Digital Commons Network^™

Multiple High Voltage Output Dc-To-Dc Power Converter, Don Cronin, Bertrand F. Farber, Hartmut K. Gehm, Daniel S. Goldin

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Disclosed is a multiple output DC-to-DC converter. The DC input power is filtered and passed through a chopper preregulator. The chopper output is then passed through a current source inverter controlled by a squarewave generator. The resultant AC is passed through the primary winding of a transformer, with high voltages induced in a plurality of secondary windings. The high voltage secondary outputs are each solid-state rectified for passage to individual output loads. Multiple feedback loops control the operation of the chopper preregulator, one being responsive to the current through the primary winding and another responsive to the DC voltage level …

An Innovative Instructional Unit On Manufacturing Concepts And Terminology For Junior High Industrial Arts, James K. Martin

Dissertations and Theses @ UNI

Although educators recognize the need for educational experiences that provide students with a basic understanding of the industrial technologies, too often students are not receiving the "hands-on" experiences related to industry. Numerous curriculum programs have been developed to provide the teacher with the necessary instructional materials and also provide students with educational-occupational guidance for the world of work. Yet, many of these programs are not being utilized by industrial arts educators.

Research has shown that most manufacturing curricula range from one to two semesters in length. In order for the teacher to wholly adopt one of these programs, considerable organizational …

An Evaluation Of Productivity And Efficiency In Work Scheduling In A Public Works Department, Kraig L. Gordon

Masters Theses

“Managers throughout the world frequently associate the meanings of productivity and efficiency with the capabilities and performance of employees. This approach is limited since productivity entails far more than the output of the labor force. The factors affecting productivity need evaluating to determine the significance they plan in the overall process.

Industry has attempted to improve its productivity posture by utilizing a multitude of concepts. Some of these concepts are time and motion studies and process planning. However, in the public sector, literature shows that little has been attempted to improve the productivity in public organizations.

The greatest portion of …

Intraframe Sequential Picture Coding, John A. Stuller, Bernd Kurz

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper Generalizes Time-Discrete Autoregressive Source Coding Results of Rate-Distortion Theory to Two Dimensions. a 2-D Discrete Autoregressive Source is Defined and Shown to Produce a 2-D Wide-Sense Markovian Field. the Rate Distortion Function of the Source is Then Obtained under Assumption of Gaussian Field Statistics and a Squared Error Fidelity Criterion. a Procedure for Generating an Ensemble of 2-D Codewords Whose Statistics Satisfy the Variational Equations for R(D) is Given. These 2-D Codewords Are, by Space-Time Mappings, 1-D Tree Codes, and It is Noted that a Tree Coding Theorem of Jelinek, Berger, Davis and Hellman Applies. the Problem of …

Signal Processing For The Multistate Myoelectric Channel, Philip A. Parker, John A. Stuller, R. N. Scott

Electrical and Computer Engineering Faculty Research & Creative Works

In the Multistate Myoelectric Channel, a Single Myoelectric Signal Source is Used to Control a Multifunction Powered Prosthesis. the Selection of a Prosthesis Auction Requires a Receiver to Process the Myoelectric Signal, Contaminated with Noise, and to Decide on the Basis of the Received Signal Which Function is Desired. Thus, the Channel Dearly Presents a Problem of Choice of Receiver and of Decision Strategy. Previous Solutions to This Problem Have Been Basically Empirical. in This Paper We Seek the Optimum Receiver Where Optimum is in the Minimum Probability of Error Sense. First a Model is Developed for the Bipolar Myoelectric …

Improving Qpsk Transmission In Band-Limited Channels With Interchannel Interference Through Equalization, S. H.R. Raghavan, Rodger E. Ziemer

Electrical and Computer Engineering Faculty Research & Creative Works

This paper describes the use of equalization in conjunction with channel filtering to improve QPSK transmission subject to both InterSymbol interference (ISI) and interchange interference (ICI). Performance bounds are computed using the nonclassical Gauss-quadrature rule (GQR) method. The signal-to-noise ratio (SNR) gain due to linear equalization over Non equalization is thereby obtained and presented. The performance of a linear equalizer thus obtained is compared with the Viterbi algorithm sequence estimator (VASE). In the absence of bounds for the VASE receiver under the channel conditions considered, simulation results are used to make the comparison. With a possible difference in the accuracies …

Probability Of Anomaly Expressions For Random Waveform Registration, George L. Bair, Gordon E. Carlson

Electrical and Computer Engineering Faculty Research & Creative Works

Registration by integral-square error correlation of one-dimensional Discrete Time waveforms which are treated as random processes with specified autocorrelation functions is considered. An important design parameter for this class of problems is the probability of anomaly (a false dip in the correlation function) because it gives an indication of system immunity to gross registration errors. Explicit expressions for this parameter are not possible, so bounds and approximations must be derived. Two upper bounds and an approximation for the probability of anomaly are derived here. The use of these expressions is illustrated by an example. The relative utility of these performance …

Design Of A Microprocessor Controlled Telecommunication System, George J. Maroutsos

Dissertations and Theses

Recent advancements in Large Scale Integration Technology have made available devices, such as microprocessors, analog gates and "three state" logic, that provide the designer with a wide range of possibilities in the design of telecommunication systems. A microprocessor and analog gates are utilized in this design to demonstrate the feasibility of implementing a flexible Telecommunication System. The microprocessor is programmed to control, through software, the system functions. The feasibility of systems highly adaptable to the needs of individual subscribers is thus demonstrated.

Pulse Evolution In Co₂ Lasers, Lee W. Casperson, M. J. Herbst, John J. Turechek

Electrical and Computer Engineering Faculty Publications and Presentations

Explicit formulas are examined for the development of optical pulses in gain‐switched or Q‐switched laser oscillators and for the distortion of such pulses in succeeding stages of laser amplification. The results are compared to data obtained with a TEA CO₂ oscillator‐amplifier system.

Water And Energy, Frank Ellis

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

Energy self-sufficiency or independence from foreign oil imports depends critically on the yet undeveloped domestic fossil fuel resources, particularly for the production of heat, which can be utilized in the conventional and technically feasible thermal energy cycles of steam-electric generators and prime movers, which can easily be replicated. An integral facet of the complex domestic energy development undertaking is the availability of water that may be required to convert the vast domestic coal and oil shale resources into usable energy forms. An orderly utilization of water resources must receive attention if sufficient development of fossil- fuel conversion energy systems is …

A Total Present Worth Economic Comparison Of Coal And Nuclear Fuel Energy Alternatives, Dennis M. Tulenko, Phillip F. Ostwald, Klaus D. Timmerhaus

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

This paper utilizes the total present worth concept to make an economic comparison for a 500 MWe electrical power generating station operated either with Eastern U.S. coal, Western U.S. coal or nuclear fuel. Arguments are presented to support the use of this concept for comparing the economic desirability of various energy alternatives used for generating electrical power.

The Impact Of Solar Central Electric Technology On The Regulated Utility, Donald A. Murry

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

The generation of electricity by solar energy in the U.S. is moving from the design stage to the pilot plant stage. Some persons have argued that at least some of the base line technologies are competitors now or are approaching parity with other energy sources, at least when the social costs and benefits are considered. This paper evaluates briefly the institutional framework of the regulated electric utility, the proforma impact of a solar electric plant upon an operational utility. We conclude that under the present regulatory/institutional framework, the solar electric technology will be developed at a date that is slower …

Optimal Fuel Supply Control For Electrical Energy Systems -- A Real Time Computer Technique, J. Derald Morgan, Richard Thomas Smith

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

The techniques of linear-integer programming are applied to the problem of supplying coal to power plants. A heuristic technique for optimizing the supply of coal to power companies is created. The optimization minimizes the purchase, transportation, and demurrage costs of coal subject to power system operations, power plant demands, coal purchase supply, power plant coal handling operations, and transport options. A procedure for calculation and analysis of cost sensitivity of optimal solutions to input data perturbations is presented which utilizes the optimizing technique.

The nature of the constraint set developed allows for the inclusion of loading and unloading operations in …

Energy Conservation In Aeronautical Ground Testing, R. W. Hensel

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

Large aeronautical ground test facilities, particularly continuous flow wind tunnels and engine altitude test cells, are large users of electricity. Because of the correspondingly high absolute cost of energy, these facilities generally maintain continual programs to minimize both energy and power levels consistent with achievement of testing objectives. The recent sharp increases in kilowatt-hour costs (overall rates doubled within two years at the U. S. Air Force's Arnold Engineering Development Center, for example) have resulted in a proportional rise in efforts to effect further economies. The various methods available to reduce electricity costs fall in three categories: (1) methods related …

In Situ Leaching Of Uranium, Nicholas H. Tibbs

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

In situ leaching is a relatively new production method for uranium with several advantages. It will contribute an increasing portion of uranium supply as production turns to deposits inaccessible to conventional mining methods.

Hazardous Wastes And Energy Recovery, Joseph Eigner, Mark M. Clark

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

An estimate of the energy potentially recoverable from waste oils, solvents, and other hazardous wastes is presented, along with a discussion of some of the technical, environmental, and Institutional barriers to energy recovery. A suggestion is made that electric utility furnaces with their high temperature and reliable operation might be used to safely destroy certain hazardous wastes. Other hazardous wastes may have to be carefully excluded from planned refuse derived fuel projects.

Biomass As An Energy Mechanism, E. C. Clausen, Oliver C. Sitton, Efton Park, J. L. Gaddy

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

Laboratory studies at the University of Missouri-Rolla have demonstrated the feasibility of producing methane by anaerobic digestion of various crop materials, such as grasses and corn stalks. These studies indicate that about 6.0 scf of methane are produced per pound of crop material destroyed. Preliminary design and economic studies of a large methane plant show that the reactors represent the largest cost item and that efforts should be concentrated on defining reaction kinetics and reactor design. This paper discusses various approaches to reactor design. A process to produce 50 M5CFD of methane is described, and the design and economics are …

Frontmatter -- 3rd Annual Conference On Energy 1976, University Of Missouri--Rolla

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

No abstract provided.

An Analysis Of Optimum Loading Conditions For P-N Junction Solar Cells, R. C. Durbin, J. A. Counsil

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

An analysis of the voltage-current characteristics of a p-n junction solar cell yields an expression for the load resistance at which maximum power transfer occurs. Variations in the parameters which affect the maximum power transfer point are discussed. A means of matching the load to the internal solar cell resistance is explained. Application of the matching system to Electrolysis Cells is discussed.

Remote Sensing As A Tool In Assessing The Impact Of Topographical Alterations On The Microclimate, R. A. Sutherland, J. F. Bartholic

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

Results and analyses of remotely sensed data taken from a NASA aircraft are reported. The study uses continuous data taken in the 8-14ym region of the infrared spectrum which is directly related to surface temperature. The analysis is concentrated on the micrometeorological effects of lakes and hills during near freezing conditions. The impetus for the study is an economic one since proper selection of a site for certain freeze susceptible crops, such as citrus, can result in huge savings of energy and resources.

Manpower Programs For Engineers And Technologists In Future Energy Systems, Burns E. Hegler

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

Technically competent personnel are required for the success of future energy programs. To determine this country's educational ability to provide such personnel, a study has been made of the present status and future plans for their education and training. The plans of energy-related governmental, educational, and other organizations have been reviewed, and the uncertainty of objectives, alternative goals, and problems of implementation have been considered. Although the results point to some problem areas, they indicate that the country's educational institutions can provide the manpower for future energy systems once the goals are established. Some conclusions and general recommendations are proposed.

Forecasting As An Aid To Establishing A National Energy Policy, Yildirim Omurtag, Thomas J. Murray

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

This paper points out the importance of obtaining accurate estimates of short and long range energy needs for effective planning. Among the forecasting methods discussed are time series analysis, causal methods, and qualitative methods. Each method is further classified according to its forms and analyzed with respect to its applicability to energy related quantities. Included among the qualitative approaches is the Delphi method which is proposed for energy forecasting to aid in formulating a dynamic national energy policy. After a brief illustration of the essential features of the Delphi process, its possible use in formulating a national energy policy is …

Solar Energy For Drying Shelled Corn And Hay, Mylo A. Hellickson, William H. Peterson, David P. Yexley

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

Investigations of selected types of low-cost, low-temperature rise solar collectors for drying shelled corn and chopped hay were performed in 1974 and 1975. The results indicate that bare plate, solar collectors can be an economically feasible means of providing supplemental heat for agricultural drying operations in South Dakota.

Nuclear Safeguards, Jay O. Hunze

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

Nuclear safeguards Is an Important Issue which bears on the potential usage of nuclear energy as a viable electric power source and an understanding of the Issues and problems Is necessary to resolve this Issue. ERDA has a comprehensive and coordinated program directed toward providing the necessary base, both informational and hardware related, to resolve these issues.

Air Pollution Control Training In Colleges And Universities: A Status Report For The United States And Canada, Harold M. Cota

Civil and Environmental Engineering

The APCA Education and Training Committee surveyed air pollution training at colleges and universities in the United States and Canada in 1975. There were 197 full-time faculty teaching air pollution courses at 75 schools. Graduates from these programs are finding meaningful work in both the public and private sector. Financial support is briefly discussed.

Cross Florida Barge Canal Restudy Report Summary, Department Of The Army Jacksonville District Corp Of Engineers

Waterways and wildlife

The objective of this study was to prepare a Restudy Report including an environmental assessment and analysis, engineering and cost studies, and updated economic studies on various alter natives for the Cross Florida Barge Canal Project. Detailed engineering, economics and environmental results are presented in separate documents and summarized herein. An environmental impact statement was prepared to accompany the Restudy Report. The basic framework for the studies was regional in scope and included baseline conditions as well as future conditions expected with and without the alternatives studied. Study area delineation was based upon the economic , social, and environmental systems …

Communication Processes In The Design And Implementation Of Models, Simulations And Simulation-Games: A Selective Review And Analysis, From The Vantage Point Of Computerized Conferencing, Computerized Conferencing & Communications Center, Julian M. Scher

Computerized Conferencing and Communications Center Reports

Computerized conferencing is a new form of communication which permits a group of individuals, who could be separated in time as well as space, to engage in an interactive dialogue with each other through the convenience of their computer terminals. The software for a computerized conferencing system is designed to keep track of all messages communicated in the system, as well as insure that the various protocols for communication are observed by all.

Our objectives in this report are to examine the communication processes found in the design and implementation of models, simulations and simulation-games, and to identify those areas …

Frequency-Mixing Detection (Fmd) Of Polarization-Modulated Light, R. M.A. Azzam

Electrical Engineering Faculty Publications

When a light beam whose polarization and intensity are weakly modulated at a frequency ω_m passes through a periodic analyzer of frequency ω_a(<ω_m) and the transmitted flux is linearly detected, the resulting total signal S_t consists of two components: (i) a periodic baseband signal S_bb with harmonics of frequencies nω_a (n = 0,1,2,…) and (ii) an amplitude-modulated-carrier signal δS_mc with center (carrier) frequency ω_m and sideband frequencies at ω_m ± nω_a(n = 1,2,…). In this paper we show that the average polarization of the beam is determined …

The Effects Of Optical Path Perturbations During Recording On A Reconstructed Holographic Image, Stevan Israel Feldman

Dissertations

The effects of optical path perturbations occurring during recording on the reconstructed image of a hologram are investigated. It is shown that such variations of optical path are equivalent to conditions of holographic interferometry which can be classified in three categories: 1) object motion alone, 2) film motion alone, and 3) simultaneous film and object motion; all motions are defined with respect to the stationary reference source during the recording of the hologram.

The theory concerning the effects of object motion alone on the radiance distribution of a reconstructed holographic image has already been developed by previous researchers and is …

Investigation And Optimum Design Of The Generalized Second-Order Phase-Locked Loop, William Allen Novick

Dissertations

In this dissertation, a second-order phase-locked loop (PLL) in which the loop filter contains complex zeros is investigated in both its linear and nonlinear modes of operation; prior designs used a filter containing a simple zero on the negative real axis. This "generalized" second-order PLL had been heretofore essentially unexplored.

The basic characteristics of the generalized second-order PLL operating in the linear mode including the open and closed-loop responses and the corresponding root locus were generated and compared against those of the conventional second-order PLL. As in the conventional case, the generalized second-order PLL is found to be unconditionally stable. …