Engineering Commons^™

The Compatibility Of Mild Carbon Steel And Water In A Heat Pipe Application, David D. Kenney

Mechanical Engineering ETDs

The phenomena that govern the performance and affect the lifetime of heat pipes are reviewed. The phenomena include the corrosion of metals by aqueous solutions, the diffusion of gases through metals, and the effects of hydrogen on metals. Heat pipes of 1015 C.D. carbon steel were fabricated and operated with a control group of 304 stainless steel heat pipes over the temperature range from 140° to 300° C. Results indicate that carbon steel/water heat pipes perform as well or better than 304 stainless steel/water heat pipes over the temperature range covered in this test.

State Estimation Using Parallel Extended Kalman Filters Of Nonlinear Measurements, Thomas Carlyle Sheives

Electrical and Computer Engineering ETDs

The extended Kalman filter applied to state estimation using nonlinear measurements has demonstrated divergence in many applications involving large initial uncertainties because of "invalid" linearizations performed by the filter on the nonlinear measurement functions. No quantitative results can be found as to how invalid these linearizations must be before divergence occurs. This report attempts to fill this void by deriving the extended Kalman filter as an approximate nonlinear least squares estimator, through the minimization of a measurement squared error function. The convergence of the extended Kalman filter is then determined by examining the squared error function and verifying the usefulness …

Development Of An Integrated Program Of Water Reuse In A Pulp And Paper Mill, Zafar M. Chaudhri

Masters Theses

No abstract provided.

Lee's Moment Method Applied To Binary Flow In Jet And Channel Devices Used For The Aerodynamic Separation Of Uranium Isotopes, Edward Eugene Holcomb

Mechanical Engineering ETDs

Lees' moment method is applied to the problem of compressible, binary flow of uranium hexafluoride gas through a parallel plate chan­nel. The time-dependent numerical problem is solved to yield the steady state solution. The results obtained are preliminary to the solution of the flow field for the curved nozzle and colliding jet devices used in the aerodynamic separation of uranium isotopes. Lees' concept of two-sidedness of the distribution function doubles the number of variables required to describe the system, and the resulting set of moment equations is not easily solved. The assumptions of isothermal, hydrodynamically fully developed flow are made …

Separations Of Dilute Solutions By The Smooth Deposit Approach Of The In-Situ Indirect Freezing Process, Jeng-Hung Lue

Chemical and Biological Engineering ETDs

The main objective of the present study is to demonstrate experimentally the feasibility of applying the smooth deposit ap­proach of the in-situ indirect freezing process to the separations of both dilute organic mixtures and aqueous mixtures. The in-situ indirect freezing process with in-situ washing and melting opera­tions was first introduced by C. Y. Cheng and S. W. Cheng [1].

Theory And Design Of Cyclotron-Wave Traveling-Wave Amplifiers, Arthur H. Gottfried

Dissertations

A theory and design procedure for traveling-wave tubes using cyclotron-wave interactions is developed. An analysis is presented of the energy exchange mechanism and the axial beam velocity spread induced by the r.f. interactions. The analysis of the energy spread in a realistic model of the beam with nonzero size and nonzero space-charge density shows that higher maximum efficiencies at higher power is attainable (with collector depression) in cyclotron-wave amplifiers than in synchronous-wave amplifiers.

A one-watt, and a ten-watt cyclotron-wave amplifier at 3 GHz, utilizing bifilar helix circuits, scaled from a 2 kW, 5 GHz design, were constructed. A computer was …

Adsorption Capabilities Of Adsorbents For Selected Toxic Air Pollutants, Richard Michael Vaccaro

Theses

The relative adsorption capacities of seven toxic, volatile organic air pollutants of either proven or suspected carcinogenic potential were tested on various adsorbents. Tests were run at flow velocities similar to those set in field sampling. This allows for extrapolation of test results to actual ambient air sampling systems. Experimentation was performed using a gas chromatograph (G.C.) equipped with a flame ionization detector. Sample introduction was carried out using the "displacement method" where the sample is introduced to the adsorbent cartridge as a plug.

Incipient elution volumes (V_N), normalized for bulk adsorbent packing volume, were obtained at various …

Optical Fiber Dispersion Characterization, Alan Edward Geeslin

Retrospective Theses and Dissertations

This thesis discusses the dispersion of optical pulses in fiber waveguides. Procedures for determining the transfer function of an optical fiber using either time domain measurements or frequency domain measurements are given. A test set is described which uses time domain measurements for dispersion characterization. Complex transfer function data are presented for various fiber lengths as well as optical connectors. Prediction of bandwidths of long fibers from bandwidth/measurements taken on shorter length fibers is discussed. A relation between the bandwidth of cascaded connectors in terms of the bandwidth of a single connector is obtained.

The Effect Of Ozone On Trihalomethane Precursors In Raw And Magnesium Treated Lake Washington Water, James Kent Kimes

Retrospective Theses and Dissertations

A bench scale laboratory ozonator was constructed and determined to produce 27 mg O3/hr. A contacting system and experimental procedure was developed to approximate a mass balance of 0, 1, 2, 4, 8 and 16 ppm were applied to raw and magnesium treated water from Lake Washington which is the potable water source for Melbourne, Florida. The effect of ozone on trihalomethane precursors was studied by comparing THM formation at 1, 24, 48, 72, and 96 hours following chlorination. The concentrations of each specie, chloroform, bromodichloromethane, dibromochlormethane and bromoform are reported. The highest 96 hour TTHM concentrations reported were 2773 …

The Theory And Application Of Frequency Domain Deconvolution Using Optimum Compensation In Time Domain Measurement, Robert Bruce Stafford

Retrospective Theses and Dissertations

This thesis describes a method of transforming a deconvolution problem into an equivalent convolution problem. A short discussion of the theory behind convolution and deconvolution is included, along with a survey of techniques now being used. A new method using a synthesized compensator is proposed and mathematically developed. Finally, the results of applying this method to several real and analytical signals are given.

A Feasibility Study Of Computer Aided Coding Of Ground Operations Aerospace Language (Goal), Harvey Glenn Lanier

Retrospective Theses and Dissertations

The introduction of a new checkout language at Kennedy Space Center has required more effort to create test and operations software than anticipated. The new language is called GOAL, for Ground Operations Aerospace Language. The feasibility of a computer aided GOAL coding system that would reduce the effort required to create GOAL programs is investigated in this report. A background of GOAL, its coding requirements, and the facilities used at present for GOAL coding is presented first. Next, the computer aided GOAL coding concept is presented, and requirements for such a system are developed. After the requirements are presented, a …

Simulation Model To Evaluate Performance Of Operational Systems And Their Impact On Repair Shop Activity At A Navy Field Site, James T. Newell

Retrospective Theses and Dissertations

This paper presents the background and procedures leading to development of a simulation model to analyze the impact of certain decision variables on operational system performance and workloads as the repair facility of a typical Navy field site. The research examines the impact of maintenance support concepts, as implemented by changes in the decision variables, associated with the broader application of Automatic Test Equipment. The initial effort consisted of data collection and field site surveys which culminated in defining a work flow model illustrating typical repair facility operations. The work flow model is translated into a computer simulation model. The …

The Development Of New Filter Functions Based Upon Solutions To Special Cases Of The Sturm-Liouville Equation, Stephen Joseph Chapman

Retrospective Theses and Dissertations

Two common classes of filter functions in use today, Butterworth functions and Chebyshev functions, are based upon solutions to special cases of the Sturm-Liouville equation. Here, solutions to several other special cases of the Sturm-Liouville equation were used to develop filter functions, and the properties of the resulting filters were examined. The following functions were explored: Chebyshev functions of the second kind, untraspherical functions of the second and third kinds, Hermite functions, and Legendre functions. Filter functions were developed for each of the first five polynomials in each series of functions, and magnitude and phase responses were tabulated and plotted. …

Ecological Responses Of Lake Eola To Urban Runoff, Harvey H. Harper Iii

Retrospective Theses and Dissertations

Lake Eola is a land-locked lake located in downtown Orlando, Florida. Its surface area is approximately 27.0 acres (11.0 Ha) and water depth is 2 to 3 feet (0.6 to 0.9 meters) near the shore and 22 feet (6.7 meters) toward the center. Periodical water samples were collected from the lake and storm drains for various stormwater events and physiochemical parameters were analyzed to calculated loading rates from nutrients and heavy metals released to Lake Eola. Algal bioassay studies were performed to investigate stormwater impacts on productivity. Periodical water samples were collected from the lake mixed and filtered for limiting …

Bipolar Bit Slice Microprocessors, Mack Duggan Cooley

Retrospective Theses and Dissertations

The purpose of this paper is to undertake a survey of state of the art high speed bipolar bit slice microprocessor elements. Three systems are discussed: The 2900 microprocessor family; the 10800 microprocessor family and the 8X02 microcontroller. A description of the microprocessor and microprogram controller elements for each family is presented and an example of the 2900 family is discussed.

Reliability Analysis Of Emergency Telephone System Models, Thomas J. Hobbs

Retrospective Theses and Dissertations

Several alternate systems for use in implementing the 911 emergency system in Orange County, Florida were investigated. The proposed systems were compared with the already existing systems on the basis of reliability, response time, and cost. System reliability was the prime consideration of the study. Flow charts of each system were formulated in order to determine the functions required of equipment and humans. The reliability was then determined by examining the difficulty of the tasks that each was required to perform. Reliability models of the present and proposed systems were constructed. By examining these models and comparing the reliabilities, response …

A Microcomputer Implementation Of Real Time, Continuously Programmable Digital Filters, William Edward Storma

Retrospective Theses and Dissertations

When a filter transfer function in s is replaced with the bilinear transform in z, the resulting discrete model represents the original continuous model within a second order accuracy of integration. A unique set of recently discovered minimum memory algorithms that perform the bilinear transform on a continuous transfer function are implemented on an INTEL 8080 microprocessor system. Scaling techniques are used to frequency scale all transfer functions to a standardized frequency. All data words are represented in a signed binary double precision format to maintain higher calculation speed and accuracy. Three test case transfer functions of different order are …

Calculation Of The Singularity Expanision Method Parameters From The Transient Response Of A Thin Wire, Kah-Song Cho

Electrical and Computer Engineering ETDs

The problem of determining the singularity expansion method (SEM) parameters from transient thin-wire data is exam­ined. A computer code is used to generate response data. The SEM parameters are computed from these data. For noisy data, it is shown that the parameter values can be improved by signal averaging.

Digital Signal Processing With An Adaptive Delay Element, Delores Maria Etter

Electrical and Computer Engineering ETDs

A new element, the adaptive delay, is developed as a means for synchronizing two signals that are highly correlated. An LMS error function derived and gradient techniques are used to determine an adaptive delay algorithm. Like Widrow's adaptive filter coefficient algorithm, this adaptive delay algorithm does not explicitly utilize a priori statistics on the input signals. However, unlike the LMS error function for the adaptive filter, the LMS error function for the adaptive delay is not quadratic. Thus, the error function will be required to be unimodal in order to assure convergence of the adaptive delay to its optimum value. …

A Preliminary Investigation Of Physical-Chemical Treatment Of Slagging Gasifier Aqueous Effluent, Kirk B. Hird

Theses and Dissertations

The feasibility of treating slagging gasifier wastewater by physical-chemical means was studied. Pretreatment and treatment flow schemes were developed by using batch and continuous tests. Results were based mainly on wastewater residual total organic carbon (TOC). A treatment facility was designed and economically evaluated.

It was found that slagging gasifier wastewater is treatable by physical-chemical means using activated carbon and chemical oxidation as the two principal treatment steps. A pretreatment scheme consisting of lime addition, ammonia stripping, and recarbonation-coagu- lation was found to sufficiently purify the raw gasifier liquor so that activated carbon adsorption and chemical oxidation could be applied …

A Survey Of Structural Identification Techniques, Doris Evelyn Miller

Mechanical Engineering ETDs

This work is a collection and survey of system identification methods in the open literature. The motivation for the work was to find suitable methods of system identification for use in structural diagnosis. Methods surveyed include those which identify the system in terms of modal parameters, and those which identify the system either nonparametrically or in terms of arbitrary parameters. Both deterministic and stochastic methods are reviewed. Particular emphasis is placed on determining damping coefficients, and on a formulation known as modal synthesis. It is concluded that stochastic methods are better suited to the problem of structural diagnosis, and that …

Assessment Of Corrosion And Scaling In A Low Temperature Geothermal System, David Bruce Orrell

Chemical and Biological Engineering ETDs

The feasibility of a low temperature geothermal system to be located in the area immediately surrounding Albuquerque, New Mexico, was assessed with respect to corrosion and scaling. Theories of corrosion and scaling were explored and an extensive literature survey was performed to predict trends and apply design criteria and guidelines regarding corrosion and scaling from other geothermal environments to the proposed geothermal installation in Albuquerque. A recirculating corrosion test loop was built, and fifteen metals were tested for general corrosion resistance in seawater at 190° F and 3 ft/sec flow velocity. Results show this test procedure to be viable and …

Employee Attitude Invariance: A Guide For Personnel Practitioners, Robert A. Cohen

Retrospective Theses and Dissertations

No abstract provided.

A Microcomputer Implementation Of A Flight Simulator Visual Display System, Jerry Wayne Campbell

Retrospective Theses and Dissertations

The use of computer graphics has brought about a universal means of depicting phenomena or solving engineering problems. The combination of graphic and computer skills offers a solution to a number of technical needs. One major area that computer graphics can be used is in the field of flight simulation. The software packages necessary to project three-dimensional scenes for flight training are not very common. The purpose of this paper is to generate the programs necessary to allow the pilot to observe a three-dimensional scene from any location and angle. The report discusses some of the basic aspects of computer …

Software Quality Assurance, Edward C. Soistman

Retrospective Theses and Dissertations

The problems associated with software development and use are investigated from a management point of view. Having identified the critical aspects of effective software management, an approach is suggested for the creation and implementation of a software quality assurance program, Particular attention is focused on the concept of Life Cycle Procurement as currently utilized by the Department of Defense. The research was accomplished in two phases. The first consisted of an extensive literature search, seminar attendance and participation in several working groups assigned the responsibility for establishing software quality assurance guidelines. The second phase involved direct participation in the development …

The Development Of Quiet Jet Engine Technology, Bradley D. Beck

Retrospective Theses and Dissertations

The physical properties and subjective characteristics of sound and several special methods of measuring sound levels are discussed in order to provide a basic understanding of sound in general and noise in particular. The Federal Aviation Administration's regulation, FAR36, which stipulates the allowable perceived noise levels produced by commercial jet aircraft, is examined in detail. The principle of jet propulsion, the basic components of turbojet and turbofan engines, the theory of aerodynamic sound and the origin of the perceived noise decibel (which is the basic unit for measuring aircraft noise) are presented to provide an understanding of the fundamentals of …

Treatment Process Variations To Reduce Tthm Residuals In A Finished Water, Edward L. Hatcher

Retrospective Theses and Dissertations

This research investigates organic polymers, inorganic coagulants and separate unit operations for their effect on the total tri-halogenated (TTHM) residuals in a finished water. The water samples utilized for this project were taken from a highly colored Central Florida potable water supply which is used by municipality which has a TTHM concentration in the finished water in excess of the proposed Federal limit. Results indicate that (1) organic polymers are not a significant source of THM precursors, (2) organic polymers, when used as a settling aid after coagulation in Jar tests, are an effective means of filtration for removing THM …

Continuous Fractionation Of Protein Mixtures By Ph-Parametric Pumping, Yuk-Wei Wong

Theses

Continuous pH-parametric pumping separations of a haemoglobin - albumin - CM Separose system were experimentally investigated. The parapump system has a feed, containing the protein mixture to be separated, introduced alternately to the top and bottom of the chromatographic column. The top and bottom products are withdrawn from the apparatus during the bottom and top feed respectively. It is shown that under certain conditions the pH-driven parametric pump has the capacity for removal of a protein component from one product fraction and large enrichment in the other fraction. Moreover, the continuous process can be operated with a large feed throughput.

Periodate Oxidations Of Aminoglycosides, Araxy M Deronian

Archived Theses and Dissertations

No abstract provided.

A Comparative Analysis Of Intrusion Of Incisor Teeth Achieved In Adults And Children According To Facial Type, Ronald L. Otto

Loma Linda University Electronic Theses, Dissertations & Projects

A comparison of incisor intrusion achieved in deep bite adults and children was made. Facial type was also examined for affect upon intrusion achieved. Fifty-five cases treated with Bioprogressive mechanics were studied cephalometrically, including twenty-four adults and thirty-one children. Neither age nor facial type was found to be statistically related to the amount of incisor intrusion achieved in this sample. A method of measuring intrusion at the root apices was devised which was felt to give a more accurate indication of actual bodily intrusion. More external root changes during treatment were observed for adults than for growing children. Wide latitude …