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Articles 7921 - 7950 of 7987
Full-Text Articles in Physical Sciences and Mathematics
An Algorithm For The Inversion Of Finite Hankel Matrices, William Trench
An Algorithm For The Inversion Of Finite Hankel Matrices, William Trench
William F. Trench
No abstract provided.
How To Measure The Capacity Of Farm Dams, G Gauntlett
How To Measure The Capacity Of Farm Dams, G Gauntlett
Journal of the Department of Agriculture, Western Australia, Series 4
AT some time or another nearly every farmer needs to be able to measure the capacity of an ordinary farm dam of the "excavated earth tank" type and many requests are made for a method of calculating this volume.
This article describes how this can be done.
A Study Of Certain Conservative Sets For Parameters In The Linear Statistical Model, Roger Alan Chapin
A Study Of Certain Conservative Sets For Parameters In The Linear Statistical Model, Roger Alan Chapin
Masters Theses
"In the case of the linear statistical model, it has been shown that under certain conditions the confidence intervals obtained by considering the parameters one at a time are conservative when used as a joint confidence region, using the product of confidences as the confidence. However, nothing had been known of how conservative they are. This research provides accurate estimates of the true confidence for these cases.
Also, it has not yet been proved that they are indeed conservative for all cases. It is thought that they are, and the results of this research support this conjecture"--Abstract, page ii.
Comparison Of Methods To Select A Probability Model, Howard Lyndal Colburn
Comparison Of Methods To Select A Probability Model, Howard Lyndal Colburn
Masters Theses
"A comparison is made between the estimates of the parameters in a gamma distribution obtained by the method of moments with those obtained by a numerical approximation to the maximum likelihood estimates. The estimates obtained by the numerical approximation had a smaller mean squared error from the true value than the estimates obtained by the method of moments. Modifications to tests of fit are made in order to develop methods to select a distribution from a set of possible distributions for a population with an unknown distribution. These selection methods are compared in their ability to make correct selections. Although …
Latent Class Analysis And Information Retrieval, George Loyd Jensen
Latent Class Analysis And Information Retrieval, George Loyd Jensen
Masters Theses
"Information retrieval may be defined roughly as a procedure to either locate or physically retrieve a document or documents containing information on a given topic with a high degree of reliability. Information retrieval is one of the newest fields in computing science. Being so new there are many unexplored areas. The research that has been done has not been standardized beyond the point of the effort which has been slanted toward solving the "Library Problem" ... Several different information retrieval methods have been suggested and some research done on them to try and solve the "Library Problem". Of these methods …
Tschebyscheff Fitting With Polynomials And Nonlinear Functions, George F. Luffel
Tschebyscheff Fitting With Polynomials And Nonlinear Functions, George F. Luffel
Masters Theses
"It is the purpose of this study to survey the properties of the Tschebyscheff polynomials with particular reference to how they are employed as approximants and interpolants. The survey is extended to include the process known as "Tschebyscheff Approximation" or "Tschebyscheff Fitting" of a function by functions other than polynomials. One such fitting technique which will be of particular interest in this study is that of fitting f(x) by the function abx + c where a, b, c are real and b ≠ 1. In addition to a survey of the properties of the Tschebyscheff polynomials and of Tschebyscheff …
Linear And Quadratic Programming With More Than One Objective Function, William John Lodholz
Linear And Quadratic Programming With More Than One Objective Function, William John Lodholz
Masters Theses
"A computational procedure is presented for determining optimal solutions to the linear and quadratic programming problem when there is more than one objective function subject to linear constraints. In general a unique solution does not exist and a set of "best" or "efficient" points is determined and presented in graphical or tabular form. To solve the mathematical programming problems the simplex method is used for linear objective functions and Wolfe's method is used for quadratic objective functions"--Abstract, page ii.
On The Extrapolation Of A Special Class Of Stationary Time Series, William F. Trench
On The Extrapolation Of A Special Class Of Stationary Time Series, William F. Trench
William F. Trench
No abstract provided.
A Development Of The Number System, Janet R. Olsen
A Development Of The Number System, Janet R. Olsen
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
This paper is based on Landau's book "Foundations of Analysis" which constitutes a development of the number system founded on the Peano axioms for natural numbers.
Dynamic Programming Model For Strategic Materials, A, Franklin R. Shupp
Dynamic Programming Model For Strategic Materials, A, Franklin R. Shupp
About Harlan D. Mills
No abstract provided.
Estimation And Tabulation Of Bias Coefficients For Regression Analysis In Incompletely Specified Linear Models., Harry Kerry Edwards
Estimation And Tabulation Of Bias Coefficients For Regression Analysis In Incompletely Specified Linear Models., Harry Kerry Edwards
Masters Theses
"There is often some uncertainty as to the exact number of predictors to include in the specification of the linear model when the theory of regression analysis is applied to specific data. To aid the experimenter in defining the correct number of predictors, a bias function that estimates the deviation of a linear model from the true model has been defined.
The writer has derived an accurate, economical, numerical method for calculating the bias function associated with an incompletely specified linear model and has tabulated bias function coefficients for a reasonable number of doubtful predictors"--Abstract, page ii.
A Study Of Methods For Estimating Parameters In The Model Y(T) = A₁E-P₁T + A₂E-P₂T + Ε, Gerald Nicholas Haas
A Study Of Methods For Estimating Parameters In The Model Y(T) = A₁E-P₁T + A₂E-P₂T + Ε, Gerald Nicholas Haas
Masters Theses
“In this study, methods for estimating the unknown parameters A1, A2, p1, and p2 in the model
y(t) = A1e-p1t + A2e-p1t + ϵ
where ϵ ~ N(0, σ) are investigated. In the model investigated, A1, A2, p1, and p2 are positive.
Four methods, one non-iterative method and three iterative methods, for estimating parameters in this model are investigated. The non-iterative method is known as Prony's Method. The three iterative methods are (1) the Modified Gauss …
Improving A Method For Numerical Construction Of Wave Rays, W. Stanley Wilson
Improving A Method For Numerical Construction Of Wave Rays, W. Stanley Wilson
Dissertations, Theses, and Masters Projects
Steps in wave-ray construction are as follows:
1) Select wave periods and approach angles for each series of rays to be constructed.
2) Prepare a grid of depth values for the area of investigation.
3) Use a computer program to obtain a table of water depths and related wave velocities for each wave pe:r.'iod selected in (1).
4) Make a grid of wave-velocity values for each wave period selected in (1), for the area of investigation, using a second computer program which takes as input the depth grid of ( 2) and tho appropriate depth-velocity table of (3).
5) Derive, …
The Effect Of Matrix Condition In The Solution Of A System Of Linear Algebraic Equations., Herbert R. Alcorn
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 …
A Method To Give The Best Linear Combination Of Order Statistics To Estimate The Mean Of Any Symmetric Population, Robert M. Smith
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 …
An Algorithm For The Inversion Of Finite Toeplitz Matrices, William F. Trench
An Algorithm For The Inversion Of Finite Toeplitz Matrices, William F. Trench
William F. Trench
No abstract provided.
Stochastic Income Model Using Optimal Inventory Rules, A, Daniel Orr
Stochastic Income Model Using Optimal Inventory Rules, A, Daniel Orr
About Harlan D. Mills
No abstract provided.
Some Properties Of Certain Sets Of Coprime Integers, Roger C. Entringer
Some Properties Of Certain Sets Of Coprime Integers, Roger C. Entringer
Mathematics & Statistics ETDs
The set P(n) of all primes equal to or less than n has the obvious property that it contains exactly one multiple of each prime equal to or less than n. We use this partial description of P(n) as a basis for the following
Definition 1.1. An increasing sequence {a1,...,ak} of integers greater than 1 is a coprime chain if it contains exactly one multiple of each prime equal to or less than ak.
Convergence Functions And Their Related Topologies, Darrell C. Kent
Convergence Functions And Their Related Topologies, Darrell C. Kent
Mathematics & Statistics ETDs
A convergence function is a correspondence between the filters on a given set S and the subsets of S which specifies which filters converge to which points of S. This concept is defined to include types of convergence which are more general than that defined by specifying a topology on S. Thus a convergence function may be regarded as a generalization of a topology.
Topological Groups, Nicolas Anthony Thireos
Topological Groups, Nicolas Anthony Thireos
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
A topological group is an abstract group which is also a topological space and in which the group operation are continuous. In group theory the algebraic binary operation of passage to a limit is studied in a similar manner. The two fundamental mathematical concepts of binary operation and passage to a limit are united and interrelated in the concept of topological group.
The concept of topological groups arose from the study of continuous transformations. However, topological groups can be studied quite independently from continuous transformations and the latter can be presented as applications of topological groups. The first person to …
Investigation Of The Properties Of The Iterations Of A Homeomorphism On A Metric Space, Murray B. Peterson, Jr.
Investigation Of The Properties Of The Iterations Of A Homeomorphism On A Metric Space, Murray B. Peterson, Jr.
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Considerable study has been made concerning the properties of the iterations of a homeomorphism on a metric space. Much of this material is scattered throughout the literature and understood solely by a specialist. The main object of this paper is to put into readable form proofs of theorems found in G.T. Whyburn's "Analytic Topology" pertaining to this topic in topology. Properties of the decomposition space of point-orbits induced by the iterations of a homeomorphism will compose a major part of the study. Some theorems will be established through series of lemmas required to fill in much of the detail lacking …
Reliability: Management, Methods And Mathematics, David K. Lloyd, Myron Lipow
Reliability: Management, Methods And Mathematics, David K. Lloyd, Myron Lipow
The Harlan D. Mills Collection
No abstract provided.
Simulation In Economics And Business, Daniel Orr
Simulation In Economics And Business, Daniel Orr
About Harlan D. Mills
No abstract provided.
A Modified Algorithm For Henrici's Solution Of Y' ' = F (X,Y), Frank Garnett Walters
A Modified Algorithm For Henrici's Solution Of Y' ' = F (X,Y), Frank Garnett Walters
Masters Theses
"The purpose of the present study is to discuss the boundary value problems leading to equations exemplified by the four equations previously mentioned and to write a program for an I.B.M. computer in Fortran II language as a contribution to the numerical solution of an important class of linear and nonlinear differential equations"--Introduction, page 4.
Investigation Of Measures Of Ill-Conditioning, Thomas D. Calton
Investigation Of Measures Of Ill-Conditioning, Thomas D. Calton
Masters Theses
“The object of investigation in this study is that of ill-conditioning in the solution of a system of linear equations. Ill-conditioning arises when the solution is very sensitive to small changes in the coefficients of the unknowns.
A study is made in this paper of the various proposed measures of ill-conditioning for the purpose of finding the most practical method or measure for determining whether a system is ill-conditioned.
The problem of near-singular or ill-conditioned systems is of great importance in the solution of linear systems because of the extensive use made of them in practical situations. Solution of a …
On The Initial Value Problem For The Quasi-Linear Parabolic Partial Differential Equation, Henry Hermes
On The Initial Value Problem For The Quasi-Linear Parabolic Partial Differential Equation, Henry Hermes
Mathematics & Statistics ETDs
In this paper we consider second order parabolic partial differential equations on the infinite strip. We confine our attention to the quasi-linear equations, and in particular, the problem
(0-1) u͙(t,x) = f(u)uxx(t.x) , (t,x) ε(0,T)x(-∞,∞) ≡ DT, T>0
u(0,x) = u0(x) , x ε (-∞,∞).
Existence, uniqueness and properties of the solution are discussed. These results can be immediately generalized to problems where the differential equation is of the form u͙(t,x) = f(t,x,u)u xx(t,x).
Select On Fleece Weight And Cull The Low Producers, W L. Mcgarry
Select On Fleece Weight And Cull The Low Producers, W L. Mcgarry
Journal of the Department of Agriculture, Western Australia, Series 4
EFFICIENT calling of maiden ewes before they join the breeding flock is an essential part of any policy of flock improvement.
Removal of the low wool producers should be one of the first considerations when culling the flock.
A Generalization Of The Rayleigh Distribution, Ruth H. Lemon
A Generalization Of The Rayleigh Distribution, Ruth H. Lemon
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
This papers is divided into numbered sections. The equations are numbered anew in each section, and equation numbers are always enclosed in parentheses. Merely the equation number is given when referring to an equation in the same section as the references; otherwise the section number is prefixed. Thus equation (4) refers to the fourth equation of the same section as the reference, and equation (2.2) refers to the second equation of the second section.
Smoothing In Servo Processes, Harlan D. Mills
Smoothing In Servo Processes, Harlan D. Mills
The Harlan D. Mills Collection
No abstract provided.
A General Class Of Discrete Time-Invariant Filters, William F. Trench
A General Class Of Discrete Time-Invariant Filters, William F. Trench
William F. Trench
No abstract provided.