We evaluate the radiation and gravitational forces on dust grains out of the disk for a large sample of spiral galaxies. The main results are a selective expulsion of grains and the presence of equilibrium positions inside the halo, providing a new test for the distribution of dark matter.
Critical analysis of the results of space experiments, taking into account the contributlon of large particles to the total mass production of comet Halley leads to much higher values of the dust production rate than those derived from the first analysis of space measurements. As a consequence it seems necessary to correct the gas to dust ratio of the mass production by a factor of 10, from 0,1-1,0 to 1.0-10. The corrected values of dust production rate are in much better agreement both with the current concepts of the comeťs history and wlth the evolution of Its meteor stream.
Předmětem výzkumu je pár náramků z Nového Knína, okr. Příbram, z nichž první se objevil v roce 1965, druhý v roce 2014. První náramek byl v minulosti charakterizován jako stříbrný, s analogiemi v skandinávském kruhovém šperku 10.–11. století. V roce 2008 byl podroben prvkové analýze RFA. Ukázalo se, že je složen ze slitiny mosazi s příměsí stříbra. Po překvapivém objevu druhého náramku byla realizována série přírodovědných a archeologicko-kulturně antropologických analýz, které v souhrnu přinesly chronologické a materiálové přehodnocení dosud publikovaných údajů, včetně jejich „nálezových“ okolností. Z výsledků analýz plyne, že oba šperky jsou téměř identické. Analýzy dále přinesly zjištění, že je nelze považovat za raně středověké, nýbrž za novověké až recentní výrobky patrně mimoevropského původu (Afrika?), nejspíš turistické suvenýry. and The subject of the investigation is a pair of bracelets from Nový Knín in the Příbram district, the first of which appeared in 1965, the second in 2014. In the past, the first bracelet was characterised as silver, with analogies in Scandinavian ring ornaments of the 10th–11th century AD. But when this bracelet was subjected to an elemental analysis XRF in 2008, it was found to be composed of an alloy of brass with an admixture of silver. Following the surprising discovery of the second bracelet, a series of scientific and archaeological-culturally anthropological analyses were conducted, the results of which led to a chronological and material re-evaluation of previously published data, including their ‘find’ contexts. The analyses indicate that the two ornaments are virtually identical and also reveal that they cannot be regarded as early medieval artefacts but rather as Modern to recent products that were likely made outside of Europe (Africa?), probably of a tourist souvenir
Pražský Archeologický ústav AV ČR uskutečnil v listopadu a prosinci 2014 záchranný archeologický výzkum v areálu developerského projektu Letňanské zahrady. Vedle osmi hrobů kultury se šňůrovou keramikou z pozdní doby kamenné (2800-2500 př. n. l.) byly objeveny dva komorové hroby kultury bylanské ze starší doby železné (halštatské) z 8.-6. stol. př. n. l. and Drahomíra Frolíková.
Development-led excavation in Rousínov in 2017 uncovered a La Tène cemetery in which 30 graves were excavated. Out of these, two exceptional graves, a rich female inhumation and a warrior’s cremation grave, are discussed in detail in this paper. In addition to typological determination of artefacts, the paper includes the results of a survey and conservation work on metal artefacts and anthropological analysis. The inhumation burial of a gracile woman at the age of about 30 years (H823) contained, among other things, a complete bimetallic chain-belt; its furnishing can be dated to LT B2/C1. The warrior’s cremation contained, among other things, an undeformed sword in its scabbard and a spear-head with an exceptionally decorated socket; the grave goods date to LT C1.
This study presents for the first time in detail two manuscripts dealing with the beginnings of the Unitas Fratrum which are in the holdings of the Benedictine Library in Seitenstetten in Austria. Manuscript 72, dating from the beginning of the nineties of the 15th century, contains Latin translations of five letters written by the Czech Brethren to Jan Rokycana from 1489, which have been unknown till now and excerpts from five introductory chapters of the Síť víry (The Net of Faith) by Petr Chelčický, also translated into Latin in 1477. Manuscript 302 contains a copy of the record of an interrogation of four prominent Brethren in Kłodzko in 1480. This article indicates the possibilities of studying these texts, focusing on three main points: on their possible contribution to text tradition research, on research of the circumstances of the origin of their translations, and on the person of the scribe who made the collection. From the possible persons the inquisitor Jindřich Institoris has been excluded as his autograph doesn´t correspond with the writing of the scribe being looked for.
The authors present their respective views on the development of the Czech post-war syntactic studies. Their approach is influenced by the fact that they were educated by the different syntactic schools: thus the paper is a combination of Prague’s and Brno´s views. V. Šmilauer´s Novočeská skladba (Syntax of Modern Czech, 1947) is understood as a source of the contemporary research of the Czech syntax. The paper describes the results reached by individual investigators as well as the results of the research teams. According to the authors´ opinion, Two-Level Valency Syntax (represented by F. Daneš and his close collaborators and reflected in the Czech Academic Grammar) and Functional Generative Grammar (developed by P. Sgall and his colleagues) form the main paradigms of the Czech syntax since 1960. Both theories incorporate the results of the classical Praguian functional approach as well as results of the generative paradigm. The authors conclude that the Prague‘s and Brno´s views on the development of Czech syntactic studies are not incompatible but rather complementary and that the methods of formal and corpus linguistics are attractive and useful for the young researchers.