Results 51 to 60 of about 51,712 (271)
Trace element analysis of sound and decayed Norway spruce (Picea abies) by XRF and NAA methods.
Silva Fennica, 1979 Ashed tree samples from sound and decayed Norway spruce ( (L.) H. Karst.) were studied by means of fast neutron activation analysis, and for comparison, also by X-ray fluorescence analysis. In fast neutron activation analysis, the following elements were
Raunemaa, T. +5 more
doaj +1 more source
Application of XRF Scanning to Different Geological Archives
Earth and Space Science, 2021 High‐resolution XRF scanning is widely used on marine and lake sediment cores as a means of rapidly acquiring elemental concentrations from closely spaced intervals with no damage to the samples. Therefore, guidance on how to obtain reliable datasets and
Fei Guo +8 more
doaj +1 more source
Rb-Sr, Sm-Nd ages of the Phalaborwa Carbonatite Complex, South Africa [PDF]
, 2005 We analyzed Rb-Sr and Sm-Nd isotopic compositions of whole-rock and minerals from syenite, biotite gneiss xenolith, dolerite dyke, phoscorite, and carbonatite from the Phalaborwa Carbonatite Complex located in northeastern Transvaal, South Africa ...
Hiroo Kagami +3 more
core +1 more source
Latin American Journal of Sedimentology and Basin Analysis, 2006 In this work, the Rb-Sr and Sm-Nd methods were applied to fine-grained sedimentary rock samples of the Santa Maria Formation (Triassic, Paraná Basin) in order to have provenance informations.
Diogo Rodrigues Andrade Da Silva +4 more
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Study of the mineralization potential of the intrusives around Valis (Tarom-Iran)
Earth Sciences Research Journal, 2014 The study area is located in northwestern Iran in the central Iran zone, specifically the western Alborz sub-zone south of the Tarom-Hashtjin metallogenic zone.
Mojtaba Bahajroy, Saeed Taki
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Sm-Nd isotopic systematics of lherzolitic shergottite Yamato-793605 [PDF]
, 2006 We have undertaken Sm-Nd isotopic studies on Yamato-793605 lherzolitic shergottite. The Sm-Nd internal isochron obtained for acid leachates and residues of whole-rock and separated mineral fractions yields an age of 185±16Ma with an initial εNd value of +
Katsuyuki Yamashita +5 more
core +1 more source
Analysis &Sensing, EarlyView.Electrospray ionization mass spectrometry (ESI‐MS) combined with thermodynamic modeling provides the first direct characterization of radium speciation in synthetic gastrointestinal biofluids. Free Ra2+ ions predominate with minimal protein binding and negligible EDTA complexation. Crown ethers enable effective Ra complexation.
Linus Holtmann +5 more
wiley +1 more source
Concordant ages for the giant Kipushi base metal deposit (DR Congo) from direct Rb-Sr and Re-Os dating of sulfides [PDF]
, 2018 We report concordant ages of 451.1 ± 6.0 and 450.5 ± 3.4Ma from direct Rb-Sr and Re-Os isochron dating, respectively, of ore-stage Zn-Cu-Ge sulfides, including sphalerite for the giant carbonate-hosted Kipushi base metal (+Ge) deposit in the ...
Brauns, Michael +2 more
core
Asia-Pacific Journal of Chemical Engineering, EarlyView.ABSTRACT The paper establishes an advanced computing algorithm to investigate the thermosolutal dynamics of an electrically conductive Brinkman‐type nanofluid that moves in a porous channel, and the fluid is acted on by an inclined magnetic field exerted externally.
Urwa Shehbaz +4 more
wiley +1 more source
Trace elements in some Finnish pegmatitic potassium feldspars [PDF]
Bulletin of the Geological Society of Finland, 1968 Thirty eight potassium feldspar samples from pegmatites were analyzed for K, Na, Ca, Fe, Rb, Sr, Cs, Ba and Pb. The X-ray fluorescence method used and the distribution of the trace elements are described and discussed.
R. Lappalainen, K.J. Neuvonen
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