Engineering Commons^™

In Situ Shear Strength Parameters By Dutch Cone Penetration Tests, C. Thomas Gorman, Tommy C. Hopkins, Vincent P. Drnevich

Kentucky Transportation Center Research Report

Dutch cone penetration testing was performed and undisturbed samples were collected at four Kentucky highway sites. Shear strength, as determined by consolidated, undrained triaxial testing of the undisturbed samples, was correlated with friction resistance as measured by the Dutch friction cone. Statistical analysis of all data showed shear strength to be about 80 percent of friction resistance. Recommendations for the use of the Dutch cone penetration test in Kentucky soils were also made.

Design Guide For Bituminous Concrete Pavement Structures, James H. Havens, Robert C. Deen, Herbert F. Southgate

Kentucky Transportation Center Research Report

The proposed design guide includes procedures for estimating design EAL's, CBR, modulus of the asphaltic concrete, and an array of tables and graphs to determine pavement and layer thicknesses.

Stolvac: A Traffic Data System, Donald R. Herd

Kentucky Transportation Center Research Report

The purpose of this study was to design a traffic data inventory system and to develop operating procedures for that system. This report outlines the general design of such a system that will be called STOLVAC (acronym for Speed, Turning movements, Origin destination, Loadometer, Volume, Accident, and Classification data). The report also presents recommendations relating to the development and maintenance of STOLVAC. Staging of the system development is recommended.

Vehicle Noise Survey In Kentucky, Kenneth R. Agent, Rolands L. Rizenbergs

Kentucky Transportation Center Research Report

Individual noise measurements were obtained on 10,500 motor vehicles operating on Kentucky highways. The roadways were selected to represent varied geometric and environmental conditions and posted speed limits. Percentages of automobiles and trucks exceeding a given level of noise were determined. As expected, noise levels of trucks were significantly higher than for automobiles, and larger trucks produced higher noise levels than smaller trucks. For any vehicle type, noise increased with an increase in speed limit.

Recent Developments In The Use Of Precast Concrete Units For Buildings In The United States And Iran, Khosrow Ebadi Farshchi

Dissertations and Theses

The object of this study was to investigate the recent developments in the use of precast prestressed concrete members for buildings in the United States and Iran. In the United States, the study was concerned with developments in the usage of members such as slabs, wall panels, beams and columns. The latest technical and engineering reports, along with personal interviews, were used, and a number of case studies were conducted on recently built structures. The author also studied the newest developments in the precast concrete industry in Iran. A questionnaire was formulated in both Persian (native language of Iran) and …

15th Annual Rocky Mountain Spectroscopy Conference

Rocky Mountain Conference on Magnetic Resonance

Program and abstracts from the 15th annual meeting of the Rocky Mountain Spectroscopy Conference, sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy. Held in Denver, Colorado, August 20-21, 1973.

Symmetry-Forbidden Resonant Raman Scattering In Cu2O, S. P. S. Porto, P. F. Williams

P. F. (Paul Frazer) Williams Publications

We have observed resonant Raman scattering from the two longitudinal branches of the Raman-forbidden F_{1u modes of Cu2O. The agreement between our measured scattering cross section as a function of excitation frequency and a calculated cross section which assumes an intraband Frohlich electron-phonon interaction is good. This represents a quantitative confirmation of the resonant-Raman-scattering theory proposed by Martin.}

Buckling Of Diaphragm-Braced Columns Of Unsymmetrical Sections And Application To Wall Studs Design, Amir Simaan, George Winter, Teoman Peköz

CCFSS Library (1939 - present)

Lateral bracing has a significant effect on increasing the buckling load of compression members. In the case of wall stud construction, such bracing is provided by wallboards directly attached to the stud along its length and results in increasing the load carrying capacity significantly. The objective of this investigation is to study the behavior of singly symmetric sections braced by shear diaphragms and to apply the theoretical findings verified by experimental results to the design of wall studs. In the present investigation the shear rigidity as well as the rotational restraint of the diaphragm are considered. Using an energy approach, …

Stability Analysis Of Slide At Milepost 152.7, I 64, Carter County, Harry F. Girdler, Tommy C. Hopkins

Kentucky Transportation Center Research Report

A visual inspection of a slide near Milepost 153 on I 64 was made April 11, 1972, and reported in a memorandum prepared by B. H. Banks on April 12, 1972. The Division of Research made recommendations for correcting this situation in a memorandum to A. R. Romine on June 30, 1972. These recommendations were based on a limited field investigation and a stability analysis of a proposed berm to be located near Station 3483+00. In a letter dated August 18, 1972, Mr. A. J. Horner of FHWA requested borings be made at the site to establish rock depth and …

An Historical Review Of Oil Spills Along The Maine Coast 1953-1973, Edward H. Shenton

Maine Collection

An Historical Review of Oil Spills Along the Maine Coast 1953-1973

by Edward H. Shenton

Prepared for The Maine State Planning Office, Coastal Planning Group and The Research Institute of the Gulf of Maine (TRIGOM), August, 1973.

TRIGOM Publication No. 3

Contents: Introduction / A Chronology of Significant Oil Spills / A Summary of Biological Impacts / Spill Statistics / Discussion of Results / Conclusions of the Study / Recommendations for Future Research / Appendices

What Is An Airlifter?, Tim Brady

Publications

This article describes the components that make up the Tactical Air Command flight crew, from loadmaster, to flight engineer, to navigator, to copilot, and lastly, to pilot. All together, the crew work in coordination to deliver the goods or the troops. This article was Dr. Brady's last as editor of TAC Attack. Under his two-year leadership, the safety message continued to be heard.

Buckling Of Diaphragm-Braced Columns Of Unsymmetrical Sections And Application To Wall Studs Design, Amir Simaan

CCFSS Library (1939 - present)

No abstract provided.

Component Residential Building Construction, Gary L. Trickey

Graduate Research Papers

To study residential component building as one of the first steps towards a more industrialized method of home construction.

Fast Neutron Effects On Time Delay Occuring In Gallium Arsenide Laser Diodes., James Owen Schroeder

Electrical and Computer Engineering ETDs

A study has been made on the effects of fast neutron irradiation on time delay occurring in diffused GaAs laser diodes operating at 77° K and 300° K. Measurements were performed at 300° K prior to irradiation and thence after successive exposure to neutron irradiation to a maximum of about 1.2 x 10^14 nvt (>10 KeV). At 77° K, measurements were limited to a pre-irradiation characterization and a characterization after the final irradiation. A double acceptor model is used to account for the observed changes in the delay characteristics as a result of both temperature changes and neutron irradiation. …

Explosive Electron Emission And The Characteristics Of High-Current Electron Flow, Robert Kelley Parker

Nuclear Engineering ETDs

Within the past several years, an increasing effort has been concen­trated on the application of high-current, relativistic electron beams to the problem of controlled thermonuclear fusion. Initially, this effort had been impeded by limitations in the high-voltage and pulsed-power technology required to develop pulsed, high-power electron accelerators. These technologies have been developed to a level where powers on the order of 10¹³ watts are now available for time durations of approximately 100 nanoseconds. With the initial limitations removed, the emphasis has more recently been centered on controlling and concentrating these beams to achieve the parameters necessary for fusion experimentation. …

A New Sampling Theorem For Causal (Non-Bandlimited) Functions., Alan Baker Campbell

Electrical and Computer Engineering ETDs

It is shown in this work that whereas any causal function (i.e., any function with a definite starting point) is non-bandlimited and thus would be thought to require an infinite sample rate, there is an infinite class of causal functions (identified as "regionally bandlimited functions" (r.b.f.'s)) for which a finite sample rate is adequate.

An Experimental Study Of Ultrahigh Fluence Oxygen Ion Implantation In Silicon, Charles Burton Fite

Electrical and Computer Engineering ETDs

An investigation was made to determine the feasibility of using ultrahigh fluences of implanted oxygen ions to create a usable oxide layer on silicon for device applications. Previous studies have indicated that SiO₂ can indeed be formed in this manner, but very little work has been reported on the electrical and structural nature of the resulting oxide-silicon interface. Six implants with fluences ranging from 1.25 x 10¹⁷ to 1 x 10¹⁸ (O₂)⁺ /cm² were performed into p-type silicon wafers. The implanted material was then studied to determine how the variables of anneal time, …

Response Of Orthotropic Bridge Decks To Highway Loadings, Harry Morris Rexin

Dissertations and Theses

This thesis documents the fabrication, testing techniques, and response of a plastic scale model of an orthotropic bridge deck. To economically investigate a two-lane steel bridge deck, plastic Acrylic^R was used as a modeling material. Welds were simulated with dichloromethane, a capillary action solvent, and PS-30, a polymerizable cement. Deflections were measured with laboratory dial guages while strains were monitored with strain guages mounted on the deck.

The response of the deck to AASHO vehicle axle loads was compared with a discrete element computer program used to analyze orthotropic bridge decks continuous over flexible supports. Results indicate good correlation …

Problems Of Measurement In The Environmental Field, Harold M. Cota

Civil and Environmental Engineering

No abstract provided.

Process Control Of Activated Sludge Treatment, Richard I. Kermode, Robert W. J. Brett, Kenneth A. Debelak, John J. Davis

KWRRI Research Reports

General feed forward controllers, conforming to standard control modes, have been derived for an activated sludge process. The analysis indicated that the appropriate controllers are proportional control with measurement of substrate flow rate, and derivative control with measurement of inlet substrate concentration, and manipulation of the rate of return sludge by both controllers.

The performance of these controllers was tested by computer simulation of five dynamic aerator models with and without sludge storage, and with two settling basin models. In all cases significant reduction of the maximum exit substrate concentration was achieved. Additional improvement resulted from the use of sludge …

Bulletin - June, 1973, Civil Aviation Medical Association

Browse all Civil Aviation Medical Association Newsletters

A four page newsletter of the Civil Aviation Medical Association. The newsletter provided news about civil aviation medicine and information related to the organization.

Effects Of High Altitude Jet Aircraft On The Stratosphere, Dennis K. Bushnell

Retrospective Theses and Dissertations

This paper presents a review of the basic thermal, chemical and radiation balances existing in the atmosphere and discusses the mechanisms by which jet engine exhaust products can disturb these balances. Possible effects of stratospheric pollution on plant and animal life are discussed. Methods for reducing harmful emissions through engine design modifications are outlined and current successful research programs are surveyed. The SST type aircraft is shown to be a greater threat to the environment than conventional jets because of differences in cruise altitudes. It is concluded that due to the existence of several potential environmental problems associated with contamination …

Remote Sensing Of Earth Resources System Capabilities V.S. Design Constraints, William Howard Grisham

Retrospective Theses and Dissertations

There is new evidence that global earth resources satellite net will be practical. This paper weighs recent advances in remote sensing to pinpoint the dominant constraints. The data and sensor systems interfacing requirements are critically reviewed. It is shown that conventional optics constraints can be relaxed, with the newer systems, based on multi-spectral imagery and statistical processing methods. The most powerful computational methods use algorithms based on a Gaussian assumption for the species vector in feature space, but biases in the imagery limit their efficiency. A rationale is proposed: improving the observational network calibrating efficiency will also improve the photogrammetric …

An Investigation Of A Free Jet At Low Reynolds Numbers, George C. Greene

Mechanical & Aerospace Engineering Theses & Dissertations

This thesis presents a comparison of the measured and calculated flow field properties of a nozzle of unusual design which was used to produce an incompressible, low Reynolds number ]et. The "nozzle" is essentially a porous metal plate which covers the end. of a pipe. Results are presented for nozzle Reynolds numbers from 50 to 1000 with velocities of 100 or 200 ft/sec. The nozzle produces s, uniform velocity profile at nozzle Reynolds numbers well below those at, which conventional contoured nozzles are completely filled with the boundary layer. A Jet mixing analysis based on the boundary layer equations accurately …

Between Pyosis And Pyralidan, Tim Brady

Publications

Some history of the military air base, Pyote (Texas), and its mission after World War II to store and preserve surplus military aircraft. Two famous airplanes were stored there: the Enola Gay, the B-29 used to drop the first atomic bomb on Hiroshima, and the Swoose, the sole surviving B-17D from the Pacific theater during World War II. Both aircraft are now housed at the Smithsonian.

Generalized Feedback Shift Register Pseudorandom Number Algorithm, Theodore Gyle Lewis, W. H. Payne

Electrical and Computer Engineering Faculty Research & Creative Works

The generalized feedback shift register pseudorandom number algorithm has several advantages over all other pseudorandom number generators. These advantages are: (1) it produces multidimensional pseudorandom numbers; (2) it has an arbitrarily long period independent of the word size of the computer on which it is implemented; (3) it is faster than other pseudorandom number generators; (4) the "same" floating-point pseudorandom number sequence is obtained on any machine, that is, the high order mantissa bits of each pseudorandom number agree on all machines— examples are given for IBM 360, Sperry-Rand-Univac 1108, Control Data 6000, and Hewlett-Packard 2100 series computers; (5) it …

Computer-Aided Design Of Light Aircraft To Meet Certain Aerodynamic And Structural Requirements, Joanne Lynn Walsh

Mechanical & Aerospace Engineering Theses & Dissertations

Nonlinear mathematical programming techniques are applied to a particular aircraft design problem, that of determining the maximum range design for light aircraft subject to certain aerodynamic and structural requirements. Search techniques available in an existing nonlinear optimization computer program, AESOP, are applied to the design problem. Seven design variables are used to define the wing dimensions, the wing skin thickness, the cruise velocity, the amount of fuel carried, and the engine horsepower. The influence of different design requirements on the range is observed and discussed.

Adaptive, Differential Pulse-Code Modulation For Speech Processing, Peter Cummiskey

Dissertations

The objective of the research reported here is the design of efficient speech coders that can easily be implemented in integrated circuit hardware. Companding techniques like those introduced by M. R. Winkler, J. A. Greefkes, F. DeJager, A. Tomozawa and H. Kaneko were explored along with a large body of theory concerning the application of linear prediction to speech coding.

The best features of the speech signal to be measured and coded are the overall amplitude, the resonant frequencies and dampings of the vocal cavity and the fundamental frequency of the vocal cord oscillations. Adaptive quantization was used to track …

A Simulation Modeling Approach To Central City Dynamics, Leonard William Schaper Jr.

Dissertations

This dissertation describes a computer simulation model of a central city with emphasis on its application to Newark, New Jersey. The work begins with a review of the Forrester Urban Dynamics Model; the first attempt to simulate the entire system of the city. The objections to this model which have appeared in the literature are discussed, and the model is viewed in the light of other work in the field. A set of guidelines to aid the "second generation" model building effort is developed. The actual construction of a model which attempts to follow these guidelines is described. First, the …

Representation And Characterization Of Thixotropic Fluids, Huei-Hsiung Wang

Dissertations

Thixotropy is a time-dependent rheological behavior of a group of fluids which are characterized by an isothermal reversible breakdown induced by a mechanical disturbance. Based on this definition, a mathematical model of reversible degradation kinetics is set up. Its development leads to two equations which represent quantitatively the hysteresis loop and torque-decay curve. These equations consist of five independent parameters with their physical meanings. These parameters can be used to characterize the properties of thixotropic materials.

The original Weissenberg Rheogoniometer was modified to measure the thixotropic behavior of blood with the step change and the ramboid change of shear rate. …