136 Ergebnisse - Zeige 101 von 120.

This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed w...

Partial differential equations play a central role in many branches of science and engineering. Therefore it is important to solve problems involving them. One aspect of solving a partial differential equation problem is to show that it is well-posed, i. e. , that it has one and only one solution, and that the solution depends continuously on the data of the problem. Another aspect is to obtain detailed quantitative information about the solut...

Keine Beschreibung.

Excerpt from Electrohydrodynamics I: The Equilibrium of a Charged Gas in a ContainerThe constant a in (1) is the ratio of electric charge density to mass density in the fluid. It is constant because we assume that the fluid is uniformly charged. If each molecule of the fluid has mass m and charge e than a e m which is the case when the fluid is an electron gas.About the PublisherForgotten Books publishes hundreds of thousands of rare and class...

Excerpt from Saint Joseph's Help: Or Stories of the Power and Efficacy of Saint Joseph's Intercession It is scarcely necessary to recommend a work, whose only object is to make known the power of St. Joseph's intercession with God, and the wonderful favours obtained through his assistance. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reprod...

Excerpt from Saint Anthony: Ancedotes Proving the Miraculous Power of St. AnthonyAn instance of this may be given When ordered by the Holy See to preach the Lenten sermons at Rome he was perfectly understood by the immense multitude from all nations, whom the renown of his great sanctity and marvellous gifts had attracted. This same gift was of most frequent occurrence during his missionary career.About the PublisherForgotten Books publishes h...

Balthasar Neumann - Artillerie- und Ingenieur-Obrist, fürstlich Bambergischer und Würzburger Oberarchitekt und Baudirektor: eine Studie zur Kunstgeschichte des 18. Jahrhunderts ist ein unveränderter, hochwertiger Nachdruck der Originalausgabe aus dem Jahr 1896. Hansebooks ist Herausgeber von Literatur zu unterschiedlichen Themengebieten wie Forschung und Wissenschaft, Reisen und Expeditionen, Kochen und Ernährung, Medizin und weiteren Genres. ...

Partial differential equations play a central role in many branches of science and engineering. Therefore it is important to solve problems involving them. One aspect of solving a partial differential equation problem is to show that it is well-posed, i. e. , that it has one and only one solution, and that the solution depends continuously on the data of the problem. Another aspect is to obtain detailed quantitative information about the solut...

Excerpt from Wave Propagation in Variable Media Wave propagation is one of the means by which energy travels. 'Propagation' is the process whereby the energy moves from one region of space to an adjacent region, and 'wave' is a general term for a moving spatial distribution of energy. The matter in the region of space through which the propagation occurs is called the transmission medium. A random or stochastic medium is a family of media tog...

Excerpt from Spherical, Cylindrical and One-Dimensional Flows of Compressible Fluids Relatively few boundary value problems involving spherical or cylindrical flows of compressible fluids have been solved exactly. In order to solve more problems of this type, particularly those involving variable entropy, we have investigated the flow differential equations, at first without regard to initial or boundary conditions. In this way a class of non...

Excerpt from Thin Unsteady Heavy Jets The hydrodynamic theory of jets attempts to determine the surfaces of a jet and the detailed velocity distribution within a jet. The main difficulty stems from the nonlinear boundary conditions to be satisfied on the unknown jet surfaces. When the flow is restricted to be two-dimensional and steady, and surface tension is neglected, this difficulty can be overcome by the method of conformal mapping and th...

Excerpt from Reflection and Transmission of Electromagnetic Waves by Thin Curved Shells In order to solve the prohlen it is necessary to obtain, in the oh stacle as well as in the surrounding medium, a solution of Maxwell's equations which satisfies the boundary conditions on the obstacle boundary. This solution must also contain the incident field. For incident plane or spherical waves this last condition can be fulfilled. By requiring the s...

Excerpt from Diffraction by an Aperture I The diffraction of a wave by an aperture of any shape in a thin screen is treated by a new method. This method is called "the geometrical theory of diffraction", because it is an extension of geometrical optics which accounts for diffraction. In this method new rays - called diffracted rays - are introduced. They are produced when an incident ray hits the edge of the aperture, and they satisfy the "la...

Excerpt from Back Scattering From a Finite Cone The back scattering from a finite cone is calculated in this report by means of the geometrical theory of diffraction. Three different physical problems are considered. One is that of an acoustic wave incident upon a rigid cone. The second is that of an acoustic wave incident upon a perfectly soft (pressure-release) cone. The third, and perhaps most important, is that of an electromagnetic wave ...

Excerpt from The Inverse Scattering Problem in Geometrical Optics and the Design of Reflectors: January, 1958 In Fig. 3 this reflector is drawn, using (9) and (10) with the upper sign. Equation (1) can also be used to solve the direct problem of scattering. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical...

Excerpt from Basic Mathematical Investigations in Electromagnetic Wave Theory: Final Report, January 1, 1964 December 31, 1968 This report is a summary of research activities pursued during the period from January 2, 1964 to January 1, 1969 by the Division of Electromagnetic Research of the Courant Institute of Mathematical Sciences at New York University, under Contract Number AF 19(628)3868 with the Air Force Cambridge Research Laboratories...

Excerpt from The Life and Acts of Pope Leo XIII: Preceded by a Sketch of the Last Days of Pius IX. And the Origin and Laws of the Conclave The title-page of this compilation sufficiently indicates its nature, and a preface would be super¿uous were it not the editor's duty to give the public some information in regard to the sources from which he has drawn his materials, and the manner in which the book has been put together. That a book of t...

Excerpt from Derivation of the Bohr-Sommerfeld Quantum, Conditions From an Asymptotic Solution, of the Schroedinger Equation We wish to examine the asymptotic behavior of the of (1) as Planck's constant h approaches zero. To this end we assume that as h approaches zero. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an importa...

Excerpt from The Sacred Heart: Anecdotes and Examples to Assist in Promoting the Devotion to the Sacred Heart Devotion to the Sacred Heart of Jesus consists in honoring His human Heart. This devotion is as old as the Church herself, for it began on Calvary when the soldier's lance pierced the sacred side of our dear Lord. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgotte...

Excerpt from The Scope of the Image MethodThe image method is a method for constructing a Green's function for a part of space bounded by planes in terms of the corresponding Green's function for the full Space. The purpose of this note is the determination of all regions, equations and boundary conditions to Which this method is applicable.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more ...