Abstract. The problem of the local summability of the sub-Riemannian mean curvature H of a hypersurface M in the Heisenberg group, or in more general Carnot groups, near the characteristic set of M arises naturally in several questions in geometric measure theory. We construct an example which shows that the sub-Riemannian mean curvature H of a C2 surface M in the Heisenberg group H1 in general...

Abstract We prepared crystals of (C 6 H 5 C n 2 NH 3 ) PbBr 4 ( = 2, 3, 4), and evaluated their photoluminescence scintillation characteristics. According to the spectra under 340 nm excitation light, a peak at around 410 due free exciton emissions appeared in (2PEA), (3PPA) 8 (4PBA). The quantum efficiencies 2PEA, 3PPA 4PBA were 0.24, 0.01 0.04, respectively. In scintillation, sharp originatin...

Diels–Alder [2+4] cycloaddition products of the reaction between C20 and C4H4X2 or C2O2X2 (X = H, F, Cl, CH3, NH2, NO2, and OH) were studied atB3LYP level of theory with 6-31G, 6-31G(d, p) and 6-311G(d, p) basis...