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Showing 1 to 7 of 7 for “"Secular variations"”.
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HlGH RESOLUTION PALAEOMAGNETIC ANALYSES OF CRETACEOUS SHALLOW WATER CARBONATES
… some of which are likely to be comparable with secular variations of the geomagnetic field in the Early Cretaceous. Polarity changes are present, which correlate to the Geomagnetic Polarity Scale. Longer Normal polarities were found at about 1,000,000 years and in them the secular variations …
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The motion of a lunar satellite under the influence of the moons noncentral force field
… which give the short period, long period and secular variations of a slightly modified set of Delauney elements. A typical set of orbital characteristics are utilized to obtain an estimate of the order of magnitude of the variations in the various elements.
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ΛΥΣΕΙΣ ΙΣΟΡΡΟΠΙΑΣ ΚΑΙ ΕΥΣΤΑΘΕΙΑ ΣΕ ΤΡΟΧΙΕΣ ΑΣΤΕΡΟΕΙΔΩΝ ΥΠΟ ΤΗΝ ΕΠΙΔΡΑΣΗ ΑΙΩΝΙΩΝ ΠΑΡΕΛΞΕΩΝ
IN THIS THESIS, WE STUDY THE SECULAR VARIATIONS IN THE RESTRICTED THREE BODY AND, PROPERLY IN THE MODEL SUN-JUPITER- ASTEROID. WE TAKE THE SECULAR PART OF THEDISTURBING FUNCTION UP TO THE FOURTH ORDER WITH RESPECT TO THE ECCENTRICITY AND THE INCLINATION TERMS. WE DEVELOP AN EXPLICIT NUMERICAL …
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Results of true-anomaly regularization in orbital mechanics
… averaged differential equations governing secular variations of the regular orbital elements in the true-anomaly domain. Complete universal expressions are given for the Keplerian state transition matrix in terms of the orbital transfer angle, and a simple midcourse guidance scheme is …
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Setting the Holocene clock using varved lake sediments in Sweden
… dating, tephra isochrones and paleomagnetic secular variations were established for two sediment sequences in Värmland. These are the longest geological records with an annual resolution known to exist in Sweden. Three mid-Holocene Icelandic tephra horizons were identified within 1-cm …
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Pollen analysis, chronology and palaeomagnetism of three Late Weichselian sites in southern Sweden
… (GRIP) years BP, respectively. Palaeomagnetic secular variation records for the three sites are presented. Among the series of directional changes, the main characteristic, which can be found in all stratigraphies, is a broad westerly declination swing between c. 13,000 and 12,000 calendar …
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Earth’s oceanic oxygen history from Phanerozoic to Pleistocene glacial cycles: insights from the carbonate iodine-to-calcium proxy
… history, because few redox proxies can track secular variations in dissolved oxygen concentrations around threshold values for metazoan survival in the upper ocean. To address this question, we measured I/Ca in an extensive Phanerozoic collection of shallow marine carbonates and simulated …