Results 141 to 150 of about 146,299 (379)
Литосфера, 2016 Case study of the differentiated subvolcanic porphyritic intrusion underlying Magnitogorsk skarn-magnetite deposit revealed regular relations between petrochemistry features of the rocks and composition of halogens (Cl and F) in the accessory apatite ...
T. D. Bocharnikova +3 more
doaj
I.—Henry Clifton Sorby, and the Birth of Microscopical Petrology [PDF]
, 1908 John W. Judd
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Critical expansion points: Mechanical signs of surrounding rock instability
Deep Underground Science and Engineering, EarlyView.This study proposes the Rock Bearing‐Expansion Model (RockBEM) with critical expansion points (CEPs) to quantify post‐peak damage stages in deep‐buried rock masses via plane strain compression test (PSCT). CEP hysteresis&interval ratios reveal bearing performance dynamics and failure severity, advancing mechanistic insights into deep underground rock ...
Jiaqi Wen +4 more
wiley +1 more source
The rise of petrology as a science [PDF]
American Journal of Science, 1918 n ...
openaire +3 more sources
Where do we expect to find deep plant roots?
Ecography, EarlyView.Plant roots have been observed up to 70 m in depth – what would compel a plant to root so deeply? Earlier work shows that the climate, soil and drainage all affect rooting depth, but with conflicting results. For example, both the deepest and shallowest roots are found in arid regions.
G. Annie Mailloux +2 more
wiley +1 more source
Geofluids, 2019 The study area, Pannonian Basin (Central Europe), is characterized by high heat flow and presence of low-enthalpy geothermal waters. In the Szeged Geothermal Systems (Hungary), having Miocene to Pliocene sandstone aquifers with dominantly Na–HCO3-type ...
Andrea Varga +5 more
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Summary of the research work of the Trace Elements Section, Geochemistry and Petrology Branch, for the period April 1, 1948-December 31, 1950 [PDF]
, 1951 John C. Rabbitt
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Energy Science &Engineering, EarlyView.ABSTRACT In the downward mining, the goaf of the upper coal seam and the remaining coal pillars will have a negative impact on the stability of the lower coal seam roadway. If the roadway is excavated in the lower coal seam coal pillar, it is more likely to produce mutual superposition effects, which greatly increases the difficulty of roadway ...
Donghai Jiang +7 more
wiley +1 more source
Pegmatites of Southern California [PDF]
, 1954 For many years the southern California region has attracted the attention of geologists interested in pegmatites and pegmatite deposits, largely because of the well-known gem and lithium occurrences in San Diego and Riverside Counties. These world-famous
Jahns, Richard H.
core
Energy Science &Engineering, EarlyView.ABSTRACT Aiming at the roof control challenges of gob‐side entry retaining in fully mechanized top‐coal caving faces, traditional concrete‐filled steel tube (CFST) support technology exhibits limitations such as slow strength development and complex construction equipment.
Xiaojun Li +3 more
wiley +1 more source