The present-day mass function (PDMF) of field stars in the solar neighborhood is discussed. Major uncertainties in the derivation exist, in partlcular the luminosity-mass relation and the bolometric corrections. Consequently, It is not clear whether the PDMF turns over at very low masses (M < 0.3 Mq), and the slope at the
high-mass end (M > 10 Mq) is more uncertain than usually assumed. The reality of two features in the PDMF (at M = 1.2 Mq and M = 3 Mq respectively) is an open question. Next, the concept of a bimodal IMF is critically examined. Both Gůsten and Mezger's (1983) and Larson's (1986) bimodal models may run into problems. If the effects of high-mass stars prevent low-mass stars from forming, the term "biassed IMF" is a better
description of the situation than "bimodal IMF". The IMF is probably not universal; reported IMF variations in open clusters and globular clusters are unlikely to be spurious. Finally the physics of the IMF is discussed. The. fact that the mass of a star in the making depends on many random-valued (multlplicative) input parameters
suggests a stochastic rather than a deterministic approach for the origin of the IMF.
We give a definition of uniform PU-integrability for a sequence of /i-measurable real functions defined on an abstract metric space and prove that it is not equivalent to the uniform p-integrability.
Chartrand et al. (2004) have given an upper bound for the nearly antipodal chromatic number ac′ (Pn) as (n−2 2 ) + 2 for n ≥ 9 and have found the exact value of ac′ (Pn) for n = 5, 6, 7, 8. Here we determine the exact values of ac′ (Pn) for n ≥ 8. They are 2p 2 − 6p + 8 for n = 2p and 2p 2 − 4p + 6 for n = 2p + 1. The exact value of the radio antipodal number ac(Pn) for the path Pn of order n has been determined by Khennoufa and Togni in 2005 as 2p 2 − 2p + 3 for n = 2p + 1 and 2p 2 − 4p + 5 for n = 2p. Although the value of ac(Pn) determined there is correct, we found a mistake in the proof of the lower bound when n = 2p (Theorem 6). However, we give an easy observation which proves this lower bound.
The paper deals with the modelling of a real gearbox used in cement mill applications and with the sensitivity analysis of its eigenfrequencies with respect to design parameters. The torsional model (including a motor and couplings) based on th finite element method implemented in an in-house MATLAB application is described. The sensitivity analysis of gearbox eigenfrequencies is performed in order to avoid possible dangerous resonance states of the gearbox. The parameters chosen with respect to the sensitivity analysis are used for tuning the gearbox eigenfrequencies outside resonance areas. Two approaches (analytical and numerical) to the sensitivity calculation are discussed. and Obsahuje seznam literatury
The authors analyse the discourse of Green Ways (GW), a company using multi-level marketing where women comprise the majority of distributors. The article shows that however multi-level marketing is advertised as a highly flexible form of employment suitable for those who want to combine family life with work, it is rather a way of marketing than an employment opportunity. A significant role in this business is played by women on parental leave who earn self-esteem based in the neoliberal values of self-reliance and entrepreneurial success, rather than FINANCIAL income. The analysis links their ways of describing the character and benefits of selling GW products with the ideology presented in GW manuals for distributors. Using Bourdieu’s theory, the authors point out how GW constructs the symbolic oppositional binary in line with the neoliberal notion of an efficient individual., Irena Lištiaková, Lucie Jarkovská., and Obsahuje seznam literatury