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  1. MBL Research in the Rio Tinto

    NSDL National Science Digital Library

    L. Amaral Zettler

    This web site describes ongoing research of the Marine Biological Laboratory's Astrobiology Group in the Rio Tinto, Spain. The resource includes an image-rich introduction to the Rio Tinto, images of sample sites, information about Rio Tinto biofilms, a list of Rio Tinto references, and a 10-page print-version pdf document including information found on the web site.

  2. Tinto Vallis Fluvial Channel

    NASA Technical Reports Server (NTRS)

    2004-01-01

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    [figure removed for brevity, see original site]

    This night time IR image shows a small fluvial channel located near Tinto Vallis. These channels are northeast of Tyrrhena Patera and its related lava flows. Tyrrhena Patera is one of the larger volcanic complexs in the southern hemisphere of Mars. Small channels are easy to see in nighttime IR, with the cold channel floor (dark) contrasting from the warmer (bright) surroundings.

    NOTE: in nighttime images North is to the bottom of the image.

    Image information: IR instrument. Latitude -24.6, Longitude 349.7 East (10.3 West). 100 meter/pixel resolution.

    Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.

    NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.

  3. Mars Analog Rio Tinto Experiment (MARTE): 2003 Drilling Campaign to Search for a Subsurface Biosphere at Rio Tinto Spain

    NASA Technical Reports Server (NTRS)

    Stoker, Carol; Dunagan, Stephen; Stevens, Todd; Amils, Ricardo; Gomez-Elvira, Javier; Fernandez, David; Hall, James; Lynch, Kennda; Cannon, Howard; Zavaleta, Jhony

    2004-01-01

    The MARTE (Mars Astrobiology Research and Technology Experiment) project, an ASTEP field experiment, is exploring for a hypothesized subsurface anaerobic chemoautotrophic biosphere in the region of the Tinto River- or Rio Tinto- in southwestern Spain. It is also demonstrating technology needed to search for a subsurface biosphere on Mars. The project has three primary objectives: (1) search for and characterize subsurface life at Rio Tinto along with the physical and chemical properties and sustaining energy sources of its environment, (2) perform a high fidelity simulation of a robotic Mars drilling mission to search for life, and (3) demonstrate the drilling, sample handling, and instrument technologies relevant to searching for life on Mars. The simulation of the robotic drilling mission is guided by the results of the aseptic drilling campaign to search for life at Rio Tinto. This paper describes results of the first phase of the aseptic drilling campaign.

  4. Professor Jan Cilliers, Rio Tinto Professor of Mineral Processing

    E-print Network

    Professor Jan Cilliers, Rio Tinto Professor of Mineral Processing `Foam, froth and flotation or;20 Comminution ­ Breaking the rock · Break rocks so that each particle is one mineral type, either valuable or waste · Only about 2% is valuable mineral, the rest is waste #12;21 Autogenous Mill #12;22 Autogenous

  5. Ro Tinto: A Geochemical and Mineralogical Terrestrial Analogue of Mars

    NASA Astrophysics Data System (ADS)

    Amils, Ricardo; Fernndez-Remolar, David

    2014-09-01

    The geomicrobiological characterization of the water column and sediments of Ro Tinto (Huelva, Southwestern Spain) have proven the importance of the iron and the sulfur cycles, not only in generating the extreme conditions of the habitat (low pH, high concentration of toxic heavy metals), but also in maintaining the high level of microbial diversity detected in the basin. It has been proven that the extreme acidic conditions of Ro Tinto basin are not the product of 5000 years of mining activity in the area, but the consequence of an active underground bioreactor that obtains its energy from the massive sulfidic minerals existing in the Iberian Pyrite Belt. Two drilling projects, MARTE (Mars Astrobiology Research and Technology Experiment) (2003-2006) and IPBSL (Iberian Pyrite Belt Subsurface Life Detection) (2011-2015), were developed and carried out to provide evidence of subsurface microbial activity and the potential resources that support these activities. The reduced substrates and the oxidants that drive the system appear to come from the rock matrix. These resources need only groundwater to launch diverse microbial metabolisms. The similarities between the vast sulfate and iron oxide deposits on Mars and the main sulfide bioleaching products found in the Tinto basin have given Ro Tinto the status of a geochemical and mineralogical Mars terrestrial analogue.

  6. Ro Tinto: A Geochemical and Mineralogical Terrestrial Analogue of Mars

    PubMed Central

    Amils, Ricardo; Fernndez-Remolar, David

    2014-01-01

    The geomicrobiological characterization of the water column and sediments of Ro Tinto (Huelva, Southwestern Spain) have proven the importance of the iron and the sulfur cycles, not only in generating the extreme conditions of the habitat (low pH, high concentration of toxic heavy metals), but also in maintaining the high level of microbial diversity detected in the basin. It has been proven that the extreme acidic conditions of Ro Tinto basin are not the product of 5000 years of mining activity in the area, but the consequence of an active underground bioreactor that obtains its energy from the massive sulfidic minerals existing in the Iberian Pyrite Belt. Two drilling projects, MARTE (Mars Astrobiology Research and Technology Experiment) (20032006) and IPBSL (Iberian Pyrite Belt Subsurface Life Detection) (20112015), were developed and carried out to provide evidence of subsurface microbial activity and the potential resources that support these activities. The reduced substrates and the oxidants that drive the system appear to come from the rock matrix. These resources need only groundwater to launch diverse microbial metabolisms. The similarities between the vast sulfate and iron oxide deposits on Mars and the main sulfide bioleaching products found in the Tinto basin have given Ro Tinto the status of a geochemical and mineralogical Mars terrestrial analogue. PMID:25370383

  7. Ro tinto: a geochemical and mineralogical terrestrial analogue of Mars.

    PubMed

    Amils, Ricardo; Fernndez-Remolar, David; The Ipbsl Team

    2014-01-01

    The geomicrobiological characterization of the water column and sediments of Ro Tinto (Huelva, Southwestern Spain) have proven the importance of the iron and the sulfur cycles, not only in generating the extreme conditions of the habitat (low pH, high concentration of toxic heavy metals), but also in maintaining the high level of microbial diversity detected in the basin. It has been proven that the extreme acidic conditions of Ro Tinto basin are not the product of 5000 years of mining activity in the area, but the consequence of an active underground bioreactor that obtains its energy from the massive sulfidic minerals existing in the Iberian Pyrite Belt. Two drilling projects, MARTE (Mars Astrobiology Research and Technology Experiment) (2003-2006) and IPBSL (Iberian Pyrite Belt Subsurface Life Detection) (2011-2015), were developed and carried out to provide evidence of subsurface microbial activity and the potential resources that support these activities. The reduced substrates and the oxidants that drive the system appear to come from the rock matrix. These resources need only groundwater to launch diverse microbial metabolisms. The similarities between the vast sulfate and iron oxide deposits on Mars and the main sulfide bioleaching products found in the Tinto basin have given Ro Tinto the status of a geochemical and mineralogical Mars terrestrial analogue. PMID:25370383

  8. An Exploration of Tinto's Integration Framework for Community College Students

    ERIC Educational Resources Information Center

    Karp, Melinda Mechur; Hughes, Katherine L.; O'Gara, Lauren

    2011-01-01

    Tinto's integration framework is often assumed to be inapplicable to the study of student persistence at community colleges because one of the linchpins of the framework--social integration--is considered unlikely to occur for students at these institutions. Community college students are thought to lack the time to participate in activities, such

  9. Governo apresenta reforma da rede do Superior em Maro sem contributo dos reitores

    E-print Network

    Instituto de Sistemas e Robotica

    Governo apresenta reforma da rede do Superior em Maro sem contributo dos reitores O Ministrio da a racionalizao da rede do Superior que vai passar pela cria- o de consrcios entre universida- des e

  10. AVALIAO DA CV. MERLOT PARA ELABORAO DE VINHO TINTO 1

    Microsoft Academic Search

    Luiz Antenor RIZZON; Alberto MIELE

    2004-01-01

    -1 de acidez titulvel; e pH de 3,49. Sob o aspecto sensorial, o vinho Merlot apresenta cor vermelho-violceo com boa intensidade. Gustativamente distingue-se pela maciez, equilbrio e fineza. Palavras-chave: enologia; uva; Vitis vinifera; vinho; caracterizao. SUMMARY EVALUATION OF CV. MERLOT TO MAKE RED WINE - Merlot is a traditional grape of the Saint million wines, Bordeaux region - France. It

  11. Avaliao da cv. Cabernet Sauvignon para elaborao de vinho tinto

    Microsoft Academic Search

    Luiz Antenor Rizzon; Alberto Miele

    2002-01-01

    SUMMARY EVALUATION OF THE CV. CABERNET SAUVIGNON IN THE MANUFACTURE OF RED WINE. The Cabernet Sauvignon grape was developed in Bordeaux, France. It was introduced in Brazil in 1921, but its cultivation in the viticultural region of Serra Gacha only grew since 1980. It is used in the manufacture of aged or young red wines. Due to its importance, this

  12. Audio Interview with Dr. Carol Stoker about MARTE and the Rio Tinto

    NSDL National Science Digital Library

    Carol Stoker

    This site features links to broadcast quality audio files and transcripts from an interview with Dr. Carol Stoker about the Mars Analog Research and Technology Experiment (MARTE) which is to take place near the Rio Tinto in Spain. Interview topics include the MARTE expedition, the definition of an extremophile, the significance of the color and pH of Rio Tinto, equipment for the MARTE experiment, the possibility of a Mars drilling mission, and the resemblance of Rio Tinto geochemistry to that of Mars.

  13. Microbial Community Composition and Ecology of an Acidic Aquatic Environment: The Tinto River, Spain

    NSDL National Science Digital Library

    A. Lopez-Archilla

    This journal article examines the correlation between physicochemical and biological characteristics of the Rio Tinto in Spain. It explains that the extreme acidic environment of the Rio Tinto is due to the metabolic activity of chemolithotrophic microorganisms. The article includes an illustration depicting the geographical position of the Rio Tinto with highlighted sampling and mining sites, tables indicating the values of physio-chemical parameters measured in different seasons and in different rivers, a table listing the taxonomic classification of different microbial groups in the Rio Tinto, a table examining the seasonality of microorganism populations in different sampling sites, phenotypic properties of different sulfur-oxidizing bacteria, and a correlation analysis. A paid subscription to SpringerLink is required to view this article.

  14. Characterization of the Molecular Diversity of Rio Tinto Using a Novel Hydrothermal Vent Biosampler

    NASA Astrophysics Data System (ADS)

    Behar, A. E.; Stam, C. N.; Scalzi, G.; Behncke, S.; Gmez, F.; Venkateswaran, K.

    2010-04-01

    A Hydrothermal Vent Biosampler to collect "pristine" biological samples from complex ecosystems was used to collect samples from the highly acidic Rio Tinto waters. DNA was isolated and universal bacterial, eukaryotic and archaeal primers were used.

  15. Heavy metal anomalies in the Tinto and Odiel River and estuary system, Spain

    Microsoft Academic Search

    C. H. Nelson; P. J. Lamothe

    1993-01-01

    The Tinto and Odiel rivers drain 100 km from the Rio Tinto sulphide mining district, and join at a 20-km long estuary entering\\u000a the Atlantic Ocean. A reconnaissance study of heavy metal anomalies in channel sand and overbank mud of the river and estuary\\u000a by semi-quantitative emission dc-arc spectrographic analysis shows the following upstream to downstream ranges in ppm (?g

  16. Mineralogy and geochemistry of alluvium contaminated by metal mining in the Rio Tinto area, southwest Spain

    Microsoft Academic Search

    Karen A Hudson-Edwards; Christiane Schell; Mark G Macklin

    1999-01-01

    The Rio Tinto in SW Spain drains Cu and pyrite mines which have been in operation since at least the Bronze Age. Extensive metal mining, especially from 1873 to 1954, has resulted in contamination of the Rio Tinto alluvium with As, Cu, Pb, Ag and Zn. X-ray diffraction (XRD), wavelength-dispersive X-ray mapping, scanning electron microscope petrography and X-ray energy-dispersive (EDX)

  17. Eukaryotic Organisms in Extreme Acidic Environments, the Ro Tinto Case

    PubMed Central

    Aguilera, Angeles

    2013-01-01

    A major issue in microbial ecology is to identify the limits of life for growth and survival, and to understand the molecular mechanisms that define these limits. Thus, interest in the biodiversity and ecology of extreme environments has grown in recent years for several reasons. Some are basic and revolve around the idea that extreme environments are believed to reflect early Earth conditions. Others are related to the biotechnological potential of extremophiles. In this regard, the study of extremely acidic environments has become increasingly important since environmental acidity is often caused by microbial activity. Highly acidic environments are relatively scarce worldwide and are generally associated with volcanic activity or mining operations. For most acidic environments, low pH facilitates metal solubility, and therefore acidic waters tend to have high concentrations of heavy metals. However, highly acidic environments are usually inhabited by acidophilic and acidotolerant eukaryotic microorganisms such as algae, amoebas, ciliates, heliozoan and rotifers, not to mention filamentous fungi and yeasts. Here, we review the general trends concerning the diversity and ecophysiology of eukaryotic acidophilic microorganims, as well as summarize our latest results on this topic in one of the largest extreme acidic rivers, Ro Tinto (SW, Spain). PMID:25369810

  18. Geomorphic and Aqueous Chemistry of a Portion of the Upper Rio Tinto System, Spain

    NASA Technical Reports Server (NTRS)

    Osburn, M. R.; Fernandez-Remolar, D. C.; Arvidson, R. E.; Morris, R. V.; Ming, D.; Prieto-Ballesteros, O.; Amils, R.; Stein, T. C.; Heil-Chapdelaine, V.; Friedlander, L. R.; Herndon, B.; Marlow, J.; Rosenberg, S.; Scherpker, K.; Steiner, A.

    2007-01-01

    Observations from the two Mars rovers, Spirit and Opportunity, combined with discoveries of extensive hydrated sulfate deposits from OMEGA and CRISM show that aqueous deposition and alteration involving acidic systems and sulfate deposition has been a key contributor to the martian geologic record. Rio Tinto, Spain, provides a process model for formation of sulfates on Mars by evaporation of acidic waters within shallow fluvial pools, particularly during dry seasons. We present results from a detailed investigation of an upper portion of the Rio Tinto, focusing on geomorphology, clastic sediment transport, and acidic aqueous processes. We also lay out lessons-learned for under-standing sulfate formation and alteration on Mars.

  19. Virus Mineralization at Low pH in the Rio Tinto, Spain

    Microsoft Academic Search

    Jennifer E. Kyle; Karsten Pedersen; F. Grant Ferris

    2008-01-01

    Water and sediment samples were collected from the Rio Tinto in southwestern Spain to assess (1) the presence and diversity of viruses in an acid mine drainage system and (2) determine if relationships occur between geochemical parameters and viral abundance. Epifluroescence microscopy and transmission electron microscopy revealed that viruses are not only present, but geochemical evidence and multivariate statistical analyses

  20. Spectroscopic Raman study of sulphate precipitation sequence in Rio Tinto mining district (SW Spain).

    PubMed

    Rull, Fernando; Guerrero, Julia; Venegas, Gloria; Gzquez, Fernando; Medina, Jess

    2014-06-01

    Acidic waters and sulphate-rich precipitates are typical by-products of mining activity such as in Rio Tinto (Huelva, SW Spain). This river drains pyrite mines situated in the Iberian Pyrite Belt which have been in operation since the Bronze Age and probably constitutes the oldest continuously operating mining activity over the world. In the present work, we have used Raman spectroscopy to study a wide range of natural mineral samples collected at Rio Tinto which origin is related to evaporation and mineral transformation processes in a wet and extreme acidic environment. In addition, we simulated the phenomenon of mineral precipitation in controlled conditions by using a simulator developed at the laboratory evaporating natural water collected at Rio Tinto. Also, a series of experiments using the same waters as small droplets have been carried out using micro-Raman technique. The droplets were placed on substrates with different chemical composition and reactivity. The results reveal that the precipitation sequence occurred in Rio Tinto mainly comprises copiapite and coquimbite group minerals followed by several other low hydrated iron sulphates. The experiments carried out on droplets allow estimating with higher accuracy the precipitation sequence. PMID:23818074

  1. Identification of the subsurface sulfide bodies responsible for acidity in Ro Tinto source water, Spain

    NASA Astrophysics Data System (ADS)

    Gmez-Ortiz, David; Fernndez-Remolar, David C.; Granda, ngel; Quesada, Cecilio; Granda, Teresa; Prieto-Ballesteros, Olga; Molina, Antonio; Amils, Ricardo

    2014-04-01

    The acidic waters of the Ro Tinto rise from several acidic springs that emerge in the area surrounding Pea de Hierro (Fernndez-Remolar et al., 2005). These springs are located above minor normal faults that act as natural conduits for the water from the underlying deep aquifer. Although it has been suggested that the acidity of the river originates from the biooxidation of massive and stockwork sulfides (Fernndez-Remolar et al., 2008a), the location of the source for these acidic solutions has not previously been established. This lack of evidence has been used to suggest that the acidity of the Ro Tinto may be the product of the most conspicuous of the possible source, the extensive mining of the area over approximately the last 5000 years (Davis et al., 2000). In this paper, we report resistivity and time-domain electromagnetic sounding data from the Ro Tinto aquifer to a depth of ?600 m, revealing the locations for the acidic sources. Both types of data support the presence of two distinct geological units that we interpret as thrust sheets emplaced onto each other during the Variscan orogeny of the Carboniferous. These units, both of which contain massive and stockwork sulfides, act as the aquifer for the acidic waters of the Ro Tinto. Under this scenario, which is in agreement with the geological record of the Ro Tinto fluvial system for the past 6 Ma (Moreno et al., 2003), our results imply that mining activity had little influence on the generation of the acidic river waters.

  2. Metal biogeochemistry in the TintoOdiel rivers (Southern Spain) and in the Gulf of Cadiz: a synthesis of the results of TOROS project

    Microsoft Academic Search

    Franoise Elbaz-Poulichet; Charlotte Braungardt; Eric Achterberg; Nicholas Morley; Daniel Cossa; Jean-Marie Beckers; Philippe Nomrange; Antonio Cruzado; Marc Leblanc

    2001-01-01

    TOROS (TintoOdielRiverOcean Study) has been studying the biogeochemical processes which control metals and nutrients cycling in the mixing zone of the Tinto and Odiel rivers (SW Spain) and has established the fate of metals in the Gulf of Cadiz in relation to hydrodynamics and biological activity. The Tinto and Odiel rivers are small, with a combined mean discharge of 18m3\\/s.

  3. From ro tinto to Mars: the terrestrial and extraterrestrial ecology of acidophiles.

    PubMed

    Amils, R; Gonzlez-Toril, E; Aguilera, A; Rodrguez, N; Fernndez-Remolar, D; Gmez, F; Garca-Moyano, A; Malki, M; Oggerin, M; Snchez-Andrea, I; Sanz, J L

    2011-01-01

    The recent geomicrobiological characterization of Ro Tinto, Iberian Pyrite Belt (IPB), has proven the importance of the iron cycle, not only in generating the extreme conditions of the habitat (low pH, high concentration of toxic heavy metals) but also in maintaining the high level of microbial diversity, both prokaryotic and eukaryotic, detected in the water column and the sediments. The extreme conditions of the Tinto basin are not the product of industrial contamination but the consequence of the presence of an underground bioreactor that obtains its energy from the massive sulfide minerals of the IPB. To test this hypothesis, a drilling project was carried out to intersect ground waters that interact with the mineral ore in order to provide evidence of subsurface microbial activities and the potential resources to support these activities. The oxidants that drive the system appear to come from the rock matrix, contradicting conventional acid mine drainage models. These resources need only groundwater to launch microbial metabolism. There are several similarities between the vast deposits of sulfates and iron oxides on Mars and the main sulfide-containing iron bioleaching products found in the Tinto. Firstly, the short-lived methane detected both in Mars' atmosphere and in the sediments and subsurface of the IPB and secondly, the abundance of iron, common to both. The physicochemical properties of iron make it a source of energy, a shield against radiation and oxidative stress as well as a natural pH controller. These similarities have led to Ro Tinto's status as a Mars terrestrial analogue. PMID:22050821

  4. The Rio Tinto Mars Analogue site: An extremophilic Raman spectroscopic study

    NASA Astrophysics Data System (ADS)

    Edwards, Howell G. M.; Vandenabeele, Peter; Jorge-Villar, Susana E.; Carter, Elizabeth A.; Perez, Fernando Rull; Hargreaves, Michael D.

    2007-12-01

    The Rio Tinto site is recognised as a terrestrial Mars analogue because of the presence of jarosite and related sulfates which have recently been identified by the NASA Mars Exploration Rover "Opportunity" in the El Capitan region of Meridiani Planum on Mars. It has long been known that acidophilic microbial action is responsible for the deep blood-red colour of the water in Rio Tinto, where the pH varies from about 1.5 to 3.0 and the water is rich in iron and sulfur. Following recent Raman spectroscopic characterisation of the mineral phases of the Rio Tinto system, we report here a study of the biological components found in several specimens of deposited minerals and near the waterside that were collected during a GeoRaman VI Conference organized field trip in 2006. Key biosignatures were found for carotenoids, scytonemin and mycosporine-like amino acids, which are indicative of the biological colonisation of exposed mineral substrates; information from this study will be useful for targeting Martian sites using a miniaturized Raman instrument where the biosignatures of relict or extant life could remain in the geological record.

  5. The Rio Tinto Mars analogue site: an extremophilic Raman spectroscopic study.

    PubMed

    Edwards, Howell G M; Vandenabeele, Peter; Jorge-Villar, Susana E; Carter, Elizabeth A; Perez, Fernando Rull; Hargreaves, Michael D

    2007-12-15

    The Rio Tinto site is recognised as a terrestrial Mars analogue because of the presence of jarosite and related sulfates which have recently been identified by the NASA Mars Exploration Rover "Opportunity" in the El Capitan region of Meridiani Planum on Mars. It has long been known that acidophilic microbial action is responsible for the deep blood-red colour of the water in Rio Tinto, where the pH varies from about 1.5 to 3.0 and the water is rich in iron and sulfur. Following recent Raman spectroscopic characterisation of the mineral phases of the Rio Tinto system, we report here a study of the biological components found in several specimens of deposited minerals and near the waterside that were collected during a GeoRaman VI Conference organized field trip in 2006. Key biosignatures were found for carotenoids, scytonemin and mycosporine-like amino acids, which are indicative of the biological colonisation of exposed mineral substrates; information from this study will be useful for targeting Martian sites using a miniaturized Raman instrument where the biosignatures of relict or extant life could remain in the geological record. PMID:17600759

  6. Fossilization potential of iron-bearing minerals in acidic environments of Rio Tinto, Spain: Implications for Mars exploration

    NASA Astrophysics Data System (ADS)

    Fernndez-Remolar, David C.; Knoll, Andrew H.

    2008-03-01

    Acidic waters of the Rio Tinto, southwestern Spain, evaporate seasonally, precipitating a variety of iron sulfide and oxide minerals. Schwertmannite and nanophase goethite form thin laminae on biological and detrital grain surfaces, replicating, among other things, the morphologies of insect cuticle, plant tissues, fungi, algae, and bacteria. Intergrain cements also incorporate bacterial cells and filaments. Other sulfate minerals precipitated in Rio Tinto environments are transient and contribute little to short-term preservation. Because the Rio Tinto has been cutting its current valley for several million years, terrace deposits provide a window on longer term fossil preservation. Early and later diagenesis are recorded in terrace deposits formed about one thousand and two million years ago, respectively. The sedimentary structures and mineralogies of these deposits suggest that they formed under physical and chemical conditions comparable to those of modern Rio Tinto sediments. The terrace deposits show quantitative loss of sulfate minerals, increasing crystallinity of goethite and, in the older terrace, replacement of goethite by hematite. Fossils formed originally by schwertmannite and nanophase goethite replication persist through diagenesis, preserving a long term record of local biological diversity. Fossil preservation by iron oxides in the acidic environment of Rio Tinto suggests that if life was present when sedimentary rocks formed at Meridiani Planum, Mars, precipitated minerals could record their presence.

  7. Identification of Hydrated Sulfates Collected in the Northern Rio Tinto Valley by Reflectance and Raman Spectroscopy

    NASA Technical Reports Server (NTRS)

    Chemtob, S. M.; Arvidson, R. E.; Fernandez-Remolar, D. C.; Amils, R.; Morris, R. V.; Ming, D. W.; Prieto-Ballesteros, O.; Mustard, J. F.; Hutchinson, L.; Stein, T. C.; Donovan, C. E.; Fairchild, G. M.; Friedlander, L. R.; Karas, N. M.; Klasen, N.; Mendenhall, M. P.; Robinson, E. M.; Steinhardt, S. E.; Weber, L. R.

    2006-01-01

    OMEGA recently identified spectral signatures of kieserite, gypsum, and other polyhydrated sulfates at multiple locations on the surface of Mars [1,2]. The presence of sulfates was confirmed through in situ spectroscopy by MER Opportunity [3]. An approach to validate these interpretations is to collect corresponding spectral data from sulfate-rich terrestrial analog sites. The northern Rio Tinto Valley near Nerva, Spain, is a good Martian analog locale because it features extensive seasonal sulfate mineralization driven by highly acidic waters [4]. We report on mineralogical compositions identified by field VNIR spectroscopy and laboratory Raman spectroscopy.

  8. Heavy metal anomalies in the Tinto and Odiel River and estuary system, Spain

    USGS Publications Warehouse

    Nelson, C.H.; Lamothe, P.J.

    1993-01-01

    The Tinto and Odiel rivers drain 100 km from the Rio Tinto sulphide mining district, and join at a 20-km long estuary entering the Atlantic Ocean. A reconnaissance study of heavy metal anomalies in channel sand and overbank mud of the river and estuary by semi-quantitative emission dc-arc spectrographic analysis shows the following upstream to downstream ranges in ppm (??g g-1): As 3,000 to <200, Cd 30 to <0.1, Cu 1,500 to 10, Pb 2,000 to <10, Sb 3000 to <150, and Zn 3,000 to <200. Organic-rich (1.3-2.6% total organic carbon, TOC), sandysilty overbank clay has been analyzed to represent suspended load materials. The high content of heavy metals in the overbank clay throughout the river and estuary systems indicates the importance of suspended sediment transport for dispersing heavy metals from natural erosion and anthropogenic mining activities of the sulfide deposit. The organic-poor (0.21-0.37% TOC) river bed sand has been analyzed to represent bedload transport of naturally-occurring sulfide minerals. The sand has high concentrations of metals upstream but these decrease an order of magnitude in the lower estuary. Although heavy metal contamination of estuary mouth beach sand has been diluted to background levels estuary mud exhibits increased contamination apparently related to finer grain size, higher organic carbon content, precipitation of river-borne dissolved solids, and input of anthropogenic heavy metals from industrial sources. The contaminated estuary mud disperses to the inner shelf mud belt and offshore suspended sediment, which exhibit metal anomalies from natural erosion and mining of upstream Rio Tinto sulphide lode sources (Pb, Cu, Zn) and industrial activities within the estuary (Fe, Cr, Ti). Because heavy metal contamination of Tinto-Odiel river sediment reaches or exceeds the highest levels encountered in other river sediments of Spain and Europe, a detailed analysis of metals in water and suspended sediment throughout the system, and epidemiological analysis of heavy metal effects in humans is appropriate. ?? 1993 Estuarine Research Federation.

  9. Underground habitats in the Ro Tinto basin: a model for subsurface life habitats on Mars.

    PubMed

    Fernndez-Remolar, David C; Prieto-Ballesteros, Olga; Rodrguez, Nuria; Gmez, Felipe; Amils, Ricardo; Gmez-Elvira, Javier; Stoker, Carol R

    2008-10-01

    A search for evidence of cryptic life in the subsurface region of a fractured Paleozoic volcanosedimentary deposit near the source waters of the Ro Tinto River (Iberian pyrite belt, southwest Spain) was carried out by Mars Astrobiology Research and Technology Experiment (MARTE) project investigators in 2003 and 2004. This conventional deep-drilling experiment is referred to as the MARTE ground truth drilling project. Boreholes were drilled at three sites, and samples from extracted cores were analyzed with light microscopy, scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy. Core leachates were analyzed with ion chromatography, and borehole fluids were analyzed with ion and gas chromatography. Key variables of the groundwater system (e.g., pO(2), pH, and salinity) exhibit huge ranges probably due to surficial oxygenation of overall reducing waters, physical mixing of waters, and biologically mediated water-rock interactions. Mineral distribution is mainly driven by the pH of subsurface solutions, which range from highly acidic to neutral. Borehole fluids contain dissolved gases such as CO(2), CH(4), and H(2). SEM-EDS analyses of core samples revealed evidence of microbes attacking pyrite. The Ro Tinto alteration mechanisms may be similar to subsurface weathering of the martian crust and provide insights into the possible (bio)geochemical cycles that may have accompanied underground habitats in extensive early Mars volcanic regions and associated sulfide ores. PMID:19105758

  10. The magnetic properties of Rio Tinto Basin sediments (Spain): a step towards Martian enviromagnetics

    NASA Astrophysics Data System (ADS)

    McIntosh, G.; Hernandez, F. M.; Remolar, D. F.; de La Presa, P.; Marin, P.; Marcos, V. V.

    2008-12-01

    Exploration by the NASA rover Opportunity revealed sulphate-and haematite-rich sedimentary rocks exposed in surface features of Meridiani Planum, Mars. Sediments of the Rio Tinto Basin, Spain, provide at least a partial analog of Meridiani rocks, thereby facilitating an understanding of mineral precipitation and diagenesis on the Martian surface. Here we present the results of a mineral magnetic study of river terrace deposits of the Rio Tinto system, the deposits ranging from Modern to Plio-Pleistocene in age. A broad range of temperature- and field-dependent measurements have been made which have identified the presence of goethite, haematite and sulphides. Seasonally driven processes are thought to lead to the precipitation of nano-phase goethite which increases in crystallinity with age, eventually being replaced by haematite. Diverse micro-organism populations inhabit the acidic and seasonally dry environments, although organic matter does not persist in the sediments. However, biosignatures are left as casts and molds in the iron oxide minerals. The potential for recognizing their characteristic magnetic signatures, and their extrapolation to Martian environments, will be discussed.

  11. Characterization of a Subsurface Biosphere in a Massive Sulfide Deposits at Rio Tinto, Spain: Implications for Extant Life on Mars

    NASA Technical Reports Server (NTRS)

    Stoker, C. R.; Stevens, T.; Amils, R.; Gomez-Elvira, J.; Rodriquez, N.; Gomez, F.; Gonzalez-Toril, E.; Aguilera, A.; Fernandez-Remolar, D.; Dunagan, S.

    2005-01-01

    The recent discovery of abundant sulfate minerals, particularly Jarosite by the Opportunity Rover at Sinus Merdiani on Mars has been interpreted as evidence for an acidic lake or sea on ancient Mars [1,2], since the mineral Jarosite is soluble in liquid water at pH above 4. The most likely mechanism to produce sufficient protons to acidify a large body of liquid water is near surface oxidation of pyrite rich deposits [3]. The acidic waters of the Rio Tinto, and the associated deposits of Hematite, Goethite, and Jarosite have been recognized as an important chemical analog to the Sinus Merdiani site on Mars [4]. The Rio Tinto is a river in southern Spain that flows 100 km from its source in the Iberian pyrite belt, one of the Earth s largest Volcanically Hosted Massive Sulfide (VHMS) provinces, into the Atlantic ocean. The river originates in artesian springs emanating from ground water that is acidified by the interaction with subsurface pyrite ore deposits. The Mars Analog Rio Tinto Experiment (MARTE) has been investigating the hypothesis that a subsurface biosphere exists at Rio Tinto living within the VHMS deposit living on chemical energy derived from sulfur and iron minerals. Reduced iron and sulfur might provide electron donors for microbial metabolism while in situ oxidized iron or oxidants entrained in recharge water might provide electron acceptors.

  12. Characterization of a Subsurface Biosphere in a Massive Sulfide Deposit At Rio Tinto, Spain: Implications For Extant Life On Mars

    NASA Technical Reports Server (NTRS)

    Stoker, C. R.; Stevens, T.; Amils, R.; Gomez-Elvira, J.; Rodriguez, N.; Gomez, F.; Gonzalez-Toril, E.; Aguilera, A.; Fernandez-Remolar, D.; Dunagan, S.

    2005-01-01

    The recent discovery of abundant sulfate minerals, particularly Jarosite by the Opportunity Rover at Sinus Merdiani on Mars has been interpreted as evidence for an acidic lake or sea on ancient Mars [1,2], since the mineral Jarosite is soluble in liquid water at pH above 4. The most likely mechanism to produce sufficient protons to acidify a large body of liquid water is near surface oxidation of pyrite rich deposits [3]. The acidic waters of the Rio Tinto, and the associated deposits of Hematite, Goethite, and Jarosite have been recognized as an important chemical analog to the Sinus Merdiani site on Mars [4]. The Rio Tinto is a river in southern Spain that flows 100 km from its source in the Iberian pyrite belt, one of the Earth's largest Volcanically Hosted Massive Sulfide (VHMS) provinces, into the Atlantic ocean. The river originates in artesian springs emanating from ground water that is acidified by the interaction with subsurface pyrite ore deposits. The Mars Analog Rio Tinto Experiment (MARTE) has been investigating the hypothesis that a subsurface biosphere exists at Rio Tinto living within the VHMS deposit living on chemical energy derived from sulfur and iron minerals. Reduced iron and sulfur might provide electron donors for microbial metabolism while in situ oxidized iron or oxidants entrained in recharge water might provide electron acceptors.

  13. Multidisciplinary integrated field campaign to an acidic Martian Earth analogue with astrobiological interest: Rio Tinto

    NASA Astrophysics Data System (ADS)

    Gmez, F.; Walter, N.; Amils, R.; Rull, F.; Klingelhfer, A. K.; Kviderova, J.; Sarrazin, P.; Foing, B.; Behar, A.; Fleischer, I.; Parro, V.; Garcia-Villadangos, M.; Blake, D.; Martin Ramos, J. D.; Direito, S.; Mahapatra, P.; Stam, C.; Venkateswaran, K.; Voytek, M.

    2011-07-01

    Recently reported results from latest Mars Orbiters and Rovers missions are transforming our opinion about the red planet. That dry and inhospitable planet reported in the past is becoming a wetter planet with high probabilities of water existence in the past. Nowadays, some results seem to indicate the presence of water beneath the Mars surface. But also mineralogy studies by NASA Opportunity Rover report iron oxides and hydroxides precipitates on Endurance Crater. Sedimentary deposits have been identified at Meridiani Planum. These deposits must have generated in a dune aqueous acidic and oxidizing environment. Similarities appear when we study Rio Tinto, and acidic river under the control of iron. The discovery of extremophiles on Earth widened the window of possibilities for life to develop in the Universe, and as a consequence on Mars and other planetary bodies with astrobiological interest. The compilation of data produced by the ongoing missions offers an interested view for life possibilities to exist: signs of an early wet Mars and rather recent volcanic activity as well as ground morphological characteristics that seem to be promoted by liquid water. The discovery of important accumulations of sulfates and the existence of iron minerals such as jarosite in rocks of sedimentary origin has allowed specific terrestrial models to come into focus. Ro Tinto (Southwestern Spain, Iberian Pyritic Belt) is an extreme acidic environment, product of the chemolithotrophic activity of micro-organisms that thrive in the massive pyrite-rich deposits of the Iberian Pyritic Belt. Some particular protective environments should house the organic molecules and bacterial life forms in harsh environments such as Mars surface supporting microniches inside precipitated minerals or inside rocks. Terrestrial analogues could help us to afford the comprehension of habitability (on other planetary bodies). We are reporting here the multidisciplinary study of some endolithic niches inside salt deposits used by phototrophs for taking advantage of sheltering particular light wavelengths. These acidic salts deposits located in Ro Tinto shelter life forms that are difficult to visualize by eye. This interdisciplinary field analogue campaign was conducted in the framework of the CAREX FP7 EC programme.

  14. Subsurface geomicrobiology in a Mars terrestrial analogue, Ro Tinto (SW, Spain)

    NASA Astrophysics Data System (ADS)

    Amils, R.; Fernndez-Remolar, D.; Gmez, F.; Gonzlez-Toril, E.; Rodrguez, N.; Prieto-Ballesteros, O.; Sanz, J. L.; Daz, E.; Stoker, C.

    2008-09-01

    Since its discovery, only few years ago, subsurface geomicrobiology is a matter of growing interest [1]. From a fundamental point of view, it seeks to determine whether life can be sustained in the absence of radiation. From an astrobiological point of view, it is an interesting model for life in other planetary bodies, e.g., Mars, as well as early life on Earth. Ro Tinto is an unusual extreme acidic environment due to its size (around 100 km), constant acidic pH (mean pH 2.3), high concentrations of heavy metals and high level of microbial diversity [2]. Ro Tinto rises in the core of the Iberian Pyritic Belt, one of the biggest sulfidic ore deposits in the world [3]. Today it is well stablished that the extreme characteristics of Ro Tinto are not due to acid mine drainage from mining activity, as has been suggested in the past. To explore the hypothesis that a continuous underground reactor of chemolithotrophic microorganisms thriving in the rich sulfidic minerals of the Iberian Pyritic Belt is responsible for the extreme conditions found in the system, a drilling project has been developed to detect evidence of subsurface microbial activity and potential resources to support these microbial communities in situ (MARTE project) [4]. Here we report a search for subsurface life in volcanically hosted massive sulfidic deposits from the Iberian Pyritic Belt. Aseptic core samples were obtained within and down-gradient from the massive sulfide deposits and formation water was sampled within the resulting bore holes. Microbial activity was detected in un-contaminated samples by culture-dependent and culture-independent methods. Aerobic iron- and sulfide- oxidizing bacteria, and anaerobic denitrifying thiosulfate-oxidizing bacteria, sulfate reducing bacteria and methanogenic archaea have been identified. Potential energy fluxes detected in the system include oxidation of reduced iron and sulfur, or hydrogen gas coupled to nitrite, sulfate, ferric iron, inorganic carbon or transient oxygen. These results suggest that multiple energy sources are available from sulfide-mineral weathering to support microbial metabolism, even in the absence of atmospheric oxygen. [1] Stevens, T.O and McKinley, J.P. (1995) Scienc,, 270, 450-454. [2] Amis, R. et al. (2007) Planet Space Sci, 55, 370- 381. [3] Fernndez-Remolar, D. et al. (2005) Earth Planet Sci Lett, 240, 149-167. [4] Amils, R. et al. (2008) Microbiology of Extreme Soils, 205-223.

  15. The Rio Tinto Basin, Spain: Mineralogy, Sedimentary Geobiology, and Implications for Interpretation of Outcrop Rocks at Meridiani Planum, Mars

    NASA Technical Reports Server (NTRS)

    Fernandez-Remolar, David C.; Morris, Richard V.; Gruener, John E.; Amils, Ricardo; Knoll, Andrew H.

    2005-01-01

    Exploration by the NASA rover Opportunity has revealed sulfate- and hematite-rich sedimentary rocks exposed in craters and other surface features of Meridiani Planum, Mars. Modern, Holocene, and Plio-Pleistocene deposits of the Rio Tinto, southwestern Spain, provide at least a partial environmental analog to Meridiani Planum rocks, facilitating our understanding of Meridiani mineral precipitation and diagenesis, while informing considerations of martian astrobiology. Oxidation, thought to be biologically mediated, of pyritic ore bodies by groundwaters in the source area of the Rio Tinto generates headwaters enriched in sulfuric acid and ferric iron. Seasonal evaporation of river water drives precipitation of hydronium jarosite and schwertmannite, while (Mg,Al,Fe(sup 3+))-copiapite, coquimbite, gypsum, and other sulfate minerals precipitate nearby as efflorescences where locally variable source waters are brought to the surface by capillary action. During the wet season, hydrolysis of sulfate salts results in the precipitation of nanophase goethite. Holocene and Plio-Pleistocene terraces show increasing goethite crystallinity and then replacement of goethite with hematite through time. Hematite in Meridiani spherules also formed during diagenesis, although whether these replaced precursor goethite or precipitated directly from groundwaters is not known. The retention of jarosite and other soluble sulfate salts suggests that water limited the diagenesis of Meridiani rocks. Diverse prokaryotic and eukaryotic microorganisms inhabit acidic and seasonally dry Rio Tinto environments. Organic matter does not persist in Rio Tinto sediments, but biosignatures imparted to sedimentary rocks as macroscopic textures of coated microbial streamers, surface blisters formed by biogenic gas, and microfossils preserved as casts and molds in iron oxides help to shape strategies for astrobiological investigation of Meridiani outcrops.

  16. Searching for Life Underground: An Analysis of Remote Sensing Observations of a Drill Core from Rio Tinto, Spain for Mineralogical Indications of Biological Activity

    NASA Technical Reports Server (NTRS)

    Battler, M.; Stoker, C.

    2005-01-01

    Water is unstable on the surface of Mars, and therefore the Martian surface is not likely to support life. It is possible, however, that liquid water exists beneath the surface of Mars, and thus life might also be found in the subsurface. Subsurface life would most likely be microbial, anaerobic, and chemoautotrophic; these types of biospheres on Earth are rare, and not well understood. Finding water and life are high priorities for Mars exploration, and therefore it is important that we learn to explore the subsurface robotically, by drilling. The Mars Analog Rio Tinto Experiment (MARTE), has searched successfully for a subsurface biosphere at Rio Tinto, Spain [1,2,3,4]. The Rio Tinto study site was selected to search for a subsurface biosphere because the extremely low pH and high concentrations of elements such as iron and copper in the Tinto River suggest the presence of a chemoautotrophic biosphere in the subsurface beneath the river. The Rio Tinto has been recognized as an important mineralogical analog to the Sinus Meridiani site on Mars [5].

  17. Contrasting Microbial Community Assembly Hypotheses: A Reconciling Tale from the Ro Tinto

    PubMed Central

    Palacios, Carmen; Zettler, Erik; Amils, Ricardo; Amaral-Zettler, Linda

    2008-01-01

    Background The Ro Tinto (RT) is distinguished from other acid mine drainage systems by its natural and ancient origins. Microbial life from all three domains flourishes in this ecosystem, but bacteria dominate metabolic processes that perpetuate environmental extremes. While the patchy geochemistry of the RT likely influences the dynamics of bacterial populations, demonstrating which environmental variables shape microbial diversity and unveiling the mechanisms underlying observed patterns, remain major challenges in microbial ecology whose answers rely upon detailed assessments of community structures coupled with fine-scale measurements of physico-chemical parameters. Methodology/Principal Findings By using high-throughput environmental tag sequencing we achieved saturation of richness estimators for the first time in the RT. We found that environmental factors dictate the distribution of the most abundant taxa in this system, but stochastic niche differentiation processes, such as mutation and dispersal, also contribute to observed diversity patterns. Conclusions/Significance We predict that studies providing clues to the evolutionary and ecological processes underlying microbial distributions will reconcile the ongoing debate between the Baas Becking vs. Hubbell community assembly hypotheses. PMID:19052647

  18. Prokaryotic community structure in algal photosynthetic biofilms from extreme acidic streams in Ro Tinto (Huelva, Spain).

    PubMed

    Souza-Egipsy, Virginia; Gonzlez-Toril, Elena; Zettler, Erik; Amaral-Zettler, Linda; Aguilera, Angeles; Amils, Ricardo

    2008-12-01

    Four algal photosynthetic biofilms were collected from the Ro Tinto (SW Spain) at four localities: AG, Euglena and Pinnularia biofilms; ANG, Chlorella and Pinnularia biofilms; RI, Cyanidium and Dunaliella biofilms; and CEM, Cyanidium, Euglena and Pinnularia biofilms. Community composition and structure were studied by a polyphasic approach consisting of 16S rRNA analysis, scanning electron microscopy by back-scattered electron detection mode (SEM-BSE), and fluorescence in-situ hybridization (FISH). Acidophilic prokaryotes associated with algal photosynthetic biofilms included sequences related to the Alpha-, Beta-, and Gammaproteobacteria (phylum Proteobacteria) and to the phyla Nitrospira, Actinobacteria, Acidobacteria and Firmicutes. Sequences from the Archaea domain were also identified. No more than seven distinct lineages were detected in any biofilm, except for those from RI, which contained fewer groups of Bacteria. Prokaryotic communities of the thinnest algal photosynthetic biofilms (-100 microm) were more related to those in the water column, including Leptospirillum populations. In general, thick biofilms (200 microm) generate microniches that could facilitate the development of less-adapted microorganisms (coming from the surrounding environment) to extreme conditions, thus resulting in a more diverse prokaryotic biofilm. PMID:19204897

  19. Impact of millennial mining activities on sediments and microfauna of the Tinto River estuary (SW Spain).

    PubMed

    Ruiz, F; Borrego, J; Gonzlez-Regalado, M L; Lpez Gonzlez, N; Carro, B; Abad, M

    2008-07-01

    In this paper, we analyze two short cores collected in the Tinto estuary (SW Spain), and describe the palaeoenvironmental evolution of this area during the last two millennia, along with the influence of historical mining activities and recent industrial pollution on sediments and microfauna (foraminifera and ostracoda). Although there were no significant changes in the distribution of microorganisms, a first pollution period (0-150 AD) was recorded in high sediment pollution by Cu in the shallow palaeochannels of the middle estuary. During this period and the following 1700 years, tolerant pioneer species of both foraminifera and ostracoda were found predominantly in the inner, protected areas of the estuary, while the bottom sediments were subjected to high hydrodynamic gradients, and consequently showed lower density and diversity of organisms. In the last 150 years, acid mine drainage processes, introduction of a new mining period, and the polluted inputs derived from two industrial processes resulted in increased heavy metal contamination of the bottom sediments, and corresponding extirpation of ostracodes and restriction of foraminifers to the inner zones of the estuary. PMID:18538354

  20. Mars Sulfate Formation Sourced in Sulfide-Enriched Subsurface Fluids: The Rio Tinto Model

    NASA Technical Reports Server (NTRS)

    Fernandez-Remolar, D. C.; Prieto-Ballesteros, O.; Osburn, M. R.; Gomez-Ortiz, D.; Arvidson, R. E.; Morris, R. V.; Ming, D.; Amils, R.; Friendlander, L. R.

    2007-01-01

    The extensive evidence for sulfate deposits on Mars provided by analyses of MER and Mars Express data shows that the sulfur played an essential role in the geochemical cycles of the planet, including reservoirs in the atmosphere, hydro-sphere and geosphere. Overall the data are consistent with a fluvial/lacustrine-evaporative origin of at least some of the sulfate deposits, with mineral precipitation through oversaturation of salty acidic fluids enriched in sulfates. This scenario requires reservoirs of sulfur and associated cations, as well as an acidic and oxidizing hydrochemistry which could be provided by surface and subsurface catching of meteoric waters resulting in the presence of sulfur-bearing gases and steam photochemistry. In this work we suggest a new scenario for the extensive generation of sulfates in Mars based on the observation of seasonal changes in the redox and pH of subsurface waters enriched in sulfur that supply the acidic Mars process analog of Rio Tinto. This model considers the long-term subsurface storage of sulfur during most of Noachian and its release from the late Noachian to Hesperian time through weathering by meteoric fluids that would acidify and oxidize the sulfur bearing compounds stored in the subsurface.

  1. Enzyme-Cascade Analysis of the Rio Tinto Subsurface Environment: A Biosensor Experiment

    NASA Technical Reports Server (NTRS)

    McKay, David S.; Lynch, Kennda; Wainwright, Norman; Child, Alice; Williams, Kendra; McKay, David; Amils, Ricardo; Gonzalez, Elena; Stoker, Carol

    2004-01-01

    The Portable Test System (PTS), designed & developed by Charles Rivers Laboratories, Inc. (Charleston, SC) is a portable instrument that was designed to perform analysis of enzymatic assays related to rapid assessment of microbial contamination (Wainwright, 2003). The enzymatic cascade of Limulus Amebocyte Lysate (LAL) is known to be one of the most sensitive techniques available for microbial detection, enabling the PTS to be evaluated as a potential life detection instrument for in situ Astrobiology missions. In the summer of 2003 the system was tested as a part of the Mars Astrobiology Research and Technology Experiment (MARTE) ground truth science campaign in the Rio Tinto Analogue environment near Nerva, Spain. The preliminary results show that the PTS analysis correlates well with the contamination control tests and the more traditional lab-based biological assays performed during the MARTE field mission. Further work will be conducted on this research during a second field campaign in 2004 and a technology demonstration of a prototype instrument that includes autonomous sample preparation will occur in 2005.

  2. Metal uptake and distribution in cultured seedlings of Nerium oleander L. (Apocynaceae) from the Ro Tinto (Huelva, Spain).

    PubMed

    Franco, Alejandro; Rufo, Lourdes; Zuluaga, Javier; de la Fuente, Vicenta

    2013-10-01

    Nerium oleander L. (Apocynaceae) is a micro-nano phanerophyte that grows in the riverbanks of the Ro Tinto basin (Southwest Iberian Peninsula). The waters and soils of the Ro Tinto area are highly acidic and have high concentrations of heavy metals. In this environment, N. oleander naturally grows in both extreme acidic (EA) and less extreme acidic (LEA) water courses, excluding, and bioindicating certain metals. In this work, we compared and evaluated the accumulation preferences and capacities, the distribution and processes of biomineralization of metals (Fe, Cu, Zn, Mn, Mg, Ca) in the first stages of growth of EA and LEA oleanders by means of inductively coupled plasma-mass spectrometry, scanning electron microscopy, and energy dispersive X-ray analyzer analysis. Seeds from both environments were grown and treated with a self-made solution simulating the most extreme red waters from the Ro Tinto. LEA plants drastically reduces the metal uptake at the beginning, but later reactivates the uptake reaching concentration values in the same range as the EA plants. The results showed high Mn, Zn and Mg concentrations, accumulation of Fe and Cu in plants from both environments, differing from the metal concentrations of field-grown oleanders. Iron bioformations with traces of other metals were present inside and over epidermal cells and inside vascular cells of stems and roots. They were absent of leaves. The accumulation properties of N. oleander in its early stages of development make it a species to take in consideration in phytoremediation processes but optimized conditions are needed to ensure enough biomass production. PMID:23892697

  3. Development and structure of eukaryotic biofilms in an extreme acidic environment, rio tinto (SW, Spain).

    PubMed

    Aguilera, Angeles; Souza-Egipsy, Virginia; Gmez, Felipe; Amils, Ricardo

    2007-02-01

    An in situ colonization assay was performed to study the early stages of biofilm formation in Rio Tinto (SW, Spain), an extremely acidic environment (pH ca. 2). Eukaryotic assemblages were monitored at monthly intervals for 1 year. Diversity, colonization rates, and seasonal variations were analyzed. Structural features of naturally grown biofilms were explored by light and scanning electron microscopy in backscattered electron mode. A total of 14 taxa were recognized as constituents of the eukaryotic assemblages. The eukaryotic communities were dissimilar at the different sampling sites. The lowest diversity was found at the most extreme locations, in terms of pH and heavy metal concentrations. The biofilms were mainly formed by species from the genera Dunaliella and Cyanidium. Two genera of filamentous algae, Zygnemopsis and Klebsormidium, were principally responsible for the variability in the cell number throughout the year. These species appear in June to decrease almost completely between October and November. In contrast, the number of heterotrophic flagellates and ciliates remained constant throughout the year. The microcolonization sequence showed an initial accumulation of amorphous particles composed of bacteria and inorganic grains of minerals. By the end of the second month, the organic matrix was also populated by fungi, bacteria, and a few eukaryotic heterotrophs such as amoebae and small flagellates. Diatoms only showed significant colonization in regions where mycelial matrices were first established. Flagellated green algae such as Dunaliella or Chlamydomonas as well as Euglena were also present at the very beginning of the biofilm development, although in low numbers (<100 cells cm(-2)). After the flagellated cells, sessile species of algae such Chlorella or Cyanidium appeared. Filamentous algae were the last species to colonize the biofilms. Most of the naturally grown biofilms were found to be structures composed of different species organized in different layers separated, probably by extracellular polymeric substances, although more analysis should be done in this regard. The possible implications of the biofilm structure in the adaptation to this extreme habitat are discussed. PMID:17268880

  4. Assessing The Value of Hydrological Ensemble Predictions for Rio Tinto Alcan's Hydropower System in Eastern Canada

    NASA Astrophysics Data System (ADS)

    Latraverse1, M.; Cote, P.; Larouche1, B.

    2012-04-01

    Rio Tinto Alcan (RTA) is a multinational aluminium producer with smelters in Quebec, Canada. RTA also owns and operates power houses on Pribonka and Saguenay Rivers. The system, which is run by RTA's Quebec Power Operations Division, consists of 6 generating stations and 3 major reservoirs, for an installed capacity of 2900 MW. One of the significant issues that had to be resolved for effective operation of this system was to determine the volume of water release per week for all generating stations. Several challenges had to be dealt with before a suitable solution could be found. Last year, RTA started a five year R&D project for improving the management of the hydropower system. This project includes data monitoring, hydrological ensemble prediction (HEP) and stochastic optimization methods. A concomitant presentation (submitted to HS5.7 by Cote et al.) describes the stochastic optimization project that aims to assess the value of using a stochastic solver instead of a deterministic one. Cote et al. evaluated two different stochastic optimization approaches: lag-1 Stochastic Dynamic Programming (SDP) and Sampling Stochastic Dynamic Programming (SSDP) algorithms. Both stochastic optimization methods use Hydrological Ensemble Prediction (HEP) to capture the spatio-temporal variability of the inflows. This presentation investigates the value of using different HEP procedures in the operation of RTA's hydropower system with stochastic optimization methods. More precisely, the value of using biased or unbiased HEP, the value of using HEP with a good representation or a misrepresentation of the predictive uncertainties were assessed using a test bench study that mimics real-world RTA's operations. The results indicate that in real world operations, biased HEP or under-dispersed HEP can void the gain obtained by stochastic optimization methods.

  5. Comparative microbial ecology study of the sediments and the water column of the Ro Tinto, an extreme acidic environment.

    PubMed

    Garca-Moyano, Antonio; Gonzlez-Toril, Elena; Aguilera, ngeles; Amils, Ricardo

    2012-08-01

    Due to its highly metalliferous waters and low pH, the Rio Tinto has shown its potential for modelling both acid mine drainage systems and biohydrometallurgical operations. Most geomicrobiological studies of these systems have focused on the oxic water column. A sequence-based approach in combination with in situ detection techniques enabled us to examine the composition and structure of the microbial communities associated with the suboxic and anoxic sediments along the river course and to compare them with the planktonic communities inhabiting the water column. The results obtained with the different approaches were consistent and revealed some major patterns: higher cell density and higher richness (75 vs. 48 operational taxonomic units) in the sediments than in the water column. The microbial communities were related but the river sediments appear to be enriched in certain populations, some of which have not previously been reported in the Rio Tinto basin. The differences detected between sampling stations along the river correlate with certain environmental parameters (e.g. iron concentration gradient). The biological and geochemical data show the importance of the sediments as representing a phase of particular high diversity, probably related to key metabolic processes within both the iron and the sulfur cycles. PMID:22385317

  6. Acid mine drainage pollution in the Tinto and Odiel rivers (Iberian Pyrite Belt, SW Spain) and bioavailability of the transported metals to the Huelva Estuary

    Microsoft Academic Search

    Jos Miguel Nieto; Aguasanta M. Sarmiento; Manuel Olas; Carlos R. Canovas; Inmaculada Riba; Judit Kalman; T. Angel Delvalls

    2007-01-01

    The Tinto and Odiel rivers are seriously affected by acid mine drainage (AMD) from the long-term mining activities in Iberian Pyrite Belt (IPB). As a consequence, the Huelva estuary is heavily contaminated by metals and metalloids. This study presents an estimation of the seasonal variation, and the dissolved contaminant load transported by both rivers from February 2002 to September 2004.

  7. Experiences of African-American Baccalaureate Nursing Students Examined through the Lenses of Tinto's Student Retention Theory and Astin's Student Involvement Theory. ASHE Annual Meeting Paper.

    ERIC Educational Resources Information Center

    Janes, Sharyn

    African-American nurses' perceptions of their baccalaureate nursing school experiences were examined in relation to Vincent Tinto's (1987) theory of student retention and Astin's theory of student involvement. In-depth interviews were conducted with four graduates of a predominantly black southeastern university and four graduates of a

  8. Assessing Stochastic Optimization for Rio Tinto Alcan's Hydropower System in Eastern Canada

    NASA Astrophysics Data System (ADS)

    Cote, P.; Latraverse, M.; Leconte, R.; Larouche, B.

    2012-04-01

    Rio Tinto Alcan (RTA) is a multinational aluminium producer with smelters in Quebec, Canada. RTA also owns and operates power houses on Pribonka and Saguenay Rivers. The system, which is run by RTA's Quebec Power Operations Division, consists of 6 generating stations and 3 major reservoirs, for an installed capacity of 2900 MW. One of the significant issues that had to be resolved for effective operation of this system was to determine the volume of water release per week for all generating stations. Several challenges had to be dealt with before a suitable solution could be found. Last year, RTA started a five year R&D project for improving the management of the hydropower system. This project includes data monitoring, Hydrological Ensemble Prediction (HEP) and stochastic optimization (SO) methods. Development of SO methods is particularly interesting for RTA since, until now, the decision making process has been based on a deterministic solver even if it is impossible to predict naturally contributed volumes with any accuracy beyond a few days. Moreover, the production at the generating stations follows a non-linear, non-convex function of turbine flow rates and water head. Both of these factors have the effect of requiring that the decision should be based upon solving a non-linear and non-convex stochastic optimization problem. The following presentation describes the first part of the SO project and aims to assess the value of using a stochastic solver instead of a deterministic solver. Two different SO approaches were evaluated: lag-1 Stochastic Dynamic Programming (SDP) and Sampling Stochastic Dynamic Programming (SSDP) algorithms. HEP are used to capture the spatio-temporal variability of the inflows. Scenarios are generated using a hydrological model (HM) by initialising the HM with the same initial conditions (hydrologic state variables). These hydrologic variables are estimated using real-time observations available for the catchment area. Inter-scenario variability is provided by using different sequences of meteorological observations entered into the HM. The scenarios are used to estimate the parameters of the auto-regressive model utilized by SDP and the hydrologic state variables are used to estimate the probability transition between scenarios required by the SSDP algorithm. The optimization methods were implemented in RTA's system and the results compared with the actual deterministic decision procedure. Methods were compared using a test bench into which were incorporated the characteristics of the facilities and the HEP database.

  9. Metal biogeochemistry in the Tinto?Odiel rivers (Southern Spain) and in the Gulf of Cadiz: a synthesis of the results of TOROS project

    NASA Astrophysics Data System (ADS)

    Elbaz-Poulichet, Franoise; Braungardt, Charlotte; Achterberg, Eric; Morley, Nicholas; Cossa, Daniel; Beckers, Jean-Marie; Nomrange, Philippe; Cruzado, Antonio; Leblanc, Marc

    2001-12-01

    TOROS (Tinto-Odiel-River-Ocean Study) has been studying the biogeochemical processes which control metals and nutrients cycling in the mixing zone of the Tinto and Odiel rivers (SW Spain) and has established the fate of metals in the Gulf of Cadiz in relation to hydrodynamics and biological activity. The Tinto and Odiel rivers are small, with a combined mean discharge of 18 m 3/s. They drain the largest sulphide mineralisation in the world. Predominantly, Zn-Cu-Pb mineralisation has been worked since 2500 yr BC. The estuarine zone includes both an extensive area of salt marsh and an intensively industrialised urban area. As a consequence of pyrite oxidation, the Tinto and Odiel rivers are strongly acidic (pH<3) with extremely high and variable metal concentrations. Transition metals are poorly removed from the water column in the mixing zone. Moreover, drainage from large phosphogypsum waste deposits contributes to As, Hg, U and phosphate contamination of the estuary. The collapse of the tailing reservoir at los Frailes in 1998 had not impacted the chemistry of the coastal waters up to 6 months later. A large plume of metal-rich waters due to the Tinto and Odiel discharges occurs along the coast of the Gulf of Cadiz. This plume affects seasonally the Atlantic inflow through the Strait of Gibraltar. The dispersion of the metal discharges has been simulated by injection of a tracer in the 3-D hydrodynamical model. Both model and field study clearly show the inflow of metal contaminated Spanish Shelf Water through the Strait of Gibraltar.

  10. Scientific results and lessons learned from an integrated crewed Mars exploration simulation at the Rio Tinto Mars analogue site

    NASA Astrophysics Data System (ADS)

    Orgel, Csilla; Kereszturi, kos; Vczi, Tams; Groemer, Gernot; Sattler, Birgit

    2014-02-01

    Between 15 and 25 April 2011 in the framework of the PolAres programme of the Austrian Space Forum, a five-day field test of the Aouda.X spacesuit simulator was conducted at the Rio Tinto Mars-analogue site in southern Spain. The field crew was supported by a full-scale Mission Control Center (MCC) in Innsbruck, Austria. The field telemetry data were relayed to the MCC, enabling a Remote Science Support (RSS) team to study field data in near-real-time and adjust the flight planning in a flexible manner. We report on the experiences in the field of robotics, geophysics (Ground Penetrating Radar) and geology as well as life sciences in a simulated spaceflight operational environment. Extravehicular Activity (EVA) maps had been prepared using Google Earth and aerial images. The Rio Tinto mining area offers an excellent location for Mars analogue simulations. It is recognised as a terrestrial Mars analogue site because of the presence of jarosite and related sulphates, which have been identified by the NASA Mars Exploration Rover "Opportunity" in the El Capitan region of Meridiani Planum on Mars. The acidic, high ferric-sulphate content water of Rio Tinto is also considered as a possible analogue in astrobiology regarding the analysis of ferric sulphate related biochemical pathways and produced biomarkers. During our Mars simulation, 18 different types of soil and rock samples were collected by the spacesuit tester. The Raman results confirm the presence of minerals expected, such as jarosite, different Fe oxides and oxi-hydroxides, pyrite and complex Mg and Ca sulphates. Eight science experiments were conducted in the field. In this contribution first we list the important findings during the management and realisation of tests, and also a first summary of the scientific results. Based on these experiences suggestions for future analogue work are also summarised. We finish with recommendations for future field missions, including the preparation of the experiments, communication and data transfer - as an aid to the planning of future simulations.

  11. Mars Analog Research and Technology Experiment (MARTE): A Simulated Mars Drilling Mission to Search for Subsurface Life at the Rio Tinto, Spain

    NASA Technical Reports Server (NTRS)

    Stoker, Carol; Lemke, Larry; Mandell, Humboldt; McKay, David; George, Jeffrey; Gomez-Alvera, Javier; Amils, Ricardo; Stevens, Todd; Miller, David

    2003-01-01

    The MARTE (Mars Astrobiology Research and Technology Experiment) project was selected by the new NASA ASTEP program, which supports field experiments having an equal emphasis on Astrobiology science and technology development relevant to future Astrobiology missions. MARTE will search for a hypothesized subsurface anaerobic chemoautotrophic biosphere in the region of the Tinto River in southwestern Spain while also demonstrating technology needed to search for a subsurface biosphere on Mars. The experiment is informed by the strategy for searching for life on Mars.

  12. RIO Tinto Faulted Volcanosedimentary Deposits as Analog Habitats for Extant Subsurface Biospheres on Mars: A Synthesis of the MARTE Drilling Project Geobiology Results

    NASA Technical Reports Server (NTRS)

    Fernandez-Remolar, D. C.; Prieto-Ballesteros, O.; Rodriquez, N.; Davila, F.; Stevens, T.; Amils, R.; Gomez-Elvira, J.; Stoker, C.

    2005-01-01

    Geochemistry and mineralogy on Mars surface characterized by the MER Opportunity Rover suggest that early Mars hosted acidic environments in the Meridiani Planum region [1, 2]. Such extreme paleoenvironments have been suggested to be a regional expression of the global Mars geological cycle that induced acidic conditions by sulfur complexation and iron buffering of aqueous solutions [3]. Under these assumptions, underground reservoirs of acidic brines and, thereby, putative acidic cryptobiospheres, may be expected. The MARTE project [4, 5] has performed a drilling campaign to search for acidic and anaerobic biospheres in R o Tinto basement [6] that may be analogs of these hypothetical communities occurring in cryptic habitats of Mars. This Rio Tinto geological region is characterized by the occurrence of huge metallic deposits of iron sulfides [7]. Late intensive diagenesis of rocks driven by a compressive regimen [8] largely reduced the porosity of rocks and induced a cortical thickening through thrusting and inverse faulting and folding. Such structures play an essential role in transporting and storing water underground as any other aquifers do in the Earth. Once the underground water reservoirs of the Ro Tinto basement contact the hydrothermal pyrite deposits, acidic brines are produced by the release of sulfates and iron through the oxidation of sulfides [9].

  13. Mineralogical In-situ Investigation of Acid-Sulfate Samples from the Rio Tinto River, Spain, with a Portable XRD/XRF Instrument

    NASA Technical Reports Server (NTRS)

    Sarrazin, P.; Ming, D. W.; Morris, R. V.; Fernandez-Remolar, D.; Amils, R.; Arvidson, R. E.; Blake, D.; Bish, D. L.

    2007-01-01

    A field campaign was organized in September 2006 by Centro de Astobiologica (Spain) and Washington University (St Louis, USA) for the geological study of the Rio Tinto river bed sediments using a suite of in-situ instruments comprising an ASD reflectance spectrometer, an emission spectrometer, panoramic and close-up color imaging cameras, a life detection system and NASA's CheMin 4 XRD/XRF prototype. The primary objectives of the field campaign were to study the geology of the site and test the potential of the instrument suite in an astrobiological investigation context for future Mars surface robotic missions. The results of the overall campaign will be presented elsewhere. This paper focuses on the results of the XRD/XRF instrument deployment. The specific objectives of the CheMin 4 prototype in Rio Tinto were to 1) characterize the mineralogy of efflorescent salts in their native environments; 2) analyze the mineralogy of salts and oxides from the modern environment to terraces formed earlier as part of the Rio Tinto evaporative system; and 3) map the transition from hematite-dominated terraces to the mixed goethite/salt-bearing terraces where biosignatures are best preserved.

  14. Assessment of phosphogypsum impact on the salt-marshes of the Tinto river (SW Spain): role of natural attenuation processes.

    PubMed

    Prez-Lpez, Rafael; Castillo, Julio; Sarmiento, Aguasanta M; Nieto, Jos M

    2011-12-01

    About 120 Mton of phosphogypsum from the fertiliser industry were stack-piled on the salt-marshes of the Tinto river (Spain). This paper investigates the capacity of salt-marshes to attenuate contamination due to downward leaching from phosphogypsum. Solids and pore-waters were characterized at different depths of the pile to reach the marsh-ground. In superficial zones, metals were highly mobile, and no reduced sulphur was found. However, pollutant concentration decreased in the pore-water in deeper oxygen-restricted zones. Metal removal occurred by precipitation of newly formed sulphides, being this process main responsible for the contamination attenuation. Pyrite-S was the main sulphide component (up to 2528 mg/kg) and occurred as framboids, leading to high degrees of pyritization (up to 97%). The sulphidization reaction is Fe-limited; however, excess of acid-volatile sulphide over other metals cause precipitation of other sulphides, mainly of Cu and As. This decrease in metal mobility significantly minimises the impact of phosphogypsums on the salt-marshes. PMID:21992931

  15. Trace metal partitioning over a tidal cycle in an estuary affected by acid mine drainage (Tinto estuary, SW Spain).

    PubMed

    Hierro, A; Olas, M; Cnovas, C R; Martn, J E; Bolivar, J P

    2014-11-01

    The Tinto River estuary is highly polluted with the acid lixiviates from old sulphide mines. In this work the behaviour of dissolved and particulate trace metals under strong chemical gradients during a tidal cycle is studied. The pH values range from 4.4 with low tide to 6.9 with high tide. Precipitation of Fe and Al is intense during rising tides and As and Pb are almost exclusively found in the particulate matter (PM). Sorption processes are very important in controlling the mobility (and hence bioavailability) of some metals and particularly affect Cu below pH 6. Above pH~6 Cu is desorbed, probably by the formation of Cu(I)-chloride complexes. Although less pronounced than Cu, also Zn desorption above pH 6.5 seems to occur. Mn and Co are affected by sorption processes at pH higher than ca. 6. Cd behaves conservatively and Ni is slightly affected by sorption processes. PMID:25112821

  16. Classification of modern and old Ro Tinto sedimentary deposits through the biomolecular record using a life marker biochip: implications for detecting life on Mars.

    PubMed

    Parro, Victor; Fernndez-Remolar, David; Rodrguez-Manfredi, Jos A; Cruz-Gil, Patricia; Rivas, Luis A; Ruiz-Bermejo, Marta; Moreno-Paz, Mercedes; Garca-Villadangos, Miriam; Gmez-Ortiz, David; Blanco-Lpez, Yolanda; Menor-Salvn, Csar; Prieto-Ballesteros, Olga; Gmez-Elvira, Javier

    2011-01-01

    The particular mineralogy formed in the acidic conditions of the Ro Tinto has proven to be a first-order analogue for the acid-sulfate aqueous environments of Mars. Therefore, studies about the formation and preservation of biosignatures in the Ro Tinto will provide insights into equivalent processes on Mars. We characterized the biomolecular patterns recorded in samples of modern and old fluvial sediments along a segment of the river by means of an antibody microarray containing more than 200 antibodies (LDCHIP200, for Life Detector Chip) against whole microorganisms, universal biomolecules, or environmental extracts. Samples containing 0.3-0.5?g of solid material were automatically analyzed in situ by the Signs Of LIfe Detector instrument (SOLID2), and the results were corroborated by extensive analysis in the laboratory. Positive antigen-antibody reactions indicated the presence of microbial strains or high-molecular-weight biopolymers that originated from them. The LDCHIP200 results were quantified and subjected to a multivariate analysis for immunoprofiling. We associated similar immunopatterns, and biomolecular markers, to samples with similar sedimentary age. Phyllosilicate-rich samples from modern fluvial sediments gave strong positive reactions with antibodies against bacteria of the genus Acidithiobacillus and against biochemical extracts from Ro Tinto sediments and biofilms. These samples contained high amounts of sugars (mostly polysaccharides) with monosaccharides like glucose, rhamnose, fucose, and so on. By contrast, the older deposits, which are a mix of clastic sands and evaporites, showed only a few positives with LDCHIP200, consistent with lower protein and sugar content. We conclude that LDCHIP200 results can establish a correlation between microenvironments, diagenetic stages, and age with the biomarker profile associated with a sample. Our results would help in the search for putative martian biomarkers in acidic deposits with similar diagenetic maturity. Our LDCHIP200 and SOLID-like instruments may be excellent tools for the search for molecular biomarkers on Mars or other planets. PMID:21294642

  17. Mobility of Po and U-isotopes under acid mine drainage conditions: an experimental approach with samples from Ro Tinto area (SW Spain).

    PubMed

    Barbero, L; Gzquez, M J; Bolvar, J P; Casas-Ruiz, M; Hierro, A; Baskaran, M; Ketterer, M E

    2014-12-01

    Under acid mine drainage (AMD) conditions, the solubilities and mobilities of many elements are vastly different from conditions prevailing in most natural waters. Studies are underway in the Ro Tinto area (Iberian Pyrite Belt), in order to understand the behavior and mobility of long-lived U-series radionuclides under AMD conditions. A set of leaching experiments utilizing typical country rocks from the Tinto River basin, waste rock pile composite materials, iron-rich riverbed sediments and gossan (weathered naturally rock) were performed towards this purpose. Initial leaching experiments using distilled water kept in contact with solid material for 300, 100, 50 and 1h resulted in very low concentrations of U with (234)U/(238)U activity ratios close to equilibrium and activity concentrations of (210)Po<0.03mBq/g. Leaching experiments performed with sulfuric acid media (0.1 and 0.01M), and contact times between the solid and solution for 24h were conducted to quantify the amount of U-isotopes and (210)Po leached, and the radioactive disequilibria generated between the radionuclides in the leachate. These experiments show that Po mobility in acidic conditions (pH around 1-2) is very low, with (210)Po activity in the leachate tobe6% in average for the solid sample. By contrast, mobility of U-isotopes is higher than that of Po, around 1.2%. PMID:24308958

  18. Characterisation of the bio-mineralogical and isotope geochemical signatures of past life in a Mars analogue environment of Rio Tinto, SW of Spain

    NASA Astrophysics Data System (ADS)

    Velasco, E.; Mason, P.; Vroon, P.; Rling, W.; Amils, R.; Davies, G. R.

    2012-09-01

    Iron-rich sulfate minerals are present on Mars hence sulfur, oxygen and iron isotopes could be a key tool for the detection of any past or present life. Experiments with flow through reactors and enrichment cultures have been conducted to investigate the link between the activity of microbial communities and sulfur, oxygen and iron isotope fractionation in Martian like minerals. Sediments from a modern hyper-acidic, Fe-rich subareal environment at Rio Tinto, SW Spain were used in the experiments. This site has been frequently used as a geochemical analogue of Mars. Sediments were sampled from the upper part of Rio Tinto (Marismilla) and the estuary (Moguer). Laboratory incubations were carried out at 30C, using an artificial input solution with sulfate in excess [1]. Initial data from the flow through reactor experiments indicate an extreme sulfur isotope fractionation in the Moguer estuarine part, extending beyond the maximum of 47 predicted by the standard Rees model [2]. These data suggest that, at least, sulfur isotopes have a potential to be sensitive indicators of biotic activity in Martian environments that contain sulfate minerals.

  19. Science Results from a Mars Drilling Simulation (Ro Tinto, Spain) and Ground Truth for Remote Science Observations

    NASA Astrophysics Data System (ADS)

    Bonaccorsi, Rosalba; Stoker, Carol R.

    2008-10-01

    Science results from a field-simulated lander payload and post-mission laboratory investigations provided "ground truth" to interpret remote science observations made as part of the 2005 Mars Astrobiology Research and Technology Experiment (MARTE) drilling mission simulation. The experiment was successful in detecting evidence for life, habitability, and preservation potential of organics in a relevant astrobiological analogue of Mars. Science results. Borehole 7 was drilled near the Ro Tinto headwaters at Pea de Hierro (Spain) in the upper oxidized remnant of an acid rock drainage system. Analysis of 29 cores (215 cm of core was recovered from 606 cm penetrated depth) revealed a matrix of goethite- (42-94%) and hematite-rich (47-87%) rocks with pockets of phyllosilicates (47-74%) and fine- to coarse-grained loose material. Post-mission X-ray diffraction (XRD) analysis confirmed the range of hematite:goethite mixtures that were visually recognizable (1:1, 1:2, and 1:3 mixtures displayed a yellowish-red color whereas 3:1 mixtures displayed a dark reddish-brown color). Organic carbon was poorly preserved in hematite/goethite-rich materials (Corg <0.05 wt %) beneath the biologically active organic-rich soil horizon (Corg 3-11 wt %) in contrast to the phyllosilicate-rich zones (Corg 0.23 wt %). Ground truth vs. remote science analysis. Laboratory-based analytical results were compared to the analyses obtained by a Remote Science Team (RST) using a blind protocol. Ferric iron phases, lithostratigraphy, and inferred geologic history were correctly identified by the RST with the exception of phyllosilicate-rich materials that were misinterpreted as weathered igneous rock. Adenosine 5?-triphosphate (ATP) luminometry, a tool available to the RST, revealed ATP amounts above background noise, i.e., 278-876 Relative Luminosity Units (RLUs) in only 6 cores, whereas organic carbon was detected in all cores. Our manned vs. remote observations based on automated acquisitions during the project provide insights for the preparation of future astrobiology-driven Mars missions.

  20. Science results from a Mars drilling simulation (Ro Tinto, Spain) and ground truth for remote science observations.

    PubMed

    Bonaccorsi, Rosalba; Stoker, Carol R

    2008-10-01

    Science results from a field-simulated lander payload and post-mission laboratory investigations provided "ground truth" to interpret remote science observations made as part of the 2005 Mars Astrobiology Research and Technology Experiment (MARTE) drilling mission simulation. The experiment was successful in detecting evidence for life, habitability, and preservation potential of organics in a relevant astrobiological analogue of Mars. SCIENCE RESULTS: Borehole 7 was drilled near the Ro Tinto headwaters at Pea de Hierro (Spain) in the upper oxidized remnant of an acid rock drainage system. Analysis of 29 cores (215 cm of core was recovered from 606 cm penetrated depth) revealed a matrix of goethite- (42-94%) and hematite-rich (47-87%) rocks with pockets of phyllosilicates (47-74%) and fine- to coarse-grained loose material. Post-mission X-ray diffraction (XRD) analysis confirmed the range of hematite:goethite mixtures that were visually recognizable (approximately 1:1, approximately 1:2, and approximately 1:3 mixtures displayed a yellowish-red color whereas 3:1 mixtures displayed a dark reddish-brown color). Organic carbon was poorly preserved in hematite/goethite-rich materials (C(org) <0.05 wt %) beneath the biologically active organic-rich soil horizon (C(org) approximately 3-11 wt %) in contrast to the phyllosilicate-rich zones (C(org) approximately 0.23 wt %). GROUND TRUTH VS. REMOTE SCIENCE ANALYSIS: Laboratory-based analytical results were compared to the analyses obtained by a Remote Science Team (RST) using a blind protocol. Ferric iron phases, lithostratigraphy, and inferred geologic history were correctly identified by the RST with the exception of phyllosilicate-rich materials that were misinterpreted as weathered igneous rock. Adenosine 5'-triphosphate (ATP) luminometry, a tool available to the RST, revealed ATP amounts above background noise, i.e., 278-876 Relative Luminosity Units (RLUs) in only 6 cores, whereas organic carbon was detected in all cores. Our manned vs. remote observations based on automated acquisitions during the project provide insights for the preparation of future astrobiology-driven Mars missions. PMID:19105754

  1. Tolerance to cadmium in Chlamydomonas sp. (Chlorophyta) strains isolated from an extreme acidic environment, the Tinto River (SW, Spain).

    PubMed

    Aguilera, Angeles; Amils, Ricardo

    2005-11-30

    The effects of selected concentrations of Cd on the growth and ultrastructure of three strains of Chlamydomonas sp. isolated from a highly acidic river, Ro Tinto (SW Spain) were examined. The river is characterized by its extreme physico-chemical conditions in terms of low pH, mean 2.2 and high concentrations of heavy metals. Growth, Cd accumulation, chlorophyll a, influence of Fe in Cd toxicity and ultrastructural localization were determined. The strains were cultured in both, artificial chemically defined media as well as in natural water from the river. Since iron is the main component of the river water, the effect of different concentrations of this element in relation with Cd toxicity was also analysed. The three strains analysed showed comparable growth and ultrastructural changes. Cd concentration corresponding to 50% growth inhibition (EC50) was 0.2 mM when cells were grown in artificial media. When cells were grown in natural water, no significant differences were found between the controls and the Cd supplemented media even at the highest concentration of 0.8 mM. At an inhibitory level of 0.1 mM of Cd, increasing the concentration of iron up to 90 or 180 mM resulted in a dramatic recovery in algal growth rates in artificial media, reaching normal growth curves. The accumulation of Cd depended on dose and time in the artificial media. The maximal accumulation of Cd was reached after 3 days for all Cd doses, and remained almost unchanged in the subsequent period of time. Chlorophyll a amount depended on dose but not on time in the artificial growth media. At the ultrastructural level, an increase in the periplasmalemmal space was observed due to the presence of a large number of vacuoles, together with a decrease in the relative volume of the nucleus when the cells were incubated in the presence of Cd. Pyrenoid and starch granules were observed and accumulation of spherical electron-dense bodies were also detected. X-ray spectra of these bodies for cells growing in artificial acid media showed intense C, O and Cd signals. In addition to these peaks, a strong Fe signal was also observed when cells were grown in natural acidic water. PMID:16225936

  2. Some ecological mechanisms to generate habitability in planetary subsurface areas by chemolithotrophic communities: the Ro Tinto subsurface ecosystem as a model system.

    PubMed

    Fernndez-Remolar, David C; Gmez, Felipe; Prieto-Ballesteros, Olga; Schelble, Rachel T; Rodrguez, Nuria; Amils, Ricardo

    2008-02-01

    Chemolithotrophic communities that colonize subsurface habitats have great relevance for the astrobiological exploration of our Solar System. We hypothesize that the chemical and thermal stabilization of an environment through microbial activity could make a given planetary region habitable. The MARTE project ground-truth drilling campaigns that sampled cryptic subsurface microbial communities in the basement of the Ro Tinto headwaters have shown that acidic surficial habitats are the result of the microbial oxidation of pyritic ores. The oxidation process is exothermic and releases heat under both aerobic and anaerobic conditions. These microbial communities can maintain the subsurface habitat temperature through storage heat if the subsurface temperature does not exceed their maximum growth temperature. In the acidic solutions of the Ro Tinto, ferric iron acts as an effective buffer for controlling water pH. Under anaerobic conditions, ferric iron is the oxidant used by microbes to decompose pyrite through the production of sulfate, ferrous iron, and protons. The integration between the physical and chemical processes mediated by microorganisms with those driven by the local geology and hydrology have led us to hypothesize that thermal and chemical regulation mechanisms exist in this environment and that these homeostatic mechanisms could play an essential role in creating habitable areas for other types of microorganisms. Therefore, searching for the physicochemical expression of extinct and extant homeostatic mechanisms through physical and chemical anomalies in the Mars crust (i.e., local thermal gradient or high concentration of unusual products such as ferric sulfates precipitated out from acidic solutions produced by hypothetical microbial communities) could be a first step in the search for biological traces of a putative extant or extinct Mars biosphere. PMID:18237256

  3. The 2005 MARTE Robotic Drilling Experiment in Ro Tinto, Spain: objectives, approach, and results of a simulated mission to search for life in the Martian subsurface.

    PubMed

    Stoker, Carol R; Cannon, Howard N; Dunagan, Stephen E; Lemke, Lawrence G; Glass, Brian J; Miller, David; Gomez-Elvira, Javier; Davis, Kiel; Zavaleta, Jhony; Winterholler, Alois; Roman, Matt; Rodriguez-Manfredi, Jose Antonio; Bonaccorsi, Rosalba; Bell, Mary Sue; Brown, Adrian; Battler, Melissa; Chen, Bin; Cooper, George; Davidson, Mark; Fernndez-Remolar, David; Gonzales-Pastor, Eduardo; Heldmann, Jennifer L; Martnez-Fras, Jesus; Parro, Victor; Prieto-Ballesteros, Olga; Sutter, Brad; Schuerger, Andrew C; Schutt, John; Rull, Fernando

    2008-10-01

    The Mars Astrobiology Research and Technology Experiment (MARTE) simulated a robotic drilling mission to search for subsurface life on Mars. The drill site was on Pea de Hierro near the headwaters of the Ro Tinto river (southwest Spain), on a deposit that includes massive sulfides and their gossanized remains that resemble some iron and sulfur minerals found on Mars. The mission used a fluidless, 10-axis, autonomous coring drill mounted on a simulated lander. Cores were faced; then instruments collected color wide-angle context images, color microscopic images, visible-near infrared point spectra, and (lower resolution) visible-near infrared hyperspectral images. Cores were then stored for further processing or ejected. A borehole inspection system collected panoramic imaging and Raman spectra of borehole walls. Life detection was performed on full cores with an adenosine triphosphate luciferin-luciferase bioluminescence assay and on crushed core sections with SOLID2, an antibody array-based instrument. Two remotely located science teams analyzed the remote sensing data and chose subsample locations. In 30 days of operation, the drill penetrated to 6 m and collected 21 cores. Biosignatures were detected in 12 of 15 samples analyzed by SOLID2. Science teams correctly interpreted the nature of the deposits drilled as compared to the ground truth. This experiment shows that drilling to search for subsurface life on Mars is technically feasible and scientifically rewarding. PMID:19032053

  4. Visible-near infrared point spectrometry of drill core samples from Ro Tinto, Spain: results from the 2005 Mars Astrobiology Research and Technology Experiment (MARTE) drilling exercise.

    PubMed

    Sutter, Brad; Brown, Adrian J; Stoker, Carol R

    2008-10-01

    Sampling of subsurface rock may be required to detect evidence of past biological activity on Mars. The Mars Astrobiology Research and Technology Experiment (MARTE) utilized the Ro Tinto region, Spain, as a Mars analog site to test dry drilling technologies specific to Mars that retrieve subsurface rock for biological analysis. This work examines the usefulness of visible-near infrared (VNIR) (450-1000 nm) point spectrometry to characterize ferric iron minerals in core material retrieved during a simulated Mars drilling mission. VNIR spectrometry can indicate the presence of aqueously precipitated ferric iron minerals and, thus, determine whether biological analysis of retrieved rock is warranted. Core spectra obtained during the mission with T1 (893-897 nm) and T2 (644-652 nm) features indicate goethite-dominated samples, while relatively lower wavelength T1 (832-880 nm) features indicate hematite. Hematite/goethite molar ratios varied from 0 to 1.4, and within the 880-898 nm range, T1 features were used to estimate hematite/goethite molar ratios. Post-mission X-ray analysis detected phyllosilicates, which indicates that examining beyond the VNIR (e.g., shortwave infrared, 1000-2500 nm) will enhance the detection of other minerals formed by aqueous processes. Despite the limited spectral range of VNIR point spectrometry utilized in the MARTE Mars drilling simulation project, ferric iron minerals could be identified in retrieved core material, and their distribution served to direct core subsampling for biological analysis. PMID:19105759

  5. Quantification of Tinto River sediment microbial communities: importance of sulfate-reducing bacteria and their role in attenuating acid mine drainage.

    PubMed

    Snchez-Andrea, Irene; Knittel, Katrin; Amann, Rudolf; Amils, Ricardo; Sanz, Jos Luis

    2012-07-01

    Tinto River (Huelva, Spain) is a natural acidic rock drainage (ARD) environment produced by the bio-oxidation of metallic sulfides from the Iberian Pyritic Belt. This study quantified the abundance of diverse microbial populations inhabiting ARD-related sediments from two physicochemically contrasting sampling sites (SN and JL dams). Depth profiles of total cell numbers differed greatly between the two sites yet were consistent in decreasing sharply at greater depths. Although catalyzed reporter deposition fluorescence in situ hybridization with domain-specific probes showed that Bacteria (>98%) dominated over Archaea (<2%) at both sites, important differences were detected at the class and genus levels, reflecting differences in pH, redox potential, and heavy metal concentrations. At SN, where the pH and redox potential are similar to that of the water column (pH 2.5 and +400 mV), the most abundant organisms were identified as iron-reducing bacteria: Acidithiobacillus spp. and Acidiphilium spp., probably related to the higher iron solubility at low pH. At the JL dam, characterized by a banded sediment with higher pH (4.2 to 6.2), more reducing redox potential (-210 mV to 50 mV), and a lower solubility of iron, members of sulfate-reducing genera Syntrophobacter, Desulfosporosinus, and Desulfurella were dominant. The latter was quantified with a newly designed CARD-FISH probe. In layers where sulfate-reducing bacteria were abundant, pH was higher and redox potential and levels of dissolved metals and iron were lower. These results suggest that the attenuation of ARD characteristics is biologically driven by sulfate reducers and the consequent precipitation of metals and iron as sulfides. PMID:22544246

  6. Aseptically Sampled Organics in Subsurface Rocks From the Mars Analog Rio Tinto Experiment: An Analog For The Search for Deep Subsurface Life on Mars.}

    NASA Astrophysics Data System (ADS)

    Bonaccorsi, R.; Stoker, C. R.

    2005-12-01

    The subsurface is the key environment for searching for life on planets lacking surface life. Subsurface ecosystems are of great relevance to astrobiology including the search for past/present life on Mars. The surface of Mars has conditions preventing current life but the subsurface might preserve organics and even host some life [1]. The Mars-Analog-Rio-Tinto-Experiment (MARTE) is performing a simulation of a Mars drilling experiment. This comprises conventional and robotic drilling of cores in a volcanically-hosted-massive-pyrite deposit [2] from the Iberian Pyritic Belt (IBP) and life detection experiments applying anti-contamination protocols (e.g., ATP Luminometry assay). The RT is considered an important analog of the Sinus Meridiani site on Mars and an ideal model analog for a deep subsurface Martian environment. Former results from MARTE suggest the existence of a relatively complex subsurface life including aerobic and anaerobic chemoautotrophs and strict anaerobic methanogens sustained by Fe and S minerals in anoxic conditions. A key requirement for the analysis of a subsurface sample on Mars is a set of simple tests that can help determine if the sample contains organic material of biological origin, and its potential for retaining definitive biosignatures. We report here on the presence of bulk organic matter Corg (0.03-0.05 Wt%), and Ntot (0.01-0.04 Wt%) and amount of measured ATP (Lightning MVP, Biocontrol) in weathered rocks (tuffs, gossan, pyrite stockwork from Borehole #8; >166m). This provides key insight on the type of trophic system sustaining the subsurface biosphere (i.e., heterotrophs vs. autotrophs) at RT. ATP data (Relative-Luminosity-Units, RLU) provide information on possible contamination and distribution of viable biomass with core depth (BH#8, and BH#7, ~3m). Avg. 153 RLU, i.e., surface vs. center of core, suggest that cleaness/sterility can be maintained when using a simple sterile protocol under field conditions. Results from this research will support future drilling mission planned on Mars. [1] Boston, P.J., et al., 1992. Icarus 95,300-308; [2] Leistel et al., 1998.

  7. 76 FR 80430 - Rio Tinto plc and Rio Tinto Limited; Notice of Application

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-12-23

    ...service. Hearing requests should state the nature of the writer's interest, the reason...its officers and directors; (d) the nature of its present assets; and (e) the...management and treasury policies. d. Nature of Assets. Applicants state that...

  8. TRATAMIENTO POSTCOSECHA DE UVA DE VINIFICACIN CON RADIACIN UVC PARA OBTENCIN DE VINOS ENRIQUECIDOS EN RESVERATROL

    Microsoft Academic Search

    E. E. Cantos; R. F. Guerrero; B. Puertas; M. J. Jimnez; M. S. Jurado

    2007-01-01

    Wine grapes postharvest UVC treatment increases bioactive stilbene content, mainly resveratrol, in grapes. The induction capacity is variable and contingent on many factors. After UVC irradiation and three days of storage (Dm), Jan tinto variety showed the highest estilbene content (9.94 mg\\/Kg), this variety has shown to have the greatest and fastest resveratrol induction potential among all autochthonous varieties tested.

  9. ParaSITE

    E-print Network

    Rakowitz, Michael

    1998-01-01

    paraSITE proposes the appropriation of exterior ventilation systems on existing architecture to inflate pneumatic shelters that are designed for homeless people. This project involves the production of a series of inflatable ...

  10. Con il contributo della Compagnia di San Paolo Graduate Conference

    E-print Network

    Segatti, Antonio

    e Reggio Emilia) Gaslighting: The Case of Epistemic Oppression 11-11.30 Coffee Break: Aula Leoni 11'Doherty (University of South Wales/Universit di Milano) Piet Goemans (FINO/Universit di Pavia) Political Liberalism

  11. TESIS DOCTORAL NEGACION CONSTRUCTIVA PARA

    E-print Network

    Alpuente, María

    TESIS DOCTORAL NEGACION CONSTRUCTIVA PARA PROGRAMACION LOGICA-ECUACIONAL Memoria presentada por Mar CONSTRUCTIVA PARA PROGRAMACION LOGICA-ECUACIONAL Tesis Doctoral en Inform#19;atica presentada por Mar#19;#16;a

  12. AYUDA PARA INVIDENTES UTILIZANDO TELEFONOS

    E-print Network

    Autonoma de Madrid, Universidad

    ´on, aplicaci´on para m´oviles, c´odigo, base de da- tos,dpi (puntos por pulgada, dots per inch),layout,GPS. III la UAM. #12;Resumen Resumen El proyecto desarrolla aplicaciones para ayuda a invidentes utlizando tel´efonos inteligentes. La aplicaci´on principal est´a desarrollada para aparatos Android. Tiene como objetivo ayudar

  13. Tomografa computarizada (TC) y exploraciones para cncer

    Cancer.gov

    Hoja informativa que describe el procedimiento y la tecnologa de exploraciones con tomografa computarizada as como sus usos para el diagnstico, para exmenes de deteccin y para tratamiento del cncer.

  14. Pruebas genticas para sndromes hereditarios de cncer

    Cancer.gov

    Hoja informativa sobre pruebas genticas para riesgos heredados de cncer; incluye tipos de pruebas, para quin estn indicadas y explicacin y confidencialidad de los resultados. Ofrece informacin de pruebas genticas a domicilio o pruebas para el consumidor.

  15. Separating para and ortho water.

    PubMed

    Horke, Daniel A; Chang, Yuan-Pin; D?ugo??cki, Karol; Kpper, Jochen

    2014-10-27

    Water exists as two nuclear-spin isomers, para and ortho, determined by the overall spin of its two hydrogen nuclei. For isolated water molecules, the conversion between these isomers is forbidden and they act as different molecular species. Yet, these species are not readily separated, and no pure para sample has been produced. Accordingly, little is known about their specific physical and chemical properties, conversion mechanisms, or interactions. The production of isolated samples of both spin isomers is demonstrated in pure beams of para and ortho water in their respective absolute ground state. These single-quantum-state samples are ideal targets for unraveling spin-conversion mechanisms, for precision spectroscopy and fundamental symmetry-breaking studies, and for spin-enhanced applications, for example laboratory astrophysics and astrochemistry or hypersensitized NMR experiments. PMID:25196938

  16. SEGURIDAD ENERGETICASEGURIDAD ENERGETICA UN DESAFIO PARA CHILEUN DESAFIO PARA CHILE

    E-print Network

    Catholic University of Chile (Universidad Catlica de Chile)

    Universidad Catlica de Chile Departamento de Ingeniera Elctrica Hugh Rudnick 24 Noviembre 2006 #12;2 Tabla Producto Geogrfico Bruto versus Consumo Energtico (Fuente: CNE y Banco Central) Desarrollo econmico y con petrleo a EEUU en relacin a Israel el ao 1970 Venezuela utilizando energa para influir en

  17. Compatibilidad con audfonos para sordos

    E-print Network

    Greenberg, Albert

    Compatibilidad con audfonos para sordos Hearing Aid Compatibility Q&A Q. What does hearing aid the different features of the phone thoroughly and in different locations, using your hearing aid or cochlear implant, to determine if you hear any interfering noise. Consult a sales representative about phone return

  18. Prmio para trs novas aplicaes

    E-print Network

    Instituto de Sistemas e Robotica

    Prémio para três novas aplicações Tecnologia. A "wiride" venceu o "Lisbon Big Apps", concurso de Instituto Superior Técnico que desenvolveu o projeto, citada pelo/dAT, a "wiride" é uma nova forma de andar

  19. Estudios ALCHEMIST para el cncer de pulmn

    Cancer.gov

    Conjunto de informacin sobre los estudios ALCHEMIST para el cncer de pulmn, los cuales examinarn los tejidos de tumores de pacientes con cncer de pulmn en estadio inicial para detectar mutaciones genticas en genes EGFR y ALK.

  20. Presidncia da Repblica Subchefia para Assuntos Jurdicos

    E-print Network

    Paran, Universidade Federal do

    credenciamento e recredenciamento de instituies de educao superior; II - homologar os instrumentos de necessrias; III - propor ao CNE diretrizes para a elaborao, pelo INEP, dos instrumentos de avaliao para credenciamento de instituies; IV - estabelecer diretrizes para a elaborao, pelo INEP, dos instrumentos de

  1. Tutorial para rellenar el formulario de expediente de personal y cargos TUTORIAL PARA RELLENAR EL

    E-print Network

    Escolano, Francisco

    Tutorial para rellenar el formulario de expediente de personal y cargos TUTORIAL PARA RELLENAR EL EXPEDIENTE ESPACIAL DE PERSONAS Y CARGOS Objetivo del tutorial: Explicar paso a paso el procedimiento para ubicadas. En este tutorial aprender a: Seleccionar mapas de los edificios para imprimir Comprobar los

  2. Fundo Global para o Meio Ambiente

    E-print Network

    #12;#12;Fundo Global para o Meio Ambiente Global Environment Facility Avaliao dos Recursos de Climticos Center for Weather Forecasts and Climate Studies Programa das Naes Unidas para o Meio Ambiente Fernando Ramos Martins Samuel Luna de Abreu Ricardo Rther Realizao Diviso de Clima e Meio Ambiente

  3. Ciudades inteligentes: beneficios para la inclusin social

    E-print Network

    Escolano, Francisco

    Ciudades inteligentes: beneficios para la inclusin social http://www.iuii.ua.es/CatedraTelefonicaUA/smart-cities Universidad de Alicante Inscripcin gratuita a travs del formulario http://www.iuii.ua.es/smart-cities trasladar los conceptos de Smart City al mbito de la Universidad para lograr el objetivo de mejora de la

  4. AMPUTAZIONI DELL'ARTO SUPERIORE: IL CONTRIBUTO DALLA PSICOLOGIA ED IL RUOLO DELLO PSICOLOGO

    Microsoft Academic Search

    D. PAJARDI; G. PAJARDI; U. MARTORANA

    SUMMARY The professional help in a situation such as trauma of the hand, even more when the outcome is amputation, requires that the medical staff must consider the variety and complexity of the patient's different needs; not only surgical and rehabilitative needs but also psychological ones that overlook the person's individual and social spheres. A serious trau- ma to the

  5. PROGRAMA JOVENS TALENTOS PARA A CINCIA

    E-print Network

    Lucero, Jorge Carlos

    Relações Exteriores para estrangeiros; a Carteira de Trabalho e Previdência Social; o Certificado de: máquinas calculadoras, agendas eletrônicas ou similares, telefones celulares, smartphones, tablets, ipod

  6. Consejos para pacientes que reciben quimioterapia

    Cancer.gov

    Serie de dieciocho (18) hojas sobre los efectos secundarios de la quimioterapia. Cada hoja contiene recomendaciones y sugerencias prcticas para ayudarle a controlar los efectos secundarios durante la quimioterapia, y a que se sienta mejor durante el tratamiento.

  7. Consejos para pacientes que reciben radioterapia

    Cancer.gov

    Serie de nueve (9) hojas sobre los efectos secundarios de la radioterapia. Cada hoja contiene recomendaciones y sugerencias prcticas para ayudarle a controlar los efectos secundarios durante la radioterapia, y a que se sienta mejor durante el tratamiento.

  8. Software Libre para ensear o aprender Matemtica

    E-print Network

    De Nápoli, Pablo Luis

    Software Libre para enseñar o aprender Matemática Porqué y Cómo Pablo De Nápoli pdenapo@dm.uba.ar #12;Introducción · En esta charla, presentaremos algunos de los pogramas que son software libre, que ventajas de utilizar software libre para la docencia y la investigación en matemática. #12;¿Por qué

  9. Tecnologa para todos Sistema Inalmbrico de Rice

    E-print Network

    Tecnología para todos Sistema Inalámbrico de Rice Andrea Trevino Rice University http://www.techforall.org/tfa_wireless.html http://tfa.rice.edu #12;Por qué en Pecan Park? La Misión de TFA: Proporcionar conocimientos a la comunidad. El propósito de Rice: Usar este programa para explorar la siguiente generación del sistema

  10. The ParaScope parallel programming environment

    NASA Technical Reports Server (NTRS)

    Cooper, Keith D.; Hall, Mary W.; Hood, Robert T.; Kennedy, Ken; Mckinley, Kathryn S.; Mellor-Crummey, John M.; Torczon, Linda; Warren, Scott K.

    1993-01-01

    The ParaScope parallel programming environment, developed to support scientific programming of shared-memory multiprocessors, includes a collection of tools that use global program analysis to help users develop and debug parallel programs. This paper focuses on ParaScope's compilation system, its parallel program editor, and its parallel debugging system. The compilation system extends the traditional single-procedure compiler by providing a mechanism for managing the compilation of complete programs. Thus, ParaScope can support both traditional single-procedure optimization and optimization across procedure boundaries. The ParaScope editor brings both compiler analysis and user expertise to bear on program parallelization. It assists the knowledgeable user by displaying and managing analysis and by providing a variety of interactive program transformations that are effective in exposing parallelism. The debugging system detects and reports timing-dependent errors, called data races, in execution of parallel programs. The system combines static analysis, program instrumentation, and run-time reporting to provide a mechanical system for isolating errors in parallel program executions. Finally, we describe a new project to extend ParaScope to support programming in FORTRAN D, a machine-independent parallel programming language intended for use with both distributed-memory and shared-memory parallel computers.

  11. PREPARE UN EQUIPO PORTTIL PARA EMERGENCIAS Prepare un equipo portatil para emergencias de modo que pueda

    E-print Network

    libre) 2. Equipos medicos caseros (ejemplos: medidor de glucosa, monitor de presion arterial, bastonPREPARE UN EQUIPO PORTÁTIL PARA EMERGENCIAS Prepare un equipo portatil para emergencias de modo que llevar el equipo. Incluya los siguientes artículos en el equipo: 1. Medicamentos (recetados y de venta

  12. MTODOS PARA DETERMINAO DA DENSIDADE BSICA DE CAVACOS PARA CONFERAS E FOLHOSAS

    Microsoft Academic Search

    Celso Edmundo; Bochetti Foelkel; Maria Aparecida Mouro Brasil; Luiz Ernesto; George Barrichelo

    1 - INTRODUO A densidade da madeira uma caracterstica complexa resultante da combinao de diversos fatres. Existem inmeros trabalhos mostrando sua relao com as dimenses das fibras, particularmente espessura da parede, volume dos vasos e parnquimas, proporo entre madeira primaveril e outonal, e arranjo dos elementos anatmicos. ste assunto tem sido intensivamente estudado para as conferas, porm para as

  13. PROJECTO LEXNET OLHA PARA AS REDES WIRELESS

    E-print Network

    Instituto de Sistemas e Robotica

    PROJECTO LEXNET OLHA PARA AS REDES WIRELESS As radiaes provocadas pelas redes sem fios esto. PAG. 6 #12;Radiaes das redes wireless debaixo de olho O projecto europeu Lexnet tem como objectivo redes de comunicaes mveis, GSM, Wi-Fi, r- dio, sem comprometer a qualidade dos ser- vios. Tendo

  14. Smartphones para cegos Uma inveno portuguesa

    E-print Network

    Instituto de Sistemas e Robotica

    Smartphones para cegos Uma invenção portuguesa Usar um ecrã tátil de forma discreta, sem recurso ao mentores do projeto. O Holi?raille é uma espécie de capa, acoplável à parte de trás de um smartphone e que

  15. Cartilha para Legalizao de Casas Religiosas

    E-print Network

    Cartilha para Legalizao de Casas Religiosas de Matriz Africana #12;2 Rio de Janeiro, 30 de maio Secretaria Estadual de Assistncia Social e Direitos Humanos do Rio de Janeiro. NIREMA: Ncleo Social e Direitos Humanos do Rio de Janeiro Coordenador Geral Prof. Adriano Pilatti Centro de Cincias

  16. As prticas pedaggicas contra a excluso escolar no Movimento da Escola Moderna

    Microsoft Academic Search

    Srgio Niza

    A nossa Sociedade de Cincias da Educao convidou-nos neste IX congresso a que tornemos visvel como a questo do sucesso educativo tem estado no cerne das preocupaes da Sociedade, de modo a fazermos prova do propsito de intervir socialmente, com os contributos aqui reunidos, para que se compreenda melhor a razo de tanto insucesso e se possa promover mais sucesso

  17. Semntica Operacional para la Programacin en Lgica

    E-print Network

    Simari, Guillermo R.

    sustitucin tal que (A) = A Def: Sean ={ [U1, s1], ..., [Um, sm] } y = { [V1, t1], ..., [Vn, tn] } sendas sustituciones, tales que Ui Vj y Ui no aparece en tj, para todo par i, j tal que 1 i m y 1 j n. Entonces(S) ], [Y, a], [Z, T] }{ [S,W], [T, b]}= {[X, f(W)], [Y, a], [Z, b], [S,W], [T, b]} Def: Sean ={ [U1, s1

  18. Semntica Operacional para la Programacin en Lgica

    E-print Network

    Simari, Guillermo R.

    (A) = A Def: Sean ={ [U1, s1], ..., [Um, sm] } y = { [V1, t1], ..., [Vn, tn] } sendas sustituciones, tales que Ui Vj y Ui no aparece en tj, para todo par i, j tal que 1 i m y 1 j n. Entonces, definimos la, T] }{ [S,W], [T, b]}= {[X, f(W)], [Y, a], [Z, b], [S,W], [T, b]} Def: Sean ={ [U1, s1], ..., [Um

  19. Ortho-Para Hydrogen Ratiometer Design

    Microsoft Academic Search

    D. Zhou; N. S. Sullivan

    2006-01-01

    The design and performance of a thermal conductivity gauge to measure the ratio of ortho- to para-hydrogen content is reported. The gauge employs an ultra-thin film as heater and sensor. This ratiometer has a nearly pressure-independent thermal conductivity response over a broad pressure range. The thermal conductivity of hydrogen gas and nitrogen gas have been measured and found qualitatively correct.

  20. Para-hydrogen perspectives in hyperpolarized NMR.

    PubMed

    Glggler, Stefan; Colell, Johannes; Appelt, Stephan

    2013-10-01

    The first instance of para-hydrogen induced polarization (PHIP) in an NMR experiment was serendipitously observed in the 1980s while investigating a hydrogenation reaction (Seldler et al., 1983; Bowers and Weitekamp, 1986, 1987; Eisenschmid et al., 1987) [1-4]. Remarkably a theoretical investigation of the applicability of para-hydrogen as a hyperpolarization agent was being performed in the 1980's thereby quickly providing a theoretical basis for the PHIP-effect (Bowers and Weitekamp, 1986) [2]. The discovery of signal amplification by a non-hydrogenating interaction with para-hydrogen has recently extended the interest to exploit the PHIP effect, as it enables investigation of compounds without structural alteration while retaining the advantages of spectroscopy with hyperpolarized compounds [5]. In this article we will place more emphasis of the future applications of the method while only briefly discussing the efforts that have been made in the understanding of the phenomenon and the development of the method so far. PMID:23932399

  1. TELEMEDICINA: UN DESAFO PARA AMRICA LATINA

    PubMed Central

    Litewka, Sergio

    2011-01-01

    La telemedicina es una tendencia creciente en la prestacin de los servicios mdicos. Aunque la eficacia de esta prctica no ha estado bien establecida, es probable que los pases en desarrollo compartirn este nuevo paradigma con los desarrollados. Los defensores de la telemedicina en Amrica Latina sostienen que ser una herramienta til para reducir las disparidades y mejorar la accesibilidad de atencin de salud. Aunque Amrica Latina quiz se convierta en un lugar para la investigacin e investigacin de estos procedimientos, no est claro cmo la telemedicina podra contribuir a mejorar la accesibilidad para las poblaciones desfavorecidas, o coexistir con sistemas de atencin de salud pblicos crnicamente enfermos. Telemedicine is a growing trend in the provision of medical services. Although the effectiveness of this practice has not been well established, it is likely that developing countries will share this new paradigm with developed ones. Supporters of telemedicine in Latin America maintain that it will be a useful tool for reducing disparities and improving health care accessibility. Although Latin America might become a place for research and investigation of these procedures, it is not clear how telemedicine could contribute to improving accessibility for disadvantaged populations, or coexist with chronically ill-funded public healthcare systems. PMID:21625326

  2. BECAS DE MASTER PARA DESARROLLAR TRABAJOS DE INVESTIGACIN EN EL

    E-print Network

    Fraguela, Basilio B.

    10 becas para realizar masters para estudiantes de cualquier nacionalidad que sean admitidos en las.alvarez@co.ieo.es Biodiversidad y Actividad Microbiana del Ecosistema Pelgico Profundo en el Atlntico Norte Marta M. Varela

  3. Centro para la Salud Mundial (CGH) del NCI

    Cancer.gov

    El Centro para la Salud Mundial (CGH) del Instituto Nacional del Cncer coordina actividades de investigacin y trabaja con socios nacionales e internacionales para comprender y enfrentar la carga que representa el cncer a nivel mundial.

  4. Planificacin para la etapa final de la vida

    Cancer.gov

    Informacin para pacientes, sus familiares y amigos sobre el cuidado del paciente terminal, la planificacin para el final de la vida, y la afliccin, el duelo y manejo de la prdida de un ser querido.

  5. Searching for an Acidic Aquifer in the Rio Tinto Basin: First Geobiology Results of MARTE Project

    NASA Technical Reports Server (NTRS)

    Fernandez-Remolar, D. C.; Prieto-Ballesteros, O.; Stoker, C.

    2004-01-01

    Among the conceivable modern habitats to be explored for searching life on Mars are those potentially developed underground. Subsurface habitats are currently environments that, under certain physicochemical circumstances, have high thermal and hydrochemical stability [1, 2]. In planets like Mars lacking an atmospheric shield, such systems are obviously protected against radiation, which strongly alters the structure of biological macromolecules. Low porosity but fractured aquifers currently emplaced inside ancient volcano/sedimentary and hydrothermal systems act as excellent habitats [3] due to its thermal and geochemical properties. In these aquifers the temperature is controlled by a thermal balance between conduction and advection processes, which are driven by the rock composition, geological structure, water turnover of aquifers and heat generation from geothermal processes or chemical reactions [4]. Moreover, microbial communities based on chemolithotrophy can obtain energy by the oxidation of metallic ores that are currently associated to these environments. Such a community core may sustain a trophic web composed of non-autotrophic forms like heterotrophic bacteria, fungi and protozoa.

  6. Characterisation of sequential leachate discharges of mining waste rock dumps in the Tinto and Odiel rivers

    Microsoft Academic Search

    A. Sinz; J. A. Grande; M. L. de la Torre; D. Snchez-Rodas

    2002-01-01

    Mining waste rock dumps (WRDs) are potential sources of pollution, which after rainfall produce leachate discharges, loaded with acid mining drainage (AMD). The discharges generally occur in two phases: initial rapid leaching over a period of 17 days, followed by a period of variable duration during which leaching decelerates. The relative preponderance of each phase depends on the characteristics of

  7. Gua para la Evaluacin de Riesgo Ambiental de Organismos

    E-print Network

    Parrott, Wayne

    Gua para la Evaluacin de Riesgo Ambiental de Organismos Genticamente Modificados #12;#12;Gua para la Evaluacin de Riesgo Ambiental de Organismos Genticamente Modificados #12;APOYO: 2012 ILSI) Guia para la evaluacin de riesgo ambiental de organismos genticamente midificados / [editores] Paulo

  8. Guia para a Avaliao do Risco Ambiental de Organismos

    E-print Network

    Parrott, Wayne

    Guia para a Avaliao do Risco Ambiental de Organismos Geneticamente Modificados 1 Edio, So Paulo - ILSI Brasil 2012 #12;#12;Guia para a Avaliao do Risco Ambiental de Organismos Geneticamente para a Avaliao do Risco Ambiental de Organismos Geneticamente Modificados / [editores] Paulo Paes de

  9. Protocolo de Espacios. Tutorial de estancias TUTORIAL PARA RELLENAR EL

    E-print Network

    Escolano, Francisco

    Protocolo de Espacios. Tutorial de estancias TUTORIAL PARA RELLENAR EL EXPEDIENTE ESPACIAL DE ESTANCIAS Objetivo del tutorial: Explicar paso a paso el procedimiento para realizar el expediente de estancias En este tutorial aprender a: Seleccionar mapas de los edificios para imprimir Comprobar los

  10. Technological Foresight - Um instrumento para poltica cientfica e tecnolgica1

    Microsoft Academic Search

    MAURO ZACKIEWICZ; SRGIO SALLES-FILHO

    Este texto tem por objetivo apresentar a abordagem de technological foresight2, crescentemente utilizada em vrios pases como instrumento para a alocao de fundos pblicos de C&T, para definio de priorida- des de pesquisa e para melhorar a articulao das organizaes de pes- quisa com as redes de inovao e o setor produtivo. So discutidas suas bases tericas, suas principais caractersticas

  11. Control del dolor: Apoyo para las personas con cncer

    Cancer.gov

    Contiene informacin sobre las medicinas contra el dolor para pacientes con cncer, los planes para controlarlo, cmo hablar con su equipo de atencin mdica sobre el dolor que usted siente y qu hacer para controlar los efectos fsicos y emocionales del mismo.

  12. Publicaciones IFMBE - Instrucciones para los Autores en la Preparacin de Artculos para el IV Congreso Latinoamericano de Ingeniera Biomdica

    Microsoft Academic Search

    A. B. Firstauthor; C. Coauthor

    Este modelo presenta las instrucciones para la preparacin de artculos para el CLAIB2007, basado en la serie de publicaciones del IFMBE. El mismo pretende guiar a los autores en la preparacin de la versin electrnica de sus artculos. Solamente los artculos que respeten este modelo sern considerados para aceptacin y publicacin en los Ana- les del evento. El Abstract debe

  13. Semana nacional de preparacin para clima severo 2 al 8 de marzo de Manual para las redes sociales

    E-print Network

    clima severo en las redes sociales. Prepararse para clima severo va ms all de proteger a su familiaSemana nacional de preparacin para clima severo 2 al 8 de marzo de 2014 Manual para las redes sociales Usted, tambin, puede ser como una fuerza de la naturaleza en su comunidad ayudando a la Agencia

  14. Producing and quantifying enriched para-H2

    NASA Astrophysics Data System (ADS)

    Tom, Brian A.; Bhasker, Siddhartha; Miyamoto, Yuki; Momose, Takamasa; McCall, Benjamin J.

    2009-01-01

    The production of enriched para-H2 is useful for many scientific applications, but the technology for producing and measuring para-H2 is not yet widespread. In this note and in the accompanying auxiliary material, we describe the design, construction, and use of a versatile standalone converter that is capable of producing para-H2 enrichments of up to ?99.99% at continuous flow rates of up to 0.4 SLM. We also discuss para-H2 storage and back conversion rates, and improvements to three techniques (thermal conductance, NMR, and solid hydrogen impurity spectroscopy) used to quantify the para-H2 enrichment.

  15. Allergic contact dermatitis to para-phenylenediamine.

    PubMed

    Jenkins, David; Chow, Elizabeth T

    2015-02-01

    Exposure to hair dye is the most frequent route of sensitisation to para-phenylenediamine (PPD), a common contact allergen. International studies have examined the profile of PPD, but Australian-sourced information is lacking. Patients are often dissatisfied with advice to stop dyeing their hair. This study examines patients' characteristics, patch test results and outcomes of PPD allergy from a single Australian centre, through a retrospective analysis of patch test data from 2006 to 2013 at the Liverpool Hospital Dermatology Department. It reviews the science of hair dye allergy, examines alternative hair dyes and investigates strategies for hair dyeing. Of 584 patients, 11 were allergic to PPD. Our PPD allergy prevalence rate of 2% is at the lower end of international reported rates. About half these patients also react to para-toluenediamine (PTD). Affected patients experience a significant lifestyle disturbance. In all, 78% tried alternative hair dyes after the patch test diagnosis and more than half continued to dye their hair. Alternative non-PPD hair dyes are available but the marketplace can be confusing. Although some patients are able to tolerate alternative hair dyes, caution is needed as the risk of developing an allergy to other hair dye ingredients, especially PTD, is high. PMID:25302475

  16. Programas del NCI: Anlisis molecular para la eleccin de tratamientos (MATCH) y MATCH para pacientes infantiles

    Cancer.gov

    Informacin sobre el Programa de anlisis molecular para la eleccin de tratamientos (MATCH) del NCI, el cual asignar pacientes con tumores slidos y linfomas avanzados que hayan dejado de responder al tratamiento convencional a estudios clnicos de acuerdo con las anomalas genticas de sus tumores.

  17. Semana Nacional de Preparacin para Clima Severo 2014 Pgina 1 Plantilla para artculos de blog

    E-print Network

    amenaza de clima severo. El tornado categora EF-5 que azot a Moore, Oklahoma el 20 de mayo fue el supervivencia. Esto es especialmente importante ante la amenaza de clima severo. Se estima que el tornado. Visite weather.gov para obtener la informacin ms actualizada sobre las amenazas meteorolgicas. Tome

  18. Chapter 4: PARAS Microkernel at a Glance 1 PARAS Microkernel at a Glance

    E-print Network

    Melbourne, University of

    current ones) to manage its resources. To meet this requirement, we have developed an OS kernel called-of-the-art microkernel technology. It supports most essential services such as process, memory, and interprocess communication management. In the design of the PARAS microkernel, we have adopted the philosophy of migrating

  19. Controlling External Parasites CeCarter\\FactSheets\\ExParas.indd ExParas.pdf

    E-print Network

    New Hampshire, University of

    , or manure ­ or in wet areas such as a muddy area around a water tub. Good stable management practices canParas.pdf Revised 2009-11 by removing places where larva can grow. Drain any muddy areas; clean up any spilled feed is important. Make sure the shelter is kept clean, and consider adding a walk through barrier such as hanging

  20. Ms para ellas - Sugerencias para cerrar la brecha entre gneros en las regiones en desarrollo

    Microsoft Academic Search

    Alessandro Magnoli

    2005-01-01

    Segn el pensamiento convencional, la salud y la educacin son factores esenciales para el desarrollo econmico y social: permiten mejorar la distribucin del ingreso y la productividad, y adems, los ms beneficiados son los pobres. Sin embargo, en muchas regiones del mundo no todos los miembros de la sociedad reciben estos servicios equitativamente. En muchos casos las mujeres estn excluidas

  1. Potencial de las comarcas aragonesas para la localizacin industrial. Implicaciones para las autoridades pblicas

    Microsoft Academic Search

    Luca Isabel Garca Cebrin; Antonio Muoz Porcar

    2010-01-01

    RESUMEN Para que las empresas puedan desarrollar favorablemente sus actividades manufactureras, logsticas o de cualquier otra ndole, es necesario que el espacio fsico en el que se van a desarrollar disponga, de la infraestructura bsica que las organizaciones demandan y que afectan no slo al suelo industrial sino a las instalaciones que los propios polgonos les facilitan. El objetivo de

  2. PLAN ARGENTINA INNOVADORA 2020 Temas estratgicos para convocatorias 2014

    E-print Network

    Santos, Juan

    abiótico. Producción de germoplasma de calidad para diferentes usos/servicios ambientales. Productos por capa. Control bacteriano en fondo de pozo para la reducción de la producción de sulfhídrico componentes electrónicos y microelectrónicos. Sistemas de automatización y control para procesos industriales

  3. Ortho and Para Molecules of Water in Electric Field

    E-print Network

    S. N. Andreev; V. P. Makarov; V. I. Tikhonov; A. A. Volkov

    2007-03-04

    Stark effect is calculated by the perturbation theory method separately for the ortho and para water molecules. At room temperature, a 30%-difference in the energy change is found for the two species put in electric field. This implies a sorting of the ortho and para water molecules in non-uniform electric fields. The ortho/para water separation is suggested to occur in the course of steam sorption on a solid surface and of large-scale atmospheric processes.

  4. On Lightlike Geometry of Para-Sasakian Manifolds

    PubMed Central

    Acet, Bilal Eftal; K?l?, Erol

    2014-01-01

    We study lightlike hypersurfaces of para-Sasakian manifolds tangent to the characteristic vector field. In particular, we define invariant lightlike hypersurfaces and screen semi-invariant lightlike hypersurfaces, respectively, and give examples. Integrability conditions for the distributions on a screen semi-invariant lightlike hypersurface of para-Sasakian manifolds are investigated. We obtain a para-Sasakian structure on the leaves of an integrable distribution of a screen semi-invariant lightlike hypersurface. PMID:24892072

  5. Algoritmo genetico para la Descomposicion de Minkowski de poligonos convexos

    E-print Network

    Llanos, Diego R.

    Algoritmo gen´etico para la Descomposici´on de Minkowski de pol´igonos convexos Edilma O´i presentamos un algoritmo gen´etico para el problema. 1 Introducci´on En diversas disciplinas actuales como rob´i presentamos una propuesta usando Algoritmos Gen´eticos, para resolver el problema de la de- scomposici´on de

  6. Estrategias cognitivo-conductuales para el manejo del craving

    Microsoft Academic Search

    Ivn Gonzlez Salazar

    2004-01-01

    En el presente trabajo se revisaron los aspectos genera- les del craving y se destac su importancia para la adhe- rencia al tratamiento en adicciones. De igual manera se revisaron las diferentes estrategias cognitivo-conductua- les para el manejo del craving, las cuales incluan: detencin del pensamiento, tcnicas de distraccin, con- trol y programacin de actividades, entrenamiento en relajacin, tcnicas de

  7. Elementos para una estrategia de desarrollo industrial en el Per

    Microsoft Academic Search

    Rodolfo Cermeo

    1989-01-01

    El objetivo de este trabajo es discutir las propuestas de desarrollo industrial existentes para el caso peruano. Esta discusin se ha1la a la luz de las experiencias de industrializacin seguidas por los pases en desarrollo, a fin de identificar los elementos cruciales para el diseo de una estrategia de desarrollo industrial de largo plazo.

  8. JavaLog: Un Lenguaje para la Programacion de Agentes

    Microsoft Academic Search

    Alejandro Zunino; Luis Berdn; Anala Amandi

    2001-01-01

    Resumen La programacin de sistemas multi-agentes ha sido generalmente soportada por le nguajes orientados a objetos o lenguajes lgicos. Ambos paradigmas muestran poseer caractersticas para soportar parcialmente el desarrollo de agentes. Sin embargo, si ambos paradigmas son integrados, una solucin a la programacin de agentes aparece en forma evidente. En este artculo, un lenguaje multi-paradigma para la programacin de agentes

  9. Identificador : 987811692 IMPRESO SOLICITUD PARA VERIFICACIN DE TITULOS OFICIALES

    E-print Network

    Fraguela, Basilio B.

    UNIVERSIDAD SOLICITANTE CENTRO CDIGO CENTRO Universidad de A Corua Escuela Universitaria de Arquitectura A Corua RAMA DE CONOCIMIENTO Ingeniera y Arquitectura CONJUNTO CONVENIO No HABILITA PARA EL EJERCICIO DE ISCED 2 Ingeniera y Arquitectura Construccin e ingeniera civil Arquitectura y urbanismo HABILITA PARA

  10. Sistemas de Informao para a Web: Arquitecturas Aplicacionais

    E-print Network

    da Silva, Alberto Rodrigues

    1 Sistemas de Informao para a Web: Arquitecturas Aplicacionais Alberto Silva IST/INESC Rua Alves arquitecturas de sistemas de informao para a Web, designadamente baseadas em actividades computacionais (1. 1.1 Palavras-chave Web, Arquitecturas de Sistemas de Informao, SIW, CGI, SSI, Java, ORB. 2

  11. Uma Proposta de Modelo para Objetos de Aprendizagem

    Microsoft Academic Search

    Santos Rosa; Rogrio Avellar Cordeiro; Darcy Ribeiro

    Resumo. Algumas polticas pblicas tm impulsionado o desenvolvimento de material digital para uso como recurso no processo de ensino e aprendizagem, incentivando o surgimento de vrias equipes, cujos produtos desenvolvidos tendem a se concentrar em repositrios para que sejam acessveis ao pblicoalvo. Muitas vezes o entendim ento de quais elementos devem estar presentes num objeto varia entre as equipes, dificultando

  12. Mundos Virtuales para la Enseanza a travs de Internet

    Microsoft Academic Search

    Inmaculada Remolar; Miguel Chover; scar Belmonte; Cristina Rebollo; Celso Campos

    Resumen La aplicacin de los mundos virtuales para la docencia a travs de Internet hacen que el alumno pueda sumergirse en ambientes amigables que hacen ms ameno el aprendizaje. Este artculo presenta tres aplicaciones docentes desarrolladas en estos entornos. La primera de ellas, para la enseanza del vocabulario, muestra un conjunto de mundos virtuales diseados en VRML en los que

  13. Evolucin de Funciones de Densidad de Probabilidad para Optimizacin Continua

    E-print Network

    Casillas Barranquero, Jorge

    Evolución de Funciones de Densidad de Probabilidad para Optimización Continua Jorge Casillas y algoritmo está basado en la evolución de funciones de densidad de probabilidad para adaptarse a las zonas. Palabras clave -- optimización continua, funciones de densidad de probabilidad, estimación de

  14. Gua rpida para la solicitud de una accin Marie Curie

    E-print Network

    Escolano, Francisco

    Guía rápida para la solicitud de una acción Marie Curie Fellowship Subdirección General de ser considerado elegible para la solicitud de una Marie Curie Fellowship existen tres tipos de el proyecto Marie Curie a iniciar el doctorado. #12;¿Existen requisitos según mi nacionalidad? Las

  15. Reitor da Universidade de Lisboa reclama "medidas urgentes" para

    E-print Network

    Instituto de Sistemas e Robotica

    Reitor da Universidade de Lisboa reclama "medidas urgentes" para ensino superior António Cruz Serra pública, para que as universidades ganhem "mais autonomia administrativa e financeira" O novo reitor da Universidade de Lisboa (UL), resultante da fusão entre a Clássica e a Técnica, falou hoje na necessidade de

  16. Creciendo Juntos Plan de la Universidad de Columbia para

    E-print Network

    Hone, James

    reubicación y reconstrucción de utilidades para sustituir alcantarillado y tuberías de agua y otros servicios a un ya existente regulador del alcantarillado en la avenida 12th. Columbia adjudicó este contrato para

  17. Astronaut Walter Schirra during water egress para-drop training

    NASA Technical Reports Server (NTRS)

    1965-01-01

    Astronaut Walter M. Schirra Jr., the Gemini-Titan 3 backup crew command pilot, is shown during water egress para-drop training activity in nearby Galveston Bay (10171); Schirra is shown in the water with his parachute crumpling during water egress para-drop training (10172); Schirra is retrieved from Galveston Bay by divers during water egress training (10173).

  18. Cooling by Para-to-Ortho-Hydrogen Conversion

    NASA Technical Reports Server (NTRS)

    Sherman, A.; Nast, T.

    1983-01-01

    Catalyst speeds conversion, increasing capacity of solid hydrogen cooling system. In radial-flow catalytic converter, para-hydrogen is converted to equilibrium mixture of para-hydrogen and ortho-hydrogen as it passes through porous cylinder of catalyst. Addition of catalyst increases capacity of hydrogen sublimation cooling systems for radiation detectors.

  19. LA LECTURA PARA LOS PROFESIONALES UNIVERSITARIOS. REFLEXIONES METODOLGICAS

    Microsoft Academic Search

    Maritza Batista Batista

    2011-01-01

    La enseanza de las matemticas es actualmente de gran inters para los actores responsables del acto educativo, ya que los propsitos se entienden diferente para alumnos y profesores. Tal situacin ha llevado a los matemticos educativos y otros investigadores a indagar sobre las creencias y actitudes de estudiantes y docentes de matemticas y su influencia en el logro acadmico. Las

  20. Towards a double field theory on para-Hermitian manifolds

    SciTech Connect

    Vaisman, Izu [Department of Mathematics, University of Haifa, Haifa (Israel)] [Department of Mathematics, University of Haifa, Haifa (Israel)

    2013-12-15

    In a previous paper, we have shown that the geometry of double field theory has a natural interpretation on flat para-Khler manifolds. In this paper, we show that the same geometric constructions can be made on any para-Hermitian manifold. The field is interpreted as a compatible (pseudo-)Riemannian metric. The tangent bundle of the manifold has a natural, metric-compatible bracket that extends the C-bracket of double field theory. In the para-Khler case, this bracket is equal to the sum of the Courant brackets of the two Lagrangian foliations of the manifold. Then, we define a canonical connection and an action of the field that correspond to similar objects of double field theory. Another section is devoted to the Marsden-Weinstein reduction in double field theory on para-Hermitian manifolds. Finally, we give examples of fields on some well-known para-Hermitian manifolds.

  1. Towards a double field theory on para-Hermitian manifolds

    NASA Astrophysics Data System (ADS)

    Vaisman, Izu

    2013-12-01

    In a previous paper, we have shown that the geometry of double field theory has a natural interpretation on flat para-Khler manifolds. In this paper, we show that the same geometric constructions can be made on any para-Hermitian manifold. The field is interpreted as a compatible (pseudo-)Riemannian metric. The tangent bundle of the manifold has a natural, metric-compatible bracket that extends the C-bracket of double field theory. In the para-Khler case, this bracket is equal to the sum of the Courant brackets of the two Lagrangian foliations of the manifold. Then, we define a canonical connection and an action of the field that correspond to similar objects of double field theory. Another section is devoted to the Marsden-Weinstein reduction in double field theory on para-Hermitian manifolds. Finally, we give examples of fields on some well-known para-Hermitian manifolds.

  2. Son las polticas locales una buena estrategia para dinamizar el mercado de trabajo? Algunos elementos para el caso colombiano

    Microsoft Academic Search

    Diana Galvis G; Mauricio Lpez Gonzalez

    2010-01-01

    Resumen: En perodos de bajo crecimiento econmico, tiempos de recesin o crisis econmica, implementar una poltica fiscal contra-cclica puede ser una herramienta fundamental para crear empleo y dinamizar la economa. En Colombia, especficamente en las principales ciudades del pas existe una posibilidad concreta para que los gobiernos locales, a travs de incrementos del gasto de inversin, impacten positivamente en la

  3. Dissociative recombination of highly enriched para-H3+

    NASA Astrophysics Data System (ADS)

    Tom, Brian A.; Zhaunerchyk, Vitali; Wiczer, Michael B.; Mills, Andrew A.; Crabtree, Kyle N.; Kaminska, Magdalena; Geppert, Wolf D.; Hamberg, Mathias; af Ugglas, Magnus; Vigren, Erik; van der Zande, Wim J.; Larsson, Mats; Thomas, Richard D.; McCall, Benjamin J.

    2009-01-01

    The determination of the dissociative recombination rate coefficient of H3+ has had a turbulent history, but both experiment and theory have recently converged to a common value. Despite this convergence, it has not been clear if there should be a difference between the rate coefficients for ortho-H3+ and para-H3+. A difference has been predicted theoretically and could conceivably impact the ortho:para ratio of H3+ in the diffuse interstellar medium, where H3+ has been widely observed. We present the results of an experiment at the CRYRING ion storage ring in which we investigated the dissociative recombination of highly enriched (83.6%) para-H3+ using a supersonic expansion source that produced ions with Trot60-100 K. We observed an increase in the low energy recombination rate coefficient of the enriched para-H3+ by a factor of 1.25 in comparison to H3+ produced from normal H2 (ortho:para=3:1). The ratio of the rate coefficients of pure para-H3+ to that of pure ortho-H3+ is inferred to be 2 at low collision energies; the corresponding ratio of the thermal rate coefficients is 1.5 at electron temperatures from 60 to 1000 K. We conclude that this difference is unlikely to have an impact on the interstellar ortho:para ratio of H3+.

  4. Construction of a Para-Ortho Hydrogen Test Cryostat

    NASA Astrophysics Data System (ADS)

    Essler, J.; Haberstroh, Ch.

    2010-04-01

    In a prospective hydrogen economy it is necessary to verify the para concentration of the employed hydrogen. In case of a short storage time of about a few days only it has been shown that a partial conversion into para-hydrogen gives an optimized overall efficiency. Hence, an easy and reliable method of measuring the para-hydrogen concentration is needed. In this paper, the concept and construction of a small test cryostat are described and first results are presented. The measuring principle is based on a catalytic induced adiabatic ortho-para conversion of a hydrogen gas flow starting from a known temperature. The operation of the system only requires a certain amount of liquid nitrogen as coolant. To determine the concentration of para-hydrogen it is only necessary to measure the temperature of the gas before and after the adiabatic catalyst cell. The measuring cryostat is used for further investigation of the spontaneous para-ortho conversion in the supercritical state. In addition, the design of the cryostat allows the investigation of different catalyst materials regarding the catalytic activity and possible degradation by using a known para concentration for the measurement.

  5. Influence of size effects on para-dichlorobenzene lattice dynamics

    NASA Astrophysics Data System (ADS)

    Korshunov, M. A.

    2010-05-01

    We have obtained experimental low-frequency Raman spectra for light scattering by nanoparticles of para-dichlorobenzene of size 300-70 nm. As their sizes decrease, the line frequencies decrease. The size of the nanoparticles was determined using an electron microscope. We found that in the lattice vibrational spectrum of nanoparticles of size 300-70 nm, a summed spectrum appears from ?- para-dichlorobenzene and ?- para-ichlorobenzene. This is consistent with molecular dynamics calculations of the structure of the nanoparticle and calculations of the histograms for the lattice vibrational spectra by the Dean method.

  6. Kinetics and mechanism of benzyl para -chlorophenyl ketone oxidation

    Microsoft Academic Search

    O. A. Revkov; S. G. Voronina; A. L. Perkel

    2007-01-01

    The oxidation of benzyl para-chlorophenyl ketone in chlorobenzene at 100C occurs through the formation of short chains. Non-peroxide reaction products\\u000a (1-(4-chlorophenyl)-2-hydroxy-2-phenyl-1-ethanone, para-chlorobenzyl, benzaldehyde, and para-chlorobenzoic acid) are formed not only by the transformation of hydroperoxide (1-(4-chlorophenyl)-2-hydroxy-2-phenyl-1-ethanone)\\u000a but also (or solely) through the recombination of ?-ketoperoxyl radicals with or without chain termination. ?-Hydroperoxide\\u000a decomposes predominantly through a heterolytic route to form

  7. Vibronic Spectroscopy of a Nitrile/Isonitrile Isoelectronic Pair: para-Diisocyanobenzene and para-Isocyanobenzonitrile.

    PubMed

    Mehta-Hurt, Deepali N; Korn, Joseph A; Gutberlet, Anna K; Zwier, Timothy S

    2015-03-26

    The ultraviolet spectroscopy of isoelectronic pair para-diisocyanobenzene (pDIB) and para-isocyanobenzonitrile (pIBN) has been studied under gas-phase, jet-cooled conditions. These molecules complete a sequence of mono and disubstituted nitrile/isonitrile benzene derivatives, enabling a comparison of the electronic effects of such substitution. Utilizing laser-induced fluorescence (LIF) and resonant two-photon ionization (R2PI) spectroscopy, the S0-S1 electronic origins of pDIB and pIBN have been identified at 35?566 and 35?443 cm(-1), respectively. In pDIB, the S0-S1 origin is very weak, with b3g fundamentals induced by vibronic coupling to the S2 state dominating the spectrum at 501 cm(-1) (?17, isocyano bend) and 650 cm(-1) (?16, ring distortion). The spectrum extends over 5000 cm(-1), remaining sharp and relatively uncongested over much of this range. Dispersed fluorescence (DFL) spectra confirm the dominating role played by vibronic coupling and identify Franck-Condon active ring modes built off the vibronically-induced bands. In pDIB, the S2 state has been tentatively observed at about 6100 cm(-1) above the S0-S1 origin. In pIBN, the S0-S1 origin is considerably stronger, but vibronic coupling still plays an important role, involving fundamentals of b2 symmetry. The bending mode of the nitrile group dominates the vibronically-induced activity. Calculations carried out at the TD-DFT B3LYP/6-31+G(d) level of theory account for the extremely weak S0-S1 oscillator strength of pDIB and the larger intensity of the S0-S1 origins of pIBN and pDCB (para-dicyanobenzene) as nitrile groups are substituted for isonitrile groups. In pDIB, a nearly perfect cancellation of transition dipoles occurs due to two one-electron transitions that contribute nearly equally to the S0-S1 transition. The spectra of both molecules show no clear evidence of charge-transfer interactions that play such an important role in some cyanobenzene derivatives. PMID:25699407

  8. Preguntas para hacerle al doctor acerca del cncer

    Cancer.gov

    Serie de preguntas, organizadas por tema, que los pacientes con cncer pueden hacerle al mdico o a otros miembros de su equipo de atencin mdica para conocer ms acerca de su tipo de cncer y lo que pueden esperar.

  9. DIANA: Anlisis del discurso para la comprensin del conocimiento

    E-print Network

    Rosso, Paolo

    DIANA: Análisis del discurso para la comprensión del conocimiento DIANA: DIscourse ANAlysis by the Spanish Ministry of Economy and Competitiveness. Paolo Rosso coordinates the DIANA project and leads

  10. Inmunoterapia: Uso del sistema inmunitario para tratar el cncer

    Cancer.gov

    Resumen de los mtodos de inmunoterapia utilizados para tratar el cncer, tales como el uso de anticuerpos monoclonales, transferencia celular adoptiva, vacunas de tratamiento contra el cncer y sustancias modificadoras de la respuesta inmunitaria.

  11. Control del dolor: Apoyo para las personas con cncer

    Cancer.gov

    Libro sobre el control del dolor en pacientes con cncer. Cubre los mtodos y medicinas, as como los efectos fsicos y emocionales del dolor. Es una adaptacin cultural para el pblico de habla hispana del libro en ingls Pain Control.

  12. La terapia hormonal para la menopausia y el cncer

    Cancer.gov

    Hoja informativa acerca de los resultados de los estudios sobre el uso de la terapia hormonal para la menopausia. Incluye informacin sobre el efecto de esta terapia en el cuerpo y explica los riesgos y beneficios del uso de hormonas.

  13. DEPARTAMENTO DE INGENIERIA INFORMATICA Normativas para el Programa Doctorado del

    E-print Network

    Autonoma de Madrid, Universidad

    DEPARTAMENTO DE INGENIERIA INFORMATICA Normativas para el Programa Doctorado del Departamento de Valiente, 11. Madrid, 28049. Teléfono: 914972230 #12;DEPARTAMENTO DE INGENIERIA INFORMATICA 4. Una vez

  14. MANUAL PARA EL ANLISIS ECONMICO DE REAS NATURALES PROTEGIDAS EN

    E-print Network

    Enrquez Andrade, Roberto Ramn

    VOLUMEN 3 INSTRUMENTOS, ESTRATEGIAS E INCENTIVOS ECONMICOS PARA LA CONSERVACIN EN LAS REAS NATURALES.3. Regulacin directa o instrumentos econmicos?......................................... 4 1.4. El contexto goce o aprovechamiento...................................... 19 5. Instrumentos financieros

  15. Mensaje para alumnos y padres - Duration: 3:01.

    NASA Video Gallery

    El astronauta de la NASA Jos Hernndez alienta a los estudiantes a que sigan sus sueos. Hernndez tambin habla acerca del papel que juegan los padres para ayudar a que sus hijos hagan realidad s...

  16. Preguntas para el doctor si tiene un cncer avanzado

    Cancer.gov

    Serie de preguntas que los pacientes con cncer pueden hacerle al mdico sobre las opciones de tratamiento si el cncer es avanzado, las formas de controlar los sntomas y cmo prepararse para la etapa final de la vida.

  17. 40 CFR 721.9520 - Methylated-para-rosaniline salt of a trisulfonated triarylmethane dye (generic).

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... false Methylated-para-rosaniline salt of a trisulfonated triarylmethane dye...9520 Methylated-para-rosaniline salt of a trisulfonated triarylmethane dye...generically as methylated-para-rosaniline salt of a trisulfonated triarylmethane...

  18. 40 CFR 721.9520 - Methylated-para-rosaniline salt of a trisulfonated triarylmethane dye (generic).

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... false Methylated-para-rosaniline salt of a trisulfonated triarylmethane dye...9520 Methylated-para-rosaniline salt of a trisulfonated triarylmethane dye...generically as methylated-para-rosaniline salt of a trisulfonated triarylmethane...

  19. Cooling by conversion of para to ortho-hydrogen

    NASA Technical Reports Server (NTRS)

    Sherman, A. (inventor)

    1983-01-01

    The cooling capacity of a solid hydrogen cooling system is significantly increased by exposing vapor created during evaporation of a solid hydrogen mass to a catalyst and thereby accelerating the endothermic para-to-ortho transition of the vapor to equilibrium hydrogen. Catalyst such as nickel, copper, iron or metal hydride gels of films in a low pressure drop catalytic reactor are suitable for accelerating the endothermic para-to-ortho conversion.

  20. Pasanta en TICs para el Carlos Rey Moreno

    E-print Network

    Autonoma de Madrid, Universidad

    EHAS 3 en Perú con GTR-PUCP Objetivo Madrid: Desarrollo software para la mejora de la metodología de1 Pasantía en TICs para el desarrollo Carlos Rey Moreno I.T.T Sistemas de Telecomunicación UC3M MSc Relaciones Internacionales y Desarrollo AAU Investigador Fundación EHAS Actividades académicas en Cooperación

  1. Para hydrogen equilibration in the atmospheres of the outer planets

    NASA Technical Reports Server (NTRS)

    Conrath, Barney J.

    1986-01-01

    The thermodynamic behavior of the atmospheres of the Jovian planets is strongly dependent on the extent to which local thermal equilibration of the ortho and para states of molecular hydrogen is achieved. Voyager IRIS data from Jupiter imply substantial departures of the para hydrogen fraction from equilibrium in the upper troposphere at low latitudes, but with values approaching equilibrium at higher latitudes. Data from Saturn are less sensitive to the orth-para ratio, but suggest para hydrogen fractions near the equilibrium value. Above approximately the 200 K temperature level, para hydrogen conversion can enhance the efficiency of convection, resulting in a substantial increase in overturning times on all of the outer planets. Currently available data cannot definitively establish the ortho-para ratios in the atmospheres of Uranus and Neptune, but suggest values closer to local equilibrium than to the 3.1 normal ratio. Modeling of sub-millimeter wavelength measurements of these planets suggest thermal structures with frozen equilibrium lapse rates in their convective regions.

  2. ParaText : scalable text modeling and analysis.

    SciTech Connect

    Dunlavy, Daniel M.; Stanton, Eric T.; Shead, Timothy M.

    2010-06-01

    Automated processing, modeling, and analysis of unstructured text (news documents, web content, journal articles, etc.) is a key task in many data analysis and decision making applications. As data sizes grow, scalability is essential for deep analysis. In many cases, documents are modeled as term or feature vectors and latent semantic analysis (LSA) is used to model latent, or hidden, relationships between documents and terms appearing in those documents. LSA supplies conceptual organization and analysis of document collections by modeling high-dimension feature vectors in many fewer dimensions. While past work on the scalability of LSA modeling has focused on the SVD, the goal of our work is to investigate the use of distributed memory architectures for the entire text analysis process, from data ingestion to semantic modeling and analysis. ParaText is a set of software components for distributed processing, modeling, and analysis of unstructured text. The ParaText source code is available under a BSD license, as an integral part of the Titan toolkit. ParaText components are chained-together into data-parallel pipelines that are replicated across processes on distributed-memory architectures. Individual components can be replaced or rewired to explore different computational strategies and implement new functionality. ParaText functionality can be embedded in applications on any platform using the native C++ API, Python, or Java. The ParaText MPI Process provides a 'generic' text analysis pipeline in a command-line executable that can be used for many serial and parallel analysis tasks. ParaText can also be deployed as a web service accessible via a RESTful (HTTP) API. In the web service configuration, any client can access the functionality provided by ParaText using commodity protocols ... from standard web browsers to custom clients written in any language.

  3. Sistemas Correctores de Campo Para EL Telescopio Cassegrain IAC80

    NASA Astrophysics Data System (ADS)

    Galan, M. J.; Cobos, F. J.

    1987-05-01

    El proyecto de instrumentacin de mayor importancia que ha tenido el Instituto de Astrofisica de Canarias en los ltimos afios ha sido el diseflo y construccin del te1escopio IAC8O. Este requera del esfuerzo con junto en mecnica, ptica y electrnica, lo que facilit la estructuracin y el crecimiento de los respectivos grupos de trabajo, que posteriormente se integraron en departamentos En su origen (1977), el telescopio IAC80 fue concebido como un sistema clsico tipo Cassegrain, con una razn focal F/i 1.3 para el sistema Casse grain y una razn focal F/20 para el sistema Coud. Posteriormente, aunque se mantuvo la filosofia de que el sistema bsico fuera el F/11.3, se consider conveniente el diseo de secundarios para razones focales F/16 y F/32, y se elimin el de F/20. Sin embargo, dada la importancia relativa que un foco estrictamente fotogrfico tiene en un telescopio moderno, diseado bsicamente para fotometra fotoelctrica y con un campo util mnimamente de 40 minutos de arco, se decdi Ilevar a cabo el diseo de un secundario F/8 con un sistema corrector de campo, pero que estuviera formado nicamente por lentes con superficies esfricas para que asl su construccin fuera posible en Espaa en Mxico. La creciente utilizacin de detectores bidimensionales para fines de investigacin astron6mica y la viabilidad de que en un futuro cercano stos tengan un rea sensible cada vez mayor, hicieron atractiva la idea de tener diseado un sistema corrector de campo para el foco primario (F/3), con un campo til mnimo de un grado, y tambin con la limitante de que sus componentes tuvieron slamente suprficies esfricas. Ambos diseos de los sis-temas correctores de campo se llevaron a cabo, en gran medida, como parte de un proyecto de colaboracin e intercambio en el rea de diseo y evaluacin de sistemas pticos.

  4. Evolution of invertebrate deuterostomes and Hox/ParaHox genes.

    PubMed

    Ikuta, Tetsuro

    2011-06-01

    Transcription factors encoded by Antennapedia-class homeobox genes play crucial roles in controlling development of animals, and are often found clustered in animal genomes. The Hox and ParaHox gene clusters have been regarded as evolutionary sisters and evolved from a putative common ancestral gene complex, the ProtoHox cluster, prior to the divergence of the Cnidaria and Bilateria (bilaterally symmetrical animals). The Deuterostomia is a monophyletic group of animals that belongs to the Bilateria, and a sister group to the Protostomia. The deuterostomes include the vertebrates (to which we belong), invertebrate chordates, hemichordates, echinoderms and possibly xenoturbellids, as well as acoelomorphs. The studies of Hox and ParaHox genes provide insights into the origin and subsequent evolution of the bilaterian animals. Recently, it becomes apparent that among the Hox and ParaHox genes, there are significant variations in organization on the chromosome, expression pattern, and function. In this review, focusing on invertebrate deuterostomes, I first summarize recent findings about Hox and ParaHox genes. Next, citing unsolved issues, I try to provide clues that might allow us to reconstruct the common ancestor of deuterostomes, as well as understand the roles of Hox and ParaHox genes in the development and evolution of deuterostomes. PMID:21802045

  5. Study on cross-reactivity to the para group.

    PubMed

    Picardo, M; Cannistraci, C; Cristaudo, A; De Luca, C; Santucci, B

    1990-01-01

    In 80 patients, positive to at least one hapten of the para group (para-phenylenediamine, diaminodiphenylmethane, benzocaine, PPD mix), patch tests were carried out with freshly prepared solutions of para-phenylenediamine (PPD) and of 3 selected aromatic compounds related structurally to PPD (para-aminophenol, ortho-aminophenol, hydroquinone). The number of positive reactions correlated with the rate of decomposition of the substances as evaluated by high-pressure liquid chromatography. PPD, which was almost decomposed after 24 h, gave the highest number of positive reactions, followed by ortho-aminophenol and by para-aminophenol, while hydroquinone, which was oxidized to the extent of 35%, did not give any reactions. To evaluate if a different rate of oxidation can modify the patch test response, in the same patients and in 10 normal volunteers, tests were carried out with PPD solutions containing the oxidizing agent silver oxide (0.1%). By this procedure a significant increase in the number of positive responses was observed. The results suggest that the rate of decomposition and therefore the amount of quinone(s) generated, might be the key to eliciting patch test responses to oxidizable aromatic haptens. PMID:2242776

  6. El uso de la neuromodulacin para el tratamiento del temblor

    PubMed Central

    Bendersky, Damin; Ajler, Pablo; Yampolsky, Claudio

    2014-01-01

    Introduccin: El temblor puede ser un desorden incapacitante y el tratamiento de primera lnea para estos pacientes es farmacolgico. Sin embargo, este tratamiento puede llevar a una reduccin satisfactoria del temblor en slo el 50% de los pacientes con temblor esencial. La talamotoma era el tratamiento de eleccin para el temblor refractario al tratamiento mdico hasta que comenz a utilizarse la estimulacin cerebral profunda (ECP) del ncleo ventral intermedio (Vim) del tlamo. En la actualidad, raramente se realiza la talamotoma. Mtodos: Este artculo es una revisin no sistemtica de las indicaciones, resultados, parmetros de programacin y tcnica quirrgica de la ECP del Vim para el tratamiento del temblor. Resultados: Aunque los resultados clnicos son similares usando la talamotoma o la ECP del Vim, la primera causa ms efectos adversos que la ltima. Adems, la ECP puede ser usada bilateralmente, mientras que la talamotoma tiene un alto riesgo de causar disartria cuando se realiza de ambos lados. La ECP del Vim logr una adecuada mejora del temblor en varias series de pacientes con temblor causado por temblor esencial, enfermedad de Parkinson o esclerosis mltiple. Adems del Vim, hay otros blancos que estn siendo usados por varios autores, tales como la zona incerta y las radiaciones prelemniscales. Conclusin: La ECP del Vim es un tratamiento til para el temblor incapacitante refractario al tratamiento mdico. Es esencial realizar una precisa seleccin de pacientes, as como utilizar una tcnica quirrgica correcta. An se desconoce el mejor blanco estereotctico para el temblor, aunque el Vim es el ms usado. PMID:25165613

  7. Hox and ParaHox genes: a review on molluscs.

    PubMed

    Biscotti, Maria Assunta; Canapa, Adriana; Forconi, Mariko; Barucca, Marco

    2014-12-01

    Hox and ParaHox genes are involved in patterning the anterior-posterior body axis in metazoans during embryo development. Body plan evolution and diversification are affected by variations in the number and sequence of Hox and ParaHox genes, as well as by their expression patterns. For this reason Hox and ParaHox gene investigation in the phylum Mollusca is of great interest, as this is one of the most important taxa of protostomes, characterized by a high morphological diversity. The comparison of the works reviewed here indicates that species of molluscs, belonging to different classes, share a similar composition of Hox and ParaHox genes. Therefore evidence suggests that the wide morphological diversity of this taxon could be ascribed to differences in Hox gene interactions and expressions and changes in the Hox downstream genes rather than to Hox cluster composition. Moreover the data available on Hox and ParaHox genes in molluscs compared with those of other Lophotrochozoa shed light on the complex and controversial evolutionary histories that these genes have undergone within protostomes. PMID:25394269

  8. Matriz de contabilidad social extendida ambientalmente para anlisis econmico de la regin del Bio Bio

    Microsoft Academic Search

    Cristian Mardones P; Jorge Saavedra E

    2011-01-01

    Se construye una Matriz de Contabilidad Social Extendida Ambientalmente para la Regin del Bo Bo. Para ello aplicamos el mtodo indirecto conocido como Cross Entropy para actualizar una Matriz de Contabilidad Social de esta regin desde el ao 1996 al 2006. Esta matriz sirve de base para un anlisis de multiplicadores, cuyo fin es identificar los sectores productivos de la

  9. Un algoritmo para la deteccion de horizonte en dispositivos voladores radiocontrolados

    Microsoft Academic Search

    Pablo Odorico; Claudio Delrieux

    Presentamos un algoritmo para la deteccion no supervisada en tiempo real del hori- zonte en imagenes de video. El mismo estad isenado para ser implementado en dispositivos autonomos de bajo costo y capacidad de computo (microcontroladores), como para ser incorporados en vehculos voladores no tripulados (UAVs). Esto permitiral a obtencion de informacion indispensable para la orientacion, navegacion, georeferenciamiento y la

  10. Usina de cincias: um espao pedaggico para aprendizagens mltiplas

    NASA Astrophysics Data System (ADS)

    Martin, V. A. F.; Poppe, P. C. R.; Orrico, A. C. P.; Pereira, M. G.

    2003-08-01

    Entendemos que o Ensino de Astronomia especialmente apropriado para motivar os alunos e aprofundar contedos em diversas reas do conhecimento, pois envolve temas ligados Fsica, Matemtica, Qumica, Computao, Tratamento de Imagens e Instrumentao de Alta Preciso, alm daqueles pertinentes as reas de Geografia, Histria e Antropologia. Contudo, apesar do carter interdisciplinar que esta cincia possui, a realidade atual que a maioria dos professores em sala de aula no foram devidamente capacitados, durante o perodo de formao acadmica, para ministrar contedos de Astronomia nos atuais Ensinos Fundamental e Mdio. Neste trabalho, discutiremos de maneira ampla, num primeiro momento, a realidade do atual ensino de cincias praticado no Estado da Bahia, apontando por dependncia administrativa, o crescimento e a reduo do nmero de escolas, da taxa de analfabetismo por faixa etria, da escolarizao, do atendimento, da aprovao, reprovao e abandono, de equipamentos e laboratrios e o grau de formao dos nossos atuais professores em pleno exerccio de atividade docente. Num segundo momento, discutiremos o papel do Observatrio Astronmico Antares/UEFS dentro desse contexto, ou seja, suas aes implementadas ao longo dos ltimos anos e em particular, o recente projeto de extenso Ensino e Difuso de Astronomia, financiado pela Fundao Vitae, que procura traduzir no ldico, no brincar de cincias, um espao pedaggico para aprendizagens mltiplas. Neste, o papel do professor multiplicador associado ao laboratrio de kits didticos, de fcil construo e manipulao (alguns dos quais sero mostrados), perfazem os principais veculos para o desenvolvimento de conhecimentos, atitudes, habilidades e valores que preparam os nossos alunos para a carreira tcnico-cientfica e para sua participao crtica e criativa na Sociedade.

  11. Estudiar las redes sociales: Aportes y perspectivas para las

    E-print Network

    Paris-Sud XI, Universit de

    Estudiar las redes sociales: Aportes y perspectivas para las ciencias sociales Claire Bidart LEST muchas razones en interesarse en las redes socia- les. Estos sistemas relacionales construyen lazos entre estructuracio- nes, sus dinmicas. Transversales a los grupos y a las estructuras sociales glo- bales, las redes

  12. Reconocimiento robusto de marcadores artificiales para la navegacion de robots

    E-print Network

    Escolano, Francisco

    cambios de escala. Los experimentos demuestran que nuestra soluci´on es r´apida y muy robusta incluso en Introducci´on Dentro del campo de investigaci´on dedicado a la navegaci´on de robots, son mu- chos los experimentos. 2 Histogramas polares Los histogramas polares son definidos como un medio para comparar s

  13. actuar en el Sur y para el Sur

    E-print Network

    Pginas 06-07 Recursos para la investigacin El IRD en 2013 Investigaciones de excelencia La Agencia desarrollo. As, las investigaciones sobre el cambio climtico, la gestin de los recursos, la biodiversidad lado, de una progresin cuanti- tativa y cualitativa de las publicaciones del IRD y la tasa de copu

  14. CHAMADA PARA APRESENTAO DE PROPOSTAS Programa Santander TOP USA MASSACHUSETSS

    E-print Network

    Chaimowicz, Luiz

    CHAMADA PARA APRESENTAO DE PROPOSTAS Programa Santander TOP USA MASSACHUSETSS O Diretor de Relaes Internacionais da Universidade Federal de Minas Gerais, Prof. Eduardo Viana Vargas, no uso de suas EUA, no mbito do Programa Santander TOP USA MASSACHUSSETSS, gerenciado UNICAMP conforme

  15. Acerca del Centro para la Salud Mundial del NCI

    Cancer.gov

    El Centro para la Salud Mundial (CGH) coordina y fija las prioridades en las actividades que lleva a cabo el Instituto Nacional del Cncer a nivel mundial. Su objetivo es avanzar la investigacin mundial del cncer y reducir las muertes causadas por esta enfermedad.

  16. Sistemas de ayuda inteligente para entornos informticos complejos

    Microsoft Academic Search

    Baltasar Fernndez Manjn

    2001-01-01

    Los sistemas de ayuda inteligente (SAI) o asistentes inteligentes son una propuesta para mejorar el aprendizaje y el rendimiento en la utilizacin de entornos informticos complejos. Habitualmente la ayuda tiene como nico fin la mejora del rendimiento del usuario, pero nosotros creemos que dicha asistencia debe tener tambin un propsito educativo. Si el usuario mejora su conocimiento sobre la aplicacin

  17. Propuestas para la formacin de conceptos en informtica

    Microsoft Academic Search

    Dora Mercedes Prez Mok; Idalmis Urgells Castillo

    2011-01-01

    Las tecnologas de la informtica (TI) imponen poner en prctica estrategias comunicativas y educativas para establecer nuevas formas de enseanza y aprendizaje. La enseanza-aprendizaje de la Informtica es una problemtica actual. En que es necesario estudiarla, no son muchos los que se disgregan; pero en qu y cmo ensear, si existen grandes divergencias de criterios y enfoques. En este trabajo

  18. ELABORACION DE ALGORITMOS DE PRUEBA PARA RELES DE PROTECCION

    E-print Network

    Boyer, Edmond

    protección de naturaleza electrónica digital; estos mismos, para su control periódico requieren de pruebas nature; these same ones, for their periodic control require of tests with the object of corroborating with the equipment PULSAR. 1. INTRODUCCION La continuidad y la calidad del servicio son dos requisitos íntimamente

  19. Para-acetabular periarthritis calcarea: Its radiographic manifestations

    Microsoft Academic Search

    Akira Kawashima; Sadayuki Murayama; Toshiyuki Ohuchida; Walter J. Russell

    1988-01-01

    On retrospective reviews of radiographs, periarthritis calcarea was distinguished from os acetabula by interval radiographic progression and regression. Among 59 men and 51 women, there were 137 instances of para-acetabular calcifications and ossifications, which were morphologically classified as 58 discrete, 58 amorphous, and 21 segmented types. Correlations with other radiographic abnormalities, symptoms, signs, and laboratory abnormalities were sought, but not

  20. Una Arquitectura para una Herramienta de Patrones de Diseo

    E-print Network

    Molina, Jess Garca

    Una Arquitectura para una Herramienta de Patrones de Diseo Jos Sez Martnez1 , Jess Garca herramientas es necesario disponer de una arquitectura flexible que permita manipularlos eficientemente. Este trabajo presenta una arquitectura, basada a su vez en patrones, diseada con este fin y describe una

  1. Para-[18F]-fluorohippurate [ [18F]-PFH

    E-print Network

    Levin, Judith G.

    are evaluating the use of dynamic SPECT or positron emission tomography (PET) to assess kidney function to evaluate kidney function and perform renography with PET, para-18F-fluorohippurate ([18F]-PFH), a renal emission tomography (PET) Source of signal / contrast: 18F Activation: No Studies: In vitro Rodents

  2. IMAGEN TRIDIMENSIONAL DE SUSTRATOS BIODEGRADABLES PARA SOPORTE CELULAR

    Microsoft Academic Search

    Leoncio Garrido

    En la ltima dcada se ha despertado un gran inters en investigar y desarr ollar biomateriales con propiedades ptimas para la reparacin y regeneracin de tejidos 1. Idealmente, el objetivo es obtener una estructura extracelular que, despus de proporcionar soporte inicial a las clulas, se reabsorba durante la regeneracin del t ejido y finalmente sea remplazada completamente sin perjuicio o

  3. Recursos financieros Familias confan en varios recursos para pagar costos

    E-print Network

    Recursos financieros Familias confían en varios recursos para pagar costos universitarios. Cuando Recursos personales que ya tienen Recursos financieros que pueden buscar Las fechas de vencimiento de la contribuido tu familia ha este fondo? Recursos financieros que tú puedes buscar Llenar la solicitud por ayuda

  4. Ambiente para la Captura y Administracin de Versiones de Modelos

    Microsoft Academic Search

    Diego Snchez Schenone; Silvio Gonnet; Horacio Leone

    El proceso de desarrollo de modelos para la gestin, investigacin, produccin, etc., en general involucra actividades creativas, que frecuentemente son poco estructuradas, es decir, no existe un flujo de trabajo definido previamente. Durante este proceso se genera un gran nmero de modelos de distinto nivel de abstraccin del objeto que se desarrolla, el cual puede consistir en un sistema de

  5. Analyzing and Visualizing Cosmological Simulations with ParaView

    SciTech Connect

    Woodring, Jonathan [Los Alamos National Laboratory (LANL); Heitmann, Katrin [ORNL; Ahrens, James P [ORNL; Fasel, Patricia [Los Alamos National Laboratory (LANL); Hsu, Chung-Hsing [ORNL; Habib, Salman [ORNL; Pope, Adrian [Los Alamos National Laboratory (LANL)

    2011-01-01

    The advent of large cosmological sky surveys - ushering in the era of precision cosmology - has been accompanied by ever larger cosmological simulations. The analysis of these simulations, which currently encompass tens of billions of particles and up to a trillion particles in the near future, is often as daunting as carrying out the simulations in the first place. Therefore, the development of very efficient analysis tools combining qualitative and quantitative capabilities is a matter of some urgency. In this paper, we introduce new analysis features implemented within ParaView, a fully parallel, open-source visualization toolkit, to analyze large N-body simulations. A major aspect of ParaView is that it can live and operate on the same machines and utilize the same parallel power as the simulation codes themselves. In addition, data movement is in a serious bottleneck now and will become even more of an issue in the future; an interactive visualization and analysis tool that can handle data in situ is fast becoming essential. The new features in ParaView include particle readers and a very efficient halo finder that identifies friends-of-friends halos and determines common halo properties, including spherical overdensity properties. In combination with many other functionalities already existing within ParaView, such as histogram routines or interfaces to programming languages like Python, this enhanced version enables fast, interactive, and convenient analyses of large cosmological simulations. In addition, development paths are available for future extensions.

  6. Modelo para la Integracin de Tecnologas en Educacin Superior

    Microsoft Academic Search

    Pedro A. Willging; Norma I. Scagnoli

    Abstract En este trabajo se discute un modelo para la incorporacinde tecnologas en educacin superior. Este modelo surge a partir de un proyecto de investigacinque est siendo desarrollado en conjunto por investigadores de la Universidad Nacional de La Pampa (Argentina) y de la Universidad de Illinois (USA). La colaboracin interdisciplinaria de docentes e investigadorescon experiencia en las reas de e-learning

  7. EL APORTE DE LA NEUROCIENCIA PARA LA FORMACIN DOCENTE

    Microsoft Academic Search

    Susan Francis Salazar

    2005-01-01

    Resumen: El siguiente artculo se propone, a partir del anlisis de un proceso de investigacin sobre el rea pedaggica en los planes de formacin docente, realizar una invitacin a la incorporacin del estudio del cerebro humano, como eje dentro de la formacin profesional para el ejercicio docente. La capacidad de educabilidad propia de los seres humanos tiene su explicacin sobre

  8. Terapias adyuvantes y neoadyuvantes para el cncer de seno

    Cancer.gov

    Hoja informativa que explica las terapias adyuvantes (tratamiento que se administra adems de la terapia primaria para aumentar la posibilidad de supervivencia a largo plazo) y las neoadyuvantes (terapia que se administra antes de la terapia principal). Contiene informacin sobre los efectos secundarios y sobre los riesgos y beneficios de estas terapias.

  9. Marvin, rob construtor para competio em robtica mvel

    Microsoft Academic Search

    Andr Martin Narciso; Carlos Augusto; Bentes da Silva; Jackson Paul Matsuura

    renatohsp@gmail .com Resumo: Este artigo sobre a construo do rob autnomo Marvin o Construtor, que foi construdo para participar da IV Competio IEEE Brasileira de Rob. A tarefa consiste em empilhar blocos em uma rea predeterminada em um menor tempo possvel, ganha a torre mais alta. O rob, construdo por alunos do Instituto Tecnolgico de Aeronutica (ITA), foi construdo

  10. O JORNAL ESCOLAR: INSTRUMENTO PARA A FORMAO CRTICA E CIDAD

    Microsoft Academic Search

    Rosana Cristina DA CUNHA

    RESUMO: Neste relato de pesquisa, pretendo analisar a viabilidade de se trabalhar, na escola, com a produo do jornal escolar como recurso para mobilizar uma srie de aes visando promoo, no aluno, da conscincia crtica dos usos da linguagem no mundo e da sua formao enquanto ser participativo e agente em questes que lhe dizem respeito dentro e fora

  11. Algoritmo genetico para o problema de rotas de cobertura multiveiculo

    E-print Network

    Gomes, Francisco A. M.

    Algoritmo genetico para o problema de rotas de cobertura multiveiculo Washington Alves dec~oes subotimas s~ao obtidas aplicando-se duas propostas de algoritmo genetico (AG), os quais geram rotas de tamanho menor possivel. Palavras-chave: Programac~ao inteira e combinatoria, algoritmo genetico

  12. Creciendo Juntos Plan de la Universidad de Columbia para

    E-print Network

    Hone, James

    proyecto de reubicación y reconstrucción de utilidades para sustituir alcantarillado y tuberías de agua y calles 129th y 125th a un ya existente regulador del alcantarillado en la avenida 12th. Columbia adjudicó

  13. Anise oil as para-methoxyamphetamine (PMA) precursor

    Microsoft Academic Search

    Dieter Waumans; Nol Bruneel; Jan Tytgat

    2003-01-01

    These days, MDMA is one of the most popular drugs of abuse. Due to its illegality, MDMA and its chemical precursors are watched by governmental organizations in many countries. To avoid conflicts with legal instances, underground chemists have tried to market several new unregulated amphetamine analogues, such as 4-MTA. Para-methoxyamphetamine (PMA), on the other hand, is regulated by law but

  14. ACUTE TOXICITY OF PARA-NONYLPHENOL TO SALTWATER ANIMALS

    EPA Science Inventory

    ?para-Nonylphenol (PNP), a mixture of alkylphenols used in producing nonionic surfactants, is distributed widely in surface waters and aquatic sediments, where it can affect saltwater species. This article describes a database for acute toxicity of PNP derived for calculating a n...

  15. UN ESQUEMA ADAPTATIVO PARA LA COMPRESION DE IMAGENES

    E-print Network

    Amat, Sergio

    articulo de Amat, Ar`andiga, Cohen, Donat, Garcia y von Oehsen titulado "Data compresion with ENOUN ESQUEMA ADAPTATIVO PARA LA COMPRESION DE IMAGENES En la era de la comunicacion en la que la compresion de imagenes. Con compresion nos referimos a tener una version de la foto original

  16. Subastando la Energa para Clientes Regulados: Un Anlisis de Equilibrio

    Microsoft Academic Search

    Francisco Caravia; Eduardo Saavedra

    2005-01-01

    La reciente liberalizacin del mercado de generacin elctrica para clientes regulados autoriza a las empresas distribuidoras a contratar energa a precios que pueden ser superiores al precio nudo fijado por el regulador, traspasndolos ntegramente a sus consumidores. Motivado en esta reforma legal, este artculo analiza el equilibrio que resulta de una subasta hipottica en que una empresa distribuidora contratara su

  17. Para lle l Support Vector Mach ines: The Cascade SVM

    E-print Network

    Bottou, Lon

    Para lle l Support Vector Mach ines: The Cascade SVM Hans Peter Graf, Eric Cosatto, Leon Bottou, leonb, igord, vlad}@neclabs.com Abstract We describe an algorithm for support vector machines (SVM in a `Cascade' of SVMs, until the global optimum is reached. The Cascade SVM can be spread over multiple

  18. LIMITAES LOGSTICAS PARA EXPORTAO: O CASO DOS PRODUTOS LCTEOS BRASILEIROS

    Microsoft Academic Search

    Adriano Abreu Rezende; Antonio Carlos dos Santos

    2008-01-01

    O propsito desta pesquisa avaliar a estrutura do agribusiness do leite no Brasil, identificando as principais limitaes logsticas para exportao. Especificamente pretende identificar as principais empresas exportadoras de produtos lcteos, os produtos mais exportados e os pases de destino; relatar as maneiras mais freqentes de insero dos produtos no mercado externo; e mencionar as estruturas fsicas utilizadas pelas empresas

  19. Mtricas de Funcionalidad: una taxonoma para sistemas Web

    E-print Network

    Guerrero, Luis

    Muy poco de lo aprendido en ingeniería de software, se aplica en el desarrollo de sistemas Web. Esto, métricas para aplicaciones Web, aplicaciones/sitios Web. 1. Introducción El desarrollo y crecimiento del desarrollo de sitios y aplicaciones Web está caracterizado por cuatro importantes factores: (1) las

  20. Tcnicas grupales para identificacin de valores en estudiantes de estomatologa

    Microsoft Academic Search

    Nivia Ernestina Snchez Fernndez

    2011-01-01

    Se realiz un estudio descriptivo transversal en el Centro Universitario Municipal Julio A. Mella de Guantnamo, curso escolar 2010-2011, con el objetivo de identificar los valores en los estudiantes de primer ao de la carrera de Estomatologa a travs de tcnicas grupales. El universo de estudio 19 estudiantes. Se utilizaron tres tcnicas grupales. La primera para aumentar el entendimiento y

  1. American Indian/Alaskan Native Undergraduate Retention at Predominantly White Institutions: An Elaboration of Tinto's Theory of College Student Departure

    ERIC Educational Resources Information Center

    Lee, Junghee; Donlan, William; Brown, Eddie F.

    2011-01-01

    This article reports findings from a major public university sponsored study undertaken with the intention of (a) improving university understanding of factors affecting American Indian/Alaskan Native (AI/AN) undergraduates' persistence at this institution, and (b) identifying in what areas, and in what manner, this institution could improve

  2. Mars Analog Rio Tinto Experiment (MARTE): An Experimental Demonstration of Key Technologies for Searching for Life on Mars

    NASA Technical Reports Server (NTRS)

    Stoker, Carol

    2004-01-01

    The discovery of near surface ground ice by the Mars Odyssey mission and the abundant evidence for recent Gulley features observed by the Mars Global Surveyor mission support longstanding theoretical arguments for subsurface liquid water on Mars. Thus, implementing the Mars program goal to search for life points to drilling on Mars to reach liquid water, collecting samples and analyzing them with instrumentation to detect in situ organisms and biomarker compounds. Searching for life in the subsurface of Mars will require drilling, sample extraction and handling, and new technologies to find and identify biomarker compounds and search for living organisms.

  3. NCI Anuncia Contribuciones para Incrementar Acceso de Minoras a Informacin sobre el Cncer

    Cancer.gov

    El Instituto Nacional del Cncer (NCI) anunci este mes una variedad de contribuciones que totalizan casi 1 milln de dlares para ayudar a desarrollar la investigacin y programas para comprender y finalmente romper la Divisin Digital que existe en muchas poblaciones minoritarias para el acceso y uso de la informacin sobre el cncer disponible en la Internet. Las contribuciones son un esfuerzo del Servicio de Informacin sobre el Cncer (CIS), dependiente de la NCI, para trabajar con grupos y organizaciones regionales para el control del cncer para probar estrategias destinadas a aumentar las comunicaciones sobre el cncer en comunidades deficientemente atendidas

  4. Zoneamento de riscos climticos para a cultura de milho na Regio Centro-Oeste do Brasil e para o estado de Minas Gerais Climatic risks zoning for maize production in West-Center Region and in Minas Gerais state, Brazil

    Microsoft Academic Search

    Luiz Marcelo Aguiar Sans; Eduardo Delgado Assad; Daniel Pereira Guimares; Gisela Avellar

    2001-01-01

    Resumo - Para a cultura de milho, a gua um fator limitante, principalmente, na fase de germinao e nos perodos de florao e enchimento de gros. Desta forma, conhecer os elementos climticos uma estratgia para definir manejos que possibilitem minimizar riscos climticos, contribuindo para melhorar a poltica de alocao de recursos para crdito agrcola e para o aumento

  5. Um satlite brasileiro para observao do dimetro solar

    NASA Astrophysics Data System (ADS)

    Emilio, M.; Leister, N. V.; Benevides Soares, P.; Teixeira, R.; Kuhn, J.

    2003-08-01

    Propomos uma misso espacial para medir a forma e o dimetro solar com o objetivo de ajudar a determinar o potencial gravitacional do Sol e a sua rotao com preciso, testar modelos tericos de variao de energia e pela primeira vez medir os modos g de oscilao. As observaes sero obtidas atravs do instrumento denominado APT (Astrometric and Photometric Telescope) descrito por Kuhn(1983). A sensibilidade do instrumento de 0,2 mas em 27 dias para as observaes do dimetro solar feitas a cada minuto. Esta uma misso de trs anos de durao e pode complementar as medidas que sero feitas pelo satlite PICARD (a ser lanado em 2007). Outros parmetros fsicos podem ser obtidos com as mesmas imagens o que certamente interessar comunidade de fsica solar. Um primeiro contato foi realizado com a agncia espacial brasileira que pretende lanar um satlite cientfico a cada dois anos.

  6. Para-Sasakian geometry in thermodynamic fluctuation theory

    NASA Astrophysics Data System (ADS)

    Bravetti, A.; Lopez-Monsalvo, C. S.

    2015-03-01

    In this work we tie concepts derived from statistical mechanics, information theory and contact Riemannian geometry within a single consistent formalism for thermodynamic fluctuation theory. We derive the concrete relations characterizing the geometry of the thermodynamic phase space stemming from the relative entropy and the FisherRao information matrix. In particular, we show that the thermodynamic phase space is endowed with a natural para-contact pseudo-Riemannian structure derived from a statistical moment expansion which is para-Sasaki and ?-Einstein. Moreover, we prove that such manifold is locally isomorphic to the hyperbolic Heisenberg group. In this way we show that the hyperbolic geometry and the Heisenberg commutation relations on the phase space naturally emerge from classical statistical mechanics. Finally, we argue on the possible implications of our results.

  7. ANEXO DELIBERAO 01/2010 AUTORIZAO PARA PUBLICAO DE

    E-print Network

    Rodriguez, Noemi

    a publicar na rede mundial de computadores (Internet), na Biblioteca virtual da PUC-Rio, entendendo-se os certificação da obra. 2 [ ] AUTORIZO a disponibilização completa a partir de 01 (um) ano após a data da, agradecimentos, resumo, sumário. Entendo que uma nova extensão por mais 01 (um) ano para a publicação digital só

  8. The rotational excitation of methanol by para-hydrogen

    Microsoft Academic Search

    J. T. Pottage; D. R. Flower; Stephen L. Davis

    2004-01-01

    In this paper, we present the results of calculations of cross-sections and rate coefficients for rotationally inelastic transitions in methanol (CH3OH), in its ground torsional state, induced by collisions with para-H2 in its ground rotational state. The interaction potential was calculated by means of many-body perturbation theory, and the corresponding cross-sections computed using the coupled states approximation to the Schrdinger

  9. Ultrafast photogeneration mechanisms of triplet states in para-hexaphenyl

    Microsoft Academic Search

    C. Zenz; G. Cerullo; G. Lanzani; W. Graupner; F. Meghdadi; G. Leising; S. de Silvestri

    1999-01-01

    We present femtosecond pump-probe measurements, both conventional and electric field-assisted, on organic light-emitting devices based on para-hexaphenyl. The dominant triplet exciton generation mechanism is assigned to nongeminate bimolecular recombination of photogenerated, spin-12 polarons. This process is active within a few hundred femtoseconds after photoexcitation and involves about 20% of the initially excited states. At higher photoexcitation densities, we observe an

  10. arquivo Proposta de regras e tabela para progresso funcional

    E-print Network

    Floeter, Sergio Ricardo

    reconhecidos publicamente (arxiv.org, por exemplo). Livros - Pontuam-se livros e capítulos de livros por artigos e livros pontuam por obra. Nesse caso, aceita-se o comprovante de emissão de parecer emitido pelo editor do jornal, revista ou livro. Assessoria ad-hoc para órgãos de fomento pontuam por emissão de

  11. Linguagens para Programac~ao Paralela October 26, 2010

    E-print Network

    Rodriguez, Noemi

    estruturas de dados Linguagens para Programa¸c~ao Paralela #12;flat data-parallelism: HPF/Fortran90 opera 1.0 to each element of A A = SQRT(A) ! Computes square root of each element of A L = A .EQ. B ! Sets¸c~ao Paralela #12;Exemplo F77 C diferen¸cas finitas program f77_finite_diff real X(100,100), New(100,100) do i

  12. Linguagens para Programac~ao Paralela November 26, 2009

    E-print Network

    Rodriguez, Noemi

    estruturas de dados Linguagens para Programa¸c~ao Paralela #12;flat data-parallelism: HPF/Fortran90 opera 1.0 to each element of A A = SQRT(A) ! Computes square root of each element of A L = A .EQ. B ! Sets¸c~ao Paralela #12;Exemplo F77 C diferen¸cas finitas program f77_finite_diff real X(100,100), New(100,100) do i

  13. Relativistic treatment of ortho-para-H2 transitions

    NASA Astrophysics Data System (ADS)

    Dodelson, Scott

    1986-09-01

    The rate for radiative decay from ortho- to para-H2 is calculated using the quantum electrodynamical method of Feinberg and Sucher (1971). The calculation is greatly simplified by switching to the dipole length form while the fields are still second quantized. The rate, about 10 to the -12th/a, differs only slightly from that calculated by Raich and Good (1964) and is small enough to be neglected even in interstellar space.

  14. ACOR hibrido con multiples colonias para problemas de optimizacion continua

    E-print Network

    Granada, Universidad de

    tiempo. Este tipo de algo- ritmo se conoce com´unmente como un m´etodo multi- colonia. El objetivo de la este tipo de algoritmos hacia un m´etodo multi-colonia para incrementar la capacidad de ex- ploraci, y los m´etodos de BL utilizados, SW y Simplex. En la Secci´on IV se ex- plica como se hace la

  15. Uma simulao do QuicktimeVR para mundos poligonais

    E-print Network

    a tecnologia de image-based rendering para realidade virtual. Essa abordagem consiste em se obter um número de ressaltar que a tecnologia de image-based rendering se propõe a reconstruir visões do ambiente e não o ambiente propriamente dito. #12;3 Essa tecnologia no entanto é relativamente nova e muito ainda há que ser

  16. Nuclear Quadrupole Resonance Zeeman Study of paraChlorophenol

    Microsoft Academic Search

    G. E. Peterson; P. M. Bridenbaugh

    1967-01-01

    The major field gradient directions for Cl in para-chlorophenol as determined by NQR and x-ray diffraction are compared quantitatively, and found to agree. The minor field gradient directions are examined qualitatively, and are consistent with those predicted on the basis of Cl&sngbnd;C partial double bonding. From a measurement of the field gradient asymmetry parameter &eegr;, the degree of chlorinecarbon double

  17. Un API para el desarrollo de aplicaciones paralelas 100% Java

    E-print Network

    Giménez, Domingo

    Un API para el desarrollo de aplicaciones paralelas 100% Java Antonio Talón Toledo 5º curso de://www.cs.rit.edu/~ark/pj.shtml) · PJ es software libre que se distribuye bajo los términos de la GNU General Public License (http sobre un cluster #12;· Web del autor: http://www.cs.rit.edu/~ark/pj.shtml · Descargas: binario y fuentes

  18. Edukalibre: una herramienta para la creacion colaborativa de material didactico

    Microsoft Academic Search

    Diego Chaparro; Teofllo Romera

    El Software Libre, con sus caractersticas y su particular modelo de desarrollo, ha permitido la creacion de un conjunto de metodologas de trabajo en grupo que han resultado satisfactorias en gran cantidad diferentesambitos. En este sentido, el proyecto Edukalibre importa y adapta estas metodologas para ser aplicadas en la creacion y man- tenimiento de documentacion en elambito de la educacion.

  19. Consistent Assignment of the Vibrations of Para Disubstituted Benzene Molecules

    NASA Astrophysics Data System (ADS)

    Andrejeva, Anna; Lee, Alison Jasmin; Wright, Tim

    2014-06-01

    When disubstituted benzene molecules are considered the relative position of the substituents must be defined. The three possible forms are ortho-, meta-, and para- where the latter is investigated in this work by consideration of the effect para positioned substituents will have on the vibrational modes. The consistency of the labelling and assignment of the vibrational frequencies of the para disubstituted benzene molecules is investigated in their ground states (S0) and first electronically excited states (S1). The work extends a previously published nomenclature where ring-localised vibrations are compared straightforwardly across different monosubstituted benzene species and given the label Mi. The assignments of the frequencies include previous work but also the calculated wavenumbers for both hydrogenated disubstituted benzenes (-h4) and the deuterated isotopologues (-d4) employing density functional theory (DFT) and time-dependent density functional theory (TDDFT). A. M. Gardner and T. G. Wright, J. Chem. Phys., 135, 114305 (2011) A. M. Gardner, A. M. Green, V. M. Tame-Reyes, V. H. K. Wilton and T. G. Wright, 138, 134303 (2013) A. M. Gardner, A. M. Green, V. M. Tame-Reyes, K. L. Reid, J. A. Davies, V. H. K. Wilton and T. G. Wright, manuscript accepted

  20. Determination of the Ratio of Ortho Hydrogen and Para Hydrogen

    NASA Astrophysics Data System (ADS)

    Zhou, D.; Ihas, G. G.; Sullivan, N. S.

    2003-03-01

    The two different quantum states of hydrogen, ortho-hydrogen and para-hydrogen, possess different properties. The accurate determination of the ortho/para ratio in gaseous, liquid and solid state is important both for research needs and for applications in cryogenic engineering, such as H2 production, transport and storage. NMR can determine the ratio1 accurately, but it is cumbersome and often not practical. Cryogenic applications need a simple and reliable method. We report on the development of a thermal conductivity gauge employing a pure metal thin film that serves as both heater and thermometer for the detection of ortho-para hydrogen ratios in the gaseous state. This ratio-meter has been tested and found to have a nearly pressure-independent voltage response over a broad pressure range with a constant current. The thermal conductivity of hydrogen and nitrogen was measured and found to agree quantitatively with published data. The new development will be presented. *Thanks to Larry Phelps, Bill Malphurs, Stephen Wood, David Hernandez. # Supported by NASA Contract NAG3-2750 Ref. 1. D. Zhou, C. M. Edwards, and N. S. Sullivan, Phys. Rev. Lett. 62, 1528 (1989)

  1. Consejos para los efectos de la quimioterapia: Cambios en la memoria

    Cancer.gov

    Provee consejos prcticos para las personas que estn reflejando cambios en la memoria durante la quimioterapia. Enumera sntomas que requieren que se comuniquen con su mdico o enfermera e incluye preguntas para su mdico o enfermera.

  2. Taller de Ciencia para J ovenes CIMAT, 20-31 julio, 1998

    E-print Network

    Bor, Gil

    ~nar los cursos de \\Ciencia para J#19;ovenes'' para alumnos de escuelas preparatorias en los a~nos 1997 of Numbers", por L. E. Dickson (The Uni- versity of Chicago Press, 1947). Un cl#19;asico del tema. Todos

  3. 1/4 CBEB 2008 SISTEMA PARA ESTIMAO DE INTENO DE MOVIMENTO EM

    E-print Network

    Carvalho, Joo Luiz

    2008 para a prtese, a coordenao entre os micro-controladores escravos para fazer medies de diferentes variveis, e a gerao de trajetrias de juntas. Os micro-controladores escravos utilizados so d

  4. Pitones Birmanas en Florida del Sur: Soporte Cientfico para el Manejo de Especies Invasoras1

    E-print Network

    Mazzotti, Frank

    clasificada por la Unin Internacional para la Conservacin como "casi amenazada" en su rango nativo en el Sureste de Asia, debido a su exportacin para el comercio como mascota y a la cacera por su piel. Miles

  5. El Centro para la Salud Mundial del NCI anuncia las primeras becas de investigacin para apoyar las tecnologas porttiles

    Cancer.gov

    El Centro para la Salud Mundial del NCI (CGH) anunci el otorgamiento de subvenciones que apoyarn el desarrollo y la validacin de tecnologas porttiles y de bajo costo. Estas tecnologas tienen el potencial de mejorar la deteccin temprana, el diagnstico y los tratamientos no invasivos o mnimamente invasivos de varios tipos de cncer con una prevalencia particularmente alta en ciertos pases con economas de ingreso bajo y mediano.

  6. A study of the valence shell electronic structure and photoionisation dynamics of para-dichlorobenzene and para-bromochlorobenzene

    NASA Astrophysics Data System (ADS)

    Powis, I.; Trofimov, A. B.; Bodzuk, I. L.; Holland, D. M. P.; Potts, A. W.; Karlsson, L.

    2013-03-01

    The valence shell electronic structure and photoionisation dynamics of para-dichlorobenzene and para-bromochlorobenzene have been investigated both experimentally and theoretically. High resolution photoelectron spectra of the outer valence orbitals have been recorded with HeI radiation and the observed structure has been interpreted using calculated ionisation energies and spectral intensities. The theoretical predictions for the single-hole ionic states due to outer valence ionisation agree satisfactorily with the experimental results. Ionisation from the inner valence orbitals is strongly influenced by many-body effects and the with a particular orbital is spread amongst numerous satellites. Some of the photoelectron bands exhibit vibrational progressions and tentative assignments have been proposed. The photoionisation dynamics of the outer valence orbitals of para-dichlorobenzene have been investigated theoretically by using the continuum multiple scattering approach to calculate photoionisation partial cross-sections and photoelectron anisotropy parameters. The results show that ionisation from some of the orbitals is affected by the Cooper minimum associated with the chlorine atom. Synchrotron radiation has been used to record angle resolved photoelectron spectra of the entire valence shell, for photon energies between threshold and 100 eV, and these have allowed the corresponding experimental data to be derived. A comparison between the predicted and measured anisotropy parameters confirms the influence of the Cooper minimum in those orbitals related to the chlorine lone-pairs.

  7. Zeeman Effect of the Nuclear Quadrupole Resonance of 81Br in para-Bromophenol and 35Cl in paraChlorophenol

    Microsoft Academic Search

    P. Bucci; P. Cecchi; A. Colligiani

    1969-01-01

    The Zeeman effect of the 81Br and 35Cl nuclear quadrupole resonance has been studied with high precision on single crystals of para-bromophenol and para-chlorophenol, respectively. The results substantially agree with previous x-ray and NQR studies of para-chlorophenol (x-ray studies are known only for this substance). In p-bromophenol, four physically inequivalent sites were found, instead of two, as reported by other

  8. Um Framework para a Simulao de Redes Mveis Ad hoc Alexandre Mele & Markus Endler

    E-print Network

    Endler, Markus

    Um Framework para a Simulao de Redes Mveis Ad hoc Alexandre Mele & Markus Endler Departamento de, um framework flexvel para a prototipao e simulao de protocolos para redes mveis ad hoc. Depois.11. Palavras-chave Redes Mveis Ad hoc, Framework, Simulao, Roteamento, Prototipao de Protocolos #12;Um

  9. Fondos del SBIR para el desarrollo de tecnologas de imgenes ms avanzadas

    Cancer.gov

    El Programa de Investigacin de la Innovacin de la Pequea Empresa (SBIR), junto con el Programa de Transferencia Tecnolgica para la Pequea Empresa (STTR), son los motores del NCI para la creacin y comercializacin de nuevas tecnologas para prevenir, diagnosticar y tratar el cncer.

  10. Notas para un curso de introduccion a la Teoria de Numeros

    E-print Network

    Bor, Gil

    ´i inicialmente para acompa~nar los cursos de "Ciencia para J´ovenes" para alumnos de escuelas preparatorias en traducido al espa~nol. "Modern Elementry Theory of Numbers", por L. E. Dickson (The Univer- sity of Chicago

  11. Un Sistema de Control de Acceso para la Distribucin de Contenidos Multimedia

    E-print Network

    Sánchez Cuenca, Manuel

    para aplicar una calidad de servicio (QoS) adecuada. Aunque el control de acceso es una característicaUn Sistema de Control de Acceso para la Distribución de Contenidos Multimedia M. Sánchez1 , G que se intercambie la información necesaria para realizar las tareas de control de acceso, así como

  12. Propuesta de autorizacin para entornos Grid basada en la arquitectura NAS-SAML

    E-print Network

    Snchez Cuenca, Manuel

    Propuesta de autorizacin para entornos Grid basada en la arquitectura NAS-SAML Manuel Snchez1 que acceden a sus recursos. Se han propuesto varias arquitecturas de autorizacin para este tipo de como un recurso ms. La arquitectura AAA fue diseada para resolver este problema usando diferentes

  13. PLANIFICACIN COLABORATIVA Y UBICUA PARA EL APRENDIZAJE DEL DISEO EN EL SISTEMA DOMOSIM-TPC

    Microsoft Academic Search

    Miguel A. Redondo; Ana I. Molina; Crescencio Bravo; Jos Bravo; Manuel Ortega

    Resumen En este artculo, como punto de partida, describimos parte de nuestra experiencia en un caso de estudio particular y sobre un e scenario real en el que se trabaja para resolver una cierta problemtica asociada al aprendizaje del diseo domtico. Para este caso de estudio desarrollamos un sistema para el aprendizaje colaborativo basado en los paradigmas de interaccin asistida

  14. Aplicacin del Teorema de Nekhorochev para tiempos de estabilidad en Mecnica Celeste

    Microsoft Academic Search

    O. Miloni; J. Nez; A. Brunini

    1999-01-01

    En Mecnica Celeste, uno de los problemas centrales consiste en la determinacin de los tiempos de estabilidad. El teorema de Nekhorochev proporciona un mtodo para dicho estudio, para un sistema determinado por un hamiltoniano descripto en las variables accin-ngulo. El trabajo consiste en la acotacin tanto del potencial perturbador y de la matriz hessiana del hamiltoniano integrable para determinar luego

  15. Accesibilidad para personas con debilidad auditiva Mac OS X Snow Leopard

    E-print Network

    Fernndez de Crdoba, Pedro

    Accesibilidad para personas con debilidad auditiva Mac OS X Snow Leopard ASIC 18 de noviembre de LEOPARD MAC OS X Snow Leopard ofrece algunas ayudas para personas sordas o con problemas para escuchar Snow Leopard ASIC 18 de noviembre de 2010 Pg. 2 de 14 1. Recomendaciones previas frente al uso del

  16. Accesibilidad para personas con debilidad motriz Mac Os X Snow Leopard

    E-print Network

    Fernndez de Crdoba, Pedro

    Accesibilidad para personas con debilidad motriz Mac Os X Snow Leopard ASIC 18 de noviembre de LEOPARD Si usted tiene problemas para utilizar el teclado, el ratn o el trackpad de su porttil, puede para personas con debilidad motriz Mac Os X Snow Leopard ASIC 18 de noviembre de 2010 Pg. 2 de 9

  17. ParA resolvase catalyzes site-specific excision of DNA from the Arabidopsis genome

    Technology Transfer Automated Retrieval System (TEKTRAN)

    The small serine resolvase ParA from bacterial plasmids RK2 and RP4 catalyzes the recombination of two identical 133 bp recombination sites known as MRS. Previously, we reported that ParA is active in the fission yeast Schizosaccharomyces pombe. In this work, the parA recombinase gene was placed un...

  18. Females prefer carotenoid colored males as mates in the pentamorphic livebearing fish, Poecilia parae

    Microsoft Academic Search

    Godfrey R. Bourne; Felix Breden; Teresa C. Allen

    2003-01-01

    The first results of female preference and chosen male mating success in a new model organism, the pentamorphic livebearing fish, Poecilia parae, are presented. Poecilia parae is a relative of the guppy, P. reticulata, and is assumed to have similar reproductive behavior. We tested the hypothesis that P. parae females, like female guppies, prefer caretenoid colored males as mates. Here

  19. REDES TRANSACIONALES: APORTES PARA LA LECTURA SOBRE EL CASO AMERICANO DE LA ALIANZA SOCIAL CONTINENTAL

    E-print Network

    Paris-Sud XI, Universit de

    del rea de Libre Comercio para las Amricas (ALCA) desarrollada por un novedoso actor transnacional y recomposicin sindical a nivel internacional. Estas cuestiones resultan cardinales para comprender el relieve al proyecto del rea de Libre Comercio para las Amricas (ALCA) en el continente americano. Con este

  20. ANLISIS DE RBOL DE FALLAS DEL SISTEMA DE UNA LLAVE PARA AGUA

    Microsoft Academic Search

    Rosalva Martnez Aguilar; Jos Francisco Rodrguez Silva

    2007-01-01

    La competitividad en las organizaciones es un factor primordial para su permanencia y desarrollo en el mercado. Para ello, los procesos de fabricacin y los productos se monitorean constantemente incluso cuando estn en su fase de diseo para asegurar la calidad que los clientes exigen. Los costos generados por reparaciones en las instalaciones del cliente o por la salida de

  1. Buenas prcticas para la digitalizacin de documentos destinados al repositorio Digital.CSIC

    E-print Network

    prcticas para la digitalizacin de documentos en el repositorio institucional Digital.CSIC: digitalizacin1 Buenas prcticas para la digitalizacin de documentos destinados al repositorio Digital instituciones culturales disponen de escneres de mesa para uso interno del personal o de autoservicio, como

  2. Cmo cuidarse mientras usted cuida a su ser querido: Apoyo para personas que cuidan a un ser querido con cncer

    Cancer.gov

    Un folleto para las personas responsables del cuidado de un ser querido que recibe tratamiento para el cncer. Ofrece informacin prctica y apoyo para ayudarlas a sobrellevar este perodo difcil y estresante.

  3. Amazon Land Wars in the South of Para

    NASA Technical Reports Server (NTRS)

    Simmons, Cynthia S.; Walker, Robert T.; Arima, Eugenio Y.; Aldrich, Stephen P.; Caldas, Marcellus M.

    2007-01-01

    The South of Para, located in the heart of the Brazilian Amazon, has become notorious for violent land struggle. Although land conflict has a long history in Brazil, and today impacts many parts of the country, violence is most severe and persistent here. The purpose of this article is to examine why. Specifically, we consider how a particular Amazonian place, the so-called South of Para has come to be known as Brazil's most dangerous badland. We begin by considering the predominant literature, which attributes land conflict to the frontier expansion process with intensified struggle emerging in the face of rising property values and demand for private property associated with capitalist development. From this discussion, we distill a concept of the frontier, based on notions of property rights evolution and locational rents. We then empirically test the persistence of place-based violence in the region, and assess the frontier movement through an analysis of transportation costs. The findings from the analyses indicate that the prevalent theorization of frontier violence in Amazonia does little to explain its persistent and pervasive nature in the South of Para. To fill this gap in understanding, we develop an explanation based the geographic conception of place, and we use contentious politics theory heuristically to elucidate the ways in which general processes interact with place specific history to engender a landscape of violence. In so doing, we focus on environmental, cognitive, and relational mechanisms (and implicated structures), and attempt to deploy them in an explanatory framework that allows direct observation of the accumulating layers of the region's tragic history. We end by placing our discussion within a political ecological context, and consider the implications of the Amazon Land War for the environment.

  4. ORTHO-PARA SELECTION RULES IN THE GAS-PHASE CHEMISTRY OF INTERSTELLAR AMMONIA

    SciTech Connect

    Faure, A.; Hily-Blant, P.; Le Gal, R.; Rist, C. [UJF-Grenoble 1/CNRS-INSU, Institut de Planetologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, Grenoble F-38041 (France); Pineau des Forets, G., E-mail: afaure@obs.ujf-grenoble.fr [Institut d'Astrophysique Spatiale, Universite Paris-Orsay and CNRS, Orsay (France)

    2013-06-10

    The ortho-para chemistry of ammonia in the cold interstellar medium is investigated using a gas-phase chemical network. Branching ratios for the primary reaction chain involved in the formation and destruction of ortho- and para-NH{sub 3} were derived using angular momentum rules based on the conservation of the nuclear spin. We show that the 'anomalous' ortho-to-para ratio of ammonia ({approx}0.7) observed in various interstellar regions is in fact consistent with nuclear spin selection rules in a para-enriched H{sub 2} gas. This ratio is found to be independent of temperature in the range 5-30 K. We also predict an ortho-to-para ratio of {approx}2.3 for NH{sub 2}. We conclude that a low ortho-to-para ratio of H{sub 2} naturally drives the ortho-to-para ratios of nitrogen hydrides below the statistical values.

  5. Do Well, Be Well with Diabetes 2013 1 Formulario de Conclusin para Personas con Diabetes Formulario de Conclusin para Personas con Diabetes 201

    E-print Network

    Do Well, Be Well with Diabetes ­ 2013 1 Formulario de Conclusión para Personas con Diabetes Formulario de Conclusión para Personas con Diabetes ­ 201 Si usted NO TIENE diabetes, por favor NO LLENE este últimos cuatro números de mi número telefónico son __ __ __ __. C. Marque todas las clases sobre diabetes

  6. Do Well, Be Well with Diabetes 2013 1 Formulario de Registro para Personas con Diabetes Formulario de Registro para Personas con Diabetes 2013

    E-print Network

    Do Well, Be Well with Diabetes ­ 2013 1 Formulario de Registro para Personas con Diabetes Formulario de Registro para Personas con Diabetes ­ 2013 Si usted NO TIENE diabetes, por favor NO LLENE este sobre diabetes en el Condado de _______________. D. El código postal en mi casa es __ __ __ __ __. E

  7. Una propuesta para el dise~no de m'etodos de Jacobi unilaterales por bloques para el Problema Sim'etrico de Valores Propios \\Lambda

    E-print Network

    Giménez, Domingo

    los tiempos de ejecuci'on te'oricos con los de un m'etodo bilateral por bloques. Palabras clave: m'etodosUna propuesta para el dise~no de m'etodos de Jacobi unilaterales por bloques para el Problema Sim'etrico de Valores Propios. Se estudian dos m'etodos secuenciales y sus versiones paralelas, y se comparan

  8. The infrared dielectric function of solid para-hydrogen

    E-print Network

    Kettwich, Cassie; Walker, Mark; Tuntsov, Artem

    2015-01-01

    We report laboratory measurements of the absorption coefficient of solid para-H2, within the wavelength range from 1 to 16.7 micron, at high spectral resolution. In addition to the narrow rovibrational lines of H2 which are familiar from gas phase spectroscopy, the data manifest double transitions and broad phonon branches that are characteristic specifically of hydrogen in the solid phase. These transitions are of interest because they provide a spectral signature which is independent of the impurity content of the matrix. We have used our data, in combination with a model of the ultraviolet absorptions of the H2 molecule, to construct the dielectric function of solid para-H2 over a broad range of frequencies. Our results will be useful in determining the electromagnetic response of small particles of solid hydrogen. The dielectric function makes it clear that pure H2 dust would contribute to IR extinction predominantly by scattering starlight, rather than absorbing it, and the characteristic IR absorption s...

  9. Para-Sexiphenyl Layers Grown On Light Sensitive Polymer Substrates

    NASA Astrophysics Data System (ADS)

    Hernandez-Sosa, G.; Simbrunner, C.; Hfler, T.; Moser, A.; Werzer, O.; Kunert, B.; Trimmel, G.; Kern, W.; Resel, R.; Sitter, H.

    In this contribution the deposition of Para-sexiphenyl (PSP) layers on poly (diphenyl bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylate) (PPNB) by Hot Wall Epitaxy (HWE) is reported. It is demonstrated that pre-treating the substrate by UV-illumination induces a clear change in the morphology of the grown PSP films due to the polarity modification of the substrate surface. PPNB surface polarity increases when illuminated by UV via photo-Fries rearrangement. By detailed atomic force microscopy analysis the influence on the growth kinetics by the substrate temperature, deposition time and particularly by the UVtreatment of the substrate was investigated. A high crystalline order of the films is underlined by the observation of growth spirals and terraced islands, providing mono-layer step heights of standing PSP-molecules.

  10. Photophysics of Isolated Nanostructured Poly(para-phenylenevinylene)

    NASA Astrophysics Data System (ADS)

    List, Emil J. W.; Partee, Jonathan; Shinar, Joseph; Zojer, Egbert; Markart, P.; Gadermaier, Christoph; Leising, Guenther; Smith, R.; Gin, D.; Graupner, Wilhelm

    2000-03-01

    The photophysics of bulk poly(para-phenylenevinylene) (PPV) films are compared to those of isolated PPV chains incorporated into a self-assembled lyotropic liquid-crystalline matrix ordered at the nanometer scale (nano-PPV). As expected, the optical spectra and the spectral dependence of the photoluminescence (PL)-detected magnetic resonance (PLDMR) show that the nano-PPV structure largely eliminates the interchain charge transfer excitons, allowing only intrachain migration of singlet excitons (SEs). The observed unusual sublinear dependence of the PL on the excitation density in nano-PPV indicates that these SEs are strongly nonradiatively quenched at trapped polarons. A rate-equation model based on this quenching mechanism provides strong evidence that this quenching process is responsible for the polaron PLDMR. *Operated by ISU for the USDOE under Contract W-7405-Eng-82.

  11. Technique to match mantle and para-aortic fields

    SciTech Connect

    Lutz, W.R.; Larsen, R.D.

    1983-11-01

    A technique is described to match the mantle and para-aortic fields used in treatment of Hodgkin's disease, when the patient is treated alternately in supine and prone position. The approach is based on referencing the field edges to a point close to the vertebral column, where uncontrolled motion is minimal and where accurate matching is particularly important. Fiducial surface points are established in the simulation process to accomplish the objective. Dose distributions have been measured to study the combined effect of divergence differences, changes in body angulation and setup errors. Even with the most careful technique, the use of small cord blocks of 50% transmission is an advisable precaution for the posterior fields.

  12. ParaText : scalable text analysis and visualization.

    SciTech Connect

    Dunlavy, Daniel M.; Stanton, Eric T.; Shead, Timothy M.

    2010-07-01

    Automated analysis of unstructured text documents (e.g., web pages, newswire articles, research publications, business reports) is a key capability for solving important problems in areas including decision making, risk assessment, social network analysis, intelligence analysis, scholarly research and others. However, as data sizes continue to grow in these areas, scalable processing, modeling, and semantic analysis of text collections becomes essential. In this paper, we present the ParaText text analysis engine, a distributed memory software framework for processing, modeling, and analyzing collections of unstructured text documents. Results on several document collections using hundreds of processors are presented to illustrate the exibility, extensibility, and scalability of the the entire process of text modeling from raw data ingestion to application analysis.

  13. Nuevos sistemas de frecuencia intermedia para el IAR

    NASA Astrophysics Data System (ADS)

    Olalde, J. C.; Perilli, D.; Larrarte, J. J.

    Se presenta el diagrama en bloques de los nuevos sistemas de Frecuencia Intermedia para los dos radimetros instalados en el IAR. Entre las caractersticas ms importantes del sistema podemos mencionar la posibilidad de conectar cualquiera de las dos antenas a los ``backend" disponibles: analizador espectral de alta resolucin (META II) de 0,05 Hz, autocorrelador de 1008 canales y contnuo. Se incorporan al sistema nuevos sintetizadores de frecuencia implementados con PLL y la moderna tcnica de sntesis digital directa. Por ltimo, el conjunto del sistema es susceptible de ser configurado por las computadoras de adquisicin de datos, supervisadas por otra, que entrega el estado de funcionamiento actual y evita la seleccin de configuraciones incorrectas por parte del usuario.

  14. Procedimento para utilizar a assinatura do IB no Webmail 1) Acesse a sua conta no webmail;

    E-print Network

    Morandini, Andre C.

    1/5 Procedimento para utilizar a assinatura do IB no Webmail 1) Acesse a sua conta no webmail; 2 clique no ícone imagem; 8) Na tela seguinte, digite a seguinte URL da imagem: www.ib.usp.br/webmail/assinatura.jpg A imagem da assinatura do IB será exibida. Clique em OK para voltar para a tela de configuração e salve

  15. The existence of all three ParaHox genes in the clitellate annelid, Perionyx excavatus

    Microsoft Academic Search

    Bum Joon Park; Sung-Jin Cho; Eun Sik Tak; Bo Eun Lee; Soon Cheol Park

    2006-01-01

    A ParaHox gene cluster is composed of three genes (Gsx, Xlox, and Cdx). It has been proposed that all three ParaHox genes were present in the last common ancestor to the lophotrochozoan protostomes and the deuterostomes and that gene loss event has occurred in the ecdysozoan lineage. In this paper, we report the existence of all three ParaHox genes in

  16. Nueva opcin de tratamiento para mujeres jvenes con cncer de seno sensible a las hormonas

    Cancer.gov

    Un frmaco usado para el tratamiento del cncer de seno (mama), conocido como exemestano, es ms eficaz que tamoxifeno, un frmaco preventivo de uso comn para el cncer de seno, en la prevencin de la recidiva del cncer de seno en mujeres jvenes que tambin reciben tratamiento posoperativo para suprimir el funcionamiento ovrico. Los resultados de este estudio se presentaron en mujeres que tenan un tipo de cncer de seno en estadio inicial sensible al tratamiento hormonal.

  17. Tcnicas de Investigacin y Manejo para la Conservacin de las Tortugas Marinas 199 Tcnicas de Investigacin y Manejo para la Conservacin de las Tortugas Marinas

    E-print Network

    Prestwich, Ken

    instalaciones y que se dispone de suficientes recursos financieros para el mantenimiento. Además deberán considerarse las siguientes advertencias: 1. Los viveros son muy costosos tanto en recursos financieros como

  18. Features of the ancestral bilaterian inferred from Platynereis dumerilii ParaHox genes

    PubMed Central

    Hui, Jerome HL; Raible, Florian; Korchagina, Natalia; Dray, Nicolas; Samain, Sylvie; Magdelenat, Ghislaine; Jubin, Claire; Segurens, Batrice; Balavoine, Guillaume; Arendt, Detlev; Ferrier, David EK

    2009-01-01

    Background The ParaHox gene cluster is the evolutionary sister to the Hox cluster. Whilst the role of the Hox cluster in patterning the anterior-posterior axis of bilaterian animals is well established, and the organisation of vertebrate Hox clusters is intimately linked to gene regulation, much less is known about the more recently discovered ParaHox cluster. ParaHox gene clustering, and its relationship to expression, has only been described in deuterostomes. Conventional protostome models (Drosophila melanogaster and Caenorhabditis elegans) are secondarily derived with respect to ParaHox genes, suffering gene loss and cluster break-up. Results We provide the first evidence for ParaHox gene clustering from a less-derived protostome animal, the annelid Platynereis dumerilii. Clustering of these genes is thus not a sole preserve of the deuterostome lineage within Bilateria. This protostome ParaHox cluster is not entirely intact however, with Pdu-Cdx being on the opposite end of the same chromosome arm from Pdu-Gsx and Pdu-Xlox. From the genomic sequence around the P. dumerilii ParaHox genes the neighbouring genes are identified, compared with other taxa, and the ancestral arrangement deduced. Conclusion We relate the organisation of the ParaHox genes to their expression, and from comparisons with other taxa hypothesise that a relatively complex pattern of ParaHox gene expression existed in the protostome-deuterostome ancestor, which was secondarily simplified along several invertebrate lineages. Detailed comparisons of the gene content around the ParaHox genes enables the reconstruction of the genome surrounding the ParaHox cluster of the protostome-deuterostome ancestor, which existed over 550 million years ago. PMID:19627570

  19. DYNA3D/ParaDyn Regression Test Suite Inventory

    SciTech Connect

    Lin, J I

    2011-01-25

    The following table constitutes an initial assessment of feature coverage across the regression test suite used for DYNA3D and ParaDyn. It documents the regression test suite at the time of production release 10.1 in September 2010. The columns of the table represent groupings of functionalities, e.g., material models. Each problem in the test suite is represented by a row in the table. All features exercised by the problem are denoted by a check mark in the corresponding column. The definition of ''feature'' has not been subdivided to its smallest unit of user input, e.g., algorithmic parameters specific to a particular type of contact surface. This represents a judgment to provide code developers and users a reasonable impression of feature coverage without expanding the width of the table by several multiples. All regression testing is run in parallel, typically with eight processors. Many are strictly regression tests acting as a check that the codes continue to produce adequately repeatable results as development unfolds, compilers change and platforms are replaced. A subset of the tests represents true verification problems that have been checked against analytical or other benchmark solutions. Users are welcomed to submit documented problems for inclusion in the test suite, especially if they are heavily exercising, and dependent upon, features that are currently underrepresented.

  20. Ab initio dynamics study of poly-para-phenylene vinylene

    NASA Astrophysics Data System (ADS)

    Zheng, Guang; Clark, S. J.; Tulip, P. R.; Brand, S.; Abram, R. A.

    2005-07-01

    We present an ab initio dynamics investigation within a density-functional perturbation theory framework of the properties of the conjugated polymer poly-para-phenylene vinylene (PPV) in both the isolated chain and crystalline states. The calculated results show that for an isolated chain, most of the vibrational modes correspond to experimentally observed modes in crystalline PPV. However, additional hitherto unidentified modes have been observed in experiment and our calculations on crystalline material have allowed us to assign these. We also present the results of calculations of the polarizability and permittivity tensors of the material, which are in reasonable agreement with the typical values for conjugated polymers. Dynamical Born effective charges [S. Baroni, S. de Gironcoli, A. Dal Corso, and P. Giannozzi, Rev. Mod. Phys. 73, 515 (2001)] are calculated and compared with atomic charges obtained from Mulliken population analysis [M. D. Segall, C. J. Pickard, R. Shah, and M. C. Payne, Mol. Phys. 89, 571 (1996)] and we conclude that effective charges are more appropriate for use in the study of the dynamics of the system. Notable differences are found in the infrared-absorption spectra obtained for the isolated chain and crystalline states, which can be attributed to the differences in the crystalline packing effects, which clearly play a key role in influencing the lattice dynamics of PPV.

  1. Para-hydrogen induced polarization in heterogeneous hydrogenationreactions

    SciTech Connect

    Koptyug, Igor V.; Kovtunov, Kirill; Burt, Scott R.; Anwar, M.Sabieh; Hilty, Christian; Han, Song-I; Pines, Alexander; Sagdeev, Renad Z.

    2007-01-31

    We demonstrate the creation and observation ofpara-hydrogen-induced polarization in heterogeneous hydrogenationreactions. Wilkinson's catalyst, RhCl(PPh3)3, supported on eithermodified silica gel or a polymer, is shown to hydrogenate styrene intoethylbenzene and to produce enhanced spin polarizations, observed throughNMR, when the reaction was performed with H2 gas enriched in the paraspinisomer. Furthermore, gaseous phase para-hydrogenation of propylene topropane with two catalysts, the Wilkinson's catalyst supported onmodified silica gel and Rh(cod)(sulfos) (cod = cycloocta-1,5-diene;sulfos) - O3S(C6H4)CH2C(CH2PPh2)3) supported on silica gel, demonstratesheterogeneous catalytic conversion resulting in large spin polarizations.These experiments serve as a direct verification of the mechanism ofheterogeneous hydrogenation reactions involving immobilized metalcomplexes and can be potentially developed into a practical tool forproducing catalyst-free fluids with highly polarized nuclear spins for abroad range of hyperpolarized NMR and MRI applications.

  2. Quadrupole Approximation for Para-Positronium in Relativistic Schrdinger Theory

    E-print Network

    M. Mattes; M. Sorg

    2011-09-11

    The non-relativistic energy levels of para-positronium are calculated in the quadrupole approximation of the interaction potential. This approximation technique takes into account the anisotropy of the electrostatic electron-positron interaction in the lowest order. The states due to different values of the quantum number $(l_z)$ of angular momentum are found to be no longer degenerate as is the case in the conventional theory. The physical origin of this elimination of the conventional degeneracy may intuitively be attributed to the state-dependent inertial \\emph{broadening} of the rotating charge clouds; the corresponding \\emph{anisotropic} deformation (in the quadrupole approximation) lowers then the negative electrostatic interaction energy. The result of this influence of anisotropy is that the states with $l_z=0$ adopt smaller binding energy whereas the states with maximal value of $|l_z|$ (for fixed principal quantum number $n$) have the largest binding energy within the angular momentum multiplet $(-|l_{z,\\mathrm{max}}| \\le l_z \\le |l_{z,\\mathrm{max}}|)$. This yields a certain kind of electric fine-structure splitting with the splitted RST levels being placed in a relatively narrow band around the (highly degenerated) conventional levels.

  3. Vibrational relaxation in jet-cooled para-alkylanilines

    NASA Astrophysics Data System (ADS)

    Powers, D. E.; Hopkins, J. B.; Smalley, R. E.

    1980-05-01

    Absorption and fluorescence spectra have been obtained for the 1B2(??*)?1A1 transition of a series of para-alkylanilines cooled in a supersonic free jet. The series consists of all p-n-alkylanilines through n-butyl- as well as p-isopropylaniline and aniline itself. For those members of the series having an alkyl chain length of three or greater, two distinct molecular conformations are found to be populated in the jet with roughly equal likelihood. Spectra of both the extended chain conformation [p-n-(t)-alkylanilines] and the coiled chain conformation [p-n-(g)-alkylanilines] show that two optically active aniline vibrations are largely unaffected by changes in the length and nature of the n-alkyl chain. One of these vibrations (the inversion motion of the -NH2 group) would be expected to be particularly weakly coupled to the torsions and bends of p-alkyl chain. Nonetheless, fluorescence spectra obtained when this vibration is excited in the 1B2 state show that intramolecular vibrational relaxation occurs into the chain modes within a nanosecond.

  4. Para-dichlorobenzene toxicity a review of potential neurotoxic manifestations

    PubMed Central

    Dubey, Divyanshu; Sharma, Vibhash D.; Pass, Steven E.; Sawhney, Anshudha

    2014-01-01

    Background: Para-dichlorobenzene (PDCB) is an active ingredient of mothballs, deodorizers and fumigants. Due to the easy availability of this chemical, there is a considerable risk for accidental or intentional toxic exposure. Recently, multiple cases of PDCB toxicity due to mothball ingestion were reported. PDCB toxicity can affect multiple organ systems including liver, kidneys, skin, lung and the central nervous system (CNS). CNS toxicity often results in leukoencephalopathy and heterogeneous neurological manifestations. Objectives: The objective of this study was to illustrate the clinical presentation, imaging findings, diagnosis and management of PDCB toxicity. Methods: We carried out a literature review of the pharmacological and toxicological properties of PDCB. Conclusions: PDCB and other aromatic hydrocarbons are capable of CNS tissue damage and in promoting functional neurological decline. While very little is currently known about prevalence of PDCB addiction, it cannot be ruled out that its illicit use among young people is under-recognized. The number of cases of PDCB toxicity might also rise due to the increasing industrial and domestic use of this chemical. PMID:24790648

  5. Analise de Mecanismos de CAC para Redes ATM Michel Ferreira Abdalla

    E-print Network

    Abdalla, Michel Ferreira

    Analise de Mecanismos de CAC para Redes ATM Michel Ferreira Abdalla Department of Computer Science~ao em redes ATM. Uma classificac~ao destes mecanismos baseada no principio implicito neles utilizado encontrar em redes ATM, estes mecanismos apre- sentam resultados bastante superestimados para a capaci- dade

  6. MiCCS4Mobile Middleware para Comunicao e Coordenao Segura em Redes Ad-hoc

    E-print Network

    Neves, Nuno

    MiCCS4Mobile Middleware para Comunicao e Coordenao Segura em Redes Ad-hoc com Participantes desenvolvimento de aplicaes mveis. Algumas aplicaes exploram protocolos de redes sem fios e a mobilidade dos dispositivos para aumentar as suas funciona- lidades. A classe de protocolos de redes sem fios com dispositivos

  7. Uma Implementac~ao Concorrente de Redes Neurais PCA para Compress~ao de Imagens

    E-print Network

    Pereira, Marcone Corra

    Uma Implementac~ao Concorrente de Redes Neurais PCA para Compress~ao de Imagens Willian Y. Honda1 dados. Considerando uma rede neural que aproxima os resultados da PCA classica, a principal contribuic~ao deste trabalho consiste em apresentar um modelo de implementac~ao concorrente para essa rede. Um estudo

  8. Opciones de ciruga para mujeres con CDIS o con cncer de seno

    Cancer.gov

    Contiene informacin sobre los tipos de ciruga de seno, como la operacin para conservar el seno y la mastectoma, y ayuda a las mujeres diagnosticadas con CDIS o con cncer de seno a decidir cul ciruga es la ms conveniente para ellas.

  9. MEDIDA DE LA CSF CROMTICA Y ACROMTICA CON MONITORES ORDINARIOS PARA PRCTICAS DE LABORATORIO

    E-print Network

    Escolano, Francisco

    comerciales, de prestaciones inferiores, que presentan problemas para generar estímulos para experimentos distinguir la red de un campo uniforme. La CSF se obtiene como la inversa del contraste global en el espacio imposibilita su uso durante un experimento, por lo que trabajamos con estímulos pre-calculados. MEDIDA El

  10. TRIBUNAL REGIONAL FEDERAL DA 1 REGIO XIV CONCURSO PBLICO PARA PROVIMENTO DE CARGO DE

    E-print Network

    Maier, Rudolf Richard

    TRIBUNAL REGIONAL FEDERAL DA 1 REGIO XIV CONCURSO PBLICO PARA PROVIMENTO DE CARGO DE JUIZ FEDERAL SUBSTITUTO 1 REGIO Edital de Retificao O Desembargador Federal Presidente da Comisso de Concurso do XIV Concurso Pblico para provimento de cargo de Juiz Federal Substituto do Tribunal Regional

  11. CAPACITACIN A LIDERES DE LAS COMUNIDADES RURALES PARA LLEGAR CON EL MENSAJE

    Microsoft Academic Search

    Jorge Alfredo Gonzlez Prez

    2010-01-01

    Para lograr introducir en nuestras comunidades rurales cualquiera informacin tcnica o participativa debemos de pensar en forma de desarrollo futuro buscando alternativas que propicien una buena capacitacin en este caso para la introduccin de nuevas tcnicas, cultivos, utilizacin de los recursos racionales e introduccin de otros de mejor resultados y hasta hacer de los diferentes productores de comunidades una escuela

  12. Evaluacin de dos esquemas de inmunizacin para la Evaluacin de dos esquemas de inmunizacin para la Evaluacin de dos esquemas de inmunizacin para la Evaluacin de dos esquemas de inmunizacin para la produccin de sueros produccin de sueros produccin de sueros produccin de sueros hiperinmunes contra hiperinmunes contra hiperinmunes contra hiperinmunes contra Leptospira Leptospira Leptospira Leptospira interrogans interrogans interrogans interrogans

    Microsoft Academic Search

    Andrs Gonzlez; Niurka Batista; Manuel Ortz; Vismark Torres; Juan F. Infante; Marta Gonzlez

    2002-01-01

    Los antisueros policlonales utilizados para el serotipaje de cepas de Leptospira deben caracterizarse por un alto nivel de aglutininas especficas a un serogrupo o serovar determinado y una baja reactividad cruzada frente al resto de las serovariedades. El presente trabajo se desarroll con el objetivo de evaluar y comparar dos de los esquemas de inmunizacin reportados para la obtencin de

  13. Planificacin y Lenguaje para la Iniciacin a la Programacin Orientada a Objetos

    Microsoft Academic Search

    Luis Fernndez Muoz; Rosala Pea Ros; J. ngel Velzquez-Iturbide

    Resumen La programacin orientada a objetos suele ensearse despus de la procedimental en los planes de estudio actuales. La parte prctica de una asignatura de programacin suele consistir en la realizacin de programas. Elegir un lenguaje para cada paradigma, uno orientado a objetos para ambos o un lenguaje hbrido, presenta diferentes problemas de aprendizaje. Adems, muchos lenguajes comerciales orientados a

  14. Extensi'on del c'alculo para la Modelizaci'on de Procesos Concurrentes

    E-print Network

    Alpuente, María

    casos como para pensar en 'el como recurso expresi­ vo adecuado para la programaci'on, vamos a definir un lenguaje de m'as alto nivel, ALEPH, que posee los recursos expresivos deseables en programaci'on y

  15. Notas de Aula: Fisica para Biologia: PRELIMINAR Nestor Caticha e Osame Kinouchi

    E-print Network

    Caticha, Nestor

    Notas de Aula: F´isica para Biologia: PRELIMINAR Nestor Caticha e Osame Kinouchi 27 de junho de´ificas nem discutir a biologia por tr´as destas aplica¸c~oes. Esperamos que isso seja estudado em outras problema maior para estudantes de biologia pode ser o tratamento matem´atico. Usaremos novamente o

  16. Arquitectura Multiagente para la Gestin de Informacin de Awareness en Entornos CSCL

    E-print Network

    Guerrero, Luis

    Arquitectura Multiagente para la Gestin de Informacin de Awareness en Entornos CSCL Ivn D razn, este artculo presenta una Arquitectura Multiagentes como alternativa para la gestin de usuario mediante una Arquitectura Multiagente que permite gestionar la informacin de Conciencia Grupal o

  17. Uso del conocimiento de la arquitectura Fermi para mejorar el rendimiento en aplicaciones

    E-print Network

    Llanos, Diego R.

    Uso del conocimiento de la arquitectura Fermi para mejorar el rendimiento en aplicaciones CUDA Yuri arquitectura Fermi de NVIDIA introduce nuevos criterios a la hora de selec- cionar los tama~nos y la geometr arquitectura para aplicar adecua- damente tecnicas de optimizacion de codigo. Fermi [2] [3] [4] es la

  18. Desarrollo y Aplicacin de un ndice de Calidad de Agua para ros en Puerto Rico

    E-print Network

    Gilbes, Fernando

    Desarrollo y Aplicacin de un ndice de Calidad de Agua para ros en Puerto Rico por Francisco J en INGENIERA CIVIL UNIVERSIDAD DE PUERTO RICO RECINTO UNIVERSITARIO DE MAYAGEZ 2009 Aprobado por trabajo presenta la elaboracin de un ndice de Calidad de Agua (ICA) para los ros en Puerto Rico. Dicho

  19. SELEO PRECOCE DE CLONES DE BATATA PARA CARACTERES DO TUBRCULO1

    Microsoft Academic Search

    GEOVANI BERNARDO AMARO; CSAR AUGUSTO; BRASIL PEREIRA; EDUARDO DE SOUZA LAMBERT; LEITE MARTINS

    RESUMO - Nos ltimos anos, foi despertado um grande interesse para o pr ocessamento da batata na forma de fritura no Brasil. Visando obteno de culti- vares nacionais que atendam aos padres de qualidade culinria exigidos pelas indstrias de processamento, os programas de melhoramento de batata tm estabelecido estratgias para a reduo de custos e de tempo. Reali- zou-se

  20. Un test adaptativo informatizado para evaluar el conocimiento de ingls escrito: diseo y comprobaciones psicomtricas

    Microsoft Academic Search

    Julio Olea; Francisco Jos Abad; Vicente Ponsoda; M. Carmen Ximnez

    2004-01-01

    El presente artculo muestra el trabajo desarrollado para disear un test adaptativo informatizado que evala el nivel de conocimientos de ingls escrito en castellano-parlantes. Se describe el proceso se- guido para la elaboracin del banco de tems, la comprobacin de sus propiedades psicomtricas, el ajuste obtenido al modelo logstico de tres parmetros y las principales caractersticas del algoritmo adaptativo. Se

  1. Interpoladores Espaciais para Gerao de Superfcies de Densidade Populacional na Amaznia Brasileira: problemas e perspectivas.

    E-print Network

    Camara, Gilberto

    Interpoladores Espaciais para Geração de Superfícies de Densidade Populacional na Amazônia de superfícies de densidade populacional na Amazônia Brasileira. Os principais problemas de mais utilizados para gerar superfícies de densidade populacional. Discute-se a aplicabilidade destes

  2. Bases morfofisiolgicas para maior tolerncia dos hbridos modernos de milho a altas densidades de plantas

    Microsoft Academic Search

    Lus Sangoi; Milton Luiz de Almeida; Paulo Regis Ferreira da Silva; Gilber Argenta

    2002-01-01

    RESUMO O lanamento de hbridos de milho tolerantes ao aumento da densidade de plantas contribuiu para o incremento do potencial produtivo da cultura na segunda metade do sculo XX. Objetiva-se com esta reviso de literatura discutir caractersticas morfolgicas, fisiolgicas, fenolgicas e alomtricas que contriburam para maior adaptao do milho a elevadas densidades de plantas. Os processos de seleo utilizados pelos

  3. Escalamiento en la Densidad de Im agenes para una Reconstrucci on Tridimensional

    E-print Network

    Fraga, Luis Gerardo de la

    Escalamiento en la Densidad de Im#19;agenes para una Reconstrucci#19;on Tridimensional Luis Gerardo microscopio electr#19;onico de transmisi#19;on. El escalamiento en la densidad es un paso previo para usar semejante, a una densidad cero y una varianza arbitraria de valor 100. Roseman et al [6] simplemente

  4. Metodologa para el Anlisis y Diseo de Sistemas Multi Agente Robticos: MAD-Smart

    Microsoft Academic Search

    Marcela Vallejo Valencia; John Fredy; Ochoa Gmez; Trminos Generales

    RESUMEN En este artculo se describe la metodologa para el desarrollo de Sistemas Multi-Agente Robticos MAD-Smart y se desarrollan algunos ejemplos para visualizar algunas de sus car actersticas. La metodologa buscar dar cobertura en la fase de con ceptuacin, anlisis y diseo mediante la definicin de un conj unto de actividades que ayudan al desarrollador a entender mejor el problema

  5. The effects of para-chlorophenylalanine on brain serotonin, food intake, and U-Maze behavior

    Microsoft Academic Search

    Robert A. McFarlain; J. M. Bloom

    1972-01-01

    The effects of the serotonin depleting drug dl para-chlorophenylalanine on conditioned alternation in the U-Maze were examined. Rats given para-chlorophenylalanine and nondrugged rats received reward contingent upon alternating choices between the left and right maze arms.

  6. Livro de actividades em ToonTalk para o pr-escolar

    Microsoft Academic Search

    Leonel Morgado; Maria Gabriel Bulas Cruz; Ana Teresa Tavares; Christophe Moura

    Como orientao para os educadores, foi desenvolvido um conjunto de actividades adequadas a contextos de educao pr-escolar (crianas dos 3 aos 5 anos, na presena de educadores), que se apoiam no videojogo - ou videobrinquedo - ToonTalk. Para permitir uma fcil compreenso e acompanhamento por parte de crianas e educadores, foi ento desenvolvida uma forma grfica de transmitir essas actividades,

  7. Plastic debris ingestion by sea turtle in Para??ba, Brazil

    Microsoft Academic Search

    Rita Mascarenhas; Robson Santos; Douglas Zeppelini

    2004-01-01

    Coastal gill net entanglement and debris intake are important threats to the survival of sea turtles. Two sea turtles (Lepidochelys olivacea and Chelonia mydas) were found stranded along the coast of Para??ba. After necropsy, plastic debris were found in the stomach. The debris is described. This is the first record of this sort of problem for the Para??ba littoral.

  8. Accesibilidad para personas con debilidad visual Mac OS X Snow Leopard

    E-print Network

    Fernndez de Crdoba, Pedro

    Accesibilidad para personas con debilidad visual Mac OS X Snow Leopard ASIC 18 de noviembre de LEOPARD Al igual que otros sistemas operativos, MAC OS X Snow Leopard ofrece algunas ayudas para que las debilidad visual Mac OS X Snow Leopard ASIC 18 de noviembre de 2010 Pg. 2 de 25 1. Recomendaciones

  9. PROPUESTAS PARA EL PERFECCIONAMIENTO DEL CLCULO DE LOS COSTOS EN LA EMPRESA FORESTAL INTEGRAL GUANTNAMO

    Microsoft Academic Search

    Rebeca Judith Gabriel Pellicier; Mara del Pilar Garzn Wilson

    2011-01-01

    El trabajo se desarrollo en la Empresa Forestal Integral Guantnamo. Para la realizacin de la propuesta se analiz el sistema de costo que se utiliza y su aplicacin en las 3 Unidades Bsicas de Produccin Industrial con que cuentan. Estas unidades para realizar su actividad productiva tienen como punto de partida la demanda que existe por parte de los organismos

  10. Corynebacterium diphtheriae diphtheriae diphtheriae diphtheriae, empleados en la , empleados en la , empleados en la , empleados en la produccin de vacunas para uso humano produccin de vacunas para uso humano produccin de vacunas para uso humano produccin de vacunas para uso humano

    Microsoft Academic Search

    Elsie Iglesias; Yilian Plasencia; Teresita Morales; Luis Izquierdo

    2000-01-01

    En el presente estudio se evalu el mtodo de congelacin a -70C para la preservacin de Bordetella pertussis y Corynebacterium diphtheriae. Para verificar el sustento de los cultivos se realiz un adecuado control de calidad, que incluy comprobacin de pureza, viabilidad y estabilidad de las propiedades de inters. En este trabajo se probaron diferentes formulaciones. Se seleccion la que arroj

  11. AMIR-ST: Propuesta de una Aproximacin Metodolgica para la Ingeniera de Requisitos de Sistemas Telemticos

    Microsoft Academic Search

    Mario Fernando; Solarte Sarasty

    Resumen En el presente artculo se propone a AMIR-ST (Aproximacin Metodolgica para la Ingeniera de Requisitos de Sistemas Telemticos), como un conjunto articulado y bien balanceado de mtodos para el flujo de trabajo de Ingeniera de Requisitos, que constituye un proceso de desarrollo fundamentado en la interaccin continua con los usuarios, la obtencin del Modelo de Negocio, el desarrollo de

  12. Seguimiento de Objetos para la reconstruccin de Ambientes en 3D

    Microsoft Academic Search

    Alvarez Tirado

    Este documento presenta el estado del arte en el seguimiento de objetos por medio de visin artificial para generar ambientes reconstruidos en tres dimensiones. El proceso en general, es la consecucin o el flujo cclico de los procesos para llegar a los mdulos de seguimiento y reconstruccin. Partiendo desde los dispositivos de visin que son quienes proporcionan al sistema la

  13. Montaje de INTEGRAL -1 -Manual de Montaje para los Astrnomos de Soporte

    E-print Network

    montado. No obstante, hay que tener en cuenta que esta sala se utiliza tambin para otros instrumentos, y explica el montaje del instrumento. Este documento complementa el "Instrument Change Checklist" del WHT utili- zacin para las observaciones de esa noche con otros instrumentos. Los distintos pasos a ejecutar

  14. MAEB 2012 Albacete, 8-10 de Febrero de 2012 Tecnicas de pruebas automaticas para

    E-print Network

    Granada, Universidad de

    . Para demostar el uso estas estrategias, se aplican a un algoritmo gen´etico estacionario, comprobando c algoritmo gen´etico con codificaci´on real [11], aun- que el enfoque planteado puede extenderse a otros AEsMAEB 2012 Albacete, 8-10 de Febrero de 2012 T´ecnicas de pruebas autom´aticas para algoritmos

  15. Modelo de desarrollo de aplicaciones mviles basadas en videojuegos para la navegacin de personas ciegas

    Microsoft Academic Search

    Jaime Snchez; Luis Guerrero; Mauricio Senz; Hctor Flores

    Existe una necesidad real de contar con sistemas para que personas con discapacidad visual mejoren las habilidades de movilidad y orientacin, es especial para que los nios puedan mejorar su autonoma en el futuro. Sin embargo, estos sistemas deben ser diseados acorde a los objetivos, metodologas y recursos disponibles, as como tambin considerando los intereses y formas de interaccin de

  16. EVALUACIN DEL POTENCIAL AGROECOLGICO DE CAA DE AZCAR EN ARGENTINA PARA LA PRODUCCIN DE BIOCOMBUSTIBLES

    Microsoft Academic Search

    Rene Alicia Anschau; Noelia Flores Marco; Stella Maris Carballo; Jorge Hilbert

    2010-01-01

    En el presente trabajo se muestran los resultados obtenidos a partir de la evaluacin del cultivo de Caa de Azcar; La puesta en vigencia de las leyes argentinas, que fija incentivos especficos para este cultivo, reabren las posibilidades de retomar la produccin de bioetanol anhidro para uso como combustible. El objetivo final del presente estudio es entonces, contribuir al uso

  17. Para-nitrobenzyl esterases with enhanced activity in aqueous and nonaqueous media

    DOEpatents

    Arnold, Frances H. (Pasadena, CA); Moore, Jeffrey C. (Pasadena, CA)

    1998-01-01

    A method for isolating and identifying modified para-nitrobenzyl esterases which exhibit improved stability and/or esterase hydrolysis activity toward selected substrates and under selected reaction conditions relative to the unmodified para-nitrobenzyl esterase. The method involves preparing a library of modified para-nitrobenzyl esterase nucleic acid segments (genes) which have nucleotide sequences that differ from the nucleic acid segment which encodes for unmodified para-nitrobenzyl esterase. The library of modified para-nitrobenzyl nucleic acid segments is expressed to provide a plurality of modified enzymes. The clones expressing modified enzymes are then screened to identify which enzymes have improved esterase activity by measuring the ability of the enzymes to hydrolyze the selected substrate under the selected reaction conditions. Specific modified para-nitrobenzyl esterases are disclosed which have improved stability and/or ester hydrolysis activity in aqueous or aqueous-organic media relative to the stability and/or ester hydrolysis activity of unmodified naturally occurring para-nitrobenzyl esterase.

  18. Para-nitrobenzyl esterases with enhanced activity in aqueous and nonaqueous media

    DOEpatents

    Arnold, Frances H. (Pasadena, CA); Moore, Jeffrey C. (Pasadena, CA)

    1999-01-01

    A method for isolating and identifying modified para-nitrobenzyl esterases which exhibit improved stability and/or esterase hydrolysis activity toward selected substrates and under selected reaction conditions relative to the unmodified para-nitrobenzyl esterase. The method involves preparing a library of modified para-nitrobenzyl esterase nucleic acid segments (genes) which have nucleotide sequences that differ from the nucleic acid segment which encodes for unmodified para-nitrobenzyl esterase. The library of modified para-nitrobenzyl nucleic acid segments is expressed to provide a plurality of modified enzymes. The clones expressing modified enzymes are then screened to identify which enzymes have improved esterase activity by measuring the ability of the enzymes to hydrolyze the selected substrate under the selected reaction conditions. Specific modified para-nitrobenzyl esterases are disclosed which have improved stability and/or ester hydrolysis activity in aqueous or aqueous-organic media relative to the stability and/or ester hydrolysis activity of unmodified naturally occurring para-nitrobenzyl esterase.

  19. Para-nitrobenzyl esterases with enhanced activity in aqueous and nonaqueous media

    DOEpatents

    Arnold, F.H.; Moore, J.C.

    1998-04-21

    A method is disclosed for isolating and identifying modified para-nitrobenzyl esterases. These enzymes exhibit improved stability and/or esterase hydrolysis activity toward selected substrates and under selected reaction conditions relative to the unmodified para-nitrobenzyl esterase. The method involves preparing a library of modified para-nitrobenzyl esterase nucleic acid segments (genes) which have nucleotide sequences that differ from the nucleic acid segment which encodes for unmodified para-nitrobenzyl esterase. The library of modified para-nitrobenzyl nucleic acid segments is expressed to provide a plurality of modified enzymes. The clones expressing modified enzymes are then screened to identify which enzymes have improved esterase activity by measuring the ability of the enzymes to hydrolyze the selected substrate under the selected reaction conditions. Specific modified para-nitrobenzyl esterases are disclosed which have improved stability and/or ester hydrolysis activity in aqueous or aqueous-organic media relative to the stability and/or ester hydrolysis activity of unmodified naturally occurring para-nitrobenzyl esterase. 43 figs.

  20. Para-nitrobenzyl esterases with enhanced activity in aqueous and nonaqueous media

    DOEpatents

    Arnold, F.H.; Moore, J.C.

    1999-05-25

    A method is disclosed for isolating and identifying modified para-nitrobenzyl esterases which exhibit improved stability and/or esterase hydrolysis activity toward selected substrates and under selected reaction conditions relative to the unmodified para-nitrobenzyl esterase. The method involves preparing a library of modified para-nitrobenzyl esterase nucleic acid segments (genes) which have nucleotide sequences that differ from the nucleic acid segment which encodes for unmodified para-nitrobenzyl esterase. The library of modified para-nitrobenzyl nucleic acid segments is expressed to provide a plurality of modified enzymes. The clones expressing modified enzymes are then screened to identify which enzymes have improved esterase activity by measuring the ability of the enzymes to hydrolyze the selected substrate under the selected reaction conditions. Specific modified para-nitrobenzyl esterases are disclosed which have improved stability and/or ester hydrolysis activity in aqueous or aqueous-organic media relative to the stability and/or ester hydrolysis activity of unmodified naturally occurring para-nitrobenzyl esterase. 43 figs.

  1. Um enfoque antropolgico para o ensino de astronomia no nvel mdio

    NASA Astrophysics Data System (ADS)

    Costa, G. B.; Jafelice, L. C.

    2003-08-01

    H uma enorme carncia de materiais didtico-pedaggicos em astronomia para professores do ensino mdio, sobretudo materiais que explorem tambm aspectos humansticos. A origem do Universo um bom exemplo desta constatao central. Embora tal origem teve explicaes culturais diversas, os professores no tm informaes sobre isso e muito menos material que trabalhe diferentes vises de mundo e treinamento que os capacite a abord-las devidamente. Conseqentemente o ensino de astronomia costuma ser tecnicista e dissociado do aspecto humano que alimenta o grande interesse e curiosidade que esses temas despertam. Aqui apresentamos propostas visando contribuir para reverter esse quadro e trabalhamos distintas vises de Universo: espontneas, autctones e cientficas. Desenvolvemos prticas, materiais instrucionais e textos para viabilizar a adoo de um enfoque antropolgico para o ensino de astronomia no nvel mdio, no qual as culturas humanstica e cientfica sejam integradas de uma maneira contextualizada e eficaz para aquele ensino. Estas propostas foram aplicadas em um curso de treinamento para professores da rede pblica de diferentes disciplinas. A receptividade dos professores abordagem proposta e os resultados alcanados foram muito estimulantes. Destes, destacamos: produo de roteiros de atividades; desenvolvimento de prticas didtico-pedaggicas especficas (e.g., encenao de mitos; dana primordial guarani; "criao" de constelaes e interpretaes pluriculturais; etc.); e sugestes concretas para a efetiva realizao de um ensino interdisciplinar contextualizado, onde questes cosmognicas servem de mote para iniciar tal ensino. Discutimos estes resultados e como o enfoque adotado pode instrumentalizar os professores para leituras de mundo que incluem naturalmente aspectos culturais, sociais e histricos associados aos temas estudados. (PPGECNM/UFRN; PRONEX/FINEP; NUPA/USP; Temticos/FAPESP)

  2. Construo de um catlogo de aglomerados abertos para estudo da dinmica da estrutura espiral da Galxia

    NASA Astrophysics Data System (ADS)

    Carlos, I. M.; Lpine, J. R. D.

    2003-08-01

    Os aglomerados abertos so objetos de grande valor para o estudo da dinmica da Galxia devido esses objetos terem uma faixa de idade relativamente ampla. O trabalho visa estudar a dinmica da estrutura espiral da Galxia principalmente atravs do uso desses aglomerados, uma vez que o estudo da cinemtica desses objetos fundamental para esse objetivo. Nosso grupo trabalha no sentido de construir uma base de dados de aglomerados abertos contendo coordenadas, distncia, idade, movimentos prprios e velocidades radiais e j disponibiliza uma nova verso do catlogo de aglomerados abertos o qual uma compilao de edies anteriores, principalmente Lynga (1987), Mermilliod (1995) e ESO-B (Lauberts 1982). Nossa amostra possui cerca de 1630 aglomerados, mas nem todos os parmetros acima citados foram determinados em sua totalidade. Para determinarmos esses parmetros, derivamos as cores intrnsecas das estrelas membro de cada aglomerado a partir de seus tipos espectrais (busca feita no SIMBAD) obtendo assim o excesso de cor individual. A distribuio dos excessos de cor foi ento utilizada para derivarmos o avermelhamento mdio para cada aglomerado. De maneira similar, os tipos espectrais foram usados para estimar as magnitudes absolutas, e com as magnitudes absolutas e aparentes determinamos a respectiva distribuio do mdulo de distncia e finalmente a distncia. Para determinar as idades foram confeccionados os diagramas cor-magnitude das estrelas de cada aglomerado onde foram superpostas a Seqncia Principal de Idade Zero (ZAMS). Superpomos a ZAMS de Schmidt-Kaler e iscronas de composio solar. Essas iscronas foram usadas para determinao das idades dos aglomerados. Uma vez que no temos ainda resultados finais, apresentamos ento alguns diagramas cor-magnitude os quais foram usados para determinao, principalmente, da distncia e idade dos aglomerados.

  3. COD, para-chlorophenol and toxicity removal from para-chlorophenol containing synthetic wastewater in an activated sludge unit.

    PubMed

    Kargi, Fikret; Konya, Isil

    2006-05-20

    Chlorinated phenolic compounds present in some chemical industry wastewaters cause severe toxic effects on the organisms and often are resistant to biological degradation. Synthetic wastewater containing different concentrations of para-chlorophenol (4-chlorophenol, 4-CP) was biologically treated in an activated sludge unit for COD, 4-CP and toxicity removal. Effects of feed 4-CP concentration on COD, 4-CP, toxicity removals and on sludge volume index were investigated at a constant sludge age of 20 days and hydraulic residence time (HRT) of 25 h. Resazurin method based on dehydrogenase activity was used for determination of the toxicity of the feed and effluent wastewater. COD and 4-CP removals were not affected by the presence of 4-CP in the wastewater up to feed 4-CP concentration of 925 mg l(-1) because of almost complete degradation of 4-CP yielding lower than 50 mg l(-1) 4-CP in the aeration tank. Percent COD, 4-CP and toxicity removals decreased and the effluent COD, 4-CP and toxicity levels increased with further increases in the feed 4-CP concentrations above 925 mg l(-1) because of inhibitory concentrations of 4-CP in the reactor. Biomass concentration in the aeration tank decreased and the sludge volume index (SVI) increased with feed 4-CP concentrations above 925 mg l(-1) resulting in lower COD and 4-CP removal rates. The rates of COD and 4-CP removals indicated substrate (4-CP) inhibition for the feed 4-CP concentrations above 925 mg l(-1) corresponding to the reactor 4-CP of above 200 mg l(-1). The system should be operated at the feed 4-CP concentrations of less than 900 mg l(-1) (4-CP(R) < 200 mg l(-1)) in order to obtain high rates and extents of COD, 4-CP and toxicity removals at a sludge age of 20 days and HRT of 25 h. PMID:16257114

  4. 75 FR 34943 - Defense Federal Acquisition Regulation Supplement; Para-Aramid Fibers and Yarns Manufactured in a...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-06-21

    ...Domestic Para-Aramid Sewing Thread May Be of Lower Quality...specification to use para-aramid thread that was heavier and weaker than the commercial thread that was used in the commercial...Regulatory Flexibility Analysis One respondent...

  5. Aplicacin del Teorema de Nekhorochev para tiempos de estabilidad en Mecnica Celeste

    NASA Astrophysics Data System (ADS)

    Miloni, O.; Nez, J.; Brunini, A.

    En Mecnica Celeste, uno de los problemas centrales consiste en la determinacin de los tiempos de estabilidad. El teorema de Nekhorochev proporciona un mtodo para dicho estudio, para un sistema determinado por un hamiltoniano descripto en las variables accin-ngulo. El trabajo consiste en la acotacin tanto del potencial perturbador y de la matriz hessiana del hamiltoniano integrable para determinar luego el tiempo de estabilidad de dicho sistema, donde por estabilidad se entiende la separacin en norma infinito en el espacio de las acciones.

  6. Colonization of wheat para-nodules by N2-fixing cyanobacterium Nostoc 2S9

    SciTech Connect

    Gantar, Miroslav; Elhai, Jeff

    1999-03-01

    The treatment of wheat roots with 2,4-Dichlorophenoxyacetic acid led to the formation of tumor-like structures, para-nodules, which were readily colonized by cyanobacteria. The amount of cyanobacteria found on 2,4-D treated roots was 3.6 times higher than that found on untreated roots. Cyanobacteria penetrated the para-nodules by migrating in between loosely arranged cells that covered their surfaces or by penetrating the space at the junction of root and para-nodule. In plants treated with 2,4-D and co-cultivated with cyanobacteria, the rate of acetylene reduction was three times higher than in control plants.

  7. Endovascular Treatment of a Ruptured Para-Anastomotic Aneurysm of the Abdominal Aorta

    SciTech Connect

    Sfyroeras, Giorgos S.; Lioupis, Christos, E-mail: lioupisC@vodafone.net.gr; Bessias, Nikolaos; Maras, Dimitris [Red Cross Hospital of Athens, Department of Vascular Surgery (Greece); Pomoni, Maria [Red Cross Hospital of Athens, Department of Radiology (Greece); Andrikopoulos, Vassilios [Red Cross Hospital of Athens, Department of Vascular Surgery (Greece)

    2008-07-15

    We report a case of a ruptured para-anastomotic aortic aneurysm treated with implantation of a bifurcated stent-graft. A 72-year-old patient, who had undergone aortobifemoral bypass for aortoiliac occlusive disease 16 years ago, presented with a ruptured para-anastomotic aortic aneurysm. A bifurcated stent-graft was successfully deployed into the old bifurcated graft. This is the first report of a bifurcated stent-graft being placed through an 'end-to-side' anastomosed old aortobifemoral graft. Endovascular treatment of ruptured para-anastomotic aortic aneurysms can be accomplished successfully, avoiding open surgery which is associated with increased mortality and morbidity.

  8. Modelos Teoricos de Linhas de Recombinacao EM Radio Frequencias Para Regioes H II

    NASA Astrophysics Data System (ADS)

    Abraham, Z.; Cancoro, A. C. O.

    1987-05-01

    Foram feitos modelos de linhas de recombino provenientes de regies HII nas frequncias de rdio para distintos nmeros qunticos. Estes modelos consideram regres H II esfericamente simtricas com variaes radiais na densidade e temperatura eletrnica, efeitos de colisoes inelsticas dos eletrons (alargarnento por presso), e afastarnento do equilibrio termodinmico local. 0 bojetivo construir o perfil da linha para cada ponto da nuvern e obter o valor mdio resultante da sua convolu com o feixe da antena de tarnanho comparvel corn o tarnanho angular da nuvern para posterIor cornpara o corn

  9. All the three ParaHox genes are present in Nuttallochiton mirandus (Mollusca: polyplacophora): evolutionary considerations.

    PubMed

    Barucca, Marco; Biscotti, Maria A; Olmo, Ettore; Canapa, Adriana

    2006-03-15

    The ParaHox gene cluster contains three homeobox genes, Gsx, Xlox and Cdx and has been demonstrated to be an evolutionary sister of the Hox gene cluster. Among deuterostomes the three genes are found in the majority of taxa, whereas among protostomes they have so far been isolated only in the phylum Sipuncula. We report the partial sequences of all three ParaHox genes in the polyplacophoran Nuttallochiton mirandus, the first species of the phylum Mollusca where all ParaHox genes have been isolated. This finding has phylogenetic implications for the phylum Mollusca and for its relationships with the other lophotrochozoan taxa. PMID:16331637

  10. Measurement of the formaldehyde ortho to para ratio in three molecular clouds

    NASA Technical Reports Server (NTRS)

    Kahane, C.; Lucas, R.; Frerking, M. A.; Langer, W. D.; Encrenaz, P.

    1984-01-01

    Observations of ortho and para H2CO in two types of clouds, a warm cloud (Orion A) and two cold clouds (L183 and TMC1), are presented. The ortho to para ratio in Orion deduced from the H2(C-13)O data is about three, while that for TMC1 is about one and that for L183 is 1-2. The former value is in agreement with the value calculated from chemical models of ortho and para H2CO production. The values for the cold clouds are consistent with thermal equilibrium at a temperature slightly smaller than 10 K.

  11. Descripcin de la zona de alta difusin en un modelo bidimensional para hojas de corriente

    NASA Astrophysics Data System (ADS)

    Montero, M. F.; Paola, C. A.; Platzeck, A. M.

    Los modelos bidimensionales para describir hojas de corriente de alta simetra no suministran una descripcin detallada de las regiones donde la difusin es considerablemente importante. Tal es el caso de los modelos desarrollados en la dcada del '60 por Sweet, Parker, Petschek y Sonnerup. En esta comunicacin presentamos una solucin de las ecuaciones MHD en el entorno del origen, construyendo series bidimensionales para todas las magnitudes fsicas involucradas. Valindonos de la alta simetra y de las caractersticas del problema, logramos reducir el nmero de coeficientes a calcular. Utilizamos un programa autoconsistente para extender el clculo a regiones vecinas con difusin moderada o despreciable.

  12. Algoritmos genticos para la resolucin de problemas de Programacin por Metas Entera. Aplicacin a la Economa de la Educacin

    Microsoft Academic Search

    Rafael Caballero; Julin Molina Luque; Angel Torrico Gonzlez; Trinidad Gmez Nuez

    En este trabajo se presenta un algoritmo gentico para la resolucin de problemas de Programacin por Metas Entera. Este tipo de problemas presentan en general un gran nmero de dificultades para su resolucin utilizando algoritmos tradicionales de Programacin Entera, siendo en la mayora de los casos de problemas reales demasiado costosa computacionalmente para afrontarla con garantas. Sin embargo, se mostrar

  13. Evaluacin de la facilitacin del comercio y el transporte: Una herramienta prctica para su implementacin en los pases

    Microsoft Academic Search

    Banco Interamericano de Desarrollo

    2010-01-01

    En este documento se presenta una herramienta para evaluar los obstculos en las cadenas de abastecimiento internacional y las medidas necesarias para superarlos. Esta herramienta se ha diseado para los grupos interesados en la facilitacin del comercio y la logstica en los pases en vas de desarrollo, tales como los oficiales de los gobiernos responsables de formular polticas, los especialistas

  14. Reglas y Estrategias de Transformaci'on para Programas L'ogico--Funcionales

    E-print Network

    Alpuente, María

    Alba U.P. Valencia Mayo de 2000 #12; #12; Resumen El problema de la integraci'on de la programaci'on l programaci'on declarativa. Para que los lenguajes declarativos sean ' utiles y puedan utilizarse en apli

  15. Successful Mnemonics for "por"/"para" and Affirmative Commands with Pronouns.

    ERIC Educational Resources Information Center

    Mason, Keith

    1992-01-01

    Two mnemonic devices, "4A Rule" and "PERFECT," are described to simplify the learning of two grammar points: the placement of object pronouns with respect to commands and the distinction between "por" and "para." (five references) (LB)

  16. Communications: Development and characterization of a source of rotationally cold, enriched para-H3+

    NASA Astrophysics Data System (ADS)

    Tom, Brian A.; Mills, Andrew A.; Wiczer, Michael B.; Crabtree, Kyle N.; McCall, Benjamin J.

    2010-02-01

    In an effort to develop a source of H3+ that is almost entirely in a single quantum state (J =K=1), we have successfully generated a plasma that is enriched to 83% in para-H3+ at a rotational temperature of 80 K. This enrichment is a result of the nuclear spin selection rules at work in hydrogenic plasmas, which dictate that only para-H3+ will form from para-H2, and that para-H3+ can be converted to ortho-H3+ by subsequent reaction with H2. This is the first experimental study in which the H2 and H3+ nuclear spin selection rules have been observed at cold temperatures. The ions were produced from a pulsed solenoid valve source, cooled by supersonic expansion, and interrogated via continuous-wave cavity ringdown spectroscopy.

  17. Lo que usted debe saber antes de dar sus tejidos para investigacin mdica

    Cancer.gov

    Contiene informacin sobre las cosas que usted debe saber y tener en cuenta al tomar una decisin de donar sus tejidos para investigacin. El tejido puede incluir materiales de su cuerpo tales como piel, cabello, uas, sangre y orina.

  18. revised January 2009 Formulario de Inscripcin para Voluntario de 4-H

    E-print Network

    Tullos, Desiree

    ,000 Sexo: ( ) Nativo Hawaiano o Islas del Pacifico ( ) Suburbio mas de 50,000 ( ) Masculino ( ) Blanco o para todos sin tener en cuenta raza, color, religión, sexo, orientación sexual, nacionalidad, edad

  19. The design and synthesis of linear and macrocyclic Poly(para-arylene)s

    E-print Network

    Batson, Joel Marcus

    2013-01-01

    Poly(para-phenylene) (PPP) has generated sustained scientific interest due to its potential as a blue-emitting material for use in Organic Light Emitting Devices (OLEDs). However, due to its highly unfavorable solubility, ...

  20. ParaLearn: a massively parallel, scalable system for learning interaction networks on FPGAs

    Microsoft Academic Search

    Narges Bani Asadi; Christopher W. Fletcher; Greg Gibeling; John Wawrzynek; Wing H. Wong; Garry P. Nolan; Zoey Zhou

    2010-01-01

    ParaLearn is a scalable, parallel FPGA-based system for learning interaction networks using Bayesian statistics. ParaLearn includes problem specific parallel\\/scalable algorithms, system software and hardware architecture to address this complex problem. Learning interaction networks from data uncovers causal relationships and allows scientists to predict and explain a system's behavior. Interaction networks have applications in many fields, though we will discuss them

  1. v*i*d*a lab: repensar los objetos para la vida cotidiana

    Microsoft Academic Search

    Alejandro Tamayo

    2009-01-01

    v*i*d*a lab (2005-2008) fue un taller experimental para estudiantes de diseo industrial de la Pontificia Universidad Javeriana de Bogot (Colombia ) el cual explor la concepcin de nuevos objetos para la vida cotidiana tomando como punto de partida acercamientos de distintas disciplinas sobre el fenmeno de la vida. El presente texto expone las principales re flexiones del taller, sus ejercicios

  2. Vers denouvelles molculesantibactriennes. Intrt du para-guanidinothylcalix[4]arne

    Microsoft Academic Search

    M. Grare; M. Mourer; J.-B. Regnouf de Vains; R.-E. Duval

    2006-01-01

    We present here the results concerning the antibacterial properties evaluation of para-guanidinoethylcalix[4]arene, compared with its constitutive monomer, the para-guanidinoethylphenol, and hexamidine (Hexomdine), an antiseptic from the diamidine family widely used in therapeutic, chosen as a reference in this study for its resemblance in terms of functional groups. Antibacterial activities of those three compounds were evaluated by microdilution methods, in Mueller

  3. Una alternativa teraputica para micosis superficiales An alternative therapy to superficial mycosis

    Microsoft Academic Search

    RESUMEN: se realizaron ensayos in-vivo e in-vitro de una solucin saturada de sacarosa, eugenol (0.4%v\\/v) y polietilenglicol 400 (0.4%v\\/v) para determinar su accin fungicida sobre cepas productoras de micosis superficiales y su genotoxicidad. A suspensiones de Microsporum canis, Trichophyton rubrum, Trichophyton mentagrophytes y Epidermophyton flocosum, se les agreg la solucin de ensayo y se hicieron cultivos en agar Sabouraud para

  4. Desenvolvimento de um data logger porttil para sinais de movimento utilizando cartes MMC

    Microsoft Academic Search

    R. E. M. Farias; J. P. J Conti; E. F. Manffra; P. Nohama

    Resumo - Neste artigo descreve-se o desenvolvimento de um data logger porttil para armazenagem de sinais relacionados ao movimento humano. O sistema utiliza cartes MultiMediaCard como dispositivo de armazenamento de alta capacidade e um microcontrolador com oito canais de converso A\\/D para entrada dos sinais analgicos provenientes de sensores de movimento ou eletrodos de eletromiografia. A taxa de amostragem pode

  5. Curing of some epoxy-acrylate glycidyl ethers based on para-alkyl substituted phenols

    Microsoft Academic Search

    C. N. Ca?caval; D. Ro?u; A. Stoleriu

    1997-01-01

    Curing of epoxy-acrylate glycidyl ethers based on phenol and para-alkyl [?CH3, ?C(CH3)3, ?C9H19] substituted phenols in the presence of benzoyl peroxide was examined by differential scanning calorimetry at different heating rates. The tested monomers polymerize first as acrylic monomers and the reaction continues by the curing process only in the case of the epoxy-acrylate glycidyl ethers of para-alkyl substituted phenols,

  6. Hibridacion entre Filtros de Particulas y Meta-heuristicas para resolver problemas dinamicos

    E-print Network

    Pantrigo Fernández, Juan José

    optimizaci´on en los cuales la descripci´on del problema y/o los datos relevantes cambian en el tiempo. Para de adaptaci´on a cambios. Los m´etodos metaheur´isticos son procedimientos para explorar de forma´es de la hibridaci´on de los m´etodos anteriores. 1. Introducci´on Muchos problemas de optimizaci´on con

  7. Un Algoritmo Genetico para Aprendizaje de un Sistema Basado en Reglas Difusas tipo

    E-print Network

    Granada, Universidad de

    Un Algoritmo Gen´etico para Aprendizaje de un Sistema Basado en Reglas Difusas tipo Takagi Sugeno F´atico, sistemas basados en reglas difusas TS, algoritmos gen´eticos, I. INTRODUCCI ´ON El modelado difuso ling´on por m´inimos cuadrados. Para la definici´on de la BD se emplear´a un Algoritmo Gen´etico que incluye

  8. REPERTORIO DIDCTICO ESPAOL EN EL MARCO DE LA ENSEANZA PARA CUERDA EN EL CONSERVATORIO DE MADRID EN EL SIGLO XIX: OBRAS PARA VIOLN, VIOLONCELLO Y VIOLA

    Microsoft Academic Search

    Mnica Garca Velasco

    2005-01-01

    El anlisis del conjunto de aportaciones al repertorio didctico para violn, viola y violoncello, realizadas por autores vinculados al Conservatorio de Madrid durante el siglo XIX, pone de manifiesto la conexin de la enseanza de cuerda con modelos europeos, al tiempo que representa un captulo imprescindible dentro del estudio de la msica instrumental espaola en esa centuria. El Mtodo Elemental

  9. ALCHEMIST (Estudios sobre la Secuenciacin e Identificacin de Marcadores para el Mejoramiento de la Terapia Adjuvante para el Cncer de Pulmn): Preguntas y respuestas

    Cancer.gov

    ALCHEMIST comprende tres estudios clnicos integrados de medicina de precisin diseados para identificar a personas con cncer de pulmn en estadio inicial cuyos tumores tienen ciertos cambios genticos poco comunes. Tambin buscan evaluar si los tratamientos con medicamentos que combaten esos cambios moleculares pueden mejorar la supervivencia

  10. Competing ParA structures space bacterial plasmids equally over the nucleoid.

    PubMed

    Ietswaart, Robert; Szardenings, Florian; Gerdes, Kenn; Howard, Martin

    2014-12-01

    Low copy number plasmids in bacteria require segregation for stable inheritance through cell division. This is often achieved by a parABC locus, comprising an ATPase ParA, DNA-binding protein ParB and a parC region, encoding ParB-binding sites. These minimal components space plasmids equally over the nucleoid, yet the underlying mechanism is not understood. Here we investigate a model where ParA-ATP can dynamically associate to the nucleoid and is hydrolyzed by plasmid-associated ParB, thereby creating nucleoid-bound, self-organizing ParA concentration gradients. We show mathematically that differences between competing ParA concentrations on either side of a plasmid can specify regular plasmid positioning. Such positioning can be achieved regardless of the exact mechanism of plasmid movement, including plasmid diffusion with ParA-mediated immobilization or directed plasmid motion induced by ParB/parC-stimulated ParA structure disassembly. However, we find experimentally that parABC from Escherichia coli plasmid pB171 increases plasmid mobility, inconsistent with diffusion/immobilization. Instead our observations favor directed plasmid motion. Our model predicts less oscillatory ParA dynamics than previously believed, a prediction we verify experimentally. We also show that ParA localization and plasmid positioning depend on the underlying nucleoid morphology, indicating that the chromosomal architecture constrains ParA structure formation. Our directed motion model unifies previously contradictory models for plasmid segregation and provides a robust mechanistic basis for self-organized plasmid spacing that may be widely applicable. PMID:25521716

  11. Spontaneous Emission Between - and Para-Levels of Water-Ion H_2O^+

    NASA Astrophysics Data System (ADS)

    Tanaka, Keiichi; Harada, Kensuke; Nanbu, Shinkoh; Oka, Takeshi

    2012-06-01

    Nuclear spin conversion interaction of water ion, H_2O^+, has been studied to derive spontaneous emission lifetime between ortho- and para-levels. H_2O^+ is a radical ion with the ^2B_1 electronic ground state. Its off-diagonal electron spin-nuclear spin interaction term, Tab(S_a? I_b + S_b? I_a), connects para and ortho levels, because ? I = I_1 - I_2 has nonvanishing matrix elements between I = 0 and 1. The mixing by this term with Tab = 72 MHz predicted by ab initio theory in the MRD-CI/Bk level, is many orders of magnitude larger than for closed shell molecules because of the large magnetic interaction due to the un-paired electron. Using the molecular constants reported by Mrtz et al. by FIR-LMR, we searched for ortho and para coupling channels below 1000 cm-1 with accidental near degeneracy between para and ortho levels. For example, hyperfine components of the 42,2(ortho) and 33,0(para) levels mix by 1.2 10-3 due to their near degeneracy (? E = 0.417 cm-1), and give the ortho-para spontaneous emission lifetime of about 0.63 year. The most significant low lying 10,1(para) and 11,1(ortho) levels, on the contrary, mix only by 8.7 10-5 because of their large separation (? E = 16.267 cm-1) and give the spontaneous emission lifetime from 10,1(para) to 00,0(ortho) of about 100 year.These results qualitatively help to understand the observed high ortho- to para- H_2O^+ ratio of 4.8 0.5 toward Sgr B2 but they are too slow to compete with the conversion by collision unless the number density of the region is very low (n 1 cm-3) or radiative temperature is very high (T_r > 100 K). M. Staikova, B. Engels, M. Peric, and S.D. Peyerimhoff, Mol. Phys. 80, 1485 (1993) P. Mrtz, L.R. Zink, K.M. Evenson, and J.M. Brown J. Chem. Phys. 109, 9744 (1998). LP. Schilke, et al., A&A 521, L11 (2010).

  12. On the Ortho:Para Ratio of H+ 3 in Diffuse Molecular Clouds

    NASA Astrophysics Data System (ADS)

    Crabtree, Kyle N.; Indriolo, Nick; Kreckel, Holger; Tom, Brian A.; McCall, Benjamin J.

    2011-03-01

    The excitation temperature T 01 derived from the relative intensities of the J = 0 (para) and J = 1 (ortho) rotational levels of H2 has been assumed to be an accurate measure of the kinetic temperature in interstellar environments. In diffuse molecular clouds, the average value of T 01 is ~70 K. However, the excitation temperature T(H+ 3) derived from the (J, K) = (1, 1) (para) and (1, 0) (ortho) rotational levels of H+ 3 has been observed to be ~30 K in the same types of environments. In this work, we present observations of H+ 3 in three additional diffuse cloud sight lines for which H2 measurements are available, showing that in four of five cases T 01 and T(H+ 3) are discrepant. We then examine the thermalization mechanisms for the ortho:para ratios of H+ 3 and H2, concluding that indeed T 01 is an accurate measure of the cloud kinetic temperature, while the ortho:para ratio of H+ 3 need not be thermal. By constructing a steady-state chemical model taking into account the nuclear spin dependence of reactions involving H+ 3, we show that the ortho:para ratio of H+ 3 in diffuse molecular clouds is likely governed by a competition between dissociative recombination with electrons and thermalization via reactive collisions with H2. Based in part on observations made with ESO Telescopes at the La Silla or Paranal Observatories under program ID 384.C-0618.

  13. ParaPep: a web resource for experimentally validated antiparasitic peptide sequences and their structures

    PubMed Central

    Mehta, Divya; Anand, Priya; Kumar, Vineet; Joshi, Anshika; Mathur, Deepika; Singh, Sandeep; Tuknait, Abhishek; Chaudhary, Kumardeep; Gautam, Shailendra K.; Gautam, Ankur; Varshney, Grish C.; Raghava, Gajendra P.S.

    2014-01-01

    ParaPep is a repository of antiparasitic peptides, which provides comprehensive information related to experimentally validated antiparasitic peptide sequences and their structures. The data were collected and compiled from published research papers, patents and from various databases. The current release of ParaPep holds 863 entries among which 519 are unique peptides. In addition to peptides having natural amino acids, ParaPep also consists of peptides having d-amino acids and chemically modified residues. In ParaPep, most of the peptides have been evaluated for growth inhibition of various species of Plasmodium, Leishmania and Trypanosoma. We have provided comprehensive information about these peptides that include peptide sequence, chemical modifications, stereochemistry, antiparasitic activity, origin, nature of peptide, assay types, type of parasite, mode of action and hemolytic activity. Structures of peptides consisting of natural, as well as modified amino acids have been determined using state-of-the-art software, PEPstr. To facilitate users, various user-friendly web tools, for data fetching, analysis and browsing, have been integrated. We hope that ParaPep will be advantageous in designing therapeutic peptides against parasitic diseases. Database URL: http://crdd.osdd.net/raghava/parapep/ PMID:24923818

  14. The formaldehyde ortho/para ratio as a probe of dark cloud chemistry and evolution

    NASA Technical Reports Server (NTRS)

    Dickens, J. E.; Irvine, W. M.

    1999-01-01

    We present measurements of the H2CO ortho/para ratio toward four star-forming cores, L723, L1228, L1527, and L43, and one quiescent core, L1498. Combining these data with earlier results by Minh et al., three quiescent cores are found to have ortho/para ratios near 3, the ratio of statistical weights expected for gas-phase formation processes. In contrast, ortho/para ratios are 1.5-2.1 in five star-forming cores, suggesting thermalization at a kinetic temperature of 10 K. We attribute modification of the ortho/para ratio in the latter cores to formation and/or equilibration of H2CO on grains with sub-sequent release back into the gas phase due to the increased energy inputs from the forming star and outflow. We see accompanying enhancements in the H2CO abundance relative to H, to support this idea. The results suggest that the formaldehyde ortho/para ratio can differentiate between quiescent cores and those in which low-mass star formation has occurred.

  15. Davis o ambiente ideal para estudantes internacionais estudarem, desenvolverem-se como cidados mundiais e fazerem amigos para toda a vida. Davis tem uma populao

    E-print Network

    California at Davis, University of

    a sociedade e o 10º lugar em termos de gastos com pesquisas. Todos os anos, mais de 30 000 alunos estudam informações Para baixar um folheto com informações sobre todos os nossos cursos, visite nosso website ou entre o ano todo, é um dos cursos de inglês intensivo mais antigos e respeitados dos EUA. Com uma carga

  16. "How Much Economic Value Does My Credential Have?": Reformulating Tinto's Model to Study Students' Persistence in Community Colleges

    ERIC Educational Resources Information Center

    Stuart, G. Rob; Rios-Aguilar, Cecilia; Deil-Amen, Regina

    2014-01-01

    Community colleges play a key role in educating the large number of non-traditional, low-income, and under-prepared students who have entered higher education in the past several decades. Despite increased access, community colleges are struggling to graduate students. Most, if not all, strategies provided by scholars to improve college completion

  17. Comparison of Divalent Transition Metal Ion ParaCEST MRI Contrast Agents

    PubMed Central

    Dorazio, Sarina J.; Olatunde, Abiola O.; Tsitovich, Pavel B.

    2013-01-01

    Transition metal ion-based paraCEST agents (TM-CEST) are a promising new class of compounds for MRI contrast. Members in this class of compounds include paramagnetic complexes of FeII, CoII and NiII. The development of the coordination chemistry for these paraCEST agents is presented with an emphasis on the choice of azamacrocycle backbone and pendent groups with the goals of controlling oxidation state, spin state and stability of the complexes. CEST spectra and images are compared for different macrocyclic complexes containing amide or heterocyclic pendent groups. The potential of paraCEST agents that function as pH and redox-activated MRI probes is discussed. PMID:24253281

  18. Irritant contact dermatitis from a black henna tattoo without sensitization to para-phenylendiamine.

    PubMed

    Kind, Fabiola; Hofmeier, Kathrin Scherer; Bircher, Andreas J

    2013-06-01

    Allergic contact dermatitis from nonpermanent black henna tattoos has been frequently reported, particularly in children. Contamination or adulteration of the dyes with para-phenylendiamine has been identified as major cause of active sensitization and elicitation of severe allergic contact dermatitis. Sequelae include permanent sensitization, hyper- or hypopigmentation, scarring, keloids, and hypertrichosis. We report a rare case of irritant dermatitis to an unknown ingredient in a black henna tattoo with consecutive hypopigmentation. Sensitization to para-phenylendiamine and other para-compounds was excluded by patch test evaluation. This is relevant for future exposure to consumer products such as hair dyes or in occupational settings. Generally, black henna tattoos, particularly if done with dyes of unknown composition, should be strongly discouraged. PMID:23690526

  19. Allergic contact dermatitis to para-phenylenediamine in a tattoo: a case report.

    PubMed

    Turan, Hakan; Okur, Mesut; Kaya, Ertugrul; Gun, Emrah; Aliagaoglu, Cihangir

    2013-06-01

    It is highly popular among children and young adults to have temporary henna tattoos on their bodies in different colors and figures. Henna is a greenish natural powder obtained from the flowers and dry leaves of Lawsonia alba plant and its allergenicity is very low. Henna is also used in combination with other coloring substances such as para-phenylenediamine in order to darken the color and create a permanent tattoo effect. Para-phenylenediamine is a substance with high allergenicity potential and may cause serious allergic reactions. Here, we aimed to draw attention to the potential harms of para-phenylenediamine containing temporary tattoos by presenting a child patient who developed allergic contact dermatitis after having a scorpion-shaped temporary tattoo on his forearm. PMID:22909181

  20. Animaciones en 3D en tiempo real para las clases de ciencias e ingeniera: Ejemplos desarrollados con el mdulo de programacin VPython

    Microsoft Academic Search

    Eduardo E. Rodrguez

    RESUMEN: Se describe el uso del mdulo de programacin VPython para desarrollar animaciones en 3D por computadora para ilustrar temas de inters para las clases. Mostramos la utilidad del uso de animaciones para reforzar las presentaciones de materias como fsica y matemtica, entre otras. Con tales presentaciones se puede innovar en el desarrollo de las clases de ciencias e ingeniera

  1. Quantum rotation of ortho and para-water encapsulated in a fullerene cage

    PubMed Central

    Beduz, Carlo; Carravetta, Marina; Chen, Judy Y.-C.; Concistr, Maria; Denning, Mark; Frunzi, Michael; Horsewill, Anthony J.; Johannessen, Ole G.; Lawler, Ronald; Lei, Xuegong; Levitt, Malcolm H.; Li, Yongjun; Mamone, Salvatore; Murata, Yasujiro; Nagel, Urmas; Nishida, Tomoko; Ollivier, Jacques; Rols, Stphane; Rm, Toomas; Sarkar, Riddhiman; Turro, Nicholas J.; Yang, Yifeng

    2012-01-01

    Inelastic neutron scattering, far-infrared spectroscopy, and cryogenic nuclear magnetic resonance are used to investigate the quantized rotation and orthopara conversion of single water molecules trapped inside closed fullerene cages. The existence of metastable ortho-water molecules is demonstrated, and the interconversion of ortho-and para-water spin isomers is tracked in real time. Our investigation reveals that the ground state of encapsulated ortho water has a lifted degeneracy, associated with symmetry-breaking of the water environment. PMID:22837402

  2. Tcnicas de Minera de Datos para la Deteccin de Lavado de Activos

    Microsoft Academic Search

    Wilfredy Santamaria Ruiz

    AbstractLa tarea de deteccin de lavado,de activos no es un tema fcil de resolver, teniendo en cuenta las mltiples modalidades,y la evolucin rpida que,este tema,ha,tenido. En la actualidad muchas entidades financieras a nivel mundial, utilizan tcnicas de,minera de,datos,y modelos,estadsticos para reconocer,patrones,de comportamiento,de las transacciones fraudulentas,o de la utilizacin normal,de los clientes para detectar operaciones sospechosas. Este documento,realiza una introduccin,al tema

  3. Large scale visualization on the Cray XT3 using ParaView.

    SciTech Connect

    Rogers, David; Geveci, Berk (Kitware, Inc.); Eschenbert, Kent (Pittsburgh Supercomputing Center); Neundorf, Alexander (Technical University of Kaiserslautern); Marion, Patrick (Kitware, Inc.); Moreland, Kenneth D.; Greenfield, John

    2008-05-01

    Post-processing and visualization are key components to understanding any simulation. Porting ParaView, a scalable visualization tool, to the Cray XT3 allows our analysts to leverage the same supercomputer they use for simulation to perform post-processing. Visualization tools traditionally rely on a variety of rendering, scripting, and networking resources; the challenge of running ParaView on the Lightweight Kernel is to provide and use the visualization and post-processing features in the absence of many OS resources. We have successfully accomplished this at Sandia National Laboratories and the Pittsburgh Supercomputing Center.

  4. Natural bond orbital analysis of some para -substituted N -nitrosoacetanilide biological molecules

    Microsoft Academic Search

    Xiao-Hong Li; Rui-Zhou Zhang; Xian-Zhou Zhang

    2009-01-01

    Theoretical study of several para-substituted N-nitrosoacetanilide biological molecules has been performed using density functional B3LYP method with 6-31G(d,p) basis set.\\u000a Geometries obtained from DFT calculation were used to perform natural bond orbital analysis. The p characters of two nitrogen\\u000a natural hybrid orbital (NHO) ?\\u000a N3N2 bond orbitals increase with increasing ?\\u000a p values of the para substituent group on the

  5. LIVROS DIDTICOS E SUAS FUNES PARA O PROFESSOR DE MATEMTICA NO BRASIL E NA FRANA.

    E-print Network

    Paris-Sud XI, Université de

    LIVROS DIDÁTICOS E SUAS FUN??ES PARA O PROFESSOR DE MATEMÁTICA NO BRASIL E NA FRAN?A. Clovis Gomes-Claude.Regnier@univ-lyon2.fr RESUMO Esse texto aborda as funções do livro didático de matemática em dois n que visa pôr em evidência o livro didático de matemática como «vetor de formação continuada» para os

  6. REDES-Revista hispana para el anlisis de redes sociales Vol.17,#13, Diciembre 2009

    E-print Network

    Boyer, Edmond

    REDES- Revista hispana para el anlisis de redes sociales Vol.17,#13, Diciembre 2009 http://revista-redes - Universidad de Sevilla Resumen Este artculo resume una parte de nuestro trabajo sobre las redes de apoyo clasificacin de los tipos de redes de apoyo de los inmigrantes con menos de diez aos de residencia en Espaa

  7. ABORDAGEM MULTIOBJETIVO PARA OTIMIZAO DE REDES DE FILAS F. R. B. Cruz

    E-print Network

    Cruz, Frederico

    1 ABORDAGEM MULTIOBJETIVO PARA OTIMIZAO DE REDES DE FILAS FINITAS F. R. B. Cruz Departamento de uma rede de filas finitas com servio geral. Como tais objetivos so conflitantes, utiliza-se uma sistemas estocsticos. Palavras-Chaves: Redes de filas; algoritmos genticos; otimizao multiobjetivo

  8. REDES-Revista hispana para el anlisis de redes sociales Vol.15, #4, Diciembre 2008

    E-print Network

    Brandes, Ulrik

    REDES- Revista hispana para el anlisis de redes sociales Vol.15, #4, Diciembre 2008 http://revista-redes.rediris.es Patrones de cambio de las redes personales de inmigrantes en Catalua Jos Luis Molina1 (UAB), Jrgen Lerner2 (UK) y Slvia Gmez Mestres3 (UAB) Resumen A travs del anlisis de las redes personales de

  9. Aplicao de Tcnicas de Redes Sociais para o Sucesso Alexandre Baro

    E-print Network

    da Silva, Alberto Rodrigues

    Aplicao de Tcnicas de Redes Sociais para o Sucesso Educativo Alexandre Baro alexandrebarao combate ao insucesso escolar. A anlise de redes sociais concentra-se nas relaes existentes entre informao electrnicos, a aplicao da anlise de redes sociais pode proporcionar um conjunto de inferncias

  10. REDES-Revista hispana para el anlisis de redes sociales Vol.6,#7, Junio 2009

    E-print Network

    Boyer, Edmond

    REDES- Revista hispana para el anlisis de redes sociales Vol.6,#7, Junio 2009 http://revista-redes propone devolverle a la relacin social su importancia como unidad bsica de las redes sociales, y explorar lo que constituye su "sustancia" considerada aqu como el "motivo" de las relaciones. Las redes

  11. REDES-Revista hispana para el anlisis de redes sociales Vol.19,#10, Diciembre 2010

    E-print Network

    Boyer, Edmond

    REDES- Revista hispana para el anlisis de redes sociales Vol.19,#10, Diciembre 2010 http://revista-redes.rediris.es Redes de consejo en la industria biotecnolgica en Francia1 Alvaro Pia-Stranger2 IRISSO (CNRS artculo exploramos las redes de consejo inter-organizacionales, apoyndonos en la idea de que la

  12. Um Framework para Proviso de QoS em Redes Mveis Sem Fio1

    E-print Network

    Colcher, Srgio

    Um Framework para Proviso de QoS em Redes Mveis Sem Fio1 Luciana dos Santos Lima, Antnio Tadeu A proviso de QoS em redes mveis sem fio integrando solues isoladas encontradas na literatura. Esses descrita atravs de um cenrio simulado em que servios integrados so oferecidos sobre uma rede IP Mvel

  13. REDES-Revista hispana para el anlisis de redes sociales Vol.6,#7, Junio 2009

    E-print Network

    Paris-Sud XI, Universit de

    REDES- Revista hispana para el anlisis de redes sociales Vol.6,#7, Junio 2009 http://revista-redes.rediris.es En busca del contenido de las redes sociales: los "motivos" de las relaciones1 Claire Bidart2 , CNRS devolverle a la relacin social su importancia como unidad bsica de las redes sociales, y explorar lo que

  14. REDES-Revista hispana para el anlisis de redes sociales Vol.9,#6, Diciembre 2005

    E-print Network

    Brandes, Ulrik

    REDES- Revista hispana para el anlisis de redes sociales Vol.9,#6, Diciembre 2005 http://revista-redes.rediris.es La explicacin a travs de la visualizacin de redes1 Ulrik Brandes, Universidad de Konstanz. Tercero, valoramos algunos ejemplos especficos de la visualizacin de redes basada en estos principios

  15. Submetido revista Pesquisa Naval Abordagem Multiobjetivo para Otimizao de Redes de Filas Finitas

    E-print Network

    Cruz, Frederico

    Submetido revista Pesquisa Naval Abordagem Multiobjetivo para Otimizao de Redes de Filas atendimento global de uma rede de filas finitas com servio geral. Como tais objetivos so conflitantes of these important stochastic systems. Palavras-chave: Redes de filas. Algoritmos genticos. Otimizao multiobjetivo

  16. DEPENDNCIA DE MICORRIZAS PARA A NODULAO DE LEGUMINOSAS ARBREAS TROPICAIS1

    Microsoft Academic Search

    Ederson da Conceio Jesus; Jolimar Antnio Schiavo; Srgio Miana de Faria

    RESUMO - As espcies de leguminosas Piptadenia gonoacantha e Piptadenia paniculata apresentam dificuldade para nodular e crescer em substratos esterilizados, o que dificulta a seleo de estirpes de rizbio eficientes dessas espcies. As plantas que apresentam ndulos no campo esto micorrizadas. Assim, a boa resposta das plantas no campo pode ser devida presena de FMAs. O objetivo deste trabalho

  17. Planejamento Hierrquico Para Enxames Robticos Baseado na Explorao do Espao de Configuraes

    E-print Network

    Chaimowicz, Luiz

    independente do número de robôs. Experimentos foram realizados em simulação e ambientes reais e os resultados espaço de configurações individual, ou definir campos vetoriais globais para con- trolar o enxame como um

  18. Montagem e Resultados Preliminares de Aparato Experimental para Estudo Trmico de Materiais Ablativos

    Microsoft Academic Search

    Gabriel Antnio de Souza Jnior; Lucas Mello de Campos Arruda; Walber Ferreira Braga; Mrcia Barbosa; Henriques Mantelli

    O estudo do fenmeno fsico de ablao, que ocorre em determinados materiais usados em sistemas de proteo trmica de satlites, bem como a caracterizao das propriedades trmicas dos mesmos so considerados de grande importncia, por representar um ponto estratgico para a tecnologia espacial. No Brasil, os estudos de materiais ablativos tm sido realizados dentro da perspectiva do Programa Nacional de

  19. Interrupting Commemoration: Thinking with Art, Thinking through the Strictures of Argentina's "Espacio para la memoria"

    ERIC Educational Resources Information Center

    Paolantonio, Mario Di

    2011-01-01

    Recently, a few buildings within the "Espacio para la memoria" in Buenos Aires have been designated as a UNESCO Centre where, amongst other educational activities, evidentiary materials of the past repression are to be stored and displayed. Another building in the complex houses a Community Centre operated by the Mothers of the Plaza de Mayo,

  20. SELECCIN DE ACACIAS PARA LA CONSTRUCCIN DE NIDOS DE AVES: UN BENEFICIO INDIRECTO DEL MUTULISMO

    E-print Network

    Cuervo, Andrés

    SELECCI?N DE ACACIAS PARA LA CONSTRUCCI?N DE NIDOS DE AVES: UN BENEFICIO INDIRECTO DEL MUTULISMO caducifolio centroamericano, y comúnmente construyen sus nidos en acacias, principalmente en Acacia collinsii alimenta de las secreciones de los nectarios y los cuerpos de Belt de la de la acacia. Por su parte, la

  1. Creacin de gua ergonmica para el diseo de interfaz de supervisin

    Microsoft Academic Search

    Pere Ponsa; Marta Daz; Andreu Catal

    En tareas de supervisin humana de sala de control industrial se aplican de forma genrica disciplinas como la ingeniera del software y la ergonoma fsica para el diseo de la interfaz computerizada y el diseo de la sala de control. Desde el punto de vista de la interaccin persona ordenador, a estas disciplinas hay que aadir la ingeniera de la

  2. Significado de los cambios en el cuello uterino: Gua para la salud de la mujer

    Cancer.gov

    Explica los pasos que deben seguirse despus de un resultado anormal en una prueba de Pap o del VPH, as como las formas de diagnosticar y tratar las afecciones en el cuello uterino. Tambin contiene informacin sobre las pautas para los exmenes de deteccin y las vacunas contra el VPH.

  3. Estructuras de comunicacin para la resolucin de problemas de manera distribuida en la ingeniera concurrente

    Microsoft Academic Search

    Leonid B. Sheremetov

    Se presenta el problema de la comunicacin en la resolucin de problemas distribuidos. Se analizan las siguientes tecnologas de la comunicacin: actores, pizarrones, las comunicaciones homogneas y heterogneas en un ambiente de multiagentes. Se ilustra la discusin con ejemplos del ambiente para el Diseo de Objetos Estructurados (Design of Structured Objects - DESO). El prototipo actual integra algunos sistemas preexistentes

  4. INSTRUMENTACIN DE GRANDES CALDERAS DE POTENCIA PARA LA APLICACIN DE MODELOS AVANZADOS DE INGENIERA

    Microsoft Academic Search

    Luis Ignacio Dez; Cristbal Corts; Inmaculada Arauzo

    RESUMEN La implementacin de modelos de monitorizacin del funcionamiento de calderas de potencia requiere de gran cantidad de datos para su validacin, que adems deben cumplir unos mnimos requi- sitos de precisin y completitud. La importancia de estos modelos es cada da mayor, pues se aplican en el control de procesos complejos que suceden en este tipo de instalaciones. Frente

  5. 1/5 CBEB 2008 NOVO MTODO PARA COMPRESSO DE SINAIS DE EMG USANDO

    E-print Network

    Carvalho, Joo Luiz

    1/5 CBEB 2008 NOVO MTODO PARA COMPRESSO DE SINAIS DE EMG USANDO JPEG2000 M. V. C. Costa*, P. A for two-dimensional compression of EMG signals, namely correlation sorting. We also present an algorithm for compression of electromyographic (EMG) signals based on the JPEG2000 coding system. Originally designed

  6. Michael Faraday e o manuscrito Matter: uma soluo metafsica para o problema da ao a distncia

    Microsoft Academic Search

    Sonia Maria Dion

    2006-01-01

    O texto aqui traduzido, intitulado simplesmente Matria, revela um Faraday muito pouco conhecido. notrio que Michael Faraday (1791-1867) fez grandes contribuies para a cincia do eletromagnetismo; dentre elas, duas merecem destaque: a descoberta ex- perimental da induo eletromagntica e a elaborao terica do conceito de linhas de fora, alternativa explicao (de perspectiva newtoniana) baseada na ao a distn-

  7. Para presentar una queja en la Oficina de Equidad y Diversidad (OED), por favor incluya

    E-print Network

    Sheridan, Jennifer

    de Oportunidades de Empleo de los EE.UU. (U.S. Equal Employment Opportunity Commission) o del Estado para la Igualdad de Oportunidades en el Empleo de los Estados Unidos (U.S. Equal Employment Opportunity Commission) Reuss Federal Plaza 310 West Wisconsin Avenue, Suite 800 Milwaukee, WI 53203-2292 Telfono: 414

  8. NOTAS TAXONMICAS SOBRE EL GNERO VALERIANELLA MILL. (VALERIANACEAE) PARA LA FLORA IBRICA

    Microsoft Academic Search

    Juan Antonio DEVESA; Josefa LPEZ; Ral GONZALO

    2005-01-01

    RESUMEN. Notas taxonmicas sobre el gnero Valerianella Mill. (Valerianaceae) para la Flora Ibrica. Sobre la base de estudios experimentales que han puesto de manifiesto que Valerianella coronata y V. pumila no son sino dos morfotipos de una misma especie, que difieren fundamentalmente en caracteres carpolgicos, se plantea la hiptesis de que igual sucede en el caso de V. locusta V.

  9. Factor Structure of the "Escala de Autoeficacia para la Depresion en Adolescentes" (EADA)

    ERIC Educational Resources Information Center

    Diaz-Santos, Mirella; Cumba-Aviles, Eduardo; Bernal, Guillermo; Rivera-Medina, Carmen

    2011-01-01

    The current concept and measures of self-efficacy for depression in adolescents do not consider developmental and cultural aspects essential to understand and assess this construct in Latino youth. We examined the factor structure of the "Escala de Autoeficacia para la Depresion en Adolescentes" (EADA), a Spanish instrument designed to assess this

  10. UN ENFOQUE CONSTRUCTIVISTA PARA USO DE MAPAS CONCEPTUALES EN EDUCACIN A DISTANCIA DE PROFESORES

    Microsoft Academic Search

    Lea Fagundes; Alberto J. Caas

    Resumen. Este trabajo presenta una propuesta de utilizacin de los mapas conceptuales en la formacin de profesores a distancia usando el software CmapTools del Institute for Human and Machine Cognition, dentro de un paradigma constructivista. Nuestra propuesta utiliza como base terica la Epistemologa Gentica de Jean Piaget y, en especial, la teora de las Implicaciones Significantes para la construccin de

  11. BIBLIOTECA GRAPHICALSPRITEKERNEL (GSK): IMPLEMENTACIN DE UNA ARQUITECTURA DE TRES MODELOS PARA CREAR MULTIMEDIA EDUCATIVA

    Microsoft Academic Search

    Vicente Arturo Romero Zaldivar

    Resumen En este trabajo se presenta una arquitectura de tres modelos para desarrollar multimedia educativa, a travs de una implementacin particular de sta, la biblioteca GraphicalSpriteKernel. Esta arquitectura est constituida por tres modelos diferentes, a emplear en tres fases fundamentales del desarrollo de una aplicacin multimedia: diseo, implementacin y prueba. Esta especializacin permite que cada modelo incluya slo la lgica

  12. LA PREPARACIN DEL PROFESOR PARA EL DESARROLLO DE HABILIDADES BSICAS EN EDUCACIN LABORAL

    Microsoft Academic Search

    Alfredo Puig Batista

    2010-01-01

    El modelo educativo de Secundaria Bsica exige de un profesional que por su nivel de preparacin, sea capaz de garantizar la formacin integral de las presentes y futuras generaciones. En tal sentido, la presente investigacin incursiona en una de las problemticas acuciantes de esta educacin la preparacin de los profesores de Secundaria Bsica, para favorecer el desarrollo de habilidades prcticas

  13. SIGACLE: SIMULADOR GRFICO ASISTIDO POR COMPUTADOR PARA LA ENSEANZA DE PROGRAMACIN DE LENGUAJES ESTRUCTURADOS

    Microsoft Academic Search

    George Franco Cendales; Mara Paula Daz; Rafael J. Barros

    Se plantea la importancia que brinda el desarrollo de herramientas asistidas por computador como apoyo al proceso de enseanza. SIGACLE (Simulador Grfico Asistido por Computador Para la Enseanza de Programacin de Lenguajes Estructurados), tiene como principal objetivo el desarrollo de habilidades cognoscitivas en estudiantes de pregrado en las materias de programacin de computadores. Este documento define especficamente los conceptos necesarios

  14. The Combined Ortho / Para Hydrogen Assignments in H_2 Metal Chlorides

    NASA Astrophysics Data System (ADS)

    Obenchain, Daniel A.; Grubbs, G. S., II; Frank, Derek S.; Pickett, Herbert M.; Novick, Stewart E.

    2014-06-01

    The rotational spectra of H_2-AgCl and H_2-AuCl have been measured using a cavity FTMW spectrometer equipped with a laser ablation source. A combination of isotopic substitution, including HD and D_2 substitutions, and the spin-spin interaction of ortho hydrogen were used to determine the structures of these species. Trends in these structures and the strengths of the H_2 interaction will be discussed. Previous work with hydrogen containing complexes have shown that separate spectra are observed for the both the ortho and para hydrogen species. In this work, ortho and para hydrogen are assigned together. The a-axis in the present species is coincident with internal rotation axis of hydrogen. This symmetry, along with a covalent interaction of the H_2 with the metal chlorides, allows for a straightforward global assignment of the ortho and para species. The differences in the present study from the previous works will be discussed, as well as the assignment of the combined ortho and para fits. Y. Zhenhong, K. J. Higgins, W. Klemperer, M. C. McCarthy and P. Thaddeus, J. Chem. Phys., 123(2005) 221106. J. M. Michaug, W. C. Topic, W. Jger, J. Phys. Chem. A., 115(2011) 9456 M. Ishiguro, K Harada, K. Tanaka, Y. Sumiyoshi, Y. Endo, Chem. Phys. Lett., 554(2012) 33.

  15. Notas de Aula: Fisica para Biologia: PRELIMINAR Nestor Caticha e Osame Kinouchi

    E-print Network

    Caticha, Nestor

    Notas de Aula: F´isica para Biologia: PRELIMINAR Nestor Caticha e Osame Kinouchi 17 de abril de´oxima d´ecada. H´a vezes em que a escolha de carreira dos estudantes de biologia ´e descrita usando exemplos de simbiose entre biologia e f´isica que demostram alguns dos pontos altos da

  16. Algoritmos Basados en Nubes de Particulas y Evolucion Diferencial para el Problema de

    E-print Network

    Granada, Universidad de

    Algoritmos Basados en Nubes de Particulas y Evolucion Diferencial para el Problema de Optimizaci con variables reales pode- mos destacar a los algoritmos basados en nubes de particulas y evoluci propuestas en la literatura. Este estu- dio permite analizar las distintas tecnicas en funcion de sus

  17. Problemtica de Seguridad para el Comercio Electrnico en el Sector Turstico

    Microsoft Academic Search

    Javier Lpez; Javier Areitio; Felipe Rosell

    Resumen: Uno d e los s ervicios que c ada da cobra ms importancia y que promete un cambio radical para las empresas es el comercio electrnico en Internet, pero tradicionalmente las empresas r elacionadas con el t urismo slo han empleado la red pa ra darse a conocer y ofertar s us productos. La razn esencial es la d

  18. EL COMERCIO ELECTRNICO EN PASES EN DESARROLLO: LA PLANEACIN PARA EL XITO DEL NEGOCIO

    Microsoft Academic Search

    L. P. Carrillo

    2010-01-01

    Desde un enfoque que identifica al conocimiento como una fuente de capacidad de competencia en el contexto social, organizacional e individual se explica al Comercio electrnico como un proceso estratgico de las organizaciones de negocio, en el mbito econmico actual. En particular se enfatiza la trascendencia del proceso especfico de planeacin para el xito del negocio a travs de la

  19. The nongenotoxic carcinogens naphthalene and para-dichlorobenzene suppress apoptosis in Caenorhabditis elegans

    Microsoft Academic Search

    David Kokel; Yehua Li; Jun Qin; Ding Xue

    2006-01-01

    Naphthalene (1) and para-dichlorobenzene (PDCB, 2), which are widely used as moth repellents and air fresheners, cause cancer in rodents and are potential human carcinogens. However, their mechanisms of action remain unclear. Here we describe a novel method for delivering and screening hydrophobic chemicals in C. elegans and apply this technique to investigate the ways in which naphthalene and PDCB

  20. Arquitectura del Sistema de Gestin del ancho de Banda y Proteccin (SGBP) para entornos de redes

    E-print Network

    Ortega, Eusebi Calle

    Arquitectura del Sistema de Gestin del ancho de Banda y Proteccin (SGBP) para entornos de redes}@eia.udg.es Resumen. En el presente artculo se describe la arquitectura de un sistema inte- gral de gestin del ancho 4 detalla la arquitectura propuesta del sistema. Por ltimo, se presentan las conclusiones y futuros

  1. El proyecto InterAct: Una arquitectura de pizarra para la implementacin de Entornos Activos*

    E-print Network

    Autonoma de Madrid, Universidad

    El proyecto InterAct: Una arquitectura de pizarra para la implementacin de Entornos Activos en una arquitectura en la que se distinguen tres capas: la capa de contexto, la capa de interaccin columna vertebral de la arquitectura de InterAct. Se ha optado por una arquitectura basada en una

  2. SNTESE DE POLISTER PARA APLICAO EM CLULAS A COMBUSTVEL DO TIPO PEM

    Microsoft Academic Search

    R. P. Fiuza; D. R. de Souza; R. A. Fiuza; N. M. Jos; J. S. Boaventura

    RESUMO Dos diversos tipos de celulas a combustveis (CaC), a PEMFC (Proton Exchange Membrane Fuel Cell) se destaca pela versatilidade de aplicaes, tanto para uso estacionrio como mvel. Entretanto a PEMFC apresenta alto custo de fabricao, com reflexos diretos no custo da energia produzida. Este trabalho propem a sulfonao do cido ftalico e polimerizao deste com o glicerol, usando como

  3. Anniversary VetTech Training Hawai`i's First Para-Professionals

    E-print Network

    Olsen, Stephen L.

    facilities, and private veterinary practice (there are over 80 veterinary clinics in Hawai`i). The new a tremendous success, placing more than 70 percent of graduates in the veterinary industry. Building40th Anniversary VetTech Training Hawai`i's First Para-Professionals Veterinary Technology is among

  4. SISTEMA REMOTO DE ADQUISICIN PARA EL CONTROL DEL RUIDO AMBIENTAL CON FPGA Y FPAA

    Microsoft Academic Search

    A. Castillo Atoche; J. Vzquez Castillo; V. Sanchez Huerta; P. Del Ro Dawn

    RESUMEN Este artculo propone el diseo de un sistema de adquisicin de datos con componentes digitales y analgicos microelectrnicos reconfigurables, como son el FPGA (Field Programmable Gate Array) y el FPAA (Field Programmable Analog Array), para monitorear y analizar la contaminacin por ruido ambiental. Este prototipo obtiene los datos del ruido de una zona vial (zona centro de una ciudad)

  5. UNA EXPERIENCIA DE TRABAJO PARA EL DESARROLLO LOCAL EN UNA COMUNIDAD URBANA DE CUBA

    Microsoft Academic Search

    Milena Gmez Navarro

    2008-01-01

    La presente monografa titulada: Una experiencia de trabajo para el desarrollo local en una comunidad urbana de Cuba es fruto de una investigacin realizada hace algn tiempo ya, en el cual se ha contado con el apoyo del CITMA por ser el rgano rector en cuestin del medio ambiente en Cuba, especficamente en este caso se obtuvo la ayuda de

  6. Estudio para la Deteccin de Plomo en Alimentos de Origen Vegetal por Anlisis Infrarrojo

    Microsoft Academic Search

    Daniel Octavio Garca Romero; Leopoldo Flix; Yabar Escribanel

    Resumen El objetivo del estudio es determinar un mtodo no invasivo, basado en espectroscopia infrarroja, que sirva como herramienta para la deteccin de plomo en alimentos de origen vegetal. Teniendo presente que los vegetales son una parte importante de nuestra dieta, resulta necesario realizar investigaciones referentes a la presencia de metales pesados en los vegetales, en este caso plomo. El

  7. Taller: Enfoque Multisectorial para la Seguridad Alimentaria y Nutricin 7-8 Marzo 2013

    E-print Network

    Liu, X. Shirley

    desarrollo del sector agrícola más sostenible ambientalmente? ¿Cuál es el rol de los gobiernos y demás Multilaterales de la Agencia Colombiana de Cooperación Internacional para el Desarrollo. Colombia. Con recursos. Coordinador de la Alianza Panamericana de Nutrición y Desarrollo. Moderador: Pablo Mandeville. Coordinador

  8. Indicadores de gestin urbana. Los observatorios urbano-territoriales para el desarrollo sostenible. Manizales, Colombia

    Microsoft Academic Search

    Luz Stella Velsquez

    2001-01-01

    Los Observatorios para el Desarrollo Sostenible del Municipio de Manizales en Colombia, hacen parte del Sistema de Monitoreo diseado por el Municipio como apoyo a la gestin urbana local. A partir de los resultados de indicadores econmicos, sociales y ambientales, los ciudadanos podrn evaluar de forma permanente el desempeo de programas y proyectos del Plan de Desarrollo Municipal y participar

  9. O e-learning como etapa da universidade para o virtual

    Microsoft Academic Search

    Resumo. A adopo de prticas de ensino a distncia ou presencial de suporte electrnico, normalmente designadas por e-learning, tem sido vistas como a direco a seguir para um ensino superior, moderno e adequado realidade da Sociedade da Informao. Tendo em linha de conta a realidade especfica da Universidade Fernando Pessoa, traado pelos autores uma reflexo que sustenta que

  10. EL WIKI COMO RECURSO PARA DESARROLLAR COMPETENCIAS EN EL PROCESO DE ENSEANZA-APRENDIZAJE

    Microsoft Academic Search

    Mabel Lpez Garca; Jos Mara Souvirn Morenilla

    2010-01-01

    En el presente trabajo se analiza la utilidad de las tecnologas de la informacin y la comunicacin (TIC), y especficamente del Wiki, como herramienta para el modelo de enseanza-aprendizaje derivado del Espacio Europeo de Educacin Superior (EEES). Se realiza una aproximacin al significado del EEES y al modelo de enseanza que propone, en el que lo relevante no es tanto

  11. On the Ortho:Para Ratio of H3+ in Diffuse Molecular Clouds

    E-print Network

    Crabtree, Kyle N; Kreckel, Holger; Tom, Brian A; McCall, Benjamin J

    2011-01-01

    The excitation temperature T_01 derived from the relative intensities of the J = 0 (para) and J = 1 (ortho) rotational levels of H2 has been assumed to be an accurate measure of the kinetic temperature in interstellar environments. In diffuse molecular clouds, the average value of T_01 is ~70 K. However, the excitation temperature T(H3+) derived from the (J,K) = (1,1) (para) and (1,0) (ortho) rotational levels of H3+ has been observed to be ~30 K in the same types of environments. In this work, we present observations of H3+ in three additional diffuse cloud sight lines for which H2 measurements are available, showing that in 4 of 5 cases T_01 and T(H3+) are discrepant. We then examine the thermalization mechanisms for the ortho:para ratios of H3+ and H2, concluding that indeed T_01 is an accurate measure of the cloud kinetic temperature, while the ortho:para ratio of H3+ need not be thermal. By constructing a steady-state chemical model taking into account the nuclear-spindependence of reactions involving H3...

  12. ConPor: um modelo de gerao conceitual para o Lucia Specia, Lucia Helena Machado Rino

    E-print Network

    Specia, Lucia

    ConPor: um modelo de geração conceitual para o português Lucia Specia, Lucia Helena Machado Rino ­ 13565-905 ­ São Carlos ­ SP ­ Brasil {lspecia,lucia}@dc.ufscar.br Abstract. This paper describes Con

  13. REVISION DE MARCOS TEORICOS EDUCATIVOS PARA EL DISEO Y USO DE PROGRAMAS DIDCTICOS

    Microsoft Academic Search

    Z. Cataldi; F. Lage; R. Pessacq; Garca Martnez

    RESUMEN Se desea presentar la aparicin del software educativo y su evolucin a la luz de algunas de las teoras educati- vas ms representativas. En este paralelismo, slo se mencionan aquellas teoras y\\/o autores que darn los marcos con- ceptuales para los desarrollos de los programas didcticos en funcin de las aplicaciones deseadas. Partiendo del con- ductismo skinneriano1, se pasa

  14. EMPLEO DE FRACCIONES CELULARES DE LA LEVADURA Saccharomyces cerevisiae COMO ADITIVO ALIMENTARIO PARA Artemia franciscana

    Microsoft Academic Search

    Yamil Comabella; Tsai Garca-Galano; Olimpia Carrillo; Yadir Mauri

    RESUMEN En el presente estudio se evala la levadura Saccharomyces cerevisiae de forma desintegrada (LD) y tres fracciones celulares obtenidas de ella: complejo pared-membrana (FP), ncleo-protenas (FN) y citoplasma (FC) como aditivo alimentario utilizando al crustceo Artemia franciscana como modelo de experimentacin. Se realizaron dos bioensayos para determinar el efecto que ejercan dichos aditivos en el crecimiento, biomasa seca, supervivencia

  15. ELEMENTOS DE CONTEXTO DE LA POLTICA MIGRATORIA PARA TRABAJADORES EXTRANJEROS NO COMUNITARIOS EN ESPAA

    Microsoft Academic Search

    ROCO BEDOYA

    2010-01-01

    La poltica migratoria es considerada un objetivo primordial en Espaa, por eso el anlisis las directrices en trabajadores extranjeros no comunitarios es el tema de este artculo. Objetivo: identificar los elementos de contexto de la poltica migratoria. Metodologa: Se trata de la revisin analtica de las polticas y sistematizacin de la literatura sobre el tema de la poltica migratoria para

  16. Se necesitan 50 000 fumadores y exfumadores para el Estudio Nacional de Exmenes de Pulmn (NLST)

    Cancer.gov

    El Instituto Nacional del Cncer (NCI) lanz hoy un nuevo estudio para determinar si el examinar a las personas ya sea con una tomografa computarizada espiral o con una radiografa de pecho antes de que tengan sntomas puede reducir las muertes por cncer de pulmn.

  17. ACADEMIA DE POLCIA CIVIL CONCURSO PBLICO PARA PROVIMENTO DE VAGAS E FORMAO DE CADASTRO DE RESERVA

    E-print Network

    Maier, Rudolf Richard

    ACADEMIA DE POLÍCIA CIVIL CONCURSO P?BLICO PARA PROVIMENTO DE VAGAS E FORMA??O DE CADASTRO DE ACADEMIA DE POLÍCIA CIVIL DO DISTRITO FEDERAL (APCDF), no uso de suas atribuições legais, torna pública Diretor da Academia de Polícia Civil do Distrito Federal #12;

  18. Long-range excitons in conjugated polymers with ring torsions: poly(para-phenylene) and polyaniline

    E-print Network

    Harigaya, Kikuo

    Long-range excitons in conjugated polymers with ring torsions: poly(para-phenylene) and polyaniline (Running head: Long-range excitons in conjugated polymers) Kikuo Harigaya Physical Science Division formalism. Long-range excitons are charac- terized, and the long-range component of the oscillator strengths

  19. Antimicrobial effect of para-alkoxyphenylcarbamic acid esters containing substituted N-phenylpiperazine moiety

    PubMed Central

    Malk, Ivan; Bukovsk, Marin; Andriamainty, Fils; Galiinov, Jana

    2013-01-01

    In current research, nine basic esters of para-alkoxyphenylcarbamic acid with incorporated 4-(4-fluoro-/3-trifluoromethylphenyl)piperazin-1-yl fragment, 6i6m and 8f8i, were screened for their in vitro antimicrobial activity against Candida albicans, Staphylococcus aureus and Escherichia coli, respectively. Taking into account the minimum inhibitory concentration assay (MIC), as the most active against given yeast was evaluated 8i (MIC = 0.20 mg/mL), the most lipophilic structure containing para-butoxy and trifluoromethyl substituents. Investigating the efficiency of the compounds bearing only a single atom of fluorine and appropriate para-alkoxy side chain against Candida albicans, the cut-off effect was observed. From evaluated homological series, the maximum of the effectiveness was noticed for the stucture 6 k (MIC = 0.39 mg/mL), containing para-propoxy group attached to phenylcarbamoyloxy fragment, beyond which the compounds ceased to be active. On the contrary, all the tested molecules were against Staphylococcus aureus and Escherichia coli (MICs > 1.00 mg/mL) practically inactive. PMID:24294237

  20. Estados Unidos y cuatro pases de Amrica Latina se unen para combatir el cncer

    Cancer.gov

    El Instituto Nacional del Cncer (NCI) de Estados Unidos formaliz esta semana alianzas bilaterales con los gobiernos de Argentina, Brasil, Mxico y Uruguay, para acelerar el avance contra el cncer en la poblacin hispana de Estados Unidos y de Amrica Latina y mejorar la investigacin del cncer.

  1. Mtodos de depuracin HW-SW para sistemas on chip reconfigurables

    Microsoft Academic Search

    Guillermo Talavera; Vincent Nollet; Jean-Yves Mignolet; Diederick Verkest; Rudy Lauwereins; Jordi Carrabina

    El dinamismo de las aplicaciones en sistemas on chip reconfigurables re- quiere un eficiente uso de los recursos disponibles. Para permitir la asignacin en tiempo real de los recursos, el sistema operativo y la plataforma SoC reconfigurable han de estar diseadas en paralelo. En este contexto, el desarrollo del hardware y software encastado presenta los inconvenientes individuales de cada uno,

  2. Sensores CMOS para robotica e industria: Sensor ret nico espacio variante y vision activa

    E-print Network

    Valencia, Universidad de

    Sensores CMOS para robotica e industria: Sensor ret nico espacio variante y vision activa Fernando Pardo, Francisco Vegara, Jose A. Boluda, Santiago Felici Instituto de Robotica Universidad de Valencia C venido estudiando especialmente en el terreno de aplicaciones en robotica 2]. Sin em- bargo, en el

  3. AstroFcil: Sistema Computacional Embarcado para Automatizao de Telescpios de Pequeno Porte

    Microsoft Academic Search

    Marcos Roberto Silva; Maicon Carlos Pereira; Caroline Farias Salvador; Rafael Luiz Cancian; Roberto Miguel Torres; Cesar Albenes Zeferino

    2006-01-01

    O uso de telescpios de pequeno porte na observao astronmica amadora muitas vezes restringido pela dificuldade que astrnomos amadores enfrentam para localizar um astro desejado e acompanh-lo no cu. Este artigo apresenta o desenvolvimento de um sistema embarcado a ser utilizado na automao de telescpios de pequeno porte visando facilitar a operao desses equipamentos por amadores. O sistema

  4. Mdulo II.-Amenazas para la biodiversidad l La sexta gran extincin

    E-print Network

    Rey Benayas, Jos Mara

    Mdulo II.- Amenazas para la biodiversidad l La sexta gran extincin l Cambio global l Causas y ejemplos de extincin y amenaza Fecha actualizacin: 14-11-13 #12;n La diversidad de especies en la Tierra riesgo de extincin global desde 1980 #12;Geografa de las amenazas a la seguridad del agua y la

  5. Tutorial sobre o uso de Geotecnologias no estudo de Bacias Hidrogrficas para professores da Educao Bsica

    E-print Network

    Tutorial sobre o uso de Geotecnologias no estudo de Bacias Hidrogrficas para professores da of hydrographic basing degradation, a tutorial was developed for secondary school teachers to use in environmental education and other environmentally-based subjects. This tutorial gives them the possibility of performing

  6. Regulamenta os procedimentos para a alocao de vagas docentes de Magistrio Superior da

    E-print Network

    Liu, I-Shih

    Universidade Federal do Rio de Janeiro. O Conselho de Ensino de Graduao (CEG) e o Conselho de Ensino para 2006; Considerando: a. que a admisso de professores na Universidade Federal do Rio de Janeiro um Universidade Federal do Rio de Janeiro; d. que o banco de professores-equivalente corresponder soma dos

  7. Para-Professionals in Further Education: Changing Roles in Vocational Delivery

    ERIC Educational Resources Information Center

    Scott, Gill

    2005-01-01

    Roles and structures within further education colleges seem to be in constant change and development; roles are becoming blurred, and lecturers are taking on more management tasks. Alongside this has been the development of para-professional roles, using non-lecturers to undertake teaching tasks. This can allow for the greater involvement of

  8. Involvement of mitochondrial ferredoxin and para-aminobenzoic acid in yeast coenzyme Q biosynthesis

    E-print Network

    Boyer, Edmond

    1 Involvement of mitochondrial ferredoxin and para-aminobenzoic acid in yeast coenzyme QABA is a precursor of yeast coenzyme Q *Manuscript Click here to view linked References #12;2 Summary Yeast ubiquinone or coenzyme Q6 (Q6) is a redox active lipid with a crucial role in the mitochondrial electron

  9. Computer-controlled radiation therapy machine for pelvic and para-aortic nodal areas

    Microsoft Academic Search

    Lee M. Chin; Peter K. Kijewski; Gran K. Svensson; John T. Chaffey; Martin B. Levene; B. E. Bjaerngard

    1981-01-01

    A computer-controlled radiation therapy technique has been developed to treat cancer of the uterine cervix that has extended to the pelvic and para-aortic lymph nodes. During five longitudinal scans with a 4 cm wide 8 MV X ray beam, conformation of the high dose region to the target volume was achieved primarily by varying the other field dimensions. Treatment planning

  10. Hacia un framework Orientado a Objetos para Bills of Materials Complejos

    Microsoft Academic Search

    Marcela Vegetti; Gabriela Henning; Horacio Leone

    Las empresas de produccin industrial se enfrentan por un lado, a los cambios constantes de las condiciones del mercado, como po r ejemplo, los patrones de demanda, ciclo de vida de los productos mucho ms cortos, etc. Por otro, a un mercado global, que requiere que la cadena de suministros, alcance muy altos niveles de eficiencia. Para mantener la competitividad

  11. Um Instrumento para a Avaliao de Estressores Psicossociais no Contexto de Emprego

    Microsoft Academic Search

    Nora Leibovich de Figueroa; Marta Schufer; Roberto Muios; Claudia Marro; Elizabeth Aranda Coria

    2001-01-01

    Resumo Os contextos onde se desenvolvem as atividades humanas apresentam caractersticas diferentes que tm importantes implicaes no momento da elaborao e aplicao de procedimentos de avaliao. O contexto de emprego muito importante para importantes setores de nossa populao. Moos desenvolveu um marco conceitual scio-ecolgico no qual a relao, entre os acontecimentos vitais estressantes e as condutas adaptativas, encontra-se influenciada

  12. Metaheurstica algoritmo gentico para soluo de problemas de planejamento florestal com restries de integridade

    Microsoft Academic Search

    Flvio Lopes Rodrigues; Helio Garcia Leite; Heleno do Nascimentos Santos; Agostinho Lopes de Souza; Gilson Fernandes da Silva

    2004-01-01

    2 RESUMO - Os objetivos deste trabalho foram desenvolver e testar um algoritmo gentico (AG) para a soluo de problemas de gerenciamento florestal com restries de integridade. O AG foi testado em quatro problemas, contendo entre 93 e 423 variveis de deciso, sujeitos s restries de singularidade, produo mnima e produo mxima, periodicamente. Todos os problemas tiveram como objetivo a

  13. Diseo y evaluacin de una interfaz mvil para lectura de medidores de energa

    Microsoft Academic Search

    Vctor lvarez-Corts; Benjamn Zayas-Prez

    2005-01-01

    El Instituto de Investigaciones Elctricas (IIE) havenido trabajando durante varios aos en el rea deAMR (Lectura Automtica de Medidores, por sus siglas eningls) as como en la deteccn del robo deenerga elctrica como lneasestratgicas para el desarrollo de infraestructura interna ytambin como respuesta a las demandas deautomatizacin de la Comisin Federal de Electricidad(CFE) y de la Compaa de Luz y

  14. Desarrollo de un servidor HTTP para dispositivos moviles en J2ME

    Microsoft Academic Search

    Guillermo Diez-Andino Sancho; Rosa Ma Garc; Celeste Campo

    El protocolo HTTP viene siendo ampliamente utilizado desde el nacimiento de la web, en donde es indispensable para la creacion de aplicaciones que hacen uso deesta. Con la llegada de las tecnologias moviles pueden darse diversas situaciones en las que la creacion de un servidor HTTP en dispositivos limitados pueda resultar de gran utilidad. Un ejemplo, es la comparticion de

  15. Reconocimiento de Palabras Aisladas Utilizando LPC Y DTW, para control de navegacin de un

    Microsoft Academic Search

    Y. Baquero; Z. Alezones

    ResumenLa utilizacin de herramientas computacionales, hardware y software con capacidades de desarrollo en torno al manejo de modelos bioinspirados gener la construccin de un minirobot mvil aplicando la caracterizacin de comandos de voz y el aprovechamiento de las capacidades de procesamiento paralelo ofrecidas por el gene digital para gobernar la correspondiente navegacin. A nivel general en la etapa de software

  16. Esquema Adaptativo de Reserva para el Control de Admisin Jerrquico en Redes Mviles Celulares

    Microsoft Academic Search

    David Garca Roger; Jorge Martnez

    Se propone un esquema adaptativo de reserva diseado para trabajar en cooperacin con la poltica de con- trol de admisin Multiple Guard Channel (MGC). El esquema ajusta los parmetros de configuracin de MGC mediante un seguimiento continuo de la calidad de servicio (QoS) percibida por el usuario y permite adaptar la poltica a cualquier combi- nacin de trfico entrante, permitiendo

  17. Irradiation of para-aortic lymph node metastases from carcinoma of the cervix or endometrium

    SciTech Connect

    Komaki, R.; Mattingly, R.F.; Hoffman, R.G.; Barber, S.W.; Satre, R.; Greenberg, M.

    1983-04-01

    Twenty-two patients with biopsy-proved para-aortic lymph node metastases from carcinoma of the cervix (15 patients) or endometrium (7 patients) received a median dose of 5,000 rad/25 fractions. Para-aortic nodal metastases were controlled in 77% of cases. Control was significantly lower following radical retroperitoneal lymph node dissection than less extensive sampling procedures. Obstruction of the small bowel developed in 3 patients with tumor recurrence in the para-aortic region. Eight of the 10 patients who were disease-free at 2 years received >5,000 rad. Three patients were still alive without disease at 129, 63, and 60 months, respectively. The 5-year disease-free survival rate was 40% for cervical cancer and 60% for endometrial cancer: in the former group, it was significantly different depending on whether the para-aortic nodes were irradiated (40%) or not (0%). The authors suggest that 5,000-5,500 rad in 5-5.5 weeks is well tolerated and can control aortic nodal metastases in cervical and possibly endometrial cancer.

  18. Control mioelctrico para movimientos en 2D de un manipulador robtico industrial

    Microsoft Academic Search

    Natalia Lpez; Carlos Soria; Eugenio Orosco; Fernando di Sciascio; Mximo Valentinuzzi

    Resumen En este trabajo se describe un sistema de control mioelctrico de un manipulador robtico para la ejecucin de tareas sobre el plano x-y. Las seales mioelctricas provinieron de voluntarios sanos y especialmente de amputados de miembro superior conectadas mediante placas de acondicionamiento de seal y adquisicin digital al entorno MATLAB . Se compar el desempeo de parmetros descriptivos de

  19. Effect of the site of infusion of para-aminohippuric acid (PAH) on portal blood flow

    E-print Network

    Paris-Sud XI, Université de

    Effect of the site of infusion of para-aminohippuric acid (PAH) on portal blood flow LM Zeoula C requirements of animals. In this context, the determination of portal blood flow is critical. When dilution techniques are used for such measurements, eg using PAH, a homogeneous mixing of the marker in the blood

  20. ADS -Accelerator Driven System -Uma tecnologia do futuro para a produo de energia nuclear

    E-print Network

    Ribas, Roberto Vicençotto

    ADS - Accelerator Driven System - Uma tecnologia do futuro para a produção de energia nuclear 1980, quando as restrições ligadas principalmente a possíveis catástrofes relacionadas à tecnologia nessa tecnologia, que poderá ser de grande importância num futuro não muito distante. 2 #12;

  1. MINISTRIO DA CINCIA, TECNOLOGIA E INOVAO (MCTI) CONCURSO PBLICO PARA PROVIMENTO DE VAGAS EM CARGOS

    E-print Network

    1 MINISTRIO DA CINCIA, TECNOLOGIA E INOVAO (MCTI) CONCURSO PBLICO PARA PROVIMENTO DE VAGAS EM DA CINCIA, TECNOLOGIA E INOVAO, tendo em vista o disposto na Portaria n 553, de 8 de dezembro de, Planejamento e Infraestrutura em Cincia e Tecnologia e da Carreira de Desenvolvimento Tecnolgico de que trata

  2. LA ENERGA EN LA FORMACIN DE LOS SUELOS: ASPECTOS TERICOS Y METODOLGICOS PARA SU EVALUACIN

    Microsoft Academic Search

    AMRICO DEGIOANNI; ESTELA BRICCHI; EUGENIO HAMPP

    2008-01-01

    RESUMEN El suelo es un sistema abierto que tiende hacia un equilibrio dinmico acumulando y reciclando materia y energa a travs del tiempo. Mediante un balance energtico es posible evaluar la energa acumulada o la que circula a travs de su masa. Esta miscelnea tiene por objetivo presentar aspectos tericos y metodolgicos para cuantificar la energa dinamizada durante la formacin

  3. SISTEMA PARA GESTIONAR LA ACTIVIDAD CIENTFICA DEL DEPARTAMENTO DE INFORMTICA DE LA UNIVERSIDAD DE GUANTNAMO

    Microsoft Academic Search

    Denis Boizan Romero

    2012-01-01

    El sistema para gestionar la actividad cientfica del Departamento de Informtica de la Universidad de Guantnamo surge debido a la necesidad de gestionar de manera ms rpida, segura y eficaz los procesos que se desarrollan actualmente en dicho centro. Fue desarrollado utilizando los lenguajes PHP del lado del servidor con CodeIgniter como framework y JavaScript del lado del cliente. Se

  4. BIOCOMBUSTVEIS E COMRCIO INTERNACIONAL: OPORTUNIDADES E DESAFIOS PARA AMRICA LATINA E CARIBE

    Microsoft Academic Search

    Andr Luiz Marques Ks; Mario Miguel Amin Garcia Herreros; Heriberto Wagner Amanajs Pena

    2011-01-01

    O grande desafio do mundo nos prximos anos ser convergir desenvolvimento econmico com sustentabilidade. Nesse sentido a busca para ampliar a participao de energias sustentveis nas matrizes energticas tanto pases de desenvolvidos como de pases em desenvolvimento dever cada vez sofrer mais presso da comunidade internacional. Nesse ambiente alguns pases da America Latina e Caribe podem beneficiar-se, j que possuem

  5. ALTERNATIVAS PARA A GERAO DE ENERGIA RENOVVEL NO BRASIL: A OPO PELA BIOMASSA

    Microsoft Academic Search

    Mariane Silva Marconato; Giuliana Aparecida Santini

    2008-01-01

    Durante muito tempo, os recursos fsseis e hdricos foram os grandes propulsores da civilizao e da economia. O Brasil tambm se apoiou nessas fontes energticas para o desenvolvimento de atividades industriais, agrcolas, de servios e da prpria sociedade. Entretanto, vive-se hoje uma crise no abastecimento energtico, em funo da problemtica geopoltica, econmica e ambiental em torno da extrao e comercializao

  6. Modelo para la reduccin del ciclo de desarrollo de software basado en CMM. Francisco J. ALVAREZ.

    E-print Network

    Weitzenfeld, Alfredo

    alto costo de implementacin de modelos y la disminucin de productividad en el perodo de aprendizaje: Calidad de Software, Procesos de desarrollo, CMM (Capability Maturity Model), KPA's (Key Process Areas desarrollo lograran el estandarizar procesos e incrementar la calidad de los productos. Para adoptar el CMM

  7. PROCEDIMIENTO PARA EL DIAGNSTICO DE LA LOGSTICA INTERNA APLICADO EN UNA EMPRESA DE SERVICIOS EXTRAHOTELEROS

    Microsoft Academic Search

    Damaris Valds Ferrer

    2012-01-01

    En este trabajo se presenta un procedimiento para realizar el diagnstico de la logstica interna, el cual fue aplicado en una empresa de servicios extrahoteleros. A partir de su aplicacin se determin un banco de problemas teniendo en cuenta las principales dificultades encontradas, as como un conjunto de acciones que le permitieron a la entidad mejorar los niveles de eficiencia

  8. PROCEDIMIENTO PARA LA PLANEACIN INTEGRAL DEL CAPITAL HUMANO EN ENTIDADES LOGSTICAS

    Microsoft Academic Search

    Daniel Machado Labrada; Margarita de Miguel Guzmn; Clara Marrero Fornaris

    2011-01-01

    Este trabajo tiene como objetivo proponer un procedimiento para la planeacin integral del capital humano aplicado a Empresas Logsticas, en el mismo se tienen en cuenta los principales enfoques modernos sobre el tema, integra las actividades relacionadas con el capital humano, aborda la perspectiva cuantitativa y cualitativa, los diferentes plazos de tiempo: corto, mediano y largo, con un enfoque estratgico;

  9. Sistema informtico para gestionar la Garanta de Calidad de centros y titulaciones

    E-print Network

    Grimaldo, Francisco

    componentes de software libre Francisco Grimaldo, Jesús Santiago Aupi, Ricardo Ferrís, Vicente Cerverón desarrollo de un Sistema de Garantia Interna de Calidad (SGIC) para los centros y las titulaciones de laSQL. · Arquitectura web: J2EE, Spring, Hibernate, JavaMail... Figura 2. Proceso de orientación al estudiante en XPDL

  10. AOWE : una Metodologa Orientada a Aspectos para Desarrollo de Aplicaciones Web

    Microsoft Academic Search

    Hernan Casalanguida; Juan Eduardo Duran

    Un enfoque para la separacion de intereses que ha cobrado cada vez mas importancia en la ultima decada es la orientacion a aspec- tos, debido a que permite evitar que un mismo interes este re?ejado en el dise~no en varios modulos o clases y que un mismo modulo o clase con- temple distintos intereses. Existe una carencia de metodos

  11. Desarrollo de Tcnicas Ultrasnicas para Seguimiento y Interaccin de la Marcha

    Microsoft Academic Search

    Anselmo Frizera; Rafael Raya; Juan C. Moreno; Ramn Ceres; Leopoldo Caldern

    En este trabajo se expone un sistema ultrasnico en desarrollo de captacin y seguimiento de la marcha que es empleado como entrada a un sistema de control en el que eventualmente los patrones de movimientos y posiciones constituyen realmente un medio de comunicacin ya sea de tipo general o bien para control natural de dispositivos de ayuda a la movilidad.

  12. Limnological variables and macrophyte infestation in Tucuruı reservoir - Para - Brazil

    Microsoft Academic Search

    PEREIRA FILHO; E. M. Lde. M. Novo

    2002-01-01

    This paper identified the relationship between aquatic macrophyte infestation and some limnological variables in Tucuruı reservoir, a hydroelectric power facility in Para State, northern Brazil. The spread of macrophyte stands jeopardizes environmental quality in many aspects since it is a natural habitat for the malaria vector; it is also an area of increased methane emission. On top of that, macrophyte

  13. International Collaboration and Capacity Building at the Federal University of Para, Brazil: the Geoscience Cyberinfrastructure Journey

    Microsoft Academic Search

    E. M. Cutrim; T. C. Yoksas; D. Nechet; J. Cohen

    2006-01-01

    For over three decades, the Federal University of Para (UFPA) has been committed to building faculty and student capacity through national and international collaboration. Since the early 1980s, the Meteorology Department has actively participated in a large number of international scientific experiments in the Amazon region. One difficulty in the continuation of research after the field phase was data sharing

  14. Intact cluster and chordate-like expression of ParaHox genes in a sea star

    PubMed Central

    2013-01-01

    Background The ParaHox genes are thought to be major players in patterning the gut of several bilaterian taxa. Though this is a fundamental role that these transcription factors play, their activities are not limited to the endoderm and extend to both ectodermal and mesodermal tissues. Three genes compose the ParaHox group: Gsx, Xlox and Cdx. In some taxa (mostly chordates but to some degree also in protostomes) the three genes are arranged into a genomic cluster, in a similar fashion to what has been shown for the better-known Hox genes. Sea urchins possess the full complement of ParaHox genes but they are all dispersed throughout the genome, an arrangement that, perhaps, represented the primitive condition for all echinoderms. In order to understand the evolutionary history of this group of genes we cloned and characterized all ParaHox genes, studied their expression patterns and identified their genomic loci in a member of an earlier branching group of echinoderms, the asteroid Patiria miniata. Results We identified the three ParaHox orthologs in the genome of P. miniata. While one of them, PmGsx is provided as maternal message, with no zygotic activation afterwards, the other two, PmLox and PmCdx are expressed during embryogenesis, within restricted domains of both endoderm and ectoderm. Screening of a Patiria bacterial artificial chromosome (BAC) library led to the identification of a clone containing the three genes. The transcriptional directions of PmGsx and PmLox are opposed to that of the PmCdx gene within the cluster. Conclusions The identification of P. miniata ParaHox genes has revealed the fact that these genes are clustered in the genome, in contrast to what has been reported for echinoids. Since the presence of an intact cluster, or at least a partial cluster, has been reported in chordates and polychaetes respectively, it becomes clear that within echinoderms, sea urchins have modified the original bilaterian arrangement. Moreover, the sea star ParaHox domains of expression show chordate-like features not found in the sea urchin, confirming that the dynamics of gene expression for the respective genes and their putative regulatory interactions have clearly changed over evolutionary time within the echinoid lineage. PMID:23803323

  15. La Importancia De Las Ayudas Informticas Para Los Anlisis Ergonmicos En El Diseo Industrial. Caso: la implementacin de la silla sit-stand para las cajeras de supermercado en el estado de Quebec - Canad

    Microsoft Academic Search

    Alvaro Enrique Diaz

    El diseo industrial est estrechamente relacionado con las necesidades de los diferentes utilizadores (clientes) y con el desarrollo de nuevos productos; en este proceso para llegar a los resultados esperados, el diseador debe establecer las soluciones que deben satisfacer las necesidades encontradas. Para llegar a los objetivos, el producto debe ser pasado por diversas validaciones y verificaciones. Los anlisis ergonmicos

  16. MECANISMOS PARA LA CREACIN DE HROES Y ANTI HROES PARA LA OPININ PBLICA INTERNACIONAL EN PERIODOS DE GUERRA HOW MEDIA CREATES HEROS AND ANTIHEROS FOR THE INTERNATIONAL PUBLIC OPINION IN WAR PERIODS

    Microsoft Academic Search

    Garca Gordillo

    La intencin principal de esta investigacin es encontrar las claves que se utilizan a diario en los medios de comunicacin para crear, de cara a la opinin pblica, hroes y anti -hroes en periodos de crisis internacional como los que se vienen viendo desde el pasado 11 de septiembre. Para plantear esta investigacin partimos de dos ideas. La primera de

  17. Ancient origins of axial patterning genes: Hox genes and ParaHox genes in the Cnidaria.

    PubMed

    Finnerty, J R; Martindale, M Q

    1999-01-01

    Among the bilaterally symmetrical, triploblastic animals (the Bilateria), a conserved set of developmental regulatory genes are known to function in patterning the anterior-posterior (AP) axis. This set includes the well-studied Hox cluster genes, and the recently described genes of the ParaHox cluster, which is believed to be the evolutionary sister of the Hox cluster (Brooke et al. 1998). The conserved role of these axial patterning genes in animals as diverse as frogs and flies is believed to reflect an underlying homology (i.e., all bilaterians derive from a common ancestor which possessed an AP axis and the developmental mechanisms responsible for patterning the axis). However, the origin and early evolution of Hox genes and ParaHox genes remain obscure. Repeated attempts have been made to reconstruct the early evolution of Hox genes by analyzing data from the triphoblastic animals, the Bilateria (Schubert et al. 1993; Zhang and Nei 1996). A more precise dating of Hox origins has been elusive due to a lack of sufficient information from outgroup taxa such as the phylum Cnidaria (corals, hydras, jellyfishes, and sea anemones). In combination with outgroup taxa, another potential source of information about Hox origins is outgroup genes (e.g., the genes of the ParaHox cluster). In this article, we present cDNA sequences of two Hox-like genes (anthox2 and anthox6) from the sea anemone, Nematostella vectensis. Phylogenetic analysis indicates that anthox2 (= Cnox2) is homologous to the GSX class of ParaHox genes, and anthox6 is homologous to the anterior class of Hox genes. Therefore, the origin of Hox genes and ParaHox genes occurred prior to the evolutionary split between the Cnidaria and the Bilateria and predated the evolution of the anterior-posterior axis of bilaterian animals. Our analysis also suggests that the central Hox class was invented in the bilaterian lineage, subsequent to their split from the Cnidaria. PMID:11324016

  18. LA TERAPIA FACILITADA POR ANIMALES DE COMPAA COMO PROGRAMA DE REHABILITACIN ADJUNTO PARA PERSONAS CON DIAGNSTICO DE ESQUIZOFRENIA CRNICA

    Microsoft Academic Search

    Victoria Villalta Gil; Susana Ochoa Gerre

    2007-01-01

    Coincidiendo con el surgimiento de la psiquiatra comunitaria, ha habido un progresivo proceso de desinstitucionalizacin de los pacientes psiquitricos; seleccionando a los menos discapacitados para los recursos comunitarios y dejando los pacientes con ms discapacidad al cuidado de las instituciones. La rehabilitacin pretende afrontar la discapacidad para realizar actividades, con la finalidad de mejorar la desventaja social consecuencia del deterioro

  19. BUSCA LOCAL PARA POS-PROCESSAMENTO EM RESULTADOS DE OTIMIZAC~AO MULTI-OBJETIVO EM REDES DE FILAS

    E-print Network

    Cruz, Frederico

    BUSCA LOCAL PARA POS-PROCESSAMENTO EM RESULTADOS DE OTIMIZAC~AO MULTI-OBJETIVO EM REDES DE FILAS otimizac~ao de redes de filas finitas, a capacidade total do sistema em areas de espera deve ser a menor algoritmo simulated annealing foi desenvolvido, especialmente para redes de filas finitas, produzindo solu

  20. Bacillus subtilis Soj (ParA): The involvement of DNA binding and dynamic localization in plasmid partitioning

    E-print Network

    Hester, Christina Marie

    2008-05-08

    The ParA family of ATPases encompasses proteins with a wide variety of functions. The prototype of this family is the ParA ATPase from the P1 prophage plasmid, which, along with ParB and the parS binding site, is required for the faithful...

  1. La UA dirige un programa para prevenir conductas adictivas en los ms jvenes a travs del deporte

    E-print Network

    Escolano, Francisco

    La UA dirige un programa para prevenir conductas adictivas en los más jóvenes a través del deporte la Diputación de Alicante, han puesto en marcha un programa para prevenir conductas adictivas y impacto y cambios de conducta en los jóvenes", explica Carreres. Juan M. Cortell, vicedecano de Ciencias

  2. Thouless theorem for one and two degrees of freedom (Teorema de Thouless para um e dois graus de liberdade)

    Microsoft Academic Search

    A. R. Bosco de Magalhaes; Avila Fonseca; M. C. Nemes

    Realizamos uma demonstracao acess ivel do teorema de Thouless para um ou dois graus de liberdade, usando somente mecanica quantica elementar. Este teoremae especialmenteutil para encontrar o vacuo relativo au m conjunto de operadores bosonicos transformados. Outra motivacaoe a existencia de experimentos envolvendo ions capturados ou campos em eletrodinamica quantica de cavidades, usualmente modelados por osciladores harmonicos interagindo linearmente.

  3. TRIBUNAL REGIONAL FEDERAL DA 1 REGIO Edital de divulgao de Sesso Pblica para julgamento dos recursos interpostos da 1

    E-print Network

    Maier, Rudolf Richard

    TRIBUNAL REGIONAL FEDERAL DA 1 REGIO Edital de divulgao de Sesso Pblica para julgamento dos de Juiz Federal Substituto da 1 Regio O Presidente da Comisso do XIV Concurso Pblico para Provimento de Cargo de Juiz Federal Substituto da 1 Regio, no uso de suas atribuies, comunica que

  4. Characterization of the axon initial segment (AIS) of motor neurons and identification of a para-AIS

    E-print Network

    Paris-Sud XI, Université de

    Characterization of the axon initial segment (AIS) of motor neurons and identification of a para-AIS and a juxtapara-AIS, organized by protein 4.1B Duflocq et al. Duflocq et al. BMC Biology 2011, 9:66 http initial segment (AIS) of motor neurons and identification of a para-AIS and a juxtapara-AIS, organized

  5. EVALUATION OF PARA-DICHLOROBENZENE EMISSIONS FROM SOLID MOTH REPELLANT AS A SOURCE OF INDOOR AIR POLLUTION

    EPA Science Inventory

    Mothcakes made of para-dichlorobenzene have been widely available for the general population to be used as a moth repellant to protect garments from insect damage. Usually, a mothcake is expected to last for weeks or even months during which the para-dichlorobenzene emits slowly ...

  6. Diseo y desarrollo del subsistema de deteccin y reaccin de una plataforma para la prevencin de ataques coordinados

    Microsoft Academic Search

    Sergio Castillo; Joaqun Garca; Joan Borrell

    Resumen. Uno de los requisitos imprescindibles para el xito en el comercio electrnico es el de proporcionar confianza y seguridad. A pesar del gran avance en este mbito, tales como sistemas cortafuegos, mecanismos de autenticacin y sistemas para la deteccin de intrusos, la mayora de las infraestructuras que respaldan el comercio electrnico son actualmente vulnerables a sufrir un gran nmero

  7. Entornos Operativos para la Gestin de Recursos...Dept. d'Arquitectura de Computadors Execution Environments for

    E-print Network

    Corbalan, Julita

    Entornos Operativos para la Gestin de Recursos...Dept. d'Arquitectura de Computadors UPC Execution Environments for Parallel Applications Master CANS 2007/2008 Departament d'Arquitectura de Computadors Universitat Politcnica de Catalunya #12;Dept. d'Arquitectura de Computadors Entornos Operativos para la

  8. Lmite de prazas para o curso 2014-2015 Consello de Goberno da UDC 27 de marzo de 2014

    E-print Network

    Fraguela, Basilio B.

    Direccin de Empresas 180 180 Grao en Arquitectura 200 200 Grao en Arquitectura Tcnica 190 160(1) Grao en Arquitectura Tcnica 301 Simultaneidade de estudos dos Graos en CC. Empresariais e Turismo 30 30 DILIXENCIA e Arquitectura Tcnica. Ofrtanse 30 prazas para a simultaneidade e mantense 90 prazas para o grao

  9. Directrices de consenso en el campo de las microfinanzas: Definicin de trminos, coeficientes y ajustes financieros para las microfinanzas

    Microsoft Academic Search

    Damian von Stauffenberg; Frank Abate; Tillman Bruett; Isabelle Barres; Robert Peck Christen; Richard Rosenberg; Dana de Kanter; Tor Jansson; Barry Lennon; Alice Negre; Sanjay Singha

    2003-01-01

    El propsito de este documento es proponer una definicin estndar para cada uno de los trminos financieros seleccionados y plantear un mtodo comn de clculo para determinados coeficientes financieros. Fue producido en colaboracin entre el Banco Interamericano de Desarrollo (BID) y el Grupo Consultivo de Ayuda a la Poblacin ms Pobre (CGAP) del Banco Mundial, con los aportes de varias

  10. Mtodo de Prueba GAED: Tiempo ptimo para el Reemplazo de CAG en Plantas de Tratamiento de Agua Potable

    Microsoft Academic Search

    Por Henry Nowicki; H. George Nowicki; Wayne Schuliger; Barbara Sherman

    l carbn activado granular (CAG) no dura para siempre en una planta de tratamiento de agua (PTA), su rendimiento no necesita ser monitoreado peridicamente, y deber ser reemplazado con CAG fresco, no usado o reactivado. El CAG usado, que se remueve, puede ser reactivado en plantas dedicadas a carbones de agua potable para ser retornado a la planta. Los reactivadores

  11. COMPARACIN DE VARIOS MTODOS PARA LA REPRESENTACIN CARTOGRFICA DE INFORMACIN CLIMTICA EN ZONAS ALTAS DEL ESTADO LARA

    Microsoft Academic Search

    Jorge Lpez Mrquez; Rigoberto Andressen

    2001-01-01

    Se compararon tres mtodos cartogrficos diferentes para la representacin de aspectos climticos (temperatura y precipitacin) en zonas altas del estado Lara. Se us conjuntamente A) Representacin analgica (en papel), B) Mapas digitalizados de coberturas mediante el software para Sistema de Informacin Geogrfica (SIG) ArcInfo y C) Modelos numricos interpolados mediante software de aplicacin geoestadstica (SURFER), empleando el modelo de interpolacin

  12. STRATIFIED\\/PCA: UN MTODO DE PROCESAMIENTO DE DATOS Y VARIABLES PARA LA CONSTRUCCIN DE MODELOS DE REDES NEURONALES

    Microsoft Academic Search

    Resumen. Este artculo describe un mtodo para reducir observaciones y variables contenidas en grandes archivos de datos a nuevos conjuntos de datos cuyo tamao es mucho ms reducido. Estos nuevos conjuntos son confiables para mejorar tanto en calidad como en tiempo, la construccin de los modelos de redes neuronales. El mtodo, Stratified\\/PCA utiliza la tcnica de muestreo estratificado y anlisis

  13. O recurso a veculos areos tripulados remotamente para realizar vrias tarefas, da investigao cientfica ao controlo de fronteiras,

    E-print Network

    Instituto de Sistemas e Robotica

    TECNOLOGIA DRONES PARA TODO O SERVI?O O recurso a veículos aéreos tripulados remotamente para privacidade aumentam TEXTOS DE ALEXANDRA SIM?ES DE ABREU FOTOGRAFIAS DE NUNO BOTELHO UAV, VANT, RPA, drones falar mais dos drones (zangões em portu- guês), nomeadamente com fins mi- litares -- podem realizar

  14. Comienza la construccin de instalacin patrocinada por el NCI en Puerto Rico para realizar estudios clnicos sobre el cncer

    Cancer.gov

    El gobierno de Puerto Rico ha destinado $196 millones de dlares para construir un hospital oncolgico de 287 000 pies cuadrados en San Juan, que contar con 96 camas. El nuevo hospital es el primero en su clase en la regin caribea y en l se llevarn a cabo tratamientos para el cncer y estudios clnicos.

  15. Instrumentos para la conservacin de la Diversidad Biolgica y los HbitatsDiversidad Biolgica y los Hbitats

    E-print Network

    Rodrguez, Miguel ngel

    Instrumentos para la conservacin de la Diversidad Biolgica y los HbitatsDiversidad Biolgica y. 5 de Biologa. 2011-12 Jess ngel Cuevas MorenoJess ngel Cuevas Moreno #12;Instrumentos para la. Principales impulsores de la prdida de Diversidad Biolgica y los hbitats Instrumentos de conservacin

  16. Zoneamento agrcola e poca de semeadura para trigo no Brasil Agricultural zoning and sowing dates for wheat in Brazil

    Microsoft Academic Search

    Gilberto Rocca da Cunha; Joo Carlos Haas; Jaime Ricardo; Tavares Maluf; Paulo Henrique Caramori; Eduardo Delgado Assad; Hugo Jos Braga; Jurandir Zullo Jr; Cludio Lazzarotto; Srgio Gonalves; Marcos Wrege; Dionsio Brunetta; Srgio Roberto Dotto; Hilton Silveira Pinto; Orivaldo Brunini; Vera Magali; Radtke Thom; Srgio Luiz Zampieri; Aldemir Pasinato; Mrcia Barrocas Moreira Pimentel; Cristina Pandolfo

    2001-01-01

    Resumo - Um Programa de Zoneamento Agrcola para o Brasil, subsidiando a poltica de crdito e securidade rural, comeou a ser posto em prtica pelo Ministrio da Agricultura, Pecuria e Abastecimento (MAPA) a partir da safra de inverno de 1996, com a cultura de trigo no sul do Brasil. Este artigo apresenta uma sntese dos trabalhos sobre zoneamento agrcola para

  17. Ambulacrarian prototypical Hox and ParaHox gene complements of the indirect-developing hemichordate Balanoglossus simodensis.

    PubMed

    Ikuta, Tetsuro; Miyamoto, Norio; Saito, Yasunori; Wada, Hiroshi; Satoh, Nori; Saiga, Hidetoshi

    2009-07-01

    The Hox genes and its evolutionary sister, the ParaHox genes, are widely distributed among animals. Although it has been expected that hemichordates and echinoderms have a single set of Hox genes and most likely a single set of ParaHox genes, it is not known whether the ortholog of Hox8 is absent in hemichordates, and in turn, consensus view about Hox/ParaHox gene complements in hemichordates has not been established. In this study, we isolated either complete or nearly complete coding sequences of 12 Hox genes, including the ortholog of the Hox8 that has not been reported in the previous studies, and three ParaHox genes from the recently discovered indirect-developing acorn worm, Balanoglossus simodensis. Our data suggest that the ancestral hemichordate had intact complements of ambulacrarian prototypical Hox and ParaHox genes, consisting of 12 and three members, respectively. PMID:19669790

  18. Saturns Tropospheric Temperatures and Para-Hydrogen Distribution from Ten Years of Cassini Observations

    NASA Astrophysics Data System (ADS)

    Fletcher, Leigh N.; Irwin, Patrick G.; Sinclair, James; Giles, Rohini; Barstow, Joanna; Achterberg, Richard K.; Orton, Glenn S.

    2014-11-01

    Cassini/CIRS observations of Saturns 10-1400 cm-1 spectrum have been inverted to construct a global record of tropospheric temperature and para-hydrogen variability over the ten-year span of the Cassini mission. The data record the slow reversal of seasonal asymmetries in tropospheric conditions from northern winter (2004, Ls=293), through northern spring equinox (2009, Ls=0) to the present day (2014, Ls=60). Mid-latitude tropospheric temperatures have cooled by approximately 4-6 K in the south and warmed by 2-4 K in the north, with the seasonal contrast decreasing with depth. CIRS detected the north polar minimum 100-mbar temperatures 6-8 years after winter solstice, whereas the south polar maximum occurred 1-2 years after summer solstice, consistent with the lag times predicted by radiative equilibrium models. Warm polar cyclones and the northern hexagon persist throughout the mission, suggesting that they are permanent features of Saturns tropospheric circulation. The 200-mbar thermal enhancement (knee) that was strongest in the summer but weak or absent in winter in 2004-2006 (Fletcher et al., 2007, Icarus 189, p.457-478) has now shifted northward and is present globally in 2014, suggestive of radiative heating in Saturns tropospheric haze layer. Saturns para-H2 fraction, which serves as a tracer of both tropospheric mixing and the efficiency of re-equilibration between the ortho- and para-hydrogen states, is slowly altering: super-equilibrium conditions (para-H2 fraction exceeding equilibrium expectations and suggestive of subsiding airmasses) that dominated the southern summer hemisphere are now weakening, whereas the sub-equilibrium conditions (suggestive of uplift) of the northern winter are being replaced by equilibrium or super-equilibrium conditions in spring. The thermal knee and the para-H2 distribution are tracking both the increased spring illumination and the increasing tropospheric haze opacity of the springtime hemisphere observed via colour changes in visible light, suggesting a close connection between the tropospheric temperatures, para-H2 and haze characteristics.

  19. A nanoparticle catalyst for heterogeneous phase para-hydrogen-induced polarization in water.

    PubMed

    Glggler, Stefan; Grunfeld, Alexander M; Ertas, Yavuz N; McCormick, Jeffrey; Wagner, Shawn; Schleker, P Philipp M; Bouchard, Louis-S

    2015-02-16

    Para-hydrogen-induced polarization (PHIP) is a technique capable of producing spin polarization at a magnitude far greater than state-of-the-art magnets. A significant application of PHIP is to generate contrast agents for biomedical imaging. Clinically viable and effective contrast agents not only require high levels of polarization but heterogeneous catalysts that can be used in water to eliminate the toxicity impact. Herein, we demonstrate the use of Pt?nanoparticles capped with glutathione to induce heterogeneous PHIP in water. The ligand-inhibited surface diffusion on the nanoparticles resulted in a (1) H?polarization of P=0.25?% for hydroxyethyl propionate, a known contrast agent for magnetic resonance angiography. Transferring the (1) H?polarization to a (13) C?nucleus using a para-hydrogen polarizer yielded a polarization of 0.013?%. The nuclear-spin polarizations achieved in these experiments are the first reported to date involving heterogeneous reactions in water. PMID:25565403

  20. Renormalization-group approach for para-hydrogen adsorbed on exfoliated graphite

    NASA Astrophysics Data System (ADS)

    Mello, E. V. L.; Carneiro, G. M.

    1986-04-01

    Heat-capacity measurements of para-hydrogen adsorbed on graphite were performed recently and revealed an interesting phase diagram similar to 4He. We report a renormalization-group study based on a three-state Potts model with vacancies which approximates the experimental situation. The resulting global phase diagram is in a three parameter space of pair-interaction constants and chemical potential as studied by Berker, Ostlund and Putnam. The Lennard-Jones or other effective potential between the para-H 2 adsorbed molecules determines the subspace relevant to this adsorbate. A method to calculate thermodynamic densities is discussed and the resulting temperature versus density diagram agrees well with the experiment.

  1. High dose para-aortic lymph node irradiation for gynecologic cancer: technique, toxicity, and results

    SciTech Connect

    Russell, A.H.; Jones, D.C.; Russell, K.J.; Gerdes, A.J.; Figge, D.C.; Greer, B.E.; Tamimi, H.K.; Cain, J.M.

    1987-02-01

    A technique for high dose (5600-6100 cGy) extended field irradiation to the para-aortic lymph nodes is described. Fourteen patients have been treated with this technique, of whom 10 have had histologic confirmation of para-aortic node metastases. With follow-up ranging from 11 to 78 months, 7 of 14 patients are alive and clinically cancer-free. Acute effects of extended field treatment on patient weight and circulating blood counts are analyzed, and late treatment morbidity assessed. The findings suggest that such treatment, executed with modern equipment and appropriate technique, is not significantly more hazardous than pelvic irradiation, and can result in a substantial probability of disease-free survival.

  2. Incentivos para atraer y retener personal de salud de zonas rurales del Per: un estudio cualitativo

    PubMed Central

    Huicho, Luis; Canseco, Francisco Dez; Lema, Claudia; Miranda, J. Jaime; Lescano, Andrs G.

    2014-01-01

    El objetivo fue identificar incentivos de atraccin y retencin en zonas rurales y distantes de Ayacucho, Per. Fueron realizadas entrevistas en profundidad con 80 mdicos, enfermeras, obstetras y tcnicos (20 por grupo) de las zonas ms pobres y con 11 funcionarios. No existen polticas sistemticas de atraccin y retencin de personal de salud en Ayacucho. Los principales incentivos, en orden de importancia, fueron mejoras salariales, oportunidades de formacin y capacitacin, estabilidad laboral y nombramiento, mejoras en infraestructura y equipos, e incremento del personal. Se mencionaron tambin mejoras en la vivienda y alimentacin, mayor cercana con la familia y reconocimiento por el sistema de salud. Existen coincidencias y singularidades entre los distintos grupos sobre los incentivos clave para estimular el trabajo rural, que deben considerarse al disear polticas pblicas. Las iniciativas del Estado deben comprender procesos rigurosos de monitoreo y evaluacin, para asegurar que las mismas tengan el impacto deseado. PMID:22488318

  3. H2CS abundances and ortho-to-para ratios in interstellar clouds

    NASA Technical Reports Server (NTRS)

    Minh, Y. C.; Irvine, W. M.; Brewer, M. K.

    1991-01-01

    Several H2CS ortho and para transitions have been observed toward interstellar molecular clouds, including cold, dark clouds and star-forming regions. H2CS fractional abundances f(H2CS) about 1-2 10 to the -9th relative to molecular hydrogen toward TMC-1, Orion A, and NGC 7538, and about 5 10 to the -10th for L134N are derived. The H2CS ortho-to-para ratios in TMC-1 are about 1.8 toward the cyanopolyyne peak and the ammonia peak, which may indicate the thermalization of H2CS on 10 K grains. A ratio of about 3, the statistical value, for Orion (3N, 1E) and NGC 7538 is derived, while a value of about 2 for Orion (KL) is found.

  4. Molecular Characterization of Neurally Expressing Genes in the Para Sodium Channel Gene Cluster of Drosophila

    PubMed Central

    Hong, C. S.; Ganetzky, B.

    1996-01-01

    To elucidate the mechanisms regulating expression of para, which encodes the major class of sodium channels in the Drosophila nervous system, we have tried to locate upstream cis-acting regulatory elements by mapping the transcriptional start site and analyzing the region immediately upstream of para in region 14D of the polytene chromosomes. From these studies, we have discovered that the region contains a cluster of neurally expressing genes. Here we report the molecular characterization of the genomic organization of the 14D region and the genes within this region, which are: calnexin (Cnx), actin related protein 14D (Arp14D), calcineurin A 14D (CnnA14D), and chromosome associated protein (Cap). The tight clustering of these genes, their neuronal expression patterns, and their potential functions related to expression, modulation, or regulation of sodium channels raise the possibility that these genes represent a functionally related group sharing some coordinate regulatory mechanism. PMID:8849894

  5. Development of an integrated remote monitoring technique and its application to para-stressing bridge system

    NASA Astrophysics Data System (ADS)

    Miyamoto, Ayaho; Motoshita, Minoru; Casas, Joan R.

    2013-12-01

    Bridge monitoring system via information technology is capable of providing more accurate knowledge of bridge performance characteristics than traditional strategies. This paper describes not only an integrated Internet monitoring system that consists of a stand-alone monitoring system (SMS) and a Web-based Internet monitoring system (IMS) for bridge maintenance but also its application to para-stressing bridge system as an intelligent structure. IMS, as a Web-based system, is capable of addressing the remote monitoring by introducing measuring information derived from SMS into the system through Internet or intranet connected by either PHS or LAN. Moreover, the key functions of IMS such as data management system, condition assessment, and decision making with the proposed system are also introduced in this paper. Another goal of this study is to establish the framework of a para-stressing bridge system which is an intelligent bridge by integrating the bridge monitoring information into the system to control the bridge performance automatically.

  6. EL PROGRAMA CITI: UNA ALTERNATIVA PARA LA CAPACITACIN EN TICA DE LA INVESTIGACIN EN AMRICA LATINA

    PubMed Central

    Litewka, Sergio; Goodman, Kenneth; Braunschweiger, y Paul

    2011-01-01

    El Programa CITI (Collaborative Institutional Training Initiative) es un curso basado en Internet y desarrollado por voluntarios, que brinda material educacional sobre proteccin de sujetos humanos en investigaciones biomdicas y de conducta, buenas prcticas clnicas, conducta responsable de la investigacin y trato humanitario a animales de laboratorio. Es un esfuerzo conjunto del Fred Hutchinson Cancer Research Center y la Universidad de Miami. Con la colaboracin de expertos locales, gran parte del contenido se ha adaptado para Amrica Latina, se ha traducido al espaol y portugus y se han establecido acuerdos de colaboracin con instituciones especializadas en biotica en Chile, Brasil, Costa Rica y Per. Los autores presentan una metodologa accesible para la capacitacin en tica de la investigacin y una justificacin de su uso y difusin en Amrica Latina PMID:21687817

  7. Desarrollo de un receptor polarimtrico en banda S para aplicacin en estudios radioastronmicos

    NASA Astrophysics Data System (ADS)

    Barberis, C. M.; Bava, J. A.; Sanz, A. J.

    Desde el punto de vista tecnolgico, el objetivo principal de este proyecto es desarrollar un cabezal de receptor en la frecuencia de 3.3 GHz, con una temperatura del sistema de 60 K y un ancho de banda de 140 MHz. El mismo ser instalado en el foco primario de un reflector parablico de 30 metros de dimetro que funcionar como radimetro en el IAR. El receptor es del tipo polarimtrico, con lo cual permite la posibilidad de obtener las componentes de polarizacin lineal y circular. Para tal fin el cabezal constar de dos ramas receptoras que amplificarn la seal y la trasladarn a una frecuencia menor, (frecuencia intermedia), permitiendo de esa forma un mejor transporte de la seal a la sala de control para su posterior procesamiento. El receptor, adems de tener caractersticas polarimtricas, podr ser usado en el contnuo y en la lnea, utilizando las ventajas observacionales y de procesamiento de seal que actualmente posee el IAR.

  8. Modelizacion, control e implementacion de un procesador energetico paralelo para aplicacion en sistemas multisalida

    NASA Astrophysics Data System (ADS)

    Ferreres Sabater, Agustin

    Cualquier sistema electronico que incluya un procesado o tratamiento de la senal, y ademas, algun tipo de actuador mecanico generalmente necesita, como minimo, dos tensiones diferentes de alimentacion. Excluyendo los sistemas de alimentacion distribuida, la solucion tecnica mas utilizada para proporcionar dos o mas tensiones consiste en las fuentes de alimentacion multisalida. En una fuente de alimentacion multisalida los diferentes circuitos que conforman cada salida comparten un mismo transformador de potencia optimizando coste, masa, y volumen. Las ventajas obtenidas con este procedimiento tienen en su contra el efecto que sobre cada salida individual provocan las demas en su conjunto debido, principalmente, a los efectos de los elementos parasitos de los componentes. Un cambio de carga en una de las salidas produce un transitorio que es visto por todas las demas como un efecto de impedancia cruzada, y al final del transitorio, la tension de cada salida es diferente respecto a la que tenian antes del transitorio. Este ultimo resultado se conoce como regulacion cruzada. La disminucion de los efectos de la regulacion cruzada ha sido objeto de estudio durante los ultimos anos. El objetivo ha sido el desarrollo de distintas estrategias que permiten, desde disminuir los efectos de la regulacion cruzada hasta los niveles deseables, a eliminarla completamente. El resultado final suele suponer una penalizacion sobre el diseno del sistema directamente proporcional al grado de regulacion a conseguir en las distintas salidas. Entre las soluciones propuestas para eliminar la regulacion cruzada las tecnicas de post-regulacion se han consolidado como la opcion mas aceptada ya que, pueden aplicarse a cualquier convertidor y no suponen ninguna complejidad adicional a la hora de plantear el diseno. En esta Tesis Doctoral se abordara el estudio de la tecnica conocida como postregulacion mediante transformador controlado, que si bien se ha empleado en convertidores resonantes, su modelizacion, y aplicacion en convertidores PWM, esta aun por estudiar y valorar. El primer Capitulo consiste en una breve introduccion al problema de la regulacion cruzada y la impedancia cruzada para posteriormente describir las tecnicas de post-regulacion actualmente mas empleadas, con especial atencion al post-regulador con transformador controlado. El Capitulo segundo trata del estudio de las caracteristicas estaticas del postregulador con transformador controlado. Partiendo de los estudios disponibles sobre el postregulador se plantean mejoras en su modo de actuacion y se discuten tres alternativas diferentes para controlar el transformador. Las dos primeras consisten en emplear un convertidor auxiliar Boost en sus dos modos de funcionamiento, continuo y discontinuo. La tercera consiste en controlar el transformador con una tension PWM directamente, sin filtrado. Finalmente se comprueba experimentalmente, para el estado estacionario, el funcionamiento del post-regulador para cada uno de los tres metodos de control. El Capitulo tercero trata de la dinamica de la salida controlada con el post-regulador cuando este emplea un convertidor auxiliar tipo Boost. Mediante la tecnica de promediado de variables de estado se propone el modelo de pequena senal, tanto para el modo continuo como para el modo discontinuo de funcionamiento del convertidor auxiliar. Los resultados mas significativos de esta seccion son las expresiones analiticas de las impedancias cruzadas y de la impedancia de la salida post-regulada. Como complemento al modelo de pequena senal se plantea un modelo de gran senal implementado sobre el simulador Pspice. Con este nuevo modelo se reproducen los resultados obtenidos con el modelo de pequena senal y ademas es posible simular los transitorios en las tensiones de salida ante cambios de carga. La modelizacion del convertidor cuando el transformador se controla con una tension PWM sin filtrar es el objetivo del Capitulo 4. En las secciones siguientes del Capitulo se plantea el correspondiente modelo de gran senal aplicado a un nuevo prototipo exper

  9. Kinetic energy of solid and liquid para-hydrogen: a path integral Monte Carlo simulation

    NASA Astrophysics Data System (ADS)

    Zoppi, Marco; Neumann, Martin

    1992-06-01

    The translational (center of mass) kinetic energy of solid and liquid para-hydrogen have been recently measured by means of Deep Inelastic Neutron Scattering. We have evaluated the same quantity, in similar thermodynamic conditions, by means of Path Integral Monte Carlo computer simulation, modelling the system as composed of a set of spherical molecules interacting through a pairwise additive Lennard-Jones potential. In spite of the crude approximations on the interaction potential, the agreement is excellent. The pressure was also computed by means of the same simulations. This quantity, compared with the equation of state for solid para-hydrogen given by Driessen and Silvera, gives an agreement of a lesser quality and a negative value for the liquid state. We attribute this discrepancy to the limitations of the Lennard-Jones potential.

  10. Improvement of some pharmaceutical properties of mycophenolate mofetil (MMF) by para sulphonatocalix[4]resorcinarene inclusion complex

    Microsoft Academic Search

    Shobhana K. Menon; Nishith R. Modi; Bhoomika Mistry; Kuldeep Joshi

    2011-01-01

    As a part of our investigations to unfold the chemistry of calixresorcinarene, we have focused on the formation of inclusion\\u000a complex of a poorly soluble (43?gml?1 at pH 7) drug mycophenolate mofetil (MMF) an immunosuppressive agent and an inosine monophosphate dehydrogenase (IMPDH) inhibitor\\u000a with para sulphonatocalix[4]resorcinarene (PSC4R). The complete complexation of the drug was achieved after 48h of stirring\\u000a with

  11. Programao 1 Encontro para Estudos em Polticas e Prticas de Educao Ambiental

    E-print Network

    Souza, Max O.

    Programação 1º Encontro para Estudos em Políticas e Práticas de Educação Ambiental 14:00 às 14:20 - A unidade curricular Políticas de Educação Ambiental no contexto da proposta interdisciplinar do Projeto Pedagógico do Curso de Bacharelado em Ciência Ambiental do Instituto de Geociências - Profa. Patricia Almeida

  12. NMR Imaging of Catalytic Hydrogenation in Microreactors with the Use of paraHydrogen

    Microsoft Academic Search

    Louis-S. Bouchard; Scott R. Burt; M. Sabieh Anwar; Kirill V. Kovtunov; Igor V. Koptyug; Alexander Pines

    2008-01-01

    Catalysis is vital to industrial chemistry, and the optimization of catalytic reactors attracts considerable resources. It has proven challenging to correlate the active regions in heterogeneous catalyst beds with morphology and to monitor multistep reactions within the bed. We demonstrate techniques, using magnetic resonance imaging and para-hydrogen (p-H2) polarization, that allow direct visualization of gas-phase flow and the density of

  13. Injection Molding Poly(Para-phenylene) with a Rapidly Heated Mold

    Microsoft Academic Search

    Thomas E. Kimerling; Donggang Yao; Byung H. Kim

    2009-01-01

    Poly(para-phenylene), a self-reinforced rigid-chain polymer, has superb mechanical properties. Its use as a thermoplastic polymer in injection molding, however, is prohibited because of its extremely high viscosity. In this study, an injection molding process with a rapidly heated mold was used to enhance the moldability. The mold can be heated from room temperature to 250C in 5s and thermally cycled

  14. Projeto do sistema anti-ressonante da fiao dos transdutores para o detector Mario Schenberg

    NASA Astrophysics Data System (ADS)

    Vieira, S. J.., Jr.; Melo, J. L.

    2003-08-01

    O detector de ondas gravitacionais Mario Schenberg est sendo projetado e construdo pelo grupo Grviton. Sua construo est ocorrendo no Laboratrio de Estado Slido e Baixas Temperaturas (LESBT) da Universidade de So Paulo, na cidade de So Paulo. Esse detector possui uma massa ressonante esfrica de cobre-alumnio, com 65 cm de dimetro, pesando aproximadamente 1150 Kg, suspensa por um sistema de isolamento vibracional, que se encontra em fase de testes preliminares. A real eficcia desse sistema, entretanto, s poder ser comprovada quando o detector estiver aparelhado com, pelo menos, um transdutor eletromecnico de altssima sensibilidade acoplado massa ressonante. Neste momento, no s este sistema de isolamento vibracional ser posto em teste, como o do projeto da fiao que transporta os sinais de microondas at os transdutores e destes para a pr-amplificao. Apesar dessa fiao ter sido projetada para no apresentar nenhum contato com a superfcie esfrica da antena, de maneira a no haver nenhuma transmisso de rudo vibracional do laboratrio para esta, deve-se minimizar o rudo microfnico produzido nessa fiao por oscilaes mecnicas, uma vez que ela no utiliza nenhum sistema de isolamento vibracional. Com o intuito de resolver este problema, projetamos uma estrutura, formada por pequenos cilindros conectados por barras, a qual no ter nenhuma ressonncia mecnica na faixa de freqncias de interesse para deteco (3000 - 3400 Hz). Desta forma, as vibraes nessa faixa no sero amplificadas. O projeto foi feito usando iterativamente, de maneira a otimizar os resultados obtidos, o programa de elementos finitos Msc/Nastran. Atravs de simulaes feitas neste programa, determinamos os parmetros geomtricos ideais a serem utilizados, os quais proporcionam a maior regio espectral de interesse livre de ressonncias.

  15. Modelos auxiliares para problemas de programacion lineal con coeficientes imprecisos en las restricciones

    Microsoft Academic Search

    L. Campos; J. L. Verdegay

    1989-01-01

    ResumenEn este artculo se considera un problema de Programacin Lineal en el que los coeficientes del sistema de inecuaciones lineales,\\u000a que definen el conjunto de restricciones, estn dados de forma imprecisa o vaga. Se supone entonces que tales coeficientes\\u000a pueden ser definidos mediante nmeros difusos. Se propone un enfoque de resolucin basado en las distintas versiones existentes\\u000a para la comparacin

  16. Un Marco No-Monotonico para Representar Intenciones Bajo un Modelo BDI

    E-print Network

    Guerra Hernández, Alejandro

    - vas, est´an ´intimamente relacionadas con las creencias y los planes, al tiempo que proveen elementos posibilidades l´ogicas leg´itimas. As´i, resulta ilustrativo notar que aunque el cambio de creencias sobre la,8,12,16], llevando a teor´ias de revisi´on de creencias y l´ogicas no-monot´onicas para creencias, los #12;2 procesos

  17. Calendrio escolar para o ano lectivo 2006/2007 1 SEMESTRE

    E-print Network

    Ribeiro,Isabel

    de Curso) Período de Aulas do 1º Ano: Segunda-feira, dia 25 de Setembro de 2006, a Sexta-feira, dia, a Quinta-feira, dia 14 de Setembro de 2006 ?poca Especial de Exames referente ao ano de 2006/2007 SegundaCalendário escolar para o ano lectivo 2006/2007 1º SEMESTRE Período de Aulas (excepto 1ºano

  18. SAGISc: Sistema Colaborativo para Recolha de Dados Paula Andr Pedro Antunes

    E-print Network

    Antunes, Pedro

    , etc. A segunda etapa processa-se no campo, onde se efectua o levantamento da geologia da área. Este deslocações ao local de estudo. ? de salientar que actualmente este processo pode demorar alguns anos. Este verificar as situações de dúvida ou para dar uma segunda opinião sobre determinado elemento geológico. O

  19. Lanzamiento del estudio de tratamiento personalizado para el cncer de seno

    Cancer.gov

    Hoy se inici el Estudio de Asignacin de Opciones Individualizadas de Tratamiento (Trial Assigning IndividuaLized Options for Treatment (Rx), o TAILORx, el cual evaluar si los genes que estn frecuentemente asociados con el riesgo de recurrencia entre las mujeres con cncer de seno en etapa inicial pueden ser utilizados para asignar a las pacientes el tratamiento ms adecuado y efectivo. Preguntas y respuestas

  20. Aplicando Metodos de Aprendizaje Sensible al Coste para Mejorar Problemas de Big Data

    E-print Network

    Granada, Universidad de

    ecnicas de mineria de datos no estan bien preparadas para afrontar los requerim- ientos de tiempo y espacio datos y las tecnologias de mineria de datos han quedado desbordados por no poder hacer frente a dichas,vlopez,j.m.benitez,herrera}@decsai.ugr.es Abstract. Debido a la explosion y proliferacion de datos en los ultimos a~nos, surge la necesidad de

  1. Propuesta de Diseo para la Gestin Colaborativa del Conocimiento Mediante Informacin Semntica

    Microsoft Academic Search

    Jaime Moreno Llorena; Xavier Alamn Roldn; Ruth Cobos Prez

    ABSTRACT Uno,de los ,efectos indeseables ,de la ,introduccin de las tecnologas de la informacin y las comunicaciones, Internet y la Web ha sido ,la sobrecarga ,de informacin. Se estn buscando soluciones,a este ,problema ,desde ,distintos campos ,de investigacin, Gestin del Conocimiento, Minera de Informacin, Web Semntica, etc. Una hiptesis interesante para buscar soluciones a este problema,en el mbito de los

  2. Solvatochromism and preferential solvation of para -derivatives of guaiacol in water-N,N-dimethylformamide mixtures

    Microsoft Academic Search

    D. S. Kosyakov; N. S. Gorbova; K. G. Bogolitsyn; L. V. Gusakov

    2007-01-01

    The influence of the composition of the water-N,N-dimethylformamide mixed solvent on the position of the B absorption band\\u000a in UV spectra of 2-methoxyphenol, its para-substituted derivatives, and corresponding phenolate anions simulating base units of natural lignin is investigated. The\\u000a data obtained are interpreted in terms of the model of preferential solvation. The preferential solvation parameters and compositions\\u000a of the solvation

  3. Exito para el XVI Festival Internacional de Teatro Hispano del Teatro Avante

    E-print Network

    Marrero, Marí a Teresa

    2002-04-01

    Nueva York del 20 al 30 de junio 2001 en el New 42nd Street Studios logr traer maravillosos representantes del teatro latinoamericano y espaol contemporneo. En Miami el programa incluy: Cenizas sobre el mar (Colombia/Miami), La ciudad sitiada...) y Melodrama (Brasil). Y hubo tres obras de teatrodanza: Jacinta-todas las plegarias (Ecuador/EEUU), Seque volvers (Colombia) y Materia (Brasil). Por ltimo el Teatro Taller de Colombia present Los cngaros, obra para espacios abiertos pblicos...

  4. ltima Hora Seminario Orientacin para Mayores de 25 Aos NOTICIAS Y EVENTOS

    E-print Network

    Escolano, Francisco

    Alumnos/as para las sesiones del 14 al 28 de marzo (Publicada 10/03/2014) Importante: El aula común de la Primer Apellido y Aula del Aulario II de 16 a 19 horas: Aula Desde Hasta C02 A L C03 M Z 19.30 - 21.00 : Los alumnos que deseen asistir a la clase sobre el manejo del Campus Virtual deberán acudir a las

  5. Mitotic Haploidization by Treatment of Aspergillus niger Diploids with para-Fluorophenylalanine

    Microsoft Academic Search

    Pol Lhoas

    1961-01-01

    IN genetic analysis based on mitotic segregation1-4 an important step is the recovery of haploid segregants from heterozygous diploids. This has been done until recently by laborious or complicated techniques4,5. I am indebted to Dr. G. Morpurgo, of the Istituto Superiore di Sanit, Rome, for informing me and permitting me to make use of his discovery that treatment with para-fluoro-phenylalanine

  6. Natural bond orbital (NBO) population analysis of para-substituted S-Nitroso-thiophenols

    Microsoft Academic Search

    Li Xiao-Hong; Tang Zheng-Xin; Zhang Xian-Zhou

    2009-01-01

    Theoretical study of several para-substituted S-Nitroso-thiophenols has been performed using quantum computational ab initio RHF and density functional B3LYP and B3PW91 methods with 6-31G(d,p) basis set. Geometries obtained from DFT calculations were used to perform NBO analysis. It is noted that the weakness in the SN sigma bond is due to nO1??S3N2? delocalisation and is responsible for the longer SN

  7. An Unusual Case of Bilateral Maxillary and Mandibular Para Premolar: A Case Report

    PubMed Central

    Chanagay, Sunil Kumar Vishwanath; Singh, Vikram; Bantwal, Sunil Rao; Muniyappa, Manjunatha

    2013-01-01

    The presence of supernumerary teeth is not uncommon in the general population. They occur more frequently in patients with a family history of such teeth. It is rare to find multiple supernumeraries in individuals with no other associated disease or syndrome. There have been very few documented cases of bilateral maxillary and mandibular supernumeraries in the premolar region. An unusual case of a 35-year-old man with six para premolars and complete dentition is presented. PMID:24396358

  8. ACADEMIA DE POLCIA CIVIL CONCURSO PBLICO PARA PROVIMENTO DE VAGAS E FORMAO DE CADASTRO DE RESERVA

    E-print Network

    Maier, Rudolf Richard

    ACADEMIA DE POLÍCIA CIVIL CONCURSO P?BLICO PARA PROVIMENTO DE VAGAS E FORMA??O DE CADASTRO DE ACADEMIA DE POLÍCIA CIVIL DO DISTRITO FEDERAL (APCDF), no uso de suas atribuições legais, torna pública inalterados os demais itens e subitens do referido edital. SANDRA GOMES MELO Diretora da Academia de Polícia

  9. Oficinas aprovadas OF1 Ensino de portugus como segunda lngua: uma abordagem bilngue para surdos

    E-print Network

    (HQ's): análise de livros didáticos de ensino de Espanhol/LE Carolina Parrini Ferreira e Camila no ensino de E/LE; ii) analisar o uso do gênero HQ em livros didáticos para o ensino de E/LE; iii) propor tem o potencial de dar vida ao livro didático, através da criação de personagens e contações. Propomos

  10. Contribuio dos fatores de risco psicossociais para o transtorno de dficit de ateno\\/hiperatividade

    Microsoft Academic Search

    Marcio M. Vasconcelos; Ana Flvia de A. Malheiros; Jairo Werner Jr.; Adriana R. Brito; Jane Bardawil Barbosa; talo S. Oliveira Santos; Daniel Fampa N. Lima

    2005-01-01

    RESUMO - Objetivo: Analisar a contribuio dos fatores psicossociais para a ocorrncia do transtorno de dficit de ateno\\/hiperatividade (TDAH).M t o d o:Este um estudo retrospectivo de casos-controles que analisou 403 alunos de uma escola pblica primria. Preencheram-se o questionrio de sintomas do DSM- IV e um questionrio psicossocial especfico e realizaram-se anamnese e exames fsico e neurolgico

  11. Stable self-trapping and ring formation in polydiacetylene para-toluene sulfonate

    NASA Astrophysics Data System (ADS)

    Wright, Ewan M.; Lawrence, Brian L.; Torruellas, William; Stegeman, George

    1995-12-01

    Numerical simulations of two-dimensional beam propagation in polydiacetylene para-toluene sulfonate measured values for n2>0 and n3<0 , where Delta n=n2I+n 3I2 , predict stable self-trapping and a new phenomenon in which a spatial ring evolves from a Gaussian input beam. We interpret the numerical results theoretically, using the variational model of nonlinear Gaussian beam propagation.

  12. RETROANLISE NEURAL PARA A IDENTIFICAO DOS PARMETROS ELSTICOS DA BARRAGEM CASCA DE FUNIL.

    E-print Network

    Coutinho, Alvaro L. G. A.

    1 RETROANÁLISE NEURAL PARA A IDENTIFICA??O DOS PAR?METROS ELÁSTICOS DA BARRAGEM CASCA DE FUNIL trabalho utiliza­se uma rede neural na identificação dos parâmetros elásticos dos materiais da casca e do maciço de fundação da barragem de Funil, a partir das medições efetuadas em cinco pontos instrumentados

  13. Reitor da Universidade de Lisboa reclama "medidas urgentes" para ensino superior

    E-print Network

    Instituto de Sistemas e Robotica

    Reitor da Universidade de Lisboa reclama "medidas urgentes" para ensino superior António Cruz Serra tomou posse como reitor da nova universidade que resulta da fusão da Clássica com a Técnica. Cruz Serra reitor da Universidade de Lisboa (UL), resultante da fusão entre a Clássica e a Técnica, falou nesta

  14. Design, synthesis and structure of novel para-quinones and their antibacterial activity.

    PubMed

    Pandurangan, Komala; Murnaghan, Kevin D; Walshe, Aurora; Mller-Bunz, Helge; Paradisi, Francesca; Morgan, Grace G

    2011-11-01

    Eight new para-quinones and one known analogue have been synthesized from p-chloranil. Five have been structurally characterized by single crystal diffraction, and a range of ligand folding is observed. All nine have been tested for their potency towards Gram(+) S.aureus and Gram(-) E.coli. Quinones 3, 6, 7 and 8 have shown activity towards S.aureus and quinones 3 and 8 also show good activity towards E.coli. PMID:21756289

  15. UM MODELO PARA RECOMENDAO DE ARTIGOS ACADMICOS BASEADO EM FILTRAGEM COLABORATIVA APLICADO AMBIENTES MVEIS

    Microsoft Academic Search

    Slvio Csar Cazella

    Resumo. Sistemas de Recomendao (SR) so hoje amplamente utilizados, principalmente na rea de e-commerce como, por exemplo, Amazon.com e Submarino.com. Neste trabalho, prope-se a utilizao destes sistemas na educao, especificamente para a recomendao de contedo em dispositivos mveis. A vantagem de se utilizar sistemas de recomendao em dispositivos mveis est na facilidade da entrega da recomendao aos usurios. Com base

  16. 4-Amino-12-methylsulfonyloxy-[2.2]paracyclophane

    PubMed Central

    Meng, Xiangchao; Duan, Wenzeng; Han, Yinfeng

    2014-01-01

    The title compound, C17H19NO3S, was synthesized from 4-benzhydrylideneamino-12-hydroxy-[2.2]paracyclophane and methanesulfonyl chloride. In the molecule, the distance between the centroids of two aromatic rings is 2.960?(5)?. In the crystal, weak NH?O and CH?O hydrogen bonds link the molecules into layers parallel to the ac plane. PMID:24526969

  17. Spontaneous rearrangement of para-sexiphenyl crystallites into nano-fibers

    Microsoft Academic Search

    C. Teichert; G. Hlawacek; A. Yu. Andreev; H. Sitter; P. Frank; A. Winkler; N. S. Sariciftci

    2006-01-01

    In the growth of para-sexiphenyl films on mica(001), an interesting phenomenon was observed where small individual crystallites\\u000a spontaneously arrange into parallel running high-aspect ratio chains with a length in the micrometer range. A statistical\\u000a analysis of the chain dimensions reveals a very narrow length distribution and the existence of a threshold length. The observation\\u000a of denuded zones around the chains

  18. El Grupo Actoral 80: Una alternativa para la integracin latinoamericana en el teatro

    E-print Network

    Herná ndez, Alex

    1988-04-01

    Adjunto y uno de sus idelogos principales) y reconocido oficialmente como grupo de teatro de la institucin. EL GA '80: EL ACTOR Y LA INTEGRACIN LATINOAMERICANA Pero el hecho de que actores de distintas nacionalidades latino americanas (boliviana... sesiones de reflexin terica (conducidas por Gene), decidi convertir la integracin latino americana en uno de los ejes orientadores para su actividad, en su alternativa frente al Teatro, en su ideologa. Not tambin que la reunin de distintas...

  19. Quantum chemical and experimental study of 1,2,4-trihydroxy-para-menthane

    NASA Astrophysics Data System (ADS)

    Rottmannov, Lenka; Luke, Vladimr; Il?in, Michal; Fodran, Peter; Herich, Peter; Koek, Jozef; Liptaj, Tibor; Klein, Erik

    2013-10-01

    The conformational analysis of the para-menthane (PM) and 1,2,4-trihydroxy-para-menthane (TPM) is performed using the quantum chemical density functional theory (DFT) and ab initio Mller-Plesset perturbation theory up to the second order (MP2). In TPM, three hydroxyl groups generate eight stereoisomers comparing to the four para-menthane stereoisomers. From the thermodynamics point of view, the most preferred conformations show the chair-shaped configuration of the cyclohexane ring. The obtained energy barriers for the isopropyl group rotation in the chair-shaped stereoisomers are between 35 and 45 kJ mol-1. The crystal structure as well as the solvated TPM stereoisomer isolated from the Tea tree oil, Melaleuca alternifolia (Maiden & Betche) Cheel, were investigated experimentally. Isolated stereoisomer corresponds to the most energetically preferred conformation and the calculated structural data agree very well with the results from the X-ray and nuclear magnetic resonance measurements. Finally, the influence of the conformation and the presence of the intramolecular hydrogen bonds on the homolytic Osbnd H bond dissociation enthalpies and proton affinities were also discussed with respect to the simple alcohols (methanol, iso-propanol, iso-pentanol, tert-butanol, cyclohexanol) and phenol.

  20. Atlas de aves: Un metodo para documentar distribucion y seguir poblaciones

    USGS Publications Warehouse

    Robbins, C.S.; Dowell, B.A.; Dawson, D.K.

    1988-01-01

    Los Atlas de Aves son proyectos nacionales o regionalies para trazar en mapas la distribucion en reproduccion de cada especie de ave. Ese procedimiento se esta usando en Europa, Australia, Nueva Zelanda, Norteamerica, y partes de Africa. El tama?o de los cuadrados varia de medio grado de latitud y Iongitud hasta 5 x 5 km. El trabajo de campo de cada proyecto exige aproxlmadamente cinco a?os, pero los aficionados pueden llevar a cabo la mayor parte del trabajo. Es posible almacenar los resultados en un computador personal. Hay muchos beneficios: (I) se presenta la distribucion corriente de las aves de la nacion, del estado, o de la Iocalidad; (2) se desarrolla nueva informacion especialmente sobre especies raras o en peligro; (3) se descubren areas que tienen una avlfauna sobresaliente o habitats raros y ayuda a su proteccion, (4) se documentan cambios de dlstribucion; (5) se pueden usar para documentar cambios de poblacion, especialmente en los tropicos donde otros metodos son mas dificiles de usar porque hay muchas especies y no hay muchos observadores calificados en la identificacion de sonidos de las aves; (6) son proyectos buenos de investigacion para estudiantes graduados; (7) los turistas y los jefes de excursiones de historia natural pueden contribuir con muchas informaciones