We present ESO/VLT FORS2 low resolution spectroscopy of red giant branch stars in three massive, intermediate age ($\sim 1.7-2.3$ Gyr) star clusters the Large Magellanic Cloud. measure CH and CN index bands at 4300A, 3883A, as well [C/Fe] [N/Fe] abundance ratios for 24, 21 12 member NGC 1978, 1651, 1783, respectively. find a significant intrinsic spread 1978 signal multiple stellar populations ...

in this research, structural and electronic properties of zncdn-1ten clusters (n=1-10) have been studied by formalism of density functional theory and using the projector augmented wave within local density approximation. the structural properties (such as bond length/angle and coordination number), electronic and optical properties (such as binding energy, kohn-sham spectrum and partial charge...

abstract improving nitrogen use efficiency (nue) is an important objective of the agroecosystem management. a field experiment was conducted to study the effect of different competition patterns on nitrogen balance in the wheat agroecosystem. experimental design was split–plot based on randomized complete blocks with four replications. the main plots consisted of different nitrogen rates (i.e. ...

This paper examines a carbon layer on blood vessel implant. The is created by high energy ions bombarding an inner surface of the polyurethane An analysis molecular structure was carried out, demonstrating appearance free radicals stabilized aromatic clusters, as well new carbon-carbon, oxygen-containing and nitrogen-containing groups in covalent adsorption protein inside implant has been prove...

The active sites of monodisperse transition metal Ni-clusters were anchored on carbon nitride (CN) by an in situ photoreduction deposition method to promote the efficient separation photogenerated charges and achieve high-efficiency photocatalytic activity for hydrogen evolution. Ni-cluster/CN exhibited a production rate 16.5 mmol·h–1·g–1 total turnover frequency (TOF (H2)) value 461.14 h–1. X-...

OBJECTIVES There are a few accepted and intensively applied statistical methods used to study associations of ambient air pollution with health conditions. Among the most popular methods applied to assess short term air health effects are case-crossover (using events) and time-series methodologies (using counts). A few other techniques for studying counts of events have been proposed, including...

We report the discovery of a hitherto undetected population of Wolf-Rayet stars in the young galactic open cluster Westerlund 1. Optical spectroscopy of the cluster identified 11 such objects; provisional classification suggests that 6 are nitrogen rich (WN) and 5 carbon rich (WC). Including the previously identified Blue, Yellow & Red Super& Hypergiants, Westerlund 1 clearly has a very rich po...