Micromagnetic hysteresis simulations enable a rigorous and structured investigation of these relations since in the numerical model each material parameter can be altered independently. This paper describes a procedure to extract the Preisach distribution function, quantifying the macroscopic hysteresis properties, from micromagnetic simulations incorporating the materials’ microstructure. Furthermore, the instantaneously added, stored and dissipated energy while running through find more the hysteresis loop
as described in the macroscopic Preisach model and in the micromagnetic hysteresis model are compared, evidencing a very good agreement. Moreover, using the micromagnetic model, the energy
rearrangements between the different micromagnetic interaction terms is studied at each time point of the hysteresis loop. It is concluded that the micromagnetic hysteresis model is a valuable tool in the study of hysteresis properties and loss mechanisms in ferromagnetic materials. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3505779]“
“The melt apparent shear viscosity (eta(a)) of polypropylene (PP) composites filled with aluminum hydroxide [Al(OH)(3)] and magnesium hydroxide [Mg(OH)(2)] was measured by means of a capillary rheometer under experimental conditions Natural Product Library molecular weight of temperature ranging from 180 to 200 degrees C and apparent shear rate varying from 10 to 2 x 10(3) s(-1), to identify the effects of the filler particle content and size on the melt viscosity. The results showed that the melt shear flow of the composites obeyed the power law and presented pseudoplastic behavior. The dependence of eta(a) on temperature was consistent with the Arrhenius equation. The sensitivity selleck products of eta(a) for the composite melts to temperature was greater than that of
the unfilled PP, and weakened with increasing apparent shear rate. The eta(a) increased linearly with an increase of the weigh fraction of the flame retardant, especially in the low apparent shear rate region. The eta(a) of the composites decreased slightly with an increase of particle size of flame retardant. Moreover, the variation for the eta(a) with particle size of flame retardant was much less than with apparent shear rate under these test conditions. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 119: 1835-1841, 2011″
“Objectives. Human herpesviruses, e. g., herpes simplex virus (HSV) type 1, Epstein-Barr virus, and cytomegalovirus, appear in saliva at greater frequency in persons infected with human immunodeficiency virus (HIV) than in healthy individuals. However, it is not known if varicella zoster virus (VZV) and HSV-2 appear simultaneously during HIV infection at greater frequency in saliva in this era of highly active antiretroviral therapy ( HAART).