Characteristics of hingeless rotors with hub moment feedback controls including experimental rotor frequency response, Volume 1

Wind tunnel tests to determine the dynamic characteristics of hingeless rotors with hub moment feedback controls and to acquire experimental hingeless rotor transfer functions are discussed. Rotor transfer functions were calculated from data acquired during open loop frequency response tests. The transfer functions are linear and present the rotor longitudinal and lateral frequency responses to collective pitch, longitudinal cyclic pitch, and lateral cyclic pitch. The theoretical analysis was based on the rigid blade flapping model coupled with appropriate control system and cyclic pitch actuator equations of motion

Research program to determine rotor response characteristics at high advance ratios Final report

Stability and response characteristics of directly controlled rigid rotors at high advance ratios and correlation of mathematical model with wind tunnel test dat

Biostratigraphy of Cretaceous calcareous nannoplankton

The stratigraphical distribution of selected species of calcareous nannoplankton from sections of Cretaceous deposits in Tunisia, France, The Netherlands, West Germany, Great Britain, Denmark, Turkey, Oman and New Jersey was studied. A number of Late Cretaceous lineages was recognised, on which a proposal for a revised zonation is based. Twenty-six zones are distinguished for the Cretaceous interval. First-order correlations between zones and Cretaceous stage-s(ratotypes are discussed, briefly. The Upper Cretaceous part of the proposed zonation has also been correlated with planktonic foraminiferal zones. One new genus and two new species' are described

Fossil Questions : Early History of Palaentology 600 BC - 1800 AD

Print on Demand version available via http://www.linguaterraebooks.nl - Modern palaeontology is the earth-scientific specialism that investigates the nature and significance of fossils, that is, the study of the remains of once living organisms which have been preserved in earth’s crust. Palaeontology thus investigates the history of life on earth. It does so by applying biological and geological scientific concepts and knowledge. Before its establishment and rise to a fully-fledged scientific state, this special branch of geology passed through a long period of pre-modern development. This book deals with those generally slow and intermittently stagnant developments in the study of those strange ‘medals of Creation’, that is, the period of gestation of palaeontology as the prime study of ancient life

Stepping Stones towards Firenze : Geological Thought between Belief and Science 1475-1665

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Deposits of Earth Science : Printing History of Early Modern Geology 1455-1800

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Deposits of Earth Science: Printing History of Early Modern Geology 1455-1800

Print on Demand version available via http://www.linguaterraebooks.n

Stepping Stones towards Firenze : Geological Thought between Belief and Science 1475-1665

Print on Demand version available via http://www.linguaterraebooks.n

Palaeozoic and Mesozoic igneous activity in the Netherlands: a tectonomagmatic review

To date, igneous rocks, either intrusive or extrusive, have been encountered in the Palaeozoic-Mesozoic sedimentary series of the Netherlands in some 65 exploration and production wells. Following 17 new isotopic K/Ar age determinations of the recovered rock material (amounting to a total of 28 isotopic ages from 21 different wells), analysis of the stratigraphy distribution of the penetrated igneous rock bodies showed that the timing of their emplacement was importantly controlled by orogenic phases involving intra-plate wrench and rift tectonics. Magmatism coincided with the Acadian (Late Devonian), Sudetian (early Late Carboniferous), Saalian (Early Permian), Early Kimmerian (late Late Triassic), Mid-Kimmerian (Late Jurassic), Late Kimmerian (earliest Cretaceous) and Austrian (latest Early Cretaceous) tectonic phases. This synchroneity presumably reflects (broadly) coeval structural reorganizations of respectively the Baltica/Fennoscandinavia-Laurentia/Greenland, Laurussia-Gondwana, African-Eurasia and Greenland/Rockall-Eurasia plate assemblies. Through their concomitant changes of the intra-plate tectonic stress regime, inter-plate motions induced intra-plate tectonism and magmatism. These plate-tectonics related events determined the tectonomagmatic history of the Dutch realm by inducing the formation of localized centres, as well as isolated spot occurrences, of igneous activity. Some of these centres were active at (about) the same time. At a number of centres igneous activity re-occurred after a long period of time