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Test 1002: John Deere 2520 Power Shift, Nebraska Tractor Test Lab

Nebraska Tractor Tests

No abstract provided.

Analysis Of Traffic Loads On Bridges: Report Ii Characteristics Of Traffic On Ohio River Bridges - 1968, Robert L. Lynch

Kentucky Transportation Center Research Report

The recent bridge disaster at Point Pleasant, West Virginia, has renewed concern about the mechanism of material fatigue as a possible cause of catastrophic failure of bridge structures. A reasonable methodology for evaluating the fatigue condition of the highway bridge requires a knowledge of the distribution of traffic loads utilizing the facility during the analysis period. The accuracy of such an analysis is dependent on the accuracies of the input data -- material fatigue properties and traffic characteristics. The more critical of the above parameters, with respect to accuracy, appears to be traffic characteristics. This is especially true of vehicle …

Rheological And Ultimate Strength Properties Of Cohesive Soils, Gordon D. Scott

Kentucky Transportation Center Research Report

In recent years, there have been considerable advances made in rheological theory and its application to various materials. There has not been, however, nearly as much work done toward applying rheology to soil mechanics as the successes of others would seem to indicate. For instance, it has been shown that a variety of stress and deflection problems considering the application of a load by means of an elastic plate to an elastic foundation can be extended to include rate effects through the application of linear viscoelastic theory. Before this theory can be applied to foundation design, however, two questions must …

Computer Specification Of Centrifugal Pump And Motor, Paul David O'Lenick

Theses

The purpose of this thesis is to develop a PORTRAIT computer program for selecting a centrifugal pump and motor driver. This is accomplished by means of generalized data which establishes the speed of the Dump and its power requirement. After selection of the pump, the motor is sized and specified. In addition to determining the pump and motor, the program also sizes the discharge and suction lines and the required control valve. The resulting solution yields the pump design data, motor, line and control valve sizes. From this data utility and relative equipment costs can be estimated.

The Long Term Effects Of Frequent Cropping, Stanley Thomas Smith

Journal of the Department of Agriculture, Western Australia, Series 4

AGRICULTURALLY speaking, few Western Australian soils are more than 50 years old. We have the responsibility of preserving them for farming—not for one man's lifetime, but for centuries.

The aim of this article is to demonstrate that cropping and cultural practices do have some effects on the soil, and that these effects should be considered when choosing a farm rotation.

The Effect Of Sediment Properties Of An Ultrasonic Plane Wave, G. H. Flammer, N. E. Stauffer Jr., E. Y. Liu

Reports

No abstract provided.

Water Quality Telemetry, Final Progress Report, Duard S. Woffinden, Allen D. Kartchner

Reports

Water quality standards are now part of the legal code set up to control water pollution. In order to ascertain that these standards are being met, it is mandatory to monitor any river system over which control must be maintained. For optimum, usefulness, data on the monitored variables should be available on a real time basis at any time throughout the 24-hour day. Remote sampling stations and a telemetry link represent the most practical means of accomplishing this end. A water quality monitoring system utilizing radio telemetry has been developed at the Utah Water Research Laboratory (UWRL). The system consists …

Usu Telemetering Precipitation Gage Network, C. Earl Israelsen, Don L. Griffin

Reports

A network of telemetering precipitation gages is operating in the mountainous areas of northern Utah, western Wyoming, and southern Idaho as part of the Wasatch Weather Modification Project. Approximately 40 individual gages collected and reported data during the 1968-69 winter season from distances up to 130 miles. In addition to the remotely located gages, the system includes an Automatic Readout Console (ARC) at the Utah Water Research Laboratory that is connected by a cable to a translator on top of Mt. Logan. The ARC is the control center for the network, interrogating in a predetermined programmed sequence the remote telemetry …

Influence Of Mountain Groundwater On Streamflow, Bi-Huei Wang, Roland W. Jeppson

Reports

This investigation has determined the quantities of water stored as groundwater in the three watersheds in Utah, Logan River upstream from State Dam, South Fork Ogden River upstream from Huntsville, and Weber River upstream from Oakley. The proportion of the total streamflow contributed from this groundwater storage has been determined from past streamflow records, and the knowledge obtained from the analysis of groundwater contribution to streamflow has been utilized in developing water supply forecasting techniques and procedures. The first phase of the study dealt with theory and methods from separating the groundwater component from the total streamflow hydrograph. The method …

Supplemental Final Report Wasatch Weather Modification Project, Utah Water Research Laboratory

Reports

No abstract provided.

Evaluation Of The Adequacy Of Streamflow Operational Hydrology, Roland W. Jeppson, Calvin G. Clyde

Reports

No abstract provided.

Finite Difference Solutions To Free Jet And Confined Cavity Flows Past Disks With Preliminary Analyses Of The Results, Roland W. Jeppson

Reports

A number of solutions are obtained to ideal axisymmetric flow past cavitating disks for both cases of a free surface jet and flow confined in a constant radius conduit. Finite difference methods are utilized in obtaining the solutions from an inverse formulation which considers the velocity potential, and Stokes’ stream function, as the independent variables and the radial and axial dimensions, r and z, as the dependent variables. The resulting inverse boundary value problem for r, for which the basis solution is obtained, is nonlinear. The solution technique uses a Newton-Raphson iteration to evaluate the implicit finite difference operator at …

State Organizational Patterns For Comprehensive Planning Of Water Resources Development, Daniel H. Hoggan

Reports

No abstract provided.

Snowmelt Simulation, J. Paul Riley, Duane G. Chadwick, Keith O. Eggleston

Reports

The rapid growth in recent years of a variety of demands upon available water resources has lead to an increasing interest in more fundamental approaches to the science of hydrology. Accompanying this growth has been a need for an increased understanding of the snowmelt process. A completely adequate description of the entire physical process of snowmelt under all conditions is not yet available. The complex interrelated and variable nature of the snowmelt processes that occur simultaneously complicate the problem. A preliminary mathematical model of the snowmelt process has been developed in which processes such as pack settlement rates and energy …

Electronic Analog Computer Simulation Of The Paez-Pedraza Region Of Venezuela, J. Paul Riley, V. V. Dhruva Narayana, Kousoum S. Sakhan

Reports

Recently governments and universities in many South American countries have shown considerable interest in a planned and orderly development of available water resources. A case in point is the preliminary study reported in which the problem is approached by utilizing a general mathematical model of the hydrologic system. Specifically, the study involves simulation by means of an electronic analog computer of the hydrology of the Paez-Pedraza region of south western Venezuela. The various processes within the model are linked by the continuity-of-mass principle, which requires a hydrologic balance at all points. The analog computer is ideally suited to the solution …

Analog Computer Simulation Of The Runoff Characteristics Of An Urban Watershed, V. V. Dhruva Narayana, J. Paul Riley, Eugene K. Israelsen

Reports

In the syntheses of hydrograph characteristics of small urban watersheds, the distribution of water among the various phases of the runoff process is attempted by the concept of equivalent rural watershed. The urban parameters considered in the study are percentage impervious cover and characteristic impervious length factor. A mathematical model is developed for the equivalent rural watershed with precipitation as input. The hydrograph of outflow is obtained by chronologically deducting the losses due to interception, infiltration, and depression storages from precipitation and then routing through the watershed storage. This mathematical procedure is programmed on an analog computer and is tested …

Urgent Building Needs, Utah Water Research Laboratory

Reports

No abstract provided.

Optimum Operation Of Desalting Plants As A Supplemental Source Of Safe Yield, Calvin G. Clyde, Wesley H. Blood

Reports

No abstract provided.

Telemetry System Modifications And 1968-69 Operation, Duane G. Chadwick

Reports

A discussion of telemetering system modifications is given, and discussion is presented of system operations for the 1968-69 snow season. A telemetering error analysis has been made for an operational period in February. A log is presented giving station operation periods, and a general summary of operational costs for the 1968-69 operational year is summarized.

A Perspective Of Contemporary Water Planning And Management Problems In Utah, Jay M. Bagley

Reports

I should like to discuss what I consider to be a few major problems Utah faces in connection with water and its development. Time will not permit great detail or breadth of discussion. The points I should like to discuss best can be made by first setting some hydrologic scenery. Actually, although hydrologic considerations provide the central melody to planning for water resources development, there are many socio-politico-legal-economic variations on the theme. My approach will be to remark briefly on thie environment in which today's planning must take place, provide some broad hydrologi guideposts, and with this backdrop select a …

Analog Computer Solution Of The Unsteady Flow Equations And Its Use In Modeling The Surface Runoff Process, Utah Water Research Laboratory

Reports

The flow of water on a watershed is usually unsteady and spatially varied, but can be adequately portrayed by the equations of momentum and continuity, commonly referred to as the unsteady flow equations. Because these equations are quasi-linear, hyperbolic, partial differential equations, they are not easily amenable to solution. Analog computer model~ of surface runoff generally have been based on simplified forms of these equations. As an improvement of those models, an analog computer solution is presented here for the unsteady flow equations. The solution involves the conversion of the partial differential equations in to a differential-difference system, and a …

Abstracts Of The Papers Presented At The Asce Hydraulics Division 17th Annual Specialty Conference, J. J. Leendertse, Robert P. Shubinski, E. L. Bourodimos, Calvin G. Clyde, Harl E. Judd, Dean F. Peterson, Roland W. Jeppson, James H. Milligan

Reports

No abstract provided.

Comparison Of Lagrangian Time Correlations Obtained From Dispersion Experiments And From Space‐Time Correlation Functions, J. M. Rodriguez, Gary Kent Patterson

Chemical and Biochemical Engineering Faculty Research & Creative Works

No Abstracts. Copyright © 1969 American Institute of Chemical Engineers

Dynamic Response Of Circular Plates To Transient And Harmonic Transverse Loads Including The Effect Of Transverse Shear And Rotary Inertia, Perakatte Joseph George

Doctoral Dissertations

"Using an improved theory of plate vibration suggested by R. D. Mindlin which takes into account the effects of transverse shear and rotary inertia, free and forced transverse vibrations of uniform circular plates are studied and the results compared with those obtained using the classical theory of plate vibration. The governing equations are developed in polar coordinates using the equations of elasticity. Frequency equations for axisymmetric and antisymmetric vibrations are derived for solid circular plates under different boundary conditions and for an annular plate rigidly mounted on a shaft. The response of plates to different types of rapidly applied axisymmetric …

A Method For Determining Transient Stability In Power Systems, Charles A. Gross

Doctoral Dissertations

"Given a three phase ac power system consisting of synchronous alternators interconnected by transmission lines and other items of electrical transmission equipment, a method is presented which determines the stability of the system when subjected to a three phase symmetrical fault, and to the subsequent clearing of the fault. It is inherent in the method that an estimation of system stability, assuming an instantaneous clearing of the fault, is available. The critical clearing time is therefore determined. The effect of a speed control loop on the system's largest machine is investigated. The method is applied to two, three, four, and …

Analysis Of The Traveling-Wave Transistor, Vernon Ray Stanley

Doctoral Dissertations

"Transmission lines containing independent and dependent distributed sources are considered and the transfer matrices of various active distributed lines are derived. A method is discussed by which a lossy line can be made lossless by the appropriate choice of distributed sources. A steady-state analysis of the uniform traveling wave transistor is given. Considering the device as an active four port network, the transfer matrix is found in closed form and the power gain, output voltage, and input impedance are found. A computer program is written and the frequency response is given for various values of line parameters and terminations. Finally, …

Grain Boundary Self-Diffusion In Sodium Chloride, Kenneth Ray Riggs

Doctoral Dissertations

"The diffusion of ²²sodium and ³⁶chlorine along tilt and twist grain boundaries in pure and calcium chloride doped sodium chloride bicrystals was investigated. No enhanced diffusion of ²²sodium along the grain boundaries was observed. Between 400°C and 500°C the chlorine grain boundary diffusion parameter, D'Δ, is described by D'Δ = (D'Δ)₀exp (-Q_b/kT), where (D'Δ)₀ is approximately 10⁻⁷ cm³/sec and Qb is 1.15 ± .30 eV. The grain boundary angle, the grain boundary character (tilt or twist), and the calcium chloride concentration appear to have no pronounced effect upon the observed chlorine grain boundary diffusion. The ionic movement …

Microwave Propagation Through Isotropic Inhomogeneous Photoconductive Media, Thomas Van Doren

Doctoral Dissertations

"The electromagnetic field equations for microwave propagation through a rectangular waveguide filled with a lossy, isotropic, linear, inhomogeneous material are derived in matrix form and solved numerically by computer. The theoretical effects of photo-induced conductivity and dielectric constant variations on microwave attenuation, phase shift, and voltage standing wave ratio are plotted for typical examples in the X-band frequency range. The theoretical calculations indicate that a two order-of-magnitude change in the conductivity can produce a 25 db change in the attenuation or a 100 degree change in the angle of the reflection coefficient. The theoretical predictions are verified qualitatively by experiments …

Numerical Inversion Of The Laplace Transformation And The Solution Of The Viscoelastic Wave Equations, Abbas Ali Daneshy

Doctoral Dissertations

"In the numerical inversion of Laplace transform two general techniques of inversion are analyzed; a study of the procedures based on an expansion of f̄(s) by a polynomial in 1/s (Salzer's method) provides accurate results for certain ranges of t. A curvature criterion for the selection of the range of points for polynomial interpolation, and a geometric distribution in this interval markedly improves the range and the degree of accuracy of inversion. The results may be further improved by multiplying f̄(s) by 1/s of 1/s². Other procedures are based on approximation of f̄(t). This investigation includes a general review of …

Signal Distortion In A Regenerative Frequency Divider, Carl Ray Ryan

Doctoral Dissertations

"A regenerative frequency divider can be constructed with one integrated circuit and a single-pole tuned circuit. The divider can be used as a means for reducing the modulation index of either deterministic or random signals. This reduction in modulation index can simplify many signal processing schemes. This technique can be used up to S-band frequencies. The mathematical model of the regenerative frequency divider corresponds very closely to that of a first order Phase Locked Loop (PLL). The loop gain is determined in part by the nonlinear element used in the feedback loop. The loop gain is also proportional to the …