Digital Commons Network^™

An Analysis Of An Audio Amplifier Utilizing An Operational Amplifier And Negative Feedback, Anthony Francis Lexa

Masters Theses

"An audio amplifier utilizing a monolithic operational amplifier is analyzed. The analysis is a block diagram approach where the amplifier is divided into three parts; operational amplifier, power amplifier, and feedback network. A Fourier series analysis is used to describe the distortion and signal components of the amplifier output. The results of this analysis demonstrate the advantage of large negative feedback on frequency response and harmonic distortion. Using relatively few passive components a high quality audio amplifier is constructed with an output power of 15 watts RMS power and negligible harmonic distortion"--Abstract, page ii.

Analysis Of A Water Level Control, Bhupendra Girdharlal Shah

Masters Theses

"This thesis presents the analysis of a controller for a liquid level control system. The controller was built using an analog computer providing the ability to easily construct up to three modes of control. The controllers analyzed were: 1.) Proportional, 2.) Proportional plus reset, and 3.) Proportional plus reset plus preact. The system was tuned experimentally to provide satisfactory operation and root loci were also plotted to show the system stability for the three modes"--Abstract, page ii.

Calculation Of Optimum Conditions For Simultaneous Heat And Mass Transfer In Porous Membranes, Chia-Chang Liu

Masters Theses

"The object of this investigation was to study desalination using evaporation through porous membranes and to estimate the economic potential of the method. The major factors affecting the economics were: 1. The saline water temperature into the evaporator, t_sl; 2. the temperature driving force in the evaporator, DF; 3. the temperature driving force in the heat exchanger, DTEX; and 4. the saline water temperature leaving the evaporator, t_s2. The optimum conditions based on cost of water product were studied by calculating water costs under a wide range of conditions. for any given set of variables t …

Film Boiling From Inclined Flat Surfaces, Charles Ernest Price

Masters Theses

"The object of this investigation was to determine the effect of inclination on the heat transfer for saturated film pool boiling from a flat plate heater. Nitrogen at atmospheric pressure was used as the test fluid. The test plate was oriented at various angles from the horizontal position and the convective film coefficient was determined for each angle. Tests were conducted for heater angles of 0°, 30°, 60°, and 90°. The heater strip was placed in a container of the liquid and was heated electrically. Heat transfer results were obtained for plate temperatures ranging from 100 to 800°F. As the …

Nuclear Parameter Study In One, Two, And Three Dimensions, Jan Robert Lojek

Masters Theses

"A parameter study comparing one-, two-, and three-dimensional reactor design analyses was undertaken. Computer programs (codes) were used extensively for the computations and running times on the IBM 360/50 were observed. The values of primary concern were neutron flux shapes, effective multiplication factors, and fuel depletion. Dresden I nuclear power plant with fuel type 1 represents the model reactor. Cross section calculations were performed using the nuclear codes HRG and TEMPEST II, FEVER, EXTERMINATOR-2, AND FLARE generated the nuclear parameters"--Abstract, page ii.

A Study Of Different Types Of Connections To Structural-Steel Square Tubings, Chao-Sheng Chen

Masters Theses

"Although square tubular element has long been recognized as an ideal structural member, its acceptance was limited by the lack of detailed knowledge on suitable connections related to this geometric shape. It is structurally inefficient to use a strong column poorly connected to a strong beam. So it is necessary to understand, in advance of adoption, the effect and behavior of different types of connections and to develop an efficient structural system. In this study, the ordinary column-to-beam framing with different types of connections has been investigated. The three types of connections are single-plate connection, double-angle connection, and multi-angle connection. …

Thermal-Fatigue Of Type 304 Stainless Steel, Gajinder Bir Singh Arora

Masters Theses

"Thermal fatigue resistance of unrestrained samples of type 304 stainless steel has been investigated under different test conditions. The following studies are reported: (a) effects of heating and cooling rates on the initiation of cracks, (b) effects of upper and lower cycle temperatures on the initiation of cracks, (c) effect of water quenching and (d) the manner in which cracks initiated and propagated. It is shown that under cyclic conditions involving maximum temperatures up to 1000°C, the thermal fatigue life of the material decreases rapidly with rise in the maximum temperature of the cycle. The increase in the lower cycle …

Further Investigation Of The Traveling-Wave Transistor, Robert J. Feugate

Masters Theses

"A brief introduction to the concept of a traveling-wave field-effect transistor is presented. Analytic solutions for certain lossless and lossy special cases are derived and a numerical method for solution of the general case developed. A possible computer program for implementing this numerically is given and utilized to compare the traveling-wave transistor to a conventional field-effect transistor amplifier"--Abstract, page ii.

The Effect Of Thermal-Mechanical Processing Of The Exfoliation Corrosion Resistance Of An Aluminum-Zinc-Magnesium-Copper Alloy, James Lawrence Spehr

Masters Theses

"The objective of this investigation was to evaluate the effect of thermal-mechanical processing on the exfoliation corrosion resistance of an aluminum-zinc-magnesium-copper alloy. the aluminum alloy used was commercially available 7178 alloy in two thicknesses, 0.390 inch thick and 0.250 inch thick. this material was reduced 10, 25 and 40% in thickness in both the annealed and solution heat treated conditions. The material was then aged to a high strength condition, T6, or T8, in the case of the material reduced in the solution heat treated condition. The effect of the thermal-mechanical processing on the exfoliation corrosion resistance was then evaluated …

An Investigation Of Transient Negative Resistance In A Cadmium Sulfide Device, John Irvin Giem

Masters Theses

"An analysis has been made of a CdS device which exhibits a transient negative resistance at room temperature and low field strengths whereas previously reported cases of negative resistance in CdS were observed at low temperatures and moderate to high electric fields. The CdS bar was illuminated on one end in the vicinity of an ohmic In contact. Contact was made to the other end of the device with a rectifying Ag contact and the device was reverse biased. Experimental evidence and the analytical results both indicated that it is necessary that the material used to make the negative resistance …

Solution Of The Two-Dimensional Multigroup Neutron Diffusion Equation By A Synthesis Method, William Ray Heldenbrand

Masters Theses

"A method, called the higher mode synthesis method, for the solution of the two-dimensional neutron diffusion equation is developed. In this method, the two-dimensional eigenfunction is expanded in terms of one-dimensional fundamental and higher eigenfunctions. A substitute, weight, and integration procedure is applied and the two-dimensional equation is reduced to a one-dimensional equation in terms of expansion coefficients. The expansion coefficients are combined with the trial functions in order to obtain the two-dimensional eigenfunction. This procedure results in a significant reduction of computation time as compared with standard iteration methods"--Abstract, page ii.

Direct Measurement Of Dynamic Capacitance, Norman G. Dillman

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

Behavior Of Steel Building Connections Subjected To Inelastic Strain Reversals, E. P. Popov, R. B. Pinkney

CCFSS Library (1939 - present)

Inelastic design of steel structures to withstand seismic forces requires a knowledge of the behavior of connections when subjected to cyclically reversed loading. This report contains a description of the design and testing of selected steel beam-to-column connection specimens. The motivations for the choice of connection types and overall geometry of the specimens are discussed, relating them to full-size prototypes used in actual building frames. The characteristics of the test installation are described, including means of loading, type of lateral support provided, etc. The programs of cycling of all tests are presented in terms of the deflection of the tip …

A Theoretical Model For Gas Separation In A Glow Discharge: Cataphoresis, Fredrick H. Shair, Donald S. Remer

All HMC Faculty Publications and Research

A theoretical model for transient and steady-state cataphoresis is developed starting with the macroscopic equations of continuity. After a brief breakdown period, the impurity ions are assumed to be closely coupled with their neutral counterparts. The basic assumptions in the model are that after breakdown, the level of ionization of the impurity, and the axial electric field remain constant; it is demonstrated that under these conditions a system involving rapid ionization-recombination reactions is equivalent to a system in which no reaction occurs, but in which the "effective'' ion mobility is a product of the true ion mobility and the fraction …

Response Of Steel Frames To Earthquake Forces, M. J. Kaldjian, Wm. R. S. Fan

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

Response Of Multistory Steel Frames To Earthquake Forces, Subhash C. Goel

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

Behavior Of Steel Building Connections Subjected To Inelastic Strain Reversals Experimental Data, E. P. Popov, R. B. Pinkney

CCFSS Library (1939 - present)

No abstract provided.

Design Recommendations For Diaphragm-Braced Beams, Columns And Wall-Studs, T. V. S. R. Apparao, George Winter, S. J. Errera

CCFSS Library (1939 - present)

INTRODUCTION Light gage steel panels are often used as wall sheathing, roof decking or floor covering in steel framed buildings. These panels carry loads normal to their plane by virtue of their bending strength. Also, diaphragms formed by interconnecting such panels can resist shear deformation in their plane. Because of this shear resisting capacity, diaphragms can be very effective in bracing columns and beams of a steel frame against lateral buckling and, thus, increase the load carrying capacity of these members. For wall columns, such diaphragm bracing may be either directly attached or connected to girts which in turn are …

Investigation Of Torsional-Flexural Buckling Of Thin-Walled Open Sections With Unequal End Eccentricities, Nuri Celebi, George Winter

CCFSS Library (1939 - present)

INTRODUCTION Compression members of thin walled open sections may buckle in the torsional-flexural mode at loads lower than the Euler buckling load, because of their low torsional rigidity. Doubly symmetric sections, loaded eccentrically in the plane of symmetry, buckle in the torsional-flexural mode when sufficient strength against flexural yielding is provided in the plane of loading. In singly symmetric sections, the shear center and centroid do not coincide. When such sections are loaded in the plane of symmetry, flexural buckling out of the plane of loading is possible only if the load acts at the shear center. Otherwise, torsional flexural …

A Study Of Thermoacoustic Oscillations At Elevated Static Pressures, Michael Einar Berger

Mechanical Engineering ETDs

An experimental investigation was conducted to determine the effect of high static pressure on a closed thermoacoustic sound generator.

The theory for thermoacoustic oscillations is reviewed and analyzed for the case of elevated static pressure. Design equations for high internal pressure oscillators are developed from the principles of dimensional analysis, and a general de­sign equation is proposed.

A closed double-end thermoacoustic oscillator was designed to withstand high temperatures and pressures and was used in the experimental investi9ation. Both air and helium were used as the working gases.

The results of both the theoretical and experimental investigations show that acoustic sound-pressure …

Economic Feasibility Of Increasing Southwestern Water Supplies Through The Reduction Of Evaporation And Evapotranspiration, William C. Hughes

Civil Engineering ETDs

Each year a large portion of the southwestern water supply is lost through evaporation and plant transpiration. The growing water shortage in the Southwest makes vegetation manipulation and evaporation suppression to reduce these losses increasingly attractive. These losses can be successfully reduced, but it has been difficult to estimate how much additional water large scale vegetation management and evaporation control could produce. Three hydrologic models were developed for the Pecos River Basin in New Mexico to estimate the additional water which could be obtained by vegetation treatment in the forested headwater areas, the removal of salt cedar in the lower …

An Analysis And Comparison Of Linear Phase Bandpass Filters, Darrell L. Ash

Theses and Dissertations

The ideal bandpass filter is defined as one which uniformly attenuates and delays all frequency components within the passband and effects zero transmission of all components outside the passband. For reasons which will be subsequently discussed, it is impossible to realize a stable lumped-element filter having this ideal characteristic. This has made it necessary to find ways to physically approximate such a characteristic. Some of the more widely used methods will be compared and analyzed in this paper.

An Experimental Investigation Of Proportional Braking, Rudolf Limpert

Theses and Dissertations

In recent years automobile safety has become more and more important.The braking device contributes largely to the problem of safe driving.

Design And Operation Of Equipment For Impact Test Of A Hydraulic Cushion, Harshadbhai R. Patel

Theses and Dissertations

In recent years, experiments have been carried out to evaluate the performance of water-filled cushion cells used to attenuate energy of automobile collisions. The water-filled cushion cell is a vinyl plastic cylinder of 6 inches nominal outside diameter, 1/4 inch wall thickness, 40 inches length, closed at the bottom by a cast-in-place vinyl plug and partially closed by a bolted-in vinyl diaphragm at the upper end. These cells are designed to be installed in the path of a crashing automobile to absorb and dissipate the kinetic energy of impact. Properly designed cushions could be used as one means of saving …

Development Of A Generalized Structural Dynamics Computer Program, Val E. Simmons

Theses and Dissertations

The purpose of this thesis was the development of a generalized structural-dynamics computer program to calculate the response of multi-degree-of-freedom systems. The user of this computer program, having a limited background in matrix algebra and vibrational analysis, can gain numerical and graphical information concerning the dynamic response of multi-degree-of-freedom structures. The user, with a minimal amount of FORTRAN experience, will find this thesis ideally suited for his needs.

Semiconductor Nuclear Detectors, Lulio V. Guevara R.

Electrical and Computer Engineering ETDs

For the last 8 years the development of nuclear detectors have been shown to have the best potentialities over the other kind of nuclear counters. In this report we studied in general the characteristics of semiconductor nuclear counters and then we experimented with two types of semiconductor detectors, the surface barrier and the diffused junction detectors. Several materials were analyzed for the fabrication of these detectors. Silicon was finally chosen because of its advantages over other materials for fabrication of semiconductor counters, such as low cost and grade of purity. Silicon wafers, n-and p- type, were obtained from Monsanto Company. …

The Mechanism Of Second Breakdown In Transistors, Eugene David Fabricius

Dissertations

The purpose of this dissertation is to examine the behavior of electrons and holes in a semiconductor or diode under conditions of high current density as a function of temperature, and to relate this behavior to the phenomenon of Second Breakdown. The approach used is that of magnetohydrodynamics, the electrons and holes being treated as a plasma "gas" embedded in the dielectric of the semiconductor.

This approach is unique in the following respects:

1. This is the first attempt to explain second breakdown in terms of magnetohydrodynamics.
2. This is the first time an explanation of pinching in a solid at room …

Joining Graphite To Graphite With Transition Metal Foils, Donald James Sandstrom

Chemical and Biological Engineering ETDs

A study has been undertaken to determine the relationship of metallic-foil joining and joining parameters to the strength of joints in a high-quality extruded nuclear graphite. The materials chosen for investigation as joining materials on the graphite of interest were considered to be representative of the Group IVA, VA, and VIA transition metals and iron. The parameters used for joining yielded either a fully diffused joint, which was not temperature-limited with respect to service conditions or a continuous-carbide-interface joint, which was temperature -limited. The metal chosen from Group IVA for joining was zirconium in the form of 0.0005 in. -thick …

Mass Transfer Of Oxygen In Sodium Cold Traps, Charles Clellan Mcpheeters

Nuclear Engineering ETDs

Cold traps have been used extensively for controlling oxygen concentration in sodium systems. Cold traps utilize the positive temperature dependence of the solubility of sodium monoxide in sodium and the resultant precipitation of sodium monoxide at low sodium temperatures. Sodium monoxide precipitation is here assumed to be heterogeneous because of the strong effect of surface area on the precipitation rate shown in previous packless cold trap experiments. Growth of crystals from a super-saturated solution is said to proceed according to the equation

where dm/dt is the rate of mass accumulation on the crystal, k is an over-all mass transfer coefficient …

An Experimental Study Of Soil-Structure Interaction, Stephen Connally Mitchell

Civil Engineering ETDs

Experimental data obtained from a series of static arching tests run on vertically oriented rigid-base cylindrical structures buried in a partially saturated low plasticity soil are presented. The experimental results are compared to an available analytical approach. The axial stiffness of the structure, the confined tangent modulus (stiffness) of the soil, and the applied surface overpressure were varied. The most important measurement in this experimental study was the total load carried by the structure for different values of structural stiffness and soil stiffness. The index properties, as well as the shear strength and angle of internal friction for the soil …