As multi-core chips become ubiquitous, it is critical to develop parallel programming models and runtime systems that can harness their computational capabilities. In this paper, we evaluate the suitability of the MapReduce model for multi-core and multi-processor systems. MapReduce was developed by Google to program and manage data-centers with thousands of servers. It allows programmers to wr...

We present the results of a VLT observing program carried out in service mode using FORS1 on ANTU in Long Slit mode to determine the optical velocities of nearby low surface brightness galaxies. As part of our program of service observations we obtained long-slit spectra of several members of the Phoenix dwarf galaxy from which we derive an optical helio-centric radial velocity of −13 ± 9 km/s....

this study was carried out to investigate the morphological and anatomical aspects of somatic embryogenesis in date palm. lateral bud and shoot tip explants excised from young offshoots were cultured on ms medium with 2,4-d. somatic embryogenesis was in-duced by transferring the calli produced on the same medium without hormones. micro-tome sectioning of paraffin-embedded specimens was carried ...

[1] We analyze Surface Stereo Imager observations of rocks, sediments, and permafrost-related landforms in the vicinity of the Phoenix lander, comparing the imaged features to analogous examples of physical weathering and periglacial processes observed in the Antarctic Dry Valleys. Observations at the Phoenix landing site of pitted rocks, ‘‘puzzle rocks’’ undergoing in-situ breakdown, perched c...