Results 91 to 100 of about 9,629,822 (348)

Effect of confining pressure on fracture characteristics and mineralogical behavior of tight sandstone specimens after hydraulic fracturing

Deep Underground Science and Engineering, EarlyView.
Hydraulic fracturing in tight sandstone and fracture propagation characteristics using backscattered electron‐scanning electron microscope (BSE‐SEM) images. Abstract This study focuses on hydraulic fracturing experiments conducted under triaxial conditions on tight sandstone specimens from Shivpuri district, Madhya Pradesh, India.
Pankaj Rawat, Narendra Kumar Samadhiya
wiley   +1 more source

Thermal Decomposition of the Murchison CM2 Carbonaceous Chondrite: Implications of Space Weathering Processes for Sample Return Missions [PDF]

Primitive carbonaceous asteroids are the target bodies for the JAXA Hayabusa2 mission to Ryugu and the NASA OSIRIS-REx mission to Bennu. Both asteroids share spectral characteristics of CI/CM type carbonaceous chondrites. Ryugu, in particular, appears to
Han, J., Keller, L. P., Lee, S., Morris, R. V., Rahman, Z.   +4 more
core   +1 more source

Biological niches within human calcified aortic valves. Towards understanding of the pathological biomineralization process [PDF]

, 2015
Despite recent advances, mineralization site, its microarchitecture, and composition in calcific heart valve remain poorly understood. A multiscale investigation, using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and ...
Cavarretta, Elena, Cottignoli, Valentina, Familiari, Giuseppe, Giovanna, Agrosì, Loris, Salvador, Maras, Adriana, Relucenti, Michela   +6 more
core   +3 more sources

Mineralogical characteristics and treatment of refractory gold ores

Minerals Engineering, 1989
Abstract Refractory gold ores and concentrates are characterised by low gold recoveries and high cyanide consumptions when subjected to direct cyanide leaching. Therefore an oxidation pretreatment step is required before cyanidation that will break up the sulphide lattice and render gold particles accessible to cyanide ions.
Κομνιτσας Κωνσταντινος(http://users.isc.tuc.gr/~kkomnitsas), Komnitsas Konstantinos(http://users.isc.tuc.gr/~kkomnitsas), Pooley F.D.()   +2 more
openaire   +2 more sources

Lithium-Rich Claystone in the McDermitt Caldera, Nevada, USA: Geologic, Mineralogical, and Geochemical Characteristics and Possible Origin

, 2020
Lithium deposits in tuffaceous sediments of the McDermitt caldera constitute possibly the world’s largest Li clay resource, yet their characteristics and origin are not established.
S. B. Castor, C. Henry
semanticscholar   +1 more source

Optimization of cut‐hole layout under high in situ stress based on numerical simulation and field tests

Deep Underground Science and Engineering, EarlyView.
This study investigates the blast‐induced rock damage patterns under different cut‐hole layouts and ground stress conditions through numerical simulations and field tests. The findings in this study provide valuable insights for similar underground engineering applications.
Junjie Zhao, Diyuan Li, P. G. Ranjith, Xinxin Lü, Yanliang Li, Xiaoli Su   +5 more
wiley   +1 more source

Characterization of surficial units on Mars using Viking orbiter multispectral image and thermal data [PDF]

Albedo and thermal property correlations of the topography of Mars were conducted with emphases upon the types and origins of materials exposed in the central equatorial region. This area displays a wide variation in color, albedo and thermal properties,
Arvidson, R. E., Christensen, P. R., Presley, M. A.   +2 more
core   +1 more source

Weathering microenvironments on feldspar surfaces: implications for understanding fluid-mineral reactions in soils [PDF]

, 2008
The mechanisms by which coatings develop on weathered grain surfaces, and their potential impact on rates of fluid-mineral interaction, have been investigated by examining feldspars from a 1.1 ky old soil in the Glen Feshie chronosequence, Scottish ...
Blum, C. L. Smith, D. J. Brown, M. E. Hodson, M. Mackenzie, M. R. Lee, Smith, Velbel, Zhu   +8 more
core   +2 more sources

Mineralogy Characteristics of Sedimentary Bauxite in Western Guangxi

Yankuang ceshi, 2023
BACKGROUNDChina is the world’s largest aluminum producer and consumer. With the development of China’s aluminum industry, bauxite resources are consumed continuously and highly dependent on imports. In 2019, China’s imports exceeded 100 million tons of bauxite, with an increase of 21.9%, and in 2020, imports reached a record high of 110 million tons ...
Lianjun WEI, Yanqing CHEN, Manqi LEI, Qingqi HUANG   +3 more
openaire   +1 more source

Mineralogical and chemical characteristics of some natural jarosites

Geochimica et Cosmochimica Acta, 2010
Abstract This paper presents a detailed study of the mineralogical, microscopic, thermal, and spectral characteristics of jarosite and natrojarosite minerals. Systematic mineralogic and chemical examination of a suite of 32 natural stoichiometric jarosite and natrojarosite samples from diverse supergene and hydrothermal environments indicates that ...
Desborough, George A., Smith, Kathleen S., Lowers, Heather A., Swayze, Gregg A., Hammarstrom, Jane M., Diehl, Sharon F., Leinz, Reinhard W., Driscoll, Rhonda L.   +7 more
openaire   +2 more sources