Ví dụ về việc sử dụng Oxygen isotope trong Tiếng anh và bản dịch của chúng sang Tiếng việt
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BrF5 finds use in oxygen isotope analysis.
We don't see any difference between the Earth's and the moon's oxygen isotopes;
Five million years of glacial cycles are shown,based on oxygen isotope ratio believed to be a good proxy of global ice volume.
Dr Tartese added:“The oxygen isotope pattern was similar to the relationship linking the composition of the sun, asteroids an terrestrial planets.
Lots of evidence from sediment cores and the pollen types, oxygen isotopes and so on.
DrTartèse added that the oxygen isotope pattern had been similar to the relationship linking the composition of the Sun, asteroids and terrestrial planets.
If Theia simply swiped Earth, then the moon would be made mostly of Theia,and the Earth and moon rocks would have different oxygen isotopes.
During the end of the last ice age- oxygen isotope stages 3-2, some 40,000 to 10,000 years ago- it also occurred in Poland(Tomek& Bocheński 2005).
Indirect evidence for this impact scenario comes from rocks collected during the Apollo Moon landings,which show oxygen isotope ratios identical to those of Earth.
Sea-surface temperature(SST)records can be extracted from deep-sea sediment cores using oxygen isotope ratios and the ratio of magnesium to calcium(Mg/Ca) in shell secretions from plankton, from long-chain organic molecules such as alkenone, from tropical corals near the sea surface, and from mollusk shells.[2].
If Theia only side-swiped Earth and formed the Moon, the Moon would be made up mostly of Theia,and Earth and Moon rocks would have unlike oxygen isotope ratios.
The fossil material used is generally calcite or aragonite,however oxygen isotope paleothermometry has also been done of phosphatic fossils using SHRIMP.
Edward Young, lead author of the new study and a UCLA professor of geochemistry and cosmo-chemistry, said,“We don't see any differencebetween the Earth's and the moon's oxygen isotopes; they're indistinguishable.
This boundary isclosely linked with the Oligocene Oi-1 event, an oxygen isotope excursion that marks the beginning of ice sheet coverage on Antarctica.[4][5].
However, after studying moon rock samples brought back by Apollo mission astronauts,scientists from the University of California have discovered that oxygen isotopes are identical to those on Earth.
Some researchers initially thought the discrepancy between the ratio of those oxygen isotopes seen in the solar system and those elsewhere in the galaxy was a matter of measurement error.
The magnetic susceptibility profiles of these sediments have been dated using magnetostratigraphy, which identifies geomagnetic reversals,and correlated with climate indicators such as oxygen isotope stages.
Led by a research team from the Egyptian Museum and the University of California, Santa Cruz,the scientists used oxygen isotope analysis to examine hairs from two baboon mummies that had been preserved in the British Museum.
However, as a complicating factor, the degree of fractionation(i.e. change in isotope ratio) occurring due to photosynthesis is not entirely dependent on the water drawn up by the plant, as fractionation can occur as a result of preferential evaporation of H216O-water bearing lighter oxygen isotopes,[clarify] and other small but significant processes.
In the new study, scientists led by Tomoki Nakamura, a professor at Kyushu University in Japan,analyzed oxygen isotope compositions of three crystals from the comet's halo to better understand their origins.
A research team led by Ohio University geologist Gregory Springer examined the trace metal strontium andcarbon and oxygen isotopes in the stalagmite, which preserved climate conditions averaged over periods as brief as a few years.
Results from a study reported in the September 19,2008 issue of the journal Science has revealed an oxygen isotope signature in the dust that suggests an unexpected mingling of rocky material between the center and edges of the Solar System.
Most relevant to chemostratigraphy in general was the discovery by Harold Urey andCesare Emiliani in the early 1950s that the oxygen isotope variability in the calcite shells of foraminifera could be used as a proxy for past ocean temperatures.
A new analysis of dust from the comet Wild 2, collected in 2004 by NASA's Stardust mission,has revealed an oxygen isotope signature that suggests an unexpected mingling of rocky material between the center and edges of the solar system.