Results 51 to 60 of about 614 (173)

Mineralogy, mineral chemistry, and redox equilibria in ten aggregate particles from asteroid Bennu

Meteoritics &Planetary Science, Volume 61, Issue 8, Page 1905-1927, August 2026.
Abstract Examination of 10 Bennu aggregate particles has revealed the presence of many phases which taken together can provide constraints on the oxygen fugacity (fO2) of Bennu samples. Phyllosilicates (saponite and serpentine), carbonates, oxides (magnetite, chromite), sulfides (pyrrhotite, pentlandite), phosphate (hydroxyapatite, Na‐Mg‐phosphate ...
K. Righter, J. Gorce, L. Le, K. Thomas‐Keprta, Z.E. Wilbur, L.P. Keller, Z. Gainsforth, T.J. McCoy, T.J. Zega, S.S. Russell, H.C. Connolly Jr., D.S. Lauretta   +11 more
wiley   +1 more source

Iodimetry method of endogenous deposits search

RUDN Journal of Engineering Research, 2013
The article deals with the theoretical background for the application of iodometry search of endogenous deposits, particularly the behavior of iodine above the ore bodies.
V V Diakonov, A E Kotelnikov, V E Markov, E E Kotelnikov, N A Gorg   +4 more
doaj  

Potassium isotopic compositions and exposure ages of evolved and silica‐rich achondrites

Meteoritics &Planetary Science, Volume 61, Issue 8, Page 2140-2162, August 2026.
Abstract Some of the oldest igneous rocks in the Solar System include evolved and silica‐rich achondrites that originate from parent bodies less than 1000 km in diameter, referred to as planetesimals. While Earth was initially in a molten state and required continental crust formation and plate tectonics to generate andesite bulk compositions, evolved ...
Z. Vaci, Z. Tian, P. Koefoed, M. Habermann, M. Humayun, K. Ziegler, H. Busemann, D. Krietsch, J. M. D. Day, K. Wang   +9 more
wiley   +1 more source

Natural Resources and Political Patronage in Africa: An Ethnicity Level Analysis

Review of Development Economics, Volume 30, Issue 3, Page 1957-1972, August 2026.
ABSTRACT We investigate the effect of resource discoveries on ethnicity‐level political patronage in Africa using a large geospatial dataset of 254 ethnic groups in 15 countries over the period 1960–2004. We find that the first (or single first) resource discovery in a virgin ethnic homeland increases the share of cabinet posts of that ethnicity.
Sambit Bhattacharyya, Nemera Mamo
wiley   +1 more source

Assessing gold-bearing potential of the Kvarhush area (Western slope of the Urals, Perm krai) [PDF]

Минералогия
The paper examines the morphology and composition of native gold from placers of the Kvarkush region (Perm krai). Using optical and electron microscopy, 149 native gold grains from three placers are studied.
M.D. Shamsutdinov, S.V. Petrov
doaj   +1 more source

Experimental Phase Equilibria Study and Thermodynamic Modeling of the Na2O–SnO–SnO2–SiO2 System

Journal of the American Ceramic Society, Volume 109, Issue 7, July 2026.
ABSTRACT Integrated experimental and thermodynamic modeling study of the phase equilibria in the Na2O–SnO–SnO2–SiO2 system in air and in equilibrium with liquid metal has been undertaken for characterizing the thermochemistry of slag in smelting side streams enriched in Sn and optimizing the fuming process. New experimental phase equilibria data at 800°
Hamed Abdeyazdan, Maksym Shevchenko, Evgueni Jak   +2 more
wiley   +1 more source

Production of fatty alcohol from palm oil methyl ester [PDF]

Songklanakarin Journal of Science and Technology (SJST), 2007
Fatty alcohol is an important raw material for the production of surfactants, and is currently in demand by markets and has a high potential for growth. Moreover, fatty alcohol can be made from methylester that is produced from fats and natural oil.
Tongurai, C., Sahutsarungsi, S., Bunyakan, C   +2 more
doaj  

Evaluation of Ophiolite Complex Impact and Pollution Indices of Groundwater Resources in Jovein Area (NE Iran) [PDF]

Journal of Advances in Environmental Health Research
Background: Potential ore deposits and mining activities can cause soil and groundwater pollution with heavy metals, posing risks to human health. This study aimed to identify heavy metal sources, their transfer patterns, and contamination levels in the ...
Raheleh Hatefi, Morteza Razmara Farzaghi, Seyed Mohammad Zamanzadeh   +2 more
doaj   +1 more source

Recent progress in selective liquid-phase hydrogenation of furfural on heterogeneous Ni-containing catalysts

Green Synthesis and Catalysis
Lignocellulose biomass, without any doubts, is one of the most promising, and, therefore, one of the most studied sources for the production of biofuels, valuable chemicals and “green” solvents. Furfural – a product of biomass catalytic conversion – is a
Victoria S. Zhuravleva, Anastasiya A. Shesterkina, Anna A. Strekalova, Kseniia V. Vikanova, Alexander L. Kustov   +4 more
doaj   +1 more source

Extraction of platinum metals during procssing of chromium ores from dunnite deposits

Записки Горного института, 2018
Currently, the main raw materials sources of platinum group metals in Russia are complex sulfide copper-nickel ores of the Taimyr region and placer deposits.
G. V. Petrov, Ya. M. Shneerson, Yu. V. Andreev   +2 more
doaj   +1 more source