1,567 research outputs found
Evidence of late Neoproterozoic glaciation in the Caledonides of NW Scandinavia
No full textF. Stodt, A.H.N. Rice, L. Björklund, G. Bax, G.P. Halverson and T.C. Pharao
Evidence of late Neoproterozoic glaciation in the Caledonides of NW Scandinavia
No full textAbstract The northwestern part of the Scandinavian Caledonides, formed by SE- to ESE-directed thrusting through the Neoproterozoic W. Baltica continental shelf, contains numerous small and often isolated outcrops of diamictite and associated strata. No precise biostratigraphic or isotopic data are available to constrain the age of these sediments, but, on the basis of their stratigraphic position, most are correlated with the Mortensnes Formation (Fm.) in E. Finnmark and also presumed to be of glaciogenic origin. The Mortensnes Fm. has been correlated with the 580 Ma Gaskiers glacial event on the basis of δ13C isotope studies. Structurally, the deposits occur in the Autochthon (below the Torneträsk Fm.), within an external imbricate zone (Lower Allochthon), within cover successions lying unconformably on allochthonous basement (Window Allochthon) palaeogeographically derived from below or outboard of the Lower Allochthon and, more rarely, within the Middle Allochthon, derived from outboard of the Window Allochthon. Evidence for a glaciogenic origin is typically poor or lacking. Only in the Komagfjord Antiformal Stack (Window Allochthon), where an up to 40-m-thick succession of three fining upwards cycles has been mapped, are the deposits comparable in thickness and complexity to the Mortensnes Fm. Other sequences are sometimes <1 m thick and unconformably overlain by post-‘glacial’ deposits. The Vakkejokk Breccia, a submarine slump in the Torneträsk area of the Autochthon closely underlies the correlative Precambrian–Cambrian lithostratigraphic boundary in E. Finnmark but overlies the first appearance of the boundary marker fossil Treptichnus pedum. Although sometimes interpreted as periglacial, this seems unlikely in view of the 30–50° palaeolatitude during deposition. Calcite nodules (<1 cm size) in the Vakkejokk Breccia have previously been interpreted as glendonite, but the microstructure and palaeolatitude makes this unlikely; they are likely a replacement of gypsum. Diamictites of uncertain origin have also been found in the Ediacaran Lower Siltstone Member of the Torneträsk Fm. and unconformably under the ?Lower Cambrian Lomvatn Fm. in the Komagfjord Antiformal Stack
Electron transport through single donors in silicon
No full text-Kavli Institute of Nanoscience DelftApplied Science
Evidence of late Proterozoic glaciation in the Caledonides of NW Scandinavia
No full textAbstract The northwestern part of the Scandinavian Caledonides, formed by SE- to ESE-directed thrusting through the Neoproterozoic W. Baltica continental shelf, contains numerous small and often isolated outcrops of diamictite and associated strata. No precise biostratigraphic or isotopic data are available to constrain the age of these sediments, but, on the basis of their stratigraphic position, most are correlated with the Mortensnes Formation (Fm.) in E. Finnmark and also presumed to be of glaciogenic origin. The Mortensnes Fm. has been correlated with the 580 Ma Gaskiers glacial event on the basis of δ13C isotope studies. Structurally, the deposits occur in the Autochthon (below the Torneträsk Fm.), within an external imbricate zone (Lower Allochthon), within cover successions lying unconformably on allochthonous basement (Window Allochthon) palaeogeographically derived from below or outboard of the Lower Allochthon and, more rarely, within the Middle Allochthon, derived from outboard of the Window Allochthon. Evidence for a glaciogenic origin is typically poor or lacking. Only in the Komagfjord Antiformal Stack (Window Allochthon), where an up to 40-m-thick succession of three fining upwards cycles has been mapped, are the deposits comparable in thickness and complexity to the Mortensnes Fm. Other sequences are sometimes <1 m thick and unconformably overlain by post-‘glacial’ deposits. The Vakkejokk Breccia, a submarine slump in the Torneträsk area of the Autochthon closely underlies the correlative Precambrian–Cambrian lithostratigraphic boundary in E. Finnmark but overlies the first appearance of the boundary marker fossil Treptichnus pedum. Although sometimes interpreted as periglacial, this seems unlikely in view of the 30–50° palaeolatitude during deposition. Calcite nodules (<1 cm size) in the Vakkejokk Breccia have previously been interpreted as glendonite, but the microstructure and palaeolatitude makes this unlikely; they are likely a replacement of gypsum. Diamictites of uncertain origin have also been found in the Ediacaran Lower Siltstone Member of the Torneträsk Fm. and unconformably under the ?Lower Cambrian Lomvatn Fm. in the Komagfjord Antiformal Stack
Otvi Group of the Western Northern Platform, the Eastern Kaoko Zone and the Western Northern Margin Zone
No full textPaul Hoffman & G.P. Halverso
New (Probabilistic) Derivation of Diaz-Metcalf and Pólya-Szegő Inequalities and Consequences
No full textClassical inequalities of Diaz - Metcalf and Pólya - Szegő are generalized to
probabilistic setting which covers the initial deterministic (both discrete and integral) variants.
From these two inequalities, by the probabilistic derivation method further well -
known inequalities are obtained (that ones by Kantorovich, Rennie and Schweitzer)
The electrons are waves: impossible interview to C.J. Davisson (1881-1958) and G.P. Thomson (1892-1975)
No full textThe author imagines to interview the Nobel Laureates in Physics of the year 1937, who turned upside-down modern physics, demonstrating the wave nature of matter. The answers of C. Davisson and G.P. Thomson are based on
the Nobel Lectures they delivered during the Nobel Prize Award Ceremony
Evaluatierapport “Powered by you”: Ontwikkeling Sustainable Energy Floor- energieopwekkende vloer
No full textOp weg naar rendabele energieopwekking door lopen. Er was een voorsprong in kennis en ervaring aangaande de techniek die nodig was een energie genererende loopvloer (de Sustainable Energy Floor – SEF) te realiseren. Specifieke aanpassingen moesten echter ontwikkeld worden in verband met de andere bewegingsvorm, de schaal die vele malen groter is en de andere installatie- en logistieke eisen. Het doel was om een pilot te doen op één of meer aansprekende locaties. Het project moest een belangrijke stap zijn op weg naar rendabele energieopwekking door lopen. Samen met de TU Delft, faculteit Industrieel Ontwerpen en Rinnic Vaude is onderzoek gedaan naar de haalbaarheid van het ontwikkelen van SEF, zijn prototypes en een pilotvloer gerealiseerd, tests gedaan en presentaties en demonstraties gegeven aan vele partijen en een breed publiek in Delft en Rotterdam. Vanwege technische knelpunten gedurende het project en de praktische haalbaarheid is er niet één grote pilot voor een langere periode gedaan, maar zijn er meerdere kortdurende pilots en tests gedaan. Het voordeel hiervan was dat we op basis van de analyses, tests en de feedback van gebruikers op verschillende versies prototypes, het ontwerp steeds verder konden verbeteren. Tenslotte heeft dit geresulteerd in het bouwen van de pilotvloer, waarmee de eindtest in De Kuip is uitgevoerd naar tevredenheid van alle betrokken partijen. Het project is succesvol afgerond en de doelstellingen zijn gehaald binnen het gestelde budget. Het project is uitgevoerd met steun van het programma Kansen voor West, wat valt onder het Europese Fonds voor Regionale Ontwikkeling.Industrial Design Engineerin
Decay of turbulence at high Reynolds numbers
No full textUsing the unique capabilities of the Variable Density Turbulence Tunnel at the Max Planck Institute for Dynamics and Self-Organization, we investigated virtually homogeneous and isotropic grid turbulence over a wide range of Reynolds numbers, , between and . The choice of pressurizable Sulfur Hexafluoride as a working gas makes it possible to reach extremely high Reynolds numbers without changing boundary conditions. Indeed, the Reynolds number we reached were higher than any previous classical grid wind-tunnel experiment. In this talk, we focus on the fundamental question of how fast turbulent energy decays once it has been created, and show that the Reynolds number plays no important role in setting the decay rate if it is high enough
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