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  • Author or Editor: Young Suh x
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Summary  

We introduce the notion of recurrent shape operator for a real hypersurface M in the complex two-plane Grassmannians G 2(C m +2) and give a non-existence property of real hypersurfaces in G 2(C m +2) with the recurrent shape operator.

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Abstract

We give a pinching condition for compact minimal hypersurfaces in complex two-plane Grassmannians G 2(ℂm+2) in terms of sectional curvature and the squared norm of the shape operator.

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Abstract  

The chromatographic separation of lithium isotopes was investigated by chemical exchange with the recently synthesized polymer-bound dibenzo pyridino diamide azacrown (DBPDA) and reduced dibenzo pyridino diamide azacrown (RDBPDA). Column chromatography was employed for the determination of the effect of solvents and ligand conformation on the separation coefficients. The maximum separation coefficients, , for the DBPDA and RDBPDA at 20.0±0.02°C with acetonitrile as eluent, were found to be 0.034±0.002 and 0.035±0.002, respectively. The isotope separation coefficient and adsorption capability of the lithium ion on the DBPDA and RDBPDA were only slightly dependent on ligand structure, but strongly dependent on the solvent. DBPDA and RDBPDA appeared to have almost the same value for the isotope separation coefficient of lithium.

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Abstract  

The purpose of this paper is to give a characterization of real hypersurfaces of type A0, A in a quaternionic hyperbolic space QH m by the covariant derivative of the second fundamental tensor.

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Abstract  

The purpose of this paper is to give a non-existence property with the Lie derivative of the structure tensors ϕi and some characterizations of real hypersurfaces of type A 1, A 2 in a quaternionic projective space QP m in terms of the Lie derivatives of the second fundamental tensor A and the induced Riemannian metric g on the distribution D = Span {U 2, U 2, U 3}.

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