Search results for "PLUT"
showing 10 items of 153 documents
Early Pan-African evolution of the basement around Elat, Israel,and the Sinai Peninsula revealed by single-zircon evaporation dating, and implication…
1990
We report 2<r7Pb/206Pb single-zircon evaporation ages for early Pan-African rocks from southern Israel and the northeastern Sinai Peninsula, the northernmost extension of the Arabian-Nubian shield. The oldest rocks are metamorphic schists of presumed island-arc derivation; detrital zircons date the source terrain at ca. 800-820 Ma. A major phase of tonalite-trondhjemite plutonism occurred at ca. 760-780 Ma; more evolved granitic rocks were emplaced at about 745 Ma. A metagabbro-met adiorite complex reflects the youngest igneous phase at ca. 640 Ma. We Find no evidence for pre-Pan-African crust, and our data document important crust-forming events that correlate with similar episodes elsewhe…
Observador agudo de nuestro tiempo
2010
Constraints on Earth accretion deduced from noble metals in the oceanic mantle
1998
If the Earth's mantle were in equilibrium with its core, the mantle would contain three orders of magnitude less of the noble metals (platinum-group elements Pt, Os, Ir, Ru, Pd and Rh, plus Au and Re) than are observed. An explanation put forward to account for this disparity has been that the last 1% of the Earth's accretion occurred after the iron-rich core had separated from the mantle1,2. Recent debate has accordingly centred on which meteorite class or classes made up this ‘late veneer’ of accretion3. Here we present analyses of noble-metal concentrations in oceanic peridotites (plutonic rocks which are thought to represent samples of the Earth's upper mantle). We find that the average…
Dynamical environments of MU69: a state of chaotic clearing
2018
AbstractThe second (after Pluto) plausible target object for the New Horizons mission is 2014 MU69. It is a classical TNO, a primordial contact binary. Identifying any material in the vicinities of a target object is of an especial concern for planning cosmic fly-byes, as it is hazardous for a space probe. Luckily, no such material has been reported for MU69 up to now. The point of our report is that this lucky absence is just a dynamical consequence of the physical nature of MU69. Spinning gravitating dumbbells create zones of dynamical chaos around them, and this has a clearing effect: any material put in orbits around a rotating dumbbell (e.g., any material ejected from its surface) cann…
Plutarco. L'origine del freddo. Se sia più utile l'acqua o il fuoco.
2012
Introduzione, testo critico, traduzione e note di commento ai due opuscoli compresi nei Moralia.
La medicina ellenistica in Plutarco
2004
Il saggio, attraverso l'analisi di svariati passi dei "Moralia" e delle "Vite" contenenti citazioni e rimandi espliciti ai più importanti esponenti della medicina ellenistica o semplici allusioni alle loro teorie, ricostruisce il debito di Plutarco nei confronti di quel sapere, mostrando come, insieme ai trattati ippocratici, anche gli scritti di Erofilo, Erasistrato, Asclepiade di Bitinia, Temisone di Laodicea, dovessero far parte della 'biblioteca' di Plutarco. L'esame delle testimonianze evidenzia altresì come, al pari del suo grande contemporaneo Galeno, anche Plutarco reinterpreta il patrimonio della medicina ippocratica ed ellenistica attraverso il filtro di un platonismo di fondo (Pl…
Recensione del volume di Th.S. Schmidt, "Plutarque et les Barbares. La rhétorique d'une image", Collection d'études classiques 14, éditions Peeters, …
2004
Plutarco e la lettura nel simposio.
2009
ON THE “SOLAR SYSTEM SMALL BODIES” ASTROPLATE PROJECT OF THE UKRAINIAN VIRTUAL OBSERVATORY
2019
The UkrVO Joint Digital Archive of astro- plates and the newest digitized data processing services al- lowed us to form a new approach for the creation of catalogs of astrometric and photometric characteristics of the Solar System bodies. Given this, the main goal of this approach was not only to complete the processing with the best possi- ble accuracy of high-quality and unprocessed earlier photo- graphic observations of the Solar System bodies but also to find new original data from these observations. As a result, more than 6,500 new astrometric positions and stellar magnitudes of asteroids, and 3,036 positions of outer planets (Pluto, Uranus, Neptune, Saturn, Jupiter) and their satelli…