Digital Commons Network^™

The Application And Analysis Of An Antireflection Coating On A Multilayer Resist System To Generate A 1.0 Μm Aluminum Line Over 0.5 Μm Sio2 Step, Chung-Ta Wu

Theses

An antireflection coating (ARC) containing polyvinyl alcohol and two dyes was applied to a substrate to form a new multilayer resist system.

Based on the results of the application of the ARC on a planar aluminum substrate, an increase of the latitude of exposure and an improvement of the resist image quality were found.

The ARC had a specific concentration of dyes and a specific thickness. The image was a 1.0 µm line and space pattern. By using the ARC, even though the resist thickness varied from 1.2 µm to 1.5 µm, the resulting 1.0 µm image remained within a …

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 …

Digitization, Testing, And Evaluation Of A Device For Rapid Determination Of Rms Granularity, Daniel J. Williams

Theses

A rotary stage microdensitometer was interfaced to an Apple II personal computer for the purpose of making rapid rms granularity measurements. An experimentally determined relationship was found between standard deviation in voltage and rms granularity. By using this relationship the device proved accurate to within 7 percent of the known values of rms granularity on a conventional microdensitometer for the same samples with 95 percent confidence.

Proposal And Investigation Of A Method For Measuring Process Color Variation Via Reflection Densitometer, Russell Harris

Theses

This thesis proposes a method of using reflection density readings taken with a conventional graphic arts densitometer to provide a numeric measure of the visual difference between a sample press sheet and a reference sheet. This numerical measure was developed based on the theory that human response to variation in process color printing is more affected by changes in the proportions of process inks to each other than by variation in the overall inking level of the press sheet. The thesis then goes on to explain how the proposed system was tested. First, a set of color samples was generated. …

Pattern Generation And Fault Detection In Digital Circuits Using A Microprocessor, Syed Riffat Ali

Theses

The main object of this Professional Project was to establish a microcomputer based system which could detect faults in digital circuits. Hardware and software for the Motorola 6800 microcomputer system was fully developed. Node level diagnostic programs were then used to pump known "Bit Patterns" into digital circuits and responses recorded via Pseudorandom binary sequence generator using CRC code. This method also known as "Signature Analysis" was then applied to detect faults successfully in Universal Asynchronous Receiver Transmitter or UART Circuits.

Leachate Treatment Technique Utilizing Fly Ash As A Low Cost Sorbent, Turan A. Ramadan

Theses

This study was carried out to design a system for the inexpensive treatment of ash pond effluent or leachate. Twelve different coals were burned in three different types of coal fired boilers to determine the influence of coal composition, ash fusion temperatures, boiler additives, combustion conditions and co-firing of natural gas or oil with the coal, on the composition of the fly ash and bottom ash as well as the leaching and sorbate characteristics of the fly ash produced.

The trace elemental analysis consisting of Ti, Cd, Sn, Ni, Pb, Mo, Cu, Cr. Zn, Mn, Ba, and V in the …

Investigation Of Mental Workload In A Visual Inspection Task, Michel Alfandari

Theses

This thesis consists of an investigation of the "mental workload" involved in a visual inspection task. A short-term laboratory experiment was conducted on twenty test subjects to study the effects of three typical job-related factors encountered in mental workload situations: load stress, time stress, and motivation. These effects were assessed through the subjects' performances as measured by speed and accuracy data. The analysis of the results revealed that an increase in load stress deteriorates both speed and accuracy, whereas time stress improves speed but only at the expense of accuracy. The expected positive influence of motivational factor (cash prizes) was …

Study Of Compositional Changes (Altered Layer) In (Hg,Cd)Te Targets Sputtered With Hg Vapor, Robert Granville Bourne

Theses

Six mercury cadmium telluride targets (5.74 cm diameter) with six polycrystalline (Hg_0.8 Cd_0.2 )Te ingots (1 x 3 x 0.7 cm ± 20%) epoxied on them, were r.f. sputtered in an MRC-8800 triode system for 1, 2, 3, and 5 minutes. The six sputtering runs were made with 3 different Hg pressures of 1.0, 1.25, and 1.6μm while the uniform target power density was kept constant at 7.7W/cm². After sputtering a target, Br₂ +CH₃OH was used to chemically etch the sputtered ingots to different depths. The surface composition of the etched ingots was …

Prediction Of Heats Of Mixing By Group Contribution Methods, William Walter Rupp

Theses

Three group contribution methods used to predict heats of mixing were tested: AGSM, UNIFAC with temperature dependent parameters and the modified UNIFAC of Skjold-Jor-gensen et al. The modified UNIFAC provided the best results and was adopted in this study. Primary parameters were obtained for ten groups with alkanes. The simultaneous correlation of cyclic and straight-chain alkanes gave poor results. Attempts to improve the error by changing the group area parameter for cyclic CH₂ failed.

A major problem in correlating the experimental data was the multiplicity of roots. The best set of parameters was obtained by using a grid approach …

Thermal Rearrangement Studies Of Deuterium Labeled Dibenzo [A,E] Cyclooctatetraenes, Charles W. Wenger

Theses

In an attempt to further substantiate the findings of Stiles and Salisbury on the rearrangement of aryl disubstiuted dibenzo [a, e] cyclooctatetraenes a new pair of derivatives were synthesized. The 5,6 and 5,11 dideuteriodibenzo-[a,e] cyclcoctetetraenes were prepared. The 5,6 derivative was prepared starting with dibenzo [a,e] cyclooctene-5,6-dione. The 5,11 derivative was prepared starting with o-tolualdehyde. In the case of the 5,6 derivative the deuterium was introduced by a LiAlD₄ reduction of the dibenzo [a,e]-cyclooctene-5,6-dione. The 5,11 derivative had been labeled with deuterium in the final step during the Wittig reaction. The use of methanol-d₁ as the solvent in …

Prediction Of Vapor-Liquid Equilibrium From Ternary Liquid-Liquid Equilibrium Data, David Kim Yee

Theses

Reasonable estimates of ternary vapor-liquid equilibrium can be obtained by using the corresponding liquid-liquid equilibrium (LLE) data with the NRTL, LEMF and UNIQUAC models. The overall average absolute deviation in vapor phase concentration for seven such systems is 0.028.: Use of the UNIFAC method gives erratic predictions suggesting caution when applied to such systems. Combination, however, of the LLE data and the UNIFAC method gives the best results with a deviation of 0.020 Prediction of binary VLE behavior from LLE data yields also reasonably good results.

Aurora Borealis, Carol Luzon

Theses

None provided.

Prediction Of Cut-Off Frequency From The Maximum Slope Of A Transmittance Scan Of An Ideal Edge, Dale E. Ewbank

Theses

This study has empirically shown that the maximum slope of an ideal edge scan in transmittance versus position is an excellent indicator of the cut-off frequency at which a microdensitometer system's modulation transfer function goes to zero. It was found that numerical aperture of collection objective, scanning slit width and alignment, system focus, and sampling interval are parameters which must be carefully chosen and set-up when implementing or using this slope technique to check system performance.

The Effect Of Ink/Fountain Solution Emulsion Of Paper Permanence, Thomas H. Spotts

Theses

The permanence of printed documents and books appears to be primarily dependent on paper stability. Other researchers implicate pH as a major factor in the deterioration rate of paper and acidity as major the cause of this deterioration. During the lithographic printing process, ink is in direct contact with fountain solution, which can be acidic or alkaline. Fountain solution is a mixture of water and chemicals used to keep the non-image areas of a lithographic plate moist. On press the intimate contact of ink with fountain solution creates a fountain solution-in-ink emulsion. The emulsion used here is a stable suspension …

The Ability Of Surfactants To Assist In The Removal Of Image Scum In Positive Resist Development, Michael P. Belden

Theses

An experiment was run to determine the ability of surfactants to reduce or remove scum produced during development of a positive resist. Anionic, cationic and nonionic surfactants were added to a low metal ion developer at concentrations between 0.025% and 0.57o. The film thickness loss due to development was measured, and image profiles were observed with scanning electron micrographs . Of the surfactants tried, Aerasol OT-75 (dioctyl ester of sodium sulfosuccinic acid) produced the best results, 9.57o film thickness loss with little image profile change. However, the experiment was limited by processing condition variables.

An Investigation And Implementation Of Recommendation X.25 On A Motorola M6800 Based Network, Louis Nyerges

Theses

A subset of the Recommendation X.25 protocol is implemented on a two node network. Each node accepts and translates data from the user in a sequential fashion into the appropriate protocol structure for transmission to another node. Each node has the capability of full duplex operation. The hardware is built around a Motorola M6800 microprocessor employing a minimum of 4096 words of random access memory and two asynchronous ports: one for communication with the user and the other for communication with the network. The software on each node contains the protocol programs and a multitasking monitor which is used to …

Factors Influencing Flexographic Tone Reproduction Including Types Of Printing Plate Materials Used, Bruce Capriotti

Theses

During the past three years, a number of photopolymer plates for flexographic printing have appeared on the market. The use of such a plate greatly simplifies flexographic platemaking by reducing the process to a level similar to that of a presensitized plate for offset lithography. A series of experiments were conducted to determine whether or not there were significant differences in the areas of half tone dots in different areas of the tonal scale on different types of flexographic plate materials all made from a single negative with a specially designed test object on it. Assuming significant differences were found …

Secret Gardens, Mark A. Fisher

Theses

Unavailable.

Optimization Of Positive Resist/Developer Pairs For Semiconductor Fabrication, John G. Maltabes

Theses

A study was conducted in which a series ofexperiments were performed using three positive photoresists and three developers in crossed experimentation, simulating semiconductor fabrication steps. Tests conducted, examined coating uniformity, unexposed resist loss, photosensitivity, undercut, and resist flow. Although there was not a clear-cut optimum resist/developer pair, some worked better than others.

A Comparison Of The Perception Of Juxtaposed Tones In Newspaper Images When Screened With Conventional And Random Dot Screens, Sylvia Monteiro

Theses

The halftone process has been the conventional means of reproducing photographic artwork on newsprint. The use of relatively coarse screen rulings, dictated by the paper characteristics, produces an image with a noticeable dot pattern. Furthermore, the printing process is susceptible to extreme dot gain variation, which affects tone reproduction and the pictorial communication of the image. There were good reasons to suspect that a random dot screen could give more consistent tone rendition than a conventional halftone screen. A comparative study of the consistency of perception of conventional and randomly screened images when printed on newsprint has not yet been …

Densitometrically Measured Effective Dot Area As A Function Of Ink Hue, Jeffrey Latzko

Theses

Percentage dot gain on coated and uncoated papers has been determined to be different depending on the ink hue used for 150 line screens. Cyan, magenta, yellow, and black inks all showed different amounts of dot gain from the printing plate to the paper- Effective dot area on the paper versus dot area on the printing plate data are presented.

The Stability Of Reciprocity Law Failure In Color Print Papers, Victoria L. Carriero

Theses

A study of reciprocity law failure in Kodak Ektacolor 74 and 78 color print papers was carried out by a series of equal engery exposures. Using a color separating filter pack to differentiate the response of RLF of the individual emulsion layers an acceptable color print is attainable by using these curves to determine exposure and filtration changes.

Microprocessor-Based In-Process Infrared Densitometer, Steven Cox

Theses

By the use of high performance solid-state infrared emitting diodes, matched infrared detectors, and a single chip 8-bit microprocessor, an in-process infrared densitometer has been designed and constructed. The device is capable of recording the build-up of optical transmission density on an exposed film sample as it develops, with no effect on the normal development process. The most novel feature of this system is a special development chamber with eleven built-in infrared densitometers. These densitometers are located as to read every other step of a standard Kodak #2 step-tablet exposure, and to allow the passage of developer across the film …

A Family Document, Ronald Richardson

Theses

None provided.

Richard Requa: Southern California Architect, 1881-1941, Mary Taschner

Theses

This thesis details the life of Richard Requa, Southern California architect.

An Investigation Into The Effects Of Dry Etching Techniques On Changing Halftone Dot-Sizes, Anthony P. Stanton

Theses

The purpose of this research was to investigate the effects of dry etching techniques on changing halftone dotsizes. Dry etching, or photographic color correction, has emerged in recent years as an alternative to traditional dot etching for making local corrections to color separation halftones. This study examines six factors related to dry etching. First, three types of original halftone dots were considered: laser formed (hard) dots from a Hell DC-300B scanner, laser formed (semi-hard) dots from a P.D.I, scanner, and contact screen (soft) dots from a Crosfield 510 Magnascan scanner. Second, the original dot-sizes being treated were fixed as close …

Sensitization Of An Oxadiazole Derivative As An Organic Photoconductor, Claude G. Ceintrey

Theses

The sensitization and the spectral sensitization of the photoconductivity of an organic derivative, 2,5-bis (p-diethyl-aminophenyl) - 1,3, 4-oxadiazole, was studied once an electrostatic sensitometer had been built. Among 27 dyes tested representing 8 different classes, only the triarylmethane-type dyes and rhodamine-type dyes have a sensitizing effect which does not seem to be correlated with energy level considerations. The main effect of the sensitizers, once they have formed charge-transfer complexes, is to increase the dark decay reaction, and, thus, they are not suitable as practical products.

Satellite Channel Sharing And Its Implications For Computer Networks, David Storch

Theses

Not provided.

The Acquisition Process For Major Defense Systems, Steven M. Freer

Theses

Unavailable.

Government Contracting And Technological Change, Isaac Sims Jr.

Theses

This culminating project by Captain Isaac Sims Jr., titled "Government Contracting and Technological Change," examines the evolution of U.S. government policies and practices concerning research and development (R&D) from the pre-World War II era through the immediate postwar years. The study highlights the significant transformation in the federal approach to technological innovation, particularly in defense and medical research, driven by the exigencies of wartime and the Cold War. Central to this transformation was the emergence of a robust contractual relationship between government agencies and private institutions, including universities and industrial firms.

The document outlines how World War II catalyzed the …