We use the ISOPHOT 60 m image of Tuffs et al. (1996) to study the 60 m light distribution and its correlation with radio continuum within the disk of spiral galaxy NGC 6946, and to resolve the long-standing IRAS controversy as to whether the infrared-to-radio continuum ratio, Q, decreases radially out in galaxy disks. Our main results are: (1) The disk at 60 m also appears to follow an exponent...

Yucca Mountain, Nevada is being investigated as the proposed site for geologic disposal of the United States’ high level nuclear waste. A massive effort to collect data for characterization of the thermo-hydrologic behavior of the unsaturated zone is being conducted at the site. Several boreholes have been instrumented by the United States Geological Survey and the Nye County Nuclear Waste Repo...

Mordenite is one of the rarer, but still somehow more widespread, members of the zeolite group of minerals. It has an orthorhombic unit cell of topological spacegroup symmetry Cmcm (a = 18.13; b = 20.5; c = 7.52 Å) with chemical formula: (Ca, Na2, K2)Al2Si10O24⋅7H2O (hydrated calcium sodium potassium aluminum silicate). The structure of mordenite can be described as composed of edge-sharing fiv...

Even with the continual advances made in both computational algorithms and computer hardware used in reservoir modeling studies, large-scale simulation of fluid and heat flow in heterogeneous reservoirs remains a challenge. The problem commonly arises from intensive computational requirement for detailed modeling investigations of real-world reservoirs. This paper presents the application of a ...

The U.S. Department of Energy (DOE) is actively investigating the technical feasibility of permanent disposal of high-level nuclear waste in a repository to be situated in the unsaturated zone (UZ) at Yucca Mountain (YM), Nevada. In this study we investigate, by means of numerical simulation, the transport of radioactive colloids under ambient conditions from the potential repository horizon to...

We reconstruct a Plio-Pleistocene microscopic tephrostratigraphy for DSDP Site 231 in the Gulf of Aden. Systematic microtephrostratigraphy increases the potential for identifying tephra horizons for regional stratigraphic correlation and age control, as well as providing information about eruptive histories. Microtephra reveal three main pulses of volcanism c. 4.0–3.2 Ma, 2.4 Ma and 1.7–1.3 Ma,...

The island of Milos is an active mining site since the Antiquity. Exploitation began with extraction obsidian lumps and volcanic lavas tuffs specific type, that were used as millstones, sulphur alum (alunite). Currently, activity focused on perlite bentonite, even though some years ago, kaolin, silica, pozzolans barite also exploited. bentonite rather a specialty not commodity, it has multifunc...

Obsidians found in silicic domes and rhyolitic tuffs are an ideal system to understand the formation conditions of calc-alkaline felsic magmas. The Optical Absorption Electron Paramagnetic Resonance (EPR) spectroscopic data presented this study demonstrate that Fe-speciation obsidians is different from observed other geological glasses (e.g., basaltic glasses) or synthetic Fe-bearing silicate g...