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Articles 16051 - 16080 of 18627
Full-Text Articles in Entire DC Network
A Photoelastic Study Of The Stresses Around An Underground Opening And Its Support System, Alphonse C. Van Besien
A Photoelastic Study Of The Stresses Around An Underground Opening And Its Support System, Alphonse C. Van Besien
Masters Theses
"The stress conditions around openings in rock have long been of interest to the field of rock mechanics. The purpose of this investigation was to determine the stress distribution around an opening with a rib and wall-plate support system. A photoelastic model of the opening (a modified horse-shoe section) was loaded in the centrifuge to determine the effect of body loading. Both the tangential stress and the stress within the rock bench, due to the opening, were determined. The stress conditions within the bench were examined using simulated ribs and a loading frame. Application of the data is discussed, as …
A Study Of Low-Cost Heat Exchangers For Desalination, Chin-Tsai Lin
A Study Of Low-Cost Heat Exchangers For Desalination, Chin-Tsai Lin
Masters Theses
"This investigation was proposed to search for simple and inexpensive but effective heat exchangers for the recovery of heat in water desalination by evaporation through non-wettable porous membranes. Aluminum was chosen as the material for constructing the heat exchangers. Various fluted arrangements and one plate type arrangement were chosen to increase heat transfer coefficients and conserve material. Equations correlating the heat transfer coefficients to temperatures and flow rates have been suggested for estimating the overall heat transfer coefficient at different conditions. The results of economic calculations indicate that the cost per unit transfer area of the exchangers in this investigation …
A Study On Load Transfer Of Model Friction Piles, Richard Milton Franke
A Study On Load Transfer Of Model Friction Piles, Richard Milton Franke
Masters Theses
"Previous investigations concerned with disturbance of soft clay by driving displacement piles are summarized. The initiation of excess pore water pressures due to pile driving, and mechanisms of load transfer are also described, along with the applicapability of model pile testing in analysis of the various phenomena. Load tests were conducted on assorted sizes of model friction piles embedded in sedimented soil samples with consisted of a silt and clay mixture. Pilot holes of various diameters were cut in the samples. A theoretical load distribution curve was used to calculate the load transferred to the soil as a function of …
Design And Use Of A Universal Logic Circuit, Mahendrakumar Punjalal Shah
Design And Use Of A Universal Logic Circuit, Mahendrakumar Punjalal Shah
Masters Theses
"Yau and Tang have designed universal logic circuits (ULC's) of three variables with 8 I/O pins. They assumed that only one variable was available as a free input variable in its true and complementary form, the others were available as fixed input variables and the circuit generated true and complementary outputs. Their design required 22 I/O pins for a four-variable ULC, constructed from three variables ULCs. This paper decrived [sic] an algorithm for determining the input-pin connections, directly from the K-map of a given output function, for any n-variable ULC. Forslund and Waxman have designed a three-variable ULC using the …
Internal Friction Of Phase Separated Glasses, Scot Walter Taylor
Internal Friction Of Phase Separated Glasses, Scot Walter Taylor
Masters Theses
"The large internal friction peak observed in a 10Li₂O·10Na₂O·80SiO₂ glass was studied as a function of the degree of phase separation. Transmission electron microscopy was used to evaluate the type and degree of phase separation. No observable changes in the temperature position or height of the internal friction peak were observed at successive stages of phase separation. Phase separation of a mixed alkali borosilicate glass also produced no changes in the internal friction peaks. Phase separation is not considered responsible for the large internal friction peak observed in mixed alkali glasses"--Abstract, page ii.
The Effect Of Small Additions Of Niobium Upon The Corrosion Rates And Electrochemical Potentials Of Iron In Hcl, Hf, And H₂So₄, Richard Lee Jones
The Effect Of Small Additions Of Niobium Upon The Corrosion Rates And Electrochemical Potentials Of Iron In Hcl, Hf, And H₂So₄, Richard Lee Jones
Masters Theses
"The valence of niobium ions going into solution was determined by dissolving the metal in hot HF and measuring the volume of hydrogen evolved. The corrosion rates of Nb, NbHx, Fe and Fe - Nb alloys were determined in various concentrations of NCl, H₂SO₄ and HF. The Fe and Fe - Nb alloy samples were made by using powder metallurgy techniques. It was found that a metal skin was produced on the surface of iron corrosion samples if the carbon content of the surface layer was lower than that of the core of the sample. The lower carbon …
Apparatus And Techniques For The Plane Wave Analysis Of Acoustic Filters, Victor Hugo Simon
Apparatus And Techniques For The Plane Wave Analysis Of Acoustic Filters, Victor Hugo Simon
Masters Theses
"This thesis describes a method for determining the reflection and transmission characteristics of acoustic filters under static (i.e. no flow) conditions. These characteristics are obtained by the combination of linear plane wave acoustic theory with a sequential experimental procedure. The experimental data necessary for the calculation of the reflection characteristics were obtained from measurements made on the inlet side of the filter with a standing wave tube apparatus. In order to calculate the transmission characteristics of the filter, the standing wave measurements were augmented with measurements taken on both the inlet and outlet side of the filter. This was accomplished …
Plastic Analysis Of Beam - Columns, Ning-Cheng Tsao
Plastic Analysis Of Beam - Columns, Ning-Cheng Tsao
Masters Theses
"The results of an analytical study of the inelastic deformation of a wide-flange steel beam-column are presented. Emphasis has been placed on the influence of axial thrust on the pinned-end beam-column subjected to equal end moments with opposite direction. For this type of beam-column behavior, the relationship between the applied moment, axial load, and resultant curvature for the region in the plastic range has been studied in this investigation"--Abstract, page ii.
The Influence Of Organic Matter On Shear Strength Of A Cohesive Soil, Kamran Rezvan
The Influence Of Organic Matter On Shear Strength Of A Cohesive Soil, Kamran Rezvan
Masters Theses
"The shearing properties of an organic A̲ horizon of Bryce clay were studied and compared with the properties of the same soil treated with hydrogen peroxide. The treatment was to remove the organic matter and isolate it as a variable. Tests were performed on artificially sedimented samples of the untreated, 75 percent untreated, 50 percent untreated, 25 percent untreated, and the treated soil. The effective stress failure envelopes were found to be higher for the untreated soil than that of the treated. The elastic deformation, however, was larger for the untreated samples. The pore water pressure development due to shearing …
Determination Of Distillation Efficiencies For The Water-Methanol-Acetone System, Chorng Shyong Wang
Determination Of Distillation Efficiencies For The Water-Methanol-Acetone System, Chorng Shyong Wang
Masters Theses
"A pilot-scale, eight-plate, bubble-cap distillation tower with a multi-point temperature recorder and automatic sampling device was used to obtain operating data on temperatures and liquid phase compositions for distillation efficiency studies. The tower was run with a single feed, a total condenser, and a partial reboiler. At steady state, as indicated by constant temperatures, samples were taken and later analyzed by gas chromatography. A digital program was developed to calculate component efficiencies on each plate according to Holland's modified Murphree plate efficiency, utilizing the operating data, and reflux rate, the input and output flows and compositions, and vapor-liquid equilibrium data. …
Study Of Diagnosability Of Binary Address Decoders, Girishchandra Mahendrakumar Gandhi
Study Of Diagnosability Of Binary Address Decoders, Girishchandra Mahendrakumar Gandhi
Masters Theses
"This paper studies the diagnosability of various types of binary address decoders. An attempt is made to develop a theory of diagnosis for logical faults that might occur in these logic nets. The developed theory is used to analyze these logic nets for various input combinations. Finally, the derivation of optimum diagnostic test sequences is considered"--Abstract, Page i.
Investigation Of Free Convection Heat Transfer From An Inclined Flat Plate, Phairojna Sang-Urai
Investigation Of Free Convection Heat Transfer From An Inclined Flat Plate, Phairojna Sang-Urai
Masters Theses
"The experimental investigation was conducted to determine temperature distribution and convective heat transfer coefficients in terms of Nusselt number for an inclined heated flat plate in air. The heated surface of the aluminum flat plate was set facing upward and moved through seven positions from the vertical to the horizontal. The investigation shows that the local Nusselt number can be predicted by Kiekus's solution within 12 per cent for inclination angles from the vertical through 75° from the vertical. In the case of the vertical position, Eckert's solution gives a better prediction. For the horizontal position the results show good …
Application Of Approximate Transmission Matrices To Describe Transverse Beam Vibrations, Ranjit Kumar Roy
Application Of Approximate Transmission Matrices To Describe Transverse Beam Vibrations, Ranjit Kumar Roy
Masters Theses
"This paper is a report of an investigation of an approximate method for finding the principal mode frequency roots for beams in transverse vibration. The method utilizes approximate transmission matrices obtained by a power series expansion of the basic differential equation which governs the transmission matrix. Investigation has been carried out to examine the efficiency of the method in producing the first several normal mode frequency roots. This has been achieved by applying the method to several uniform and non-uniform beams and comparing the results with the exact solutions. The technique has further been applied to non-uniform beams of tapered …
Design, Construction, And Initial Experiments With High Hydrostatic Pressure Extrusion Device, Edward Moniz Jorge
Design, Construction, And Initial Experiments With High Hydrostatic Pressure Extrusion Device, Edward Moniz Jorge
Masters Theses
"The purpose of this study was to design and operate equipment with which the study of polymer extrusion would be possible at hydrostatic pressures up to 50,000 psi. By hydrostatic pressure is meant the pressure of the region of the extrudate. A study of the effects of back pressure on the extrusion of silicone gum was attempted--Abstract, Page ii.
The Incorporation Of Oxygen-18 Into Oxindole Acid By Cells Of Hygrophorous Conicus, William Green Allen
The Incorporation Of Oxygen-18 Into Oxindole Acid By Cells Of Hygrophorous Conicus, William Green Allen
Masters Theses
"To understand the mechanism of a biological oxidation in which oxygen is incorporated into a substrate, it is necessary to determine the origin of the incorporated oxygen. The objective of this investigation was to determine the origin of the oxygen atom incorporated into indoleacetic acid (IAA) by the IAA oxidase of Hygrophorous conicus through the use of oxygen-18. To determine the source of the oxygen atom incorporated into IAA it is necessary to incubate H. conicus cells with tryptamine or IAA in the presence of ¹⁸O₂ and H₂¹⁶O in one case and ¹⁶O₂ and H₂¹⁸O in another. An examination of …
The Influence Of Several Factors On The Rate Of Secondary Compression Of Soil, William Joel Green
The Influence Of Several Factors On The Rate Of Secondary Compression Of Soil, William Joel Green
Masters Theses
"This research program has been undertaken to study the influence of load increment ratio, temperature, and sample thickness on Cα (rate of secondary consolidation) for a high organic content and low organic content soil. Consolidation equipment was designed to produce constant temperatures both above and below ambient, and to accommodate both 3/4 and 1 1/2 inch thick samples. Samples were molded into oedometer rings at the liquid limit. It was found that Cα was independent of the sample thickness and load increment ratio for both the high organic and low organic soils. The influence of temperature on Cα was found …
Telecommunications System Design Considerations For Advanced Logistic Spacecraft, James Myron Romberg
Telecommunications System Design Considerations For Advanced Logistic Spacecraft, James Myron Romberg
Masters Theses
"The telecommunications system design goals and functional requirements for an advanced logistic spacecraft are presented qualitatively. Advanced equipment and techniques that meet these system requirements and goals, that are within the state-of-the-art and that are believed to be economically feasible, are enumerated and described. System emphasis is on unification to minimize RF links and antenna subsystems, and on use of functional redundancy to assure satisfactory performance of critical telecommunication functions. The interaction of the telecommunications system design and the spacecraft mechanical, environmental, electrical, and operational interfaces are described in qualitative and quantitative terms. A practical spectrum of system interface characteristics …
A Study Of A Lead Mining Waste Water Pollution Problem, William Earl Anderson Jr.
A Study Of A Lead Mining Waste Water Pollution Problem, William Earl Anderson Jr.
Masters Theses
"The waste water from the Fletcher Mine of the St. Joseph Lead Company was producing large algal growths in Bee Fork Creek. A field and laboratory study was conducted to determine the characteristics of the waste, find a method of determining the pollutional materials contained in the waste, study the undesirable algal growths, and develop and evaluate a practical, inexpensive, and effective pollution abatement method. Laboratory studies included analytical analysis of the waste, flotation reagent analysis, a microscopic study of the algal growths, algal growth studies, and heavy metal analysis of the algal growths. Field work comprised: a study of …
A Five-Spot Waterflood Process As Applied To The Digital Computer Based On The Prats Technique, Leonard Koederitz
A Five-Spot Waterflood Process As Applied To The Digital Computer Based On The Prats Technique, Leonard Koederitz
Masters Theses
"The technique for the prediction of injection rates and production history of a five-spot secondary recovery field pattern as presented by Prats has been significantly modified to permit rapid and accurate digital applications eliminating the heretofore prohibitive reliance upon electrolytic model results for intermediate data values following water front breakthrough"--Abstract, page i.
Anodic Behavior Of Semiconducting Insb Single Crystals In Acidic Solutions, Lih-Da Hu
Anodic Behavior Of Semiconducting Insb Single Crystals In Acidic Solutions, Lih-Da Hu
Masters Theses
"Undoped, semiconducting single, n-type, InSb crystals were used to study the different etching behavior of the inverse {111} planes, to determine the apparent electron number of InSb under anodic dissolution (which corresponds to the sum of the absolute values of the oxidation numbers) and to investigate whether or not the inverse {111} planes show potential differences. The In {111}, Sb {111[repeating]}, {110} and {100} faces were highly polished, etched and immersed in various acidic solutions. Several new etch patterns of the inverse {111} faces were observed in giving other possibilities to distinguish both of the planes. The significant differences in …
Numerical Simulation Of One-Dimensional Three-Phase Fluid Flow In A Stratified Petroleum Reservoir With No Cross-Flow, Ali Mohammed Akbar
Numerical Simulation Of One-Dimensional Three-Phase Fluid Flow In A Stratified Petroleum Reservoir With No Cross-Flow, Ali Mohammed Akbar
Masters Theses
"A numerical model for linear, three-phase fluid flow in a stratified petroleum reservoir has been developed for the purpose of studying water-flooding performance characteristics. Gravity forces, capillary pressure and cross-flow were neglected, but the fluids were considered compressible and evaluations of dissolved gas concentrations have been accounted for. The model was used in evaluating the performance of a water flood project for a hypothetical reservoir which contained the three phases of oil, gas, and water. The results were then compared with those obtained using the Dykstra-Parsons technique. The model produces results which were found to be similar to those obtained …
A Continuous Method For Determination Of The Evaporation Rate Of Zinc, Paul Alan O'Neill
A Continuous Method For Determination Of The Evaporation Rate Of Zinc, Paul Alan O'Neill
Masters Theses
"A method for determination of the evaporation rate of zinc using a continuous recording balance has been devised. Tests were carried out under an inert gas over the range 600°C to 750°C with a total pressure of 1 atmosphere. It was found that the rate of evaporation doubled with an increase of 50°C in this range. Scanning electron microscope photographs show the crystalline nature of the condensate and the presence of a thin oxide layer on some solidified test samples. This oxide layer reduced the rate of evaporation by retarding the zinc vapor escape from the evaporating surface"--Abstract, Page iii.
Simulation Of The Cyclic Steam Injection Process In A Petroleum Reservoir By A Finite Difference Mathematical Model, Jean-Claude Bernys
Simulation Of The Cyclic Steam Injection Process In A Petroleum Reservoir By A Finite Difference Mathematical Model, Jean-Claude Bernys
Masters Theses
"A three-phase, one-dimensional radially layered reservoir simulator is programmed for a large memory digital computer. It is designed to provide a practical solution to the problem of determining optimum soak time during an intermittent steam injection process. The general approach is to (1) develop a representative mathematical model which describes the reservoir; and (2) employ a suitable numerical technique to solve the system of equations which comprises this model. The reservoir consists of concentric cylinders around the wellbore, a pay-zone stratified into thermally connected layers limited on the top and on the bottom by an impermeable cap and base rock, …
Trace Element Anomalies In The Igneous Wall Rocks Of Hydrothermal Veins In The Searchlight District, Nevada, Zuhair Al-Shaieb
Trace Element Anomalies In The Igneous Wall Rocks Of Hydrothermal Veins In The Searchlight District, Nevada, Zuhair Al-Shaieb
Masters Theses
"Two hundred and fifty vein and wall rock samples were collected from Chief of the Hill and the Duplex Mines of Searchlight District, Nevada. The samples were collected along lines approximately normal to the veins. They were analyzed for lead, copper, zinc, silver, gold, arsenic, selenium, and molybdenum using neutron actication analysis and atomic absorption spectrophotometry. Gold, silver, copper, lead and zinc show well-developed anomalies in the wall rocks. In most cases, the concentration of these elements decreases gradually with increasing distance from the vein and reaches background values at a distance of 40-120 feet from the vein. Molybdenum and …
An Experimental Comparison Of Various Nuclei Counters, Joel William Mansell
An Experimental Comparison Of Various Nuclei Counters, Joel William Mansell
Masters Theses
"A series of simultaneous nuclei concentration measurements, with four different nuclei counters, have been made. these counters were a Pollak and a Gardner counter supplied by Mr. Paul Allee of the Environmental Science Services Administration, Boulder, Colorado, and a Pollak and a G.E. counter supplied; by Mr. Norman White of the National Center for Air Pollution Control, Cincinnati, Ohio. In the absence of any knowledge of the absolute concentrations in the samples, the data for each of the individual counters have been compared to the averages computed from all four counters. The results of these comparisons indicate the following: (1) …
A Low Frequency Phase Shift Method, Ronnie Carroll Mcmillan
A Low Frequency Phase Shift Method, Ronnie Carroll Mcmillan
Masters Theses
"The phase shift method of measuring atomic lifetimes is particularly useful because it allows us to make measurements in the steady state mode instead of in the transient mode. High frequency phase shift techniques cause many problems. The equipment, which was designed and built to make low frequency phase shift techniques possible, is shown schematically and discussed. The new experimental techniques employed in our apparatus are a phase multiplier and a unique method of using a photomultiplier as a mixer. In the photomultiplier the final dynode is used as the grid of a triode. The next to the last dynode …
Vertical And Lateral Variations In A Welded Tuff, Ted Richard Dinkel
Vertical And Lateral Variations In A Welded Tuff, Ted Richard Dinkel
Masters Theses
"During the Tertiary period, nuée ardente type eruptions spread large deposits of welded tuffs over southwestern Utah and southeastern Nevada. The Wah Wah Springs Tuff is a member of one of the most extensive of these units, the Needles Range Formation of Oligocene age. Its known outcrop area is estimated at 13,000 square miles. Relief was slight in the area during the time of eruption to enable the flows to spread over so large an area. In an effort to analyze the lateral and vertical continuity of the member, a petrographic study was undertaken. The average composition of the Wah …
A Theoretical Analysis Of The Free Vibrations Of A Clamped Circular Plate With Damping, Bhalchandra Krishnaji Vaidya
A Theoretical Analysis Of The Free Vibrations Of A Clamped Circular Plate With Damping, Bhalchandra Krishnaji Vaidya
Masters Theses
"A theoretical analysis of the free vibrations of a clamped circular plate was undertaken. The effects of transverse shear were considered for application to relatively thick plates in which there exist sharp transients and frequencies corresponding to higher modes. The method adopted by R. D. Mindlin was used to develope [sic] the differential equation of motion for the plate. The damping effect due to the resistance of the medium in which the plate vibrates was also considered. This damping was assumed to be due to the generation of pressure waves caused by the displacement of the plate...Since the solution requires …
Computer-Aided Design Of Lossless Non-Uniform Transmission Lines, Larry Lee Wesner
Computer-Aided Design Of Lossless Non-Uniform Transmission Lines, Larry Lee Wesner
Masters Theses
"A numerical iterative design technique is presented for the synthesis of lossless non-uniform transmission lines. A variational approach is used to minimize an error functional to which the system and boundary equality constraints have been adjoined by Lagrangian multipliers. The resultant network optimization conditions lead to an iterative scheme requiring analysis of the non-uniform line, analysis of an adjoint system and calculation of the error gradient in parameter space. A steepest descent procedure is used to optimize parameter values. Finite difference equations are used to provide an approximation model for implementation on the digital computer. A design example and a …
The Anodic Dissolution Of Molybdenum In Acid Sulfate Solutions, Ching-Kuo Chen
The Anodic Dissolution Of Molybdenum In Acid Sulfate Solutions, Ching-Kuo Chen
Masters Theses
"The world's resources of metals are decreasing. Due to this and the cost of replacing corroded materials, it has come to be realized that prevention is better than cure. The increasing demand for molybdenum and molybdenum alloys has stimulated a great amount of research into the corrosion characteristics of these materials. The result of such research has assisted in the development of suitable molybdenum alloys and protective coatings to retard corrosion. When a molybdenum anode and a suitable cathode are immersed in an oxygen-free electrolyte and are connected to a direct current power source, molybdenum is dissolved. This process is …