Sökning: "break-up event"
Visar resultat 1 - 5 av 9 avhandlingar innehållade orden break-up event.
1. The flux of extraterrestrial matter to Earth as recorded in Paleogene and Middle Ordovician marine sediments
Sammanfattning : This thesis aims at reconstructing events in the solar system, mainly collisional events in the asteroid belt, by searches for extraterrestrial minerals in Paleogene and Middle Ordovician marine sediments on Earth. Recent empirical evidence show that Earth has experienced a few brief periods during the Phanerozoic when the flux of extraterrestrial matter significantly increased. LÄS MER
2. Traces in Earth's geological record of the break-up of the L-chondrite parent body 470 Ma
Sammanfattning : This thesis deals with signatures in sediments on Earth related to the L-chondrite parent body break-up event at 470 Ma. The aim of this thesis is twofold: (1) investigate if the increased flux of extraterrestrial material to Earth, following the disruption of the L-chondrite parent body included larger, asteroid-sized bodies (2) try to develop new methods and tools for finding and classifying relict cosmic material in sediments. LÄS MER
3. Fibre flocculation during twin-wire roll forming
Sammanfattning : At the division of Paper Technology a forming unitconsisting of headbox, forming roll unit and reservoir systemfor suspension recirculation has been constructed, with themain purpose to experimentally study the paper forming event byvisually following the fibre flow phenomena in the formingzone.The effect of various running parameters upon the pressuredistribution, which is in correlation to the flow phenomenaoccuring during forming, has been studied with a flush mountedpressure sensor. LÄS MER
4. Beyond a Second Demographic Transition? Fertility and family dynamics in Iceland
Sammanfattning : This thesis serves to bring Iceland into the realm of Nordic family-demographic and fertility research. Based on event-history techniques applied to Iceland longitudinal register data, I provide an overview of contemporary family-demographic trends during the last few decades. The thesis consists of four empirical studies. LÄS MER
5. Finska krigsbarn
Sammanfattning : The worlds largest exodus of children is considered the transfer of circa 70,000 children from Finland to Sweden from 1939 to 1945. The experience of the Finnish war children contains a distinctive wealth of knowledge which should not be lost. LÄS MER