Digital Commons Network^™

Optimum Zero-Memory Nonlinear Filter, Benjamin Shaw-Hu Wang

Masters Theses

“The purpose of this report is to review the basic work described by Zadeh insofar as systems of class N₁ are concerned and to apply his general results to a specific problem in which a non-linear filter is mandatory simply because the linear filter is essentially ineffective. The ineffectiveness stems from the fact that the autocorrelation function of the signal plus the noise has essentially the same variational character as the signal alone. Therefore, the transfer function of the linear filter turns out to be simply a constant. Thus, the output of the linear filter is just an attenuated …

Investigation Of Zero Sidesway For Rigid Frames, Dolatray S. Mehta

Masters Theses

"This study was made to determine the location of a point at which a vertical load may be applied to a rigid frame structure and produce zero sidesway, the so called zero sidesway axis. For concentrated loads equations have been derived for zero sidesway. For uniform and triangular loads graphs showing zero sidesway for various ratios of column and beam stiffnesses and height ratios have been plotted"--Abstract, page ii.

Compensator Design For Unity Feedback Systems Using An Analytical Method, Chang-Yu Wu

Masters Theses

“In control systems engineering it is frequently necessary to compensate a fixed plant whose transfer function cannot be changed. Usually the characteristics of the resulting system are established in terms of steady-state and transient performance specifications. Generally it is necessary to insert a compensator which insures stability as well as satisfies the specifications.

In this thesis an analytical method is developed to determine the transfer function of the compensator in order to satisfy the following set of specifications. The fixed system is assumed to contain one non-linearity, saturation. The input to the saturable device is constrained in a statistical …

The Design, Construction, And Evaluation Of A Vortex Stabilized Plasma Generator, Ronald Ray Williams

Masters Theses

“This report presents the design, construction, and evaluation of a vortex stabilized arc plasma generation facility operating on argon.

The facility consisted of five basic systems; the plasma genera- tor, the electrical power system, the argon flow system, the cooling system, and instrumentation.

The facility was designed to meet four general requirements; stable arc operation, low electrode deterioration, low cost of construction, and provisions for determination of the operating characteristics and thermal properties of the plasma.

Experimental results obtained in the laboratory agreed well with the design conditions. The rate of energy dissipated in the electric arc varied from 7. …

Effect Of Poly-Ethylene Glycol, A Non-Shrinking Agent, On Strength Properties Of Concrete., Vasantrai Vallabhbhai Desai

Masters Theses

"This thesis describes laboratory test made on plain concrete cylinders and ~earns for compressive strength, flexural strength, durability and shrinkage, using poly-ethylene glycol (ElOOO) as a non-shrinking admixture. The tests were conducted in the Materials Laboratory of the Civil Engineering Department.

The test results show that poly-ethylene glycol has the effect of reducing the compressive and flexural strength of plain concrete. The admixture also has the effect of reducing shrinkage, and reversing it, causing expansion with large percentage of its use. For the number of cycles of alternate freezing and thawing reported the admixture did not have any effect on …

Artifact Filter., Kent William Swearingen

Masters Theses

"Peripheral blood pulse monitors are highly susceptible to noise-artifact-- in their present stage of development. The purpose of this thesis is to demonstrate a feasible means for filtering the artifact, using existing monitors. Since no peripheral pulse monitor (transducer) was available for experimentation, a simulated test input was devised with frequency variations from JO cycles/minute to 1.50 cycles/minute.

The filtering circuit predicts the time location of each input pulse. The location of the prediction is governed by the accuracy of the preceding prediction. This is controlled by an R-C timing circuit with a Schmitt Trigger and relay.

From the data …

The Effect Of Matrix Condition In The Solution Of A System Of Linear Algebraic Equations., Herbert R. Alcorn

Masters Theses

"The solution of a system of linear non-homogeneous equations may contain errors which originate from many sources. A system of linear equations in which small changes in the coefficients cause large changes in the solution is unstable and the coefficient matrix is ill- conditioned .

The purpose of this study is to define several measures of matrix condition and to test them by correlation with a measure of the actual errors introduced into a system of equations.

The study indicates that three of the five measures of condition tested were reliable indices of the magnitude of error to expect in …

Solid-Phase Welding Of Nodular Iron To Low Carbon Steel., Scott H. Carriere

Masters Theses

“This paper presents an experimental investigation of the possibility of using solid-phase welding to join nodular iron to low carbon steel. Included is a review of available literature on solid-phase welding, tracing its origin from early Egypt to the present day. There was no previously reported work found on the welding of nodular iron to steel.

Experiments were performed to determine what temperature-pressure combination gave the greatest ultimate tensile strength These experiments resulted in the best welds being produced with an end load of 7000 pounds (35.700 psi) on a half inch diameter sample. The majority of these welds proved …

The Importance Of Radiation As A Means Of Controlling Surface And Internal Temperatures Of A Semi-Infinite Solid, Kenneth C. Woodruff Jr.

Masters Theses

"This problem is concerned with the temperature history of a semi-infinite solid bounded by one flat surface.

Heat was applied by convection from a hot fluid to the flat surface of the solid which was originally at a uniform temperature. Heat was radiated from the flat surface to black space and conducted into the solid according to Fourier's law. The temperature at the surface, and at several points beneath the surface, was determined as a function of time.

A method for solution of such a problem is demonstrated here by the use of numerical analysis and the Royal McBee LGP …

A Determination Of The Theoretical Stresses In A Deep Beam., James William Tritz

Masters Theses

"This paper presents an analytical solution of the stress distribution in a deep beam of finite length. The beam being considered is analyzed as one of plane stress. The method employed superimposes two stress functions each of which is a trigonometric series. The first stress function satisfies all boundary conditions except that of zero stress on the vertical faces. The second function is found, so that, when combined with the first function, all boundary conditions are satisfied. The IBM 1620 digital computer is then used to find the stresses for a particular beam. The results of this analysis are then …

Investigation Of The Effect Of The Wall Thickness On The Residual Stresses Developed In Thick Wall Cylinders Due To Water Quenching From The Outside Surface., Ghanshyam Chandubhai Patel

Masters Theses

"This investigation has been made to determine the residual stresses in thick wall cylinders by the use of strain gages.

The cylinders were quenched from their outer surface i n water from a temperature of 1000°F, and the resulting residual stresses were determined by Sachs boring-out method. The effect of the wall thickness of the cylinders on the residual stresses and the error developed due to the boring operation were discussed"--Abstract, p. ii

Solid Solubility Of Sodium Oxide In Tricalcium Aluminate, Joel A. Conwicke

Masters Theses

"The tie line connecting the compounds 3CaO·Al₂O₃ and Na₂O·8CaO·3Al₂O₃ in the ternary system CaO-Al₂O₃-Na₂O was studied at 1250° Celsius.

It was determined that Na₂O can exist in crystalline solution with 3CaO·Al₂O₃ in percentages of about 2.3% or less without any apparent change in the structure of 3CaO·Al₂O₃. X-ray diffraction peaks in the back-reflection region shifted to lower d-spacing values on increasing Na₂O contents.

At a Na₂O content of about 2.7%, each major x-ray …

Application Of An Orifice Meter To Fan Testing., J. F. T. Agapito

Masters Theses

"In this investigation the application of an orifice meter to fan testing was studied and evaluated. An orifice meter was designed and was installed in a centrifugal fan duct. Measurements were checked and compared with those of a standard pitot-tube traverse and were found to be in very close agreement. It is suggested that a meter of this type could easily be adapted not only to laboratory work but also to field tests"--Abstract, p. ii

The Dielectric Properties Of Thallium Nitrate., Gene E. Gowins

Masters Theses

"The purpose of this research was to investigate the dielectric behavior of thallous nitrate and to determine whether it belongs to space group Pbnm or to Pbn2.

The growing of single crystals of thallous nitrate which are suitable for dielectric measurements is difficult because the crystals are prone to initiate a dendritic growth habit. In the present work single crystals of thallous nitrate were obtained, however, by slow evaporation of an aqueous solution at 55 degrees centigrade. The crystals were plates, not larger than 8 x 8 x 2 mm, whose principal faces were subsequently indentifled as (001) planes. The …

A Method To Give The Best Linear Combination Of Order Statistics To Estimate The Mean Of Any Symmetric Population, Robert M. Smith

Masters Theses

“This paper gives a distribution for the ratio of two non-independent normally distributed random variables. The random variables involved are jointly distributed as the bivariate normal with means zero and variance- covariance matrix V.

The sample mean and one-half the sum of the smallest and largest sample observations from the symmetrically truncated Cauchy density function are compared as estimates of the mean of this density function. The reason for this comparison is to determine which of these two estimators gives the best estimate of the mean.

A method to empirically determine the best linear combination of order statistics for any …

Effect Of Hydroxyethyl Cellulose On Properties Of Concrete At Early Ages., Vipinchandra R. Shah

Masters Theses

"In this investigation, hydroxyethyl cellulose was used as an admixture in plain concrete. The admixture was tested for its effect on the compressive strength of plain concrete cylinders and for its effect on the flexural strength of plain concrete beams. Specimens were also tested for freeze-thaw durability and shrinkage.

The test results indicated that hydroxyethyl cellulose has the effect of increasing the compressive strength and decreasing the flexural strength of plain concrete. The rapid freezing and thawing tests showed that the durability increases with increase in amount of admixture.

The tests were carried out in the Materials Laboratory of the …

The Effect Of Surface Roughness, Cure Pressure, And Temperature Level On The Thermal Resistance Of Bonds And Contacts, David Leo Schwaller

Masters Theses

"This investigation was conducted to determine the thermal effect of temperature level, surface roughness, and curing pressure on bars and bonded interfaces.

The equipment used in this investigation is shown in Fig. 1 and Fig. 2. The four specimens used, cylindrical aluminum alloy bars, were cut radially at their midpoints and faced on a lathe. Heat was supplied by an electrical resistance heating element and an ice bath was used to conduct heat from the alloy specimen. A heat shield was used to insure one dimensional heat flow. Spacers were placed in the insulation at the top, the interface, and …

The Effect Of Plastic Deformations On Grain Boundaries., Jayendra Jamnadas Shah

Masters Theses

"The purpose of this study is to determine the effect of the plastic deformations on the grain boundaries and the grain structure of mild steel. Five beams tested were of A-36 steel and of 6 WF 20 rolled section. Central loading was used to develop a plastic tinge at the cent1:1r.

At the center, where a plastic hinge was formed, the effect of the plastic deformations on the grain structure was severe in all the samples taken from the tension side of all plastically or partially plastically loaded beams. In fully plastically loaded beams this effect had spread on both …

Effect Of Internal Pressure On Compressive Buckling Stress Of A Cylindrical Shell Under Eccentric Loading, Chao-Ping Chu

Masters Theses

“In this paper, an investigation was made of a thin- walled cylindrical shell under compressive load with various eccentricities and internal pressures to study the effect of the internal pressure on the compressive buckling stress of the shell.

So far, theoretical methods have not been devised to solve this problem; therefore, an experimental study was carried out. The experimental results indicated that the buckling load of the shell decreases as the eccentricity increases, that the buckling stress increases as the eccentricity increases, and that the change in buckling stress increases with an increase of internal pressure and is very nearly …

The Effects Of Granular Size On The Thermal Conductivity Of Fine Sand, Fikri Yalvac

Masters Theses

"The Thomas method (1) for determining the thermal conductivity of solid materials can be used for the determination of the thermal conductivity of granular materials. In this thesis this method has been used to determine the effect of the granular size of sand cn its thermal conductivity.

River sand was classified according to size by the Tyler Standard Screen Scale into 50-60, 50-80, 80-100, 100-200, and below 200 mesh size. These sands were used for the experiments. The clay was separated from these samples to obtain pure river sand for the experiments.

According to the International Critical Tables, the thermal …

Compaction Characteristics Of Fine Grained Soils., Lewis Clyburn Sowell

Masters Theses

"The existing theories of compaction of soi Is are reviewed. The effect of varying the compactive effort on dry density, optimum moisture content, and compressive strength for three fine grained soils is investigated. These samples consist of si I ty clay (CL), plastic clay (CH), and loess (ML). The test results indicate that compactive effort has an important effect on the shape of the moisture density curve and that a potential for over compaction increases with a higher plastic index and c l ay content. At water contents above the Standard AASHO optimum value, the compressive strength is not appreciably …

Dropouts And Their Relationship To Guidance, Darrell Lower

Masters Theses

No abstract provided by author.

The Indole Acetic Acid Oxidase Of Hygrophorus Conicus., Dilip N. Patel

Masters Theses

"The purpose of this investigation was to determine an assay method for measuring the activity of the indole acetic acid oxidase present in Hygrophorus conicus. This enzyme converts tryptamine or indole acetic acid (IAA) into oxindole acetic acid (OIAA).

An assay method for measuring the activity of the enzyme was developed based on the spectrophotometric measurement of tryptamine, IAA, and OIAA. Several other assay methods were tried. The colorimetric method of Gordon and Weber ^(l4) was found to be useful for a quantitative determination of IAA and was insensitive to OIAA. Paper chromatography proved to be useful as a qualitative …

Time Optimum Switching Zones In Multiple-Valued Control Systems, Jack Leroy Crawford

Masters Theses

"Present control system theory provides the criteria necessary to bring a second-order single-valued system to rest in a minimum time after a step input. The bang-bang type controller has been developed to obtain this optimum response.

However, existing theory fails to provide the necessary information to obtain the optimum response from a second-order rotational system when multiple values of angular position are allowed. This thesis extends the control theory to include these multiple-valued systems by showing the existence of what are called optimum switching zones. These zones predict which of the infinite number of switching curves in a multiple-valued system …

Generalized Programs For Heat Transfer Analysis., Ceylung Chu

Masters Theses

"This report presents numerical methods for calculating temperature distributions in any physical system in which heat transfer is taking place. The syste.11 may be at either a steadystate condition or a transient condition. The temperature distribution may itself be or primary interest, or it may be used further to calculate the flow or heat or thermal stress.

The system under investigation is divided into a certain number of subdivisions, or so-called "regions". A reference point (node point) will be taken as representative for the region which includes that point. The temperature at the "node point11 is taken to be the …

Optimalization By Peak-Holding, Curtis W. Dodd

Masters Theses

"The problem presented is a study of the peak-holding method of optimalization. This method applies to a system that has an extremum.

After describing how the complete system, consisting of the controller and the controlled system, works; variations in the controller are presented. These variations are changes in the final stage of the controller, the servo. A phase-plane analysis shows how the output of the controlled system varies with its rate of change. Limitations are presented which tell why the system cannot be kept at its peak value at all times. Finally an analog simulation is used to study the …

A Study Of A Method For Selecting The Best Of Two Or More Mathematical Models, August J. Garver

Masters Theses

"A method for selecting the best in some sense of two or more mathematical models is investigated in this study. The method is that of using part of the data to estimate parameters and using the resulting equation to predict the additional data which are then compared with the existing data not used in estimating the parameters. In particular the effects produced on the method by the number and location of points used in estimating the parameters and the criterion for determining the best fit are investigated. It was concluded from the results of an empirical investigation that the success …

Determination Of Transient Temperature Stresses In Plates, Teh Yu Hu

Masters Theses

“The purpose of this thesis is to determine the transient temperature stresses in two-dimensional plate structures restrained against rotation at the ends but not restrained against elongation. In this investigation, only one-dimensional heat flow is considered. The heat flow is first treated as a problem in pure conduction and then the effects of convection through a boundary layer are considered.

The differential equation of transient heat conduction is solved by Fourier series and Duhamel’s theorem, and a graphical method of solution for temperatures in terms of dimensionless parameters is presented.

Solution of this problem is valid for a semi-infinite plate …

The Effect Of Gymnastic Routines On Blood Pressure And Pulse Rate, Robert Ferguson

Masters Theses

No abstract provided.

A Comparison Of The High School Preparation Of 1956 Freshmen And 1962 Freshmen At Eastern Illinois University, Donn W. Hammer

Masters Theses

No abstract provided by author.