The dominant forces determining the motion of interplanetary particulates are gravitation, solar radiation pressure and Lorentz force. The latter two becoming significant for micron- and submicron- sized particles. In situ measurements by spaceprobes, microcrater distributions and remote observations both in the IR and visible wavelength range have established the mass frequency and spatial distribution of dust particles in interplanetary space. Consequences of the Poynting-Robertson effect and mutual collisions on these distributions and the contributions of various sources (interstellar dust, asteroids and comets) are discussed. It is shown that the contribution from a distributed source of large particles in the inner solar system is most important. Collisions between these meteor sized particles (m > 10^-5 g) produce large amounts of zodiacal light particles (10^-5 g to 10^-10 g) and
β-meteoroids (m < 10^-10 g) which leave the solar system on hyperbolic orbits. At the present time the Poynting-Robertson effect transports into the inner solar system less than 10% of the zodiacal light particles which are produced by collisions from bigger particles.
High resolution {OV5) two-dimensional spectra performed with the Multichannel Soustractive Double Pass (MSDP) spectrograph of the Pie du Midi Observatory, were analysed. An adapted image processing provides two-dimensional intensity and velocity maps of the solar granulation at two intensity levels of the photospheric line NaD2, filtered for the 5 min oscillations. An inspection of such
maps confirms that the bright granules at the continuum level are well correlated witli rising material as well as the dark intergranular spaces with falling material, and that the velocity fluctuations
penetrate much high into the photosphere than the intensity fluctuations. The one-dimensional power spectrum has a slope close to - 5/3, characteristic of a turbulent medium, in the size range
of the granulation. It is suggested that the convectivc energy is supplied by the mesogranulation and the supergranulation; this energy is then cascading toward the smaller scales through the granulation, which thus appears to be turbulent.
The article covers the topic of women's migration from poorer countries to the so called First World to provide domestic work and care giving. On the one hand, their movement is caused by the demand for domestic labour in rich countries where double career couples resolve the dilemma of reconciliation of public and private spheres by externalization of domestic work. On the other hand, the supply is significant. Migration and provision of domestic service is often the only survival strategy available to women from developing countries due to high unemployment and few working opportunities. The practice of hiring a migrant as domestic worker creates global care chains (Hochschild, 2001) that connect women engaged in care giving - those who are postponing it and those who are providing it. Migrant women hold an unequal position in these chains. They comprise a cheap labour in the informal private sector and so are vulnerable to abusive treatment. To tackle such discrimination, the patriarchal system stereotyping both women's and men's roles has to be challenged on the both sides of the care chain: in the developed as well developing countries.
Syria changed from a seemingly stable and slowly modernising country to the site of a regional conflict in a matter of months. The factors of escalation are to be sought in three interrelated aspects: in the power structures of the Asad regime, that choose to deal with the reverberations of the Arab Spring through intensified security alone; in the transformation of social protest into a sectarian conflict; in the unconditional support that all sides receive from abroad. As a result, Syria ceased to be what it was three years ago: a country, a state, and a society., Zora Hesová., and Obsahuje bibliografii
[Zprávy Československé společnosti pro dějiny věd a techniky při ČSAV 9-10, 29-66 (1968)] and I. Bernard Cohen ; úvod redakce společný i pro předchozí článek je uveden na straně 220.
The DØ Experiment consists of a worldwide collaboration of scientists conducting research of the fundamental nature of matter. The experiment is located at the world´s premier high-energy accelerator, the Tevatron Collider, at the Fermi National Accelerator Laboratory (Fermilab) in Batavia, Illinois, USA. The research is focused on precise studies of interactions of protons and antiprotons at the highest available energies. It involves and intense search for subatomic clues that reveal the character of the building blocks of the universe. and Alexander Kupčo, Miloš Lokajíček.