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Articles 2581 - 2610 of 3914
Full-Text Articles in Engineering
Mechanical Properties Of Low Carbon Martensite, Allen L. Affolter
Mechanical Properties Of Low Carbon Martensite, Allen L. Affolter
Masters Theses
"Steels of three different compositions were heat treated and tensile tested in order to determine their mechanical properties after heat treatment. All samples had near 0.20 per cent carbon and two manganese levels 0.90 per cent and 1.35 per cent. One group containing the higher manganese level also had small additions of columbium and vanadium. The specimens were too brittle in the as-quenched condition to be loaded to full strength. Maximum strength and ductility were found after short time tempering at low tempering temperatures -- 2 to 15 minutes at 200º to 300ºF. Higher strengths were found at the low …
Practical Application Of Digital Computer To Distribution Systems, Juan Vincente Saavedra
Practical Application Of Digital Computer To Distribution Systems, Juan Vincente Saavedra
Masters Theses
"Given a three phase ac power distribution system, a digital computer program is presented which determines a complete steady state solution for a given condition. The network data is processed by the computer into an admittance matrix, and these parameters are stored in a manner that enables the computer program to operate upon them as the coefficient of a simultaneous set of nonlinear equations. This set of equations are solved by the Gauss-Seidel Iterative Process improved by a modification of the relaxation method. Practical experience with the distribution system of the Davenport, Iowa, plant of the Aluminum Company of America …
The Artificial Sedimentation Of Soil, John Richard Wagner
The Artificial Sedimentation Of Soil, John Richard Wagner
Masters Theses
"Previous investigations concerned with artificially sedimented soils and a review of the literature on soil structure are summarized. These studies show that many of the physical properties of a soil depend upon its structure and that the structure of a sedimented soil depends principally upon the salt content of the pore water. In addition, artificially sedimented soils have been shown to have a "natural" soil structure. An apparatus was developed which will automatically sediment soils in water of controlled salt content. To determine whether or not the apparatus was able to sediment uniform and homogeneous soil samples, moisture content determinations, …
A Comparative Analysis Of Buyer Patterns In The Asphalt Paver Market, Leonard Llewellyn Decker
A Comparative Analysis Of Buyer Patterns In The Asphalt Paver Market, Leonard Llewellyn Decker
Masters Theses
No abstract provided by author.
Basic Instrumentation Of A Three-Zone Convection Coater Dryer For Calculation Of Heat And Mass Balances, Byron H. Mckinstry
Basic Instrumentation Of A Three-Zone Convection Coater Dryer For Calculation Of Heat And Mass Balances, Byron H. Mckinstry
Masters Theses
No abstract provided.
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 …
Measurement Of The Surface Energy Of Rock By The Three-Point Bending Of Notched Beams, John Walter Corwine
Measurement Of The Surface Energy Of Rock By The Three-Point Bending Of Notched Beams, John Walter Corwine
Masters Theses
"In this investigation, the surface energy of a medium-grained igneous rock (Barre granite) was measured by breaking small, notched beams in bending. The technique was adapted from fracture toughness tests that have been used with metals and ceramics. The equations used for the calculation of surface energy were derived from several writers' equations for the stress intensity at the end of a notch in a beam subject to bending. Beam thickness, notch width and mineral occurring at the notch tip were evaluated for their influence on the calculated values of surface energy. The surface energy values obtained were used in …
Investigation Of The System Al₂O₃-Teo₂-O₂, Vera Zelenkova Sestak
Investigation Of The System Al₂O₃-Teo₂-O₂, Vera Zelenkova Sestak
Masters Theses
"The system Al₂O₃-TeO₂-O₂ has been investigated by X-ray diffraction and differential thermal analysis in air and in sealed silica ampoules. The tellurate, Al₂TeO₆, with tellurium in the +6 valence state, forms in air but not in vacuum at 1 mm pressure. A second phase, a tellurite, possibly Al₂Te₂O₇, forms in air or vacuum by devitrification. The glass-forming region is wider than previously stated and is more extensive in vacuum--from 50% to 98% TeO₂. Tentative phase boundaries have been placed for the system in air and vacuum"--Abstract, page ii.
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.
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 …
Fate And Effects Of Chemically-Precipitated Phosphorus In Anaerobic Digestion, Douglas Wayne Max
Fate And Effects Of Chemically-Precipitated Phosphorus In Anaerobic Digestion, Douglas Wayne Max
Masters Theses
"This study was conducted to determine the fate of chemically-precipitated phosphorus during the overall wastewater treatment process under actual field conditions. Specific objectives were: to evaluate the removal of phosphorus with alum and sodium aluminate in a pilot plant activated sludge system, to determine the fate of the precipitated phosphorus incorporated into the microbial floc when placed in an anaerobic environment, and to observe the effect of aluminum on the digestion process. Five 38-gpd continuous-flow activated sludge pilot plant units were operated at the Rolla Love Creek trickling filter plant and were fed with settled domestic sewage. The sludge from …
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 …
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.
Evaluation Of Cascaded Inertial Vibration Isolation Systems, Rajnikant Bhikhabhai Patel
Evaluation Of Cascaded Inertial Vibration Isolation Systems, Rajnikant Bhikhabhai Patel
Masters Theses
"Cascaded inertial vibration isolation systems are examined in this report. Systems employing one, two or three masses in series on isolators are investigated. The objective is to determine if the cascaded systems have appreciable advantages over the classical single mass system. The equations of motion for these systems are derived by applying Newton's second law of motion. The homogeneous and steady state sinusoidal excitation solutions have been established. Transmissibility of forces and moments to the foundation has been obtained for several cases of force excitation. Comparisons of the cases investigated are based upon the principal mode frequencies, mode shapes, center …
A Systematic Study Of Instrument Variables Upon The Accuracy Of Microprobe Analysis, R. A. Parr
A Systematic Study Of Instrument Variables Upon The Accuracy Of Microprobe Analysis, R. A. Parr
Masters Theses
"The purpose of this investigation was to study the effect of instrument parameter changes upon X-ray intensity measurements of the copper-manganese system. The parameters utilized in this study included: (1) polished, contaminated, and 600 grit surfaces ; (2) constant sample current and constant beam current modes; and (3) 15 KV, 20 KV, and 25 KV accelerating potentials. Inspection of the data disclosed three interesting points: (1) copper and manganese X-ray intensity measurements appear to be a linear function of composition in the 15 KV through 25 KV accelerating potential range; (2) electron backscatter measurements consistently show in a limited range …
Influence Of Film Thickness On The Performance Of Solid Lubricants, Sunil Vishwanath Mahale
Influence Of Film Thickness On The Performance Of Solid Lubricants, Sunil Vishwanath Mahale
Masters Theses
"The object of this investigation was to determine the effect of lubricant film thickness on the coefficient of friction and on the wear life of solid lubricants. Bonded molybdenum disulphide and bonded graphite were the lubricants tested. Dow Corning's LFW-1 and Falex lubricant tester were the two machines used for testing these lubricants. The lubricants were sprayed on the specimen surface. Pretreatment, spraying and curlng were done according to standard or manufacturer's recommended procedures. During the entire research, the procedure for experimentation was followed according to ASTM No. 2625 on Falex and CRC recommendations on LFW-1 machine. It was found …
Analysis Of Elastic Thermal Stresses By Station-Function Collocation Methods, Jaw-Kuang Wang
Analysis Of Elastic Thermal Stresses By Station-Function Collocation Methods, Jaw-Kuang Wang
Masters Theses
"An approximate method for the solution of thermal stress problems is presented. The method makes use of polynomial approximations to reduce the partial differential equation to a system of linear algebraic equations or a set of first-order ordinary differential equations. This results in satisfying the differential equation at a finite number of stations. The boundary conditions are satisfied identically. Two examples of the method, presented in detail, indicate that the solutions of the biharmonic equation for the stress function and the Fourier equation for the temperature distribution have good accuracy with a minimum of labor. A generalized method is derived …
Abandoned Automobiles :A Case History Of Land Pollution, Robert William Arden
Abandoned Automobiles :A Case History Of Land Pollution, Robert William Arden
Masters Theses
"A study has been made of the abandoned automobile problem as it now exists throughout the United States with particular emphasis on the problem in the Saint Louis area. The primary goal of this study was to determine those factors which most influence the collection and disposal of derelict vehicles. The problem was examined in the following major areas: (1) The history of the problem in the Saint Louis area and the various attempts made to correct it, (2) the various businesses directly involved with the disposal of junk automobiles, namely, the auto wreckers and the scrap processors, and (3) …
The Development And Analysis Of A System To Measure Transient Angular Velocity, David Lawrence Persson
The Development And Analysis Of A System To Measure Transient Angular Velocity, David Lawrence Persson
Masters Theses
"A measuring system was built to provide a D. C. voltage which was proportional to the angular speed of a particular rotating shaft under question. The measuring system developed has a time constant of approximately .00365 seconds. The final measuring system was developed after trying various other means which proved unsatisfactory. The final device developed would be quite satisfactory in a wide variety of applications"--Abstract, page ii.
The Closed Cycle-External Combustion Engine And Air Pollution, Galen Lee Pearson
The Closed Cycle-External Combustion Engine And Air Pollution, Galen Lee Pearson
Masters Theses
"The impact of the internal combustion engine on the air pollution problem in this country was presented and alternative propulsion systems for the land transportation vehicle were investigated. The potential characteristics of the more promising closed cycle-external combustion engine concepts were established and discussed. The closed thermodynamic power cycles analyzed include the Rankine, Stirling, and Feher supercritical cycles. Thermodynamic property data on eighteen candidate working fluids for the Rankine and Feher supercritical power cycles have been assembled and were presented in a utilizable form. The thermal efficiency (ratio of the net work out to the heat input) and the many …
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 …
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 …
An Analysis Of A Synchronization Scheme For 180° Biphase Modulated Signals, James Joseph Spence
An Analysis Of A Synchronization Scheme For 180° Biphase Modulated Signals, James Joseph Spence
Masters Theses
"The problem of analyzing a synchronization system for demodulation of 180° biphase modulated signals is considered in this thesis. The system considered utilizes the so-called squaring loop technique. Techniques derived from the theory of Markov processes are utilized in the analysis of the system. In particular the "fluctuation equation" approach for non-Markovian processes is used. After the analysis of the system is performed, an expression fro the bit error probability is obtained from knowledge of the phase error density function"--Abstract, Page ii.
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 …
Measurement Of Thermal Accommodation Coefficients Of Steel Surfaces, Wing On Ho
Measurement Of Thermal Accommodation Coefficients Of Steel Surfaces, Wing On Ho
Masters Theses
"The thermal accommodation coefficient plays an important role in low density thermal energy transfer measurement. The object of this investigation was to measure the thermal energy transfer between a heated test surface and a water cooled reference surface (flat black lacquer) consisting of two infinite concentric cylinders separated by dry air. Two machined and sanded steel cylinders with mean surface roughnesses of 25 microinches and 7.5 microinches were used as the test surfaces . Measurements were made in the pressure range of 1.2 x 10⁻⁶ mm Hg. to 1.8 x 10⁻⁶ mm Hg. and temperature range for test cylinders of …
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.
Digital Simulation Of A Costas Loop Demodulator In Gaussian Noise And Cw Interference, Ajay Mugatlal Mehta
Digital Simulation Of A Costas Loop Demodulator In Gaussian Noise And Cw Interference, Ajay Mugatlal Mehta
Masters Theses
"A digital computer model of a Costas loop has been employed to study the effects of Gaussian noise and continuous-wave interference on the detection of biphase modulated signals. The dependence of bit-error probability, mean-square error between input and output, phase-error variance and threshold on signal-to-Gaussian-noise power ratio, interference-to-Gaussian-noise power ratio and frequency offset of the interference have been investigated and compared with previously obtained experimental results. The model has been verified for its accuracy in the case of no noise and when Gaussian noise is present at its input"--Abstract, Page ii.
Study Of Neutron Reflection From A Curved Surface Using The Monte Carlo Method, Marion Jay Rackley
Study Of Neutron Reflection From A Curved Surface Using The Monte Carlo Method, Marion Jay Rackley
Masters Theses
"The reflection patterns for neutrons impinging on both an infinite parabola and an infinite slab were studied using the Monte Carlo method. In the first case neutrons were sent into an infinite parabola (z =x²/2) moving on the XZ plane parallel to the z axis at 5 points, namely: y = 1.5, x = -1.5; y = 1.5, x = -.75; y = 1. 5, x = 0. 0; y = 15, x =.75; y = 1.5, x = 1.5. The results were that there appeared to be a "focusing" of the scattered neutrons. In the second case, neutrons were …
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 …
Z-Form Solution Of Non-Linear Differential Equations, Allen Joseph Rushing
Z-Form Solution Of Non-Linear Differential Equations, Allen Joseph Rushing
Masters Theses
"The "Z-Forms" developed by Boxer and Thaler from Z-Transform theory are reviewed. Iteration is shown to increase accuracy when Z-Forms are used to obtain numerical solutions to some non-linear differential equations. Machine results are presented for example problems. Error estimates and convergence conditions are discussed. The method is usable only when 2- or 3-digit accuracy is acceptable. For some classes of equations the Z-Form method compares favorably to other numerical methods in time required to set up the problem and in machine time required for solution--Abstract, Page ii.