The relative stability of Al11Sm3 (Al4Sm) intermetallic phases was experimentally investigated through a series of heat treatments followed by microstructural, microchemical, and X-ray diffraction (XRD) analyses. The principal findings are that the high-temperature tetragonal phase is stable from 1655 to 1333 K and that the low-temperature orthorhombic phases, α and γ, have no range of full sta...

Ji-yi Zhang 1, Peng-cheng Yin 2, Gang Li 1,*, He-he Gu 1, Hua Zhao 1 and Jian-chun Fu 1 1 School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221008, China; [email protected] (J.-Y.Z.); [email protected] (H.-H.G.); [email protected] (H.Z.); [email protected] (J.-C.F.) 2 Bureau of Land and Resources of Xuzhou, Xuzhou 221006, China; [email protected] * C...

Ice condensation on sulfuric acid tetrahydrate: implications for polar stratospheric ice clouds T. J. Fortin , K. Drdla, L. T. Iraci, and M. A. Tolbert Department of Chemistry and Biochemistry and Cooperative Institute for Research in Environmental Sciences, University of Colorado, CIRES Building Room 318, Boulder, CO 80309-0216, USA NASA Ames Research Center, Earth Science Division, Moffett Fi...

OBJECTIVE In this commentary I respond to points raised in the commentary by Mushak [Ad hoc and fast forward: the science and control of hormesis growth and development. Environ Health Perspect 117:1333-1338 (2009)], which principally concerns studies by me and my colleagues concerning the frequency of hormesis in toxicology. DISCUSSION In this commentary I demonstrate that Mushak's analysis ...

We report high-angular-resolution measurements of polarized dust emission toward the low-mass protostellar system NGC 1333 IRAS 4A. We show that in this system the observed magnetic field morphology is in agreement with the standard theoretical models of the formation of Sun-like stars in magnetized molecular clouds at scales of a few hundred astronomical units; gravity has overcome magnetic su...

Long-slit 8-13 micrometers spectroscopy of the nebula around NGC 1333 SVS 3 reveals spatial variations in the strength and shape of emission features that are probably produced by polycyclic aromatic hydrocarbons (PAHs). Close to SVS 3, the 11.2 micrometers feature develops an excess at approximately 10.8-11.0 micrometers and a feature appears at approximately 10 micrometers. These features dis...