КРУТИЛЬНЫЙ МЕТОД ИЗМ ЕРЕНИЯ КРИВЫХ НАМАГН ИЧЕНИЯ ТОНКИХ ФЕРРОМАГНИТНЫХ СЛОЕ В

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Torsion method measurements of the magnetization curves of thin ferromagnetic films

     

Основные соотношени я длн построения механических селект оров нейтронов

, . , , . . , , .     

ИЗУЧЕНИЕ ЭЛЕКТРОПРО ВОДНОСТИ МАРГАНЕЦ-ЦИ НКОВОГО ФЕРРИТА

Изучается электропр оводность марганец-ц инкового φеррита в за-висимости от температуры и внеш него электрического поля. Первая часть работы з аключает результаты измерений темпе-рату рной зависимости проводи мости φеррита в широк ом темпера-турном интервале, во второй ч асти иаучается относ ительное изме-нение сопротивления с темп ературой при различн ых значениях элек-три ческого напряжения измеряем ого образца. Третья часть посвяща ется изучению взаимн ого отношения между константой А и знерги ей активации ε, участв ующих в экспоненциал ь-ном выражении для провод имости,

$$\sigma (T) = Ae^{ - \frac{\varepsilon }{{2kT}}} $$     

Zur Temperaturabhängigkeit der Rechteckigkeits-Koeffizienten der Mangan-Magnesium-Ferrite

Ohne Zusammenfassung

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Abschließend danken wir der Kollegin A. Hadincová für die mit Sorgfalt durchgeführten Messungen.     

How to measure squeezing and entanglement of Gaussian states without homodyning

We propose a scheme for measuring the squeezing, purity, and entanglement of Gaussian states of light that does not require homodyne detection. The suggested setup needs only beam splitters and single-photon detectors. Two-mode entanglement can be detected from coincidences between photodetectors placed on the two beams.     

Numerical modelling of turbulent flow over rough walls

The numerical simulation of turbulent flow over rough walls was carried out for various types of roughness. The mathematical model was based on the Reynolds averaged Navier-Stokes equations for incompressible flow. The two-equation SST and oneequation Spalart-Allmaras turbulence models were used. Boundary conditions on rough walls were prescribed directly on the wall using the SST model modified to account for wall roughness by Hellsten and Laine (1997) and the SA model modified by Aupoix and Spalart (2003). Turbulence models were tested for the constant pressure turbulent boundary layer on the rough wall formed by commercial abrasive paper and by tightly packed spheres. The effect of wall roughness on the decelerated flow over a smoothly contoured ramp with flow separation was investigated. Obtained results were compared with experimental data. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)     

Oxo Peroxo Glycolato Complexesof Vanadium (V). Crystal Structureof (NBu4)2[V2O2(O2)2(C2H2O3)2]?H2O

 Oxo peroxo glycolato complexes of vanadium(V) (M ₂[V₂O₂(O₂)₂(C₂H₂O₃)₂]ċnH₂O (n=0, 1; M=NBu₄ ⁺ (1), K⁺ (2), NH₄ ⁺ (3), Cs⁺ (4), NPr₄ ⁺ (5)) as well as (NBu₄)₂[V₂O₄(C₂H₂O₃)₂]ċ H₂O (6) have been prepared and characterized by spectroscopic methods. X-Ray structure analysis of 1 revealed the presence of dinuclear [V₂O₂(O₂)₂(C₂H₂O₃)₂]²⁻ anions with a (chemical structure) bridging core and six coordinated vanadium(V) atoms in a distorted pentagonal pyramidal array.