1) decarboxylation of the sodium salt of chlorodifluoroacetic acid in the presence of nitrosyl chloride, 2) nitrosation of chlorodifluoromethanesulfenylchoride and 3) photolysis of bromodichlorofluoromethane in the presence of nitric oxide. The vapor phase decarboxylation of the sodium salt of chlorodifluoroacetic acid in the presence of nitrosyl chloride gave chlorodifluoronitrosomethane with the highest yield and purity. Because the sodium salt of dichlofluoroacetic acid was not available to utilize in a similar manner, dichlorofluoronitrosomethane was prepared from the reaction of dichlorofluoromethanesulfenylchloride …