Digital Commons Network^™

Excitation Requirement For Rectified Output Ac Generators, Richard Thomas Smith

Electrical and Computer Engineering Faculty Research & Creative Works

This paper develops a method for calculating the required dc field current of a three-phase synchronous ac generator for known dc load conditions and machine characteristics. The method is simple to apply and has shown good agreement with test data. The method is of utility for preliminary design and analysis of rectified output alternators, such as may be used in excitation systems of the largest ac generators, space vehicle power applications, or high-power industrial rectification. Copyright © 1971 by The Institute of Electrical and Electronics Engineers, Inc.

On The Longitudinal Impact Of Two, Thin, Viscoelastic Rods, A. G. Behring, R. B. Oetting

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A one-dimensional representation of the distribution of stress and strain resulting from the longitudinal impact of two elastic rods is developed. A form of the "correspondence principle" is then used to obtain series solutions for stress and strain distributions resulting from the longitudinal impact of two rods of a "Maxwell material." Results of the viscoelastic solutions, obtained by use of nondimensional variables, are presented graphically. © 1970 by ASME.

Mass Transfer From Spherical Gas Bubbles And Liquid Droplets Moving Through Power-Law Fluids In The Laminar Flow Regime, Robert M. Wellek, Cheng Chun Huang

Chemical and Biochemical Engineering Faculty Research & Creative Works

Calculated mass transfer coefficients for the continuous phase are presented for internally circulating spheres of a Newtonian fluid traveling through a power-law-type continuous phase in the so-called creeping-flow region. The Nakano and Tien stream functions allow the Sherwood number to be computed as a function of the Peclet number, power-law index, and a viscosity ratio parameter. The Hirose and Moo-Young relation is shown to be a limiting case of this numerical solution. Mass transfer rates increase as the fluids become more pseudoplastic and/or the continuous phase consistency index increases, all other factors held constant. © 1970, American Chemical Society. All …

Effects Of Cold Work In Cold-Formed Steel Structural Members, S. J. Britvec, Alexander Chajes, K. W. Warren, Jairo Uribe, George Winter

CCFSS Library (1939 - present)

No abstract provided.

Some Effects Of Oh Groups On Sodium Silicate Glasses, Mokhtar Sayed Maklad

Doctoral Dissertations

"Glasses of various compositions in the Na₂O-SiO₂ system were prepared with different levels of OH concentration. Phase separation kinetics, thermal expansion, radiation induced optical absorption, and internal friction of these glasses were studied. The increase in OH content in these glasses was found to (a) enhance the rate of phase separation; (b) increase thermal expansion above the glass temperature and change the dilatometric softening temperature in a way that depends on microstructure; (c) increase the radiation induced optical absorption bands associated with positive hole centers and decrease those associated with electron trap centers; and, (d) decrease the low temperature alkali …

Model-Referenced Adaptive Control Of Plants With Noise And Inaccessible State Vector, Donald James Schooley

Doctoral Dissertations

"The problems of process noise, measurement noise, and inaccessible process state vector in the model-referenced system of Shackcloth-Butchart-Parks (SBP) are investigated. Since the system no longer possesses a static equilibrium point, the concept of asymptotic stability does not apply. However, by using Liapunov-like ideas, the error between the plant (process plus controller) and the model is shown to enter a region about the origin if certain bounds are known. A possible technique for reducing the size of this region is to feedback a function of the error into the plant's input. Several methods of circumventing the inaccessible state vector problem …

Probe Detection Of Microwave Perturbation In A Magnetoplasma, Show-Ran Peter Wang

Masters Theses

"When a microwave signal with a frequency near the electron upper hybrid resonance is applied to a magnetoplasma, it will excite the plasma. The perturbation of plasma can be detected by using Langmuir probes. The particular plasma used in this experiment is an argon discharge type and the density is relatively low (n~10⁸ cm⁻³). The electron temperature is about 7000º K. Because a magnetic field is applied to the plasma, it is necessary to use the probe theory in a magnetic field to calculate the electron number density from the electron temperature. In order to determine the electron upper hybrid …

Time-Domain Analysis And Measurement Techniques For Distributed Rc Structures. Ii. Impulse Measurement Techniques, Robert C. Peirson, Edward C. Bertnolli

Electrical and Computer Engineering Faculty Research & Creative Works

Transient analysis for uniform RC structures is considered in this paper. A method is presented for determining the parameters of such structures. The measurements are obtained using impulse excitations in open-circuit and short-circuit configurations. The theoretical results obtained predict fairly the experimental results. © 1969 The American Institute of Physics.

Cation Grain-Boundary Diffusion In Sodium Chloride, K. R. Riggs, Manfred Wuttig

Materials Science and Engineering Faculty Research & Creative Works

No abstract provided.

Public Hearings - Closing The Communications Gap, James G. Apple

Kentucky's Annual Forum on Transportation

No abstract provided.

References [1969], Kentucky Transportation Center

Kentucky's Annual Forum on Transportation

No abstract provided.

Long Span, Prestressed Concrete Bridge Construction, H. J. Stockinger

Kentucky's Annual Forum on Transportation

No abstract provided.

A Liquid Extraction Column With Reciprocated Wire Mesh Packing, Robert M. Wellek, M. Uran Ozsoy, J. J. Carr, Dudley Thompson, Thomas V. Konkle

Chemical and Biochemical Engineering Faculty Research & Creative Works

In a new type of pulsating, liquid extractor, pulsating energy is added to the counter currently flowing liquid streams by a stainless-steel wire mesh packing which is reciprocated vertically in a 3-inch i.d. extraction column. The mass transfer performance and flooding characteristics are studied as a function of the frequency and amplitude of reciprocation, the total solvent and feed throughputs, and choice of phase dispersion. The benzene-HAc-H₂O and MIBK-HAcH₂O systems were used. Extraction data for the benzene system were correlated in terms of a dimensionless pulse velocity group. Operating throughputs are significantly higher than those achieved …

The Static And Dynamic Balance Of Rotating Mechanisms In The Automobile, Joel E. Tjelmeland

Graduate Research Papers

What are the physics and mechanics involved in the static and dynamic balance of rotating mechanisms in the automobile? To what degree is balance necessary in the various mechanisms? What machines are available for balancing the various mechanisms? What are the skills involved in the balance of these mechanisms? How can the materials available best be organized into a unit which can be used in the industrial arts power and automotive programs?

Front Matter, University Of Missouri--Rolla

Symposia on Turbulence in Liquids

No abstract provided.

Industrial Arts Research Methods, Clinton E. Langstraat

Graduate Research Papers

This report has been compiled as one of the culminating activities of 33:292 Industrial Arts Research Methods. This paper can be considered as a written record of the students' and instructor's efforts in establishing further guidelines for work in 33:270, and related activities. Consequently, the report is not highly technical in nature and the number of citations is considerably less than may be found in a typical report written for graduate credit.

However, it is the opinion of the writer that some valuable information has been recorded and it is his hope that some future graduate student may find it …

A Computer Procedure For The Identification Of Beam, Spring, And Damping Parameters Of An N-Mass Model Using Transient Data, Lynn A. Christiansen

Theses and Dissertations

If, however, one could develop a model for a given physical system, that is a model which can be described in terms of lumped masses, springs beams, and dashpots and then identify the parameter simply by processing acceleration data such as that obtained from drop tests or shaker tests, the task of identification is greatly simplified.

Optimization Of Physical Properties Of Hydraulic Cushion Cells For Vehicle Impact Restraint, William Evans Hughes

Theses and Dissertations

In recent years, the United States has witnessed a vast expansion of its internal highway system. Concurrently the number of vehicles has increased as has the average yearly milage per vehicle. Unfortunately, along with increased vehicle use there has been an alarming increase in annual loss of life and property due to traffic accidents. Statistics verify that the modem freeway systems greatly reduce dangerous head on collisions but the rate of accidents due to collisions with fixed objects in or near the roadway has increased almost 50 percent in the past thirty years.^1 In 1966, about 13>300 deaths were …

A Preliminary Evaluation Of Mounds To Divert Wayward Vehicles Away From Rigid Obstructions, Gordon R. Garner, J. B. Venable

Kentucky Transportation Center Research Report

In the summer of 1965, the first fatality report involving an interstate median bridge pier in Kentucky caused concern among state and national officials for the safety of motorists who perchance or otherwise enter upon a collision course toward an unprotected bridge pier. A consensus of opinion seemed to indicate that some form of attenuation or deflection device was necessary.

Early innovations employed various short guardrail configurations to deflect wayward vehicles from the piers. The use of small, short sections has since evolved until present methods include surrounding the bridge pier with several hundred feet of guardrail, including ramped-end treatment …

An Experimental Study Of A Type Of Vortex Sink Rate Sensors, Rao V. Arimilli

Mechanical & Aerospace Engineering Theses & Dissertations

In order to study the flow field in the sink region of a vortex Sink Rate Sensor, an experimental study was initiated .. Using two probes, one for the total pressure measurements and the other for the static pressure measurements, data was collected for two flow rates, various rates of rotation and at various points in the sink region of the flow. For the sensor (coupler inside diameter 5.0 inches and height 0.50 inches) with slenderness parameter of unity, four important conclusions were drawn from the data. At a given location in the flow field the magnitude of the tangential …

Diffusion Coefficients Of D-Glucose In Aqueous Carboxymethylcellulose And Carboxypolymethylene Solutions, A. L. Huang, S. V. Desai, Robert M. Wellek

Chemical and Biochemical Engineering Faculty Research & Creative Works

A micro interferometric method was used to determine pseudo-binary, molecular diffusion coefficients for diffusion of D-glucose in aqueous carboxymethylcellulose (CMC) and aqueous carboxypolymethylene (Carbopol) solutions. An initial solute concentration of about 9 wt. % D-glucose in the aqueous polymer solutions was used. The polymer concentrations for the CMC solutions ranged from 1.2 to 2.2 wt. % and for the Carbopol solutions from 0.18 to 0.28 wt. %. Diffusion coefficients were determined as a function of reduced solute concentration, both with and without the effect of solution volume change during diffusion being considered. © 1969, American Chemical Society. All rights reserved.

Hypothetical Liquid Fugacity Coefficients, Douglas F. Patterson

Theses

The object of this thesis was to derive values of the hypothetical liquid fugacity coefficient of carbon dioxide for various temperatures and pressures. Most of the temperatures studied were above the critical temperature of carbon dioxide and thus carbon dioxide could not truly exist as a pure liquid. Hence the prefix "hypothetical" was used to acknowledge this apparent discrepancy. Carbon dioxide was purposely chosen for this reason. Also,the necessary data for carbon dioxide were generally more available than for any other normally gaseous solute.

The hypothetical liquid fugacity coefficients were derived from the published binary vapor-liquid equilibrium data of carbon …

The Effect Of Flow Rate And L/D Ratio On The Frequency Response Of Water Fluidized Beds, Arnold Ludke

Theses

In this investigation, the dynamics of a water fluidized bed with varying L/D ratio and flow rate were analyzed both theoretically and experimentally, and the results of the two were compared.

The theoretical analysis was based on the standard method of Laplace transforms and transfer function synthesis.

The experimental investigation was conducted using standard frequency response techniques.

The mathematical model used consisted of a series of non-interacting perfectly mixed cells plus a distance velocity lag.

At low flow rates (3 to 6 times minimum fluidization velocity) the experimental data (in the form of Bode plots) were found to be in …

A New Technique For The Solution Of Free Convection Mass Transfer Boundary Value Problems, James Lewis Putman

Theses

Free convection mass transfer in boundary layer flow due to density difference in an isothermal model was studied. Previous work was examined and a quasilinearization technique was chosen to linearize the system of nonlinear partial differential equations resulting from the boundary layer continuity, momentum, and diffusion equations. This system of linear ordinary differential equations was solved by a computer program utilizing an iterative Gauss Jordan matrix solution technique. Results are presented and the convergence rate of the variables is plotted for each variable as a function of the distance from the boundary layer.

Correlation Of 1/F Noise With Threshold Drift In Mosfet's, John Peter Rooney

Theses

A brief review of the fundamentals of MOSFET's is given. A correlation between threshold drift and surface states is made, with a following correlation between surface states and 1/f noise. It therefore follows that MOSFET's with a high 1/f noise level will drift more than those with a low level of 1/f noise. Experiments were carried out to show this effect, but no clear cut conclusions can be drawn from the experimental work.

The 1966 Eruption Of Izalco Volcano, El Salvador, William I. Rose, Richard E. Stoiber

Department of Geological and Mining Engineering and Sciences Publications

During October–November 1966 900,000 m³ of olivine basalt flowed from the flank of Izalco volcano, El Salvador. The total heat energy was approximately 10¹⁵ calories. No measurable changes in gravity occurred at stations on the active cone between August 1964 and August 1967. In the summit crater fumaroles have surface temperatures as high as 540°C. The cooling rate of these fumaroles was 18°C/yr before the eruption and 45°C/yr after. Yearly temperature cycles due to wet and dry seasons are superimposed on the general cooling trend. The rate of gas emission at four fumaroles in November 1967 was 86 …

Accidents At Median Crossovers, Gordon R. Garner

Kentucky Transportation Center Research Report

Safety improvements are often controversial subjects, especially when the subject is highways. Judgments must be made weighing lives and injuries against the hard realities of financing the construction and maintenance of highway systems. Median crossovers on rural and urban freeways and expressways are controversial design features. State police and maintenance forces claim that median crossovers are necessary and essential for their work and that more frequent location of crossovers is desirable. Engineers involved with highway safety maintain that crossovers create accidents, are not necessary, and should be eliminated. When working on an accident study evaluating median type, it became obvious …

A Rheological Equation Of State For Blood At Low Shear Rates, Anatoly Dritschilo

Theses

In this work a new rheological equation of state is presented and its application to blood is studied. The equation considered is a linear combination of Newtonian and non-Newtonian contributions to the apparent viscosity. The general form of the equation is

 T_ij =-(A + Be^{-1/C|(.5)Δi/j:Δj/i|1/2})Δij

Data from the literature were used to test the equation by generating curves of measured torque (T/L) versus applied shear rate (Ω) that would characterize the behavior of blood at all red cell concentrations and all shear rates in the Gilinson, Dauwalter and Merrill viscometer. The constants for the equation were …

Financing The Nuclear Fuel Requirements Of Public Utilities, Peter A. Lewis

Theses

A major portion of new electric generating capacity will be nuclear powered. The change to nuclear power will require large outlays of capital not required with conventional fuels to finance nuclear fuel inventories. Nuclear fuel financing requirements are unique because nuclear fuel is not consumed in the same manner as conventional fuels. Financing has not been a problem to date because nuclear fuel can be obtained only through lease from the Atomic Energy Commission. This arrangement will be terminated by June 30, 1973 and from that date on all nuclear fuel must be privately owned. Electric utilities have shown an …

The Irish Plumbing And Heating Engineer, May 1969 (Complete Issue)

Building Services Engineering

No abstract provided.