Results 81 to 90 of about 86,930 (291)

Australian fossil decapod crustacea : faunal and environmental changes [PDF]

open access: yes, 1972
2 v. : ill.Thesis (Ph.D.) -- University of Adelaide, Dept.
Jenkins, Richard John Frank
core  

A rock brittleness index based on the postpeak energy release rate and damage surface characteristics for brittle hard rock

open access: yesDeep Underground Science and Engineering, EarlyView.
This study examines energy evolution in rock rupture via triaxial direct shear tests, exploring the impact of confining pressure and temperature on fracture surface randomness. A novel energy‐based brittleness index is proposed, validated experimentally, and compared with existing methods for reliability and accuracy.
Biao Wang   +5 more
wiley   +1 more source

INTERRELATIONS BETWEEN MALACHITE AND PSEUDOMALACHITE IN THE MEDNORUDYANSKOE DEPOSIT (CENTRAL URALS) [PDF]

open access: yesМинералогия, 2015
The examples of consecutive and alternated crystallization of malachite and pseudomalachite in zonal crusts, stalactites, and stalagmites of Mednorudyanskoe deposit are reviewed. Special attention paid to indicators of cocrystallization of these minerals
V.I. Popova, V.A. Popov, I.A. Blinov
doaj  

Silica: Physical Behavior, Geochemistry, and Materials Applications. Reviews in Mineralogy and Geochemistry Ser.

open access: yes, 2019
Reviews in Mineralogy & Geochemistry (RiMG) volumes contain concise advances in theoretical and/or applied mineralogy, crystallography, petrology, and geochemistry.Intro; Copyright; List of additional volumes of Reviews in Mineralogy; Foreword; Preface ...
Gibbs Gerald V.   +2 more
core  

Study on the composite fracture characteristics of filling and reinforcing cracked rock mass after high temperature damage

open access: yesDeep Underground Science and Engineering, EarlyView.
Cement infill shares compressive and shear stresses during loading, while interfacial friction hinders crack propagation and reduces stress concentration, improving the rock's load‐bearing capacity. Failure modes vary with crack inclination. Unfilled specimens show four modes.
Shihao Yuan   +4 more
wiley   +1 more source

SYNTAXY OF TITANITE, AEGIRINE AND ECKERMANNITE IN ALKALI SYENITE PEGMATITES OF THE VISHNEVYE MOUNTAINS (SOUTH URALS) [PDF]

open access: yesМинералогия, 2016
Crystallographic orientation of titanite intergrowths with aegirine and eckermannite was found in alkali syenite pegmatites of the Vishnevye Mountains: the titanite face ( 1 11) is parallel to pyroxene and amphibole face (010) and the titanite face (110)
V.A. Popov, I.A. Blinov, V.I. Popova
doaj  

Volatiles in Magmas Reviews in Mineralogy and Geochemistry Ser.

open access: yes, 2018
Reviews in Mineralogy & Geochemistry (RiMG) volumes contain concise advances in theoretical and/or applied mineralogy, crystallography, petrology, and geochemistry.Intro; Copyright; List of additional volumes of Reviews in Mineralogy; Foreword; Editors ...
Holloway John R., Carroll Michael R.
core  

Modeling and experimental validation of bolt–grout bond–slip behavior for deep underground excavation support

open access: yesDeep Underground Science and Engineering, EarlyView.
A novel shear‐lag model, validated by pull‐out tests, incorporates a constant bond stress stage to predict the complete load–displacement response of grouted rock bolts, providing a new tool for optimizing anchorage length and material toughness in deep underground engineering. Abstract The stability of rock masses in deep underground excavations, such
Wenhui Bian   +6 more
wiley   +1 more source

DELAFOSSITE FROM THE OXIDATION ZONES OF MASSIVE SULFIDE DEPOSITS OF THE URALS [PDF]

open access: yesМинералогия, 2016
The paper summarizes the data on the findings of delafossite in oxidation zones of the Urals ore deposits: Mednorudyanskoe, Uchaly, XIX Parts′yezda, Gay, and Bakr-Uzyak.
E.V. Belogub   +3 more
doaj  

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