The paper deals with the mathematical modelling and the computer simulation of forced vibrations of the reactor core barrel excited by pressure pulsations generated by main circulation pumps. The modelling is focused on a possible core barrel flange slip along a pressure vessel flange. The slip in this internal reactor linkage is analysed providing the solid friction and the backlash between slip tongues of the pressure vessel flange and grooves in the core barrel flange. The impact motion can produce an excessive abrasive wear of the tongues and grooves. A guarantee of the fail-safe operation is achieved by calculated pre- stressing of toroidal tubes inserted between the upper flange of the core barrel and the pressure vessel cover. and Obsahuje seznam literatury
Cultural historian and ethnographer Čeněk Zíbrt, scientist, university professor and editor of popular periodicals, entered the awareness of his contemporaries as a prominent, erudite specialist. As such he had been accepted not only in Bohemia, but also in Moravia. To his fame contributed also his role of an editor of the ethnographic journal „Český lid“ [Czech Folk], published since the year 1892. Precisely for the Moravian ethnographes the contacts with this journal and with Zíbrt himself were of multilateral importance. They were sending him their publications, books and various treatises to be reviewed or propagated in Český lid. Themselves they also contributed to the journal with their articles, texts of varied quality and different genres, extensive studies, shorter articles and various bagatelles. An important contribution represented also the illustrations, sent from Moravia by artistically competent ethnographers and photographers. Český lid, on the other hand, offered a welcome source of income to many authors. However, Zíbrt selected carefully from the contributions sent by the ethnographers, so many of them waited long for the publication of their article. Many of the contributors asked their texts and illustrations to be returned to them, sometimes not successfully. Such inauspicious experiences with publicating in Český lid resulted in limitation of contacts of some ethnographers with Zíbrt. In špite of this, the majority of them appreciated the periodical very much. This fact was documented also by their not pretended joy from the renewal of Český lid in the 1920 ’s. Zíbrt, editor of the renewed journal, was contacted by new or renewed contributors.