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Articles 73831 - 73860 of 77382

Full-Text Articles in Engineering

An Explicit Simulation Of Overland Flow, Glendon Taylor Stevens Jan 1970

An Explicit Simulation Of Overland Flow, Glendon Taylor Stevens

Masters Theses

"Computer simulation of overland flow requires a mathematical model which converges to a true solution. This paper presents a method, based on measurable physical parameters, which insures convergence of a fixed grid explicit numerical solution. Analysis of a wide range of overland flow plane parameters has resulted in an equation of the form Δt = 0. 2 ΔX/So, for the time step increment. This equation provides values for Δt that will insure stability and convergence of the fixed grid explicit numerical method of solving the spatially varied unsteady flow equations. The effect of subarea shape on the rising …

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Determination Of Reservoir Characteristics From Capillary Pressure Curves And Electrical Properties Of Rocks, Prasanta Kumar Guharoy Jan 1970

Determination Of Reservoir Characteristics From Capillary Pressure Curves And Electrical Properties Of Rocks, Prasanta Kumar Guharoy

Masters Theses

"Based upon the assumptions that a porous medium is analogous to a bundle of capillary tubes and that there is equivalence of electrical and hydraulic tortuosity in a porous medium, empirical expressions are presented which relate capillary pressure data and electrical properties of the rock to the porosity, permeability and relative-water permeability, respectively, of completely water-wet rocks. Experimental data are presented for comparison in order to verify their validity. Three principal models are presented, each of which is characterized by a particular expression for estimating tortuosity. The method of determining this parameter was varied in order to find the form …

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A Study Of Microstrip Transmission Line Parameters Utilizing Image Theory, Joseph Louis Van Meter Jan 1970

A Study Of Microstrip Transmission Line Parameters Utilizing Image Theory, Joseph Louis Van Meter

Masters Theses

"This paper is a theoretical investigation of the potential, electric field, capacitance, and characteristic impedance of the open strip transmission line or microstrip configuration based upon the classical Thomson Image Technique. It provides the basis for determination of the charge distribution on the strip and reports impedance values which compare favorably both with experimental values and theoretical work in the current literature"--Abstract, page ii.

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An Investigation Of The Adjustable Element Concept For Design Of Automotive Exhaust Mufflers, Phillip Scott Gegesky Jan 1970

An Investigation Of The Adjustable Element Concept For Design Of Automotive Exhaust Mufflers, Phillip Scott Gegesky

Masters Theses

"The concept of the adjustable muffler is felt to be a step in the direction of easing the present tedium of constructing and testing prototype mufflers. The evaluation of such a muffler also furthers the knowledge of the interaction of acoustic elements. A review of past and present efforts in the design and evaluation of acoustic filters and filter elements is herein presented. Some consideration is given to phenomena, such as tube attenuation and transverse modes of vibration, which are encountered in muffler evaluation techniques. The characteristics of wave guides are discussed at length. The solution of the plane wave …

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Computer-Controlled Processing Of Radar Precipitation Signals And Lightning Data, Gary Wayne Neal Jan 1970

Computer-Controlled Processing Of Radar Precipitation Signals And Lightning Data, Gary Wayne Neal

Masters Theses

"A system for the simultaneous processing of radar precipitation signals and lightning stroke location data has been designed. The system is to be used for the purpose of determining spatial and temporal correlations of lightning and thunderstorm precipitation. This system has been developed to gain further information about the cause-effect relationship between lightning stroke activity and thunderstorm precipitation. Data acquisition and processing is accomplished through the use of an AN/FPS-18 radar set, an SCC-650 digital computer system, a radar interface, and a set of lightning detectors. The radar set provides information on precipitation activity in a circle of radius fifty …

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An Investigation Of Mining Effluent And Water Quality In The "New Lead Belt" Of Southeastern Missouri, Hong Wen Chen Jan 1970

An Investigation Of Mining Effluent And Water Quality In The "New Lead Belt" Of Southeastern Missouri, Hong Wen Chen

Masters Theses

"A field and laboratory investigation was carried out to collect background data for stream water quality in the New Lead Belt of Southeastern Missouri. The parameters measured were temperature, hydrogen ion concentration, hardness, alkalinity, turbidity and fluorides. A prolific algal and microbial growth was found in Bee Fork Creek which receives the mining and milling wastewater effluent from the Fletcher Mine. The laboratory studies were conducted to examine the biological effects of the organic flotation reagents used in the mining operations. The studies included Gram staining of bacteria, antimicrobial effects of milling reagents, bacterial fermentation tests of sodium isopropyl xanthate …

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Magnetohydrodynamic Channel Flow With Non-Uniform Inlet Velocity Profiles, Gwok-Liang Chen Jan 1970

Magnetohydrodynamic Channel Flow With Non-Uniform Inlet Velocity Profiles, Gwok-Liang Chen

Masters Theses

"An analysis is made of laminar magnetohydrodynamic (MHD) flow development in the entrance region of a parallel-plate channel. The problem is formulated in general for any velocity distribution at the channel inlet by extending the linearization method of Sparrow, Lin, and Lundgren for non-MHD duct flows. This method involves linearization of the inertia terms in the equation of motion by introducing a stretched axial coordinate. A closed form solution is obtained for the velocity distributions which are continuous across the channel and along the length all the way from the entrance to the fully developed region. An expression for the …

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The Anodic Dissolution Of Zinc In Potassium Chloride-Potassium Chlorate Solutions, Kuei Chun Chen Jan 1970

The Anodic Dissolution Of Zinc In Potassium Chloride-Potassium Chlorate Solutions, Kuei Chun Chen

Masters Theses

"The anodic dissolution of Zn was studied in Cl⁻-Clo⁻₃; solutions at a temperature of 25ºC. It was found that the apparent valence of Zn ions going into solution was approximately the normal value of two at low current densities. An empirical equation was derived relating the apparent valence to the current density and both concentrations of Cl⁻ and Clo⁻₃. An anodic dissolution mechanism was proposed"--Abstract, page 1.

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Degradation Of Polystyrene Solutions By Capillary Shear, Tyan-Faung Niu Jan 1970

Degradation Of Polystyrene Solutions By Capillary Shear, Tyan-Faung Niu

Masters Theses

"An apparatus has been constructed to investigate the capillary shear degradation of polymer solutions. Maximum shear rates obtainable under flow conditions which could be characterized as nonturbulent were on the order of 10₅ sec⁻¹. The effect of calculated shear rate, initial molecular weight, and number of passes through the capillary tube on the degradation of polystyrene (with M̄v from 22,000 to 1,770,000) solutions in toluene (0.1 wt.%) were studied. The tests in the 0.0105 in. ID stainless steel tube at a calculated shear rate of 1.36 x 10₅ sec⁻¹ show that, for equal number of passes, the lower the …

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Linear Analysis Of Pneumatic Dashpot Damping, Nathalal Gordhanbhai Patel Jan 1970

Linear Analysis Of Pneumatic Dashpot Damping, Nathalal Gordhanbhai Patel

Masters Theses

"The linear analysis of pneumatic damping with orifice or capillary restrictions and with or without mean flow is presented. Temperature and pressure relationships are derived from energy considerations rather than the usual simplification of an assumed polytropic coefficient. Analytical results are compared with the experimental results and a coefficient of heat transfer, Ch, is defined for calculation of the equivalent linear damping factor Cd"--Abstract, page ii.

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Design And Construction Of A Velocity Control System For A Low Turbulence, Vertical Wind Tunnel, Lawrence Vehslage Field Jan 1970

Design And Construction Of A Velocity Control System For A Low Turbulence, Vertical Wind Tunnel, Lawrence Vehslage Field

Masters Theses

"A low velocity (0 - 11m/sec), low turbulence vertical atmospheric wind tunnel has been designed and built by Inca Engineering Company of San Gabriel, California. This tunnel was assembled in the Cloud Physics Research Center at UMR. The tunnel is designed to aid in the study of phenomena associated with water drops suspended in a vertical air stream. This thesis describes the design and construction of the velocity control system for this tunnel. Constant speed, centrifugal fans are used to draw air through the tunnel. To allow these fans to operate at a constant efficiency, a valve system is used …

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Behavior Of A Remolded Silty-Clay Subjected To Sequential Loading, Lawrence Tsi-Ching Chung Jan 1970

Behavior Of A Remolded Silty-Clay Subjected To Sequential Loading, Lawrence Tsi-Ching Chung

Masters Theses

"The investigation was undertaken to determine shear strength and pore pressure parameters of a soil when subjected to sequential loading. This method is intended to similate the in-situ condition of stress application under certain field conditions. The testing procedure, a sequential triaxial shear test, is described. This test consists of successive stages of partial consolidation followed by undrained shear. Triaxial consolidation and shear strength characteristics of a sedimented remolded silty-clay are compared with the results from conventional tests on isotropically consolidated samples. The undrained strength was found to be a function of moisture content, irrespective of the method of test …

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The Electrochemical Behavior Of Molybdenum In Acidic Chloride Solutions, Mun-Shan Lee Jan 1970

The Electrochemical Behavior Of Molybdenum In Acidic Chloride Solutions, Mun-Shan Lee

Masters Theses

"The anodic dissolution of Mo was studied in HC1-KC1 solutions at 25ºC. The apparent valences of Mo ions going into solution were approximately six. Lower values were obtained in HC1 solutions, with the most pronounced changes occurring with the higher concentrations. The resultant ions in solution were Mo-VI. The Mo surface in aqueous solutions appears to be covered with an oxide whose approximate composition is Mo₂O₅. The anodic dissolution is controlled by the oxidation of the surface oxide (Mo₂O₅) to MoO₃"--Abstract, page 1.

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Shear Strength Characteristics Of Crushed Glass, Fred Ray Browning Jan 1970

Shear Strength Characteristics Of Crushed Glass, Fred Ray Browning

Masters Theses

"Drained and undrained triaxial compression tests were performed on two gradations of crushed glass in order to determine the compressibility and shear strength characteristics. Consolidation pressures varied from 10 to 100 psi. Volume changes during consolidation were discussed because of the dependency of shear strength behavior on the density condition at the end of consolidation. Stress-strain-volume change characteristics were observed in order to discuss the load-deformation and dilatancy relationships and the effects of varying density, gradation and consolidation pressure. Stress-strain properties were also determined for the undrained tests. The undrained tests were constant volume tests, thus having no dilatancy effects. …

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Thermal Stresses In Circular Plates Including The Effect Of Transverse Shear Deformation, An-Ton Liu Jan 1970

Thermal Stresses In Circular Plates Including The Effect Of Transverse Shear Deformation, An-Ton Liu

Masters Theses

"This thesis is an extension of the work of T. F. Lehnhoff which used the method suggested by Goodier to develop the Reissner-Goodier small displacement theory for plates subjected to lateral loading. The purpose of this work is to develop a more complete Reissner-Goodier small displacement theory for plates under general loadings, both lateral and thermal, and to provide a solution to the six governing coupled partial differential equations by using a process similar to that of Lehnhoff. Any loading, lateral and/or thermal, that satisfies the Dirichlet conditions of Fourier analysis and virtually any boundary conditions may be handled. Most …

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Shear Degradation Of Polystyrene In Toluene, Ali Asghar Sarmasti Jan 1970

Shear Degradation Of Polystyrene In Toluene, Ali Asghar Sarmasti

Masters Theses

"The purpose of this study was to investigate the extent of flow degradation of narrow molecular weight distribution polystyrene samples under the conditions of laminar flow in capillary tubes. In all cases the solvent was toluene at 25ºC, the polymer concentration was 0.1 weight percentage, and the calculated shear rate at the wall was in the range of 10⁵ - 10⁶ sec⁻¹. The extent of degradation was obtained by measuring the intrinsic viscosity [eta] of the polystyrene samples before and after flow through capillary tubes having a wide range of length/diameter (L/D) ratios. The polystyrene samples here had molecular weight …

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Comparison Of The Buckley-Leverett Technique With A Numerical Simulation Model Containing Heterogeneity And Capillary Pressure, Krishna Kumar Singh Jan 1970

Comparison Of The Buckley-Leverett Technique With A Numerical Simulation Model Containing Heterogeneity And Capillary Pressure, Krishna Kumar Singh

Masters Theses

"A numerical model for a linear, two-phase fluid flow system has been developed with the capabilities of accounting for heterogeneity and capillarity. The model developed is general enough to analyze either water-oil or gas-oil systems. A hypothetical petroleum reservoir (containing only water and oil) under water flood was studied. The results for the homogeneous, no capillary pressure case were found to be similar to those obtained by the Buckley-Leverett technique. The study shows that the Buckley-Leverett is accurate even for a certain degree of heterogeneity. Also, capillarity does not substantially alter the results for the system studied. The results obtained …

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A Socio-Economic Traffic Demand Prediction Model Based On A Lumped System Approach, John Edward Thompson Jan 1970

A Socio-Economic Traffic Demand Prediction Model Based On A Lumped System Approach, John Edward Thompson

Masters Theses

"The objective of this investigation was to devise a method for predicting transportation system demand based on socio-economic variables of certain physical areas. This pilot study was performed utilizing traffic flow, but minor mathematical alterations could change the transportation system to urban mass transit usage demand. An area of uniform socio-economic characteristics can be delineated and the socio-economic characteristics isolated. Each area will place a distinct demand on some existing transportation facility based on those characteristics. The physical demand can be approximated by a theoretical probability distribution. Once this internal flow generation has been approximated by the frequency distribution, it …

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Magnetohydrodynamic Stability Of Laminar Flow In The Entrance Region Of A Parallel-Plate Channel, Thomas Eldon Eaton Jan 1970

Magnetohydrodynamic Stability Of Laminar Flow In The Entrance Region Of A Parallel-Plate Channel, Thomas Eldon Eaton

Masters Theses

"The hydrodynamic stability of laminar flow of an electrically conducting fluid flowing in a parallel-plate channel with an applied transverse magnetic field is investigated. The linear perturbation theory of hydrodynamic stability along with the assumption of low magnetic Reynolds number is applied to the governing equations to derive the governing rnagnetohydrodynarnic stability equation. A finite difference scheme is employed to numerically solve the magnetohydrodynamic stability equation. Neutral stability characteristics of the flow in the entrance region are obtained and presented. The neutral stability characteristics of the fully developed Hartmann flow are also re-examined and compared with those of a previous …

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Influence Of Some Interstitial Materials On The Thermal Contact Conductance, Jin-Tyan Lin Jan 1970

Influence Of Some Interstitial Materials On The Thermal Contact Conductance, Jin-Tyan Lin

Masters Theses

"Experiments have been conducted to investigate the effect of the interstitial materials at the interface of metals in contact. The test specimens were cylinders, axially aligned and loaded. Specimen materials were 606l-T6 aluminum alloy, and the contact fillers were stainless steel wire screens, aluminum foil, paper, and dielectric greases. The tests were conducted at atmospheric environment. The contact pressure ranged from 25 psi to 600 psi. The mean interface temperature ranged from 100 ºF to 200 ºF. Surface roughnesses of specimens were from 25 to 35 micro-inches, rms. The results of the investigation reveal that if the contact surfaces are …

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Cathodic Behavior Of Co, Co-Fe Alloys And Some Other Metals In Acids In A Cathodic Protection Arrangement, Ram Bajaj Jan 1970

Cathodic Behavior Of Co, Co-Fe Alloys And Some Other Metals In Acids In A Cathodic Protection Arrangement, Ram Bajaj

Masters Theses

"During cathodic protection of a corroding metal, electrons are forced into the metal by a sacrificial anode, a battery or a rectifier. These electrons, which constitute the suppressing or external current, are discharged (by H⁺ of the corrosive liquid) on the local cathode of the corroding metal decreasing the emf of the local cells, and, thus, reducing the cell current or the rate of corrosion of the metal. This process was studied in detail by finding out the relationship existing between the cell and suppressing currents. The study was made using two circuits: the cell circuit (representing the local current) …

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Dynamic Analysis Of A Torsional Vibration Actuator, Narayandas Trikamdas Ashar Jan 1970

Dynamic Analysis Of A Torsional Vibration Actuator, Narayandas Trikamdas Ashar

Masters Theses

"The objective of this study is the evaluation of a mechanical system, which includes a Hooke's joint, as a possible torsional vibration actuator. The essential requirement of such a system is to produce a periodically varying angular motion superimposed upon a mean constant speed rotation. The basic kinematics of a Hooke's joint suggest that it could be used to generate the type of motion desired. The mechanical arrangement of a system incorporating a Hooke's joint is described and the governing differential equations are developed. These equations are simultaneous, differential equations of second order and are highly nonlinear. Values of typical …

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A Study On The Feasibility Of Using Pipelines For The Collection And Transportation Of Urban Solid Wastes, William Leo Sago Jr. Jan 1970

A Study On The Feasibility Of Using Pipelines For The Collection And Transportation Of Urban Solid Wastes, William Leo Sago Jr.

Masters Theses

"This study was conducted to determine the technological feasibility of using a tube transport (pipeline) system to supplement and partially eliminate the present inadequate solid waste collecting and transporting techniques employed in most cities throughout the United States. Specific objectives were to develop a practical pipeline system for the transport of refuse by means of a fluid and to determine the uniformity of composition of refuse. The hydrodynamic characteristics of each transport medium, water and Chemical Emulsion., W-4088, were to be determined also. Another item of interest was the degree of grinding necessary to transport refuse by pipeline. An experimental …

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Clay Mineralogy And Compaction Characteristics Of Residual Clay Soils Used In Earth Dam Construction In The Ozark Province Of Missouri, Arthur David Alcott Jan 1970

Clay Mineralogy And Compaction Characteristics Of Residual Clay Soils Used In Earth Dam Construction In The Ozark Province Of Missouri, Arthur David Alcott

Masters Theses

"The clay mineralogy and Standard Proctor compaction characteristics of clayey residual soils developed on the Salem Plateau of the Ozark Physiographic Province and used in earth dam construction were studied. A review of the geology of the Salem Plateau is presented along with a discussion of the factors controlling the development of soils on carbonate bedrock in a high leaching environment. The predominant soil clay mineral was found to be a poorly crystallized kaolinite rather than halloysite as has been postulated by others. Minor amounts of triple-layer minerals and an undetermined amount of an alumino-silicate gel are indicated. The effects …

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A Digital Computer Program For Studying Elasto-Plastic Structural Behavior Due To Cyclic Loading, Rameshchandra Chandulal Hazariwala Jan 1970

A Digital Computer Program For Studying Elasto-Plastic Structural Behavior Due To Cyclic Loading, Rameshchandra Chandulal Hazariwala

Masters Theses

"A computer program has been developed to study the behavior of plane stress structures under cyclic loading. Such phenomena as thermal ratcheting, alternate plasticity, shake-down and the Bauschinger effect may be considered. The incremental theory of plasticity has been used. The program deals with realistic conditions such as nonlinear strain hardening, nonlinear temperature distribution and occurrence of both compressive and tensile plastic flow. The concept of an average material property has been used. Thermal ratcheting of a beam subjected to a constant bending moment and a temperature cycle has been studied in detail. The analysis shows analytically that the rate …

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A Comparative Study Of Experimental And Computed Compressibility Factors Of Methane-Nitrogen-Carbon Dioxide System, Piloo Eruchshaw Ilavia Jan 1970

A Comparative Study Of Experimental And Computed Compressibility Factors Of Methane-Nitrogen-Carbon Dioxide System, Piloo Eruchshaw Ilavia

Masters Theses

"Experimentally determined compressibility factors of a natural gas with impurities like carbon dioxide and nitrogen are found to differ with the values computed by various methods making use of compositional breakup of the gas. Compressibility factors for five mixtures of known composition were experimentally determined at room temperature, 100ºF, 125ºF, and 150ºF, and at pressure ranging between 1000 psi to 4000 psi. Using the known composition of the mixtures, compressibility factors were calculated by additive volume method and by Eilerts method. The deviation between computed and experimentally determined compressibility factors are at a maximum in the lower and higher pressure …

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Principles Of Designing Monitoring Information Systems For Small Construction Contractors, Dan Richard Pellegrino Jan 1970

Principles Of Designing Monitoring Information Systems For Small Construction Contractors, Dan Richard Pellegrino

Masters Theses

"The object of this investigation was to develop a monitoring information system which would comply with the time and cost constraints of the small construction contractor. Every aspect of a monitoring system was considered and logically analyzed. A suggested Monitoring Information System was developed and compared to other monitoring systems in existing literature and also the monitoring system of a local contractor. It was determined by this investigation and comparison that the suggested Monitoring Information System eliminated many disadvantages of existing systems such as: 1) inaccurate monitoring of progress, 2) large number of forms to process, 3) large time lag …

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Chromatographic Determination Of Hydrocarbons Based On Retention Time Data For Squalene And Tetracyanoethylated Pentaerythritol Columns, Mehdi Honarpour Jan 1970

Chromatographic Determination Of Hydrocarbons Based On Retention Time Data For Squalene And Tetracyanoethylated Pentaerythritol Columns, Mehdi Honarpour

Masters Theses

"The purpose of this thesis is to investigate the theory that when several members of a homologous series are injected into a gas chromatograph, at a given flow rate and column temperature, the lograrithm of their retention time as a function of some increasing property of the homologous series may be presented as a straight line and to develop their equations. Experimental procedure was accomplished for the normal paraffin series with 7 1/2% squalene and 10% Tetracyanoethylated Pentaerythritol (T.C.E.pageE.) columns and the relation between retention time and carbon number was determined. The same type of development was employed for aromatic …

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The Anodic Dissolution Of Tin In Acidic Chloride Solutions, Edward Chung-Hong Liu Jan 1970

The Anodic Dissolution Of Tin In Acidic Chloride Solutions, Edward Chung-Hong Liu

Masters Theses

"The anodic dissolution of Sn in acidic chloride solutions (pH = -2.0 to 2.9) was studied at 25ºC. The apparent valence of the dissolving ions varied from about 0.4 to 2.4, a function of both electrolyte and c.d. The complexing of Sn⁺² by Cl⁻ had an important influence with SnCl₃⁻ apparently being the dominant products. A reaction sequence is proposed involving the step-wide oxidation of Sn accompanied by reaction with Cl⁻"--Abstract, page 1.

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Turbulent Structure In The Wake Of Sphere, Darrell W. Pepper Jan 1970

Turbulent Structure In The Wake Of Sphere, Darrell W. Pepper

Masters Theses

"The study of turbulent wakes is considered necessary to understand the droplet behavior associated with the collision coalescence phenomena in atmospheric clouds. The Vertical Atmospheric Wind Tunnel enables experiments dealing with this droplet behavior to be analyzed. The experiments conducted in the UMR Vertical Atmospheric Wind Tunnel consist of two parts: one is the investigation of the flow field characteristics in the test section of the wind tunnel; the other is the measurement of the turbulent structure in the wake of a sphere. The test section is rectangular in design and has a cross-sectional area of 36 square inches (6 …

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