Digital Commons Network^™

Steady-State Operation Of Bench-Scale Activated Sludge Process Using Phenol And 2-Chlorophenol As Substrates, Jeffrey Richard Caputi

Theses

Experiments were conducted to determine whether a continuous process similar to the common activated sludge process could be operated at a relative steady state with phenol and 2-chlorophenol as the sole carbon sources. After a number of unsuccessful trials, process conditions were developed which allowed for operation at a relative steady state with respect to the concentration of microorganisms in the reactor and the concentration of phenol and 2-chlorophenol in the effluent.

Phenol and 2-chlorophenol were removed at better than 99 percent efficiency on a continuous basis. The mixed liquor grown under the conditions of the experiment was highly filamentous …

The Effect Of Inorganic Salts On Adsorption Of Organics By Fly Ash, Pai-Yuan Horng

Theses

Optimum amounts of inorganic salts ( monovalent, divalent, and trivalent chlorides ) added to various bituminous coal fly ashes in batch adsorption treatment experiments indicates the possibility of improving adsorption capacity.

Experiments were conducted on aqueous solutions of three priority pollutants : phenol, toluene, benzene. Both high fusion and low fusion fly ashes were used as sorbent materials. Removal of organic pollutants was measured using a total organic carbon analyzer.

Isotherm tests positively indicate that the addition of inorganic salts to fly ash significantly increases adsorption capacity. The study shows that removal of organic pollutants by fly ash depends on …

The Kinetics And Mechanism Studies Of Cathodic Electro-Initiated Crosslinking Polymerization Of Unsaturated Polyester Prepolymer, Joseph Yuan-Ji Sheng

Theses

The cathodic electro-initiated polymerization reaction of the unsaturated polyester prepolymer has been found to have the characteristics of the first order ionic initiation polymerization mechanism. The rate of polymer formation is directly proportional to the current intensity and voltage supplied, but inversely proportional to the reaction temperature. The rate of initiation can be expressed as a function of the initial concentration of the prepolymer, residence time and reaction temperature. The rate expression of the initiation step has been derived based upon the experimental data collected as follows:

ln W = k0 exp[-Ea/RT] Ca0 ln t + ln b

where k0 …

High Temperature Reactions Of Chloroform With Methane, Thomas Siozopoulos

Theses

The reactions of Chloroform with Methane were studied at atmospheric pressure in the temperature range of 550-800 deg C, and using three different reactor diameters.

The reaction was found to follow pseudo-first order kinetics in the presence of excess Methane and Argon, and the kinetic parameters were determined for each of the reactor sizes.

The resulting global Arrhenius expressions are:

For 0.4 cm ID Kexp = 2.03 * 10⁸ exp (-34000/RT)

For 1.05 cm ID Kexp = 9.86 * 10⁸ exp (-37950/RT)

For 1.6 cm ID Kexp = 4.17 * 10⁸ exp (-36760/RT)

An increase in the …

Modeling And Simulation Studies On Nmos Vlsi, Chang-Joo Kim

Theses

This thesis has two parts. The first part deals with the theoretical analysis and experimental verification of the variation of channel resistance and threshold voltage as a function of drain and source voltages in NMOS transistor with the substrate taken as reference. And the second part deals with simulation and optimization of the NMOS sense amplifier circuits.

Firstly, the NMOS transistor with the substrate taken as reference node is analysed and a set of formulas is derived for the variation of channel resistance as a function of the terminal voltages. Experimental results (using SCL 4007AE from Signetics) show good agreement …

An Image-Capable Interprocessor Link Communications Protocol, Robert W. Brown

Theses

Image-capable interprocessor links often require the use of specialized communications protocols due to the large amounts of data that can be transmitted and the high speeds at which the data can be transferred. Without a set of generalized image-capable communications rules, these protocols are commonly customized to each interprocessor link application. The image-capable interprocessor link communications protocol described in this paper (IPLIMP) has been designed to limit the need for such customization at a low level. In order to accomplish this, IPLIMP provides simple methods for synchronizing and controlling link operations, sending and receiving data, downloading additional protocol layers, and …

A Model For Automatic Optical Scaling Of Type Designs For Conventional And Digital Technology, Bridget Lynn Johnson

Theses

In the history of type design, two methods have been used to scale type-- to produce enlarged or reduced letterforms from a reference size. With original handcut fonts, designers performed optical scaling (scaling by eye) that varied the proportions of letterform features over a range of sizes in a nonlinear manner. That is, letterform feature proportions were size dependent. This was an entirely manual and intuitive process. More recently, however, the use of the lens, as well as computational and other technologies, has allowed letterforms to be scaled automatically from a reference character, a simple proportional enlargement or reduction. To …

The Variability Of A Web Offset Newspaper Press Run As Measured By The Eastman Kodak Company's Customized Color Analysis Target, John C. Meyer

Theses

The variability of a press run as measured by Eastman Kodak Company's Customized Color Analysis Target was studied and quantified in the areas of Pre-press requirements, Press Performance and Color Measurement. The test was conducted on a web offset newspaper press maintained to industry standards. The target was printed along with three halftones consisting of high-key, low-key and normal images. The halftone images were be used by the pressman to visually check and evaluate the press sheets during the run to maintain quality. A running color bar was also printed to provide densitometric readings. The test target was be evaluated …

Application Of The Dram Software For The Dynamic Analysis Of A Linkage Mechanism, Deepak Namdeo Rode

Theses

The study provides the application of the DRAM software for the dynamic analysis of a linkage mechanism and presents a simplified version of the DRAM user manual. This user manual appears in appendix C. The linkage which is used for the dynamic analysis consists of three rigid couplers. Crank 2 of this mechanism is responsible for transferring motion to the other links. Kinematic and kinetic results by DRAM are compared with analytical results. Good agreement was observed. Since the DRAM user guide is not easy to understand, it was necessary to write a user-friendly guide. Several types of kinematic and …

Development Of A Composite Material With Enhanced Electromagnetic Power Dissipation Characteristics, Lawrence R. Egan

Theses

The present work was undertaken to enhance the productivity of manufacturing operations that involve heating materials by increasing the possibilities for electromagnetic heat processing of materials. The approach taken was to design a composite material with suitable mixture formulae to have prescribed electromagnetic loss characteristics.

Investigation began by surveying industrial uses of electro-magnetic energy in heat processing of materials. From applications, the survey shifted to electromagnetic properties of materials with focus upon dielectric properties of materials. Several techniques were considered for altering the dielectric properties of a lossless plastic and the approach chosen was to dilute the base plastic with …

An Image Storage System Using A Relational Database Management System To Facilitate Picture Data Handling, Daryl G. Johnson

Theses

The Image Storage System (ISS) is a general purpose graphics facility for the storage and retrieval of pictures. ISS utilizes the capabilities of the Mistress Relational Database Management System, the Relation Interpreter Package and the CORE Graphics Package. The system was developed to illustrate that by utilizing a database system for the storage of the actual picture description, users can incorporate graphics into their applications very simply without becoming a graphics or programming expert. Through the database, image data can be shared between applications and changes or additions to the image will not require program modification. As a consequence of …

An Introduction Of The Theory Of Nonlinear Error-Correcting Codes, Robert B. Nenno

Theses

Nonlinear error-correcting codes are the topic of this thesis. As a class of codes, it has been investigated far less than the class of linear error-correcting codes. While the latter have many practical advantages, it the former that contain the optimal error-correcting codes. In this project the theory (with illustrative examples) of currently known nonlinear codes is presented. Many definitions and theorems (often with their proofs) are presented thus providing the reader with the opportunity to experience the necessary level of mathematical rigor for good understanding of the subject. Also, the examples will give the reader the additional benefit of …

Pygraph: A Graphic Front-End For The Paisley Executable Specification Language, Richard Willison

Theses

This project is an application software system providing a graphical interface to PAISLey. PAlSLey (Process Oriented. Applicative. Interpretable Specification Language) is an executable specification language developed at AT&T Bell Labs to model real-time systems. The interface provides the user with a tool to graphically depict a real-time system. The graphics package, called PyGraph, has been implemented on a Sun 3 in a multi-window environment. While developing a graphic, PyGraph generates a PAISLey specification template for the graphic image. The template is filled out by the user with assistance provided by PyGraph.

Integrated Voice/Data Through A Digital Pbx, Ian Schofield

Theses

The digital voice/data PBX is finally reaching its anticipated potential and becoming a major factor when considering the total communications picture for many businesses today. The digital PBX has always been the choice for voice communications but has lagged behind the LAN industry when it comes to data transfers. The pendulum has begun to swing with the enhanced data capabilities of third and fourth generation PBXs. The battle for the total communication market is quite fierce between the LAN and PBX vendors now. This research thesis looks at the history, evolution, and architecture of voice/data PBXs. It traces development of …

A Tool For Compiler Testing, Chung-Cho Oliver Cheng

Theses

A tool for compiler testing is implemented. The tool is driven by a BNF grammar extended by a device called control flags to incorporate those parts of a language that are not controlled by context-free rules (for instance, use of declared names). The tool produced two sets of program strings such that each production in the grammar is used at least once. One set is produced by Purdom's algorithm. The other is produced by a new algorithm designed by the author which builds a tree and then produces a set of strings from it for compiler testing. The program strings …

Assessment Of Classical Database Models For Representing Solids, Julia L. Deal

Theses

Solid modeling is being explored as a method of representing three dimensional parts for mechanical design and manufacturing. This work analyzes the data storage requirements of the Boundary Representation and Constructive Solid Geometry methods of representing solid models. The ability of the database models (Hierarchical, Network, and Relational) to support solid modeling needs is evaluated. The goal is to determine the database model(s) best suited to store and manage the graphical data for solid model representat ions . Background information about mechanical engineering, graphics, and database models is presented. Entity-Relationship diagrams are used to define data requ irements .

A Newsletter For Megasource, Robin Courtright

Theses

No abstract provided.

The Architectural Theme In Painting, Allene Jones Ricker

Theses

The architectural theme has been used in painting in varying ways as decoration, in landscape, as composition and as abstraction. From the first century until the Renaissance, architecture was used by artists as decoration or as a backdrop, setting the stage and framing the figures. Architecture as subject matter continued to evolve in a manner nearly parallel to the development of the landscape. Architecture in the form of Roman ruins, for example, was used in picturesque landscapes.

Architecture in landscapes developed into townscapes. In both Holland and Italy the townscape was painted extensively. The Venetian view painters were interested in …

A Comparative Study Of Four Major Knowledge Representation Techniques Used In Expert Systems With An Implementation In Prolog, Joann T. Hudgick

Theses

Knowledge representation is a central issue in Artifical Intelligence (AI) research. In order to solve the diverse and complex problems encountered, one needs both a large amount of knowledge and some mechanism for the management and skillful utilization of that knowledge. The basic problem in knowledge representation is the development of an adequate formalism to represent that knowledge. In this thesis I will discuss four of the major techniques for representing knowledge in expert systems: first order logic, production rules, semantic networks, and frames. Using Prolog as the implementation language, I will demonstrate that all of the above mentioned representation …

Design, Fabrication And Implementation Of A Hash Table Processor, Robert Paul Ketrick

Theses

Hash tables have been used frequently to implement organized data table storage. However, there is a great deal of overhead in executing the hash algorithm every time the table is accessed. Alternatively, a content addressable memory (CAM) is a hardware implementation of an organized data table. A CAM requires very complex hardware design for each memory cell and therefore yeilds a very low cell density on each chip. This requires a large number of expensive chips to implement a large hash table. In this thesis a simple hash function was designed into an integrated circuit using 4- micron NMOS technology. …

Software Estimating: A Description And Analysis Of Current Methodologies With Recommendations On Appropriate Techniques For Estimating Rit Research Corporation Software Projects, Norma Armstrong

Theses

This thesis investigated, described, and analyzed six current software estimation methodologies. Included were Boehm's COCOMO, Esterling's Work Productivity Model, Putnam's Life Cycle Model and Albrecht's Function Point Determination. An implementation strategy for software estimation within RIT Research Corporation, a consulting firm, has been developed, based on this analysis. This strategy attempts to satisfy key needs and problems encountered by RIT Research estimators, while providing cost effective, accurate estimates.

Display Of Molecular Models With Interactive Computer Graphics, Steve Wuter Yang

Theses

Computer graphics devices offer a way to present images of three-dimensional objects with enough detail to aid human understanding of the structure of molecules. In this thesis, the Computer Aided Molecular Design system (CAMD system) will illustrate this idea. The CAMD system is an educational package designed for students in high school. The user of the CAMD system can create different molecules and store these molecules into a relational data base for future display. A Relational Data Base Management system was implicitly implemented for the CAMD system.

A Toolkit For Uncertainty Reasoning And Representation Using Fuzzy Set Theory In Prolog Expert Systems, Marcelle M. Bicker

Theses

This thesis examines the issue of uncertainty reasoning and representation in expert systems. Uncertainty and expert systems are defined. The value of uncertainty in expert systems as an approximation of human reasoning is stressed. Five alternative methods of dealing with uncertainty are explored. These include Bayesian probabilities, Mycin confirmation theory, fuzzy set theory, Dempster-Shafer's theory of evidence and a theory of endorsements. A toolkit to apply uncertainty processing in PROLOG expert systems is developed using fuzzy set theory as the basis for uncertainty reasoning and representation. The concepts of fuzzy logic and approximate reasoning are utilized in the implementation. The …

A Domain Specific Expert System Tool For Building Photofinishing Process Diagnostic Systems, King Choi

Theses

The knowledge-based method is a new and useful technique to build computer systems for applications which are heuristic rather than algorithmic in nature. This paper discusses how the approach can be applied to photofinishing process diagnostics. A prototype system for diagnosing Process E-6 for Kodak Ektachrome films is built to understand the knowledge structure and inferencing criteria for photofinishing process. The experience gained from building the prototype Process E-6 diagnostic system has been applied to the design of an expert system tool for building photofinishing process diagnostic systems without the direct involvement of a knowledge engineer.

Fric: An Expert System To Recognize Fricatives, Karen A. Atkinson

Theses

In building a speaker independent continuous speech understanding sys tem, a method is needed to translate the speech signal to a phoneme string. Current recognition attempts based on statistical methods are not as accurate as desired and require vast numbers of templates for comparison. On the other hand, human experts can transcribe phoneme strings from spectrograms with a high degree of accuracy, without needing to match unidentified seg ments against identified templates. This paper discusses the development of Fric, an expert system for identifying fricative phonemes, intended to func tion as part of a phoneme identification knowledge source. Fric attempts …

A Computer Simulation Of Processor Scheduling In Unix 4.2bsd, Michael D. Grossman

Theses

This project is a study of the processor scheduling system in UNIX 4.2BSD. This study involved a computer simulation of the processor scheduling system. The preliminary work for the simulation included choosing a system, choosing and running a set of test processes on that system, gathering statistics from these runs, and constructing a model of the scheduling system. The model was then tuned to perform like the real system by introducing overhead into the model. The overhead was added using several variables in the model. Tuning consisted of adjusting the values of these variables until the performance of the model …

On The Proposed Integrated Services Digital Network, Robert Johnson

Theses

The ultimate aim of this dissertation is neither to increase the state of the art in networking technology nor to predict the future structure of telecommunications networks. It is an attempt to raise the awareness of both the author and the reader as to the evolutionary forces driving vast changes in the telecommunications field. The impact of these changes will significantly alter the way we live and conduct business in the Information Age. For those involved with the communications field, the ability to make sound business decisions will require an in-depth knowledge of the technology and services that compose ISDN. …

A Comparison Of The Collinear Mean And The Mean Sea Surface As Reference Levels For Altimeter Analysis In The Southern Pacific Ocean, Charles Beard

Theses

Satellites are used to study various oceanic phenomena, including sea surface temperature, color, and sea height variability (which is related to oceanic currents). In observing sea height variability from radar altimeters, three methods of analysis can be applied. They are the collinear or repeat track method, the cross-over difference method, and the mean sea surface method. All three are designed to remove the effects of geoid undulations from the altimeter records. This paper compares the collinear method with the mean sea surface method in a small geographic area. Both methods analyze the tracks of collinear altimeter data by subtracting a …

Investigation Of Steady Incompressible Flows In The Vicinity Of An Airfoil, Sivaraj Kailasapathy

Theses

O-type body-fitted coordinate systems are numerically generated about NACA0012 and NACA4412 airfoils. These coordinate systems are used to effect a coordinate transformation from the physical plane to a rectangular transformed plane. The software developed also has a coordinate contraction capability. Plots of uncontracted and contracted coordinate systems are presented.

The nonconservative, velocity-pressure formulation of the two-dimensional, steady-state Euler equations are transformed to the rectangular plane. The boundary conditions at the airfoil are determined by the source-panel method, following which, the explicit finite difference form of the transformed Euler equations are solved using a space-marching scheme. Non-lifting potential flow solutions are …

Development Of A Mathematical Model To Determine The Temperature Distribution In The Metal Layer And Hearth Of An Electrical Resistance Smelter, Kurt B. Carlson

Theses

A steady-state finite-difference heat transfer mathematical model was derived to determine the temperature distribution in the metal layer and the hearth of a cylindrical electrical-resistance smelter. The temperature distribution is required for the redesign of the refractory materials and their positions in the hearth to insure that the metal layer is kept molten at normal smelting temperatures and that mechanical and structural integrity of the hearth is maintained. An extensive literature search revealed that no previously defined model of this type existed and that consideration of a three-dimensional model was beyond the scope of this work. The literature search also …