Based on X-ray photoelectron spectroscopy, Gd5Ge 4(010) does not show evidence of surface segregation. Scanning tunneling microscopy reveals two types of terraces which alternate laterally on the surface. From the step heights, these two surface terminations are assigned as dense, Gd-pure layers in the bulk structure. There is evidence of reconstruction on one type of terrace.

Neuroscience in the News In recent years there has been an explosion of interest in the field of brain imaging. Within the past two decades, the number of published papers has risen from 3 per day in 1991 to 7 per day as of 2007 (Feb 11 Lecture: Picturing the Brain)! Despite numerous instrumental and methodological limitations in the use of fMRI (functional Magnetic Resonance Imagery) for funct...

When parallel applications are run in large-scale distributed environments, such as grids, peer-to-peer (P2P) systems, and clouds, the set of resources used can change dynamically as machines crash, reservations end, and new resources become available. It is vital for applications to respond to these changes. Therefore, it is necessary to keep track of the available resources—a problem which is...