Visar resultat 1 - 5 av 25 avhandlingar innehållade ordet datering.
Sammanfattning : Vänern och dess sediment har under 1900-talet varit en av Sveriges mest kvicksilver (Hg) kontaminerade miljöer. 47 sedimentprofiler tagna 2001 analyserades for total Hg och temporala och spatiala mönster påvisades. Av den direkta Hg tillförseln 1918-2001 återfinns c:a 30 ton i bottensedimenten. LÄS MER
Sammanfattning : .... LÄS MER
Sammanfattning : Dating of metamorphic events is crucial for the understanding and reconstruction of large-scale geological processes such as orogenesis. Zircon is one of the most commonly used minerals for dating of igneous and metamorphic events. Zircon incorporates uranium and excludes lead during crystallization, and with time the uranium decays to lead. LÄS MER
Sammanfattning : Return migration is one of the least studied areas within migration research, although it has major implications for both sending and receiving societies. The importance of the phenomenon is shown by the fact that more than 50 percent of the immigrants who arrived in Sweden in 1970 had returned after twenty years. LÄS MER
Sammanfattning : This book deals with return migration from Sweden in the period 1968-1996 to Chile, Germany, Greece, Iran, Poland, Turkey, United States and Yugoslavia, against the background of economic and political developments in Sweden and in the different source countries. An important question in the study regards whether return migrants deviate from other immigrants in terms of human capital characteristics and economic integration. LÄS MER