In order to investigate the gas separation ability of a column packed with nanozeolitic material, nano NaY zeolite was synthesized and granulated. These uniform granules packed in a chromatographic column were utilized for separation of Xe and Kr under various operating conditions. With regards to the response peaks obtained from trace injections of Xe and Kr into the column, the first and seco...

This paper is a continuation of earlier work by the author on the connection between the logic KR and projective geometry. It contains a simplified construction of KR model structures; as a consequence, it extends the previous results to a much more extensive class of projective spaces and the corresponding modular lattices.

Kr is supposed to be used to study the properties of the windowless gaseous tritium source of the experiment KATRIN. In this work we deduce the amount of Kr which is necessary to determine possible potential inhomogeneities via conversion-electron-line broadening. PACS: 29.30.Dn, 07.81.+a, 02.50.-r

using the gaussian 2003 software and mp2/ 6–311 ++ g** method for he: he, ne:ne andmp2/6-31g method for ar: ar, kr: kr and hf/sto-3g method for xe: xe, the optimizedinteraction energies between two like atoms of rare gases (he, ne, ar, kr and xe) as a functionof the distances between the centers of two considered atoms were evaluated and the resultswere interpreted according to the lennard – jo...

Hyperpolarized (hp) Kr (spin I = 9/2) is a promising gas-phase contrast agent that displays sensitivity to the surface chemistry, surface-to-volume ratio, and surface temperature of the surrounding environment. This proof-of-principle study demonstrates the feasibility of ex vivo hp Kr magnetic resonance imaging (MRI) of lungs using natural abundance krypton gas (11.5% Kr) and excised, but othe...

Introduction: Because of its spin I = 9/2, the noble gas isotope Kr possesses a nuclear electric quadrupole moment that is a source for rapid relaxation. However, its surprisingly long gas-phase T1 times of up to several hundred seconds at ambient pressure allow for Kr hyperpolarization that is 3-4 orders of magnitude above the equilibrium polarization at 9.4 T field strength [1,2]. The quadrup...