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Articles 1 - 30 of 118
Full-Text Articles in Engineering
The Cathodic Reduction Of Bromate Ions On Mercury In Neutral And Basic Solutions, Jaw-Shin Chang
The Cathodic Reduction Of Bromate Ions On Mercury In Neutral And Basic Solutions, Jaw-Shin Chang
Masters Theses
"The reduction of BrO⁻₃ was studied in neutral and basic solutions on a stationary Hg surface under activation controlled conditions. Coulombic efficiency studies showed that BrO⁻₃; was reduced to Br⁻ with high efficiencies. The polarization measurements lead to a proposed reaction scheme which is consistent with the experimental observations"--Abstract, page 1.
The Design And Construction Of An Inertia Welder, Arthur Ferdinand Grimm
The Design And Construction Of An Inertia Welder, Arthur Ferdinand Grimm
Masters Theses
"The purpose of this investigation was the design and fabrication of a machine to bond metal to metal using the inertia method of friction welding. This method of bonding is considered far superior to the heretofore employed friction welding processes as will be explained later. The inertia method controls the energy imparted to the weld by using a flywheel which has been brought to a state of predetermined kinetic energy due to rotation. This energy is then transferred to the weld zone in the form of heat due to rotational friction. Hollow specimens with a cross-sectional area of 0.306 square …
Recovery Of Trace Organic Pollutants By Solvent Extraction And Freeze Concentration, William Chih-Wen Chang
Recovery Of Trace Organic Pollutants By Solvent Extraction And Freeze Concentration, William Chih-Wen Chang
Masters Theses
"The objective of this investigation was to evaluate the use of batch type solvent extraction and freeze concentration in recovering trace organic pollutants from water. The work was performed using a simplified water system containing known concentrations of phenol, and natural water systems collected from three sources (Meramec Spring, Gasconade River near Jerome, and Missouri River in Jefferson City) with different levels of pollution. The simplified water system was used to evaluate the effect of the number of extractions, solvent to sample ratio, extraction time, initial organic concentration, pH, and turbidity on solvent extraction; and the effect of volumetric concentration …
Optumr A Digital Computer Program To Cost Optimize A District Heat Piping Network To Remove Waste Heat From Nuclear Power Reactors, James Richard Hendricks
Optumr A Digital Computer Program To Cost Optimize A District Heat Piping Network To Remove Waste Heat From Nuclear Power Reactors, James Richard Hendricks
Masters Theses
"The thermal pollution problem of a nuclear reactor electrical generating facility can be eliminated if an economical, productive use for the waste heat can be found. The computer program presented here is designed to investigate the economic feasibility of utilizing this waste heat to heat buildings. The program optimizes a district heating network using the reactor's rejected heat and performs a comparative analysis with a selected conventional heat rejection system. The results indicate that the system is feasible only if the reactor can be sited relatively close (5 miles) to an urban center. Increasing national concern regarding thermal pollution and …
Bound-Free Continuum Radiation From Non-Gray Nonisothermal Shock Layers, Chu Yih Wang
Bound-Free Continuum Radiation From Non-Gray Nonisothermal Shock Layers, Chu Yih Wang
Masters Theses
"This study investigates the continuum radiative flux from nonisothermal stagnation shock layers composed of atomic gases. The general equations for the composition are derived and the Rankine-Hugoniot equations are simplified and solved to give the thermodynamic conditions of the shock layers. To accurately model the stagnation shock layer, the plasma must be considered to be nonisothermal. In the current study, linear shock layer temperature profiles are assumed. Consequently, the fluid dynamics and the radiation are uncoupled. The radiation model assumes one-dimensional radiative energy transport and considers only continuum processes. The radiative flux is calculated by considereing ground to free state …
Numerical Solutions Of The Torsional Oscillations Of A Shaft-Flywheel System, Mahendrakumar Ramkrishna Patel
Numerical Solutions Of The Torsional Oscillations Of A Shaft-Flywheel System, Mahendrakumar Ramkrishna Patel
Masters Theses
"The application of the finite-difference technique, the Fourier transform, and the Laplace transform for the solution of a system governed by the one-dimensional wave equation is examined. A specific example consisting of a continuous shaft-flywheel system acted upon by an exciting torque applied at a specific section of the shaft is studied. The exact solution to this example is obtained using the classical method of superposition of modes, and is used as a reference to evaluate the accuracy (in terms of the rms error) and relative efficiency (based on computer time) of three approximate solution methods. A sinusoidal excitation was …
Dynamic Analysis Of Multistory Frames Considering Both Distributed And Lumped Mass, Mark E. Botkin
Dynamic Analysis Of Multistory Frames Considering Both Distributed And Lumped Mass, Mark E. Botkin
Masters Theses
"Two types of dynamic analysis of multistory structures are presented in this thesis . First presented is the dynamic stiffness matrix method in which the masses are distributed along the constituent members. This method is composed of statics, stiffness and loading matrices. The statics matrices are established from the structural configurations, the stiffness coefficients are formulated from the elastic properties of the members, and the loading matrices are functions of the time dependent forces or time dependent foundation movements. The applied forces may be uniform, concentrated, triangular or joint forces. Computer programs are given to carry out the laborious calculations …
Anodic Dissolution Of Zinc In Potassium Bromide-Potassium Bromate Solutions, Ying-Cheh Chuang
Anodic Dissolution Of Zinc In Potassium Bromide-Potassium Bromate Solutions, Ying-Cheh Chuang
Masters Theses
"The purpose of this investigation was to study the anodic dissolution of zinc at a temperature of 25°C in Br⁻-BrO₃; solutions. In Br⁻ solutions, it was found that the apparent valences of zinc ions going into solution were approximately the normal value of two. Smaller values were obtained in BrO⁻₃ solutions, with the most pronounced changes occurring in the higher concentrations of BrO⁻₃. An empirical equation was derived relating the apparent valence (zi) to the current density (amp·cm⁻²) and BrO⁻₃ concentration (gmol/liter): 2- zi = 3.11 X i⁰̇̇¹³(CBrO⁻₃)⁰̇⁵⁷ The mechanism for the dissolution of zinc …
A Computer Simulation Of The Internal Ballistics Of Recoilless-Rifle Rocket Launchers, John Edd Mosier
A Computer Simulation Of The Internal Ballistics Of Recoilless-Rifle Rocket Launchers, John Edd Mosier
Masters Theses
"A computer program has been developed to simulate the basic mechanics and gas dynamics associated with launching a solid propellant rocket from a recoilless rifle. This program, entitled "KICKIT," may be used to predict the performance and evaluate many of the pertinent design parameters of both conventional recoilless rifles and a recoilless rocket launcher system. This program is a valuable analytical tool which enables the designer either to optimize the system design or predict the behavior of the system under off-design conditions"--Abstract, Page ii.
Integrating An Oscilloscope Into A General Purpose Automatic Test System, William Charles Bauer
Integrating An Oscilloscope Into A General Purpose Automatic Test System, William Charles Bauer
Masters Theses
"The General Purpose Automatic Test System was developed for the Air Force as a system to automatically test and fault isolate an electronic unit under test. The Test System is a building block concept and this paper developed the hardware and programming software necessary to integrate an oscilloscope into the system. A Tektronix Type 564 oscilloscope with a Tektronix Type 3A5 Programmable Amplifier and a Tektronix Type 3B5 Programmable Time Base was used. A prototype of the digital and analog interface between the Test System and the Tektronix System was built and demonstrated. The Oscilloscope Building Block displays waveforms only …
The Failure Criteria And Deformational Moduli Of Granular Rock, Kyung Chul Ko
The Failure Criteria And Deformational Moduli Of Granular Rock, Kyung Chul Ko
Masters Theses
"Analytical solutions of stress for composite material are obtained by means of mathematical theory of elasticity, assuming spherical inclusions and uniform displacements of boundaries of representative elements. These solutions show that the failure criteria of composite materials are complicated functions of the elastic moduli of matrix, inclusion and composite, and the volume ratio of matrix and inclusion. Combining this theory with Griffith's theory gives a new criteria for brittle failure of granular rook. This theory appears to provide a nearly perfect model for granular rooks, inasmuch as: a) most assumptions used in other criteria are eliminated, b) most phenomena in …
Computerized Methods For Estimating Heating-Cooling-Ventilating System Usage In All-Electric Buildings, Carl William Glaser
Computerized Methods For Estimating Heating-Cooling-Ventilating System Usage In All-Electric Buildings, Carl William Glaser
Masters Theses
"This thesis develops a method and a resulting computer program for estimating the energy input required by the heating-cooling-ventilating system of a building. The computer program has the ability to model the ventilating system and all the inefficiencies introduced when the heating system is allowed to fight the cooling system to provide temperature control within the conditioned space. The program also can consider mechanical heat reclaim accurately, making the consideration on a time of need versus a time of occurrence basis. The program is written to utilize input data in rather simplified form. This allows the program to be used …
Penetration In A Graded Filter, William Chuan Shen
Penetration In A Graded Filter, William Chuan Shen
Masters Theses
"An experimental laboratory study conducted to examine clogging within and penetration of fines into a single layer graded filter. Hydraulic gradient, filter gradation and flow direction were varied. Forty one tests gave over six hundred individual penetration depths. The magnitude of penetration in filters with considerable variation in gradation patterns correlated with an average hydraulic radius based on the volume of voids and an approximated total surface area. It has been shown than an increased thickness of poorly graded filter will stop penetration such as that caused by seepage erosion. A relationship between hydraulic radius, penetration depth and probability of …
Linear Analysis Of Pneumatic Dashpot Damping, Nathalal Gordhanbhai Patel
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.
Behavior Of A Remolded Silty-Clay Subjected To Sequential Loading, Lawrence Tsi-Ching Chung
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 …
A Study Of The Composite Action Of Light Gage Steel Deck And Concrete, Charles Sherman Bach Jr.
A Study Of The Composite Action Of Light Gage Steel Deck And Concrete, Charles Sherman Bach Jr.
Masters Theses
"This thesis is on the investigation of corrugated light-gage steel sheets used as the tension reinforcement for concrete slabs. The steel sheets used had embossments placed at uniform intervals over the entire length of the sheets. The composite concrete and light-gage deck steel were tested to determine a method of design for this type of composite section from an economical, safe and practical standpoint. The investigation covered the flexural, shear and bond capacity of this type of composite section"--Abstract, page ii.
Initial Operation And Calibration Of The Umr Supersonic Axisymmetric Wind Tunnel, James Riley Murphy
Initial Operation And Calibration Of The Umr Supersonic Axisymmetric Wind Tunnel, James Riley Murphy
Masters Theses
"Initial testing and a preliminary calibration were conducted in the UMR supersonic variable Mach number axisymmetric blowdown wind tunnel facility. During initial operations problems were encountered with control valve seat failure, control valve response and stability, and automatic operation. After having brittle fracture failures with seats made of nylon, Teflon and Telfon-copper composite, a copper seat was found to perform satisfactorily with minimal valve leakage. Control valve response and stability were greatly influenced by the setting of the needle valve located between the total pressure probe and the controller. The needle valve setting was observed to depend upon the stagnation …
Dynamic Analysis Of A Torsional Vibration Actuator, Narayandas Trikamdas Ashar
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 …
Turbulent Structure In The Wake Of Sphere, Darrell W. Pepper
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 …
Fracture Surface Energy Determinations Of High Density Polycrystalline Ceramics, Gene Arthur Pahlmann
Fracture Surface Energy Determinations Of High Density Polycrystalline Ceramics, Gene Arthur Pahlmann
Masters Theses
"Values of fracture surface energy were measured for steatite, zircon, mullite and four densities of alumina. Rods of these high density materials were cut into thin rectangular specimens which were notched and broken in three-point loading. The resulting load necessary for fracture of the specimens was used to calculate the fracture surface energy of the materials. The value for the steatite was around 20,000 ergs/cm². The values for the zircon and mullite were on the order of 13,000 ergs/cm², and the values for the aluminas ranged from 17,000 to 24,000 ergs/cm²"--Abstract, page ii.
On The Flow Near An Enclosed Rotating Blade In The Neighborhood Of The Ground, Tze-Lien Liang
On The Flow Near An Enclosed Rotating Blade In The Neighborhood Of The Ground, Tze-Lien Liang
Masters Theses
"The flow in the vicinity of an enclosed rotating blade near the ground was studied both analytically and experimentally. Experimental results were obtained by making pitot tube traverses across the face of the housing but gave only a qualitative indication of the velocity distribution. Tufts of strings were used to locate the flow directions in the vicinity of the ground and the housing. The two dimensional potential flow solution was found to yield unreasonable results for this flow configuration due to viscous and rotative effects. The three-dimensional Navier-Stokes equations were solved numerically by using the successive underrelaxation method. The results …
Transient Response Of A Vibration Isolation System, Hemendra Shantilal Acharya
Transient Response Of A Vibration Isolation System, Hemendra Shantilal Acharya
Masters Theses
"A practical procedure for investigating the performance of a vibration isolation system under transient conditions is presented. For this investigation, an induction motor with an unbalanced rotor is studied during the period when it accelerates to its operating speed from rest. Using Newton's second law of motion, equations of motion are derived, first neglecting and then considering the effect of "inertia torque". This torque is produced by the inertia force resulting from vertical acceleration of the unbalanced mass. The equations are solved on a digital computer using the Runge-Kutta method of order 4. The results obtained are compared with those …
The Anodic Dissolution Of Tin In Acidic Chloride Solutions, Edward Chung-Hong Liu
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.
Oxygen Uptake By The Benthal Sludge Of A Waste Stabilization Pond, Edward Landon Niedringhaus
Oxygen Uptake By The Benthal Sludge Of A Waste Stabilization Pond, Edward Landon Niedringhaus
Masters Theses
"This thesis describes the laboratory evaluation of the benthal sludge oxygen uptake of a 6.7 acre waste stabilization pond which has served a city of 2,400 population for a period of seven years. Special emphasis is directed toward the explanation of laboratory techniques developed for this study to measure the oxygen uptake rate. The effects on oxygen consumption of temperature, nature of sludge, initial oxygen tension, and sludge consolidation are discussed. Benthal sludge samples were taken from three locations in the pond. Oxygen consumption studies were conducted in a specially designed plastic cylinder which included a novel magnetic mixing system. …
The Anodic Dissolution Of Molybdenum In Acidic Nitrate Solutions, Kuan-Hsiung Hoh
The Anodic Dissolution Of Molybdenum In Acidic Nitrate Solutions, Kuan-Hsiung Hoh
Masters Theses
"The anodic dissolution of molybdenum in 1.0 N HNO₃ (pH = 0.3) , 0.1 N HNO₃-0.9 N KNO₃ (pH = 1.2), and 0.01 N HNO₃ -0.99 N KNO₃ (pH = 2.1) was investigated. The following conclusions were possible: 1. Mo is in general electrochemically oxidized to the Mo-VI state during anodic dissolution. 2. The resultant ions in solution are HMOO⁻₄. 3. The Mo surface in aqueous solutions is covered with an oxide whose approximate composition is Mo₂O₅. 4. The polarization curves have a linear Tafel region at potentials slightly above the rest potential. 5. There is no significant effect of …
Next-State Equation Generation For Asynchronous Sequential Circuits - Normal Mode, Gregory Martin Bednar
Next-State Equation Generation For Asynchronous Sequential Circuits - Normal Mode, Gregory Martin Bednar
Masters Theses
"This paper describes the known methods of generating next-state equations for asynchronous sequential circuits operating in normal fundamental mode. First, the methods that have been previously developed by other authors are explained and correlated in a simple and uniform language in order that the subtle differences of these approaches can be seen. This review is then followed by a development of a new method for generating minimal next-state equations which has some advantages over the previous methods. From the comparison of the previous known methods, it is noted that any one of these methods may be desirable for certain designs …
Comparison Of The Buckley-Leverett Technique With A Numerical Simulation Model Containing Heterogeneity And Capillary Pressure, Krishna Kumar Singh
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 …
Analysis Of Parking Conditions At The University Of Missouri - Rolla And Their Comparison To Other Universities, Richard Francis Rankin
Analysis Of Parking Conditions At The University Of Missouri - Rolla And Their Comparison To Other Universities, Richard Francis Rankin
Masters Theses
"The existing parking facilities at the University of Missouri - Rolla are presently inadequate and parking demand will continue to increase in the coming years. Factual study of existing conditions by means of physical vehicle counts indicate that operational efficiency can be increased as a method of reducing the parking shortage. It was determined, by a faculty and staff questionnaire, that the automobile was not greatly required in order to carry out university business. A faculty residence density study indicated that the majority of the faculty members live farther than 7/10 of a mile from the campus. Present methods of …
Thermal Stresses In Circular Plates Including The Effect Of Transverse Shear Deformation, An-Ton Liu
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 …
The Effect Of Solvents On The Desorption Of Phenol From Carbon, Robert Harold Pahl
The Effect Of Solvents On The Desorption Of Phenol From Carbon, Robert Harold Pahl
Masters Theses
"The desorption of phenol from active carbon was studied using cyclic and continuous flow desorbers. A wide difference in desorption capabilities was shown among nine solvents. The system employed was complex, with water being present in addition to phenol on the carbon. An attempt to correlate the desorption data with the physical properties of the phenol and solvent and Regular Solution theory are presented. A thermodynamic approach using the linear free energy-enthalpy relationship produced an apparently good correlation of the heat of formation of the phenol-solvent hydrogen bond with the desorption data. This indicates that the desorption of the phenol …