We consider the theory of very weak solutions of the stationary Stokes system with nonhomogeneous boundary data and divergence in domains of half space type, such as $\mathbb R^n_+$, bent half spaces whose boundary can be written as the graph of a Lipschitz function, perturbed half spaces as local but possibly large perturbations of $\mathbb R^n_+$, and in aperture domains. The proofs are based on duality arguments and corresponding results for strong solutions in these domains, which have to be constructed in homogeneous Sobolev spaces. In addition to very weak solutions we also construct corresponding pressure functions in negative homogeneous Sobolev spaces.
The wedding, or its socio-cultural equivalent, was considered to be the most important social event in all human societies of all time. In traditional European society, everything that related to the creation of a permanent union between a man and a woman in the institution of marriage was endowed with a sacred character and was subject to public scrutiny. The study aims to provide a commented description and to interpret the wedding merriment recorded in the first half of 1990 in Šumice, one of the Czech villages in the Romanian Banat. The first part explains the issue of the ethnic enclave as a subject of ethnological study. It defines the peculiarities of Šumice in the context of the Czech Banat, and it gives an overview of the demographic development of the village. The wedding ritual (veselka) in Šumice is presented from an ethnographic-historical perspective first. The first part of the study was published in the previous, first, issue of Ethnographic Journal 2022.
The wedding, or its socio-cultural equivalent, was considered to be the most important social event in all human societies of all time. In traditional European society, everything that related to the creation of a permanent union between a man and a woman in the institution of marriage was endowed with a sacred character and was subject to public scrutiny. The study aims to provide a commented description and to interpret the wedding merriment recorded in the first half of 1990 in Šumice, one of the Czech villages in the Romanian Banat. The first part explains the issue of the ethnic enclave as a subject of ethnological study. It defines the peculiarities of Šumice in the context of the Czech Banat, and it gives an overview of the demographic development of the village. The wedding ritual (veselka) in Šumice is presented from an ethnographic-historical perspective first. The second part of the study will be published in the next, second, issue of the Ethnographic Journal 2022.
Černé díry jsou fascinující objekty. Nemusíme ale do nich rovnou padat, abychom se o nich něco dozvěděli... Proč se je podařilo objevit
až s rozvojem rentgenové astronomie? Jak funguje kosmická laboratoř?
Ve dvacátém století se astronomové dostali téměř až na samou hranici viditelného vesmíru. Ve velkých vzdálenostech na škálách stamilionů a miliard světelných roků dnes pozorujeme struktury, které vyplňují dosud nezmapovaný prostor a zároveň se pohybují a mění v čase. Pohyby a struktury velkých měřítek jsou tím nejrozsáhlejším kartografickým a astrofyzikálním projektem, ke kterému dosud astronomové dospěli., Ivan Havlíček., and Obsahuje bibliografii