Schroeckingerite crystals have been found at Moab, Utah, and San Isidro, Argentina. They are orthorhombic pseudohexagonal, fl ttened on {001 } with additional forms {010}, [ 110 ] , { 014 } , { 012 } , { 011 } , { 021 } , { 041 } , [ 1 l s ] , { 114 } , { 112 } , [ 111 ] . Un i t ce l l d imensions arel ao:9.69 A, bo:16.83, co:14.26 ({r0:b0:r0:0.5758:1:0.8473). Space group Cmmm. Z:4. Optically ...

High-resolution anion photoelectron spectra are reported for the group 4 metal dioxide clusters Ti2O4(-) and Zr2O4(-). Slow photoelectron velocity-map imaging (SEVI) spectroscopy of cryogenically cooled, mass-selected anions yields photoelectron spectra with submillielectronvolt resolution, revealing extensive and well-resolved vibrational progressions. By comparison of the spectra with Franck-...

Let Ω 0 be an-open bounded domain in R N ≥ 3 and p∗ pN/ N − p . We consider the following quasilinear elliptic system of two equations inW 0 Ω ×W 1,p 0 Ω : −Δpu λf x |u|q−2u α/ α β h x |u|α−2u|v|β,−Δpv μg x |v|q−2v β/ α β h x |u|α|v|β−2v, where λ, μ > 0, Δp denotes the p-Laplacian operator, 1 ≤ q < p < N,α, β > 1 satisfy p < α β ≤ p∗, and f, g, h are continuous functions on Ω which are somewher...

A fundamental notion in metric graph theory is that of the interval function I : V × V → 2V − {∅} of a (finite) connected graph G = (V,E), where I(u, v) = { w | d(u, w) + d(w, v) = d(u, v) } is the interval between u and v. An obvious question is whether I can be characterized in a nice way amongst all functions F : V × V → 2V − {∅}. This was done in [13, 14, 16] by axioms in terms of propertie...