Engineering Commons^™

Trends Of Suspended Sediments In The Upper Rio Grande Basin In New Mexico., Vernon W. Norman

Civil Engineering ETDs

Man has been troubled by the sediment in streams for many thousands of years. Any information toward understanding the nature of this sediment should benefit man in his endeavor to cope with it. Available information was used to determine if trends in the annual quantities of suspended sediment exist in the Upper Rio Grande Bas in in New Mexico. The study revealed that trends do exist and quantitative values were determined for the different trend periods. An effort was made to determine the most probable cause or causes for the changes that occurred in the trends. Eighteen years of suspended …

Low-Cycle Fatigue Damage In Structures Subjected To Earthquake Excitation., Iyadurai Kasiraj

Civil Engineering ETDs

The object of this investigation is to ascertain the possibility of having low-cycle fatigue failure of structures resulting from earthquake loads. In addition, a comparison is made between criteria of failure for maximum displacement and low-cycle fatigue.

The relationship between applied load, deflection and maximum strain in a shear type simple frame with rectangular columns have been analyzed for reversals of loadings. Two interrelated hysteresis loops, namely load-maximum strain curve and deflection-maximum strain curve, are proposed to give the upper-bound safety of the structure having columns with an average wide-flange (WF) section. These hysteresis loops are utilized for finding the …

Test 975: Minneapolis-Moline G1000 Vista (Lpg), Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF TEST REPORT GENERAL CONDITIONS East tractor is a production model equipped for common usage. Power consuming accessories can be disconnected only when it is convenient for the operator to do so in practice. Additional weight can be added as ballast if the manufacturer regularly supplies it for sale. The static tire loads and the inflation pressures muse conform to recommendations in the Tire Standards published by the Society of Automotive Engineers. PREPARATION FOR PERFORMANCE RUNS The engine crank case is drained and refilled with a measured amount of new oil conforming to specifications in the operator’s manual. The …

A Technique For Determining Transistor Spall Thresholds., Herbert L. Floyd Jr.

Electrical and Computer Engineering ETDs

ABSTRACT

The purpose of the work described in this report was to develop a technique for determining the mechanical robustness of small electronic components when subjected to short duration stress waves. Techniques employed by other experimenters., which include flyer­plate impaction and pulsed-electron deposition., are difficult to control and to analyze. The procedure described herein overcomes these difficulties by restricting the variables that control accuracy to those which can be precisely measured.

The wave equation was derived and solved for deformable bodies subjected to unidimensional strain. In addition to providing insight into the dependence of high-tensile stress es on stress -wave …

Test 974: Minneapolis-Moline G1000 Vista (Diesel), Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF TEST REPORT GENERAL CONDITIONS East tractor is a production model equipped for common usage. Power consuming accessories can be disconnected only when it is convenient for the operator to do so in practice. Additional weight can be added as ballast if the manufacturer regularly supplies it for sale. The static tire loads and the inflation pressures muse conform to recommendations in the Tire Standards published by the Society of Automotive Engineers. PREPARATION FOR PERFORMANCE RUNS The engine crank case is drained and refilled with a measured amount of new oil conforming to specifications in the operator’s manual. The …

Test 973: Ford 8000 (Diesel), Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF TEST REPORT GENERAL CONDITIONS East tractor is a production model equipped for common usage. Power consuming accessories can be disconnected only when it is convenient for the operator to do so in practice. Additional weight can be added as ballast if the manufacturer regularly supplies it for sale. The static tire loads and the inflation pressures muse conform to recommendations in the Tire Standards published by the Society of Automotive Engineers. PREPARATION FOR PERFORMANCE RUNS The engine crank case is drained and refilled with a measured amount of new oil conforming to specifications in the operator’s manual. The …

Investigation Of Implicit Methods For Solution Of The Fourier Equation, Kjell Steinar Gundersen

Theses and Dissertations

In recent years there has been an extensive development of finite difference techniques for solution of the transient heat conduction equation due to the availability of high-speed digital computers. It is the purpose of this paper to investigate and compare several implicit methods for the solution of the Fourier equation with regards to truncation error, round-off error and computer time which probably are among the most important factors to be considered in choosing a method.

Hot-Mix Coal-Tar Concrete Pavement And Multiple, Coal-Tar Seals On Shoulders, Robert L. Florence

Kentucky Transportation Center Research Report

It is proposed to construct an experimental section of roadway, 6.6 miles in length, using coal-tar concrete for base and surface, and to use multiple, coal-tar seals (3 seals) with coverstone on the shoulders. A section of pavement, 5.1 miles in length, incorporating the same structural thicknesses and types of courses but containing normal asphaltic binders, to be constructed on the same route will be designated for comparison and control purposes. The use of the coal-tar will be in compliance with Section 201(e) of the Appalachian Regional Development Acts of 1965.

An Experimental Study Of The Effects Of Welding On Cold-Worked And On Heat-Treated Steels As They Correlate To Tempering And Jominy Data, Kiran Patwari

Theses and Dissertations

Since Bernandos of Russia in 1887 applied an electric arc to weld metals, welding has become an important method of fabrication in industry. The ever increasing use of welding on a still widening variety of materials demands m ore and m ore understanding of the basic mechanisms of welding.

Transition From Laminar To Turbulent Flow For Dilute Guar Gum Solutions, Martin L. Palmer

Theses and Dissertations

Solutions of many natural and synthetic polymers have been found to reduce turbulent friction losses in flow through pipes. The basic mechanism causing these reductions is not entirely understood although two general theories have been advanced.

Design Of An Automatically Controlled-Feed, Constant Current Arc Generating Machine For Consumable Electrodes, Dhansukh J. Chauhan

Theses and Dissertations

Good welding research requires accurate control of the variables involved,to achieve consistent results. The variables involved in arc welding are of the dependent and independent type. Control of the independent variables such as arc current, arc voltage and welding velocity is necessary to control the independent variables such as penetration, electrode consumption rate, etc. The purpose of this thesis was to design, develop and test an automatic welding machine which controlled the above variables within the limits required for welding research.

Design Of An Apparatus For Study Of Stress Versus Strain As A Function Of Strain Rate In Plastics, Ashok B. Choksi

Theses and Dissertations

As new materials are developed, it is essential to study their mechanical properties experimentally. It is easy to find properties like ultimate strength, yield strength, hardness, etc., using standard techniques. It is not possible to observe the tensile behavior of materials at high strain rates using standard equipment. Plastics are often subjected to tensile loads at various rates of loading, such as when they are used to absorb impact.

The Enrichment Of Hydro-Carbon Fuel By Aluminum Powder In An Open-Hearth Furnace, Rick Sung-Tao Lee

Theses and Dissertations

The objective of this thesis was to study theoretically the enrichment of hydrocarbon fuels with aluminum powder for an open-hearth furnace.

Electric Arc Welding Of Gray Cast Iron Without Preheating, Ramon Prestwich

Theses and Dissertations

Cast irons are iron-carbon alloys with greater than 1.7% carbon. Although white, malleable and ductile cast irons are used extensively for casting work, this study is concerned with only the gray cast irons.

Study Of Tensile Stress Versus Strain Characteristics Of Vinyl Plastic At Various Temperatures As A Function Of Strain Rate, Jitendra T. Parikh

Theses and Dissertations

The purpose of this thesis was to study the tensile-stress versus strain characteristics of vinyl plastic at various temperatures as a function of strain rate.

The Gaussian Mode In Optical Resonators With A Radial Gain Profile, Lee W. Casperson, Amon Yariv

Electrical and Computer Engineering Faculty Publications and Presentations

The dependence of the parameters of the Gaussian mode in laser resonators on the properties of the medium in the cavity is studied. Experimental verification of the theoretical results is presented. It is found that the modes in a high‐gain laser may differ widely from the usual free space resonator results. Also, resonator configurations which in free space are unstable may, with a suitable medium, support low‐loss Gaussian modes.

A Similarity Model For Flow In A Turbulent Boundary Layer, Earl Clark Lemmon

Theses and Dissertations

One of the basic goals in engineering is to generate models which will provide a means for analytically predicting observed phenomenon. Such a model is often modified several times to obtain better results. The purpose of this study was to generate a model for an equilibrium turbulent boundary layer for steady flow over a flat plate and compare the results obtained by using the model with experimental data. Part of the objective was to also suggest ways in which the model could be modified to obtain better results.

Developing Turbulent Flow In An Annulus, Dwight H. Kelly

Theses and Dissertations

Turbulent flows are encountered in nearly every case where fluid motion is involved. Since turbulent flow through relatively short annular sections occurs frequently in practical applications, e.g., flow through heat exchangers, axial flow turbomachinery and jet aircraft engines, there is a need for detailed information on this subject.

Irrigation Demand In The Utah Lake Drainage Area The Role Of Irrigation Efficiency, Hiro Mizue

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The effect of irrigation efficiency upon the water demand for agricultural purposes in the Utah Lake drainage area has been evaluated in this study . Irrigation demand is the quantity of water at the supply source necessary to satisfy crop water requirements, taking into account irrigation efficiency.

The Utah Lake drainage area was divided into hydrologic subareas and districts to facilitate analysis. The demand, surplus, and deficit quantities for each area was determined. The computations were made using constant mean quantities. Within a given area, the diverted water was assumed to be applied uniformly to satisfy agricultural crop demands, and …

A Study Of Free Surface And Viscous Effects On Simulated Rough Open Channel Beds, Julian B. Andersen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

An experiment was designed to eliminate the free surface from simulated naturally roughened open channel beds from which results were compared to data with a free surface from another study. All other pertinent variables were held constant. From this comparison, a relationship was established for the additional energy loss due to the presence of a free surface in the flow over these channel beds.
P = 0.23 - 0.28 D/D₂₅
where P is the proportion that the channel conductance coefficient (C/g^1/2) is reduced due to presence of a free surface, D is the flow depth, K_{25 …}

Study Of Sheltered Evaporation In Colombia, Guillermo Pardo-Bonilla

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Equations, tables, and graphs for estimating evaporation from sheltered evaporimeters were developed, based on data from 20 stations in Colombia.

Computer programs and plottings were the basic tools to work out the equations. The form of the simplified final equation is

Ev = kC_VPDC_T

in which

• Ev is the evaporation in millimeters per day
• K is a constant
• C_VPD is the vapor pressure deficit coefficient
• C_T is the temperature coefficient

Statistical parameters were determined to compare the measured evaporation with the Christiansen-Guillen formula and the newly developed formulas.

Streamflow Forecasting For The Logan And Blacksmith Fork Rivers In Northern Utah, Kenneth A. Mangelson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Accurate streamflow forecasts have been recognized as being important by water users and others whose occupations and pursuits depend upon the supply of water from snow fed streams.

The streamflow forecasting equations for the important predictive periods, in particular the April through September and the May through September total flows, were developed in this study for both the Logan and Blacksmith Fork Rivers.

Multiple linear regress ion was used as a mathematical model in determining the streamflow forecasting equations. A correlation analysis was used to determine the importance of the variables used in the mathematical model. The results of this …

Design Criteria For Usu Stilling Basin Pipe Flow To Open Channels, Chi-Yuan Wei

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Criterion have been developed in this study for designing a stilling basin to serve as a transition from pipe flow to open channel flow. The purpose of the structure is to prevent erosion in an open channel. The unsteadiness, or smoothness, of the water surface in the model basin was used as the criterion for evaluating the effectiveness of the structure for energy dissipation.

The introduction of a short-pipe energy dissipater in the stilling basin has proven effective in dissipating energy. The stilling basin was designed for a fully submerged pipe outlet. The inflow pipe and the dissipator pipe were …

Automation In The Design Of Asynchronous Sequential Circuits, Richard T. Smith, James H. Tracey, W. L. Schoeffel, G. K. Maki

Electrical and Computer Engineering Faculty Research & Creative Works

Sequential switching circuits are commonly classified as being either synchronous or asynchronous. Clock pulses synchronize the operations of the synchronous circuit. The operation of an asynchronous circuit is usually assumed to be independent of such clocks. The operating speed of an asynchronous circuit is thus limited only by basic device speed. One disadvantage of asynchronous circuit design has been the complexity of the synthesis procedures for large circuits.

Test 972: Oliver 1950-T Diesel 4wd, Nebraska Tractor Test Lab

Nebraska Tractor Tests

No abstract provided.

Test 970: International Farmall 856 (Diesel), Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF TEST REPORT GENERAL CONDITIONS East tractor is a production model equipped for common usage. Power consuming accessories can be disconnected only when it is convenient for the operator to do so in practice. Additional weight can be added as ballast if the manufacturer regularly supplies it for sale. The static tire loads and the inflation pressures muse conform to recommendations in the Tire Standards published by the Society of Automotive Engineers. PREPARATION FOR PERFORMANCE RUNS The engine crank case is drained and refilled with a measured amount of new oil conforming to specifications in the operator’s manual. The …

Test 971: International Farmall 1256 Turbo (Diesel), Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF TEST REPORT GENERAL CONDITIONS East tractor is a production model equipped for common usage. Power consuming accessories can be disconnected only when it is convenient for the operator to do so in practice. Additional weight can be added as ballast if the manufacturer regularly supplies it for sale. The static tire loads and the inflation pressures muse conform to recommendations in the Tire Standards published by the Society of Automotive Engineers. PREPARATION FOR PERFORMANCE RUNS The engine crank case is drained and refilled with a measured amount of new oil conforming to specifications in the operator’s manual. The …

Ptimal Feedback Control Of The Radioactive Voltage Standard, David William Braudaway

Electrical and Computer Engineering ETDs

The quest for new and different techniques of establishing and maintaining the electrical values is continual Among the techniques desired are those for producing highly predictable sources of voltage. Described in this dissertation is a working device developed around one such technique, the research done to define the system and the synthesis of the automatic control which makes it practical. In this system, the reproducibility of the voltage output is derived from the predictability of the decay of a radioactive heat source.

Problems In Structural Diaphragm Bracing 1. Beams Continuously Braced By Diaphragms 2. I-Section Columns Braced By Girts And A Diaphragm, T. V. S. R. Apparao, S. J. Errera, Gordon P. Fisher

CCFSS Library (1939 - present)

Shear-resistant light-gage metal diaphragms can be very effective in increasing the load carrying capacity of beams continuously braced by diaphragms, or of columns braced by girts which in turn are braced by diaphragms, if proper connections are made between the individual elements. In this thesis, behavior of diaphragm-braced I-beams, channel beams, and Z-beams under uniform moments, and the behavior of axially loaded I-section columns braced by girts which in turn are braced by diaphragms are investigated.

Load-deflection relationships of diaphragm-braced beams are obtained taking into consideration the initial imperfections of the beams and using the equilibrium method. Critical moments of …

Structural Behavior Of Small-Scale Steel Models, William A. Litle, David C. Foster, Duke Oakes, Philip A. Falcone, Richard B. Reimer

CCFSS Library (1939 - present)

No abstract provided.