Digital Commons Network^™

Simulation Of An Open-Loop Stepping Motor System, Gregory Bell

Theses

This report presents a description and functional model of a hybrid stepping motor drive system. The motor drive methods of fullstepping and backstepping are presented as examples. Test methods for system characterization are described, and response characteristics for the simulated and experimental results are compared to verify the model. This paper shows that an open-loop stepping motor drive system can be accurately simulated to predict real hardware performance.

Structural Metamorphosis, Soo Hong Jahng

Theses

None provided.

Nexus: Painting As A Link To A Primary Reality, Karen Sardisco

Theses

None provided.

Attitudes And Evolution; A Profile Of My Work, Amy Ellen Anthony

Theses

None provided.

The Use Of Edge Gradient Analysis On Chrome And Emulsion Photomasks To Determine Modulation Transfer Functions, Marcy E. Levin

Theses

Using edge gradient analysis on chrome and emulsion photomasks to determine the modulation transfer function of a mask making system proved to be limited by the method in which the edge gradients were observed. Scanning electron micrographs were taken of the chrome and emulsion edges on various masks, and results showed that chrome photosmasks exhibit steeper gradients and better edge acuity than emulsion images. However, due to the ratio of line size to gradient size on each of the types of masks, it was decided that the gradient would not make a significant contribution to modulation loss in the image.

The Measurement Of Scatter And Absorption Using Three Spectrophotometric Techniques, Christopher Pearson

Theses

Three methods for scattering and absorption measurements were compared for correlation; Kubelka-Munk, 4pi and an in transmission compartment scattering measurement method. The results indicated highest correlation between the 4pi and Kubelka-Munk absorption measurements. The 4pi and Kubelka-Munk scattering measurements had the highest correlation for scattering, and almost no correlation was found between Kubelka-Munk and in transmission compartment scattering measurements.

The Effect Of Cross-Coupling On The Temporal Response Of Ultrasonic Transducer Arrays, David Hadley

Theses

An investigation was performed examining a possible cause of acoustic cross-coupling in ultrasonic transducer arrays. It was postulated that pulse velocity was decreased due to the physical presence of other ultrasonic pulses in the medium. It was demonstrated that average pulse velocity is independent of the number of opposing waves traveling through an acoustic medium. A description of variable pulse velocity is discussed.

Spectrophotometric Color Formulation Based On Two-Constant Kubelka-Munk Theory, Eric Walowit

Theses

A new approach to computer color formulation based on non-linear least-squares techniques has been developed to characterize colorants and predict their behavior in mixtures. This approach allows the optimization of absorption and scattering calculations to characterize these colorants. This same method has been used to directly match the spectral reflectance of a standard with a mixture of colorants that yields nearly the same spectral reflectance as the standard being matched. Several advantages have been gained over more traditional methods: Kubelka-Munk K and S has been determined without primary binary blends, the spectral reflectance of the standard and proposed formulation exhibit …

A Method For Comparison Of Anti-Reflection Coatings For Photoresist Via A Simple Computer Algorithm, Neil Levine

Theses

A method was achieved to allow a quantitative and rapid comparison of different anti-reflection coatings (ARC) used under the photoresist layer in semiconductor-device fabrication. The computer algorithm utilizes the spectral irradiance of the source, reflectance of the substrate, absorption of the photoresist and ARC, and the spectral sensitivity of the photoresist to provide a quantitative value of the total system response to reflectance. The algorithm was tested by correlating the resultant value with photoresist resolution on aluminum, polysilicon, and 2nd-oxide process layers, and found to be linear with an R-squared value of 0.99S5 within the region investigated. Subsequent statistical analysis …

A Survey On Censorship In Missouri Secondary Schools, Janie Hutchinson Walker

Theses

The purpose of this study was to determine by a general survey the extent of censorship in Missouri secondary schools. This survey was intended to obtain information regarding districts selection policies, policies pertaining to censorship procedures, actual incidence of censorship cases, titles found objectionable, and reasons for objections. It was also intended to elicit individual librarians' opinions regarding censorship cases in their school district and on contributing to a statewide newsletter on issues pertinent to censorship.

In this study, surveys were sent to a random sampling of 106 of the 546 school districts listed in the 1983-84 Missouri School Directory. …

A Curriculum For Mainstreaming The Gifted Third Grader In Reading Through Children's Literature, Suzanne Horn

Theses

Mainstreaming the gifted third- grader in reading should be accomplished through the implementation of a modified curriculum that meets the child's unique educational and specialized needs. This curriculum should be process and product oriented . Process modifications should include the use of higher levels of thinking, inductive reasoning, reasoning strategies, freedom of choice, and open-endedness . It should include appropriate changes of pacing and a variety of teaching models . The curriculum should result in a product that is based on instruction. This curriculum should be enriched with literature that exhibits fluent, flexible, original, and elaborative writing.

With these criteria …

In-Line Process Monitoring Of Spray Developed Diazoquinone Photoresist, Kenneth Sautter

Theses

As the minimum feature size of IC devices is reduced, the control of linewidth becomes moire and more critical. An in-line process monitor for spray developed diazoquinone-type photoresist has been constructed which enables a spin-developing module to automatically compensate for the numerous variables which can affect linewidths. The development time of a wafer is varied depending on the dissolution rate of the photoresist. Development is monitored by reflecting light from the wafer surface which is sensed by a photodiode. Variable development time has been shown to control linewidths as exposure dose and photoresist coating thickness were changed. The relationship between …

The Determination Of Paper Spread Functions And Their Fourier Transforms From Kubelka-Munk Absorption And Scattering Measurements, Brian Pridham

Theses

In the study of imaging on paper, the effect of the penetration of light into the paper is usually neglected. Measurements show that light does not emerge from the paper sample at the same spot where it entered. The manner in which the light spreads through the paper is described by the spread function of the paper. It was suspected that an estimation of the paper spread function and its Fourier transform could be made based on the Kubelka-Munk absorption (K) and scattering (S) coefficients of the paper using a general diffusion model. The results show that an estimate of …

The Artist In Society, Ann Demarle-Pollak

Theses

None provided.

A Question Of Reality, Bruce Chapin

Theses

None provided.

A Study To Eliminate Moire Patterns Produced In Color Separations When Scanning Polachrome Cs Transparency Film On The Hell Dc-300 B/L Laser Scanner, Edwin Parker Price

Theses

The Polaroid Corporation, in May of 1983, introduced Polachrome CS color transparency film and a new process called the Autoprocess system. This system offers the convenience of obtaining instant color transparencies in about three minutes. The film has excellent projection and viewing characteristics. The product was designed to have its largest market with professional photographers. Polachrome's construction creates problems for the printer in that moire patterns occur during the separation process. This study gives a short background for both additive color screen films and dye layer films, and a comparison is made to help the reader understand the problems with …

The Fabrication And Testing Of A Lead Iodide Photovoltaic Cell, Keith Greenberg

Theses

A new type of photovoltaic cell using lead iodide as the photosensitive element and aluminum and silver as electrodes was constructed and then tested for open circuit voltage, monochromatic quantum yield of short circuit current, and fill factor. A similar cell was also fabricated using the familiar merocyanine dye M-8 as the photosensitive element for use in a control experiment. Minimal open circuit voltages of not more than 26 mV were obtained for lead iodide while much larger photovoltaic parameters were obtained for M-8. The poor and impermanent performance of lead iodide relative to the organic control suggests that lead …

A Comparison Of The Biodegradation Of Phenol And O-Chlorophenol Using A Municipal Mixed Liquor And Three Commercial Microbial Preparations, Nigel P. Mcmullen

Theses

The biodegradation of phenol and O-chlorophenol was studied in six-liter batch reactors, using a municipal mixed liquor (from the Livingston, NJ treatment plant) that had not previously been exposed to either of the substrates. In addition, three commercial microbial preparations: BI-CHEM (Sybron), Hydrobac (Polybac), and LLMO (General Environmental Science), were tested alone and in combination with the municipal mixed liquor.

It was found that the municipal mixed liquor performed significantly better than any of the commercial preparations by themselves. When the commercial preparations were mixed with the municipal mixed liquor in a ratio of 1:10 it was found that the …

Decoding Daily Life, Howard Granowitz

Theses

None provided.

A Discussion Of My Work, Lynne Hull

Theses

None provided.

Effect Of Logo Programming On Mathematical Problem-Solving Skills, Gwynn Newman

Theses

As a result of an interest in determining effective means of utilizing computers in education, this study was conducted to investigate the effects of programming instruction in the computer language of Logo on mathematical problem-solving skills. It was predicted that students who experienced instruction in Logo would achieve significant gains in mathematical problem-solving skills.

During the 1984-85 school year a sample of 30 third grade students from the Wentzville R-IV School District was randomly assigned to two groups. The first group participated in an after-school program where they received 12 one hour sessions of instruction in the turtle graphics portion …

The Effect Of The Voluntary Desegregation Program Upon Thorndell School, Diane Murrey

Theses

This paper is a study and description of how one school was affected by and involved in a court mandated desegregation program. The thesis deals with the teachers and how their lives were affected with the introduction of the mandate.

The fourteen teachers interviewed had been in the Thorndell School for many years and, thus, were able to be an integral part of the newly instituted program. They were able to give candid descriptions of the changes at the school with the full knowledge of "how it had been" as well as "how it is now."

These t 3achers, as …

An Investigation Of The Competition Between Surface/Internal Latent-Image Formation In Agbr Core-Shell Emulsions, A. Gary Difrancesco

Theses

The models for surface /internal latent-image formation by J.F. Hamilton and others were qualitatively investigated. Techniques were also developed to precipitate core-shell emulsions. Although the emulsion precipitation system employed was not highly stable, the major aspects of surface/ internal latent-image competition were successfully demonstrated. It was found that the level of surface /internal latent-image competition has a significant effect on the photographic response of core-shell emulsions.

At&T Technologies' Marketing Philosophy: The Impact Divestiture Had Upon It, Cynthia Gerard

Theses

The marketing mindset at AT&T Technologies , Inc.-does one exist? This thesis is prepared by a Lindenwood College student and employee of AT&T Technologies, Inc. inspired by t he academic excellence challenge as well as established professional career objectives. The goal of this thesis is to analyze the marketing efforts instituted at this Company.

The literature utilized in conjunction with this research was derived from published material. This was done to preserve the integrity and proprietary needs of such a business . Any recommendations, analysis, and conclusions are made from the basis of this author acting in a consulting capacity. …

Introducing Sexuality Into Contraceptive Counseling: A Training Manual, Allison Mcghee Hile

Theses

The present work is a training manual to be used with family planning counselors to increase their skills in dealing with sexual topics . Along with providing basic information about sexual anatomy and physiology , it attends to the issue of allowing sexual concerns to come up in a brief contraceptive counseling situation . This includes how to recognize when a client needs help with a sexual concern , how t o listen and discuss comfortably , and how to refer for more in depth counseling. It is based on the premise that a great number of people in our …

Using Natural Language For Database Queries, Mikel J. Brown

Theses

Not provided.

An Investigation Of The Effects Screen Ruling And Dot Structure Have On Dot Gain On Offset Newsprint, Dawn Link

Theses

Dot gain is an inherent problem in printing on any substrate. Studies have been conducted in an effort to try to isolate the causes of the variables in the printing system to determine their influence on dot gain. The literature indicated some good reasons to suspect that course screen ruling would yield less dot gain than finer screen ruling. Investigations dealing with the effect that screen ruling has on dot gain have not yet been conducted. This study attempts to isolate the screen ruling which can yield the lowest amount of dot gain when printed on newsprint using square, round, …

Ektachem Evaluation, Barbara A. Meiklejohn

Theses

The Eastman Kodak Ektachem 400 Analyzer was evaluated in terms of its precision, linearity, accuracy, and interferences for two colorimetric tests (neonatal bilirubin and albumin), a two point rate colorimetric test (amylase), and four potentiometric tests (sodium, potassium, chloride and carbon dioxide). The precision study results obtained were comparable to those of other laboratory instruments for five of the seven tests under consideration. The exceptions were carbon dioxide at the high range (30 mmol/L) and albumin at the low range (2 g/dl). Linearity checks were satisfactory for all seven tests but albumin, where a negative bias was observed in readings …

Design And Implementation Of A Communications Package To Network A Group Of Microcomputers, Narayan J. Kulkarni

Theses

With the development of VLSI technology, more and more desktop computers are coming into the marketplace. A need is often felt to network these computers together to share their resources for a larger application where the data needs to be interchanged between these computers. This thesis work is an attempt to design and implement a communications package that allows various desk-top computers to communicate between each other by exchanging data between them. The computers in this network send data to each other through a central message server. Physical medium of communication between these systems is standard RS-232C communication lines. The …

Identifying Mechanisms (Naming) In Distributed Systems: Goals, Implications And Overall Influence On Performance, Wilfredo Rodriguez

Theses

Not provided.