A total of 235 Active Galactic Nuclei (AGN) from two different soft X-ray surveys (the ROSAT Deep Survey –DRS– and the ROSAT International X-ray Optical Survey –RIXOS–) with redshifts between 0 and 3.5 are used to study the clustering of Xray selected AGN and its evolution. A 2 sigma significant detection of clustering of such objects is found on scales < 40 − 80 h Mpc in the RIXOS sample, whil...

In a typical distributed storage system, metadata is stored and managed by dedicated metadata servers. One way to improve the availability of distributed storage systems is to deploy multiple metadata servers. Past research focused on the active/standby model, where each active server has at least one redundant idle backup. However, interruption of service and loss of service state may occur du...

We review the current status of QSO clustering measurements, particular with respect to their relevance in understanding AGN physics. Measurements based on the 2dF QSO Redshift Survey (2QZ) find a scale length for QSO clustering of s0 = 5.76 +0.17 −0.27 h Mpc at a redshift z̄ ≃ 1.5, very similar to low redshift galaxies. There is no evidence of evolution in the clustering of QSOs from z ∼ 0.5 to...

Consensus clustering methods are motivated by the success of combining multiple classifiers in many areas. In this paper, graph-based consensus clustering is used to improve the quality of chemical compound clustering by enhancing the robustness, novelty, consistency and stability of individual clusterings. For this purpose, HyperGraph Partitioning Algorithm (HGPA) [1], was applied. The cluster...

We present the first galaxy evolution results from the Local Cluster Substructure Survey (LoCuSS), a multiwavelength survey of 100 X-ray selected galaxy clusters at 0.15 ≤ z ≤ 0.3. LoCuSS combines far-ultraviolet (UV) through far-infrared (IR) observations of cluster galaxies with gravitational lensing analysis and X-ray data to investigate the interplay between the hierarchical assembly of clu...

Repeated head trauma experienced by active professional fighters results in various structural, functional and perfusion damage. However, whether there are common regions of structural and perfusion damage due to fighting and whether these structural and perfusion differences are associated with neuropsychological measurements in active professional fighters is still unknown. To that end, T1-we...

| GAMMA (Genoa Active Message Machine) is a high performance communication layer implemented at kernel level as an extension of the Linux operating system. It is based on Active Ports, a communication mechanism derived from Active Messages. On low-cost clusters of Personal Computers (PCs) connected by Fast Ethernet, GAMMA achieves much better communication performance compared to MPI and PVM. W...

The CO dehydrogenase of the eubacterium Oligotropha carboxidovorans is a 277-kDa Mo- and Cu-containing iron-sulfur flavoprotein. Here, the enzyme's active site in the oxidized or reduced state, after inactivation with potassium cyanide or with n-butylisocyanide bound to the active site, has been reinvestigated by multiple wavelength anomalous dispersion measurements at atomic resolution, electr...

Since iron-sulfur clusters exist in our oxidizing environment, it can be concluded that at one time in our evolutionary history that the environment was instead a reducing environment. Iron-sulfur clusters which contain high spin Fe(II) and Fe(III) tetracoordinated metals can help facilitate electron-transfer processes, nitrogen fixation, catalytic sites in hydrogenases, and oxidation of NADH t...

The only extraterrestrial life detection experiments ever conducted were the three which were components of the 1976 Viking Mission to Mars. Of these, only the Labeled Release experiment obtained a clearly positive response. In this experiment C radiolabeled nutrient was added to the Mars soil samples. Active soils exhibited rapid, substantial gas release. The gas was probably CO2 and, possibly...