990 resultados para Denina, Carlo, 1731-1813.


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Michael Fraenkel

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composto in Ebraico e tradotto da Leilo Cantoni. Messo in musica dal Luigi De-Macchi il 13 settembre 1849

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mittgeteilt von Moritz Stern

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This bipartite comparative study aims at inspecting the similarities and differences between the Jones and Stokes–Mueller formalisms when modeling polarized light propagation with numerical simulations of the Monte Carlo type. In this first part, we review the theoretical concepts that concern light propagation and detection with both pure and partially/totally unpolarized states. The latter case involving fluctuations, or “depolarizing effects,” is of special interest here: Jones and Stokes–Mueller are equally apt to model such effects and are expected to yield identical results. In a second, ensuing paper, empirical evidence is provided by means of numerical experiments, using both formalisms.

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In this second part of our comparative study inspecting the (dis)similarities between “Stokes” and “Jones,” we present simulation results yielded by two independent Monte Carlo programs: (i) one developed in Bern with the Jones formalism and (ii) the other implemented in Ulm with the Stokes notation. The simulated polarimetric experiments involve suspensions of polystyrene spheres with varying size. Reflection and refraction at the sample/air interfaces are also considered. Both programs yield identical results when propagating pure polarization states, yet, with unpolarized illumination, second order statistical differences appear, thereby highlighting the pre-averaged nature of the Stokes parameters. This study serves as a validation for both programs and clarifies the misleading belief according to which “Jones cannot treat depolarizing effects.”

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von Johann Franz v. Herrmann

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The numerical simulations of the magnetic properties of extended three-dimensional networks containing M(II) ions with an S = 5/2 ground-state spin have been carried out within the framework of the isotropic Heisenberg model. Analytical expressions fitting the numerical simulations for the primitive cubic, diamond, together with (10−3) cubic networks have all been derived. With these empirical formulas in hands, we can now extract the interaction between the magnetic ions from the experimental data for these networks. In the case of the primitive cubic network, these expressions are directly compared with those from the high-temperature expansions of the partition function. A fit of the experimental data for three complexes, namely [(N(CH3)4][Mn(N3)] 1, [Mn(CN4)]n 2, and [FeII(bipy)3][MnII2(ox)3] 3, has been carried out. The best fits were those obtained using the following parameters, J = −3.5 cm-1, g = 2.01 (1); J = −8.3 cm-1, g = 1.95 (2); and J = −2.0 cm-1, g = 1.95 (3).

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Welsch (Projektbearbeiter): Abdruck von insgesamt 16 Liedtexten aus den Befreiungskriegen anläßlich des 35. Jahrestages des von König Friedrich Wilhelm III. in Breslau erlassenen Aufrufs zur Bildung freiwilliger Jägerkorps zum Kampf gegen Napoléon (3. Februar 1813)

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Welsch (Projektbearbeiter): Karikatur auf die politische Lage Deutschlands: Darstellung des deutschen Michels als Gärtnerburschen, der den Baum der deutschen Freiheit hegt, auf dessen Zweigen die 'Reichsvögel' (die verschiedenen politischen Richtungen) ihre Lieder singen