منابع مشابه
Preferential low-pH dissolution of pyroxene in plagioclase–pyroxene mixtures: Implications for martian surface materials
Acid weathering of plagioclase–pyroxene mixtures has been investigated with an open system kinetic dissolution model. The modeling reveals that elevated plagioclase/pyroxene ratios observed in some low-albedo martian regions and atmospheric dust could be partially caused by preferential dissolution of pyroxenes at pHs below ∼3–4. Surface materials with smaller grain sizes, affected by lower pH ...
متن کاملPyroxene Europium Valence Oxybarometer. Effects of Pyroxene Composition, Melt Composition and Crystallization Kinetics
Introduction: The behavior of multivalent elements such as iron, chromium, vanadium, and euro-pium in magmatic systems reflects the f O2 of the environment. The oxidation state of these elements will influence the mineral assemblage, crystallization sequence , and element partitioning[1]. The effect of f O2 on the relative proportions of divalent and trivalent Eu has proven to be a useful tool ...
متن کاملglobal results on some nonlinear partial differential equations for direct and inverse problems
در این رساله به بررسی رفتار جواب های رده ای از معادلات دیفرانسیل با مشتقات جزیی در دامنه های کراندار می پردازیم . این معادلات به فرم نیم-خطی و غیر خطی برای مسایل مستقیم و معکوس مورد مطالعه قرار می گیرند . به ویژه، تاثیر شرایط مختلف فیزیکی را در مساله، نظیر وجود موانع و منابع، پراکندگی و چسبندگی در معادلات موج و گرما بررسی می کنیم و به دنبال شرایطی می گردیم که متضمن وجود سراسری یا عدم وجود سراسر...
Model pyroxenes I: Ideal pyroxene topologies
Ideal pyroxenes are hypothetical structures based on ideal closest-packed arrangements of O anions. They are modeled after observed pyroxene structures and have the general formula M2M1T2O6, where M2 and M1 represent octahedrally coordinated cations, and T represents tetrahedrally coordinated cations. An algorithm has been created to construct all possible ideal pyroxenes based on closest-packe...
متن کاملTransforming Undecidable Synthesis Problems into Decidable Problems
Synthesis holds the promise to revolutionize the development of complex systems by automating the translation from specifications to implementations. Synthesis algorithms are based on the same level of mathematical rigor as verification algorithms but can be applied at earlier development stages, when only parts of the design are available. Given a formal specification of the desired system pro...
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ژورنال
عنوان ژورنال: Journal of the Mineralogical Society of Japan
سال: 1967
ISSN: 1883-7018,0454-1146
DOI: 10.2465/gkk1952.8.129