24,415 research outputs found
Jack Alive / Martin Dead : The Location of the "Author" in Jack London\u27s Martin Eden
No full textThis essay is an attempt to read Martin Eden, Jack Londonʼs autobiographical novel, in terms of the inextricable relationship between the author and the protagonist. Critics have often taken the unbalanced plot and the lack of ironic distance between narrator and character in Martin Eden as the technical weakness of London, but this paper argues that the achievement of this novel owes a great deal to the attachment of London to Martin. The unbalanced structure is a necessary product of the severe struggle of the author to kill his romantic alter ego. // Martin, who aspires to win Ruth Morse, tries to cross class boundaries by making a career of a writer. Even after realizing the emptiness of Ruth, who turns out to be nothing but a typical figure of the bourgeoisie, he somehow persists in loving her. The notion underlying here is that, for Martin, love, career and art are fundamentally inseparable. He objects to the aestheteʼs view of Brissenden on account of his separation of art from career. Martinʼs identity and life consist only in the triunity of love/career/art; the alternative is the repudiation of life. Thus, the unnatural delay of his disappointment in love can be regarded as Londonʼs strategy to set the suicide of Martin as the necessary consequence of the story. // By finishing the story and killing Martin, London finally detaches himself from Martin, reconstructs his self, and, unlike Martin, survives as a professional writer. In this sense, Martin Eden is a story about “writerʼs self-reconstruction.
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Letter from Martin Chizzick
No full textCongratulations to Duane Pearsall for receiving the Enterpreneur of the Year award; note on the letter was written by Pearsall and it mentions that Martin, the author of the letter, died in a airplane accident
Robert Martin Tiffin's Mystery Man Newspaper Articles
No full textAdvertiser-Tribune newspaper clippings featuring a story about Robert Martin (written by Nancy Kleinhenz), a local author from Tiffin (Ohio) who wrote under the pseudonym of Lee Roberts, and two of his short stories. Martin wrote mystery novels in his spare time, creating more than 22 mystery novels. For more information about Robert Martin and a list of books go to http://www.mysteryfile.com/RMartin/JBennett.html
Optimal boundary control and boundary stabilization of hyperbolic systems
No full textThis brief considers recent results on optimal control and stabilization of systems governed by hyperbolic partial differential equations, specifically those in which the control action takes place at the boundary. The wave equation is used as a typical example of a linear system, through which the author explores initial boundary value problems, concepts of exact controllability, optimal exact control, and boundary stabilization. Nonlinear systems are also covered, with the Korteweg-de Vries and Burgers Equations serving as standard examples. To keep the presentation as accessible as possible, the author uses the case of a system with a state that is defined on a finite space interval, so that there are only two boundary points where the system can be controlled. Graduate and post-graduate students as well as researchers in the field will find this to be an accessible introduction to problems of optimal control and stabilization
Stabilisierung des Gasflusses in Netzwerken: Feedbackstabilisierung quasilinearer hyperbolischer Systeme auf Netzwerken mit Randsteuerungen
Get PDFWe study the stabilization of quasilinear hyperbolic PDE systems on networks. To do so we develop stabilizing boundary feedback controls. We study feedback controls without and with time-varying delays. To analyze the system evolution we introduce strict Lyapunov functions which are weighted and squared L2- and H1-norms of the solutions of the quasilinear systems. The exponential weights in the Lyapunov functions contain the system eigenvalues. The feedback controls with time delay are represented by delay terms in the Lyapunov functions. The boundary controls yield an exponential decay of the corresponding Lyapunov function on a given finite time interval. Furthermore, we prove the exponential decay of the L2- and H1-norms of the solutions and give exponential estimates for the C0- and C1-norms. We apply our results on the stabilization of the isothermal Euler equations with friction, a hyperbolic system of balance laws that models the gas flow through pipes. For this system we analyze stationary states and classical nonstationary solutions. We present methods to stabilize the isothermal Euler equations locally around a given stationary state both on a single pipe and on fan-shaped pipe networks with compressor stations.In dieser Arbeit beschäftigen wir uns mit der Stabilisierung von quasilinearen hyperbolischen partiellen Differentialgleichungen auf Netzwerken. Für die Stabilisierung verwenden wir Feedbackrandsteuerungen mit und ohne zeitabhängigen Verzögerungen. Um die zeitliche Entwicklung der Lösungen der Differentialgleichungen zu untersuchen, benutzen wir quadrierte L2- und H1-Normen als Lyapunovfunktionen. Die Lyapunovfunktionen besitzen exponentielle Gewichte, welche die Systemeigenwerte enthalten. Die Feedbacksteuerungen mit Verzögerung werden durch Zusatzterme in den Lyapunovfunktionen berücksichtigt. Die Feedbacksteuerungen bewirken den exponentiellen Abfall der Lyapunovfunktionen auf einem vorgegebenen endlichen Zeitintervall. Für die Lösungen der Differentialgleichungen zeigen wir außerdem den exponentiellen Abfall der L2- und H1-Normen und leiten exponentielle Abschätzungen für deren C0- und C1-Normen her. Wir wenden unsere Ergebnisse auf die Stabilisierung des Flusses in Gasröhren an. Dieser wird durch die isothermen Eulergleichungen mit Reibung, einem hyperbolischen System von Bilanzgleichungen, modelliert. Für dieses System untersuchen wir die Existenz und das Verhalten von stationären und klassischen nichtstationären Zuständen. Wir entwickeln Methoden zur Stabilisierung der isothermen Eulergleichungen in einer Umgebung eines vorgegebenen stationären Zustandes. Dabei betrachten wir sowohl den Gasfluss durch einzelne Röhren als auch durch fächerförmige Netzwerke mit Verdichteranlagen
Optimierung auf Gasnetzwerken unter stochastischen Randdaten
Get PDFWe consider the gas dynamics on networks modeled by the isothermal Euler equations.
The demands of the customers at the exits of the network
represent a mass flow boundary condition. The true demands are not
exactly known and are modeled by probability distributions.
First, the stationary solutions of the quasilinear isothermal Euler
equations are derived on a single pipe. For this purpose, a real gas model is used.
Important monotonicity properties of the solution, which are of crucial
importance for the extension to networks, are shown. The existence theory
is developed in a more general framework for flow problems on networks.
This makes it possible to treat different coupling conditions at the nodes
and to use various models that are not necessarily restricted to gas, or
active elements along the edges.
For the optimization, the uncertain boundary conditions are represented
by means of chance constraints. These guarantee that the system is kept
within technical pressure limits with a certain probability. The calculation
of the probability is realized by a combination of quasi-Monte Carlo methods
and the spherical radial decomposition of Gaussian random vectors. For
the gradient-based optimization, a result for a gradient representation is
extended to include the case of convex sets of feasible realizations. It is
shown that, for the case of tree networks, the required assumptions are
fulfilled. For the numerical implementation, a multilevel method is proposed
that uses the solution for low sample numbers as a warm start for the more
complex model. This leads to a significant reduction in computational
time.
In the transient case, the linear wave equation is considered on a single
edge. The initial and boundary data at the end of an interval are uncertain
and given by stochastic processes. The other end of the interval is controlled
by a Neumann feedback law. The stochastic processes are approximated
using the Karhunen-Loève theorem. This enables the representation of
the initial-boundary data by a finite number of random variables. As a
stability measure, the probability to stay below a given threshold in the
L∞-norm, is considered. The system can be stabilized by adjusting the
feedback parameter.Wir betrachten die durch die isothermalen Eulergleichungen modellierte
Gasdynamik auf Netzwerken. Die Abnahme der Kunden an den Ausgängen
des Netzwerks stellt dabei eine Massenfluss-Randbedingung dar.
Die wahren Abnahmen sind jedoch nicht exakt bekannt und werden mithilfe von
Wahrscheinlichkeitsverteilungen abgebildet.
Zunächst werden die stationären Lösungen der quasilinearen isothermalen
Eulergleichungen auf einem Rohr hergeleitet. Dabei wird ein Realgasmodell
zugrunde gelegt. Es werden wichtige Monotonieeigenschaften der Lösung gezeigt,
die für die Erweiterung der Lösung auf Netzwerke von entscheidender
Bedeutung sind. Die Existenztheorie wird jedoch in einem allgemeineren
Rahmen für Flussprobleme auf Netzwerken entwickelt. Damit ist es möglich
unterschiedliche Kopplungsbedingungen an den Knoten sowie verschiedene
– nicht auf Gas eingeschränkte – Modelle sowie aktive Elemente entlang der
Kanten zu behandeln.
Für die Optimierung werden die unsicheren Randdaten mithilfe von
Wahrscheinlichkeitsrestriktionen abgebildet. Diese garantieren, das System mit
einer Mindestwahrscheinlichkeit innerhalb von technischen Druckschranken
zu halten. Die Berechnung der Wahrscheinlichkeit erfolgt mittels einer
Kombination aus Quasi-Monte-Carlo-Verfahren und der sphärisch radialen
Zerlegung von gaußschen Zufallsvektoren. Für die gradientenbasierte
Optimierung wird ein Resultat zur Gradientendarstellung auf den Fall
von konvexen Mengen zulässiger Realisierungen erweitert. Es wird gezeigt,
dass die benötigten Voraussetzungen für den Fall von Baumnetzwerken
erfüllt sind. Zur numerischen Umsetzung wird ein Multilevelverfahren
vorgeschlagen, das mithilfe der Lösung für niedriger Stichprobenzahlen einen
Warmstart für das aufwendigere Modell berechnet. Dies führt zu einer
deutlichen Verringerung der Rechenzeit.
Im transienten Fall wird die lineare Wellengleichung auf einer Kante
betrachtet. Dabei sind die Anfangs- und die Randdaten an einem Intervallende
unsicher und durch stochastische Prozesse gegeben. Das andere Intervallende
wird durch ein Neumannfeedbackgesetz gesteuert. Die stochastischen
Prozesse werden mithilfe des Karhunen-Loève-Theorems approximiert.
Dadurch lassen sich die Anfangsranddaten mit endlich vielen Zufallsvariablen
darstellen. Als Stabilitätsmaß wird dabei die Wahrscheinlichkeit in der
L∞-Norm unterhalb einer gegebenen Schranke zu bleiben betrachtet. Das
System lässt sich durch die Anpassung des Feedbackparameters stabilisieren
Experiences Using Large Scale Video Walls for Distance Education
No full textWe describe our experiences building and using the Rutgers Videowall, a low-cost telepresence system that has been used teaching 15 courses and colloquia. By relaxing typical spatial telepresence features, such as background continuity, we greatly reduced costs and gained flexibility in the rooms it could be deployed in. The lower costs and room flexibility enabled academic departments to use the wall, in contrast to traditional telepresence systems which remained inaccessible. We found that the Videowall’s spatial distortions did not have a significant impact on useability, as our initial survey results show that students had an overall positive experience.Technical report DCS-tr-72
Controllability of a slowly rotating Timoshenko beam
No full textAbstract. Consider a Timoshenko beam that is clamped to an axis perpendicular to the axis of the beam. We study the problem to move the beam from a given initial state to a position of rest, where the movement is controlled by the angular acceleration of the axis to which the beam is clamped. We show that this problem of controllability is solvable if the time of rotation is long enough and a certain parameter that describes the material of the beam is a rational number that has an even numerator and an odd denominator or vice versa
Hans Martin Schwarz Collection 1934 - 1938
No full textThis collection contains clippings of articles by Hans Martin Schwarz (1917, Hamburg – 2006, New York, better known as Martin Ebon), published between 1934 and 1938 in German-Jewish newspapers on a wide variety of subjects such as sports, emigration, the political situation in Germany, and religious attitudes of the young. It also contains reviews of his books "Einer wie Du und Ich" and "Heiteres, Besinnliches, Nachdenkliches."digitizedHans Martin Schwarz (1917, Hamburg – 2006, New York, better known as Martin Ebon), was a journalist and author. In Germany during the 1930s, he published in a variety of German-Jewish periodicals, primarily the Israelitisches Familienblatt. After immigrating to the United States in 1938, he changed his name to Martin Ebon, and published dozens of books in the areas of world affairs and parapsychology.Processe
Interview with Father James Martin
Get PDFIn May 2011, the Ignatian Faculty Scholars at Regis University conducted a Skype interview with Father James Martin, S. J., author of The Jesuit Guide to Almost Everything. The Scholars had used Father Martin’s book as a text for their year of study, which focused on Ignatian Spirituality, the Ignatian Pedagogical Paradigm, and teaching and learning at a Jesuit university. The interview was transcribed and is printed below. Father Martin reflects on the book, and responds to questions about the book itself, about finding God in all learners, and about the Church
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