Miksi antiikissa ei syntynyt (modernia) kapitalismia?

Kirjallisuusarvostelu

Picosecond pulse amplification up to a peak power of 42 W by a quantum-dot tapered optical amplifier and a mode-locked laser emitting at 1.26 μm

We experimentally study the generation and amplification of stable picosecond-short optical pulses by a master oscillator power-amplifier configuration consisting of a monolithic quantum-dot-based gain-guided tapered laser and amplifier emitting at 1.26 μm without pulse compression, external cavity, gain-or Q-switched operation. We report a peak power of 42 W and a figure-of-merit for second-order nonlinear imaging of 38.5 W2 at a repetition rate of 16 GHz and an associated pulse width of 1.37 ps.

A Morte no Futuro: A Europa na obra de Stefan Zweig

Zweig defende a luta insigne contra o fanatismo à sombra do humanismo e da tolerância, liberdade de pensamento segundo o ideal da humanidade respeitadora do espírito do conhecimento, da verdade e da acção moral levada a cabo pelo paradigrnatico Homo per se em Triumph und Tragik des Erasmus von Rotterdam

Estratégias de representação do «eu» e do sentir feminino em narrativas de Stefan Zweig, Simone de Beauvoir e Rita Ferro

Dissertação apresentada para cumprimento dos requisitos necessários à obtenção do grau de Mestre em Estudos Portugueses – Estudos Literários.

Optimal control of a Stefan problem with gradient-based methods in FEniCS

Otto-von-Guericke-Universität Magdeburg, Fakultät für Mathematik, Masterarbeit, 2016

Optimal exponent heat balance and refined integral methods applied to Stefan problems

When using a polynomial approximating function the most contentious aspect of the Heat Balance Integral Method is the choice of power of the highest order term. In this paper we employ a method recently developed for thermal problems, where the exponent is determined during the solution process, to analyse Stefan problems. This is achieved by minimising an error function. The solution requires no knowledge of an exact solution and generally produces significantly better results than all previous HBI models. The method is illustrated by first applying it to standard thermal problems. A Stefan problem with an analytical solution is then discussed and results compared to the approximate solution. An ablation problem is also analysed and results compared against a numerical solution. In both examples the agreement is excellent. A Stefan problem where the boundary temperature increases exponentially is analysed. This highlights the difficulties that can be encountered with a time dependent boundary condition. Finally, melting with a time-dependent flux is briefly analysed without applying analytical or numerical results to assess the accuracy.

Application of standard and refined heat balance integral methods to one-dimensional Stefan problems

The work in this paper concerns the study of conventional and refined heat balance integral methods for a number of phase change problems. These include standard test problems, both with one and two phase changes, which have exact solutions to enable us to test the accuracy of the approximate solutions. We also consider situations where no analytical solution is available and compare these to numerical solutions. It is popular to use a quadratic profile as an approximation of the temperature, but we show that a cubic profile, seldom considered in the literature, is far more accurate in most circumstances. In addition, the refined integral method can give greater improvement still and we develop a variation on this method which turns out to be optimal in some cases. We assess which integral method is better for various problems, showing that it is largely dependent on the specified boundary conditions.

Application of the combined integral method to Stefan problems

In this paper we present a new, accurate form of the heat balance integral method, termed the Combined Integral Method (or CIM). The application of this method to Stefan problems is discussed. For simple test cases the results are compared with exact and asymptotic limits. In particular, it is shown that the CIM is more accurate than the second order, large Stefan number, perturbation solution for a wide range of Stefan numbers. In the initial examples it is shown that the CIM reduces the standard problem, consisting of a PDE defined over a domain specified by an ODE, to the solution of one or two algebraic equations. The latter examples, where the boundary temperature varies with time, reduce to a set of three first order ODEs.

Hej ! Janosik, Janosik ! : mountaineer song ; Pobili się dwaj górale : mountaineer song / Stefan Jarosz, chant ; orkiestra Fr. Przybylskiego

[Traditions. Europe. Pologne. Tatras]

Reflexions al voltant de la resiliencia. Una conversa amb Stefan Vanistendael

E Darre rament, e l concepte resili cncia s' ha fet molt present en e ls discursos tècnics del camp soc ial. Ara bé, e ls usos que se li estan donant són múlti ples i en alguns casos molt diferenciats entre ells. Per cl arificar e l sentit ini c ial de l concepte hem mantingut una: conversa amb el professor Stefan VanistendaeL una de les persones que més ha desenvolupat aquest concepte i explorat les seves aplicacions.