Ringo: Interactive Graph Analytics on Big-Memory Machines

We present Ringo, a system for analysis of large graphs. Graphs provide a way to represent and analyze systems of interacting objects (people, proteins, webpages) with edges between the objects denoting interactions (friendships, physical interactions, links). Mining graphs provides valuable insights about individual objects as well as the relationships among them. In building Ringo, we take advantage of the fact that machines with large memory and many cores are widely available and also relatively affordable. This allows us to build an easy-to-use interactive high-performance graph analytics system. Graphs also need to be built from input data, which often resides in the form of relational tables. Thus, Ringo provides rich functionality for manipulating raw input data tables into various kinds of graphs. Furthermore, Ringo also provides over 200 graph analytics functions that can then be applied to constructed graphs. We show that a single big-memory machine provides a very attractive platform for performing analytics on all but the largest graphs as it offers excellent performance and ease of use as compared to alternative approaches. With Ringo, we also demonstrate how to integrate graph analytics with an iterative process of trial-and-error data exploration and rapid experimentation, common in data mining workloads.Comment: 6 pages, 2 figure

Mechanical Fault Detection in Induction Motor Drives through Stator Current Monitoring - Theory and Application Examples

Available from: http://sciyo.com/articles/show/title/mechanical-fault-detection-in-induction-motor-drives-through-stator-current-monitoring-theory-and-apIn a wide variety of industrial applications, an increasing demand exists to improve the reliability and availability of induction motor drives. Common failures occurring in such drives can be classified into electrical and mechanical faults (rotor eccentricity, bearing faults, shaft misalignment, load unbalance, gearbox fault or general failure in the load part of the drive). Mechanical faults are most commonly detected through vibration or noise monitoring, but stator current monitoring is an interesting alternative. Indeed, current sensors are cost-effective, easy to implement, and most drives already contain such sensors for protection and control purposes. However, the effects of mechanical faults on the stator currents are more indirect compared to vibration or noise analysis. This work focuses on various aspects of mechanical fault detection through stator current monitoring, starting from a general theoretical analysis to signal processing methods for fault detection and several application examples

Evaluation De La Qualité Physico-Chimique et Microbiologique Des Eaux De Puits Consommées Dans Le Quartier Kombé À Brazzaville

La présente étude vise à évaluer la qualité physico-chimique et microbiologique des eaux de puits consommées dans le quartier Kombé à Brazzaville. Quatre puits ont été identifiés et caractérisés. La caractérisation a montré trois puits équipés des mêmes systèmes de protection et de remontée d'eau et, un seul point de prélèvement diffère des autres par le système de remontée d'eau. Trente-trois paramètres physico-chimiques et neuf paramètres microbiologiques ont été évalués par des méthodes normées et référencées. Les résultats obtenus révèlent du point de vue physico-chimique que, les eaux de puits étudiées sont faiblement minéralisées et tous les paramètres physico-chimiques répondent aux normes de l'OMS, excepté le pH, la concentration des ions cadmium, chrome, phosphate ainsi que de la silice dans certains cas. La projection des points d’eau sur le diagramme de Piper montre deux familles chimiques : les eaux chlorurées sodique et potassique et les eaux bicarbonatées sodique et potassique. Par contre, les eaux consommées par la population de quartier Kombé sont fortement chargées en E.coli, salmonella et shigella, coliformes totaux, pseudomonas aeruginosa, germes totaux, staphylocoques et, levures et moisissures et sont impropres à la consommation humaine. Avant leur consommation ces eaux doivent subir quelques traitements préliminaires comme la correction du pH à la chaux et la désinfection à l’hypochlorite de sodium.   This study aims to assess the physico-chemical and microbiological quality of well water consumed in the Kombé district in Brazzaville. Four wells have been identified and characterized. The characterization showed three wells equipped with the same protection and upwelling systems and only one sampling point differs from the others by the upwelling system. Thirty-three physico-chemical parameters and nine microbiological parameters were evaluated by standardized and referenced methods. The results obtained reveal from the physico-chemical point of view that the waters of the wells studied are weakly mineralized and all the physico-chemical parameters meet WHO standards, except the pH, the concentration of cadmium, chromium and phosphate ions as well as than silica in some cases. The projection of the water points on the Piper diagram shows two chemical families: sodium and potassium chlorinated waters and sodium and potassium bicarbonate waters. On the other hand, the water consumed by the population of the Kombé district is heavily loaded with E.coli, salmonella and shigella, total coliforms, pseudomonas aeruginosa, total germs, staphylococci and yeasts and molds and is unfit for human consumption. Before being consumed, this water must undergo some preliminary treatments such as pH correction with lime and disinfection with sodium hypochlorite

Evaluation De La Qualité Physico-Chimique et Microbiologique Des Eaux De Puits Consommées Dans Le Quartier Kombé À Brazzaville

La présente étude vise à évaluer la qualité physico-chimique et microbiologique des eaux de puits consommées dans le quartier Kombé à Brazzaville. Quatre puits ont été identifiés et caractérisés. La caractérisation a montré trois puits équipés des mêmes systèmes de protection et de remontée d'eau et, un seul point de prélèvement diffère des autres par le système de remontée d'eau. Trente-trois paramètres physico-chimiques et neuf paramètres microbiologiques ont été évalués par des méthodes normées et référencées. Les résultats obtenus révèlent du point de vue physico-chimique que, les eaux de puits étudiées sont faiblement minéralisées et tous les paramètres physico-chimiques répondent aux normes de l'OMS, excepté le pH, la concentration des ions cadmium, chrome, phosphate ainsi que de la silice dans certains cas. La projection des points d’eau sur le diagramme de Piper montre deux familles chimiques : les eaux chlorurées sodique et potassique et les eaux bicarbonatées sodique et potassique. Par contre, les eaux consommées par la population de quartier Kombé sont fortement chargées en E.coli, salmonella et shigella, coliformes totaux, pseudomonas aeruginosa, germes totaux, staphylocoques et, levures et moisissures et sont impropres à la consommation humaine. Avant leur consommation ces eaux doivent subir quelques traitements préliminaires comme la correction du pH à la chaux et la désinfection à l’hypochlorite de sodium.   This study aims to assess the physico-chemical and microbiological quality of well water consumed in the Kombé district in Brazzaville. Four wells have been identified and characterized. The characterization showed three wells equipped with the same protection and upwelling systems and only one sampling point differs from the others by the upwelling system. Thirty-three physico-chemical parameters and nine microbiological parameters were evaluated by standardized and referenced methods. The results obtained reveal from the physico-chemical point of view that the waters of the wells studied are weakly mineralized and all the physico-chemical parameters meet WHO standards, except the pH, the concentration of cadmium, chromium and phosphate ions as well as than silica in some cases. The projection of the water points on the Piper diagram shows two chemical families: sodium and potassium chlorinated waters and sodium and potassium bicarbonate waters. On the other hand, the water consumed by the population of the Kombé district is heavily loaded with E.coli, salmonella and shigella, total coliforms, pseudomonas aeruginosa, total germs, staphylococci and yeasts and molds and is unfit for human consumption. Before being consumed, this water must undergo some preliminary treatments such as pH correction with lime and disinfection with sodium hypochlorite

The Galaxy Evolution Explorer

The Galaxy Evolution Explorer (GALEX), a NASA Small Explorer Mission planned for launch in Fall 2002, will perform the first Space Ultraviolet sky survey. Five imaging surveys in each of two bands (1350-1750Å and 1750-2800Å) will range from an all-sky survey (limit m_(AB)~20-21) to an ultra-deep survey of 4 square degrees (limit m_(AB)~26). Three spectroscopic grism surveys (R=100-300) will be performed with various depths (m_(AB)~20-25) and sky coverage (100 to 2 square degrees) over the 1350-2800Å band. The instrument includes a 50 cm modified Ritchey-Chrétien telescope, a dichroic beam splitter and astigmatism corrector, two large sealed tube microchannel plate detectors to simultaneously cover the two bands and the 1.2 degree field of view. A rotating wheel provides either imaging or grism spectroscopy with transmitting optics. We will use the measured UV properties of local galaxies, along with corollary observations, to calibrate the UV-global star formation rate relationship in galaxies. We will apply this calibration to distant galaxies discovered in the deep imaging and spectroscopic surveys to map the history of star formation in the universe over the red shift range zero to two. The GALEX mission will include an Associate Investigator program for additional observations and supporting data analysis. This will support a wide variety of investigations made possible by the first UV sky survey