In this study we present an initial dataset of Mn/Ca and Fe/Ca ratios in tests of benthic foraminifera from the Peruvian oxygen minimum zone (OMZ) determined with SIMS. These results are a contribution to a better understanding of the proxy potential of these elemental ratios for ambient redox conditions. Foraminiferal tests are often contaminated by diagenetic coatings, like Mn rich carbonateo...

The nanocrystallization processes in Fe-Si-B-Nb-Cu and Fe-Nd-B(-Cu-Nb) amorphous alloys have been studied by transmission electron microscopy (TEM) and a three dimensional atom probe (3DAP). Cu additions are effective in refining the nanocrystalline microstructures of an Fe74.5Si13.5B8Nb3Cu1 alloy and an Fe3B/Nd2Fe14B nanocomposite microstructure. This is because Cu atoms form a high density of...

Two new insoluble transition metal substituted phosphotungstates, (C2N2H10)11[{(B-alpha-PW9O34)Fe3(OH)3}4(PO4)4Fe].38H2O(1) and K4(C2N2H10)12[(alpha-PW10Fe2O39)4].30H2O(2), have been isolated by the hydrothermal reaction of [A-alpha-PW9O34]9-, Fe(III) ions and ethylenediamine. Compound 1 has a tetrahedral symmetry and contains a Fe13 core built from the assembly of four Fe(III) trisubstituted [...

– The electronic structure of the monoclinic structure of Fe3O4 is studied using both the local density approximation (LDA) and the LDA+U . The LDA gives only a small charge disproportionation, thus excluding that the structural distortion should be sufficient to give a charge order. The LDA+U results in a charge disproportion along the c-axis in good agreement with the experiment. We also show...

The synthesis, spectroscopic and structural characterization of the aryloxy and amino functionalized chloroboryl complexes (eta(5)-C(5)R(5))Fe(CO)(2)B(OMes)Cl (R = H, 2a ; R = Me, 3a) and (eta(5)-C(5)H(5))Fe(CO)(2)B(N(i)Pr(2))Cl (7a) are reported. Compound 2ais shown to be a versatile substrate for further boron-centred substitution chemistry leading to the asymmetric boryl complexes (eta(5)-C(...

We present a detailed chemical abundance analysis of the young massive cluster (YMC) NGC 1569-B. The host galaxy, NGC~1569, is dwarf irregular starburst galaxy at distance 3.36$\pm$0.20 Mpc. determined ratios from an optical integrated-light spectrum 1569-B, obtained with HIRES echelle spectrograph on Keck I telescope. considered different red-to-blue supergiant ratios, namely: ratio theoretica...

Amorphous thin films of transition metal (TM)-metalloid and TM-rare earth (R) alloys have been prepared by sputtering and multiple-target, electron-beam vapor deposition. Application of these has been made in several technically important areas including continuously variable surface acoustic wave (SAW) delay lines or resonators and magneto-optic mirrors for biasing ringlaser-gyroscopes (RLG). ...

in order to evaluate the effects of foliar micronutrients on quantitative and qualitative yield of safflower (carthamus tinctorius l.), a field experiment was carried out at research farm of agricultural faculty, zabol university during growing season of 2005-2006. the experiment performed based on rcbd with 3 replications and 7 treatments including: fe, zn, b, pair combination of them and cont...