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111.
Sema Salur 《Proceedings of the American Mathematical Society》2006,134(10):3049-3056
Asymptotically cylindrical Ricci-flat manifolds play a key role in constructing Topological Quantum Field Theories. It is particularly important to understand their behavior at the cylindrical ends and the natural restrictions on the geometry. In this paper we show that an orientable, connected, asymptotically cylindrical manifold with Ricci-flat metric can have at most two cylindrical ends. In the case where there are two such cylindrical ends, then there is reduction in the holonomy group Hol and is a cylinder.
112.
Sabriye Yusan Mahmoud A. A. Aslani D. Alkim Turkozu Hasan A. Aycan Sule Aytas Sema Akyil 《Journal of Radioanalytical and Nuclear Chemistry》2010,283(1):231-238
In this work, sorption of uranium ions on volcanic tuff collected from the deposits located at the Tendurek of Eastern Turkey
was investigated in batch technique. The effect of different parameters such as pH of the medium, contact time, uranium concentration
and temperature were investigated. The maximum removal of U(VI) was found to be 68% at pH 5.0, initial U(VI) concentration
of 75 mg L−1 and 30 °C. Thermodynamic parameters, such as enthalpy of adsorption ∆H°, free energy change ∆G° and entropy change ∆S° have been also calculated and interpreted. The suitability of the Langmuir, Freundlich and Dubinin-Radushkhevic adsorption
models to the equilibrium data was investigated for uranium-volcanic tuff system. The results suggest that volcanic tuff can
be used as efficient and cost effective adsorbents for uranium ion removal. 相似文献