Results 231 to 240 of about 165,943,902 (286)

Hydrogeochemical conceptualization of granitic-urban area for sustainable water resource management: a case study of Daejeon, Korea. [PDF]

Environ Geochem Health
Ko HN, Kim J, Lee KK.
europepmc   +1 more source

Recent developments and trends in the application of strontium and its isotopes in biological related fields [PDF]

TrAC - Trends in Analytical Chemistry, 2017
International audienceStrontium is a chemical element without biological functions in humans. In fact, only two biological roles are known, both as a biomineral constituent.
Inés Coelho, Isabel Castanheira
exaly   +2 more sources

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Strontium Isotopes in Deep-Sea Sediments

Science, 1966
Recent deep-sea sediments, leached of carbonate, have Sr 87 : Sr 86 ratios ranging from 0.7044 to 0.7394. Strontium in the detrital sediment has not equilibrated isotopically with seawater strontium. Amounts of strontium-bearing authigenic material in the clay-mineral assemblage are not great
E J, Dasch, F A, Hills, K K, Turekian
openaire   +2 more sources

Strontium and Neodymium Isotopes

2019
The chapter presents data on Rb–Sr and Sm–Nd TIMS analysis of pyroxenes, plagioclases, gross samples of igneous rocks and sulphide ores. In most Sm–Nd analyses of minerals, the isotope system (pyroxene–plagioclase) does not reflect the age of intrusions and shows a rejuvenated or aged isochronous age.
Yevgeny Bogomolov, Boris Belyatsky, Robert Krymsky, Yury Pushkarev   +3 more
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Strontium isotope stratigraphy

Palaeogeography, Palaeoclimatology, Palaeoecology, 1986
The 87Sr/86Sr ratio of sea water has changed significantly with time in response to the input of varying proportions of Sr derived from continental crust and upper mantle sources, as moderated and buffered by carbonate recycling. Because of these fluctuations, the marine Sr isotope record can be used for stratigraphic correlation and absolute dating ...
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Ground-state properties of strontium isotopes

Physical Review C, 1995
We present systematic constrained Hartree-Fock calculations of ground-state properties of even strontium isotopes ({ital A}=76--100) with the Skyrme interaction. Approximate projection of angular momentum is done after variation by explicit inclusion of the rotational energy {minus}{l_angle}{ital {cflx j}}{sup 2}{sub {ital x}}{r_angle}/J.
, Baran, , Höhenberger
openaire   +2 more sources

High-Resolution Stratigraphy with Strontium Isotopes

Science, 1985
The isotopic ratio of strontium-87 to strontium-86 shows no detectable variation in present-day ocean water but changes slowly over millions of years. The strontium contained in carbonate shells of marine organisms records the ratio of strontium-87 to strontium-86 of the oceans at the time that the shells form. Sedimentary rocks composed of accumulated
D J, Depaolo, B L, Ingram
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Isotope Shift MCHF Calculations in Strontium [PDF]

, 1989
Extensive multiconfiguration Hartree-Fock calculations have been performed in the 5snp 1P°, 5snd 1D and 5snf 1F° series in neutral strontium. The ab initio wavefunctions are used for evaluating the effects of the perturbers 5p2, 4d2 and 5p4d on the field and specific mass shifts of the low-lying levels of these series.
Godefroid, Michel, Vaeck, Nathalie, Hansen, J.E.   +2 more
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Radiochemical separation of strontium by isotopic exchange

Talanta, 1967
Isotopic exchange has been used for the rapid separation of minute quantities of radio-strontium. A number of variables such as agitation time, concentration of strontium in both phases, mode of preparation and aging of the precipitates, were studied and optimized.
I H, Qureshi, M S, Shahdo, S M, Hasany
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Isotope exchange of strontium and molybdate ions in strontium polymolybdates

Journal of Radioanalytical and Nuclear Chemistry, 2002
The heterogeneous isotopic exchange reactions in strontium polymolybdates of Sr2+ and MoO42- ions in the strontium nitrate and sodium molybdate solutions have been studied using 90Sr and 99Mo as tracers. Electrometric methods have been used to study the compositions of strontium molybdates obtained by adding strontium chloride to a progressively ...
G. Atun, N. Bodur
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