957 resultados para Stokes, Peter


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Sammelrezension von: 1. Karl-Ernst Jeismann/Peter Lundgreen(Hrsg.): Handbuch der deutschen Bildungsgeschichte. Band III. 1800-1870: Von der Neuordnung Deutschlands bis zur Gründung des Deutschen Reiches. München: Beck 1987, 443 S. 2. Dieter Langewiesche/Hehiz-Elmar Tenorth (Hrsg.): Handbuch der deutschen Bildungsgeschichte. Band V. 1918-1945: Die Weimarer Republik und die nationalsozialistische Diktatur. München: Beck 1989. 470 S.

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Rezension von: David R. Cole (Hrsg.): Surviving Economic Crises through Education. Global Studies in Education, Vol. 11. New York u.a.: Peter Lang 2011 (267 S.; ISBN 978-1433114786)

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Rezension von: Peter Faulstich: Menschliches Lernen. Eine kritisch-pragmatistische Lerntheorie. Bielefeld: transcript 2013 (232 S.; ISBN 978-3-8376-2425-0)

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Rezension von: Christian Efing (Hrsg.): Ausbildungsvorbereitung im Deutschunterricht der Sekundarstufe I. Die sprachlich-kommunikativen Facetten von „Ausbildungsfähigkeit“. Frankfurt am Main: Peter Lang 2013 (371 S.; ISBN 978-3-631-63387-8)

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This dissertation is devoted to the equations of motion governing the evolution of a fluid or gas at the macroscopic scale. The classical model is a PDE description known as the Navier-Stokes equations. The behavior of solutions is notoriously complex, leading many in the scientific community to describe fluid mechanics using a statistical language. In the physics literature, this is often done in an ad-hoc manner with limited precision about the sense in which the randomness enters the evolution equation. The stochastic PDE community has begun proposing precise models, where a random perturbation appears explicitly in the evolution equation. Although this has been an active area of study in recent years, the existing literature is almost entirely devoted to incompressible fluids. The purpose of this thesis is to take a step forward in addressing this statistical perspective in the setting of compressible fluids. In particular, we study the well posedness for the corresponding system of Stochastic Navier Stokes equations, satisfied by the density, velocity, and temperature. The evolution of the momentum involves a random forcing which is Brownian in time and colored in space. We allow for multiplicative noise, meaning that spatial correlations may depend locally on the fluid variables. Our main result is a proof of global existence of weak martingale solutions to the Cauchy problem set within a bounded domain, emanating from large initial datum. The proof involves a mix of deterministic and stochastic analysis tools. Fundamentally, the approach is based on weak compactness techniques from the deterministic theory combined with martingale methods. Four layers of approximate stochastic PDE's are built and analyzed. A careful study of the probability laws of our approximating sequences is required. We prove appropriate tightness results and appeal to a recent generalization of the Skorohod theorem. This ultimately allows us to deduce analogues of the weak compactness tools of Lions and Feireisl, appropriately interpreted in the stochastic setting.

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A fast and accurate numerical technique is developed for solving the biharmonic equation in a multiply connected domain, in two dimensions. We apply the technique to the computation of slow viscous flow (Stokes flow) driven by multiple stirring rods. Previously, the technique has been restricted to stirring rods of circular cross section; we show here how the prior method fails for noncircular rods and how it may be adapted to accommodate general rod cross sections, provided only that for each there exists a conformal mapping to a circle. Corresponding simulations of the flow are described, and their stirring properties and energy requirements are discussed briefly. In particular the method allows an accurate calculation of the flow when flat paddles are used to stir a fluid chaotically.

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Eleven expeditions were undertaken to the Saint Peter and Saint Paul Archipelago to study the reproductive biology of Grapsus grapsus, providing additional information on limb mutilation and carapace colour. MATURE software was used to estimate morphological maturity, while gonadal analyses were conducted to estimate physiological maturity. The puberty moult took place at larger size in males (51.4 mm of carapace length) than in females (33.8 mm), while physiological maturity occurred at a similar size in males (38.4 mm) and in females (33.4 mm). Above 50 mm, the proportion of red males increased in the population, indicating that functional maturity is also related to colour pattern. Small habitat and high local population density contributed to the high rate of cannibalism. The low diversity of food items, absence of predators of large crabs and high geographic isolation are the determinants of unique behavioural and biological characteristics observed in the G. grapsus population.

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The process of ‘labelling’ (whereby labels are socially imposed on a given behaviour by a given person) is an extensive and recurrent one in our society, as proved by the labelling of behaviours and people even into the literary text. In our analysis, we will try to show how applying one of two most different labels (psychopathic or psychotic) greatly influences our understanding of the existence of ‘evil’ or moral responsibility in the deeds of a person. To such end, we will use Peter Shaffer’s play Equus (1973), which requires both the characters in the play and the spectators to decide whether Alan Strang’s terrible crime is a result of evil or of insane behaviour: whether he is ‘mad’ or simply ‘bad’. We will try to evince the current social and cultural confusion between madness and evil, and how processes of medicalization or criminalization affect our understanding of those around us and those living in the books we read.