Results 41 to 50 of about 868 (182)

Alkali-silica reaction (ASR) - Investigation of crystallographic parameters of natural sands by backscattered electron diffraction

Revista IBRACON de Estruturas e Materiais, 2021
: This study involved analyzing several natural sands to ascertain the possible causes for distress due to ASR. The analyses were performed using the following techniques: X-ray diffractometry, accelerated mortar bar tests (AMBT), electron backscattering
Kleber Franke Portella, Leonardo Evangelista Lagoeiro, Jeferson Luiz Bronholo, Dayane de Cristo Miranda, Mariana D’Orey Gaivão Portella Bragança, Bruna Gomes Dias, Nicole Pagan Hasparyk, Selmo Chapira Kuperman   +7 more
doaj   +1 more source

Computing Effective Elastic Properties From Microtomographic Images: An Efficient 3D Digital Rock Workflow

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 6, June 2026.
Abstract Digital rock physics (DRP), using high‐resolution 3D microtomographic rock images, is widely employed to predict elastic and transport properties of subsurface formations. Accurate microstructural characterization is often hindered by limited image resolution and overlapping grayscale values of minerals. Consequently, DRP simulations are often
Shib Sankar Ganguli, Sajjad Foroughi, Branko Bijeljic, Martin J. Blunt   +3 more
wiley   +1 more source

Geochemical Characteristics and Their Geological Significance of Zircon and Apatite From the Wunugetushan Porphyry Cu–Mo Deposit, Inner Mongolia, NE China

Acta Geologica Sinica - English Edition, Volume 100, Issue 3, Page 795-813, June 2026.
The key factors making the monzogranitic porphyry fertile for mineralization, including its high Cl, S, and H2O contents, high oxidation state, significant fluid exsolution, and multiple recharges of deep‐seated mafic magma, were all critical for the formation of the Wunugetushan porphyry Cu‐Mo deposit. ABSTRACT The Wunugetushan (Wushan) porphyry Cu–Mo
Genyuan JI, Sihong Jiang, Yang Cheng, Hongyan Bao, Huachuan Zhang   +4 more
wiley   +1 more source

Investigating Technology and Raw Materials Source of the Archaic and Classical Architectural Terracottas From the Athenaion in Castro (Apulia, Italy)

Archaeometry, Volume 68, Issue 3, Page 512-526, June 2026.
ABSTRACT Since 2000, archaeological excavations have brought to light the sanctuary of Athena in Castro (Apulia, Italy), including terracotta roofs dated between the 6th and 4th centuries bce. Based on their morphological and stylistic features, it is suggested that the terracotta items were manufactured in the Greek colony of Taras (modern Taranto ...
M. M. N. Franceschini, T. Ismaelli, S. Vettori, L. Chelazzi, S. Ciattini, F. Di Benedetto, C. Grifa, E. Cantisani   +7 more
wiley   +1 more source

Ionoluminiscencia de silicatos de utilización en cerámica a temperaturas criogenicas

Boletín de la Sociedad Española de Cerámica y Vidrio, 2004
Requirements on accurate physical properties need new characterization techniques for structural defects. The use of light ions such as H+ and He+ with MeV energies allows penetration to a depth of several microns in most materials producing strong ...
García-Guinea, J., Hole, D., Finch, A., Correcher, V., Valle-Fuentes, F. J., Can, N., Townsend, P. D.   +6 more
doaj  

First-Principles Study of the Structural Evolution of Microcline Under High Pressure

Crystals
Microcline is an important rock-forming mineral in the Earth’s crust, and characterizing its structural behavior under compression is essential for understanding the high-pressure response of feldspar minerals under geological conditions.
Baoyun Wang, Meisu Xiang
doaj   +1 more source

Ice nucleation efficiency of natural dust samples in the immersion mode [PDF]

Atmospheric Chemistry and Physics, 2016
A total of 12 natural surface dust samples, which were surface-collected on four continents, most of them in dust source regions, were investigated with respect to their ice nucleation activity.
L. Kaufmann, C. Marcolli, C. Marcolli, J. Hofer, J. Hofer, V. Pinti, C. R. Hoyle, C. R. Hoyle, T. Peter   +8 more
doaj   +1 more source

Microbially generated ferruginous crusts: A potential biosignature of continental input in coastal settings

Sedimentology, Volume 73, Issue 4, Page 1225-1243, June 2026.
ABSTRACT Thin ferruginous sandy crusts are common on top of sandstone beds in the Early Permian post‐glacial deposits of the Paraná Basin in southern Brazil. These crusts usually preserve wrinkle structures, suggesting that they might be a product of microbial mediation.
Patrícia Weschenfelder, Renata Guimarães Netto, Alisson Klayton Martins   +2 more
wiley   +1 more source

Stratified Pit Features at the Presbytère de l'Ancienne‐Lorette (CeEu‐11) and the Fort Odanak (CaFe‐7) Sites in Québec, Canada: A Comparative Geoarchaeological Analysis

Geoarchaeology, Volume 41, Issue 3, May/June 2026.
ABSTRACT A geoarcheological study of two large, stratified Indigenous pit features discovered at two Jesuit mission sites in Québec (Canada) was carried out to offer a detailed documentation of their contents and better understand their use over time. One of the pits is a 17th c.
Sarah Robert, Allison Bain, Najat Bhiry
wiley   +1 more source

The evolution of the Čanište epidote-bearing pegmatite, Republic of Macedonia: evidence from mineralogical and geochemical features

Geologia Croatica, 2012
The epidote-bearing Čanište pegmatite and adjacent Upper Carboniferous granodiorites cut Precambrian gneises, at the western slopes of the Selečka Mts., the Eastern Pelagonian zone, FYRO Macedonia.
Sabina Strmić Palinkaš, Vladimir Bermanec, Ladislav A. Palinkaš, Blažo Boev, Robert A. Gault, Walter Prochaska, Ronald J. Bakker   +6 more
doaj   +1 more source