Digital Commons Network^™

Mathematical Modeling And Computer Simulations Of Biodenitrification In Batch And Sequencing Batch Reactors, Sugata Sanyal

Theses

Mathematical models have been derived for describing biodegradation of ni¬trate and nitrite in an anaerobic environment. Monod model for nitrate and Andrews model for nitrite were used as kinetic models. Experimental data from literature suggest that nitrate is not an inhibitory substance, while nitrite is not only inhibitory but it may also have a toxic effect on the biomass. The models were brought in dimensionless form in order to reduce the number of parame¬ters. Biodegradation was mathematically described for a batch, and a sequencing batch mode of operation. Computer programs were developed for numerically simulating the process. Some of the …

Token Bus Lan Performance : Modeling And Simulation, Ramesh Kurnool

Theses

A simulation model based on CSIM, a process oriented simulated language, to analyze the performance of the Token Bus protocol is developed. Performance measures such as throughput, average delay and maximum delay per packet are presented. System performance is analyzed for different loads, number of stations, network lengths, different physical and logical distribution of the stations with packet length as a parameter. Previous studies were based on the delay-throughput analysis with no discussion on the effect of variation of the logical and physical distribution of the stations on the performance of the model which is done in the present thesis. …

Interconnection Of X.25 Networks, Syed Ayaz Qutubuddin Ahmed

Theses

The purpose of this work was to investigate the performance of two interconnected X.25 networks via CCITT internet protocol X.75. Since internet protocol X.75 follow the same flow approach as X.25, we are allowed to model the acknowledgement queue in such a way that this queue provides a feed back path from destination to the source queue. Thus we are able to model our interconnected network as a closed queueing network with limited number of packets in transit within the network. Mean Value Analysis with Blocking (MVA) algorithm was applied to obtain the performance characteristics as the resources available were …

Cryogenic Characterization Of Potential High Temperature Superconducter Substrates At Microwave Frequencies, Sukhmani Kaur

Theses

The lack of characterization data for dielectric substrate materials at microwave frequencies and cryogenic temperatures hinders the development of high T_c superconducting circuits. Low loss (tanδ < 10^-4) substrates with dielectric constants in the range of 5-100 at cryogenic temperatures are needed to realize the advantages of superconductor circuits. Measurement techniques previously reported are either time consuming or inaccurate. We report an adaptation of Courtney's method for accurate, simple evaluation of complex dielectric constants (10 < ε_r < 100) at low temperatures. The fixture was calibrated using known properties of polycrystalline ZrSnTiO4. We measured er and tans on three potential substrate materials, Al₂O₃, MgO, and LaAlO₃ at 5-10 GHz in the temperature range 77-300K. No temperature hysteresis in either ε_{r …}

A Theoretical Model For Radio Attenuation Inside Buildings, Kyu-Sung Kim

Theses

Research to expand the capability of indoor, portable, radio frequency links for voice and data transmission is being pursued worldwide. Sophisticated communication systems using digital portable radio telephones have been proposed. To accomplish this goal, it is necessary to ascertain the attenuation of electromagnetic signal propagation inside buildings. Because modeling of the indoor environment at radio frequencies is very complicated, most publications document experimental results. In this study,. a theoretical model is proposed for predicting path loss inside buildings. The theory involves a waveguide model of the indoor environment which permits a rigorous modal solution similar to that developed by …

Shear Behavior Of Steel Fiber Reinforced Concrete Beams Under Monotonic And Cyclic Loads, June Suh

Theses

Up to now relatively few tests have been reported on shear behavior in fiber reinforced concrete beams. Even less experiments have been carried out under fatigue loading. In the present experiment, the reinforced concrete beams with 1 percent and 2 percent steel fiber volume fraction are investigated. Conventional stirrups are included in number of beams at certain intervals. Beams are loaded under monotonic and cyclic loads. The strength of beams are determined and the behavior of beams under each loading are observed in order to determine some advantages of adding steel fibers to reinforced concrete beams.

It has been found …

Modeling Packed Bed Catalytic Reactors, Jing Yang

Theses

Catalytic reactors provide a potentially important tool in the control of process emissions to the environment. This work provides a detailed chemical/physical model for analysing the operational characteristics of packed bed catalytic reactors. Mass, momentum, and energy conservation equations are written for the gas and solid phases. Heterogeneous and homogeneous reactions are used to convey the required stoichiometry, reaction rate, and heat release rate. Reaction in each phase is modeled as a one-step, global reaction. Heat and mass transfer, fluid friction, and axial heat conduction in the solid phase are modeled using suitable literature correlations. The resulting non-linear, first-order differential …

Effects Of Fly Ash And Kiln Dust On The Compressive Strength Of Cement Mortar, Yitao Yu

Theses

Fly ash generated from coal-burning power plants has been an increasing problem to the utility company in terms of storage and disposal in compliance with the environmental regulations. Presently, fly ash has been widely used in the concrete mix. Research shows that fly ash can improve many properties of fresh and harden concrete. Landfill is another significant usage of fly ash. Usually, fly ash is stored in dry and weathered conditions. The properties of fly ashes from different sources and in different storage conditions are different.

In this research, the compressive strength of mortar containing cement replacement of Deep Hollow, …

Automatic Infrared Inspection Of Solder Joints On Mounted Circuit Boards, Ken Kekuan Zhou

Theses

This thesis reports the research work on automatic infrared and visual light inspections of solder joints on printed circuit boards (PCBs) utilizing an image processing system and statistical pattern recognition techniques.

A small scale image processing system, consisting of a SUN workstation and several DATACUBE modules, is set up for the research. Software packages for imaging, displaying and solder joint inspection are developed and ready for public usage.

The capability of infrared inspection for solder joints on PCBs is demonstrated. The fusing of infrared and visual light imagery for the inspection is shown to offer better results than that obtainable …

The Accreditation Of Professional-Technician Occupations, Michael William Allgaier

Theses

This study investigates the relevance of different elements of accreditation as applied to professional and technical occupations. The impact of essential elements of typical accreditation programs on the outcome of the credentialing process is studied. The credentialing process is viewed in the context of how it affects the public safety, health and well being of society. The health, legal, engineering, and educational professions are analyzed to form a conventional professional base of comparison with the emerging professional-technical occupations in the nuclear industry, especially nondestructive examiners.

Nurses, attorneys, engineers, and teachers accreditation programs are analyzed for their strengths and areas for …

An Implementation Of Mht Algorithm For Adaptive Transform Coding Of Speech, Peter Battenschlag

Theses

The Modified Hermite Transform (MHT), a suboptimum block transform scheme, is implemented on a TMS320C25 signal processing system with the objective of reducing the redundancy in speech signals and transmit a quantized vector representation at bitrates as less as 0.5 bits per sample.

The generation of the Hermite polynomials with a binomial and several first order IIR filter structures is presented focusing on the fact that no muliplications are required which simplifies the MHT algorithm considerably.

An assembler program performs forward and inverse transformation together with a vector quantization using adaptive bitallocation based on short-time statistics for the transform coefficients. …

The Oxidation Of Methylene Chloride Over Manganese Dioxide Catalyst, Jun Du

Theses

This research presents results from a study with the goal of using a transition metal oxidation catalyst, manganese dioxide (MnO₂) I to convert low concentrations of methylene chloride (CH₂Cl₂) in air and in a methane/air stream into CO₂, H₂O and HCl. Our objectives were to determine the oxidative effectiveness of the catalyst and its durability under the corrosive exposure to chlorine, HCl and other likely stack gas contaminants.

Experiments were carried out in a tubular packed bed integral reactor using gas chromatographic (FID and TCD) analysis for chlorocarbons and non-dispersive …

An Investigation Of The Dynamics Of Abrasive Waterjet Formation, Md. Ekramul Hasan Khan

Theses

The aim of this research was to investigate the jet formation and the jet behavior, as characterized by the velocity field, the force exerted by the jet on a work-piece and the jet geometry. The velocity and force distributions were measured using a laser transit anemometer (LTA) and a piezoelectric force transducer (PFT) respectively for constant water pressure (334.6 MPa) supply. The jet structure and its instantaneous behavior were visualized by the used of high speed filming. LTA and PFT measuring techniques were established and verified. The measurements were performed under different operating conditions. It was found that at a …

Eeg Mapping Using The Personal Computer, Zhuan-Zhang Pei

Theses

An approach for brain electrical activity mapping using a personal computer has been investigated to enhance the visibility of the EECs. An automatic procedure from data acquisition to the final mapping has been developed for on-line or off-line data processing, in which a table-look-up technique has been introduced to eliminate redundant processing. The power spectra in different EEC frequency bands for four electrodes are coded into 15 colors and mapped on a color monitor. The data correspondings to the areas between electrodes are interpolated by the surface spline method. The mapping speed and smoothness has been optimized. An experiment has …

A Comparative Study Of Cadmium Uptake By Cells Of Gram-Positive And Gram-Negative Bacteria, Shubhangi Rajan Bhende

Theses

Cadmium uptake by cells of Gram-positive and Gram- negative bacteria was studied. Gram-positive and Gram- negative bacterial cells were separated from activated sludge collected from the Parsippany Troy Hills Water Pollution Control Plant (NJ) by isolating them on agar plates. These were grown separately and used for uptake experiments.

Gram-positive bacterial cells showed 17% more uptake of cadmium as compared to Gram-negative cells at 30°C and pH 6.6. More than 95% of the total cadmium removal from the solution was observed during first 5 min. of cell-metal contact time. In case of Gram-positive bacteria cadmium uptake decreased by 5-10% after …

Mathematical Modeling And Simulation Of The Progression Of Aids, Anju H. Nagpal

Theses

Acquired Immunodeficiency Syndrome (AIDS) caused by Human Immunodeficiency Virus (HIV) is a pernicious disease acknowledged as a world health problem. One of the major issues in the study of AIDS is understanding the manifestation and the progression of the disease following the transmission of HIV. Unfortunately, the present state of biological knowledge does not yet give us a reliable means of evaluating these phenomena. A simulation approach is, therefore, extremely useful in predicting the various phases of the deteriorating physiological status of the patient. In the present study we have focused on the development of a mathematical model of the …

Design Of A Real Time Optical Sensor For Continuous Blood Cell Separation, Girish S. Yerande

Theses

For continuous measurement and display of oxygen saturation and RBC content in blood during cell separation a reflection type optical sensor is designed based on the theoretical model using the photon diffusion theory. The prototype sensor consists of two arrays of light emitting diodes, red and infrared, and photodiodes. The emission wavelength of LEDs are 660 nm and 800 nm. The 800 rim which is in the infrared region is very close to isobestic value for blood. The prototype sensor is mounted on the blood cell separator equipped with an antitwister mechanism. Each LED emits a specific wavelength of light …

Configuring Maps For A Satellite Communication Network By Self- Organization, Yizhong Chen

Theses

There are several management tasks in a telecommunication network. Among which traffic management is one of the most important and difficult tasks. It is concerned with maximizing network efficiency when the network is under stress either due to overload or failure. New attempts to automate this task such as expert system based approach are yet to be perfected. In this thesis, we advocate a new concept of traffic management. Our scheme consists of two levels. At the first level, we introduce a Self-organization model to dynamically configure a map for a satellite communication network. The second level is a routing …

Thermal Desorption Of Contaminated Soils, Chengdi Dong

Theses

The objectives of this research are of twofold, namely, to investigate the desorption behaviors of hazardous constituents evolved from several types of contaminated soils, and to evaluate the in-situ thermal treatment of organic chemical contaminated soil.

Two clay soil minerals and a silty sand with five organic compounds, dichlorophenol, trichlorophenol, pentachlorophenol, trichloroethylene, and tetrachloroethylene (TCE) were used in this study. The desorption behaviors were evaluated by thermogravimetric analyzer (TGA) and a simulator of in situ desorption by heating probes. The results of TGA analysis revealed that a completely removal of organic contaminants can be achieved in a moderate temperature. They …

The Role Of Multinational Corporations In Nigeria : A Case Study, Eteng Bassey Eno

Theses

Multinational corporations in Nigeria are as old as Nigeria itself. This section has been recognized as an important area of economic activity which is capable of having both positive as well as negative economic implications regarding employment, technology transfer, international capital investments and other sociocultural issues in Nigeria. In Nigeria multinationals corporations (MNC) have virtually dominated such industries as cement, beer brewing, tobacco products, soap and cosmetics, chemicals, pharmaceutical, machinery, electric equipment and assembly activities ie. motor vehicle and bicycle. However, much as the host country is aware of the inherent danger posed by direct investment by transnational corporations, the …

Teaching Mechanical Design Using The Axiomatic Approach, Lisa E. Hailey

Theses

Many authors on the subject of design state that it cannot be taught, it must be learned through experience. This thesis offers a method in which design can be taught to senior mechanical engineering students. The axiomatic approach to design, authored by Dr. Nam P. Suh of the Massachusetts Institute of Technology, states that all good designs follow two axioms, the independence axiom and the information axiom. By teaching students to use these axioms, and the corollaries and theorems derived from the axioms, educators can teach students the basic concepts of good design.

To show how this approach can be …

Evaluating The Feasibility Of A Vendor Certification Program For A Mid-Sized Pharmaceutical Company, Clarice P. Johnson

Theses

To compete effectively in the global market-place of the 1990's, manufacturers and suppliers must give up the orthodox practices of the past and create more innovative, quality oriented partnerships. One way to do this is through vendor certification.

The implementation process is examined with particular emphasis upon total management involvement and commitment. A case study approach utilizes a literature search, questionnaires from a limited number of pharmaceutical companies in New Jersey, and questionnaires from primary and secondary component suppliers.

It is confirmed that the implementation of a vendor certification program is a slowly evolving process whose success is not dependent …

A Universal And Personal Art Through Tradition And Invention, Pamela Marie Larkin

Theses

None provided.

An Alphabetical Metamorphosis, Monica Granfield

Theses

None provided.

A Multi-Dimensional Visual History On The Upper Falls Of The Genesee River, Rochester, Ny, Bruce G. Robinson

Theses

None provided.

Historic Graphic Design At Rit, L. Clay Girouard

Theses

None provided.

Menu Design: A Typographic History, Janice M. White

Theses

None provided.

Rug Making: An Exploration, Karen Breen Cooper

Theses

The following pages were written out of the desire to know about the past, present, and future of rugs and the people who make them. In addition to studying written sources and questioning textile experts, searching of oneself became an integral part of the learning process. A journal was kept throughout the creative journey. Writing, questioning, and searching has become a large part of the creative process; therefore it was considered vital that some of these thoughts were shared. Technical proficiency with textiles has been viewed as having utmost importance. To master a skill, it should be learned, practiced and …

Entrapment Series: A Catalyst For Response, Cynthia Jansen Miller

Theses

None provided.

Improving Quality Consistency And Productivity Of Color Separators Utilizing The Dupont Image Manager, Enrique A. Arce B.

Theses

The magic key in any commercial transaction is to satisfy the customer's requirements. In the color separation market the customer's expectations are consistency in the product, and films that when printed will reproduce a clean visual match to the original copy. The variables that affect the quality, consistency, and productivity for the color separation process, were reviewed. The result of this review was that the operator's scanner set-up for tone reproduction is the most critical variable in the process. An estimate of the total cost in the United States caused by rescans due to inconsistency of the scanner set-up gave …