Two robust combinations of spectral editing techniques with 2D (13)C-(13)C NMR have been developed for characterizing the aromatic components of (13)C-enriched low-temperature carbon materials. One method (exchange with protonated and nonprotonated spectral editing, EXPANSE) selects cross peaks of protonated and nearby nonprotonated carbons, while the other technique, dipolar-dephased double-qu...

Given two disjoint convex sets A and B in Ed, a hyperplane h in Ed separates them if A lies on one of the half spaces defined by h while B lies on the complementary half space. Given a collection F of convex sets in Ed we say F is separated by a set of hyperplanes H if every pair of elements of F i s separated by some hyperplane of H. We deal here with the case that the convex sets are all poin...

We present a simple method to deal with caustics in the semiclassical approximation to the thermal density matrix of a particle moving on the line. For simplicity, only its diagonal elements are considered. The only ingredient we require is the knowledge of the extrema of the Euclidean action. The procedure makes use of complex trajectories, and is applied to the quartic double-well potential.

Two-photon fluorescence polarisation and stimulated emission depletion dynamics are investigated in three high two -photon cross-section push-push polyenes: OM62, LP79 and OM77 and compared to the behaviour of a standard fluorophore (rhodamine 6G). Two-photon fluorescence anisotropy measurements (R(0) and Ω) were undertaken using picosecond time-correlated single photon counting (TCSPC). For OM...

In this note we consider the on-line Ramsey numbers R(Pn, Pm) for paths. Using a high performance computing clusters, we calculated the values for off-diagonal numbers for paths of lengths at most 8. Also, we were able to check thatR(P9, P9) = 17, thus solving the problem raised in [5].

In a recent paper I concluded that the neutrino background is important for calculating neutrino flavor evolution in supernovae, and including it weakens the connection between r-process nucleosynthesis and cosmologically relevant neutrino masses. Comments on this paper have been posted to this bulletin board; one by J. Cline and the other by Y.Z. Qian and G.M. Fuller. Here I briefly discuss th...