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Articles 189991 - 190020 of 196445

Full-Text Articles in Engineering

A Three-Dimensional Mathematical Simulator Of Multiphase Systems In A Petroleum Reservoir, Leonard Koederitz Jan 1970

A Three-Dimensional Mathematical Simulator Of Multiphase Systems In A Petroleum Reservoir, Leonard Koederitz

Doctoral Dissertations

"A generalized digital analysis for calculating three phase, three dimensional flow in reservoirs is developed. The computerized mathematical model is applicable to depletion drive, gas injection, water injection, and/or aquifer drive systems with modifications specific to the simulation criterion of that type of drive and includes fluid compressibility effects, gravity drainage and capillary pressure. The simulation allows arbitrary consideration of reservoir heterogeneity, geometry, well locations and rates of production. An innovation to the alternating direction technique for linear differential equations discussed by Brian is developed and employed in order to render the method of solution applicable to non-linear differential equations. …


An Investigation Of The Stiffness Of Shafts With Integral Disks, Richard King Riley Jan 1970

An Investigation Of The Stiffness Of Shafts With Integral Disks, Richard King Riley

Doctoral Dissertations

"The results of an investigation of the effect of an integral disk on the torsional elastic stiffness of an axisymmetric shaft are presented. Various configurations of disk diameters and widths on a shaft of specified diameter were investigated, using a finite element method of calculation verified by experimentation. The finite element method is presented for the elastic solution of a general axisymmetric body under all possible axisymmetric load conditions. The axisymmetric body is idealized as an assemblage of triangular cross-sectioned torii representing both the normal and shear properties. The elastic stiffness is used to obtain the equilibrium equations of the …


An Investigation Of Nucleate And Film Boiling Heat Transfer From Copper Spheres, William David Hardin Jan 1970

An Investigation Of Nucleate And Film Boiling Heat Transfer From Copper Spheres, William David Hardin

Doctoral Dissertations

"This study consisted primarily of a laboratory investigation involving nucleate and film boiling heat transfer from copper spheres with saturated liquid nitrogen at atmospheric pressure. An initial study was directed towards obtaining reproducible boiling heat flux versus ΔT curves in the nucleate boiling region from surface conditions created by single and/or multiple glass bead peenings. The variables of bead size, nozzle line operating pressure, and distance a copper surface should be placed from the nozzle outlet were checked. The results indicated that a final peening of the surface with 0.0017-0.0035 inch diameter glass beads, a nozzle line pressure of approximately …


Anodic Dissolution Of Zinc In Potassium Iodide-Potassium Iodate Solutions, Chi-Chiu Yao Jan 1970

Anodic Dissolution Of Zinc In Potassium Iodide-Potassium Iodate Solutions, Chi-Chiu Yao

Doctoral Dissertations

"The anodic dissolution of Zn was studied in KI-KIO₃ solutions at 25ºC. In I⁻ solutions, it was found that the apparent valence of Zn ions going into solution is approximately two. Smaller values are obtained in IO₃⁻ solutions, with the most pronounced changes occurring in the higher concentrations. An empirical equation is derived relating the apparent valence (or anode efficiency) to the current density and concentrations of IO₃⁻ and I⁻. An anodic dissolution mechanism is proposed"--Abstract, page 1.


Simulation Of A Gas Storage Reservoir With Leakage By A Two-Dimensional Layered Mathematical Model, Steven William Ohnimus Jan 1970

Simulation Of A Gas Storage Reservoir With Leakage By A Two-Dimensional Layered Mathematical Model, Steven William Ohnimus

Doctoral Dissertations

"A generalized mathematical model was developed for two-dimensional compressible fluid flow accounting for the effects of relative permeability capillary pressure, and gravity drainage in addition to the reservoir properties of rock heterogenity and reservoir geometry. The generalized model developed was applied to an aquifer gas storage reservoir in which vertical leakage occurred from the main reservoir to two adjacent overlaying zones. The experimental results of Thomas, et al. were utilized in applying the model to gas storage injection/withdrawal periods yielding reasonable results for the three layers"--Abstract, page ii.


Ionization Of Air Produced By Strong Shocks, Howard Sajon Joyner Jan 1970

Ionization Of Air Produced By Strong Shocks, Howard Sajon Joyner

Doctoral Dissertations

"This dissertation provides theoretical predictions along with experimental results for electron concentrations behind a shock as a function of Mach number over a range from 11 to 20 using a combustion driven shock tube operating in air. These theoretical predictions represent an upper bound for chemical equilibrium. The model for air was 78.0880% nitrogen, 20.949% oxygen, 0.0300% carbon dioxide, 0 .9300% argon, 0.0025%neon, and 0.0005% helium. Also the theory of a double diaphragm shock tube with corresponding pressure ratio vs. Mach number relationships is provided. A computor [sic] program using iterative techniques for a succinct presentation covering the modifications and …


The Deformation Mechanisms In Sublimed Magnesium Under Cyclic Loading, Babu Narian Thakur Jan 1970

The Deformation Mechanisms In Sublimed Magnesium Under Cyclic Loading, Babu Narian Thakur

Doctoral Dissertations

"A detailed study of the deformation processes in sublimed magnesium under reverse bending fatigue in air at room temperature has been undertaken utilizing the light, scanning and transmission electron microscopy. The Principal deformation modes are the basal slip and {10Ī2} twinning. The proportion of twinning increases markedly with the increasing stress level and the number of cycles. The evidence for cross slip is seen on the basal slip bands. The extrusions are seen not only along the basal slip lines but also along the {10Ī2} twin boundaries. In the later stages of fatigue, the extrusions chip off producing a notch …


The Time-Dependent Transport Of Monoenergetic Neutron In Plane Geometry With Delayed Neutron Production, Nelson S. Demuth Jr. Dec 1969

The Time-Dependent Transport Of Monoenergetic Neutron In Plane Geometry With Delayed Neutron Production, Nelson S. Demuth Jr.

Nuclear Engineering ETDs

The initial-value problem for the transport of monoenergetic neutrons in slab geometry with delayed neutron production is studied using numerical methods based on the analysis of Kaper. The eigenvalues and eigenfunctions of the transport operator are found by numerical solution of the equations which result from application of the normal mode expansion method. The residual terms in this form of the solution of the initial-value problem are evaluated by direct numerical integrations on the (complex) resolvent set of the transport operator. The results obtained in this study are compared with the results from the method of matched asymptotic expansions.


Time-Domain Analysis And Measurement Techniques For Distributed Rc Structures. Ii. Impulse Measurement Techniques, Robert C. Peirson, Edward C. Bertnolli Dec 1969

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 Dec 1969

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

Materials Science and Engineering Faculty Research & Creative Works

No abstract provided.


An Investigation Of Core-Strengths Of A Portland Cement Concrete Pavement, James H. Havens Dec 1969

An Investigation Of Core-Strengths Of A Portland Cement Concrete Pavement, James H. Havens

Kentucky Transportation Center Research Report

This investigation concerns observed differences between the strengths of molded cylinder and beam specimens and the strength of concrete in situ. The specific project is a section of I 64 in Rowan County [I 64-6(15)130]. The paving was done between August 19 and September 27, 1968. Cylinder specimens molded on the project were tested after they had cured 28 days. Beam specimens were tested before they had cured 14 days. Those test results were "normal". However, cores taken to measure thickness of the pavement were subsequently tested for strength; and the pavement cores, even though older when tested, yielded strengths …


Equal Employment Opportunity, B. B. Meyers Nov 1969

Equal Employment Opportunity, B. B. Meyers

Kentucky's Annual Forum on Transportation

No abstract provided.


Traffic Operations During Maintenance, William G. Galloway Nov 1969

Traffic Operations During Maintenance, William G. Galloway

Kentucky's Annual Forum on Transportation

No abstract provided.


Public Hearings - Closing The Communications Gap, James G. Apple Nov 1969

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

Kentucky's Annual Forum on Transportation

No abstract provided.


Relocation Assistance, Carl H. Bradley Nov 1969

Relocation Assistance, Carl H. Bradley

Kentucky's Annual Forum on Transportation

No abstract provided.


References [1969], Kentucky Transportation Center Nov 1969

References [1969], Kentucky Transportation Center

Kentucky's Annual Forum on Transportation

No abstract provided.


Lane Distribution, G. R. Garner Nov 1969

Lane Distribution, G. R. Garner

Kentucky's Annual Forum on Transportation

No abstract provided.


Effects Of Auto-Utility Trailers, B. S. Siria Nov 1969

Effects Of Auto-Utility Trailers, B. S. Siria

Kentucky's Annual Forum on Transportation

No abstract provided.


Evaluation Of The Function Of Models In Interchange Design, C. F. Davis, J. A. Dearinger Nov 1969

Evaluation Of The Function Of Models In Interchange Design, C. F. Davis, J. A. Dearinger

Kentucky's Annual Forum on Transportation

No abstract provided.


Median Design And Accident History, G. R. Garner Nov 1969

Median Design And Accident History, G. R. Garner

Kentucky's Annual Forum on Transportation

No abstract provided.


Impact Attenuating And Redirectionalizing Safety Barriers, Gordon R. Garner, Bruce S. Siria Nov 1969

Impact Attenuating And Redirectionalizing Safety Barriers, Gordon R. Garner, Bruce S. Siria

Kentucky's Annual Forum on Transportation

No abstract provided.


Accidents At Median Crossovers, G. R. Garner Nov 1969

Accidents At Median Crossovers, G. R. Garner

Kentucky's Annual Forum on Transportation

No abstract provided.


An Evaluation Of The Effectiveness Of Televised, Locally Oriented Driver Re-Education, J. W. Hutchinson Nov 1969

An Evaluation Of The Effectiveness Of Televised, Locally Oriented Driver Re-Education, J. W. Hutchinson

Kentucky's Annual Forum on Transportation

No abstract provided.


Grooving Of Pavements, G. R. Garner Nov 1969

Grooving Of Pavements, G. R. Garner

Kentucky's Annual Forum on Transportation

No abstract provided.


Pavement Marking Systems, J. H. Havens Nov 1969

Pavement Marking Systems, J. H. Havens

Kentucky's Annual Forum on Transportation

No abstract provided.


Structural Paints, J. H. Havens Nov 1969

Structural Paints, J. H. Havens

Kentucky's Annual Forum on Transportation

No abstract provided.


Blow-Ups And Cracking Of Pcc Pavements, J. H. Havens Nov 1969

Blow-Ups And Cracking Of Pcc Pavements, J. H. Havens

Kentucky's Annual Forum on Transportation

No abstract provided.


Road Roughness, R. L. Rizenbergs Nov 1969

Road Roughness, R. L. Rizenbergs

Kentucky's Annual Forum on Transportation

No abstract provided.


Stability Of A Guided Air Cushion Vehicle, Don J. Wood Nov 1969

Stability Of A Guided Air Cushion Vehicle, Don J. Wood

Kentucky's Annual Forum on Transportation

No abstract provided.


Pavement Surface Hydrodynamic Drainage, J. W. Hutchinson Nov 1969

Pavement Surface Hydrodynamic Drainage, J. W. Hutchinson

Kentucky's Annual Forum on Transportation

No abstract provided.