In the Yan’an area of Ordos Basin, lithological heterogeneity Chang 7 Member shale is extremely strong. addition, sandy laminae highly developed within system. order to explore gas generation and migration processes shale, geochemical characteristics desorption are comprehensively compared analyzed. this study, rock crushing experiments were carried out obtain samples, samples laminated samples...

Infrared spectroscopic observations have established the presence of hydrocarbon ices on Pluto and other TNOs, but the abundances of such molecules cannot be deduced without accurate optical constants (n, k) and reference spectra. In this paper we present our recent measurements of nearand mid-infrared optical constants for ethane (C2H6) and ethylene (C2H4) in multiple ice phases and at multipl...

Positive and negative secondary ions desorbed from metal foils by bombardment with 252Cf fission products have been investigated by time-of-flight mass spectroscopy. The measurements were performed under UHV conditions using metal foils of Cu, Ni and Al cleaned by Ar-ion etching. Spectra were taken with cleaned surfaces and also under the exposure of H2 , 0 2 , N2 , CO, C2H4 , C2H6 and C3H70H u...

1.1 This test method covers three procedures for extraction and measurement of gases dissolved in electrical insulating oil having a viscosity of 20 cSt (100 SUS) or less at 40°C (104°F), and the identification and determination of the individual component gases extracted. Other methods have been used to perform this analysis. 1.2 The individual component gases that may be identified and determ...

A topological analysis of intracule and extracule densities and their Laplacians computed within the Hartree–Fock approximation is presented. The analysis of the density distributions reveals that among all possible electron–electron interactions in atoms and between atoms in molecules only very few are located rigorously as local maxima. In contrast, they are clearly identified as local minima...

We present the application of a mathematical method reported earlier by which the van der Waals-Platteeuw statistical mechanical model with the Lennard-Jones and Devonshire approximation can be posed as an integral equation with the unknown function being the intermolecular potential between the guest molecules and the host molecules. This method allows us to solve for the potential directly fo...

We report production rates for H2O and eight trace molecules (CO, C2H6, CH4, CH3OH, NH3, H2CO, HCN, C2H2) in the dynamically new, Sun-grazing Comet C/2012 S1 (ISON), using high-resolution spectroscopy at Keck II and the NASA IRTF on 10pre-perihelion dates encompassing heliocentric distances Rh=1.21–0.34 AU. Measured water production rates spanned two orders of magnitude, consistent with a lo...

0021-9517/$ see front matter 2010 Elsevier Inc. A doi:10.1016/j.jcat.2010.01.016 * Corresponding author. Fax: +1 510 642 4778. E-mail address: [email protected] (A.T. Bel The dehydrogenation of ethane to ethene on Sn-promoted Pt supported on calcined hydrotalcite, PtSn/ Mg(Al)O, was investigated with the aim of understanding the effects of Sn on the local environment of the dispersed Pt, ...