Results 61 to 70 of about 174,368 (349)
Journal of Economic Geology, 2023 Shotorsang iron skarn is located in 60 km northwest of Neyshabour (Khorasan Razavi, Iran) in Quchan-Sabzevar magmatic belt. Subvolcanic intrusion rocks have intruded into Cretaceous limestones and created skarnization.
Seyed Ahmad Mazaheri , Mojtaba Heydari
doaj +1 more source
Rocky Mountain Journal of Mathematics, 1994 This paper deals with the question when the Rees ring associated with a filtration of ideals is invariant under a given derivation. Necessary and sufficient conditions are presented in the general case. The above question is also considered for several specific filtrations.
TAMONE, GRAZIA, MOLINELLI SILVIA
openaire +4 more sources
Environmental Science and Technology, 2019 In recent years, recovery of rare earth elements (REEs) from coal fly ashes (CFAs) has been considered as a promising resource recovery option. Yet, quantitative information on REE speciation in CFAs and its correlation with REE extractability are not ...
Pan Liu, Rixiang Huang, Yuanzhi Tang
semanticscholar +1 more source
EnvironmentsThe rare earth elements (REE) comprise a group of 16 chemically very similar elements that occur widespread in rocks, soils, and water bodies, share similar ionic radii to the essential element Ca2+, and consequently also occur in biota.
Manfred Sager, O. Wiche
semanticscholar +1 more source
, 2023 Some of the world’s largest REE deposits were formed via secondary hydrothermal fluid enrichment. REE-bearing minerals of economic interest precipitate in these environments from the interactions of the hydrothermal fluid and the surrounding wall-rock ...
Price, Dylan Lloyd
core +3 more sources
Journal of Economic Geology, 2012 Qahr-abad fluorite deposit is located 58 km southeast of Saqqez, in northwestern Kordestan province and in northern end of Sanandaj-Sirjan Zone. The factors such as change in physicochemical conditions of mineralization environment (pH and Eh), variation
Babak Talaei, Ali Abedini
doaj +1 more source
Determination of the Content of the Rare Earth Elements (REE) in Akashat Phosphate rocks (Paliocene) in [PDF]
Kirkuk Journal of Science, 2009 The X-ray fluorescence technique meets the requirements of qualitative and quantitative analysis of widely variable major, minor and trace elements including rare earth elements (REE) in geological samples.
Kotayba T. Al-Youzbakey +1 more
doaj +1 more source
Opinion dynamics of random-walking agents on a lattice [PDF]
, 2011 The opinion dynamics of random-walking agents on finite two-dimensional lattices is studied. In the model, the opinion is continuous, and both the lattice and the opinion can be either periodic or nonperiodic.
Suhan Ree, Ree, Suhan
core +1 more source
Roczniki Panstwowego Zakladu HigienyThe accelerating global use of lanthanides in modern consumer goods has introduced a new source of environmental pollution and potential health hazards.
Jerzy Falandysz +3 more
doaj +1 more source
Prospects for identifying the Mississippi Valley type deposits in the North-East of Russia
Литосфера, 2020 Research subject. The Mississippi Valley type deposits make up about a third of the global balance of lead and zinc reserves, resources and production.
A. L. Galyamov +4 more
doaj +1 more source