Bibliography of terrestrial impact structures

This bibliography lists 105 terrestrial impact structures, of which 12 are proven structures, that is, structures associated with meteorites, and 93 are probable. Of the 93 probable structures, 18 are known to contain rocks with meteoritic components or to be enriched in meteoritic signature-elements, both of which enhance their probability of having originated by impact. Many of the structures investigated in the USSR to date are subsurface features that are completely or partly buried by sedimentary rocks. At least 16 buried impact structures have already been identified in North America and Europe. No proven nor probable submarine impact structure rising above the ocean floor is presently known; none has been found in Antarctica or Greenland. An attempt has been made to cite for each impact structure all literature published prior to mid-1983. The structures are presented in alphabetical order by continent, and their geographic distribution is indicated on a sketch map of each continent in which they occur. They are also listed tables in: (1) alphabetical order, (2) order of increasing latitude, (3) order of decreasing diameter, and (4) order of increasing geologic age

Preparation of a geologic photo map and hydrologic study of the Yemen Arab Republic

There are no author-identified significant results in this report

Orientational Effects and Random Mixing in 1-Alkanol + Alkanone Mixtures

1-Alkanol + alkanone systems have been investigated through the data analysis of molar excess functions, enthalpies, isobaric heat capacities, volumes and entropies, and using the Flory model and the formalism of the concentrationconcentration structure factor (SCC(0)). The enthalpy of the hydroxyl-carbonyl interactions has been evaluated. These interactions are stronger in mixtures with shorter alcohols (methanol-1-butanol) and 2-propanone or 2-butanone. However, effects related to the self-association of alcohols and to solvation between unlike molecules are of minor importance when compared with those which arise from dipolar interactions. Physical interactions are more relevant in mixtures with longer 1-alkanols. The studied systems are characterized by large structural effects. The variation of the molar excess enthalpy with the alcohol size along systems with a given ketone or with the alkanone size in solutions with a given alcohol are discussed in terms of the different contributions to this excess function. Mixtures with methanol show rather large orientational effects. The random mixing hypothesis is attained to a large extent for mixtures with 1-alkanols ≠ methanol and 2-alkanones. Steric effects and cyclization lead to stronger orientational effects in mixtures with 3-pentanone, 4-heptanone, or cyclohexanone. The increase of temperature weakens orientational effects. Results from SCC(0) calculations show that homocoordination is predominant and support conclusions obtained from the Flory model.Ministerio de Ciencia e Innovación, under Project FIS2010-1695

Le calcul des conductivités (thermique, électrique,etc. ) des roches, selon la théorie d'Ondracek généralisée

On peut calculer les conductivités (thermique, électrique, etc. ) des roches à partir des conductivités des minéraux constitutifs, des fractions volumiques, de la forme des grains, représentée par un ellipsoïde moyen équivalent(EME), et de leur orientation moyenne. La théorie présentée étend aux ellipsoïdes quelconques la théorie d'Ondracek jusqu'ici limitée aux ellipsoïdes de révolution

A New Working Mode for Molecular Springs: Water Intrusion Induced by Cooling and Associated Isobaric Heat Capacity Change of {ZIF-8 + Water} System.

International audienceHydrophobic microporous metal–organic framework ZIF-8 combined with water forms a molecular spring (MS), which by the forced intrusion of water into the pores and its spontaneous extrusion can store and restore large amounts of mechanical and thermal energy. Using scanning transitiometry technique, we demonstrate that the simultaneous effect of temperature and pressure on the porosity of ZIF-8 leads to a non-standard temperature dependence of intrusion and extrusion pressures of MS, which allows to provoke water intrusion into the hydrophobic pores of ZIF-8 by decreasing the temperature of the system under constant pressure. A remarkably strong effect of intrusion on the isobaric heat-capacity of {ZIF-8 + water} MS is discovered

Synergetic effect of temperature and pressure on energetic and structural characteristics of {ZIF-8 + water} molecular spring.

International audienceMetal–organic frameworks (MOFs) and particularly their subclass – Zeolite Imidazolate Frameworks (ZIFs) – are used for a variety of applications including particularly energy storage. Highly porous MOFs mixed with non-wetting liquids can be used to form molecular springs (MS) for efficient mechanical and thermal energy storage/transformation. In this paper by means of high-pressure calorimetry the energetic characteristics of {ZIF-8 + water} MS were investigated in wide temperature and pressure ranges. Unexpectedly XRD measurements show that the concomitant effects of temperature and pressure on {ZIF-8 + water} MS leads to an irreversible change of the ZIF-8 structure, transforming its symmetry from cubic to orthorhombic. Whereas, previous studies have demonstrated the stability of ZIF-8 under either high pressure or high temperature