introduction mineral composition of source rock is one of the most important factors for concentration and distribution of heavy metals in sediments. therefore, study on distribution of these elements and the related minerals in sediments provides information about natural origin of elements. moreover, the interpretation of origin and distribution of sandy sediments is considerably enhanced by ...

This short paper qualitatively introduces the definition of the concepts of Deadlock and Livelock for a general class of Hybrid Control Systems (HCS). Such a characterization hinges on three important aspects: firstly, the concept of composition of HCS; secondly, the general concept of specifications and their composition for HCS; finally, the dynamical structure and behaviors of HCS. The first...

VAN RENSBURG, L. J. & VANWYK, J. A., 1981. Studies on schistosomiasis. 10. Development of Schistosoma mattheei in sheep infested with equal numbers of male and female cercariae. Onderstepoort Journal of Veterinary Research, 48, 7786 (1981). The development of the female Schistosoma mattheei was significantly higher than that of the male (P<O,OOOI) in 12 sheep when each was exposed to equal numb...

LITTLEJOHN, A. & BOWLES, FELICITY, 198 1. Studies on the physiopathology of chronic obstructive pulmonary disease in the horse. V. Blood gas and acid-base values during exercise. Onderstepoort Journal of Veterinary Research, 48. 239-249 (I 981). The haemoglobin concentration, the partial pressures of oxygen a nd carbon dioxide, the oxygen content and the pH were determined in the arterial and m...

In January 2021 the UK left EU. Brexit was ‘done’. One year later shape of Global Britain’s agri-food trade policies is somewhat clearer. The core EU agreements are a Trade and Cooperation Agreement (TCA), Protocol on Ireland/Northern Ireland. protocol meant that Northern Ireland remained in EU’s Customs Union Single Market, UK’s Union. It has caused considerable political controversy within Im...

For some theorists, talk about politics is infrequent, difficult, divisive, and, to be efficacious, must proceed according to special rules in protected spaces. We, however, examined ordinary political conversation in common spaces, asking Americans how freely and how often they talked about 9 political and personal topics at home, work, civic organizations, and elsewhere. Respondents felt free...

In the paper, I 'rst try to give some impression of Norwegian contributions to combinatorics in the 20th century. This is followed by some remarks on my own combinatorial experiences. c © 2001 Elsevier Science B.V. All rights reserved. [It] would bring to this country something absolutely new, namely the historic and humanistic side of mathematics. The success of the Institute of the History of...

During her thirty years at the Bibliothèque Nationale (BN), Suzanne Briet (1894–1989) made important theoretical, organizational, and institutional contributions to the documentation movement in France. This article attempts to place her documentation work within the context of the far-reaching reform of French libraries, with special attention to the transformation of the BN. Like her colleagu...