Results 61 to 70 of about 25,598 (206)

A rheological investigation of vesicular rhyolite [PDF]

, 1992
The rheology of vesiculating rhyolitic systems exerts a strong control on the transport of silicic magmas in the subvolcanic to volcanic environments. We present here an investigation of vesiculating and vesiculated rhyolites using dilatometric methods ...
Bagdassarov, Nikolai, Dingwell, Donald B.   +1 more
core   +1 more source

Semiquantitative Analysis of Phase Evolution and Viscosity in Perlite

International Journal of Ceramic Engineering &Science, Volume 8, Issue 2, March 2026.
XRD spectra of raw perlite powder (particle size <44 µm) with 10 wt.% ZnO added as an internal standard for semiquantitative analysis. ABSTRACT Perlite is a noncrystalline volcanic rock with rhyolitic composition that expands four to 20 times its original volume when heated, forming a porous structure widely used in filtration, catalysis, and ...
Danqi Yin, Jessica J. Sly, Cristian Perez Velasquez, Nichole M. Wonderling, Dean Anderson, Maziar Montazerian, Philipp Hunziker, Ivan A. Cornejo, John C. Mauro   +8 more
wiley   +1 more source

Geological Sources of Obsidian on Lipari and Artifact Production and Distribution in the Neolithic and Bronze Age Central Mediterranean

Open Archaeology, 2019
The Aeolian island of Lipari, just north of eastern Sicily, was a major geological source of high quality obsidian that was volcanically formed in the Late Mesolithic, followed by another major production in the 1st millennium AD. A much earlier volcanic
Tykot Robert H.
doaj   +1 more source

Silica in Protoplanetary Disks

, 2008
Mid-infrared spectra of a few T Tauri stars (TTS) taken with the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope show prominent narrow emission features indicating silica (crystalline silicon dioxide).
A. Li, A. R. Basu, Alexander, Armus, B. A. Sargent, Barkume, Barsony, Benzerara, Binns, Bohren, Bouvier, Bowen, Bowen, Brearley, C. J. Bohac, C. Tayrien, Calvet, Calvet, Chen, Chiar, Cohen, D'Alessio, D'Alessio, D. M. Watson, de Pater, de Zeeuw, Dodd, Dorschner, E. Furlan, Edgar, Emery, Fabian, Furlan, G. C. Sloan, Grün, Hanner, Harker, Harker, Heaney, Hemley, Henning, Herbig, Honda, Houck, J. D. Green, Jaeger, K. H. Kim, Kamp, Kastner, Kemper, Kimura, Klein, Koike, Li, Li, Luhman, Luhman, M. K. McClure, Marshall, Metchev, Mikouchi, Mutschke, Norton, P. Manoj, Palik, Pascucci, Pilipp, Plyusnina, Posch, Prato, Preibisch, Reipurth, Rietmeijer, Rietmeijer, Rietmeijer, Sargent, Schaefer, Silverstone, Tuttle, Uchida, W. J. Forrest, Werner, Wilking   +82 more
core   +1 more source

The Neolithic Site of Piano dei Cardoni in the Island of Ustica (Italy): Minero‐Petrographic and Chemical Characterization of the Ceramic Finds and Clayey Raw Materials

Geoarchaeology, Volume 41, Issue 2, March/April 2026.
ABSTRACT This paper presents the results of minero‐petrographic and chemical analyses of pottery and potential local raw materials from Ustica, a small volcanic island off the coast of Palermo (Sicily), inhabited during the Middle Neolithic. Typologically, the pottery shows cultural connections to the Bicromica and Serra d'Alto traditions, linking ...
G. Montana, C. Speciale, G. Battaglia, L. Randazzo, G. Carnevale, M. V. Antonopoulou, A. Magrì   +6 more
wiley   +1 more source

Importation of Obsidian at Cerro Palenque, Honduras: Results of an Analysis by EDXRF

, 2004
The results of source analysis by EDXRF of obsidian artifacts from the Mesoamerican site of Cerro Palenque in Honduras are reported and changes over time discussed. Sources of obsidian include Ixtepeque, El Chayal, Jalapa, San Martin Jilotepeque, and San
Hendon, Julia A.
core  

Unravelling textural heterogeneity in obsidian:shear-induced outgassing in the Rocche Rosse flow [PDF]

, 2015
Obsidian flow emplacement is a complex and understudied aspect of silicic volcanism. Of particular importance is the question of how highly viscous magma can lose sufficient gas in order to erupt effusively as a lava flow.
Baumgartner, L., Carrichi, Luca, Mader, Heidi, Mueller, Sebastian, Pistone, Matthia, Shields, Jessica, Tuffen, Hugh   +6 more
core   +4 more sources

In Vitro and Clinical Evaluation of Potential Interactions of Bemnifosbuvir with Drug Transporters

The Journal of Clinical Pharmacology, Volume 66, Issue 2, February 2026.
Abstract Bemnifosbuvir is a novel oral guanosine nucleotide prodrug candidate for the treatment of chronic hepatitis C virus infection. Potential drug–drug interactions (DDIs) of bemnifosbuvir as a substrate or perpetrator with regard to ATP‐binding cassette (ABC) and solute carrier (SLC) transporters were evaluated in vitro and in clinical studies ...
Xiao‐Jian Zhou, Alex Vo, Gaetano Morelli, Maureen Montrond, Shannan Lynch, Keith Pietropaolo, Bruce Belanger, Arantxa Horga, Nancy Agrawal, Janet Hammond   +9 more
wiley   +1 more source

Obsidian at the Maddalena di Muccia (Marche, Central Italy) Archaeological Site: Evidence for Three Volcanic Sources in a Multi-Phase Context

Heritage
This paper presents the compositional characterisation of obsidian artefacts from the archaeological site of Maddalena di Muccia (Marche, Central Italy).
Pasquale Acquafredda, Italo Maria Muntoni, Cecilia Conati Barbaro, Elisabetta Gadaleta, Mauro Pallara   +4 more
doaj   +1 more source

Sound Velocities and Structural Transitions of Endmember and Fe, Al, Mg, Ti‐Bearing CaSiO3 Glasses Up to 23 GPa

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 2, February 2026.
Abstract The study of silicate glasses is important to understand the physical and chemical properties of silicate melts under high‐pressure conditions relevant to planetary interiors. We conducted in situ Brillouin spectroscopy measurements on two endmember, low‐impurity CaSiO3 glasses and one Fe, Al, Mg, Ti‐bearing CaSiO3 glass up to 23 GPa.
Wenhao Su, Wen‐Yi Zhou, Jiasen Hu, Ming Hao, Anne Pommier, Jin S. Zhang   +5 more
wiley   +1 more source