منابع مشابه
Fe-Mg order-disorder in orthopyroxenes
Published data on the distribution of Fe and Mg between the two distinct octahedral sites (M1 and M2) in orthopyroxenes show that the equilibrium Fe-Mg distribution coefficient (KD) is roughly constant at intermediate ferrosilite content (XFs of 0.2 to 0.6) but at low XFs ( 0.2) is either anomalously high (Mössbauer data) or low (XRD data) compared to KD at intermediate XFs. We report an experi...
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AIMS AND METHOD To compare local practice with national guidelines, examine the areas of divergence, and establish complication rates for methadone and diamorphine. Fifty-one patients from Cornwall treated with injectable methadone or diamorphine were interviewed using a standard questionnaire. RESULTS Fewer problems were reported by individuals using injectable diamorphine, though for both dru...
متن کاملInfluence of protons on Fe-Mg interdiffusion in olivine
[1] We report the experimental measurement of Fe-Mg interdiffusivity in olivine along the [001] crystallographic direction in a water-saturated environment at pressures of 0.1 to 6 GPa and temperatures between 1373 and 1450 K. The concentration of water-derived protons in olivine was controlled by varying the water fugacity. The oxygen fugacity was set by the Ni-NiO solid state reaction, while ...
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A well-known maxim, used to put hazards into perspective, reminds the patient that treatment can never be completely safe; there's risk involved even in crossing the road. Whoever invented this saying probably lived or worked in the London borough of Camden. The trek to London for the autumn meeting of the British Society of Gastroenterology reinforced my view that I'm better out of the big cit...
متن کاملSpin crossover in liquid (Mg,Fe)O at extreme conditions
We use first-principles free-energy calculations to predict a pressure-induced spin crossover in the liquid planetary material (Mg,Fe)O, whereby the magnetic moments of Fe ions vanish gradually over a range of hundreds of GPa. Because electronic entropy strongly favors the nonmagnetic low-spin state of Fe, the crossover has a negative effective Clapeyron slope, in stark contrast to the crystall...
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ژورنال
عنوان ژورنال: Geological Magazine
سال: 1947
ISSN: 0016-7568,1469-5081
DOI: 10.1017/s001675680008242x