Results 61 to 70 of about 32,962 (258)
, 2011 Systematic variations in 54Cr/52Cr ratios between meteorite classes (Qin et al., 2010a; Trinquier et al., 2007) point to large scale spatial and/or temporal isotopic heterogeneity in the solar protoplanetary disk.
Alexander +76 more
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Influence of OH- concentration on the illitization of kaolinite at high pressure [PDF]
, 2011 The products of hydrothermal reactions of kaolinite at 300°C and 1000 bars were studied in KOH solutions covering an OH- concentration, [OH-], of 1M to 3.5M. XRD patterns indicated a notable influence of the [OH-] on the reaction.
Becerro Nieto, Ana Isabel +2 more
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Characterization of Ancient Mortars from Minoan City of Kommos in Crete
Heritage, 2021 This work characterizes ancient mortars used in construction of the Bronze Age Minoan port at Kommos in Crete. The port dates from c. 1850 BCE with port facilities at the harbor and residences on the Central hillside and the Hilltop. A Greek, Phoenician,
Pagona-Noni Maravelaki +5 more
doaj +1 more source
Evolution of oxygen isotopic composition in the inner solar nebula
, 2005 Changes in the chemical and isotopic composition of the solar nebula with time are reflected in the properties of different constituents that are preserved in chondritic meteorites. CR carbonaceous chondrites are among the most primitive of all chondrite
Aleon J. +30 more
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Viscosities of melts in the Na2O---FeO---Fe2O3---SiO2 system and factors controlling relative viscosities of fully polymerized silicate melts [PDF]
, 1988 Na2O---B2O3---SiO2 and Na2O-Ga2O3 viscosities decrease in the order aluminosilicate > ferrosilicate, (galliosilicate ?) > borosilicate. Thp electronegativities of the trivalent cations are inversely correlated with the relative viscosities of melts in ...
Dingwell, Donald B., Virgo, David
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HYDROTHERMAL SYNTHESIS AND CHARACTERIZATION OF VANADIUM SILICATE MOLECULAR SIEVES WITH ANALCIME, MAGEDIITE AND ZSM-11 STRUCTURE [PDF]
Journal of Sciences, Islamic Republic of Iran, 2002 Vanadium silicates such as V-Al-analcime, V-analcime, V-magediite and V-ZSM-11 were synthesized using vanadium pentoxide or vanadyl sulfates. Vanadium silicates with analcime structure with and without aluminum (V-Al-analcime, V-analcime) were prepared ...
doaj
Известия Томского политехнического университета: Инжиниринг георесурсов, 2019 The relevance. Ground sources of drinking water supply in the West Siberian region are characterized by high content of iron ions, silicate ions and organic substances of humus origin. These impurities lead to formation of a stable colloidal system. When
Larisa A. Kostikova +3 more
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Removal of chromium from Enugu coal using HCl as leaching agent
Journal of Applied Sciences and Environmental Management, 2018 This study investigated the removal of chromium from Enugu Coal with HCL as the leaching agent under different conditions such as Leaching Time, particle size, acid concentration, and volume of leaching agent.
S.E. Okoro, N.L. Eneh, C.O. Asadu
doaj +1 more source
The mid-infrared diameter of W Hydrae
, 2011 Mid-infrared (8-13 microns) interferometric data of W Hya were obtained with MIDI/VLTI between April 2007 and September 2009, covering nearly three pulsation cycles. The spectrally dispersed visibility data of all 75 observations were analyzed by fitting
A. Quirrenbach +85 more
core +1 more source
Chemical diffusion of fluorine in jadeite melt at high pressure [PDF]
, 1984 The chemical diffusion of fluorine in jadeite melt has been investigated from 10 to 15 kbars and 1200 to 1400°C using diffusion couples of Jadeite melt and fluorine-bearing jadeite melt (6.3 wt.% F). The diffusion profile data indicate that the diffusion
Dingwell, Donald B. +1 more
core +1 more source