Digital Commons Network^™

The Effect Of Concentration On The Viscosity Of Polyisobutylene Solutions, Lung-Yu Chou

Masters Theses

"In the past twenty years the viscosity of dilute polymer solutions (i.e., where the solute molecules are far apart) has been investigated in great detail, both theoretically and experimentally. The viscosity characteristics of such systems are well-understood.

Only a few studies have been made of the effect of concentration on the viscosity of polymer solutions in the concentration range where the polymer molecules begin to overlap. This range of concentrations is important in practical applications such as dry spinning of fibers, cross-graded automotive motor oils and in many industrial formulations where polymers are used to thicken solvent vehicles. Development of …

A Procedure For Analysis Of Three-Segment Symmetrical Balcony Beams, Ronald A. Hansen

Masters Theses

"A procedure for analysis of three-segment symmetrical balcony beams unsymmetrically loaded was derived whereby the normally complicated energy solution is eliminated. A moment distribution technique is used in the solution of the first and second phases of the problem. Tables are given to aid in determining the proper distribution factors. Due to the complexity of the third phase, a table of solutions is given for varying values of length, geometry, etc.. An example problem is also given demonstrating the use of interpolation within the tables"--Abstract, page ii.

An Investigation Of The Limitations Of The Antenna Range At The University Of Missouri At Rolla, Ronald Earl Nelson

Masters Theses

"The University of Missouri Antenna Range is described and criteria on range components for acceptable operation are discussed. Discussion of the results of an experimental investigation of component systems of the antenna range is presented. Experimental results are compared to criteria for acceptable operation and recommendations for the improvement of the facility is made. Suggestions are made as to its usage at higher frequencies"--Abstract, page ii.

A Study Of Sedimentation In A Well Regulated Major Drainage Basin - The Monongehala, Allegheny And Upper Ohio Rivers, William S. Wood

Masters Theses

"This investigation is concerned with the study of various programs employed in reducing and controlling sediment. The measures employed by the U.S. Soil Conservation and Forestry Services to control and reduce erosion, the primary source of sediment, was studied. The flood control and river navigation structures constructed and operated by the U.S. Army Corps of Engineers and the effect of these structures on sedimentation was also evaluated. State and local community regulation and control of exploited natural resources was studied to determine their influence on the generation and control of sediment.
The Allegheny, Monongehala and upper Ohio River Drainage Basin …

Hydrogen Absorption And Corrosion Studies Of Zone-Refined Iron, Chang Don Kim

Doctoral Dissertations

"The lattice constants of zone-refined iron filings and iron whiskers are 2.86623 and 2.86626 Å at 25°C respectively. Their thermal expansion coefficients are both the same, 12.1 x 10⁻⁶ /°C at temperatures 10 - 65°C.

The influence of hydrogen on the lattice constant of iron was investigated and it was found that hydrogen has no effect (within the limits of errors) on the lattice constant of iron at room temperature regardless of the charging methods. However, at elevated temperatures hydrogen expands the iron lattice due to increased solubility of the gas. The lattice constant of iron in vacuum and in …

A Study Of The Anodic Oxidation Of Acetylene On Gold Electrodes, Jo Lisle Reed

Doctoral Dissertations

"The object of this investigation was to establish a mechanism for the anodic oxidation of acetylene on gold electrodes in aqueous solutions. It is known that anodic oxidation of organic compounds on gold electrodes produces a large number of organic intermediates and end products. Therefore, it appeared worthwhile to establish a mechanism that could provide a better understanding of the fuel cell electrode kinetics and possibly lead to new methods of organic syntheses"--Introduction, page 2.

A Theoretical Approach To The Problem Of Determining Ejecta Volumes In A Gravitational Vacuumed Half-Space, William J. Karwoski

Doctoral Dissertations

"The formation of an explosion crater is a highly complex process. All of the pertinent parameters governing the mechanisms of cratering are not clearly understood or known. Many cratering experiments were performed in desert alluvium in an effort to relate crater dimensions with charge weight and depth of burst. Various scaling laws were devised in an attempt to correlate the data gathered from these experiments. When cube-root scaling was used to correlate results of tests conducted at a constant scaled depth of burst, larger charge weights consistently gave smaller scaled results. This was particularly true of apparent crater volume. When …

The Statistical Mechanics Of Kink Interactions, Michael Brewer Mcneil

Doctoral Dissertations

"Using a potential derived from continuum elasticity, the interactions between kinks on a dislocation line are studied as special cases of the problem of a one-dimensional system of interacting particles. By the use of constant pressure ensembles, the principal kink-interaction problems of physical interest are solved. The application of these solutions to the theoretical analyses of work hardening and internal friction is explored and comparisons made to previous work in which kink interactions were neglected; it is found that, as would be expected, variations of equilibrium kink populations with external stress cannot account for the Bordoni peak, which must therefore …

A Periodic Dielectric Rod Antenna, Robert C. Peirson

Masters Theses

"The periodic dielectric rod antenna structure under consideration consists of identical dielectric rod sections of radius a meters situated on a common axis. These sections are of length 1₁ meters and are separated in free space by distance 1₂ meters.

Field analysis employing Floquet's theorem, in terms of the exemplary TM₀₁ circular mode, gives expressions for the various field components and an eigenvalue equation. Digital solution of this eigenvalue equation establishes the location of propagation bands as a function of frequency. Such bands are characteristic of any periodic wave guiding structure."--Abstract, page ii.

Analog Simulation Of The Voigt Solid, Richard F. Pohl

Masters Theses

"A method of reducing a mixed partial differential equation with boundary conditions to a form suitable for programming on the analog computer is developed. Presented along with the computer program set up to be used on the EAI TR-48 analog computer is a systematic check procedure to indicate possible computer malfunctions and programming errors. The results of the computer simulation are presented and supported with observed data"--Abstract, page ii.

Location Of Maximum Moments In A Continuous Two Span Beam Due To Moving Loads, Thomas Houng-Yn Yang

Masters Theses

"The objective of this investigation is to determine the positioning of vehicle wheels so as to cause maximum positive and negative moments in a two span continuous girder. Several variables are considered, namely, the ratio of loads to each other, the distance between wheels, and ratio of one span length to the other. The necessary equations are derived and the results, after being programmed on a computer, are shown in a series of curves.

These curves serve as a tool for the designer, enabling him to arrive at design moments by simple substitution in the appropriate moment expression, within the …

An Algorithm For The Synthesis Of Nand Logic Networks Using A Diagrammatic Approach, Donald Robert Nelson

Masters Theses

"A diagrammatic approach is presented for the synthesis of multilevel NAND networks realizing combinational logic expressions. The network synthesized is restricted to only uncomplemented inputs. The synthesis algorithm involves the determination of minimum sum of products and product of sums expressions for a Boolean function, construction of an α-ß diagram from these expressions followed by implementation with NAND gates directly from the diagram. The resulting network is a minimal or near minimal NAND gate realization of the given function. The algorithm is applicable to completely or incompletely specified Boolean functions and is extended to include NOR synthesis"--Abstract, page 2.

A Nonlinear Sampled Data Feedback Control System Employing Pulsed Thrust Position Control, John D. Corrigan

Masters Theses

"This thesis shows that reaction jet thrust pulses, each of constant amplitude and time duration, in conjunction with sampled data error information can provide satisfactory position and/or attitude control for space vehicles.

Incremental phase-plane analysis of the system yields a technique for determining system response and suggests a means of compensation. Control system response for the vehicle under the influence of external forces is shown to be satisfactory by digital computer simulation"--Abstract, page ii.

Phase And Amplitude Distributions Of An Unsymmetrically Fed Ground Plane Aperture, Leslie Blumberg

Masters Theses

"An anechoic chamber for use in the B-12 KHz range was designed and built for the purpose of obtaining the far field patterns of antennas and radiation systems. This chamber was evaluated and compared with various types of anechoic chambers from the standpoint of their "room performance."

The anechoic chamber is essentially a room lined with absorbing material, effective at microwave frequencies. The purpose of the absorbing material within the room is to present the reflection of the energy incident upon the walls of the room.

Measurements of the far field radiation pattern of an aperture in a ground plane, …

A Study Of The Effect Of A Square Cutout On The Moment Distribution In A Simply Supported Rectangular Plate Under Normal Concentrated Load By The Moiré Fringe Method, Taher F. Raja

Masters Theses

"Plexiglass models were used to produce Moiré fringes for two different geometrical shapes. The moments in the case of a simply supported rectangular plate with a normal concentrated load were found using the Moiré fringes which directly give the gradients at all points of the surface of the model. The variation of the moments due to a square cutout was also studied by this method. As a check for the experimental method, the analytical solution was presented for the plate without a cut-out. The Moiré method yields moments to an accuracy of 3 to 15 percent, however, care must be …

The Effect Of Combined Torsional And Bending Loads On A Channel Beam With One End Restrained From Warping, David M. Schaeffer

Masters Theses

"Channel beams have been designed with the main purpose of giving large resistance to bending while the torsional strengths are known to be relatively small. In this experiment, a cantilevered channel beam was loaded with a concentrated load at the free end, first through the experimentally determined shear center and then through the centroid of the cross section. For each loading condition, the strains were measured with the aid of SR-4 strain gages placed at intervals along the length of the beam. With the aid of a computer, the strains were converted into longitudinal stresses and these stresses were compared …

Modification Of The Hydraulic Jump By Submerged Jets, Edward Leon Tharp

Masters Theses

"Tests were performed in order to determine the effect of submerged jets injecting water into the base of the hydraulic jump. The jump was studied in terms of the following properties: specific energy of the flow leaving the hydraulic jump, length of the hydraulic jump, tailwater depth, and wave formation properties. These properties for the hydraulic jump with submerged jets were compared to the natural hydraulic jump.

Results of the tests indicate that: submerged jets at any angle tested tend to decrease the specific energy of the water leaving the jump and are more effective than the impulse-momentum principle indicates, …

Minimum Cost Data Collection Techniques For Circulation Control At The University Of Missouri At Rolla Library, John Peter Shewchuk Sr.

Masters Theses

"Data collection is beginning to assume increased importance in the field of data processing. This thesis investigates a method for quantitatively selecting a portion of the library to place on an automated circulation control system that uses data collection as an entry into a data processing system.

The circulation function of the library was considered to be an inventory problem. Titles were considered as items of inventory and circulation of that title was considered to be a "sale" of that item. The IMPACT method was used to distribute items (titles) in a sample by age. Various ages were found to …

Analysis Of Sand Asphalt Mixtures, Maurice A. Sayegh

Masters Theses

"The objective or this investigation was to determine the optimum percent of asphalt which should be added to the sand asphalt mixture. Also the effects of filler on the properties or the sand-asphalt mixture were evaluated.

The variables in this study were mineral filler, asphalt cement, and asphalt content. The sand used in this study was sub-rounded, and uniformly graded. The asphalt was asphalt cement with two different penetrations, one of 85-100 penetration grade and the other of 120-150 penetration grade.

Three different groups of mixtures of sand-asphalt were prepared. The first group consisted of adding 85-100 penetration asphalt to …

Analysis Charts For Single And Multi-Span Gabled Frames, John (Chung-Su) Ma

Masters Theses

"A method for analyzing single and multi-span gabled frames using analysis charts is presented. This method requires considerably fewer computations than methods previously used (such as the moment distribution and slope-deflection methods). Analysis charts are presented for single gabled frames having fixed or pinned ends at ground level, and charts are also presented which can be used to efficiently analyze multi-gabled frames.

The data for the analysis charts were obtained using matrix techniques in conjunction with the digital computer. These techniques are described"--Abstract, page ii.

Anodic Dissolution Of Silver In Aqueous Solutions, B. W. Jong

Masters Theses

"The purpose of this investigation was to study the anodic dissolution of silver in various electrolytes to determine if there existed any deviations from Faraday’s law in nitric acid-silver nitrate solutions. The effect of small additions (10^-4 and 10^-5 N) of Cl^-, SO₄⁼, and CrO₄⁼ on the apparent valence and dissolution potential was also studied. Current densities were varied from 0.00 to 0.07 amp·cm^-2.

Based on the observed apparent valences and a grey film containing metallic particles on the anode surface, it was concluded that deviations from Faraday’s law …

Some Effects Of A Non-Uniform Specific Charge Upon Space Vehicle Parameters, Geary L. Leger

Masters Theses

"An equation is derived for the space-charge-limited current of an ion beam when there exist n different species of ions in the beam. The combined effects of non-uniform specific charge and space-charge-limited conditions upon thrust, propellant flow rate, and payload ratio are studied, and a graphical investigation and interpretation is made.

This thesis will show that: (1) The existence of multiply ionized species in an ion beam will increase the space-charge-limited current over that expected in a beam composed of purely singly ionized ions, (2) the thrust produced by the ion beam is independent of the non-uniform specific charge distribution, …

A Crystallographic Study Of The Pbzro₃-Pbtio₃-Bifeo₃ Ternary System., Dannie R. Clarida

Masters Theses

"The purpose of this investigation was to conduct a crystallographic study of the PbZrO₃-PbTiO₃-BiFeO₃ ternary system, where all three components are perovskites. Lead zirconate is antiferroelectric, lead titanate is ferroelectric, and bismuth ferrate is thought to be ferroelectric. X-ray diffraction analysis was employed to determine the crystallographic structure and lattice parameters.

A tetragonal region was found to exist in the area of high PbTiO₃ content. A rhombohedral region occurred in the remainder of the system with high BiFeO₃ and PbZrO₃ content, except for an orthorhombic envelope along the PbZrO₃-BiFeO₃ side of the diagram up to approximately 70 per cent BiFeO₃.The …

Some Effects Of Sodium Pentachlorophenol On Activated Sludge And Minnows., James Albert Heidman

Masters Theses

"The primary purpose of this investigation was to determine the effect of sodium pentachlorophenol on activated sludge. An additional objective was to determine the toxicity of sodium pentachlorophenol to minnows.

All activated sludge units were grown on a glucose and mineral nutrient waste. In addition, a unit acclimated to 100 and 250 mg/1 of sodium pentachlorophenol was also studied. The effect of a shock loading of sodium pentachlorophenol was found to depend on the concentration of the loading and also on the group of micro-organisms which were predominating. One activated sludge system was seriously impared at a shock loading of …

Synthesis And Structural Determination Of Intermetallic Compounds In The Fe-Ho System, Gerald J. Roe

Masters Theses

"The intermediate phases in the holmium-iron system were investigated by means of X-ray diffraction and metallographic examination. The intermediate phases identified by X-ray diffraction data were HoFe₂ , HoFe₃ , HoFe₅, and Ho₂Fe₁₇.

A new intermediate phase, HoFe₃, was found. HoFe₃ was indexed as hexagonal with lattice parameters of a = 5.084 Å and c = 24.45 Å, and was thought to be of the space group R3̄̄m.

HoFe₂ was formed by a peritectic reaction and its solidus was estimated to be between 1325°C and 1340°C. suggested to be a congruent melting intermetallic compound with a melting point below 1340°C. …

A Study Of Modified Plug Designs For A Globe Valve, Robert W. Wagner

Masters Theses

"This thesis presents an empirical study of the characteristics of a cylindrical skirted disk valve used as a flow regulating device. Holes were drilled in two separate removable cylinders, which, when respectively attached to the valve plug adapter, provided control of the flow rate. These cylinders could be moved to permit exposure of more or less flow area by means of the valve stem and crank mechanism. At the closed position of the valve no holes were available for flow within the differential pressure zone of the valve, while at the full-open position all the drilled holes were within the …

Approximate Solution Of The Momentum And Energy Equations For Partially Ionized Argon, Sir-Hoi Chen

Masters Theses

"Based on available experimental data, the transport properties of partially ionized argon gas have been determined by solving the integral equations of momentum and energy conservation by an approximate method. The momentum and the energy conservation integral equations are solved simultaneously by an iteration method by assuming both parabolic and cubic velocity and temperature profiles separately. The results are compared with the case of linear velocity and temperature profiles"--Abstract, page iii.

The Development Of A Modified Soil Shear Vane, Vernelle Truman Smith

Masters Theses

"The purpose of this investigation was to determine how the soil shear graph could be modified to measure more accurately values of shear strength of fine-grained, cohesive soils. Several modifications were tried, however, the one that gave the most satisfactory results consisted of a vane and base plate mechanism.

A red clay of high plasticity obtained from a local cave was tested in both the natural or undisturbed state and in the remolded state. The only variable was the moisture content. Compaction effort was the same for all remolded specimens. Tests were conducted on undisturbed samples taken with thin walled …

An Investigation Of Consolidation On Compacted Partially Saturated Clarksville Soil, Ma-Tai Matthew Chen

Masters Theses

"The Terzaghi theory of consolidation and the assumption of his theory, pore pressure and effective stress, secondary compression and rheology were all reviewed and discussed. Eight compacted unsaturated samples made from Clarksville silty clay (CL) under different compaction efforts and moisture contents were subjected to consolidation load increments. Each load increment was maintained for 24 hours. An extra compacted sample was loaded for one month to investigate secondary compression.

From e-p curves, five settlement vs. compacted embankment height curves were derived for different compaction effort and moisture contents. These curves may be of practical use, when checked by field measurements …

Kinetics And Mechanisms Of Base-Catalysed Reactions, Rohit Panalal Sheth

Masters Theses

"Base-catalysed reactions normally involve complex series of transformations. their kinetics is usually governed by a variety of equilibria, participating in the overall and concurrent processes as well as by competitive side-reactions that interfere with the normal course of such reactions. Mechanisms which have been proposed, by and large, are primarily based on product, by-product and intermediate analyses together with some scattered kinetic and isotopic evidence. In the cases where kinetic studies have been attempted, highly complex mechanisms have usually been proposed due to the frequent necessity of using heterogeneous media or employing involved mathematical treatments to describe the kinetics of …