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Articles 331 - 351 of 351
Full-Text Articles in Engineering
Integrated Numerical Simulation Of Drip Irrigation With Subsurface Drainage, James Ray Hoover
Integrated Numerical Simulation Of Drip Irrigation With Subsurface Drainage, James Ray Hoover
Electronic Theses and Dissertations
A numerical method and model were developed to simulate soil moisture during steady-state and transient flow toward a tile drain. Intermittent application of water by drip irrigation and rainfall were simulated by use of finite difference approximation equations. No known analytical solution for these flow situations exists because of the complex mathematics describing unsaturated flow in the soil. The computer model is based on the electrical resistance network analog. The explicit finite difference equations were solved by the successive over-relaxation method for steady-state flow and by iteration for transient soil moisture flow. The computer program for the model consists of …
Evaluation Of Bi-Level Drainage Theory With A Viscous-Flow Analog, James Marfred Kienholz
Evaluation Of Bi-Level Drainage Theory With A Viscous-Flow Analog, James Marfred Kienholz
Electronic Theses and Dissertations
The primary purpose of this study is to evaluate the validity of this bi-level theory with a viscous-flow analog. Viscous-flow analogs have been used by many investigators in the past to evaluate analytical solution to drainage problems (Bear, 1972). The objectives of this study are: 1. Design and construct a viscous-flow analog for laboratory and classroom use, 2. Test the reliability of existing bi-level drainage theory with the analog, and 3. Provide design data for use in the solution of bi-level drainage problems. The bi-level drainage theory will be graphically presented for design purposes provided the theory is shown to …
The Unsteady Circulation Distribution In Rotors And Its Application To Noise Studies, Assem A. Fathy
The Unsteady Circulation Distribution In Rotors And Its Application To Noise Studies, Assem A. Fathy
Electronic Theses and Dissertations
A new method for the calculation of the unsteady circulation distribution in axial flow compressors was developed. The classical assumption of representing the rotor by a two-dimensional infinite cascade was eliminated. Instead the more realistic case of a radial cascade with blades of finite length was studied. The blades were assumed to be thin and only slightly cambered. The flow was assumed ·to be incompressible and inviscid and the secondary flow effects were neglected. The velocity induced at an arbitrary point of a reference blade due to the bound vortices on the blade under consideration and the other blades and …
Quantification Of Pollutants In Surface Runoff From Agricultural Lands In Brookings County, South Dakota, Leland Lester Harms
Quantification Of Pollutants In Surface Runoff From Agricultural Lands In Brookings County, South Dakota, Leland Lester Harms
Electronic Theses and Dissertations
Surface runoff from snowmelt and rainfall was measured 1n eastern South Dakota from seven sites (7.18 to 18.69 acres) during 1971 and 1972. All sites had single crops which included corn, oats, pasture and hayland. All land was farmed under normal farming conditions. Samples were taken periodically throughout each runoff event, and a single composite sample was made from the individual samples for a particular site. The composite sample represented the entire runoff event. The amount of rainfall and the runoff flow were measured. Determinations on the composite sample included total coliform, fecal coliform, fecal streptococcus, soluble pesticides, specific conductance, …
Experimental Study On Viscoelastic Properties And Fracture Characteristics In Polymers, Debaranjan Mohanty
Experimental Study On Viscoelastic Properties And Fracture Characteristics In Polymers, Debaranjan Mohanty
Electronic Theses and Dissertations
The research reported in this thesis is undertaken with the following objectives:
1. To determine the viscoelastic properties of polymers on creep test under constant load;
2. To determine the internal friction (loss factor) of polymers under periodic loading condition;
3. To determine the delayed time or life time on fracture of the polymer under constant loading ; and
4. To verify the relationship, theoretically predicted, between the time to fracture and the material characteristics of the polymer with experimental observations.
The Role Of Rainfall Impact And Surface Flow In Soil Detachment And Transport, Robert Alan Young
The Role Of Rainfall Impact And Surface Flow In Soil Detachment And Transport, Robert Alan Young
Electronic Theses and Dissertations
Soil erosion caused by rainfall is a very complex physical process. To evaluate the mechanism of erosion so that an assessment can be made of the extent to which it may be controlled necessarily begins with an understanding of the basic fundamental factors involved. The purpose of this study involves the development of an insight of the relative importance of the roles played by various contributors to the erosion process. Particular emphasis is placed on the contribution of rainfall detached soil to total soil loss. Three soil types, Barnes loam, Crofton silt loam and Central sandy loam, were prepared with …
A Simulation Of Sediment Deposit In Open Channels, Tsan-Wen Wang
A Simulation Of Sediment Deposit In Open Channels, Tsan-Wen Wang
Electronic Theses and Dissertations
In this study, two mathematical models have been developed to simulate sediment deposition in open-channel flow; a model based on three characteristic equations and a model based on two characteristic equations. A set of three partial differential equations for one dimensional transient flow with homogeneous density was provided to explain the mechanics of the phenomenon. By the method of characteristics, three partial differential equations were transformed into a set of three ordinary differential equations or a set of two ordinary differential equations by simplification in which the change of sediment layer thickness with respect to distance was assumed to be …
Analysis Of Variation Of River Flow And Water Quality In The White River Basin, Michael Stephen Thompson
Analysis Of Variation Of River Flow And Water Quality In The White River Basin, Michael Stephen Thompson
Electronic Theses and Dissertations
The main objectives of this White River Basin study were to analyze flow variation records, to investigate existing river water quality data as compared with the designated beneficial uses for the basin and to consider the influence of present and future irrigation development. Data were collected from a number of sources and brought together for interpretation with respect to these objectives. The streamflow study utilizes the streamflow records from 10 gaging stations in the White River Basin. It is expected that the results of this investigation may be of assistance to the South Dakota Water Resources Commission and the South …
An Incrementally Distributed Mathematical Model Of A Watershed, Charles Arnold Onstad
An Incrementally Distributed Mathematical Model Of A Watershed, Charles Arnold Onstad
Electronic Theses and Dissertations
The utilization of distributed input parameters enables hydrologists to more adequately cope with watershed management problems. A distributed system aids in evaluating alternative solutions designed to alleviate a problem situation. As a result, the objectives of this study were (1) to develop a hydrological framework delineating the surf ace configuration of a watershed to consider parameter distribution; (2) to develop a model of hydrologic performance of a watershed using existing techniques and amenable to the physical framework; and (3) to demonstrate the versatility of the model using hypothetical data. The model versatility was demonstrated by showing the effects of different …
Experimental Investigation Of Shock Boundary Layer Interaction For Two-Dimensional And Axisymmetric Flow, A. Shawki Zahran
Experimental Investigation Of Shock Boundary Layer Interaction For Two-Dimensional And Axisymmetric Flow, A. Shawki Zahran
Electronic Theses and Dissertations
A supersonic wind-tunnel has been constructed using an 8 inch by 10 inch single stage jet vacuum ejector with a capacity of handling 0.4 lb/sec air at 4 inches Hg absolute suction pressure. A Toepler Schlieren system with 10-inch diameter parabolic mirrors has been set up for flow pattern visualization. The same apparatus was developed to obtain multi-colored views of the flow pattern. That was accomplished by placing an equilateral prism in front of the light source located at the focal plane of the first parabolic mirror. A spectrum was thus produced at the focal plane of the second parabolic …
Computer Simulation Of Unsteady Flow In An Alluvial Channel By The Method Of Characteristics, Dennis Lynn Richards
Computer Simulation Of Unsteady Flow In An Alluvial Channel By The Method Of Characteristics, Dennis Lynn Richards
Electronic Theses and Dissertations
A number of dams have been constructed along alluvial rivers. These dams create reservoirs which serve to collect and store water, usually in large quantity, for use in supplying municipal needs, for supplying power and driving machinery, for furnishing irrigation, and for retaining the flow in time of floods. The characteristics of flow and the sediment-transport capacity of the channel change after these dams have been constructed. One of the major problems then confronting the hydraulic engineer is the rate of reservoir sedimentation and the change in river configuration. A problem of concern is the rapidity of reservoir sedimentation and …
An Evaluation Of An Aerated Lagoon System Treating Combined Dairy And Domestic Wastes During Summer Operation, Douglas M. Skie
An Evaluation Of An Aerated Lagoon System Treating Combined Dairy And Domestic Wastes During Summer Operation, Douglas M. Skie
Electronic Theses and Dissertations
The Water Quality Act of 1965 and the adoption of the subsequent state water quality standards emphasized the general public's concern for the control of water pollution; for it has become the goal of our nation to maintain all American waters in a suitable condition for domestic and industrial supply, for recreation and for other beneficial uses. It is for these reasons that many communities have been faced with the problem of constructing new sewage treatment facilities or expanding present operations. The use of stabilization ponds as a means of providing sewage treatment has been the practice of many small …
Screening Electrocardiograms Using Hotelling's Method Of Principle Components, Edward G. Schwartz
Screening Electrocardiograms Using Hotelling's Method Of Principle Components, Edward G. Schwartz
Electronic Theses and Dissertations
Considerable use is presently being made of computers to classify electrocardiograms (ECGs) into various heart defect categories. An example of such a program is the "Electrocardiographic Analysis Program" developed jointly by the Mayo Clinic and IBM. In one of Dr. Caceres published reports, he tells of using a computer program which involves 5,000 instructions. Dr. Caceres does not say whether this is a commercial program or one of bis own. His description does place this program in the same general category as IBM's. These programs have the common criteria of examining the ECG for the same information that a cardiologist …
Stress Analysis By Photoelastic Methods, Herald K. Palmer
Stress Analysis By Photoelastic Methods, Herald K. Palmer
Electronic Theses and Dissertations
The object of this article is to point out how the principles of photo elasticity may be used as a basis for the analysis of stresses in machine parts. It is also to review the methods and demonstrate the procedure for the determination of the characteristics and values of stresses in the models of the parts studied.
Design Considerations In Food Irrigation, Hans G. Jepson
Design Considerations In Food Irrigation, Hans G. Jepson
Electronic Theses and Dissertations
Flood-irrigation is primarily a system of irrigation which utilizes a part or all of the surface run-off is diverted from contributing watersheds and distributed over the fields by dikes or ditches. Diversion is accomplished through the use of a dam or of dikes if the volume of water diverted is not too great. There are thousands upon thousands of fertile acres throughout the arid and semi-arid regions of the Great Plains which could be materially benefited if bolstered by a little additional rainfall. It is not possible to increase the normal precipitation over the area , but it is possible, …
A Plant Efficiency Survey And Experimental Plant Results Obtained At The Sioux Falls Sewage Treatment Plant, Sioux Falls, S.D., Lowell A. Yost, Hans Jepson
A Plant Efficiency Survey And Experimental Plant Results Obtained At The Sioux Falls Sewage Treatment Plant, Sioux Falls, S.D., Lowell A. Yost, Hans Jepson
Electronic Theses and Dissertations
"Sioux Falls, the largest city in South Dakota is situated on a bend in the Sioux River. The flow of this river ranges from a recorded minimum flow or 9 to a maximum flood flow of 500 cu. ft. per second. As originally designed and built the sewage system emptied into the river at three main outlets. In 1910 the City had a population of approximately 14000 people, and during the next decade its population practically doubled. During this period of growth there was added to the industries of the City a large meat packing plant which has been steadily …
The Effects Of Temperature And Pressure Variation On The Process Of Cooking Foods, Benjamin M. Aldrich
The Effects Of Temperature And Pressure Variation On The Process Of Cooking Foods, Benjamin M. Aldrich
Electronic Theses and Dissertations
It is generally known that water has a definite boiling temperature for each pressure to which its surface is subjected and that wet steam generated in a closed vessel maintains a definite temperature-pressure relation. Under each condition of temperature and pressure the steam contains a fixed amount of available energy stored as heat and called, "Heat Content" the value of which is usually based upon an arbitrary zero fixed a 32 degrees F., the freezing temperature of water under one atmosphere of pressure.
Stress Investigation And Design Methods For Composite Beams Consisting Of Concrete Slabs On Steel I-Beams, Hjalmer T. Person
Stress Investigation And Design Methods For Composite Beams Consisting Of Concrete Slabs On Steel I-Beams, Hjalmer T. Person
Electronic Theses and Dissertations
The term, reinforced concrete, as generally used, is applied to that type of construction in which steel rods are imbedded in concrete members. In these members the steel and concrete are considered to act as a unit and both are assumed to be effective in developing the resisting moment of the beam.
Discrepencies Of Theory As Against Empirical Results Of Critical Speeds Of Circular Cross Sectioned Shafting, Vern Kilpatrick
Discrepencies Of Theory As Against Empirical Results Of Critical Speeds Of Circular Cross Sectioned Shafting, Vern Kilpatrick
Electronic Theses and Dissertations
The scope of this thesis included computations and tests showing the first critical speeds of two shafts each 5/8" dia x 38" long one of C.R.S. and one of hard drawn brass. The purpose was to find and tabulate the discrepancies between the computed values for the critical speeds and the empirical values for critical needs.
A Traffic Survey Of The City Of Sioux Falls, South Dakota, George Everett Thompson
A Traffic Survey Of The City Of Sioux Falls, South Dakota, George Everett Thompson
Electronic Theses and Dissertations
How to control the traffic on the streets of our cities is becoming one of the most important problems of the present day. an urban community depends for its existence upon the transportation facilities both internal and external. The external transportation is necessary for a city's growth because food supplies and raw materials must be brought into the city and the commodities which are produced in the cities must be distributed to other places.
Bridge Survey Practice, R. B. Yule
Bridge Survey Practice, R. B. Yule
Electronic Theses and Dissertations
It is the intention in this paper to outline for general use the information that should be obtained in a survey for a proposed bridge in order that it may be designed with full knowledge of the conditions it must meet satisfactorily in service. The Manuals herein are written for conditions that exist in the Mississippi Basin and particularly the North Central States but will find general application with minor changes.