We present the results from a Hubble Space Telescope/ACS study of the supernovae associated with gamma-ray bursts 040924 (z = 0.86) and 041006 (z = 0.71). We find evidence that both GRBs were associated with a SN1998bw-like supernova dimmed by ∼ 1.5 and ∼ 0.3 magnitudes, respectively, making GRB040924 the faintest GRB-associated SN ever detected. We study the luminosity dispersion in GRB/XRF-as...

Several techniques have been utilized for the preparation of hydroxyapatite (HA) and other calcium phosphates for the development of biomaterials. It is vital to know the reaction kinetics to be able to control the material obtained by the aqueous solution route. In the present work, HA has been produced by different wet precipitation processes and different experimental conditions. Calcium hyd...

An important parameter for the distinction of X-ray flashes, X-ray rich bursts and Gamma-ray bursts in the rest frame is the distance to the explosion site. Here we report on the spectroscopic redshift determination of the host galaxy of XRF/GRB 030528 using the ESO VLT FORS2 instrument. From the strong oxygen and hydrogen emission lines the redshift was measured to be z=0.782±0.001. Obtaining ...

The technique of (109)Cd-based X-ray fluorescence (XRF) measurements of lead in bone is well established. A paper by some XRF researchers [Gordon CL, et al. The Reproducibility of (109)Cd-based X-ray Fluorescence Measurements of Bone Lead. Environ Health Perspect 102:690-694 (1994)] presented the currently practiced method for calculating the variance of an in vivo measurement once a calibratio...

Among the possible variants of X-Ray Fluorescence (XRF), applications exploiting scanning Macro-XRF (MA-XRF) are lately widespread as they allow visualization element distribution maintaining a non-destructive approach. The surface is scanned with focused or collimated X-ray beam millimeters less: analyzing emitted fluorescence radiation, also elements present below contribute to elemental imag...

Following QA/QC procedures, portable XRF (p-XRF) field tests were performed on borehole samples from nickel laterite deposits and the results compared with lab-XRF results. To verify reliability accuracy of obtained by p-XRF in field, certified reference materials prepared as glass beads analyzed together samples. The showed that overall contents each element generally lower wet than pulp sampl...

this study is aimed to identify sources of particulate matter with mean aerodynamic diameterbelow 10 μm (pm10) present in the atmosphere of the metropolitan area of mexico city (mamc), usingsamples obtained from january 1st to june 30th, 2009, analyzed with x-ray spectrometric techniques.minivol samplers were used to collect samples on polycarbonate filters in three sites (north, center, andsou...