In the paper, we investigate queueing system M/G/∞ with non–homogeneous customers. As non–homogenity, we mean that each customer is characterized by some arbitrarily distributed random volume. The arriving customers appear according to a stationary Poisson process. Service time of a customer is proportional to his volume. The system is unreliable what means that all its servers can break simultaneously and then the repair period goes on for random time having an arbitrary distribution. During this period, customers present in the system and arriving to it are not served. Their service continues immediately after repair period termination. Time intervals of the system in good repair mode have an exponential distribution. For such system, we determine steady–state sojourn time and total volume of customers present in it distributions. We also estimate the loss probability for the similar system with limited total volume. An analysis of some special cases and some numerical examples are attached as well.

Studies were carried out in the region of southern. Drake Passage and Bransfield Strait in February and March 1981. The relation occurring between the alimentary tract filling (ATF) and the quantity of chlorophyll α integrated within the range of 0-150 m water-layer may be described by Ivlev's equation expressing the amount of the food ration in relation to food concentration. The ATF value increases in large individuals and is proportional to their body weight. The daily rythm of krill feeding, expressed by ATF, depends on the quantities of food in the environment.

A deeply patinated artifact, interpreted as a side-scraper, has been revealed during an evaluation of lithic chipped materials from the Eneolithic hillfort Starý Zámek near Jevišovice (Znojmo district). The artifact is made of raw material from Cracow-Częstochowa Jurassic area and its provenience should be sought within the Middle Paleolithic milieu in Poland rather than in Moravia. As the artifact is looking strange within the local Middle Paleolithic, it was very probable imported later. Presence of the Jurassic silicites from the Cracow-Częstochowa Upland within the Funnel Beaker context, i.e. in the layer C2 of the hillfort Starý Zámek, document a possible contact during the Eneolithic.