Results 271 to 280 of about 6,179,886 (326)

Effect of chemical fractionation treatment on structure and characteristics of pyrolysis products of Xinjiang long flame coal

Fuel, 2018
The Xinjiang region is one of the most important energy bases in China. A demineralized coal treated by the chemical fractionation method will provide a promising approach to evaluate the inherent minerals catalytic performance in pyrolysis, especially ...
Hongyu Zhao, Binze Wang, Yuhuan Li, Q. Song, Yong-qiang Zhao, Ruiyang Zhang, Yang Hu, Shucheng Liu, Xiaohuan Wang, X. Shu   +9 more
semanticscholar   +1 more source

Chemical fractionations in meteorites—III. Major element fractionations in chondrites

Geochimica et Cosmochimica Acta, 1970
Abstract Some 20 elements, including the major constituents of chondritic matter, are fractionated among the several chondrite classes. We have tried to explain these fractionations on the assumption that they occurred in the solar nebula, starting from material of carbonaceous chondrite composition. 1. (1) Lithophile elements (Al, Ca, Cr, Hf, Mg,
J.W Larimer, Edward Anders
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Optimal control in chemical fractionation problem

Russian Mathematics, 2012
We study a chemical fractionation process in a tower. This process is described by a system of first-order partial differential equations. We obtain necessary optimality conditions for the optimal control problem in a class of smooth boundary controls with pointwise restrictions and perform numerical tests.
A. V. Arguchintsev, V. P. Poplevko
openaire   +1 more source

Simple ICP-OES based method for determination of selected elements in brewed ground and soluble coffees prior to evaluation of their intake and chemical fractionation.

Food Chemistry, 2018
A simple method of simultaneous determination of aluminum (Al), barium (Ba), calcium (Ca), copper (Cu), iron (Fe), magnesium (Mg), manganese (Mn), nickel (Ni), strontium (Sr) and zinc (Zn) in brews of ground and soluble coffees was proposed. It relied on
P. Pohl, Anna Szymczycha-Madeja, M. Wełna   +2 more
semanticscholar   +1 more source

Chemical fractionations in meteorites—X. Ureilites

Geochimica et Cosmochimica Acta, 1976
An investigation involving the measurement of 17 trace elements in 4 ureilites was conducted with the objective to obtain information for the characterization of the two components of the ureilites. The groundmass of the mineral is an olivine-clinopyroxene rock which is presumably the residue left after partial melting of a more primitive precursor ...
Hideo Higuchi, John W Morgan, R Ganapathy, Edward Anders   +3 more
openaire   +1 more source

Chemical Fractionation at Environmental Interfaces

2010
Chemical processes at the interfaces often differ kinetically and mechanistically from the bulk counterparts, partly due to the concentration inhomogeneity of different chemicals at the interfaces. The fractionation of chemicals at the interfaces not only determines their interfacial concentrations, but also affects the physicochemical properties of ...
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Citrus Flavonoid Complex: Chemical Fractionation and Biological Activity

Science, 1963
A study was made of the anti-inflammatory activity of the fractionated components of a citrus flavonoid complex. Several highly active components, distinct from hesperidin and naringin, were isolated and tested for anti-inflammatory activity. A method for evaluation of this biological activity is recommended.
L, FREEDMAN, A J, MERRITT
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Partial Purification of Aflatoxins by Simple Chemical Fractionation

Zentralblatt für Bakteriologie, Parasitenkunde, Infektionskrankheiten und Hygiene. Zweite Naturwissenschaftliche Abteilung: Allgemeine, Landwirtschaftliche und Technische Mikrobiologie, 1974
Summary A simple chemical fractionation procedure for the partial purification of aflatoxins, produced by a locally isolated Aspergillus flavus strain, was carried out. According to this procedure it was possible to isolate aflatoxin B free from other interfering compounds. Rf values, U.V.
M S, Tewfik, M, el-Khadem, Y A, Hamdi
openaire   +2 more sources

Correlation between chemical fractionation of heavy metals and their toxicity in the contaminated soils

Environmental Earth Sciences, 2021
F. Akbarpour, S. Gitipour, M. Baghdadi, N. Mehrdadi   +3 more
semanticscholar   +1 more source

Chemical fractionation in the solar system

Journal of Radioanalytical Chemistry, 1977
The cosmochemical and geochemical history of planetary material is reflected in relative and absolute abundances of two groups of trace elements; siderophiles and volatiles. Many of these elements can be determined at the requires levels only by radiochemical neutron activation analysis.
openaire   +1 more source