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High Discharge Rate Characteristics Of Nickel-Cadmium Batteries For Pulse Load Filtering, Gregory M. Gearing, Michael B. Cimino, David H. Fritts, John F. Leonard, Anthony J. Terzuoli Jr.

Faculty Publications

Several tests of specially fabricated nickel-cadmium batteries having circular disk type electrodes were considered. These batteries were evaluated as filter elements between a constant current power supply and a five hertz pulsed load demanding approximately twice the power supply current during the load on portion of the cycle. Short tests lasting 10,000 cycles were conducted at up to a 21 C rate and an equivalent energy density of over 40 Joules per pound. In addition, two batteries were subjected to 10⁷ charge/discharge cycles, one at a 6.5 C rate and the other at a 13 C rate. Assuming an …

Minimum Probability Of Electron-Hole Pair Generation By Blackbody Radiation, Cheng-Hsiao Wu

Electrical and Computer Engineering Faculty Research & Creative Works

Using the small-perturbation assumption that all the useful work is in the form of electron-hole pairs when photons from a blackbody radiation source are incident on a quantum device, we derive the minimum probability of generation of one or more pairs of electron holes. Using the Planck radiation formula for the solar spectrum at 6000 K and for the quantum device at 300 K, this minimum probability is about 0.8 at low photon frequency and approaches the limiting value of 0.95 at high frequency. Its relation to maximum efficiency of a quantum device is discussed.

Analyses Of Quasi-Isotropic Composite Plates Under Quasi-Static Point Loads Simulating Low-Velocity Impact Phenomena, Ajit Dhundiraj Kelkar

Mechanical & Aerospace Engineering Theses & Dissertations

Composite laminates have high strength to density ratios that make them attractive for use in aircraft structures. However, the damage tolerance of these materials is limited because they have very low ultimate strains, no plastic deformation range, and no usable strength in the thickness direction. These limitations are very obvious when laminates are subjected to impact loads. Due to these impact loads, laminates suffer visible and invisible damage. To improve the material performance in impact requires a better understanding of the deformation and damage mechanics under impact type loads.

In thin composite laminates, the first level of visible damage occurs …

Analog Computer Simulation With Automatic Scaling By Digital Computer, Mark Anthony Motter

Electrical & Computer Engineering Theses & Dissertations

A computer-aided design approach for the simplification of analog computer simulation is presented. The simulation configuration consists of an EAI 2000 analog computer with serial communications link to a PDP — 11/24 digital computer. Under control of the PDP-11, the analog simulations are realized with appropriate time and magnitude scaling which adjusts the range of the simulation coefficients and prevents overloads of the analog components. The analog computer hardware configuration accommodates both stable plants up to eighth order and closed-loop systems up to tenth order. Cascade compensation is provided for the closed-loop systems.

The plant may be described by either …

Removing Fluoride From Drinking Water By Organic Polymers, Eleni Davou Achilleos

Civil & Environmental Engineering Theses & Dissertations

Fluoride is a substance that can provide beneficial or detrimental effects depending on the total amount ingested. Naturally occurring high fluoride concentrations exist in many drinking water supplies. The fluoride removal methods developed in the past have been found to be either impractical and/or not cost effective.

The purpose of this study was to determine whether organic polymers can effectively remove fluoride. The water used in this study contained naturally occurring fluoride concentrations between 4.5 to 5.5 mg/1 and it was collected from the City of Franklin, Virginia, water supply system. Laboratory jar test procedures, which simulated a conventional water …

Color Display Of Vowel Spectra As A Training Aid For The Deaf, Amir Jalali Jagharghi

Electrical & Computer Engineering Theses & Dissertations

The objective of this research was to develop a transformation for mapping speech parameters to color parameter. This transformation is done in real-time, and the resulting color parameter are continuously displayed on a color monitor. This visual speech display is to be used as a speech articulation training aid for the deaf. The conversion of speech acoustic signals into speech parameter was accomplished using special -purpose electronics. The real-time conversion of speech parameter to display parameter was controlled by an 8086/8088 microprocessor operating in an S-100 bus structure. The coefficients of the Karhunen-Loeve series expansion of speech power spectra were …

The Unification And Decomposition Of Processing Structures Using Lattice Theoretic Methods, David L. Livingston

Electrical & Computer Engineering Theses & Dissertations

The purpose of this dissertation is to demonstrate that lattice theoretic methods can be used to decompose and unify computational structures over a variety of processing systems. The unification arguments provide a better understanding of the intricacies of the development of processing system decomposition. Since abstract algebraic techniques are used, the decomposition process is systematized which makes it conducive to the use of computers as tools for decomposition. A general algorithm using the lattice theoretic method is developed to examine the structures and therefore decomposition properties of integer and polynomial rings. Two fundamental representations, the Sino-correspondence and the weighted radix …

Investigation Of Pre-Detection Signal Processing Of Pseudonoise Communication Signals In The Presence Of Additive White Gaussian Noise And Cw And Bursty Interference, Israel Mayk

Dissertations

By comparison to conventional communication systems, spread-spectrum systems are known to be less affected by interference because of their large dimensionality in signal space. Nevertheless, significant performance degradation is experienced when large interference exists in a few or even one signal coordinates. In this case, interference reduction techniques are also known to provide additional processing gain. A novel class of pseudonoise (PN) invariant algorithms is derived to reduce the impact of interference and restore much of the structure of PN signals received in the presence of interference and noise. A PN signal received by a pre-detection signal process (PDSP) implementing …

The Mean Return Time To A State For A Markov Chain Representing In Telephone Conversations, M Luhanga

Tanzania Journal of Engineering and Technology (TJET)

The mean return time to a state for a Markov chain representing N off-hook telephone conversations can be obtained by using ergodic flow rates [1] or renewal theory [2]. In this paper it is shown that the same result may be obtained by using no more knowledge of stochastic processes than the solution of time-homogeneous Chapman-Kolmogorov equations.

An Electro Hydrodynamic Study Of The Negative Corona Electric Wind, Henry Thadei Kadete

Tanzania Journal of Engineering and Technology (TJET)

The velocity of corona generated electric wind is measured. From the velocity profile mass movement and electrokinetic conversion efficiencies are deduced. High speed schlieren photographs illustrate the form of the velocity distribution function as well as its high degree of turbulence.

Simple Graphic Routines Ease Drawing Of Artwork For The Fabrication Of Microstrip Lines, H Mgombelo

Tanzania Journal of Engineering and Technology (TJET)

A method which uses simple graphic routines available to general computer users for drawing diagrams intended to be reproduced on printed circuit boards (PCB's) is presented. Experimental verifications for the created microchip lines are reported.

Dismal Science Meets Dismal Subject: The (Mal)Practice Of Nuclear Power Economics, Charles Komanoff

New England Journal of Public Policy

Electric utilities, reactor designers and builders, and the federal government have badly underestimated the costs of new nuclear power plants over the past fifteen years. Although not all of the increases were readily predictable, particularly those caused by rapid general inflation, nuclear advocates failed to foresee most of the sixfold growth in real costs resulting from new reactors' greater complexity, scope, and regulatory surveillance.

This review recounts the methods used by nuclear power proponents to convince policymakers, the public, and themselves that new nuclear plants would be competitive with other energy sources, long after conclusive contrary evidence was available. It …

Identification Of Defect Centers In Hg1-XCdXTe Using Their Energy Ievel Composition Dependence, Charles W. Myles, P. F. Williams, R. A. Chapman, E. G. Bylander

P. F. (Paul Frazer) Williams Publications

We have extended the Kobayashi, Sankey, and Dow [Phys. Rev. B 25,6367 (1982)] theory of deep levels in Hg_1-xCd_xTe to include (vacancy, impurity) nearest-neighbor pairs. In qualitative agreement with the results obtained by these workers for isolated point defects, we find that the composition dependences (dE /dx) of the defect energy levels associated with such complexes depend on the site occupied by the impurity atom. Furthermore, we find that the composition dependences of some of the defect levels produced by such a complex are very different than the dE /dx of levels associated with …

Operating Under New Laws Pertaining To Mineral Development On Indian Lands, B. Reid Haltom

Public Lands Mineral Leasing: Issues and Directions (Summer Conference, June 10-11)

89 pages.

Contains 8 attachments:

1) Indian Mineral Development Act of 1982, Public Law 97-382 - Dec. 22, 1982.

2) Proposed BIA Regulations, 25 C.F.R. 225 and 211, Federal Register, Vol. 48, No. 134, Tuesday, July 12, 1983.

3) Billings Area Office Procedures.

4) Flow Chart.

5) Oil and Gas Exploration Joint Venture Agreement.

6) Federal Oil and Gas Royalty Management Act of 1982, Public Law 97-451 [H.R. 5121], January 12, 1983.

7) 30 C.F.R., Part 210, 212, 217, 218, 219, 228, 229, 241, 243, Federal Register, Vol. 49, No. 185, Friday, September 21, 1984.

8) 43 C.F.R., Part 3160, …

Quantification Of Indian Rights: Problems Of Proof, Harry R. Sachse

The Federal Impact on State Water Rights (Summer Conference, June 11-13)

32 pages.

Diligence Requirements Under The Federal Coal Leasing Amendments Act Of 1975, Gail L. Wurtzler

Public Lands Mineral Leasing: Issues and Directions (Summer Conference, June 10-11)

51 pages.

Contains references.

Readjustment Of Federal Coal Leases, Marilyn S. Kite

Public Lands Mineral Leasing: Issues and Directions (Summer Conference, June 10-11)

19 pages.

Contains references.

Getting The Coal Leasing Program Back On Track: The Linowes Commission And Beyond, Sandra L. Blackstone

Public Lands Mineral Leasing: Issues and Directions (Summer Conference, June 10-11)

37 pages.

Contains 2 pages of references.

Leases For Other Minerals: Recent Developments, Thomas F. Cope

Public Lands Mineral Leasing: Issues and Directions (Summer Conference, June 10-11)

14 pages.

Contains references.

State And Local Regulation Affecting Public Lands Mineral Lease Activities: What Are The Limits?, Lawrence J. Macdonnell

Public Lands Mineral Leasing: Issues and Directions (Summer Conference, June 10-11)

27 pages.

Contains references.

The Federal Coal Leasing Program, John Latz

Public Lands Mineral Leasing: Issues and Directions (Summer Conference, June 10-11)

22 pages (includes 1 illustration and 1 map).

Contains 3 pages of references.

Pitfalls In Federal Oil And Gas Leasing Practice, Terry N. Fiske

Public Lands Mineral Leasing: Issues and Directions (Summer Conference, June 10-11)

13 pages.

Contains references.

Royalty Management I: Current Status, Robert E. Boldt

Public Lands Mineral Leasing: Issues and Directions (Summer Conference, June 10-11)

2 pages.

Environmental Considerations In Public Lands Mineral Leasing And Development I, Karin P. Sheldon

Public Lands Mineral Leasing: Issues and Directions (Summer Conference, June 10-11)

18 pages.

Contains 2 pages of references.

Environmental Considerations In Public Lands Mineral Leasing And Development Ii, Jerome C. Muys, John F. Shepherd, Susan L. Smith

Public Lands Mineral Leasing: Issues and Directions (Summer Conference, June 10-11)

62 pages.

Contains 6 attachments.

Lands Available For Mineral Leasing, John R. Little, Jr.

Public Lands Mineral Leasing: Issues and Directions (Summer Conference, June 10-11)

14 pages.

Contains references.

Federal Royalty Management On Federal Onshore And Indian Lands: Industry Concerns, R. Carol Harvey

Public Lands Mineral Leasing: Issues and Directions (Summer Conference, June 10-11)

68 pages.

Contains references.

Contains 8 appendices.

Agenda: Public Lands Mineral Leasing: Issues And Directions, University Of Colorado Boulder. Natural Resources Law Center

Public Lands Mineral Leasing: Issues and Directions (Summer Conference, June 10-11)

University of Colorado School of Law professor Lawrence J. MacDonnell served as the conference organizer and as a member of the faculty.

Federal leasing programs, especially for oil and gas and coal, have been undergoing important changes in recent years. This conference will provide an overview and an update for those involved in public lands mineral development. Significant new issues also will be addressed.

Current Developments In Public Lands Administration, Lawrence G. Mcbride

Public Lands Mineral Leasing: Issues and Directions (Summer Conference, June 10-11)

24 pages.