Moessbauer spectroscopy and X-ray diffraction studies of Fe-Ni order-disorder processes in a 35% Ni meteorite (Santa Catharina)

International Nuclear Information System (INIS)

Scorzelli, R.B.; Danon, J.

1985-01-01

The composition and structure of iron-nickel alloys in the Santa Catharina iron meteorite were investigated by metallographic techniques, electron microprobe analysis, Moessbauer spectroscopy and X-ray diffraction. The occurence of an ordered Fe-Ni phase with non-cubic symmetry is demonstrated. This phase is present in large proportions in the Santa Catharina meteorite, and has been identified by its asymmetric Moessbauer spectrum, arising from the presence of a quadrupolar splitting superposed on the magnetic hyperfine splitting. The other major Fe-Ni phase in Santa Catharina gives rise to a single line Moessbauer spectrum with no hyperfine components. X-ray diffraction confirms the presence of the Fe-Ni Llo superstructure in this meteorite. Lattice parameter variations with temperature were found to be identical for the meteorite and for electron irradiated Fe-Ni alloys of the sample composition. Detailed Moessbauer spectroscopy studies from room temperature to liquid helium, and in the presence of external magnetic field show the presence of a smaller amount of another ferromagnetic Fe-Ni phase, probably with disordered structure. The destruction of the superstructure in the Santa Catharina meteorite was investigated after heating the samples. Partial ordering seems to coexist with the disordered phase at intermediate annealing temperatures. At higher temperatures the samples are homogeneous and similar to laboratory produced Fe-Ni alloys with 35% Ni. Order-disorder transformations produced by shock waves and by mechanical treatment are also described. (orig.)

An integrated approach to investigate the hydrological behavior of the Santa Fe River Basin, north central Florida

Science.gov (United States)

Vibhava, F.; Graham, W. D.; De Rooij, R.; Maxwell, R. M.; Martin, J. B.; Cohen, M. J.

2011-12-01

The Santa Fe River Basin (SFRB) consists of three linked hydrologic units: the upper confined region (UCR), semi-confined transitional region (Cody Escarpment, CE) and lower unconfined region (LUR). Contrasting geological characteristics among these units affect streamflow generation processes. In the UCR, surface runoff and surficial stores dominate whereas in the LCR minimal surface runoff occurs and flow is dominated by groundwater sources and sinks. In the CE region the Santa Fe River (SFR) is captured entirely by a sinkhole into the Floridan aquifer, emerging as a first magnitude spring 6 km to the south. In light of these contrasting hydrological settings, developing a predictive, basin scale, physically-based hydrologic simulation model remains a research challenge. This ongoing study aims to assess the ability of a fully-coupled, physically-based three-dimensional hydrologic model (PARFLOW-CLM), to predict hydrologic conditions in the SFRB. The assessment will include testing the model's ability to adequately represent surface and subsurface flow sources, flow paths, and travel times within the basin as well as the surface-groundwater exchanges throughout the basin. In addition to simulating water fluxes, we also are collecting high resolution specific conductivity data at 10 locations throughout the river. Our objective is to exploit hypothesized strong end-member separation between riverine source water geochemistry to further refine the PARFLOW-CLM representation of riverine mixing and delivery dynamics.

Prevalencia de infeccion por HTLV-I/II en donantes de sangre de la provincia de Santa Fe, Argentina Prevalence of HTLV-I/II infection among blood donors in Santa Fe Province, Argentina

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Roque O. Brun

2004-04-01

Full Text Available Subsecuentemente a que en 1997 el Programa Nacional de SIDA implementó un Programa deVigilancia Epidemiológica a escala nacional, se comenzaron a detectar anticuerpos anti-HTLV-I/II en donantes de sangre de la Provincia de Santa Fe. En base a ese hallazgo inicial, se consideró pertinente estimar la seroprevalencia de HTLV-I/II en donantes santafecinos en el curso de los 4 años siguientes. Así, desde 1997 hasta 2002, se estudiaron 9425 muestras provenientes de 17 de los 19 departamentos de la Provincia. Del total de muestras, 38 resultaron reactivas por técnicas de tamizaje, y de ellas 18 fueron confirmadas por western blot (WB. De esas muestras, 10 fueron HTLV-I/II seropositivas con una prevalencia final de 0.1% (10/9425, en tanto que 7 resultaron indeterminadas y 1 negativa. De las seropositivas, 2 (0.02 % eran HTLV, 3 (0.03 % HTLV-I, y 5 (0.05 % HTLV-II. Cabe destacar que por primera vez se constató la presencia de infección por HTLV-I/II en donantes de sangre de Santa Fe, y con una prevalencia mayor a las referidas para donantes de sangre de áreas no endémicas de Argentina. Estos datos fundamentan la necesidad de un screening sistemático para la infección por HTLV-I/II mediante normas regulatorias en bancos de sangre de esta provincia.Subsequent to the National Epidemiologic Surveillance Program developed in 1997 by the National AIDS Program, anti-HTLV-I/II antibodies among blood donors in Santa Fe Province started to be detected. On the basis of this initial finding, it was regarded of interest to evaluate the true HTLV-I/II seroprevalence in this population during a four-year survey. Thus, from 1997 up to 2002, 9425 samples were studied from 17 out of the 19 provincial departments. Out of the total sampling, 38 proved reactive by agglutination techniques, 18 of which were confirmed by western blot (WB. Out of the latter, 10 were HTLV-I/II seropositive with a final prevalence of 0.1% (10/9425, whereas 7 were indeterminate and 1

Remediation of acid mine drainage from the Santa Fe tin mine, Bolivia

Science.gov (United States)

Calvo, Daniel; Zamora Echenique, Gerardo; Alfonso, Pura; Casado, Jordi; Trujillo, Elvys; Jiménez-Franco, Abigail; Garcia-Valles, Maite

2015-04-01

The Santa Fe mine, department of Oruro, is located in the Andean Tin belt, is exploited for tin, zinc, lead and silver. This in an underground mine mined up to the -108 level. Today it is only mined up to the -50 level. Under this level the table water covers the mine. Water reaches the surface with a very acidic composition, with a high content in potentially toxic elements. This water drains directly to the Santa Fe River and contribute to the pollution present in this river that directly affect to the aquatic communities. In addition, population of this area have problems in the supply of drinking water, so remediation by obtaining cleaning water is a priority for this area. This study presents a neutralization-precipitation treatment with lime to the acid water inside the mine. The ore mineralogy of the Santa Fe mined deposit consists mainly in cassiterite, pyrite, sphalerite, galena, arsenopyrite argentite and sulphosalts. The host mineral is mainly quartz, with a minor content in feldspars and tourmaline. Alteration minerals as alunite, goethite and pumbojarosite are abundant and indicate the occurrence of reactions that lead to the formation of acid mine drainage. The mean pH of water drained from the Santa Fe mine is 2.2 and chemical analyses show high contents in potentially toxic elements: 27-295 ppm Zn, 0.05-0.2 ppm Pb, 0.06-0.09 ppm Cd, 04-0.12 ppm Cu, 113-165 ppm Fe, 4 ppm Mn and 564-664 ppm S. As and Sb were under 0.5 ppm. A settler tank inside the mine was designed by means of seal a selected gallery to clean the mine water. The function of this gallery is to sediment the sludge resulting from the neutralization - precipitation treatment process to obtain a clear water overflow continuously to the outside. The neutralization tests indicate that 0.65g/L of lime and 2ml of flocculant should be added to neutralize water up to pH 6-7. A flow rate of 80 L /s was considered. After a geotechnical study, a chamber located in the mine was selected to locate

Historia de uso del suelo y contenido de micronutrientes en argiudoles del centro de la provincia de Santa Fe (Argentina History of soil use and micronutrient content in argiudolls of the center of the Santa Fe province (Argentina

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María Celeste Miretti

2012-07-01

Full Text Available Las investigaciones realizadas en la zona Central de la provincia de Santa Fe en relación con la concentración y biodisponibilidad de micronutrientes en los suelos son muy limitadas, por lo que los objetivos del presente trabajo fueron: a determinar si se produjo una disminución en los contenidos de micronutrientes en Argiudoles del centro de la provincia de Santa Fe como consecuencia del uso a que fueron destinados y b correlacionar la biodisponibilidad con propiedades del suelo que se conoce que fueron afectadas por la intensificación de los sistemas productivos (MO, pH. Se trabajó en el departamento Las Colonias (Santa Fe, en suelos Argiudoles. Se colectaron muestras compuestas de 20 lotes en condiciones prístinas (CP, 22 lotes con uso ganadero dedicados a la producción láctea (G, 24 lotes con historia agrícola-ganadera (AG y 20 lotes con prolongada historia agrícola (A, que se utilizaron para determinar: pH, carbono orgánico oxidable (CO, boro (B, cobre (Cu, hierro (Fe, manganeso (Mn y cinc (Zn. Los resultados indican que el pH no varió entre las situaciones estudiadas; los valores de CO disminuyeron (40% con la intensificación de la agricultura; la concentración de B y Zn se redujo en un 50% de la condición prístina a los lotes con larga historia agrícola; el Cu no sufrió alteraciones; Fe y Mn no muestran una tendencia clara de cambio en función del uso del suelo. En algunos casos podrían ocurrir deficiencias de Zn, por lo que debería controlarse rutinariamente su concentración, especialmente en los sistemas intensivos, para asegurar una disponibilidad adecuada a las necesidades de los cultivos. En todos los sistemas de uso analizados los tenores de micronutrientes presentaron elevada variabilidad.The studies related to the concentration and bioavailability of soil micronutrients are very limited for the central region of Santa Fe province, reason for which the objectives of the current research were: a to determine

Los Alamos National Laboratory Modular Pumped Hydro Feasibility Study for Santa Fe Community College

Energy Technology Data Exchange (ETDEWEB)

Bibeault, Mark Leonide [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

2015-04-21

Report on the Economic Energy Assessment for a community college in Santa Fe, New Mexico. Report shows graphically the demand for energy in the month of September, and illustrates the production of electricity as it goes onto the grid for use.

Discovery of South American suckermouth armored catfishes (Loricariidae, Pterygoplichthys spp.) in the Santa Fe River drainage, Suwannee River basin, USA

Science.gov (United States)

Nico, Leo G.; Butt, Peter L.; Johnston, Gerald R.; Jelks, Howard L.; Kail, Matthew; Walsh, Stephen J.

2012-01-01

We report on the occurrence of South American suckermouth armored catfishes (Loricariidae) in the Suwannee River basin, southeastern USA. Over the past few years (2009-2012), loricariid catfishes have been observed at various sites in the Santa Fe River drainage, a major tributary of the Suwannee in the state of Florida. Similar to other introduced populations of Pterygoplichthys, there is high likelihood of hybridization. To date, we have captured nine specimens (270-585 mm, standard length) in the Santa Fe River drainage. One specimen taken from Poe Spring best agrees with Pterygoplichthys gibbiceps (Kner, 1854) or may be a hybrid with either P. pardalis or P. disjunctivus. The other specimens were taken from several sites in the drainage and include seven that best agree with Pterygoplichthys disjunctivus (Weber, 1991); and one a possible P. disjunctivus x P. pardalis hybrid. We observed additional individuals, either these or similar appearing loricariids, in Hornsby and Poe springs and at various sites upstream and downstream of the long (> 4 km) subterranean portion of the Santa Fe River. These specimens represent the first confirmed records of Pterygoplichthys in the Suwannee River basin. The P. gibbiceps specimen represents the first documented record of an adult or near adult of this species in open waters of North America. Pterygoplichthys disjunctivus or its hybrids (perhaps hybrid swarms) are already abundant and widespread in other parts of peninsular Florida, but the Santa Fe River represents a northern extension of the catfish in the state. Pterygoplichthys are still relatively uncommon in the Santa Fe drainage and successful reproduction not yet documented. However, in May 2012 we captured five adult catfish (two mature or maturing males and three gravid females) from a single riverine swallet pool. One male was stationed at a nest burrow (no eggs present). To survive the occasional harsh Florida winters, these South American catfish apparently use

Core drilling provides information about Santa Fe Group aquifer system beneath Albuquerque's West Mesa

Science.gov (United States)

Allen, B.D.; Connell, S.D.; Hawley, J.W.; Stone, B.D.

1998-01-01

Core samples from the upper ???1500 ft of the Santa Fe Group in the Albuquerque West Mesa area provide a first-hand look at the sediments and at subsurface stratigraphic relationships in this important part of the basin-fill aquifer system. Two major hydrostratigraphic subunits consisting of a lower coarse-grained, sandy interval and an overlying fine-grained, interbedded silty sand and clay interval lie beneath the water table at the 98th St core hole. Borehole electrical conductivity measurements reproduce major textural changes observed in the recovered cores and support subsurface correlations of hydrostratigraphic units in the Santa Fe Group aquifer system based on geophysical logs. Comparison of electrical logs from the core hole and from nearby city wells reveals laterally consistent lithostratigraphic patterns over much of the metropolitan area west of the Rio Grande that may be used to delineate structural and related stratigraphic features that have a direct bearing on the availability of ground water.

Apache, Santa Fe energy units awarded two Myanmar blocks

International Nuclear Information System (INIS)

Anon.

1992-01-01

This paper reports that Myanmar's state oil company has awarded production sharing contracts (PSCs) on two blocks to units of Apache Corp. and Santa Fe Energy Resources Inc., both of Houston. That comes on the heels of a report by County NatWest Woodmac that notes Myanmar's oil production, currently meeting less than half the country's demand, is set to fall further this year. 150 line km of new seismic data could be acquired and one well drilled. During the initial 2 year exploration period on Block EP-3, Apache will conduct geological studies and conduct at least 200 line km of seismic data

Usando patrones de biodiversidad para la evaluación y diseño de áreas protegidas: las serpientes de la provincia de Santa Fe (Argentina como ejemplo Using biodiversity patterns for assessment and design protected areas: snakes of Santa Fe province (Argentina as example

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VANESA ARZAMENDIA

2004-06-01

Full Text Available Las serpientes son usualmente muy perseguidas por el hombre y poco consideradas en estrategias de conservación de la biodiversidad, siendo las áreas protegidas esenciales para su preservación. Se analizaron los patrones de riqueza y biogeográficos de las serpientes de Santa Fe, Argentina, para priorizar áreas para su conservación y evaluar si las reservas existentes coinciden con ellas. Los patrones de diversidad y distribución fueron establecidos mediante el análisis de 2.532 especímenes de ofidios de Santa Fe, obtenidos en muestreos de campo y revisión de colecciones, complementados con registros bibliográficos y un banco de datos regional de 8.000 ejemplares. Se determinaron las áreas de endemismos de serpientes, las que fueron comparadas con las divisiones fitogeográficas. Se dividió Santa Fe en 16 celdas de un grado de latitud y longitud, para comparar su riqueza, similitud y complementariedad, aplicándose un método para priorizar áreas de conservación según la riqueza y el valor de conservación de cada taxón. La riqueza de especies en Santa Fe aumenta con la disminución de la latitud y longitud en relación con un gradiente de aumento de temperatura y precipitaciones anuales promedio. En consecuencia las celdas ubicadas en el extremo nordeste poseen la mayor riqueza (conteniendo 84 % de las especies y las celdas ubicadas en el extremo suroeste la menor riqueza (20 %. Todas las celdas atravesadas por el río Paraná tienen una mayor riqueza que las celdas contiguas, probablemente, debido al efecto de este río como corredor de especies tropicales y subtropicales. Se definieron cinco áreas de endemismos, cuatro de ellas coinciden con una o dos divisiones fitogeográficas y son relevantes en análisis de conservación por tener especies exclusivas. El análisis de similitud entre celdas muestra tres grupos mayores, "noroeste", "noreste-centro" y "sur", que coinciden con tres áreas de endemismos. El análisis conjunto

High temperature annealing of fission tracks in fluorapatite, Santa Fe Springs oil field, Los Angeles Basin, California

Science.gov (United States)

Naeser, Nancy D.; Crowley, Kevin D.; McCulloh, Thane H.; Reaves, Chris M.; ,

1990-01-01

Annealing of fission tracks is a kinetic process dependent primarily on temperature and to a laser extent on time. Several kinetic models of apatite annealing have been proposed. The predictive capabilities of these models for long-term geologic annealing have been limited to qualitative or semiquantitative at best, because of uncertainties associated with (1) the extrapolation of laboratory observations to geologic conditions, (2) the thermal histories of field samples, and (3) to some extent, the effect of apatite composition on reported annealing temperatures. Thermal history in the Santa Fe Springs oil field, Los Angeles Basin, California, is constrained by an exceptionally well known burial history and present-day temperature gradient. Sediment burial histories are continuous and tightly constrained from about 9 Ma to present, with an important tie at 3.4 Ma. No surface erosion and virtually no uplift were recorded during or since deposition of these sediments, so the burial history is simple and uniquely defined. Temperature gradient (???40??C km-1) is well established from oil-field operations. Fission-track data from the Santa Fe Springs area should thus provide one critical field test of kinetic annealing models for apatite. Fission-track analysis has been performed on apatites from sandstones of Pliocene to Miocene age from a deep drill hole at Santa Fe Springs. Apatite composition, determined by electron microprobe, is fluorapatite [average composition (F1.78Cl0.01OH0.21)] with very low chlorine content [less than Durango apatite; sample means range from 0.0 to 0.04 Cl atoms, calculated on the basis of 26(O, F, Cl, OH)], suggesting that the apatite is not unusually resistant to annealing. Fission tracks are preserved in these apatites at exceptionally high present-day temperatures. Track loss is not complete until temperatures reach the extreme of 167-178??C (at 3795-4090 m depth). The temperature-time annealing relationships indicated by the new data

Interview with Joanna Bigfeather, Cherokee, Director of the Institute of American Indian Arts Museum (IAIA, Santa Fe, NM, USA, October 28, 2000 Entretien avec Joanna Bigfeather, Cherokee, directrice, Institute of American Indian Arts Museum (IAIA, Santa Fe, NM, États-Unis

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Gérard Selbach

2009-10-01

Full Text Available ForewordJoanna Bigfeather was appointed director of the Institute of American Indian Arts Museum, in Santa Fe, New Mexico, in April 1999. A Western Cherokee brought up in New Mexico, Joanna Osburn Bigfeather graduated from IAIA in 1987 and moved to the University of California at Santa Cruz to study for a Bachelor of Fine Arts. Then she attended the State University of New York in Albany, where she obtained a Master in Fine Arts. While exhibiting extensively prints, ceramics and installations...

CATÓLICOS EN LA PRENSA PROFANA. NUEVA ÉPOCA FRENTE AL REFORMISMO LIBERAL, SANTA FE, 1920-1923

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Diego A. Mauro

2008-01-01

Full Text Available El presente trabajo se sitúa en el contexto del proceso de reforma de la constitucional de la provincia de Santa Fe en torno al año 1921. Los proyectos reformistas de tendencia liberal y laicista condujeron a un enfrentamiento directo con la Iglesia Católica que recorrió transversalmente las identidades partidarias. Católicos y reformistas marcharon por las calles de Santa Fe e hicieron de la prensa uno de sus campos de batalla. En este artículo se analizará la estrategia seguida por publicistas y columnistas católicos en las intervenciones realizadas en el diario Nueva Época entre 1920 y 1923. Su participación en este medio les permitió conducir eficazmente disputas de sentido en la esfera pública y proyectar sus posiciones más allá de los circuitos propiamente católicos.

Genetics of leaf rust resistance in the hard red winter wheat cultivars Santa Fe and Duster

Science.gov (United States)

Leaf rust caused by Puccinia triticina is a common and important disease of hard red winter wheat in the Great Plains of the United States. The hard red winter wheat cultivars 'Santa Fe' and 'Duster' have had effective leaf rust resistance since their release in 2003 and 2006, respectively. Both cul...

Susan Magoffin’s Santa Fe Days in 1846: The Value of Testimony Les journées de Santa Fé en 1846 de Susan Magoffin : la valeur du témoignage

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Susanne Berthier-Foglar

2009-11-01

Full Text Available Susan Magoffin, la jeune épouse d’un commerçant de la piste de Santa Fe, accompagna son mari en 1846 pour un voyage où la caravane suivait de près l’Armée de l’Ouest et pendant lequel elle tint un journal. Cet article traite des 37 jours que dura la pause de la caravane à Santa Fe et aborde plus spécifiquement la façon dont l’auteur appréhendait l’altérité dans un environnement inhabituel et parfois dangereux. Pour apprécier la valeur du témoignage, je combine une analyse du discours avec une évaluation statistique du contenu. La description, parfois naïve, de Santa Fe sous l’occupation américaine illustre les raisons de la guerre contre le Mexique. En tant qu’agent de la destinée manifeste, Susan Magoffin admirait le général Kearny en lui attribuant des qualités surhumaines et en participant à ses efforts de propagande. Alors qu’elle était enracinée dans sa classe et sa culture, elle voyait la population mexicaine et les Amérindiens avec un esprit ouvert bien que ses motifs pour apprendre l’espagnol, ainsi que le métier de commerçante, avaient une fonction plus prosaïque.

Knowledge, attitudes and practices (KAP) regarding leptospirosis among residents of riverside settlements of Santa Fe, Argentina.

Science.gov (United States)

Ricardo, Tamara; Bergero, Laura C; Bulgarella, Esteban P; Previtali, M Andrea

2018-05-01

Leptospirosis is a global and re-emerging zoonotic disease caused by Leptospira spirochetes that are shed into the environment by infected animals. Humans can get infected via contact with animal hosts or contaminated environment. In Argentina, the highest annual incidences were reported in the province of Santa Fe, where epidemic outbreaks occurred during flooding events. This study examined the knowledge, attitudes and practices (KAP) regarding leptospirosis among residents of riverside slum settlements from Santa Fe after a major flood. A cross-sectional questionnaire was administered to 113 residents of 3 riverside settlements from Santa Fe. The influence of knowledge and attitudes regarding leptospirosis on the likelihood that an individual will use preventive practices were evaluated using linear mixed-effects models. The majority of respondents (83.2%) had previously heard about leptospirosis; however specific knowledge about leptospirosis was limited. The results of the modeling efforts, show that the likelihood of using preventive practices was associated with having greater knowledge score, but not with more positive attitudes. We also found that females were more likely to use safer practices than males. Even though the majority of respondents had heard about leptospirosis, a high percentage of them had limited knowledge regarding the severity of the disease and its prevalence in the region. Our results suggest that public health interventions in these riverside communities should focus on educating the public on the multiple dimensions of leptospirosis in order to attain greater adherence to preventive practices instead of intending to change the perceptions or attitudes towards the disease, which did not have a significant influence. The key challenge lies in identifying effective strategies to reach the high risk group for leptospirosis here that is male fishermen, who spend most of the time in precarious campsites on the river islands.

Social, cultural, and economic aspects of livestock ranching on the Santa Fe and Carson National Forests

Science.gov (United States)

Alice M. McSweeney; Carol Raish

2012-01-01

We examined the cultural, social, and economic aspects of livestock operations of ranchers who have Federal grazing permits (called permittees) on the Santa Fe and Carson National Forests of northern New Mexico. This study was an expansion of the 2003 pilot study and was designed to provide much-needed information concerning the culture and economic practices of the...

Cointegración y Simetrías en Precios. El Caso del Dulce de Leche en Santa Fe y Rosario

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E. D. Guiguet

2005-12-01

Full Text Available Este estudio tiene como objetivo evaluar la forma en que están cointegrados los precios minoristas de un producto típico argentino como es el dulce de leche, y el de su insumo básico, la leche cruda, en los mercados de Santa Fe y Rosario en el período 1996-2005, y la simetría en su ajuste de corto plazo. Se utiliza un análisis de cointegración no lineal con los modelos TAR y MTAR. Los resultados confirman la existencia de cointegración en ambas ciudades, y asimetría en los ajustes en el corto plazo en Santa Fe. Además que la transmisión de los cambios de precios es más rápida cuando los márgenes de comercialización disminuyen que cuando se incrementan.

Distribution of inorganic arsenic species in groundwater from Central-West Part of Santa Fe Province, Argentina

International Nuclear Information System (INIS)

Sigrist, Mirna; Albertengo, Antonela; Brusa, Lucila; Beldoménico, Horacio; Tudino, Mabel

2013-01-01

Highlights: • Study on inorganic arsenic species in groundwater for drinking in Santa Fe Argentina. • This information is currently scarce or absent in the region. • An analytical methodology based on SPE-FI-HGAAS coupling was used for speciation. • Information is given for a more accurate interpretation of the toxicological impact. - Abstract: The distribution of inorganic arsenic species in groundwater used as drinking water supply by the peri-urban and rural population from central-western area of Santa Fe Province, Argentina, was studied. An analytical methodology based on an online system of atomic absorption spectrometry with hydride generation and flow injection (FI-HGAAS) was used for total inorganic arsenic determination. For speciation purposes, the distinction between As(V) and As(III) was performed through the on line coupling of FI-HGAAS to a solid phase system based on an anionic exchanger able to retain As(V) as oxyanion, allowing As(III) to be selectively determined. The concentration of As(V) was calculated as the difference between total arsenic and As(III) concentrations. Effects of matrix interference due to the nonselective behavior of the exchange resins were carefully laid. Results for 59 samples collected from 27 localities showed an almost exclusive predominance of pentavalent forms

Liberalismo, democracia y catolicismo en Argentina. La reforma constitucional de 1921 y las identidades políticas. Santa Fe 1920-1923

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Diego A. Mauro

2008-11-01

Full Text Available El presente trabajo reconstruye el proceso de reforma de la Constitución de la Provincia de Santa Fe entre 1920 y 1923 y su impacto sobre el sistema político y la opinión pública. El grado de movilización social de los militantes católicos y liberales en las calles de Santa Fe y Rosario, así como la alta densidad de conflictos, acuerdos y rupturas entre los partidos y sus inestables facciones en el seno de la Constituyente hicieron de la coyuntura un potente matrizador de las identidades políticas. El artículo intenta paralelamente acercarse de manera aproximatoria a algunos de los modos en que la política filtró las identidades de los sectores populares y alimentó los imaginarios sociales críticos sobre la democracia liberal.

Investigation of the 234U/238U disequilibrium in the natural waters of the Santa Fe River basin north-central Florida

International Nuclear Information System (INIS)

Briel, L.I.

1976-01-01

Typical surface water masses in the Santa Fe basin are characterized by a 238 U concentration of 0.224 +- .014 ppB and a 234 U/ 238 U activity ratio of 1.081 +- .038. The Floridan aquifer in this area is represented by at least two distinct regimes of ground water. The effluent from the Poe Springs group has a nominal uranium concentration of 0.938 +- .014 ppB and an activity ratio of 0.900 +- .012, while the effluent from the Ichetucknee Springs group has a nominal uranium concentration of 0.558 +- .018 ppB and an activity ratio of 0.707 +- .022. The effluent from ten additional springs in the Santa Fe system can be represented by hypothetical mixtures of these two ground water regimes and a hypothetical surface water component, which may reflect the extent of local recharge to the aquifer in different parts of the basin

Mortality of Plutella xylostella (Lepidoptera, Plutellidae by parasitoids in the Province of Santa Fe, Argentina

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Isabel Bertolaccini

2011-09-01

Full Text Available Mortality of Plutella xylostella (Lepidoptera, Plutellidae by parasitoids in the Province of Santa Fe, Argentina. Plutella xylostella (Linnaeus, 1758 (Lepidoptera, Plutellidae larvae cause severe economic damage on cabbage, Brassica oleracea L. variety capitata (Brassicaceae, in the horticultural fields in the Province of Santa Fe, Argentina. Overuse of broad spectrum insecticides affects the action of natural enemies of this insect on cabbage. The objectives of this work were to identify the parasitoids of P. xylostella and to determine their influence on larva and pupa mortality. Weekly collections of larvae and pupae were randomly conducted in cabbage crops during spring 2006 and 2007. The immature forms collected were classified according to their developmental stage: L1 and L2 (Ls = small larvae, L3 (Lm = medium larvae, L4 (Ll = large larvae, pre-pupae and pupae (P. Each individual was observed daily in the laboratory until the adult pest or parasitoid emergence. We identified parasitoids, the number of instar and the percentage of mortality of P. xylostella for each species of parasitoid. Parasitoids recorded were: Diadegma insulare (Cresson, 1875 (Hymenoptera, Ichneumonidae, Oomyzus sokolowskii (Kurdjumov, 1912 (Hymenoptera, Eulophidae, Cotesia plutellae (Kurdjumov, 1912 (Hymenoptera, Braconidae and an unidentified species of Chalcididae (Hymenoptera. Besides parasitoids, an unidentified entomopathogenic fungus was also recorded in 2006 and 2007. In 2006, the most successful parasitoids were D. insulare and O. sokolowskii, while in 2007 only D. insulare exerted a satisfactory control and it attacked the early instars of the pest.

Estudio epidemiológico de los casos de triquinelosis registrados en la provincia de Santa Fe, Argentina, 1998-2009 Epidemiological study of recorded trichinosis cases in Santa Fe Province, Argentina, 1998-2009

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Gabriel J. Sequeira

2013-05-01

Full Text Available OBJETIVO: Caracterizar desde los puntos de vista epidemiológico, clínico y de laboratorio los casos y brotes de triquinelosis que se registraron en la provincia de Santa Fe, Argentina, entre 1998 y 2009. MÉTODOS: Se analizaron 1 519 fichas epidemiológicas de personas que presentaron síntomas y signos compatibles con triquinelosis en la provincia de Santa Fe en el período 1998-2009. Se realizó el análisis estadístico descriptivo de la información contenida en las fichas epidemiológicas y los resultados clínicos y de laboratorio; se aplicó el análisis bifactorial para determinar las posibles asociaciones con factores epidemiológicos y ambientales. RESULTADOS: Se encontraron síntomas de triquinelosis en 1 276 casos; 372 cumplían la definición de caso clínico y 224 muestras resultaron positivas por inmunofluorescencia indirecta, independientemente de su clasificación como caso clínico. Se identificaron 27 brotes que involucraron a 1 157 casos en ocho departamentos, con mayor frecuencia en el centro y el sur de la provincia. La distribución anual de los casos asociados epidemiológicamente entre sí fue heterogénea, con una mayor frecuencia en el período 2000-2003 y en los meses de agosto a octubre. Hubo mayor probabilidad de enfermar cuando se consumieron productos de fuentes informales (OR = 3,69; P = 0,014 y en las áreas rurales (OR = 1,799; P = 0,011. El período de incubación de la enfermedad (mediana fue de 12 días. Las personas que consumieron carne de cerdo o sus derivados tuvieron 2,06 veces más riesgo de enfermar que las que no la consumieron. CONCLUSIONES: El mayor número de brotes ocurrió en los departamentos más poblados y con mayor producción porcina. Se deben diseñar acciones específicas de prevención y control de la enfermedad en esos departamentos. Se debe considerar el análisis epidemiológico de riesgos al evaluar, gestionar y comunicar los riesgos sanitarios de triquinelosis.OBJECTIVE: To

EVALUACIÓN DE Salvia hispanica L. CULTIVADA EN EL SUR DE SANTA FE (REPÚBLICA ARGENTINA)

OpenAIRE

Héctor Busilacchi; Mirta Quiroga; Mirian Bueno; Osvaldo Di Sapio; Voykos Flores; Cecilia Severin

2013-01-01

Salvia hispanica L. (chía)-Lamiaceae, es una especie de interés dietario-medicinal, fuente de ácidos grasos Omega-6 y Omega-3, proteínas, antioxidantes y fibras solubles e insolubles. No existen suficientes datos disponibles sobre las posibilidades de llevar el cultivo a término en el sur de la provincia de Santa Fe, considerando principalmente la incidencia de heladas tardías. Ante la escasez de información sobre el cultivo a campo de S. hispanica en diferentes regiones de Argentina, teni...

Espanola/Canjilon Pilot Study: Economic, social, and cultural aspects of public land grazing on the Santa Fe and Carson National Forests

Science.gov (United States)

Carol Raish

1999-01-01

Many of the livestock grazing permittees on the Carson and Santa Fe National Forests in northern New Mexico are descendants of Hispanic settlers who have farmed and ranched in the region for 400 years. Much of the permitted land was formerly owned or used by local communities under Spanish and Mexican land grants. Cultural differences and historical issues of...

The Great Southwest of the Fred Harvey Company and the Santa Fe Railway, edited by Marta Weigle and Barbara A. Babcock. The Heard Museum, Pheonix (printed by The University of Arizona Press, Tucson, for The Heard Museum, 1996

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Douglas R. Givens

1997-11-01

Full Text Available One of the more colorful eras in American Southwestern archaelogy is reflected in The Great Southwest of the Fred Harvey Company and the Santa Fe Railway. Marta Weigle and Barbara A. Babcock, editors of the volume, have done a superb job weaving in early Southwestern archaeological activities with the role of the Fred Harvey Company and the Santa Fe Railway in bring the American Southwest to those "east of the Mississippi River". Many early Southwestern archaeologists made their way throughout the Southwest on the Santa Fe Railway while the "outposts of civilization" that the Fred Harvey Company provided in many railroad stations served as a " bit of home" to the traveler. This book describes the collaboration of both Fred Harvey and the Santa Fe Railroad tourism in the American Southwest and provides an excellent look into the Native American artists and their comumnities which were transformed on a massive scale by the Fred Harvey Company as it bought, sold, and popularized Native American art. Also part of the volume is an excellent discussion of the network of major museums that hold art collections which were purchased through the Harvey Company's Indian Department.

Guerra, imperio y violencia en la Audiencia de Santa Fe, Nuevo Reino de Granada, 1580-1620

OpenAIRE

Córdoba Ochoa, Luis Miguel

2013-01-01

Programa de Doctorado en Estudios sobre Europa, el Mundo Mediterráneo y su Difusión Atlántica: Élites y Procesos de Convergencia Cultural y Económica, 1450-1900 En la tesis se analizan los procesos mediante los cuales los españoles adquirieron, construyeron y reinterpretaron los conocimientos sobre la población indígena y sobre los recursos de los territorios bajo la jurisdicción de la Audiencia de Santa Fe -hoy Bogotá-, en el Nuevo Reino de Granada durante el siglo XVI, con el propósito d...

Olga Cossettini in the labyrinth of the political sociability of Santa Fe (Argentina, 1937-1943

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Sandra Rita Fernandez

2015-01-01

Full Text Available This article's intent is to take into account the web of acquaintanceships that teacher and pedagogue V. Olga Cossettini developed during the 1930's and early 1940's, thanks to which she was able to organize her educational project in the official educational structures of Santa Fe province of Argentina. In a historical context marked by intervention and fraud, we intend to historically locate this educator, allowing the integral comprehension of said historical context's complexities; and also allowing the interpretation of what an experience such as Escuela Serena meant in a political climate that, a priori, one would have thought of as less than ideal for this type of pedagogical practices.

Channel bed particle size distribution procedure used to evaluate watershed cumulative effects for range permit re-issuance on the Santa Fe National Forest

Science.gov (United States)

Bruce Sims; Jim Piatt; Lee Johnson; Carol Purchase; John Phillips

1996-01-01

Personnel on the Santa Fe National Forest used methodologies adapted from Bevenger and King (1995) to collect base line particle size data on streams within grazing allotments currently scheduled for permit reissuance. This information was used to determine the relative current health of the watersheds as well as being used in the development of potential alternatives...

Propiedades fisicoquímicas en suelos predominantes del noroeste de Santa Fe y sur de Santiago del Estero, Argentina Physicochemical properties of predominant soils in Northwestern Santa Fe and Southern Santiago del Espero provinces, Argentina

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Germán Roberto Revelli

2010-12-01

Full Text Available Un total de 175 muestras de suelos fueron recolectadas en la zona noroeste de Santa Fe y sur de Santiago del Estero durante el período 2001-2009. Se realizaron análisis fisicoquímicos (pH, Nitrógeno Total, Nitrógeno Nítrico, Nitrato, Fósforo, Potasio, Azufre y Materia Orgánica con el objetivo de categorizar las mismas en función a su calidad y aptitud para uso agrícola-ganadero. El perfil de los suelos analizados destaca deficiencias en Nitrógeno (NT = 0,127 ± 0,032%, N-NO3-= 13 ± 10,349 mg kg-1 y NO3- = 56 ± 45,830 mg kg-1 y un potencial de hidrógeno levemente ácido (pH = 6,4 ± 0,623, observándose una marcada tendencia a aumentar la acidificación en los últimos años. La fertilización equilibrada adquiere importancia estratégica a la hora de obtener óptimos rendimientos en los suelos de la zona, y la incorporación de prácticas de manejo conservadoras tales como labranza reducida, aumento de materia orgánica y rotación de cultivos son fundamentales para el desarrollo sostenible de la región.In recent years, there has been an increasing interest in evaluating soil quality and health. The resource soil is a fundamental component of the biosphere, participating in the production of food, fibers and energy and consequently impacting on the environmental quality. The indiscriminate expansion of agriculture added to the inadequate management in many areas has led to the deterioration of soil structure and to the consequent reduction in organic matter levels, affecting the soil chemical and physical fertility. A total of 175 soil samples were collected in the northwestern area of Santa Fe and in the southern part of Santiago del Estero provinces during the 2001-2009 period. Physicochemical analyses were carried out (pH, Total Nitrogen, Nitrate- Nitrogen, Nitrate, Phosphorus, Potassium, Sulfur and Organic Matter with the objective of categorizing the soil samples according to fertility and aptitude for agricultural-cattle use

You're a "What"? Santa Claus

Science.gov (United States)

Royster, Sara

2013-01-01

Professional Santas entertain children and adults during the holiday season at all types of events. They work at shopping malls or stores; entertain crowds at parades and tree lightings; and make appearances at holiday parties, charity events, and people's homes. Most Santas work during the Christmas holiday season, which usually lasts from late…

Biologic origin of iron nodules in a marine terrace chronosequence, Santa Cruz, California

Science.gov (United States)

Schulz, M.S.; Vivit, D.; Schulz, C.; Fitzpatrick, J.; White, A.

2010-01-01

The distribution, chemistry, and morphology of Fe nodules were studied in a marine terrace soil chronosequence northwest of Santa Cruz, California. The Fe nodules are found at depths hyphae throughout the nodules, including organic structures incorporating fine-grained Fe oxides. The fine-grained nature of the Fe oxides was substantiated by M??ssbauer spectroscopy. Our microscopic observations led to the hypothesis that the nodules in the Santa Cruz terrace soils are precipitated by fungi, perhaps as a strategy to sequester primary mineral grains for nutrient extraction. The fungal structures are fixed by the seasonal wetting and dry cycles and rounded through bioturbation. The organic structures are compacted by the degradation of fungal C with time. ?? Soil Science Society of America. All rights reserved.

Photocatalytic activity of Fe-doped CaTiO₃ under UV-visible light.

Science.gov (United States)

Yang, He; Han, Chong; Xue, Xiangxin

2014-07-01

The photocatalytic degradation of methylene blue (MB) over Fe-doped CaTiO₃ under UV-visible light was investigated. The as-prepared samples were characterized using X-ray diffraction (XRD), scanning electron microscope (SEM) equipped with an energy dispersive spectrometer (EDS) system, Fourier transform infrared spectra (FT-IR), and UV-visible diffuse reflectance spectroscopy (DRS). The results show that the doping with Fe significantly promoted the light absorption ability of CaTiO₃ in the visible light region. The Fe-doped CaTiO₃ exhibited higher photocatalytic activity than CaTiO₃ for the degradation of MB. However, the photocatalytic activity of the Fe-doped CaTiO₃ was greatly influenced by the calcination temperature during the preparation process. The Fe-doped CaTiO₃ prepared at 500°C exhibited the best photocatalytic activity, with degradation of almost 100% MB (10ppm) under UV-visible light for 180 min. Copyright © 2014. Published by Elsevier B.V.

Earthquake scenario and probabilistic ground-shaking hazard maps for the Albuquerque-Belen-Santa Fe, New Mexico, corridor

Science.gov (United States)

Wong, I.; Olig, S.; Dober, M.; Silva, W.; Wright, D.; Thomas, P.; Gregor, N.; Sanford, A.; Lin, K.-W.; Love, D.

2004-01-01

New Mexico's population is concentrated along the corridor that extends from Belen in the south to Española in the north and includes Albuquerque and Santa Fe. The Rio Grande rift, which encompasses the corridor, is a major tectonically, volcanically, and seismically active continental rift in the western U.S. Although only one large earthquake (moment magnitude (M) ≥ 6) has possibly occurred in the New Mexico portion of the rift since 1849, paleoseismic data indicate that prehistoric surface-faulting earthquakes of M 6.5 and greater have occurred on aver- age every 400 yrs on many faults throughout the Rio Grande rift.

Frecuencia de parásitos intestinales en pacientes VIH+ en la ciudad de Santa Fe de Bogotá

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Myriam Consuelo López

1999-01-01

Full Text Available The objective ofthe present work is to find frequency of intestinasl opportunistic parasites in a population of HIV + outpatients that assisted to the program of Sexual Transmited Diseases (STD in University Hospital San Juan de Dios at Santa Fe de Bogotá. Cryptosporidum sp. and lsospora belli were observed in 1% of patients. It is important to emphasize the low frequency of opportunistic parasites in this study. The highest prevelence corresponded to Endolimax-nana (15.1 % and Entamoeba coli  (13.2%. The frequency of nematodes is very low: unicinaria and Strongyloides stercoralis were presentn 1%.

Copper Tube Pitting in Santa Fe Municipal Water Caused by Microbial Induced Corrosion.

Science.gov (United States)

Burleigh, Thomas D; Gierke, Casey G; Fredj, Narjes; Boston, Penelope J

2014-06-05

Many copper water lines for municipal drinking water in Santa Fe, New Mexico USA, have developed pinhole leaks. The pitting matches the description of Type I pitting of copper, which has historically been attributed to water chemistry and to contaminants on the copper tubing surface. However, more recent studies attribute copper pitting to microbial induced corrosion (MIC). In order to test for microbes, the copper tubing was fixed in hexamethyldisilazane (HMDS), then the tops of the corrosion mounds were broken open, and the interior of the corrosion pits were examined with scanning electron microscopy (SEM). The analysis found that microbes resembling actinobacteria were deep inside the pits and wedged between the crystallographic planes of the corroded copper grains. The presence of actinobacteria confirms the possibility that the cause of this pitting corrosion was MIC. This observation provides better understanding and new methods for preventing the pitting of copper tubing in municipal water.

Copper Tube Pitting in Santa Fe Municipal Water Caused by Microbial Induced Corrosion

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Thomas D. Burleigh

2014-06-01

Full Text Available Many copper water lines for municipal drinking water in Santa Fe, New Mexico USA, have developed pinhole leaks. The pitting matches the description of Type I pitting of copper, which has historically been attributed to water chemistry and to contaminants on the copper tubing surface. However, more recent studies attribute copper pitting to microbial induced corrosion (MIC. In order to test for microbes, the copper tubing was fixed in hexamethyldisilazane (HMDS, then the tops of the corrosion mounds were broken open, and the interior of the corrosion pits were examined with scanning electron microscopy (SEM. The analysis found that microbes resembling actinobacteria were deep inside the pits and wedged between the crystallographic planes of the corroded copper grains. The presence of actinobacteria confirms the possibility that the cause of this pitting corrosion was MIC. This observation provides better understanding and new methods for preventing the pitting of copper tubing in municipal water.

Imágenes especulares: Educación, laicidad y catolicismo en Santa Fe, 1900-1940

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Diego A. Mauro

2009-01-01

Full Text Available El presente trabajo se interroga en torno a las relaciones entre catolicismo y laicismo en el terreno educativo. Se pregunta, en particular, sobre la consistencia historiográfica de las imágenes construidas como reflejo de la tesis del "renacimiento católico". Según estos cuadros, la contracara del denominado "renacimiento" habría sido el ocaso de una "Argentina laica y liberal", consagrada en términos educativos en la ley 1420. Partiendo de estas visiones especulares, el texto se propone discutir, para el caso de la provincia de Santa Fe, algunos de los argumentos esgrimidos tras la "postal laicista", a la luz de los debates abiertos en torno a las teorías de la "secularización" y de la "modernidad".

Santa Cruz thermic plant islanding with local loads

Energy Technology Data Exchange (ETDEWEB)

Nascimento, A R [Light Servicos de Eletricidade SA, Rio de Janeiro, RJ (Brazil); Gomes, Paulo; Almeida, Paulo C. de [ELETROBRAS, Rio de Janeiro, RJ (Brazil); Sereno, Marcos G [FURNAS, Rio de Janeiro, RJ (Brazil)

1988-12-31

This work looks into the feasibility of implementing a scheme for the islanding of the Santa Cruz Thermic Plant ( Rio de janeiro State) with LIGHT`s (Electric power public utility) loads fed by the Santa Cruz-Jacarepagua trunk connection, considering presently-existing system problems relative to a significant frequency drop when a loss occurs of a large generation block and which causes the blockade scheme of the mentioned Plant to work, thus aggravating the frequency control still further. An analysis is made of such scheme implementation implications on the scheme for islanding a Santa Cruz 84 MW machine to provide supply to the auxiliary services of The Angra dos Reis nuclear plant presently existing in the system. 2 refs., 9 figs.

Vigilancia de la resistencia de Neisseria gonorrhoeae en un hospital de la provincia de Santa Fe, Argentina: 1997-2004 Resistance surveillance of Neisseria gonorrhoeae in a hospital in Santa Fe province, Argentina: 1997-2004

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E. De Los A. Méndez

2008-09-01

Full Text Available Se determinaron los fenotipos de resistencia caracterizados por la concentración inhibitoria mínima, la difusión con discos y la producción de β-lactamasa de 434 aislamientos de Neisseria gonorrhoeae obtenidos de pacientes atendidos en el Servicio de Enfermedades de Transmisión Sexual del Hospital Dr. José María Cullen, Santa Fe, Argentina. Se realizaron pruebas de sensibilidad a los siguientes antimicrobianos: penicilina, tetraciclina, ciprofloxacina, espectinomicina, azitromicina y ceftriaxona. A tres aislamientos resistentes a ciprofloxacina se les realizó electroforesis de campo pulsado. Se destacaron tres situaciones epidemiológicas de interés: en el año 1997, alta incidencia de aislamientos con resistencia plasmídica a tetraciclina (33,3%; en el período 2002-2004, un aumento significativo de la resistencia plasmídica a penicilina (9,7% a 34,8%; y en el año 2000, la emergencia de dos de los tres primeros aislamientos con resistencia a quinolonas del país. El primer aislamiento resistente a azitromicina en nuestro hospital emerge en el 2004. Este trabajo jerarquiza el rol del Laboratorio de Microbiología Clínica en la orientación del tratamiento empírico de la gonorrea.Resistance phenotypes characterized by minimum inhibitory concentration, disk diffusion and β-lactamase production were determined in 434 isolates from patients attending the Sexually Transmitted Disease Service at Dr. José María Cullen Hospital in Santa Fe, Argentina. Susceptibility tests to penicillin, tetracycline, ciprofloxacin, espectinomycin, azithromycin and ceftriaxone were performed. Pulsed-field gel electrophoresis was conducted made to on three ciprofloxacin-resistant isolates. Epidemiologically speaking, three interesting events should be highlighted: during 1997, plasmid-mediated high level tetracycline-resistant strains were observed (33.3%; from 2002 to 2004 a significant increase of plasmid-mediated penicillin-resistant strains was

Quantum yield measurements of light-induced H₂ generation in a photosystem I-[FeFe]-H₂ase nanoconstruct.

Science.gov (United States)

Applegate, Amanda M; Lubner, Carolyn E; Knörzer, Philipp; Happe, Thomas; Golbeck, John H

2016-01-01

The quantum yield for light-induced H2 generation was measured for a previously optimized bio-hybrid cytochrome c 6-crosslinked PSI(C13G)-1,8-octanedithiol-[FeFe]-H2ase(C97G) (PSI-H2ase) nanoconstruct. The theoretical quantum yield for the PSI-H2ase nanoconstruct is 0.50 molecules of H2 per photon absorbed, which equates to a requirement of two photons per H2 generated. Illumination of the PSI-H2ase nanoconstruct with visible light between 400 and 700 nm resulted in an average quantum yield of 0.10-0.15 molecules of H2 per photon absorbed, which equates to a requirement of 6.7-10 photons per H2 generated. A possible reason for the difference between the theoretical and experimental quantum yield is the occurrence of non-productive PSI(C13G)-1,8-octanedithiol-PSIC13G (PSI-PSI) conjugates, which would absorb light without generating H2. Assuming the thiol-Fe coupling is equally efficient at producing PSI-PSI conjugates as well as in producing PSI-H2ase nanoconstructs, the theoretical quantum yield would decrease to 0.167 molecules of H2 per photon absorbed, which equates to 6 photons per H2 generated. This value is close to the range of measured values in the current study. A strategy that purifies the PSI-H2ase nanoconstructs from the unproductive PSI-PSI conjugates or that incorporates different chemistries on the PSI and [FeFe]-H2ase enzyme sites could potentially allow the PSI-H2ase nanoconstruct to approach the expected theoretical quantum yield for light-induced H2 generation.

Ethnoastronomy in the Multicultural Context of the Agricultural Colonies in Northern Santa Fe Province, Argentina

Science.gov (United States)

Mudrik, Armando

In this paper, we present a study about cultural astronomy among European colonists and their Argentinean descendants, in the context of a complex interaction between criollos, aboriginals and European colonists from different origins and religions, who settled in the northern area of the Argentinean province of Santa Fe, which is part of the southern Gran Chaco. These colonists arrived among waves of immigration occurring in Argentina in the second half of the nineteenth century and the first half of the twentieth century. Through ethnographic field research among these immigrants and their descendants, we carried out a survey of their astronomical representations and practices, and the connections of these with their social life and farming tasks. Through this we gained an insight as to how the astronomical ideas of immigrants, criollos and aboriginal groups influenced each other, generating a variety of new relations with the celestial realm.

Economic, social, and cultural aspects of livestock ranching on the Española and Canjilon Ranger Districts of the Santa Fe and Carson National Forests: a pilot study

Science.gov (United States)

Carol Raish; Alice M. McSweeney

2003-01-01

The ranches of northern New Mexico, composed of land and livestock, are integral components of family and community life. This pilot study examines current economic, social, and cultural aspects of livestock operations owned by ranchers with Federal grazing permits (permittees) on the Canjilon and Española Ranger Districts of the Santa Fe and Carson National...

Edilicia pública en el Archivo Municipal de Santa Fe: El arquitecto Francisco Fábregas Vehil (1925-1934

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Ana María Castañeda Becerra

2009-12-01

Full Text Available Santa Fe inicia la remodelación de su edilicia pública durante la Dictadura de Primo de Rivera a raíz de tres decisiones municipales: construir un local apropiado para las Escuelas, un nuevo Ayuntamiento, y modernizar la imagen de la ciudad ante la celebración de la Exposición Iberoamericana de Sevilla en 1929. El proyecto (Casa Consistorial, Mercado con Matadero, Escuelas, Pavimentación y Alcantarillado, y dos Lavaderos se encarga a la empresa “Técnica de Construcción, S.A” y a su arquitecto Francisco Fábregas Vehil, quien realizó los proyectos y dirigió las obras desde Sevilla y Barcelona hasta bien entrada la Segunda República.

Repressive frames: continuities and discontinuities in a case study. The Dirección General de Informaciones, province of Santa Fe, 1966-1991"

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Gabriela Águila

2013-04-01

Full Text Available The article analyzes an intelligence agency acting provincial level (province of Santa Fe, which was not part of the police or military orbit and worked steadily between 1966 and the early 90s. It discusses its objectives and functions, rules, structure and agents, their actions and practices, recording the continuities and changes experienced over its decades of existence. It aims to contribute to a study of a particular case the knowledge of one of the gray areas, perhaps the most opaque, the exercise of repression in Argentina: the performance of the intelligence services.

A case of familial transmission of community-acquired methicillin-resistant Staphylococcus aureus carrying the lnu(A gene in Santa Fe city, Argentina Caso de transmisión familiar de Staphylococcus aureus resistente a la meticilina adquirido en la comunidad portador del gen lnu(A en la ciudad de Santa Fe, Argentina

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Emilce de los A Méndez

2012-12-01

Full Text Available Community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA is increasingly recognized as an important pathogen causing skin and soft tissue infections as well as necrotizing pneumonia. We describe a case of familial transmission of CA-MRSA between a 6-month-old boy and his mother in Santa Fe City, Argentina. Both isolates showed an identical antimicrobial susceptibility profile, carried type IV SCCmec and harboured the pvl and the lnu(A genes. Isolates showed indistinguishable SmaI-PFGE patterns confirming their genetic relationship. These results corroborate the intrafamilial transmission of CA-MRSA and might associate this strain with the repetitive events of furunculosis within the family.Staphylococcus aureus resistente a la meticilina adquirido en la comunidad (SARM-AC es reconocido como un patógeno importante que causa infecciones de piel y partes blandas y neumonía necrotizante. Describimos un caso de transmisión familiar de SARM-AC entre un nino de 6 meses de edad y su madre en la ciudad de Santa Fe, Argentina. Ambos aislamientos mostraron idéntico perfil de sensibilidad a los antimicrobianos, tenían el SCCmec tipo IV, y contenían los genes pvl y lnu(A. Los aislamientos presentaron patrones de SmaI-PFGE indistinguibles entre sí, lo cual confirmó su relación genética. Estos resultados corroboran la transmisión intrafamiliar de SARM-AC; asimismo, este aislamiento podría asociarse con los eventos repetitivos de furunculosis en la familia.

Inseguridad alimentaria en la ciudad de Santa Fe: percepción de los ciudadanos

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María Amalia Rosso

2015-01-01

Full Text Available El objetivo de este estudio fue describir el nivel de seguridad alimentaria percibida en los hogares de la ciudad de Santa Fe, Argenttina, en el año 2011. Se realizó un estudio descriptivo, de corte transversal, incluyendo 592 hogares que integran el Panel de Hogares del Observatorio Social de la Universidad Nacional del Litoral. Los hogares se caracterizaron sociodemográficamente, se los clasificó según el nivel de seguridad alimentaria, aplicando la Escala Latinoamericana y Caribeña de Seguridad Alimentaria y se determinó su asociación, mediante odds ratio y regresión logística, con factores sociodemográficos. Se halló que el 31,5% de los hogares santafesinos presenta inseguridad alimentaria, de los cuales el 21,7% es leve, el 7,4% moderada y el 2,4% severa, incrementándose cuando conviven menores. La inseguridad alimentaria se asoció positivamente con no poseer cobertura de salud, actividad económica, capacidad de ahorro ni el secundario completo y con la existencia de cuatro o más integrantes en el hogar.

Finance and faith at the Catholic Maternity Institute, Santa Fe, New Mexico, 1944-1969.

Science.gov (United States)

Cockerham, Anne Z; Keeling, Arlene W

2010-01-01

In 1944, the Medical Mission Sisters opened the Catholic Maternity Institute in Santa Fe, New Mexico, primarily to serve patients of Spanish American descent. The Maternity Institute offered nurse-midwifery care and functioned as a school to train nurse-midwifery students. Originally planned as a home birth service, the Catholic Maternity Institute soon evolved into a service in which patients chose whether to deliver in their own homes or in a small freestanding building called La Casita. In fact, despite their idealism about home birth and strong feelings that home birth was best, the sisters experienced significant ambivalence concerning La Casita. Births there met many of the institute's pragmatic needs for a larger number of student experiences, quick and safe transfers to a nearby hospital, and more efficient use of the midwives' time. Importantly, as the sisters realized that many of their patients preferred to deliver at La Casita, they came to see that this option permitted these impoverished patients an opportunity to exercise some choice. However, the choice of many patients to deliver at La Casita--which was significantly more expensive for the Maternity Institute than home birth--eventually led to the demise of the Maternity Institute.

Photoelectrocatalytic activity of liquid phase deposited α-Fe2O3 films under visible light illumination

International Nuclear Information System (INIS)

Zhang, Man; Pu, Wenhong; Pan, Shichang; Okoth, Otieno Kevin; Yang, Changzhu; Zhang, Jingdong

2015-01-01

Liquid phase deposition (LPD) technique was employed to prepare α-Fe 2 O 3 films for photoelectrocatalytic degradation of pollutants. The obtained LPD films were characterized by various surface analysis techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and X-ray photoelectron spectroscopy (XPS). The results indicated that α-Fe 2 O 3 films with porous structure were successfully deposited on the titanium substrates by the LPD process. The UV–Visible diffuse reflectance spectroscopic (DRS) analysis showed that the obtained LPD α-Fe 2 O 3 film mainly absorbed visible light, which was advantageous to the utilization of solar energy. Under visible light illumination, the Fe 2 O 3 film electrodes exhibited sensitive photocurrent responses, which were affected by the calcination temperature. Consistent with the photocurrent analysis, the α-Fe 2 O 3 film calcined at 600 °C showed the best photoelectrocatalytic performance, and different organic pollutants such as methyl orange (MO) and p-nitrophenol (PNP) were effectively degraded over the LPD film electrode by photoelectrocatalytic treatment under visible light illumination. - Highlights: • α-Fe 2 O 3 film is prepared by liquid phase deposition process. • LPD α-Fe 2 O 3 film has a porous structure and absorbs visible light. • Calcination temperature shows a significant effect on the PEC performance of α-Fe 2 O 3 film. • α-Fe 2 O 3 film is efficient for photoelectrocatalytic degradation of pollutants

Accreditation of the mammography's services in the city of Santa Fe

International Nuclear Information System (INIS)

Caspani, Carlos; Lescano, Roberto

2008-01-01

Full text: In Radiofisica of Santa Fe, like final work of the career of Bioengineering, a phantom developed with the purpose of being used in accreditation of mammography's services, where the inserted ones that simulate small fibbers, the nodules and the micro-calcifications arrange in random form, in such a way that the professional that reads the mammographic film does not know its distribution a priori. For that reason with a taking (with the best technique, than he determines the one that makes the practice, for a normal breast of 4.2 cm of compressed thickness), the informant it indicates what sees and in what place of the film is, and thus to obtain a number; this is complemented more with two actions, on the one hand a minimum evaluation of the service is made, (that registry takes of the made studies, that structured program of qualification they have, that percentage gives them control program of repetition of film, that control of the revealed make systematically and that control of quality of the equipment carries out). In order to complete this evaluation the capture of the phantom has a TLD's chip to be able to read in addition its dose to entrance in skin, that serves next to the record as the reading as the film as phantom and the fact to me to have implemented a minimum program of QC; to determine a priori and in very fast forms, if that audited service can credit or no, to join a program of pre-clinical detection of the mammary cancer. (author)

Tasa de infección en el sitio operatorio en cirugía de revascularización miocárdica en la Fundación Santa Fe de Bogotá

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Luis E. Silva, MD

2011-05-01

Conclusiones: la profilaxis usada para cirugía cardiovascular en la Fundación Santa Fe de Bogotá ha demostrado menor incidencia de infección del sitio operatorio tanto superficial como profundo, en comparación con la que recomiendan en las guías de la ACC/AHA, sin aumentar la incidencia de resistencia a los antibióticos usados.

Caracterización de los pacientes críticos ventilados en la Fundación Santa Fe de Bogotá 2009 a 2013

OpenAIRE

Gómez Cortés, Leonardo Andrés; Bernal Ramírez, Omar Javier

2013-01-01

Objetivo: Caracterizar a los pacientes que recibieron ventilación mecánica en las unidades de cuidado intensivo (UCI) de la Fundación Santa Fe de Bogotá entre los años 2009 y 2013. Metodología: Se analizó una cohorte retrospectiva de los pacientes en UCI que requirieron soporte ventilatorio mecánico al ingreso a la unidad independientemente de la causa. Resultados: La media de edad de los pacientes fue 63,83 años; el diagnóstico más frecuente de ingreso fue revascularización miocárdi...

Evaluación de la abundancia y diversidad de lombrices de tierra en relación con el uso del suelo en el cinturón hortícola de Santa Fe (Argentina Monitoring of earthworms populations in the cinturón hortícola Santa fe (Argentina

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Carolina Elisabet Masín

2011-07-01

Full Text Available Las lombrices de tierra constituyen un componente importante en la fauna del suelo contribuyendo activa y beneficiosamente en su estructura y fertilidad. Estos organismos son sensibles ante distintos manejos y grados de perturbación del suelo respondiendo como bioindicadores de la «salud» del mismo. El Cinturón Hortícola Santafesino (Santa Fe, Argentina exhibe diferencias no sólo en tipos de cultivos sino también en sistemas de producción y condiciones de trabajo. El objetivo del estudio fue determinar la abundancia y diversidad de la oligoquetofauna en los suelos con distintos tipos de manejo en las localidades de Ángel Gallardo y Monte Vera (Dpto. La Capital, Santa Fe - Argentina. Se seleccionaron tres agroecosistemas: labranza convencional (LC, siembra directa orgánica (SDO y siembra directa (SD. En cada campo se realizaron dos muestreos, correspondiendo uno a la estación verano y el otro a otoño de 2008. Se analizaron algunas propiedades físicas y químicas de los suelos como también residuos de plaguicidas. La densidad de oligoquetos presentó diferencias por estación y sistemas de producción (p = 0,001 destacándose el sitio de SDO con el mayor número de individuos en las dos estaciones muestreadas. La taxocenosis constó de dos familias: Lumbricidae y Megascolecidae, y tres especies: Aporrectodea rosea, Aporrectodea trapezoides y Amynthas morrisi. La diversidad fue baja (H'= 0,33, siendo A. rosea la especie más común en los sitios muestreados y A. trapezoides la más abundante, incorporándose estaúltima a la lista de oligoquetos para la zona hortícola ya que en estudios anteriores no se hallaba registrada. La composición y estructura de la taxocenosis de lombrices de tierra se ve afectada no sólo por las condiciones ambientales y labores de producción, sino también por los parámetros físicos y químicos del suelo, que en conjunto condicionan la sensibilidad de la oligoquetofauna.Earthworms are an important

Preparation of Fe-Doped TiO2 Nanotubes and Their Photocatalytic Activities under Visible Light

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Honghui Teng

2013-01-01

Full Text Available Fe-doped TiO2 nanotubes (Fe-TNTs have been prepared by ultrasonic-assisted hydrothermal method. The structure and composition of the as-prepared TiO2 nanotubes were characterized by transmission electron microscopy, X-ray diffraction, and UV-Visible absorption spectroscopy. Their photocatalytic activities were evaluated by the degradation of MO under visible light. The UV-visible absorption spectra of the Fe-TNT showed a red shift and an enhancement of the absorption in the visible region compared to the pure TNT. The Fe-TNTs were provided with good photocatalytic activities and photostability and under visible light irradiation, and the optimum molar ratio of Ti : Fe was found to be 100 : 1 in our experiments.

Gobierno provincial, empresarios y CGT frente a la apertura del juego corporativo durante el primer peronismo: Santa Fe, 1952-1955

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María Mercedes Prol

2010-04-01

Full Text Available Este artículo describe los conflictos suscitados durante el primer peronismo entre el Poder Ejecutivo de Santa Fe, la Federación Económica que agrupó a los empresarios del distrito y los diputados sindicales pertenecientes a la CGT a causa de la inclusión de la mencionada Federación en la gestión de gobierno. Tales conflictos se desarrollaron en un proceso de creciente corporativización de la política. Se reconstruyen brevemente dos movimientos paralelos que fomentaron dicha corporativización: la agremiación de los empresarios radicados en la provincia, quienes lograron conformar una central única; y la acción de los diputados sindicales dentro de la Cámara Legislativa provincial

Enhanced visible-light photocatalytic activity of Fe/ZnO for rhodamine B degradation and its photogenerated charge transfer properties

International Nuclear Information System (INIS)

Yi, Shasha; Cui, Jiabao; Li, Shuo; Zhang, Lijing; Wang, Dejun; Lin, Yanhong

2014-01-01

Highlights: • ZnO and Fe/ZnO nanoflowers were synthesized via a hydrothermal process. • Fe/ZnO nanoflowers show improved photocatalytic activity under the irradiation of visible light. • In the Fe/ZnO system, Fe 3+ and Fe 2+ coexistences in the ZnO host. • The detailed photocatalytic mechanism and the role of Fe in the photodegradation system are discussed. - Abstract: Zinc oxide (ZnO) and iron doped zinc oxide (Fe/ZnO) nanoflowers were successfully synthesized via a simple hydrothermal process. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman scattering, ultraviolet–visible (UV–vis) diffuse spectroscopy and scanning electron microscopy (SEM), and it was found that the dopant ions replaced some of the crystal lattice zinc ions, and furthermore, Fe 3+ and Fe 2+ ions coexist. Photocatalytic activities of the catalysts were assessed based on the degradation of rhodamine B (RhB) in aqueous solution under both UV and visible light irradiation (λ > 420 nm), respectively. All Fe/ZnO samples showed enhanced photocatalytic activity under the irradiation of visible light. On the contrary, Fe/ZnO products displayed poorer performance than that of pure ZnO in the presence of UV light. This phenomenon can be attributed to the coexistence of Fe 3+ and Fe 2+ in the ZnO host. The photophysical mechanism of the UV and visible photocatalytic activity was investigated with the help of surface photovoltage (SPV) and PL measurements, respectively. The results indicated the influence of coexistence of Fe 3+ and Fe 2+ in ZnO host on the separation and transfer behavior of the photogenerated charges in the UV and visible regions, which are distinctly different: under the irradiation of UV light, the recombination of the photogenerated electrons and holes was promoted, whereas the separation and transfer of photogenerated electrons and holes was facilitated under the visible light irradiation. The detailed photocatalytic

Caracterización del régimen agroclimático de heladas para la provincia de Santa Fe durante el período 1979 - 2004

OpenAIRE

García, María Soledad; Leva, Perla E.; Valtorta, Silvia Elsa

2008-01-01

p.53-62 El conocimiento del régimen de las temperaturas consideradas limitantes para los cultivos, es indispensable para la toma de decisiones respecto al calendario agrícola de una región. Con datos de temperatura mínima diaria de seis localidades de la provincia de Santa Fe, donde existen estaciones del SMN (período 1979-2004) se caracterizó el régimen agroclimático de heladas meteorológicas y agronómicas. Se determinaron las fechas medias de primeras y últimas heladas, las respectivas f...

The light-induced spin transition of tetranuclear spin crossover complex [Fe4(CN)4(bpy)4(tpa)2](PF6)4

International Nuclear Information System (INIS)

Nishihara, T; Tanaka, K; Nihei, M; Oshio, H

2009-01-01

We report on the light induced spin transition in the tetranuclear spin crossover complex [Fe 4 (CN) 4 (bpy) 4 (tpa) 2 ](PF 6 ) 4 . The photo-conversion occurs at the specific site (Fe2) of four Fe II ions. The red light irradiation (1.79 eV) gives rise to full conversion of Fe2 into the high spin state from the low spin state. The green light irradiation (2.33 eV) can convert only the half of Fe2 into the high spin state, though the photo-conversion rate in the beginning is much higher than that with the red light. We present a simple model in which the photo-conversion kinetics is controlled by a large background absorption due to remaining three Fe II ions (Fe1, Fe3 and Fe4).

Enhanced visible light-responsive photocatalytic activity of LnFeO3 (Ln = La, Sm) nanoparticles by synergistic catalysis

International Nuclear Information System (INIS)

Li, Li; Wang, Xiong; Zhang, Yange

2014-01-01

Highlights: • LnFeO 3 (Ln = La, Sm) nanoparticles were prepared by a facile sol–gel method. • The samples exhibit superior visible-light-responsive photocatalytic activity. • Synergistic effect will enhance the photodegradation of RhB under visible light. - Abstract: LnFeO 3 (Ln = La, Sm) nanoparticles were prepared by a facile sol–gel method with assistance of glycol at different calcination temperatures. The as-synthesized LnFeO 3 was characterized by X-ray diffraction, transmission electron microscopy, differential scanning calorimeter and thermogravimetric analysis, and UV–vis absorption spectroscopy. The photocatalytic behaviors of LnFeO 3 nanoparticles were evaluated by photodegradation of rhodamine B under visible light irradiation. The results indicate that the visible light-responsive photocatalytic activity of LnFeO 3 nanoparticles was enhanced remarkably by the synergistic effect between the semiconductor photocatalysis and Fenton-like reaction. And a possible catalytic mechanism was also proposed based on the experimental results

Magnetically separable core–shell ZnFe_2O_4@ZnO nanoparticles for visible light photodegradation of methyl orange

International Nuclear Information System (INIS)

Kulkarni, Suresh D.; Kumbar, Sagar; Menon, Samvit G.; Choudhari, K.S.; Santhosh, C.

2016-01-01

Highlights: • Phase pure, magnetic ZnFe_2O_4@ZnO nanoparticles synthesized with excellent yield. • ZnFe_2O_4@ZnO displayed higher UV photocatalytic efficiency than ZnO nanoparticles. • First report on visible light photodegradation of methyl orange by ZnFe_2O_4@ZnO. • Excellent reusability of ZnFe_2O_4@ZnO nanoparticles observed for azo dye removal. - Abstract: Visible light photodegradation of aqueous methyl orange using magnetically separable core–shell ZnFe_2O_4@ZnO nanoparticles is reported. A combination of low temperature (190 °C) microwave synthesis and hydrothermal method were used to prepare phase pure material with excellent yield (95%). The magnetic separability, surface area of 41 m"2/g and visible light absorption make ZnFe_2O_4@ZnO nanoparticles a good solar photocatalyst. ZnFe_2O_4@ZnO displayed greater UV photocatalytic efficiency than ZnO owing to the generation of large number of electron-hole pairs. Visible light photodegradation of MO using ZnFe_2O_4@ZnO nanoparticles is reported for the first time. Higher first order rate constants under both UV and visible light for core-shell nanoparticles suggested their superiority over its individual oxides. The ZnFe_2O_4@ZnO showed excellent reusability with high photocatalytic efficiencies suggesting its suitability for solar photocatalytic applications.

Organic matter dynamics in a karstic watershed: Example from Santa Fe River, Florida, USA

Science.gov (United States)

Jin, J.; Khadka, M. B.; Martin, J. B.; Zimmerman, A. R.

2011-12-01

Organic matter (OM) dynamics in karstic watersheds can involve a range of interactions between organic and inorganic phases of carbon. These interactions include OM remineralization, which will changes its lability, increase dissolved inorganic carbon (DIC) concentrations, reduce pH, and enhance carbonate mineral dissolution. Dissolved organic carbon (DOC) concentrations are elevated in black-water rivers of northern Florida from both allochthonous and autochthonous sources and these rivers flow into and interact with the karstic Floridan Aquifer. One such river, the Santa Fe River, is split into upper confined and lower unconfined watersheds by the Cody Scarp, which represent the erosional edge of a regional confining unit. Water samples were collected from 8 sites across the entire Santa Fe River watershed (SFRW) during 9 sampling trips from December 2009 to May 2011 at flow conditions that ranged from 27 to 39 m3/s, with the highest flow about 45% higher than baseflow. At sites above the Cody Scarp, the river has elevated DOC concentrations, which decrease downstream, while dissolved inorganic carbon (DIC) and δ13C-DIC show opposite trends. At high flow, DOC concentrations progressively decrease downstream from dilution by low-DOC water discharging from the Floridan Aquifer. At low flow, the water chemistry varies little from upstream to downstream, largely because the composition of upstream water becomes similar to that of downstream water. DOC is inversely and linearly correlated with DIC and δ13C-DIC, but the slope of the correlations vary with discharge, with low flow having more negative slopes than high flow. The OM becomes more labile with distance downstream as assessed using two fluorescence indices, biological/autochthonous index (BIX) and humification index (HIX). This increase in lability suggests that DOC is produced in the river, and this production is reflected in a downstream increase in DOC flux regardless of dilution by the influx of low

Transcriptome Analysis in Haematococcus pluvialis: Astaxanthin Induction by High Light with Acetate and Fe2.

Science.gov (United States)

He, Bangxiang; Hou, Lulu; Dong, Manman; Shi, Jiawei; Huang, Xiaoyun; Ding, Yating; Cong, Xiaomei; Zhang, Feng; Zhang, Xuecheng; Zang, Xiaonan

2018-01-07

Haematococcus pluvialis is a commercial microalga, that produces abundant levels of astaxanthin under stress conditions. Acetate and Fe 2+ are reported to be important for astaxanthin accumulation in H. pluvialis . In order to study the synergistic effects of high light stress and these two factors, we obtained transcriptomes for four groups: high light irradiation (HL), addition of 25 mM acetate under high light (HA), addition of 20 μM Fe 2+ under high light (HF) and normal green growing cells (HG). Among the total clean reads of the four groups, 156,992 unigenes were found, of which 48.88% were annotated in at least one database (Nr, Nt, Pfam, KOG/COG, SwissProt, KEGG, GO). The statistics for DEGs (differentially expressed genes) showed that there were more than 10 thousand DEGs caused by high light and 1800-1900 DEGs caused by acetate or Fe 2+ . The results of DEG analysis by GO and KEGG enrichments showed that, under the high light condition, the expression of genes related to many pathways had changed, such as the pathway for carotenoid biosynthesis, fatty acid elongation, photosynthesis-antenna proteins, carbon fixation in photosynthetic organisms and so on. Addition of acetate under high light significantly promoted the expression of key genes related to the pathways for carotenoid biosynthesis and fatty acid elongation. Furthermore, acetate could obviously inhibit the expression of genes related to the pathway for photosynthesis-antenna proteins. For addition of Fe 2+ , the genes related to photosynthesis-antenna proteins were promoted significantly and there was no obvious change in the gene expressions related to carotenoid and fatty acid synthesis.

Transcriptome Analysis in Haematococcus pluvialis: Astaxanthin Induction by High Light with Acetate and Fe2+

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Bangxiang He

2018-01-01

Full Text Available Haematococcus pluvialis is a commercial microalga, that produces abundant levels of astaxanthin under stress conditions. Acetate and Fe2+ are reported to be important for astaxanthin accumulation in H. pluvialis. In order to study the synergistic effects of high light stress and these two factors, we obtained transcriptomes for four groups: high light irradiation (HL, addition of 25 mM acetate under high light (HA, addition of 20 μM Fe2+ under high light (HF and normal green growing cells (HG. Among the total clean reads of the four groups, 156,992 unigenes were found, of which 48.88% were annotated in at least one database (Nr, Nt, Pfam, KOG/COG, SwissProt, KEGG, GO. The statistics for DEGs (differentially expressed genes showed that there were more than 10 thousand DEGs caused by high light and 1800–1900 DEGs caused by acetate or Fe2+. The results of DEG analysis by GO and KEGG enrichments showed that, under the high light condition, the expression of genes related to many pathways had changed, such as the pathway for carotenoid biosynthesis, fatty acid elongation, photosynthesis-antenna proteins, carbon fixation in photosynthetic organisms and so on. Addition of acetate under high light significantly promoted the expression of key genes related to the pathways for carotenoid biosynthesis and fatty acid elongation. Furthermore, acetate could obviously inhibit the expression of genes related to the pathway for photosynthesis-antenna proteins. For addition of Fe2+, the genes related to photosynthesis-antenna proteins were promoted significantly and there was no obvious change in the gene expressions related to carotenoid and fatty acid synthesis.

Light regulated I–V hysteresis loop of Ag/BiFeO{sub 3}/FTO thin film

Energy Technology Data Exchange (ETDEWEB)

Wei, Lujun; Sun, Bai; Zhao, Wenxi; Li, Hongwei; Chen, Peng, E-mail: pchen@swu.edu.cn

2017-01-30

A hysteresis loop of current–voltage characteristics based multiferroic BiFeO{sub 3} nanoribbons memory device is observed. Moreover, the white-light can greatly regulate both the current–voltage hysteresis loop and the ferroelectric hysteresis loop. The stored space charges within the electrodes/BiFeO{sub 3} interface can lead to hysteresis-type I–V characteristics of Ag/BiFeO{sub 3}/FTO devices. The white-light controlled I–V loop and ferroelectric loop result from photon-generated carries. Since the I–V hysteresis loop and ferroelectric hysteresis loop have a potential application prospect to the memory devices, these two white-light controlled the hysteresis loops curves are likely to provide promising opportunity for developing the multi-functional memory devices.

Análisis espacial de los accidentes laborales in itinere en veterinarios de grandes animales en la provincia de Santa Fe

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Ana Inés Molineri

2016-12-01

Full Text Available En la práctica de grandes animales el profesional debe viajar frecuentemente para atender a sus clientes, exponiéndose a los riesgos del tránsito. Los objetivos de este trabajo fueron: a evaluar la frecuencia de veterinarios que sufrieron accidentes laborales in itinere (Alii en la provincia de Santa Fe y la posible asociación espacial entre los casos detectados y b estimar la percepción de los riesgos y el uso de elementos de protección personal. Se efectuó un estudio observacional sobre profesionales veterinarios que se dedican al manejo y atención de grandes animales en la provincia de Santa Fe, Argentina. El diseño fue transversal, la unidad de interés el veterinario y la población objetivo los veterinarios rurales santafesinos. La tasa de respuesta a un cuestionario estructurado que respondieron en forma anónima fue del 75,8 % (n= 562. El análisis de los datos incluyó la búsqueda de agrupamientos espaciales para poblaciones de distribución heterogénea utilizando el programa SatScan versión 9.2. La frecuencia de accidentes fue del 14,8 %. Se encontró un agrupamiento espacial (p= 0,017 en el sudeste provincial (riesgo relativo= 0,42. La frecuencia de veterinarios que sufrieron accidentes fue decreciendo desde el norte al sur de la provincia. El tránsito en rutas fue percibido como más riesgoso por una mayor proporción de entrevistados que el tránsito en caminos rurales. Las frecuencias de uso de luz baja durante el día y cinturón de seguridad fueron independientes de las percepciones del riesgo en el tránsito. Dado que la frecuencia de accidentes entre los veterinarios es alta, resulta fundamental diseñar estrategias de educación para evitar daños futuros.

La mortalidad infantil en Santa Fe, Argentina (2007-2011. Un aporte al monitoreo de los derechos de los niños

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Ana Cecilia Augsburger

2015-07-01

Full Text Available La mortalidad infantil en Santa Fe tuvo un comportamiento similar al de Argentina, acompañando el descenso que se presentó para el país, aunque siempre con valores inferiores al indicador nacional. Pese a ello, mereció particular preocupación la elevada proporción de defunciones cuyas causas se consideran reducibles con valores históricos superiores al 50%. El establecimiento de las metas internacionales conocidas como Objetivos de Desarrollo del Milenio, que bregó por la protección de los derechos de la niñez, contó con la ratificación nacional al tiempo que la provincia se comprometió con estos fijándolos como política socio-sanitaria estratégica. El estudio construyó el perfil de la mortalidad infantil de la provincia de Santa Fe durante el quinquenio 2007-2011. Se realizó un estudio epidemiológico descriptivo y transversal. La población incluyó las defunciones en menores de un año del período estudiado. Se analizó su distribución según la edad al morir, peso al nacer y lugar de ocurrencia, causas de muerte y criterios de reducibilidad. Ocurrieron 2.904 muertes de niños, obteniendo una tasa del 10,9‰, que mantuvo el comportamiento descendente previo. Las muertes neonatales duplicaron la mortalidad posneonatal y se concentraron en la primera semana de vida. Las causas más frecuentes estuvieron asociadas a los problemas perinatales. El mayor riesgo de morir fue para los niños de menos de 1.000 gramos o inmadurez extrema. El 60% de los eventos podría haberse evitado. La persistencia de muertes consideradas reducibles debería estimular para incentivar estrategias de intervenciones sociales y sanitarias más equitativas y de protección de la infancia.

La mortalidad infantil en Santa Fe, Argentina (2007-2011. Un aporte al monitoreo de los derechos de los niños

Directory of Open Access Journals (Sweden)

Ana Cecilia Augsburger

2015-01-01

Full Text Available La mortalidad infantil en Santa Fe tuvo un comportamiento similar al de Argentina, acompañando el descenso que se presentó para el país, aunque siempre con valores inferiores al indicador nacional. Pese a ello, mereció particular preocupación la elevada proporción de defunciones cuyas causas se consideran reducibles con valores históricos superiores al 50%. El establecimiento de las metas internacionales conocidas como Objetivos de Desarrollo del Milenio, que bregó por la protección de los derechos de la niñez, contó con la ratificación nacional al tiempo que la provincia se comprometió con estos fijándolos como política socio-sanitaria estratégica. El estudio construyó el perfil de la mortalidad infantil de la provincia de Santa Fe durante el quinquenio 2007-2011. Se realizó un estudio epidemiológico descriptivo y transversal. La población incluyó las defunciones en menores de un año del período estudiado. Se analizó su distribución según la edad al morir, peso al nacer y lugar de ocurrencia, causas de muerte y criterios de reducibilidad. Ocurrieron 2.904 muertes de niños, obteniendo una tasa del 10,9‰, que mantuvo el comportamiento descendente previo. Las muertes neonatales duplicaron la mortalidad posneonatal y se concentraron en la primera semana de vida. Las causas más frecuentes estuvieron asociadas a los problemas perinatales. El mayor riesgo de morir fue para los niños de menos de 1.000 gramos o inmadurez extrema. El 60% de los eventos podría haberse evitado. La persistencia de muertes consideradas reducibles debería estimular para incentivar estrategias de intervenciones sociales y sanitarias más equitativas y de protección de la infancia.

Holocene soft-sediment deformation of the Santa Fe-Sopetrán Basin, northern Colombian Andes: Evidence for pre-Hispanic seismic activity?

Science.gov (United States)

Suter, F.; Martínez, J. I.; Vélez, M. I.

2011-04-01

The detailed study of four deformed intervals from the Holocene fluvio-lacustrine deposits of the Santa Fe-Sopetrán Basin in northern Colombia shows 17 types of soft-sediment deformation (SSD) structures. Evidence indicates that seismic activity was responsible for the SSD structures, a conclusion reached after considering the environmental conditions at the time of sediment deposition and shortly after, and the detailed analysis of the driving force systems. Other triggers (i.e. overloading and rapid sedimentation), however, are not discarded. Intervals showing SSD structures occurred at centennial frequencies and apparently resulted from Mw 6-7 earthquakes. The Holocene age of these major shaking events should be seriously considered when evaluating the seismic hazard and risk for the middle Cauca Valley and the nearby city of Medellín with 3 million inhabitants.

Photodegradation of 2-mercaptobenzothiazole in the γ-Fe2O3/oxalate suspension under UVA light irradiation

International Nuclear Information System (INIS)

Wang Xugang; Liu Chengshuai; Li Xiaomin; Li Fangbai; Zhou Shungui

2008-01-01

The aim of this study is to investigate the effect of various factors on the photodegradation of organic pollutants in natural environment with co-existence of iron oxides and oxalic acid. 2-Mercaptobenzothiazole (MBT) was selected as a model pollutant, while γ-Fe 2 O 3 was selected as iron oxide. The crystal structure and morphology of the prepared γ-Fe 2 O 3 was determined by X-ray diffractograms (XRD) and scanning electron microscopy (SEM), respectively. The specific surface area was 14.36 m 2 /g by Brunauer-Emmett-Teller (BET) method. The adsorption behavior of γ-Fe 2 O 3 was evaluated by Langmuir model. The effect of the dosage of iron oxide, initial concentration of oxalic acid (C ox 0 ), initial pH value, the light intensity and additional transition metal cations on MBT photodegradation was investigated in the γ-Fe 2 O 3 /oxalate suspension under UVA light irradiation. The optimal γ-Fe 2 O 3 dosage was 0.4 g/L and the optimal C ox 0 was 0.8 mM with the UVA light intensity of 1800 mW/cm 2 . And the optimal dosage of γ-Fe 2 O 3 and C ox 0 for MBT degradation also depended strongly on the light intensity. The optimal γ-Fe 2 O 3 dosage was 0.1, 0.25 and 0.4 g/L, and the optimal C ox 0 was 1.0, 0.8, and 0.8 mM with the light intensity of 600, 1200 and 1800 mW/cm 2 , respectively. The optimal initial pH value was at 3.0. The additional transition metal cations including Cu 2+ , Ni 2+ or Mn 2+ could significantly accelerate MBT degradation. This investigation will give a new insight to understanding the MBT photodegradation in natural environment

Visible light photocatalysts (Fe, N):TiO{sub 2} from ammonothermally processed, solvothermal self-assembly derived Fe-TiO{sub 2} mesoporous microspheres

Energy Technology Data Exchange (ETDEWEB)

Zou, Mingming; Xiong, Fengqiang; Ganeshraja, Ayyakannu Sundaram [Dalian Institute of Chemical Physics (DICP), Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning, 116023 (China); Feng, Xiaohua; Wang, Chuanxi [Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201 (China); Thomas, Tiju, E-mail: tijuthomas@iitm.ac.in [Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600036, Tamil Nadu (India); Yang, Minghui, E-mail: myang@dicp.ac.cn [Dalian Institute of Chemical Physics (DICP), Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning, 116023 (China)

2017-07-01

Iron (III) and nitrogen co-doped mesoporous TiO{sub 2} microspheres (Fe-N-TiO{sub 2}) are prepared using a self-assembly based solvothermal process followed by an ammonothermal method. Among all samples, 1 mol.% of Fe dopants and 500 °C nitridation (for 2 h) gives the highest visible light photoactivity. Results imply that the Fe{sup 3+}/Fe{sup 2+} dopant trap energy level introduced within the band gap in mildly Fe (∼1 at%) doped TiO{sub 2} and the mesoporous nature of the material, both aid in the observed catalytic performance. Subjecting Fe-TiO{sub 2} samples to ammonothermal process induces oxygen vancancies, and substitutional and interstitial N. This reduces optical band gap, and introduces local states. The lower band gap and local states together aid in the absorption of visible light and separation of charge carriers. Co-dopants are distributed uniformly in the best photocatalysts. The active species generated in the photocatalytic system is shown to be singlet molecular oxygen ({sup 1}O{sub 2}) using selective radical quenchers. - Highlights: • Iron (III) and nitrogen co-doped mesoporous TiO{sub 2} microspheres (Fe-N-TiO{sub 2}) are prepared. • Fe{sup 3+}/Fe{sup 2+} dopant trap energy level introduced within the band gap in Fe (∼1 at%) doped TiO{sub 2}. • Subjecting Fe-TiO{sub 2} samples to ammonothermal process induces oxygen vancancies, and causes substitutional and interstitial N. • Co-dopants are distributed uniformly in the best photocatalysts. • Active species generated is shown to be singlet molecular oxygen ({sup 1}O{sub 2}).

The conversion of biomass to light olefins on Fe-modified ZSM-5 catalyst: Effect of pyrolysis parameters.

Science.gov (United States)

Zhang, Shihong; Yang, Mingfa; Shao, Jingai; Yang, Haiping; Zeng, Kuo; Chen, Yingquan; Luo, Jun; Agblevor, Foster A; Chen, Hanping

2018-07-01

Light olefins are the key building blocks for the petrochemical industry. In this study, the effects of in-situ and ex-situ process, temperature, Fe loading, catalyst to feed ratio and gas flow rate on the olefins carbon yield and selectivity were explored. The results showed that Fe-modified ZSM-5 catalyst increased the olefins yield significantly, and the ex-situ process was much better than in-situ. With the increasing of temperature, Fe-loading amount, catalyst to feed ratio, and gas flow rate, the carbon yields of light olefins were firstly increased and further decreased. The maximum carbon yield of light olefins (6.98% C-mol) was obtained at the pyrolysis temperature of 600°C, catalyst to feed ratio of 2, gas flow rate of 100ml/min, and 3wt% Fe/ZSM-5 for cellulose. The selectivity of C 2 H 4 was more than 60% for all feedstock, and the total light olefins followed the decreasing order of cellulose, corn stalk, hemicelluloses and lignin. Copyright © 2018 Elsevier B.V. All rights reserved.

Multifunctional polyoxometalates encapsulated in MIL-100(Fe): highly efficient photocatalysts for selective transformation under visible light.

Science.gov (United States)

Liang, Ruowen; Chen, Rui; Jing, Fenfen; Qin, Na; Wu, Ling

2015-11-07

H3PMo12O40 molecules have been successfully encapsulated in the cavities of MIL-100(Fe) via a facile hydrothermal method (denoted as HPMo@MIL-100(Fe)). A series of characterization has corroborated the insertion of H3PMo12O40 within the cavities of MIL-100(Fe). The resulting HPMo@MIL-100(Fe) nanocomposites have exhibited much higher photoactivity than the original-MIL-100(Fe) toward the photocatalytic selective oxidation of benzylic alcohols and the reduction of Cr(vi) under visible light irradiation (λ≥ 420 nm). The higher photoactivity of HPMo@MIL-100(Fe) can be attributed to the integrative effect of enhanced light absorption intensity and more efficient separation of photogenerated electron-hole pairs. The host porous structure of MIL-100(Fe) can achieve a uniform composition with H3PMo12O40, which is significantly important for producing highly reactive dispersed H3PMo12O40 molecules and enhancing the photocatalytic activity of HPMo@MIL-100(Fe) nanocomposites. And the immobilized H3PMo12O40 molecules are more convenient for recycling. Importantly, almost no Fe and Mo ions leach from the MIL-100(Fe) during the reaction, which verifies the photostability of the HPMo@MIL-100(Fe). In addition, possible photocatalytic redox reaction mechanisms have been investigated.

Preparation, characterization and photocatalytic activity of visible-light-driven plasmonic Ag/AgBr/ZnFe2O4 nanocomposites

International Nuclear Information System (INIS)

Li, Xiaojuan; Tang, Duanlian; Tang, Fan; Zhu, Yunyan; He, Changfa; Liu, Minghua; Lin, Chunxiang; Liu, Yifan

2014-01-01

Highlights: • A plasmonic Ag/AgBr/ZnFe 2 O 4 photocatalyst has been successfully synthesized. • Ag/AgBr/ZnFe 2 O 4 nanocomposites exhibit high visible light photocatalytic activity. • Ag/AgBr/ZnFe 2 O 4 photocatalyst is stable and magnetically separable. - Abstract: A visible-light-driven plasmonic Ag/AgBr/ZnFe 2 O 4 nanocomposite has been successfully synthesized via a deposition–precipitation and photoreduction through a novel one-pot process. X-ray diffraction spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and UV–vis diffuse reflectance spectroscopy were employed to investigate the crystal structure, chemical composition, morphology, and optical properties of the as-prepared nanocomposites. The photocatalytic activities of the nanocomposites were evaluated by photodegradation of Rhodamine B (RhB) and phenol under visible light. The results demonstrated that the obtained Ag/AgBr/ZnFe 2 O 4 nanocomposites exhibited higher photocatalytic activity as compared to pure ZnFe 2 O 4 . In addition, the sample photoreduced for 20 min and calcined at 500 °C achieved the highest photocatalytic activity. Furthermore, the Ag/AgBr/ZnFe 2 O 4 nanocomposite has high stability under visible light irradiation and could be conveniently separated by using an external magnetic field

A practical pathway for the preparation of Fe_2O_3 decorated TiO_2 photocatalyst with enhanced visible-light photoactivity

International Nuclear Information System (INIS)

Cheng, Li; Qiu, Shoufei; Chen, Juanrong; Shao, Jian; Cao, Shunsheng

2017-01-01

Shifting the ultra-violet of titania to visible light driven photocatalysis can be realized by coupling with metallic or non-metallic elements. However, time-consuming multi-step process and significant loss of UV photocatalytic activity of such TiO_2-based photocatalysts severely hinder their practical applications. In this work, we explore the idea of creating a practical method for the preparation of Fe_2O_3 decorated TiO_2 (TiO_2/Fe_2O_3) photocatalyst with controlled visible-light photoactivity. This method only involves the calcination of the mixture (commercial P25 powders and magnetic Fe_3O_4 nanoparticles) prepared by a mechanical process. The morphology and properties of TiO_2/Fe_2O_3 composites were characterized by Transmission electron microscope, X-ray diffraction, UV–vis spectroscopy, and X-ray photoelectron spectroscopy. Results confirm the fusion of TiO_2 and Fe_2O_3, which promotes photo-generated electrons/holes migration and separation. Because of the strong synergistic effect, the as-synthesized TiO_2/Fe_2O_3 composites manifest an enhanced visible-light photocatalytic activity. Especially, the TiO_2/Fe_2O_3 photocatalyst is very easy to be constructed via an one-step protocol that efficiently overcomes the time-consuming multi-step processes used in existed strategies for the preparation of Fe_2O_3/TiO_2 photocatalysts, providing a new insight into the practical application of TiO_2/Fe_2O_3 visible light photocatalyst. - Highlights: • We introduced a practical preparation of Fe_2O_3 decorated TiO_2 photocatalyst. • TiO_2/Fe_2O_3 was developed using commercial precursors in a high efficient manner. • Visible-light activity of TiO_2/Fe_2O_3 could be tuned by changing amount of Fe_3O_4 precursor. • TiO_2/Fe_2O_3 exhibited a higher visible-light photocatalytic activity than P25.

Saturated and trans fatty acids content in unpackaged traditional bakery products in Santa Fe city, Argentina: nutrition labeling relevance.

Science.gov (United States)

Negro, Emilse; González, Marcela Aída; Bernal, Claudio Adrián; Williner, María Rosa

2017-08-01

Studies have reported the relationship between the excessive intake of saturated fatty acids (SFA) and trans fatty acids (t-FA) and an increased risk of cardiovascular disease. Since 2006, the MERCOSUR countries require that the mandatory nutrition labeling should include information not only about the content of SFA but also about the content of t-FA. This does not apply to fractionated products at the point of retail, such as bakery products. This paper aimed to determine the total fat content and the fatty acid profile in unpackaged traditional bakery products (breads, biscuits and pastries) in Santa Fe, Argentina. Except for French bread, the contribution of t-FA and SFA to the total FA consumption from baked products was high. On the other hand, due to the high variability detected in the FA composition of bakery products between bakeries, it would be necessary to implement regulations making nutrition labeling mandatory in these products.

Enhanced visible light photocatalytic properties of Fe-doped TiO2 nanorod clusters and monodispersed nanoparticles

International Nuclear Information System (INIS)

Liu, Y.; Wei, J.H.; Xiong, R.; Pan, C.X.; Shi, J.

2011-01-01

In order to get photocatalysts with desired morphologies and enhanced visible light responses, the Fe-doped TiO 2 nanorod clusters and monodispersed nanoparticles were prepared by modified hydrothermal and solvothermal method, respectively. The microstructures and morphologies of TiO 2 crystals can be controlled by restraining the hydrolytic reaction rates. The Fe-doped photocatalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-vis absorption spectroscopy (UV-vis), N 2 adsorption-desorption measurement (BET), and photoluminescence spectroscopy (PL). The refinements of the microstructures and morphologies result in the enhancement of the specific surface areas. The Fe 3+ -dopants in TiO 2 lattices not only lead to the significantly extending of the optical responses from UV to visible region but also diminish the recombination rates of the electrons and holes. The photocatalytic activities were evaluated by photocatalytic decomposition of formaldehyde in air under visible light illumination. Compared with P25 (TiO 2 ) and N-doped TiO 2 nanoparticles, the Fe-doped photocatalysts show high photocatalytic activities under visible light.

Investigating Planetesimal Evolution by Experiments with Fe-Ni Metallic Melts: Light Element Composition Effects on Trace Element Partitioning Behavior

Science.gov (United States)

Chabot, N. L.

2017-12-01

As planetesimals were heated up in the early Solar System, the formation of Fe-Ni metallic melts was a common occurrence. During planetesimal differentiation, the denser Fe-Ni metallic melts separated from the less dense silicate components, though some meteorites suggest that their parent bodies only experienced partial differentiation. If the Fe-Ni metallic melts did form a central metallic core, the core eventually crystallized to a solid, some of which we sample as iron meteorites. In all of these planetesimal evolution processes, the composition of the Fe-Ni metallic melt influenced the process and the resulting trace element chemical signatures. In particular, the metallic melt's "light element" composition, those elements present in the metallic melt in a significant concentration but with lower atomic masses than Fe, can strongly affect trace element partitioning. Experimental studies have provided critical data to determine the effects of light elements in Fe-Ni metallic melts on trace element partitioning behavior. Here I focus on combining numerous experimental results to identify trace elements that provide unique insight into constraining the light element composition of early Solar System Fe-Ni metallic melts. Experimental studies have been conducted at 1 atm in a variety of Fe-Ni systems to investigate the effects of light elements on trace element partitioning behavior. A frequent experimental examination of the effects of light elements in metallic systems involves producing run products with coexisting solid metal and liquid metal phases. Such solid-metal-liquid-metal experiments have been conducted in the Fe-Ni binary system as well as Fe-Ni systems with S, P, and C. Experiments with O-bearing or Si-bearing Fe-Ni metallic melts do not lend themselves to experiments with coexisting solid metal and liquid metal phases, due to the phase diagrams of these elements, but experiments with two immiscible Fe-Ni metallic melts have provided insight into

Determinación de la rugosidad superficial y anchos de inundación en la planicie del río Salado (Santa Fe) para la crecida de 2003

OpenAIRE

Imhoff, Matías; Trento, Alfredo

2012-01-01

Las planicies de inundación en ríos de llanura cumplen un papel fundamental en las crecidas, puesto que almacenan y conducen una parte importante del caudal, de lo cual se deriva la importancia de la correcta representación de la rugosidad superficial en las modelaciones hidrodinámicas. La zona de estudio corresponde al tramo del río Salado (Santa Fe, Argentina) comprendido entre la confluencia con el Arroyo Cululú y la ruta provincial N° 70. El objetivo fue determinar la rugosidad superficia...

Workshop on geologic data requirements for radioactive waste management assessment models, Santa Fe, New Mexico, June 28--July 1, 1976

International Nuclear Information System (INIS)

1976-09-01

Exchange of information is needed among persons working in two broad categories of studies concerned with terminal storage of radioactive waste. These two categories are: (1) investigations of several types of geologic formations in a number of locations to determine suitability for use with various emplacement techniques, and (2) development of models for the ERDA, NRC, and EPA, for the general purpose of assessing the long term safety of terminal storage facilities. The Workshop held in Santa Fe, New Mexico, June 28-July 1, 1976, sponsored by the Office of Waste Isolation and arranged by The University of New Mexico addressed this need. Presentations covered background topics of: geologic studies being made, methods for risk analysis, assessment models being developed, and descriptions of field observations of radionuclide migration. During vigorous discussion periods, a list of items to be jointly attacked by geologists and modelers was worked out

[Diversity of birds in the Agricultural Center Cotové, Santa Fe de Antioquia, Colombia].

Science.gov (United States)

Martínez-Bravo, Caty Milena; Mancera-Rodríguez, Néstor Javier; Buitrago-Franco, Germán

2013-12-01

Fragmentation of natural habitats is a central concern of biodiversity conservation and is considered a significant factor contributing to species loss and populations decline. We studied this in Cotové Agricultural Center in the municipality of Santa Fe de Antioquia (Colombia),where the conversion of natural forests to different land use systems, has limited the amount of available habitat. With the aim to describe the effect of habitat loss on bird presence in five land uses (fruiting trees, silvopastoral systems, secondary forest, pasture low density of trees and grass cutting) in this area, we studied bird diversity using two methods: fixed point counts and mist nets to analyze the influence of land use in the composition, richness and abundance of birds present were studied. A total of 6633 individuals of 101 species were observed of which 11 species were migratory. The insectivorous and frugivorous foraging guilds were better represented. The Shannon index indicated the highest values of alpha diversity for the silvopastoral system, and the fruit with the lowest. The grazing and silvopastoral land systems shared more species with low tree density. The importance of the environmental heterogeneity found is highlighted as a positive factor for bird species richness, mostly of low and middle habitat specificity, and preferably from edge habitats and open areas. In order to preserve natural regeneration and connectivity between different land use types, and to promote stability of bird species populations, some management actions should be implemented in the area.

Photocatalytic degradation of methylene blue on Fe3+-doped TiO2 nanoparticles under visible light irradiation

Institute of Scientific and Technical Information of China (English)

SU Bitao; WANG Ke; BAI Jie; MU Hongmei; TONG Yongchun; MIN Shixiong; SHE Shixiong; LEI Ziqiang

2007-01-01

Fe3+-doped TiO2 composite nanoparticles with different doping amounts were successfully synthesized using sol-gel method and characterized by X-ray diffraction (XRD),transmission electron microscopy (TEM) and ultraviolet-visible spectroscopy (UV-Vis) diffuse reflectance spectra (DRS). The photocatalytic degradation of methylene blue was used as a model reaction to evaluate the photocatalytic activity of Fe3+/TiO2 nanoparticles under visible light irradia-tion. The influence of doping amount of Fe3+ (ω: 0.00%-3.00%) on photocatalytic activities of TiO2 was investigated.Results show that the size of Fe3+/TiO2 particles decreases with the increase of the amount of Fe3+ and their absorptionspectra are broaden and absorption intensities are also increased. Doping Fe3+ can control the conversion of TiO2 from anatase to rutile. The doping amount of Fe3+ remarkably affects the activity of the catalyst, and the optimum efficiency occurs at about the doping amount of 0.3%. The appropriate doping of Fe3+ can markedly increase the catalytic activity of TiO2 under visible light irradiation.

Preparation and photocatalytic performance of Fe (III)-amidoximated PAN fiber complex for oxidative degradation of azo dye under visible light irradiation

Energy Technology Data Exchange (ETDEWEB)

Dong, Yongchun, E-mail: dye@tjpu.edu.cn [Division of Textile Chemistry and Ecology, School of Textile Science and Engineering, Tianjin Polytechnic University, Tianjin 300160 (China); State Key Laboratory Breeding Base of Photocatalysis, Fuzhou University, Fuzhou, 350002 (China); Han, Zhenbang [Division of Textile Chemistry and Ecology, School of Textile Science and Engineering, Tianjin Polytechnic University, Tianjin 300160 (China); Liu, Chunyan [Division of Textile Chemistry and Ecology, School of Textile Science and Engineering, Tianjin Polytechnic University, Tianjin 300160 (China); State Key Laboratory Breeding Base of Photocatalysis, Fuzhou University, Fuzhou, 350002 (China); Du, Fang [Division of Textile Chemistry and Ecology, School of Textile Science and Engineering, Tianjin Polytechnic University, Tianjin 300160 (China)

2010-04-15

Polyacrylonitrile (PAN) fiber was modified with hydroxylamine hydrochloride to introduce amidoxime groups onto the fiber surface. These amidoxime groups were used to react with Fe (III) ions to prepare Fe (III)-amidoximated PAN fiber complex, which was characterized using SEM, XRD, FTIR, XPS, DMA, and DRS respectively. Then the photocatalytic activity of Fe-AO-PAN was evaluated in the degradation of a typical azo dye, C. I. Reactive Red 195 in the presence of H{sub 2}O{sub 2} under visible light irradiation. Moreover, the effect of the Fe content of Fe-AO-PAN on dye degradation was also investigated. The results indicated that Fe (III) ions can crosslink between the modified PAN fiber chains by the coordination of Fe (III) ions with the amino nitrogen atoms and hydroxyl oxygen atoms of the amidoximation groups to form Fe (III)-amidoximated PAN fiber complex, and the Fe content of which is mainly determined by Fe (III) ions and amidoximation groups. Fe (III)-amidoximated PAN fiber complex is found to be activated in the visible light region. Moreover, Fe (III)-amidoximated PAN fiber complex shows the catalytic activity for dye degradation by H{sub 2}O{sub 2} at pH = 6.0 in the dark, and can be significantly enhanced by increasing light irradiation and Fe content, therefore, it can be used as a new heterogeneous Fenton photocatalyst for the effective decomposition of the dye in water. In addition, ESR spectra confirm that Fe (III)-amidoximated PAN fiber complex can generate more {center_dot}OH radicals from H{sub 2}O{sub 2} under visible light irradiation, leading to dye degradation. A possible mechanism of photocatalysis is proposed.

Descripción de un brote de leptospirosis en la ciudad de Santa Fe, Argentina, marzo-abril de 1998 Description of a leptospirosis outbreak in the city of Santa Fe, Argentina, March-April 1998

Directory of Open Access Journals (Sweden)

Norma B. Vanasco

2000-01-01

Full Text Available En marzo-abril de 1998 se identificó en un barrio de la ciudad de Santa Fe (Argentina un brote de una enfermedad aguda caracterizada por fiebre, cefaleas y mialgias intensas. Se presentan los estudios realizados en relación con este brote y los intentos de identificación de la fuente y del modo de transmisión. Los hallazgos epidemiológicos, serológicos y clínicos indicaron que el agente causal fue Leptospira interrogans. Como prueba de tamizaje se aplicó la técnica de aglutinación macroscópica con antígeno termorresistente, seguida de la prueba de ELISA y, como prueba de confirmación, la aglutinación microscópica frente a 10 serovariedades de L. interrogans. Se estudiaron 32 individuos, 8 perros y 8 muestras de agua. Se registraron 12 casos confirmados, 2 probables y 18 negativos. En seis perros se demostró la existencia de infección y en las muestras de agua se detectó la presencia de espiroquetas móviles. Los sueros humanos reaccionaron con las serovariedades ballum, canicola, icterohaemorrhagiae y pyrogenes, y los caninos con ballum, canicola y pomona. La coaglutinación observada en todos los casos confirmados indica que se trató de casos agudos de leptospirosis, pero no permite identificar la serovariedad causal. Salvo en el caso índice, no se reconoció clínicamente la enfermedad. Varios hechos sugieren que la causa del brote fue la inundación pluvial de la zona estudiada. Los resultados de este estudio resaltan la necesidad de una vigilancia activa de la leptospirosis ante desastres naturales como las inundaciones.In March-April 1998 in a neighborhood in the city of Santa Fe, Argentina, there was an outbreak of an acute disease characterized by fever, headaches, and intense myalgias. This article presents the studies surrounding this outbreak and the attempts to identify the source and the mode of transmission. The epidemiological, serological, and clinical findings indicated that the causative agent was Leptospira

Considerations on the feasibility of using wind energy for electricity generation in the regional areas of the Province of Santa Fe, Argentina; Consideraciones sobre la viabilidad del uso de energia eolica para la generacion de electricidad en el ambito regional de la Provincia de Santa Fe

Energy Technology Data Exchange (ETDEWEB)

Gibbons, Roberto E.; Nachez, Antonio E. [Universidad Nacional de Rosario (Argentina). Fac. de Ciencias Exactas, Ingenieria y Agrimensura. Dept. de Electronica], Emails: rgibbons@eie.fceia.unr.edu.ar, anachez@eie.fceia.unr.edu.ar

2009-07-01

This article presents the current status of the use of wind power and evaluating the factors that affecting the implementation in the generation of electricity. From information available on the winds in four cities in the Santa Fe Province, calculate the potential of generation to determine the feasibility of using energy wind as an alternative source of energy in the province. The information was provided by the Ministry of Defence, Ministry of Planning, National Weather Service Meteorological Information Center and consists of a total of 8462 measurements of wind speed and direction in hourly intervals during each day of the year 2007, in weather stations located in the towns of Ceres, Rosario, Reconquista and Sauce Viejo. Using data collected by weather stations in the expressions for the calculation of available power in the wind, it is shown that the study areas are not suitable for utilization of wind energy.

Cumplimiento de las recomendaciones de prevención secundaria de enfermedad coronaria en pacientes sometidos a revascularización coronaria percutánea en el Hospital Universitario Fundación Santa Fe de Bogotá

Directory of Open Access Journals (Sweden)

César J Villalobos

2013-04-01

Full Text Available Marco de referencia: diferentes ensayos clínicos han mostrado que el efecto de las revascularizaciones y los procedimientos de angioplastia en el pronóstico del paciente, tiene sólo un efecto a corto plazo, mientras que la prevención secundaria (cambio de estilo de vida y tratamiento intensivo mejora el pronóstico a largo plazo. Objetivo: evaluar el cumplimiento de las recomendaciones para prevención cardiovascular secundaria, de los pacientes sometidos a revascularización coronaria percutánea en el hospital universitario Fundación Santa Fe de Bogotá, entre los anos 2008 y 2010. Materiales y métodos: estudio descriptivo, ambispectivo, cuya población estuvo conformada por 332 pacientes sometidos a intervención coronaria percutánea atendidos entre enero de 2008 a diciembre de 2010 en el servicio de hemodinamia del Hospital Universitario Fundación Santa Fe de Bogotá. La recolección de la información se realizó mediante revisión de las historias clínicas de los pacientes y vía telefónica. Las metas de control se basaron en las recomendaciones de la Asociación Americana del Corazón y el Colegio Americano de Cardiología. Resultados: 332 pacientes fueron sometidos a revascularización coronaria percutánea y 4 fueron excluidos del estudio por falta de datos. La presentación clínica más frecuente fue la angina inestable (32,93%. Sólo se contactaron 172 (52,43% pacientes, de los cuales 77,4% eran hombres y 22,6% mujeres. Únicamente 6 (3,5% cumplían con el 100% de las recomendaciones para la prevención secundaria de enfermedad coronaria y 17% cumplía menos del 50% de éstas. Conclusiones: la experiencia en la Fundación Santa Fe de Bogotá muestra un pobre cumplimiento de las metas de prevención secundaria de enfermedad coronaria.

Bactericidal effect of blue LED light irradiated TiO2/Fe3O4 particles on fish pathogen in seawater

International Nuclear Information System (INIS)

Cheng, T.C.; Yao, K.S.; Yeh, N.; Chang, C.I.; Hsu, H.C.; Gonzalez, F.; Chang, C.Y.

2011-01-01

This study uses blue LED light (λ max = 475 nm) activated TiO 2 /Fe 3 O 4 particles to evaluate the particles' photocatalytic activity efficiency and bactericidal effects in seawater of variable salinities. Different TiO 2 to Fe 3 O 4 mole ratios have been synthesized using sol-gel method. The synthesized particles contain mainly anatase TiO 2 , Fe 3 O 4 and FeTiO 3 . The study has identified TiO 2 /Fe 3 O 4 's bactericidal effect to marine fish pathogen (Photobacterium damselae subsp. piscicida BCRC17065) in seawater. The SEM photo reveals the surface destruction in bacteria incubated with blue LED irradiated TiO 2 /Fe 3 O 4 . The result of this study indicates that 1) TiO 2 /Fe 3 O 4 acquires photocatalytic activities in both the freshwater and the seawater via blue LED irradiation, 2) higher photocatalytic activities appear in solutions of higher TiO 2 /Fe 3 O 4 mole ratio, and 3) photocatalytic activity decreases as salinity increases. These results suggest that the energy saving blue LED light is a feasible light source to activate TiO 2 /Fe 3 O 4 photocatalytic activities in both freshwater and seawater.

La cocina del trabajo periodístico. Desigualdades de género y distribución de poder en las redacciones informativas de la provincia de Santa Fe

Directory of Open Access Journals (Sweden)

Florencia Laura Rovetto

2015-12-01

Full Text Available En este trabajo abordamos las condiciones de producción de los mensajes periodísticos y las prácticas laborales teniendo en cuenta la distribución de poder y su articulación con los condicionantes de género en los medios informativos de la provincia de Santa Fe en un contexto determinado por planes y normativas provinciales y nacionales destinadas a fomentar el acceso y la participación de las mujeres en la producción de contenidos mediáticos. Para ello, en primer lugar, revisamos los antecedentes sobre la temática y su grado de desarrollo en el país con el fin de analizar las posibilidades que brindan para abordar este campo problemático en la actualidad. En segundo lugar, presentamos los resultados obtenidos a partir de la realización de una encuesta destinada a relevar el perfil de los profesionales que trabajan en los medios informativos de las principales ciudades de la provincia, así como sus percepciones en torno a desigualdades de género en las organizaciones y rutinas periodísticas. Hemos podido constatar que la participación diferenciada de varones y mujeres en las "cocinas" informativas de la provincia de Santa Fe pone en evidencia la persistencia de una "cultura periodística" masculina que lejos está de aproximarse a los principios emanados de las legislaciones sobre la igualdad de oportunidades y acceso equilibrado del conjunto de profesionales en las organizaciones mediáticas.

Violencia física contra la mujer en Santa Fe de Bogotá: prevalencia y factores asociados

Directory of Open Access Journals (Sweden)

Klevens Joanne

2001-01-01

Full Text Available Objetivos. Estimar la magnitud del problema de la violencia conyugal que afecta a las mujeres que acuden a los servicios de salud pública en Santa Fe de Bogotá, Colombia, e identificar los factores asociados con el riesgo de ser agredidas físicamente. Métodos. Se analizaron los datos recolectados desde septiembre de 1998 hasta septiembre de 1999 mediante entrevistas de las 3 971 mujeres con niños menores de 6 meses de edad, que solicitaron consulta por diversas causas pediátricas (control del niño sano, vacunación o morbilidad del menor o fueron atendidas por parto en la red de servicios de salud pública en la localidad de Suba, Santa Fe de Bogotá, Colombia. De la muestra indicada, 10 mujeres rehusaron participar y 804 no tenían compañero, por lo cual se excluyeron de los análisis. Resultados. De las 3 157 participantes que convivían con un compañero íntimo, 26,5% informaron que habían sido abofeteadas o empujadas por su compañero actual y 13,3% que habían sido agredidas gravemente por medio de golpes con el puño cerrado, patadas, golpes con algún objeto, "golpizas" y amenazas con un cuchillo o arma de fuego. Además de lo anterior, 26,2% de ellas indicaron que su compañero les imponía alguna prohibición. En los análisis bivariados, la violencia se asoció significativamente con menos escolaridad y menores ingresos (P < 0,001, mayor número de hijos (P < 0,001, mayor tiempo de unión con el compañero actual (P < 0,001, mayor frecuencia de conflicto con la pareja (P < 0,001, ausencia de otros familiares en el hogar (P < 0,01, historia de maltrato en la familia de origen (P < 0,001 y prohibiciones por parte del compañero (P < 0,001. La frecuencia del conflicto con la pareja y las prohibiciones fueron los factores más fuertemente asociados con la violencia, según el análisis multivariado. Conclusiones. Los servicios de salud pública son un buen lugar para detectar a las víctimas de la violencia intrafamiliar. Deben

Preparation And Characterization of Cu-Fe/ TiO2 Photocatalyst for Visible Light Deep Desulfurization

International Nuclear Information System (INIS)

Hayyiratul Fatimah Mohd Zaid; Kait, C.F.; Mohamed Ibrahim Abdul Mutalib

2016-01-01

A photooxidative system for deep desulfurization of model diesel fuel was explored. Nanoparticles of anatase titania (TiO 2 ) were synthesized via sol-gel hydrothermal method. The TiO 2 was further modified with bimetallic Cu-Fe using wet-impregnation method followed by calcination process in order to extend the activity region of the photocatalyst to visible-light. A series of bimetallic 2.2 wt % Cu-Fe/ TiO 2 photocatalysts with different Cu:Fe mass compositions were characterized for their physical, chemical and optical properties using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), diffuse reflectance UV-visible spectroscopy (DR-UV-Vis), Fourier Transform Infrared Spectroscopy (FTIR) and Brunauer-Emmet-Teller (BET) surface area analysis. The performance of the photocatalysts was evaluated for photooxidation of dibenzothiophene (DBT) as the sulfur species from model oil in the presence of hydrogen peroxide, H 2 O 2 under 500 W visible light illumination. The highest sulfur conversion of 82.36 % was observed for photocatalyst with 10:1Cu:Fe mass composition. (author)

Pure and Fe-Doped Mesoporous Titania Catalyse the Oxidation of Acid Orange 7 by H2O2 under Different Illumination Conditions: Fe Doping Improves Photocatalytic Activity under Simulated Solar Light

Directory of Open Access Journals (Sweden)

Francesca S. Freyria

2017-07-01

Full Text Available A sample of mesoporous TiO2 (MT, specific surface area = 150 m2·g−1 and two samples of MT containing 2.5 wt.% Fe were prepared by either direct synthesis doping (Fe2.5-MTd or impregnation (Fe2.5-MTi. Commercial TiO2 (Degussa P25, specific surface area = 56 m2 g−1 was used both as a benchmark and as a support for impregnation with either 0.8 or 2.5 wt.% Fe (Fe0.80-IT and Fe2.5-IT. The powders were characterized by X-ray diffraction, N2 isotherms at −196 °C, Energy Dispersive X-ray (EDX Spectroscopy, X-ray Photoelectron Spectroscopy (XPS, Diffuse Reflectance (DR ultra-violet (UV-Vis and Mössbauer spectroscopies. Degradation of Acid Orange 7 (AO7 by H2O2 was the test reaction: effects of dark-conditions versus both UV and simulated solar light irradiation were considered. In dark conditions, AO7 conversion was higher with MT than with Degussa P25, whereas Fe-containing samples were active in a (slow Fenton-like reaction. Under UV light, MT was as active as Degussa P25, and Fe doping enhanced the photocatalytic activity of Fe2.5-MTd; Fe-impregnated samples were also active, likely due to the occurrence of a photo-Fenton process. Interestingly, the Fe2.5-MTd sample showed the best performance under solar light, confirming the positive effect of Fe doping by direct synthesis with respect to impregnation.

High-resolution velocity measurements on fully identified light nuclides produced in {sup 56}Fe + protons and {sup 56}Fe + titanium systems

Energy Technology Data Exchange (ETDEWEB)

Napolitani, P. [Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany)]|[Institut de Physique Nucleaire (IPN), 91 - Orsay (France); Schmidt, K.H. [Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany); Botvina, A.S. [Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany)]|[Rossijskaya Akademiya Nauk, Moscow (Russian Federation). Inst. Yadernykh Issledovanij; Rejmund, F.; Tassan-Got, L. [Institut de Physique Nucleaire (IPN), 91 - Orsay (France); Villagrasa, C. [CEA Centre d' Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (FR). Dept. d' Astrophysique, de Physique des Particules, de Physique Nucleaire et de l' Instrumentation Associee (DAPNIA)

2004-07-01

New experimental results on the kinematics and the residue production are obtained for the interactions of {sup 56}Fe projectiles with protons and {sup nat}Ti target nuclei, respectively, at the incident energy of 1 A GeV. The titanium-induced reaction serves as a reference case for multifragmentation. Already in the proton-induced reaction, the characteristics of the isotopic cross sections and the shapes of the velocity spectra of light residues indicate that high thermal energy is deposited in the system during the collision. In the {sup 56}Fe+p system the high excitation seems to favour the onset of fast break-up decays dominated by very asymmetric partitions of the disassembling system. This configuration leads to the simultaneous formation of one or more light fragments together with one heavy residue. (orig.)

Visible light activated catalytic effect of iron containing soda-lime silicate glass characterized by 57Fe-Moessbauer spectroscopy

International Nuclear Information System (INIS)

Shiro Kubuki; Jun Iwanuma; Yusuke Takahashi; Kazuhiko Akiyama; Ernoe Kuzmann; Hungarian Academy of Sciences, Budapest; Tetsuaki Nishida

2014-01-01

A relationship between local structure and visible light activated catalytic effect of iron containing soda lime silicate glass with the composition of 15Na 2 O·15CaO·xFe 2 O 3 ·(70-x)SiO 2 , x = 5-50 mass %, abbreviated as NCFSx was investigated by means of 57 Fe-Moessbauer spectroscopy, X-ray diffractometry (XRD), small angle X-ray scattering (SAXS), electrospray ionization mass spectrometry (ESI-MS) and ultraviolet-visible light absorption spectroscopy (UV-Vis). Moessbauer spectra of NCFSx glass with 'x' being equal to or larger than 30 after isothermal annealing at 1,000 deg C for 100 min consisted of a paramagnetic doublet and a magnetic sextet. The former had isomer shift (δ) of 0.24 mm s -1 and quadrupole splitting (Δ) of 0.99 mm s -1 due to distorted Fe III O 4 tetrahedra, and the latter had δ of 0.36 mm s -1 and internal magnetic field (H int ) of 51.8 T due to hematite (α-Fe 2 O 3 ). The absorption area (A) of α-Fe 2 O 3 varied from 47.2 to 75.9, 93.1, 64.8 and 47.9 % with 'x' from 30 to 35, 40, 45 and 50, indicating that the amount of precipitated α-Fe 2 O 3 varied with the Fe 2 O 3 content of NCFSx glass. The precipitation of α-Fe 2 O 3 was also confirmed by XRD study of annealed NCFS glass with 'x' larger than 30. A relaxed sexted with δ, H int and Γ of 0.34 mm s -1 and 37.9 T and 1.32 mm s -1 was observed from the Moessbauer spectra of annealed NCFSx glass with 'x' of 45 and 50, implying that the precipitation of non-stoichiometric iron hydroxide oxide with the composition of Fe 1.833 (OH) 0.5 O 2.5 having the similar structure of α-Fe 2 O 3 and α-FeOOH. A remarkable decrease in the concentration of methylene blue (MB) from 10 to 0.0 μmol L -1 with the first-order rate constant (k) of 2.87 × 10 -2 h -1 was observed for 10-day leaching test using annealed NCFS50 glass under visible light irradiation. ESI-MS study indicated that existence of fragments with m/z value of 129, 117 and 207 etc. originating from MB having m/z of 284. This

Enhanced visible-light-response photocatalytic degradation of methylene blue on Fe-loaded BiVO4 photocatalyst

International Nuclear Information System (INIS)

Chala, Sinaporn; Wetchakun, Khatcharin; Phanichphant, Sukon; Inceesungvorn, Burapat; Wetchakun, Natda

2014-01-01

Highlights: • Fe-loaded BiVO 4 particles were prepared by hydrothermal method. • Physicochemical properties played a significant role in photocatalytic process. • All Fe-loaded BiVO 4 samples showed higher photocatalytic activity than pure BiVO 4 . • The Fe 3+ ions may improve the separation of photogenerated electrons and holes. - Abstract: Pure BiVO 4 and nominal 0.5–5.0 mol% Fe-loaded BiVO 4 samples were synthesized by hydrothermal method. All samples were characterized in order to obtain the correlation between structure and photocatalytic properties by X-ray diffraction, Brunauer, Emmett and Teller, UV–vis diffuse reflectance spectrophotometry, photoluminescence spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and inductively coupled plasma-optical emission spectroscopy. The structure of all samples was single-phase monoclinic scheelite. The absorption spectrum of 5.0 mol% Fe-loaded BiVO 4 shifted to the visible region, suggesting the potential application of this material as a superior visible-light driven photocatalyst in comparison with pure BiVO 4 . Photocatalytic activities of all photocatalyst samples were examined by studying the degradation of methylene blue under visible light irradiation. The results clearly showed that Fe-loaded BiVO 4 sample exhibited remarkably higher activity than pure BiVO 4

Los derechos de propiedad en la frontera de Córdoba, Santa Fe y Buenos Aires a fines del siglo XIX

Directory of Open Access Journals (Sweden)

Tognetti, Luis Alberto

2010-01-01

Full Text Available En este trabajo analizamos la instauración de los derechos de propiedad sobre las tierras incorporadas por el avance de la frontera de 1869 en un espacio de contacto entre tres jurisdicciones provinciales. Con el objetivo de indagar cómo se resolvió la superposición de los intereses territoriales de Córdoba, Buenos Aires y Santa Fe, seguiremos la estrategia desarrollada por la primera de esas jurisdicciones, que definimos como una transacción incompleta. La perspectiva propuesta constituye un abordaje diferente respecto a la problemática del acceso a la propiedad en la frontera, que toma en cuenta el cambio institucional que significó el fortalecimiento del Estado nacional, con el consiguiente desarrollo de sus tres poderes: ejecutivo, legislativo y judicial. Cada uno de ellos tuvo a su cargo el control de las líneas de defensa y su desplazamiento; la sanción de las leyes que definieron los límites jurisdiccionales y los derechos de propiedad, público y privado, y la última instancia para dirimir los conflictos que surgieron en torno a esos derechos. El estudio se concentra sobre una zona de alta conflictividad, en la cual la definición de la propiedad demandó un largo proceso que se extendió desde 1875 hasta la última década del siglo XIX.In this paper we shall analyze the establishment of property rights on the land gained by advancing the frontier in 1869 and which was spread over an area where three provincial jurisdictions overlapped. We will describe the strategy used by one of the provinces – strategy defined as an incomplete transaction- in order to settle this conflict of interests among the provinces of Cordoba, Santa Fe and Buenos Aires. Our approach to the issue of property rights of border lands takes into account the institutional changes brought about by the strengthening of the Central Government and the development of the Executive, Legislative and Judicial powers. Each of these had a role in the control of

Three-dimensional geologic model of the southeastern Espanola Basin, Santa Fe County, New Mexico

Science.gov (United States)

Pantea, Michael P.; Hudson, Mark R.; Grauch, V.J.S.; Minor, Scott A.

2011-01-01

This multimedia model and report show and describe digital three-dimensional faulted surfaces and volumes of lithologic units that confine and constrain the basin-fill aquifers within the Espanola Basin of north-central New Mexico. These aquifers are the primary groundwater resource for the cities of Santa Fe and Espanola, six Pueblo nations, and the surrounding areas. The model presented in this report is a synthesis of geologic information that includes (1) aeromagnetic and gravity data and seismic cross sections; (2) lithologic descriptions, interpretations, and geophysical logs from selected drill holes; (3) geologic maps, geologic cross sections, and interpretations; and (4) mapped faults and interpreted faults from geophysical data. Modeled faults individually or collectively affect the continuity of the rocks that contain the basin aquifers; they also help define the form of this rift basin. Structure, trend, and dip data not previously published were added; these structures are derived from interpretations of geophysical information and recent field observations. Where possible, data were compared and validated and reflect the complex relations of structures in this part of the Rio Grande rift. This interactive geologic framework model can be used as a tool to visually explore and study geologic structures within the Espanola Basin, to show the connectivity of geologic units of high and low permeability between and across faults, and to show approximate dips of the lithologic units. The viewing software can be used to display other data and information, such as drill-hole data, within this geologic framework model in three-dimensional space.

Diversidad de aves en el Centro Agropecuario Cotové, Santa Fe de Antioquia, Colombia

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Caty Milena Martínez-Bravo

2013-12-01

Full Text Available En el Centro Agropecuario Cotové, en el municipio de Santa Fe de Antioquia (Colombia, se estudió la diversidad de aves utilizando las metodologías de puntos fijos de conteo y redes de niebla en cinco usos del suelo (Frutales, Sistema silvopastoril, Bosque secundario, Pastoreo con baja densidad de árboles y Pastos de corte, para analizar la influencia sobre la composición, riqueza y abundancia de la avifauna. Se registraron 6 633 individuos de 101 especies, de las cuales 11 especies son migratorias. En términos de abundancia, la mayoría de las especies fueron raras y pocas comunes. Los gremios alimenticios mejor representados fueron insectívoros y frugívoros. El índice de Shannon indica que el Sistema silvopastoril presenta los valores de diversidad alfa más altos y los frutales los más bajos. Los usos del suelo que compartieron más especies fueron sistema Silvopastoril y Pastoreo con baja densidad de árboles. La heterogeneidad ambiental del centro actúa de forma diferente para las especies, beneficia en su mayoría aves de baja y media especificidad de hábitat, y con preferencia de hábitats de borde y áreas abiertas, por lo que se deben implementar acciones de manejo dirigidas a la conservación de áreas de regeneración natural y conectividad entre usos del suelo, para que las poblaciones de especies de aves presentes en la zona puedan ser mantenidas en el tiempo.

Characterization of Newly Synthesized ZrFe2O5 Nanomaterial and Investigations of Its Tremendous Photocatalytic Properties under Visible Light Irradiation

Directory of Open Access Journals (Sweden)

Shaukat Ali Shahid

2013-01-01

Full Text Available High functional ZrFe2O5 nanoparticles were synthesized using coprecipitation technique. The chemical composition of nanomaterials was studied by energy-dispersive X-ray (EDX. To observe the morphology, field emission scanning electron microscopy (FE-SEM was used. X-ray diffraction (XRD technique was utilized to appraise the structure of the synthesized material. The photocatalytic behavior of ZrFe2O5 nano-particles was investigated by measuring the degradation rate of toluidine blue O (TBO dye in aqueous solution in the presence of ZrFe2O5 nano-particles under visible light irradiation. A steady decrease in absorption peak under visible light irradiation was observed by increasing exposure time. The degradation efficiency was observed as 92% after 140 min of exposure to visible light. Besides, ZrFe2O5 nanophotocatalyst could be recovered and recycled easily. The rate of TBO and total organic carbon (TOC removal under visible light irradiation decreased by only 5% and 10%, respectively, after seven cycles of use, demonstrating the high photostability of the synthesized nano-photocatalyst material.

Characterization of the emerald of Santa Terezinha de Goias by spectroscopy, fluorescence and X-ray difraction

International Nuclear Information System (INIS)

Lariucci, C.

1988-01-01

The purpose of this work is to characterize the emerald of Santa Terezinha de Goias-GO, according to their physical properties (refractive index and specific gravity); spectrographic (infrared, ultraviolet and visible absorption); electron paramagnetic resonance; chemical analysis; crystal structure and specially by the recognition of their mineral inclusions. The results of the refractive index measure for the emerald of Santa Terezinha de Goias-GO are n e (1.575-1.585) and n o (1.590-1.9600) and the birrefringence = 0.012; the specific gravity is between the highest of the world (2.745 (4) Mg. m -3 ). The near infrared and infrared absorption, show the presence, in the structural channels of the emerald, of gas carbonic and free water interacting with an ion (Fe and/or Na) in these channels. The ultraviolet and visible absorption spectra accused the presence of Cr 3+ replacing Al 3+ and Fe 3+ in the channels of the structure. The study of electron paramagnetic resonance confirmed these last results [pt

Genetic differentiation between marine iguanas from different breeding sites on the island of Santa Fe (Galapagos Archipelago).

Science.gov (United States)

Lanterbecq, Deborah; Glaberman, Scott; Vitousek, Maren Noelani; Steinfartz, Sebastian; Benavides, Edgar; Wikelski, Martin; Caccone, Adalgisa

2010-01-01

We studied patterns of genetic diversity within and among 5 populations (318 individuals) of Galápagos marine iguanas (Amblyrhynchus cristatus) from the island Santa Fé. Populations were separated by distances of 0.2 to 9.9 km. We sequenced 1182 base pairs of the mitochondrial control region and screened 13 microsatellite loci for variability. We also added data from 5 populations (397 individuals) sampled on 4 neighboring islands (Santa Cruz, Floreana, Espanola, and San Cristobal). The 5 Santa Fé populations, revealed as genetically distinct from populations on other islands, present relatively low levels of genetic diversity, which are similar for both microsatellite (average observed heterozygosity from 0.7686 to 0.7773) and mitochondrial DNA (mtDNA) markers (haplotypic and nucleotide diversity from 0.587 to 0.728 and from 0.00079 to 0.00293, respectively), and comparable with those observed in similar-sized sampling sites on other islands. There was frequency-based evidence of genetic structure between northern and southern sites on Santa Fé (F(st) of 0.0027-0.0115 for microsatellite and 0.0447-0.2391 for mtDNA), but the 4 southern sites showed little differentiation. Most of the intra-island genetic variation was allocated within rather than between sites. There was no evidence of sex-biased dispersal or population substructuring due to lek-mating behavior, suggesting that these 2 observed behaviors are not strong enough to leave an evolutionary signal on genetic patterns in this species.

Preparation of Fe-doped TiO{sub 2} nanotube arrays and their photocatalytic activities under visible light

Energy Technology Data Exchange (ETDEWEB)

Tu, Ya-Fang; Huang, Sheng-You [Department of Physics, Wuhan University, Wuhan 430072 (China); Sang, Jian-Ping, E-mail: jpsang@acc-lab.whu.edu.cn [Department of Physics, Wuhan University, Wuhan 430072 (China); Department of Physics, Jianghan University, Wuhan 430056 (China); Zou, Xian-Wu [Department of Physics, Wuhan University, Wuhan 430072 (China)

2010-02-15

Fe-doped TiO{sub 2} nanotube arrays have been prepared by the template-based liquid phase deposition method. Their morphologies, structures and optical properties were investigated by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and UV-vis absorption spectroscopy. Their photocatalytic activities were evaluated by the degradation of methylene blue under visible light. The UV-vis absorption spectra of the Fe-doped TiO{sub 2} nanotube arrays showed a red shift and an enhancement of the absorption in the visible region compared to the undoped sample. The Fe-doped TiO{sub 2} nanotube arrays exhibited good photocatalytic activities under visible light irradiation, and the optimum dopant amount was found to be 5.9 at% in our experiments.

Synthesis of ZnFe2O4/ZnO nanocomposites immobilized on graphene with enhanced photocatalytic activity under solar light irradiation

International Nuclear Information System (INIS)

Sun, Lin; Shao, Rong; Tang, Lanqin; Chen, Zhidong

2013-01-01

Highlights: ► ZnFe 2 O 4 /ZnO nanocomposites immobilized on graphene were successfully prepared. ► The photocatalyst exhibited excellent reactivity under solar light irradiation. ► The photocatalysts could be recycled by external magnetic field conveniently. ► The photocatalytic mechanism of the novel material was proposed in detail. -- Abstract: Magnetically recyclable ZnFe 2 O 4 /ZnO nanocomposites immobilized on different content of graphene with favorable photocatalytic activity under solar light irradiation were successfully prepared on the basis of an ultrasound aided solution method. The molar ratio of ZnFe 2 O 4 to ZnO and the content of graphene could be controlled by adjusting the amount of zinc salts and graphene oxide dispersions. The most excellent photocatalytic activity under solar light irradiation was displayed when the molar ratio of ZnFe 2 O 4 to ZnO was 0.1 and the weight ratio of graphene to ZnFe 2 O 4 /ZnO was 0.04. Furthermore, the presence of magnetical ZnFe 2 O 4 will facilitate the recycling process of photocatalyst nanoparticles

The occupational health of Santa Claus

OpenAIRE

Straube, Sebastian; Fan, Xiangning

2015-01-01

Previous publications in the field of Santa studies have not focused on health and safety issues arising from Santa?s workplace activities. However, it should be acknowledged that unique occupational hazards exist for Santa Claus. Major occupational health issues affecting Santa are discussed, along with suggestions for future research directions.

Aerial gamma ray and magnetic survey: Raton Basin Project. The Raton and Santa Fe Quadrangles of New Mexico. Final report

International Nuclear Information System (INIS)

1979-11-01

In 1978, EG and G geoMetrics collected 4955 line miles of high sensitivity airborne radiometric and magnetic data in New Mexico within the Raton and Santa Fe quadrangles. These quadrangles represent part of the Raton Basin Project. All radiometric and magnetic data for the two quadrangles were fully reduced and interpreted by geoMetrics, and are presented as three volumes; one Volume I covering both quadrangles and separate Volume II's for the individual quadrangles. Over 50% of the survey area is covered by flat lying Mesozoic and Cenozoic deposits of the southern Great Plains Province. The western and southern portions of the area contain a combination of Precambrian and Paleozoic igneous and metamorphic rocks. These rocks occur primarily within and in close proximity to the Sangre de Cristo Mountains and late Cenozoic volcanic deposits occur to the west of the mountains and in the Las Vegas Volcanic region. Uranium deposits are scattered throughout the region, but none are known to be economic at the time of this report

Low-Light Anoxygenic Photosynthesis and Fe-S-Biogeochemistry in a Microbial Mat.

Science.gov (United States)

Haas, Sebastian; de Beer, Dirk; Klatt, Judith M; Fink, Artur; Rench, Rebecca McCauley; Hamilton, Trinity L; Meyer, Volker; Kakuk, Brian; Macalady, Jennifer L

2018-01-01

We report extremely low-light-adapted anoxygenic photosynthesis in a thick microbial mat in Magical Blue Hole, Abaco Island, The Bahamas. Sulfur cycling was reduced by iron oxides and organic carbon limitation. The mat grows below the halocline/oxycline at 30 m depth on the walls of the flooded sinkhole. In situ irradiance at the mat surface on a sunny December day was between 0.021 and 0.084 μmol photons m -2 s -1 , and UV light (97% sequence identity) of clones affiliated with Prosthecochloris , a genus within the green sulfur bacteria (GSB), which are obligate anoxygenic phototrophs. Typical photopigments of brown-colored GSB, bacteriochlorophyll e and (β-)isorenieratene, were abundant in mat samples and their absorption properties are well-adapted to harvest light in the available green and possibly even UV-A spectra. Sulfide from the water column (3-6 μmol L -1 ) was the main source of sulfide to the mat as sulfate reduction rates in the mats were very low (undetectable-99.2 nmol cm -3 d -1 ). The anoxic water column was oligotrophic and low in dissolved organic carbon (175-228 μmol L -1 ). High concentrations of pyrite (FeS 2 ; 1-47 μmol cm -3 ) together with low microbial process rates (sulfate reduction, CO 2 fixation) indicate that the mats function as net sulfide sinks mainly by abiotic processes. We suggest that abundant Fe(III) (4.3-22.2 μmol cm -3 ) is the major source of oxidizing power in the mat, and that abiotic Fe-S-reactions play the main role in pyrite formation. Limitation of sulfate reduction by low organic carbon availability along with the presence of abundant sulfide-scavenging iron oxides considerably slowed down sulfur cycling in these mats.

A practical pathway for the preparation of Fe{sub 2}O{sub 3} decorated TiO{sub 2} photocatalyst with enhanced visible-light photoactivity

Energy Technology Data Exchange (ETDEWEB)

Cheng, Li; Qiu, Shoufei [Institute of Polymer Materials, School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013 (China); Chen, Juanrong, E-mail: Juanrongchen@ujs.edu.cn [School of Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013 (China); Shao, Jian [Institute of Polymer Materials, School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013 (China); Cao, Shunsheng, E-mail: sscaochem@hotmail.com [Institute of Polymer Materials, School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013 (China)

2017-04-01

Shifting the ultra-violet of titania to visible light driven photocatalysis can be realized by coupling with metallic or non-metallic elements. However, time-consuming multi-step process and significant loss of UV photocatalytic activity of such TiO{sub 2}-based photocatalysts severely hinder their practical applications. In this work, we explore the idea of creating a practical method for the preparation of Fe{sub 2}O{sub 3} decorated TiO{sub 2} (TiO{sub 2}/Fe{sub 2}O{sub 3}) photocatalyst with controlled visible-light photoactivity. This method only involves the calcination of the mixture (commercial P25 powders and magnetic Fe{sub 3}O{sub 4} nanoparticles) prepared by a mechanical process. The morphology and properties of TiO{sub 2}/Fe{sub 2}O{sub 3} composites were characterized by Transmission electron microscope, X-ray diffraction, UV–vis spectroscopy, and X-ray photoelectron spectroscopy. Results confirm the fusion of TiO{sub 2} and Fe{sub 2}O{sub 3}, which promotes photo-generated electrons/holes migration and separation. Because of the strong synergistic effect, the as-synthesized TiO{sub 2}/Fe{sub 2}O{sub 3} composites manifest an enhanced visible-light photocatalytic activity. Especially, the TiO{sub 2}/Fe{sub 2}O{sub 3} photocatalyst is very easy to be constructed via an one-step protocol that efficiently overcomes the time-consuming multi-step processes used in existed strategies for the preparation of Fe{sub 2}O{sub 3}/TiO{sub 2} photocatalysts, providing a new insight into the practical application of TiO{sub 2}/Fe{sub 2}O{sub 3} visible light photocatalyst. - Highlights: • We introduced a practical preparation of Fe{sub 2}O{sub 3} decorated TiO{sub 2} photocatalyst. • TiO{sub 2}/Fe{sub 2}O{sub 3} was developed using commercial precursors in a high efficient manner. • Visible-light activity of TiO{sub 2}/Fe{sub 2}O{sub 3} could be tuned by changing amount of Fe{sub 3}O{sub 4} precursor. • TiO{sub 2}/Fe{sub 2}O{sub 3} exhibited a higher

Electrospinning direct preparation of SnO2/Fe2O3 heterojunction nanotubes as an efficient visible-light photocatalyst

International Nuclear Information System (INIS)

Zhu, Chengquan; Li, Yuren; Su, Qing; Lu, Bingan; Pan, Jiaqi; Zhang, Jiawang; Xie, Erqing; Lan, Wei

2013-01-01

Highlights: •SnO 2 /Fe 2 O 3 nano-heterojunction-tubes are prepared by a facile electrospinning technique. •The formation mechanism of heterojunction tubes is proposed for self-polymer-templates action. •SnO 2 /Fe 2 O 3 nano-heterojunction-tubes show high photocatalytic activity under visible light irradiation. •The reasons for the high photocatalytic activity are investigated in detail. -- Abstract: Herein SnO 2 /Fe 2 O 3 heterojunction nanotubes are prepared by a facile electrospinning technique. The heterojunction nanotubes with a diameter of about 200 nm uniformly distribute SnO 2 and Fe 2 O 3 nanocrystals and present the obvious interfaces between them, which form perfect SnO 2 /Fe 2 O 3 nano-heterojunctions. A possible mechanism based on self-polymer-templates is proposed to explain the formation of SnO 2 /Fe 2 O 3 heterojunction nanotubes. The heterojunction nanotubes show high photocatalytic activity for the degradation of RhB dye under visible light irradiation. The prepared SnO 2 /Fe 2 O 3 heterojunction nanotubes can also be applied to other fields such as sensor, lithium-ion batteries

Photocatalytic degradation of methylene blue on magnetically separable MgFe2O4 under visible light irradiation

International Nuclear Information System (INIS)

Shahid, Muhammad; Jingling, Liu; Ali, Zahid; Shakir, Imran; Warsi, Muhammad Farooq; Parveen, Riffat; Nadeem, Muhammad

2013-01-01

A magnetically separable single-phase MgFe 2 O 4 photocatalyst with a spinel crystal structure was synthesized by using the solid-state reaction method. The formation of spinel structure is confirmed by X-ray diffraction and Fourier transform infrared spectroscopy. The magnetic measurements showed that the photocatalyst material can be separated from water when an external magnetic field is added and redispersed into water solution after the external magnetic field is eliminated. It is one of the promising photocatalysts for waste water treatment. The photocatalytic activity of MgFe 2 O 4 was investigated by using the photo-decomposition of methylene blue dye under visible light. The photoelectrochemical property of the MgFe 2 O 4 was studied by measuring their photocurrent–potential behavior in 1 M NaOH electrolyte under AM 1.5100 mW cm −2 illumination. - Graphical abstract: Highly efficient magnetically separable MgFe 2 O 4 photocatalyst for organic based impurities decomposition as well as for the production of H 2 gas was synthesized and characterized successfully (a) MgFe 2 O 4 photocatalyst in polluted water, (b) The photocatalyst (MgFe 2 O 4 ) is being attracted toward magnetic field for separation, (c) Hysteresis loop of MgFe 2 O 4 showing magnetic behavior. Highlights: ► New photocatalyst working in the visible range have been synthesized by facile cheap route. ► MgFe 2 O 4 photocatalyst showed well defined magnetically separable behavior. ► Excellent water splitting characteristics to produce H 2 was observed under visible light irradiation

Enhanced visible-light-response photocatalytic degradation of methylene blue on Fe-loaded BiVO{sub 4} photocatalyst

Energy Technology Data Exchange (ETDEWEB)

Chala, Sinaporn [Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200 (Thailand); Wetchakun, Khatcharin [Program of Physics, Faculty of Science, Ubon Ratchathani Rajabhat University, Ubon Ratchathani 34000 (Thailand); Phanichphant, Sukon [Materials Science Research Centre, Faculty of Science, Chiang Mai University, Chiang Mai 50200 (Thailand); Inceesungvorn, Burapat [Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200 (Thailand); Wetchakun, Natda, E-mail: natda_we@yahoo.com [Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200 (Thailand)

2014-06-01

Highlights: • Fe-loaded BiVO{sub 4} particles were prepared by hydrothermal method. • Physicochemical properties played a significant role in photocatalytic process. • All Fe-loaded BiVO{sub 4} samples showed higher photocatalytic activity than pure BiVO{sub 4}. • The Fe{sup 3+} ions may improve the separation of photogenerated electrons and holes. - Abstract: Pure BiVO{sub 4} and nominal 0.5–5.0 mol% Fe-loaded BiVO{sub 4} samples were synthesized by hydrothermal method. All samples were characterized in order to obtain the correlation between structure and photocatalytic properties by X-ray diffraction, Brunauer, Emmett and Teller, UV–vis diffuse reflectance spectrophotometry, photoluminescence spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and inductively coupled plasma-optical emission spectroscopy. The structure of all samples was single-phase monoclinic scheelite. The absorption spectrum of 5.0 mol% Fe-loaded BiVO{sub 4} shifted to the visible region, suggesting the potential application of this material as a superior visible-light driven photocatalyst in comparison with pure BiVO{sub 4}. Photocatalytic activities of all photocatalyst samples were examined by studying the degradation of methylene blue under visible light irradiation. The results clearly showed that Fe-loaded BiVO{sub 4} sample exhibited remarkably higher activity than pure BiVO{sub 4}.

Low-Light Anoxygenic Photosynthesis and Fe-S-Biogeochemistry in a Microbial Mat

Directory of Open Access Journals (Sweden)

Sebastian Haas

2018-04-01

Full Text Available We report extremely low-light-adapted anoxygenic photosynthesis in a thick microbial mat in Magical Blue Hole, Abaco Island, The Bahamas. Sulfur cycling was reduced by iron oxides and organic carbon limitation. The mat grows below the halocline/oxycline at 30 m depth on the walls of the flooded sinkhole. In situ irradiance at the mat surface on a sunny December day was between 0.021 and 0.084 μmol photons m-2 s-1, and UV light (<400 nm was the most abundant part of the spectrum followed by green wavelengths (475–530 nm. We measured a light-dependent carbon uptake rate of 14.5 nmol C cm-2 d-1. A 16S rRNA clone library of the green surface mat layer was dominated (74% by a cluster (>97% sequence identity of clones affiliated with Prosthecochloris, a genus within the green sulfur bacteria (GSB, which are obligate anoxygenic phototrophs. Typical photopigments of brown-colored GSB, bacteriochlorophyll e and (β-isorenieratene, were abundant in mat samples and their absorption properties are well-adapted to harvest light in the available green and possibly even UV-A spectra. Sulfide from the water column (3–6 μmol L-1 was the main source of sulfide to the mat as sulfate reduction rates in the mats were very low (undetectable-99.2 nmol cm-3 d-1. The anoxic water column was oligotrophic and low in dissolved organic carbon (175–228 μmol L-1. High concentrations of pyrite (FeS2; 1–47 μmol cm-3 together with low microbial process rates (sulfate reduction, CO2 fixation indicate that the mats function as net sulfide sinks mainly by abiotic processes. We suggest that abundant Fe(III (4.3–22.2 μmol cm-3 is the major source of oxidizing power in the mat, and that abiotic Fe-S-reactions play the main role in pyrite formation. Limitation of sulfate reduction by low organic carbon availability along with the presence of abundant sulfide-scavenging iron oxides considerably slowed down sulfur cycling in these mats.

Moluscos asociados a las raíces sumergidas del mangle rojo Rhizophora mangle, en el Golfo de Santa Fe, Estado Sucre, Venezuela

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B. Márquez

2002-12-01

Full Text Available Se realizó un estudio mensual cualitativo y cuantitativo de la comunidad de moluscos asociados a las raíces sumergidas del mangle rojo, Rhizophora mangle, entre octubre de 1998 y septiembre de 1999, en seis estaciones del Golfo de Santa Fe (Estado Sucre, Venezuela. Se colectaron e identificaron un total de 4 704 individuos pertenecientes a 45 especies de moluscos (22 gasterópodos, 15 bivalvos y 8 polyplacóforos. Las especies más abundantes fueron: Crassostrea rhizophorae, Isognomon bicolor L alatus y Brachidontes exustus. Los valores más altos de diversidad y equitabilidad, y los menores valores de dominancia, se encontraron en las estaciones tres y cuatro, mientras que lo opuesto ocurrió en las estaciones uno y dos. El análisis de afinidad mostró que en las cinco primeras estaciones las variaciones espaciales en la composición de la comunidad son mayores que las variaciones temporales, mientras que en la estación seis priman las diferencias temporales. Se encontraron factores que podrían ser importantes para determinar la estructura de la comunidad, como vecindad a otros ecosistemas y/6 aspectos biológicos específicos de las especies como adaptaciones a condiciones fluctuantes, hábitos alimenticios y migración en busca de ambientes sombreados y protegidos.A qualitative and quantitative monthly study of the mollusks community associated to the submered roots of the red mangrove, Rhizophora mangle (L., between October of 1998 and September of 1999, in six stations of the Gulf of Santa Fe. (Suere State, Venezuela. Were collected 4 704 specimens, 45 species of mollusks were identified (22 gastropods, 15 bivalves and 8 chitons. The most abundant species were: Crassostrea rhizophorae, Isognomon bicolor, L alatus and Brachidontes exustus. The highest values in diversity and evenness, and the smallest dominant values, were in the stations three and four, while the opposed happened in the stations one and two. The analysis of likeness

Light-driven dinitrogen reduction catalyzed by a CdS:nitrogenase MoFe protein biohybrid

Energy Technology Data Exchange (ETDEWEB)

Brown, K. A.; Harris, D. F.; Wilker, M. B.; Rasmussen, A.; Khadka, N.; Hamby, H.; Keable, S.; Dukovic, G.; Peters, J. W.; Seefeldt, L. C.; King, P. W.

2016-04-21

The splitting of dinitrogen (N2) and reduction to ammonia (NH3) is a kinetically complex and energetically challenging multistep reaction. In the Haber-Bosch process, N2 reduction is accomplished at high temperature and pressure, whereas N2 fixation by the enzyme nitrogenase occurs under ambient conditions using chemical energy from adenosine 5'-triphosphate (ATP) hydrolysis. We show that cadmium sulfide (CdS) nanocrystals can be used to photosensitize the nitrogenase molybdenum-iron (MoFe) protein, where light harvesting replaces ATP hydrolysis to drive the enzymatic reduction of N2 into NH3. The turnover rate was 75 per minute, 63% of the ATP-coupled reaction rate for the nitrogenase complex under optimal conditions. Inhibitors of nitrogenase (i.e., acetylene, carbon monoxide, and dihydrogen) suppressed N2 reduction. The CdS:MoFe protein biohybrids provide a photochemical model for achieving light-driven N2 reduction to NH3.

Cuidado y Protección. Las Medidas de Protección de Derechos en la Provincia de Santa Fe, Argentina.

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Silvina Laura Fernández

2016-04-01

Full Text Available Resumo: As adaptações normativas dos países á Convenção Internacional sobre os direitos da criança (1990 foram suscitando debates, controvérsias e ensaios entre os atores sociais, políticos e judiciários sob como tornar consistentes as mudanças propostas. Este artigo tem o objetivo de contribuir a expor as racionalidades, tensões e disputas entre os atores do campo da criança e do adolescente sob as medidas excepcionais estabelecidas pela lei de proteção integral a criança e ao adolescente no Estado de Santa Fe, Argentina (No 12927/09 Tais medidas têm revertidos nos procedimentos no qual se decreta a perda o suspensão do poder familiar. No caso da pesquisa e no analise dos depoimentos coletados, o estudo reconstrói os argumentos que guiaram o tema tanto no grupo de pais adotantes como no Foro de Infâncias Rosário nos primeiros anos do Sistema de Proteção de Direitos no Estado. Assim, o cuidado torna se hoje uma categoria privilegiada a fim de objetivar os diferentes argumentos sobre as responsabilidades sociais e da família em relação à minoria de idade nos processo administrativos e judiciários. O estudo nota seu ponto de condensação na transformação normativa do ano 2011. Palavras-chave: Infância; Políticas; Proteção; Direitos; Cuidado *** Resumen: Las adecuaciones normativas de los países a la Convención Internacional sobre los Derechos del Niño (1989 fueron suscitando  interrogantes, controversias y ensayos entre los actores sociales, políticos y judiciales sobre cómo tornar consistentes las transformaciones propuestas. El artículo tiene como objeto exponer las racionalidades, tensiones y disputas entre los actores del campo de la infancia sobre las medidas excepcionales establecidas por la ley de protección de derechos de niñas, niños y adolescentes en la provincia de Santa Fe, Argentina (N°12.927/09. Dichas medidas consisten en el proceso burocrático a través del cual un infante es separado

Bactericidal effect of blue LED light irradiated TiO{sub 2}/Fe{sub 3}O{sub 4} particles on fish pathogen in seawater

Energy Technology Data Exchange (ETDEWEB)

Cheng, T.C. [Department of Tropical Agriculture and International Cooperation, National Pingtung University of Science and Technology, Taiwan (China); Yao, K.S. [Department of Horticulture, National Taitung Junior College, Taiwan (China); Yeh, N. [Mingdao University, Taiwan (China); Chang, C.I. [Aquaculture Division, Fisheries Research Institute, Council of Agriculture, Taiwan (China); Hsu, H.C. [Department of Life Science, Mingdao University, Taiwan (China); Gonzalez, F. [Department of Tropical Agriculture and International Cooperation, National Pingtung University of Science and Technology, Taiwan (China); Chang, C.Y., E-mail: cyc1136@yahoo.com.tw [Center of General Education, National Taitung Junior College, Taiwan (China)

2011-05-31

This study uses blue LED light ({lambda}{sub max} = 475 nm) activated TiO{sub 2}/Fe{sub 3}O{sub 4} particles to evaluate the particles' photocatalytic activity efficiency and bactericidal effects in seawater of variable salinities. Different TiO{sub 2} to Fe{sub 3}O{sub 4} mole ratios have been synthesized using sol-gel method. The synthesized particles contain mainly anatase TiO{sub 2}, Fe{sub 3}O{sub 4} and FeTiO{sub 3}. The study has identified TiO{sub 2}/Fe{sub 3}O{sub 4}'s bactericidal effect to marine fish pathogen (Photobacterium damselae subsp. piscicida BCRC17065) in seawater. The SEM photo reveals the surface destruction in bacteria incubated with blue LED irradiated TiO{sub 2}/Fe{sub 3}O{sub 4}. The result of this study indicates that 1) TiO{sub 2}/Fe{sub 3}O{sub 4} acquires photocatalytic activities in both the freshwater and the seawater via blue LED irradiation, 2) higher photocatalytic activities appear in solutions of higher TiO{sub 2}/Fe{sub 3}O{sub 4} mole ratio, and 3) photocatalytic activity decreases as salinity increases. These results suggest that the energy saving blue LED light is a feasible light source to activate TiO{sub 2}/Fe{sub 3}O{sub 4} photocatalytic activities in both freshwater and seawater.

PUENTES ENTRE LA EXTENSIÓN, LA INVESTIGACIÓN Y LA CIUDADANÍA SEXUAL: EL CASO DEL MONITOREO SOCIAL DE POLÍTICAS PÚBLICAS EN SALUD SEXUAL Y REPRODUCTIVA EN LA PROVINCIA DE SANTA FE

OpenAIRE

Pagura, Fernanda; Molina, Adriana; Cánaves, Violeta; Trevisi, Maica

2011-01-01

En un trabajo articulado y sostenido en el tiempo desde el año 2006 entre el Programa de Extensión “Género, Sociedad y Universidad perteneciente a la Universidad Nacional del Litoral y Organizaciones de la sociedad civil de la provincia de Santa Fe, se han generado diferentes acciones a partir de un objetivo común: monitorear la plena aplicabilidad de la Ley 11.888 (Programa provincial de salud reproductiva y procreación responsable) y la accesibilidad en igualdad de condiciones de parte de l...

Synergistic effect of surface self-doping and Fe species-grafting for enhanced photocatalytic activity of TiO{sub 2} under visible-light

Energy Technology Data Exchange (ETDEWEB)

Kong, Lina [Center for Advanced Optoelectronic Functional Materials Research, Key Laboratory of UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, 5268 Renmin Street, Changchun 130024 (China); Institute of Material Physics, Key Laboratory of Display Materials and Photoelectric Devices of Ministry of Education, Tianjin University of Technology, Tianjin 300384 (China); Wang, Changhua; Wan, Fangxu; Zheng, Han [Center for Advanced Optoelectronic Functional Materials Research, Key Laboratory of UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, 5268 Renmin Street, Changchun 130024 (China); Zhang, Xintong, E-mail: xtzhang@nenu.edu.cn [Center for Advanced Optoelectronic Functional Materials Research, Key Laboratory of UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, 5268 Renmin Street, Changchun 130024 (China)

2017-02-28

Highlights: • Anatase TiO{sub 2} was modified with Fe-ethoxide through wet impregnation method. • XPS and EPR investigation supported the formation of Vo and Fe species. • Vo improved the optical absorption properties to a larger extent. • Fe species inhibited the charge carrier recombination process. • Synergism between Vo and Fe species enhanced the photocatalytic activity. - Abstract: Surface grafting of transition-metal complexes or oxides is an appealing way to enhance the photocatalytic activity of TiO{sub 2} under visible-light excitation. However, the performance of these co-catalysts assistant TiO{sub 2} photocatalysts is still not sufficient enough due to their relatively weak visible-light absorption. Herein, we report a simple impregnation treatment with ferric ethoxide/ethanol solvent, followed with mild heating which can significantly enhance the visible-light absorption and photocatalytic activity of TiO{sub 2}. XPS and EPR analyses manifest that the oxygen vacancies (V{sub O}s) and Fe-species are simultaneously introduced to the surface of TiO{sub 2}. The chemical state and photocatalytic activity of the Fe-species-grafted TiO{sub 2−x} is dependent on the heating temperature after impregnation. The sample heat-treated at 250 °C exhibits the optimal photocatalytic performance for β-naphthol degradation with rate constant 6.0, 2.7, and 3.9 times higher than that of TiO{sub 2}, TiO{sub 2−x}, and Fe-TiO{sub 2}, respectively. The activity enhancement is discussed on the basis of the synergistic effect and energy-level matching of surface V{sub O}s and Fe-species co-catalyst, i.e. the V{sub O}s defects states increase the visible-light absorption and the Fe-species in the form of FeOOH promote the consumption of photo-generated electrons through multi-electron reduction of adsorbed molecule oxygen.

Light-driven dinitrogen reduction catalyzed by a CdS:nitrogenase MoFe protein biohybrid.

Science.gov (United States)

Brown, Katherine A; Harris, Derek F; Wilker, Molly B; Rasmussen, Andrew; Khadka, Nimesh; Hamby, Hayden; Keable, Stephen; Dukovic, Gordana; Peters, John W; Seefeldt, Lance C; King, Paul W

2016-04-22

The splitting of dinitrogen (N2) and reduction to ammonia (NH3) is a kinetically complex and energetically challenging multistep reaction. In the Haber-Bosch process, N2 reduction is accomplished at high temperature and pressure, whereas N2 fixation by the enzyme nitrogenase occurs under ambient conditions using chemical energy from adenosine 5'-triphosphate (ATP) hydrolysis. We show that cadmium sulfide (CdS) nanocrystals can be used to photosensitize the nitrogenase molybdenum-iron (MoFe) protein, where light harvesting replaces ATP hydrolysis to drive the enzymatic reduction of N2 into NH3 The turnover rate was 75 per minute, 63% of the ATP-coupled reaction rate for the nitrogenase complex under optimal conditions. Inhibitors of nitrogenase (i.e., acetylene, carbon monoxide, and dihydrogen) suppressed N2 reduction. The CdS:MoFe protein biohybrids provide a photochemical model for achieving light-driven N2 reduction to NH3. Copyright © 2016, American Association for the Advancement of Science.

Strength of "Light" Ferritic and Austenitic Steels Based on the Fe - Mn - Al - C System

Science.gov (United States)

Kaputkina, L. M.; Svyazhin, A. G.; Smarygina, I. V.; Kindop, V. E.

2017-01-01

The phase composition, the hardness, the mechanical properties at room temperature, and the resistance to hot (950 - 1000°C) and warm (550°C) deformation are studied for cast deformable "light" ferritic and austenitic steels of the Fe - (12 - 25)% Mn - (0 - 15)% Al - (0 - 2)% C system alloyed additionally with about 5% Ni. The high-aluminum high-manganese low-carbon and carbonless ferritic steels at a temperature of about 0.5 T melt have a specific strength close to that of the austenitic steels and may be used as weldable scale-resistant and wear-resistant materials. The high-carbon Fe - (20 - 24)% Mn - (5 - 9)% Al - 5% Ni - 1.5% C austenitic steels may be applied as light high-strength materials operating at cryogenic temperatures after a solution treatment and as scale- and heat-resistant materials in an aged condition.

Distribución de serotipos de Streptococcus pneumoniae aislados de infecciones invasoras en el Hospital de Niños de Santa Fe Serotype distribution of Streptococcus pneumoniae isolated from invasive infections at the Hospital de Niños of Santa Fe.

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C. Mayoral

2008-03-01

Full Text Available Con la introducción de vacunas conjugadas antineumocócicas se observó, en muchos países, disminución de aislamientos de Streptococcus pneumoniae del serotipo 14 y aumento de aislamientos correspondientes a serotipos no incluidos en esas vacunas. En 1993, el Hospital de Niños de Santa Fe comenzó la vigilancia de la distribución de serotipos de Streptococcus pneumoniae invasores. En este trabajo se estudió la correlación entre serotipo y a patología (neumonía/meningitis, b edad (menor o mayor de dos años, y c CIM de penicilina, para los serotipos aislados en el período 2003-2005. El serotipo predominante fue el 14, seguido del 1, 6B, 18C, 7F, 19F y 5. El serotipo 14 mostró asociación estadísticamente significativa con valores de CIM de penicilina entre 0,5 y 2 mg/l, no así con alguna patología, aunque se lo halló con mayor frecuencia en neumonías que en meningitis. Los serotipos 14 y 1 prevalecieron en niños menores y mayores de 2 años, respectivamente. La CIM de penicilina = 2 mg/l se observó más en neumonías que en meningitis. La frecuencia relativa de los diferentes serotipos hallados fue semejante a la observada en el período 1993-99; no obstante, los serotipos 18C, 4, 12F y 22F no se habían encontrado antes. La aparición de nuevos serotipos convierte en importante la vigilancia, dada la necesidad de formular vacunas que los incluyan y que efectivamente prevengan las infecciones neumocócicas más comunes.The serotype distribution of Streptococcus pneumoniae varies through time. The introduction of pneumococcal conjugate vaccines showed a decreased prevalence of pneumococcal invasive isolates belonging to serotype 14 and an increase of serotypes not therein included. In 1993, the Hospital de Niños of Santa Fe began surveillance of the serotype distribution of invasive S. pneumoniae disease. In the period 2003 - 2005, 76 isolates were analysed by studying the correlation between serotype and pathology, age and MIC

Enhanced visible-light-induced photocatalytic activity of α-Fe2O3 adsorbing redox enzymes

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Kai Kamada

2015-03-01

Full Text Available We report fabrication of hybrid photocatalyst composed of an n-type semiconductor (α-Fe2O3 and a redox enzyme (horseradish peroxidase; HRP, and its performance for oxidation of luminol in an aqueous solution. The hybrid photocatalyst is simply formed via physical adsorption of HRP to an α-Fe2O3 sintered body. Under visible light irradiation, the bare α-Fe2O3 with a narrow bandgap photocatalytically oxidizes luminol along with blue emission that can be used as an indicator of the photocatalytic performance. The blue emission is largely strengthened after the adsorption of HRP, demonstrating that the presence of enzyme improves apparent photocatalytic activity of α-Fe2O3. The favorable effect is derived from synergistic oxidation of luminol by the biocatalysts (HRP as well as by the photocatalyst (α-Fe2O3. In this paper, influence of excitation wavelength, adsorption amount of HRP, and reaction temperature on the overall photocatalytic activity are elucidated, and then a reaction mechanism of the proposed novel hybrid photocatalyst is discussed in detail.

78 FR 64909 - Southwestern Region: Invasive Plant Control Project, Carson and Santa Fe National Forests, New...

Science.gov (United States)

2013-10-30

... the following instructions: (1) Complete the analysis of effects on the Management Indicator Species... forest: Carson Forest Supervisor's Office, 208 Cruz Alta Road, Taos, NM 87571, Attn: Planning; or Santa... and each will prepare a separate record of decision. Importance of Public Participation in Subsequent...

Enhanced photocatalytic performances and magnetic recovery capacity of visible-light-driven Z-scheme ZnFe2O4/AgBr/Ag photocatalyst

Science.gov (United States)

He, Jie; Cheng, Yahui; Wang, Tianzhao; Feng, Deqiang; Zheng, Lingcheng; Shao, Dawei; Wang, Weichao; Wang, Weihua; Lu, Feng; Dong, Hong; Zheng, Rongkun; Liu, Hui

2018-05-01

High efficiency, high stability and easy recovery are three key factors for practical photocatalysts. Z-scheme heterostructure is one of the most promising photocatalytic systems to meet all above requirements. However, efficient Z-scheme photocatalysts which could absorb visible light are still few and difficult to implement at present. In this work, the composite photocatalysts ZnFe2O4/AgBr/Ag were prepared through a two-step method. A ∼92% photodegradation rate on methyl orange was observed within 30 min under visible light, which is much better than that of individual ZnFe2O4 or AgBr/Ag. The stability was also greatly improved compared with AgBr/Ag. The increased performance is resulted from the suitable band alignment of ZnFe2O4 and AgBr, and it is defined as Z-scheme mechanism which was demonstrated by detecting active species and electrochemical impedance spectroscopy. Besides, ZnFe2O4/AgBr/Ag is ferromagnetic and can be recycled by magnet. These results show that ZnFe2O4/AgBr/Ag is a potential magnetically recyclable photocatalyst which can be driven by visible light.

Magnetically separable Cu{sub 2}O/chitosan–Fe{sub 3}O{sub 4} nanocomposites: Preparation, characterization and visible-light photocatalytic performance

Energy Technology Data Exchange (ETDEWEB)

Cao, Chunhua [School of Resource and Environmental Science, Wuhan University, Wuhan 430072 (China); Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, College of Chemical and Environmental Engineering, Jianghan University, Wuhan 430056 (China); Xiao, Ling, E-mail: xiaoling9119@whu.edu.cn [School of Resource and Environmental Science, Wuhan University, Wuhan 430072 (China); Chen, Chunhua [Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, College of Chemical and Environmental Engineering, Jianghan University, Wuhan 430056 (China); Cao, Qihua [School of Resource and Environmental Science, Wuhan University, Wuhan 430072 (China)

2015-04-01

Highlights: • A novel magnetically-separable Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} photocatalyst was in situ prepared. • Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} NCs had rough and porous chitosan surface layer embedded with Fe{sub 3}O{sub 4} NPs. • Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} NCs showed large surface areas and special dimodal pore structure. • Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} NCs showed superparamagnetism and could be easily magnetic separated. • Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} NCs exhibited good visible-light photocatalytic activity and stability. - Abstract: A novel magnetically-separable visible-light-induced photocatalyst, Cu{sub 2}O/chitosan–Fe{sub 3}O{sub 4} nanocomposite (Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} NC), was prepared via a facile one-step precipitation–reduction process by using magnetic chitosan chelating copper ions as precursor. The structure and properties of Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} NCs were characterized by XRD, FT-IR, SEM, HRTEM, SAED, EDS, BET, VSM, XPS and UV–vis/DRS. The photocatalytic activity of Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} NCs was evaluated by decolorization of reactive brilliant red X-3B (X-3B) under visible light irradiation. The characterization results indicated that Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} NCs exhibited relatively large specific surface areas and special dimodal pore structure because Cu{sub 2}O was wrapped in chitosan matrix embedded with Fe{sub 3}O{sub 4} nanoparticles. The tight combination of magnetic Fe{sub 3}O{sub 4} and semiconductor Cu{sub 2}O through chitosan made the nanocomposites show good superparamagnetism and photocatalytic activity. It was found that X-3B could be decolorized more efficiently in acidic media than in neutral or alkaline media. The decolorization of X-3B was ascribed to the synergistic effect of photocatalysis and adsorption. Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} NCs could be easily separated from the solution by an external magnet, and the decolorization rates of X-3B

Mumps in a district primary school at the locality of Santa Fe, Bogota (Colombia 2010.

Directory of Open Access Journals (Sweden)

Oneida Castañeda

2010-12-01

Full Text Available Background. Epidemic parotitis (“mumps” is a human viral infection which affects mainly the salivary glands; its peak incidence afflicts children 5 to 9-year. At epidemiologic week (EW 40/2010, the Centro Oriente II Level Hospital received a community report about a mumps outbreak in a District Primary School (DPS, eastwards of the locality of Santa Fe (Bogotá. The hospital’s epidemiology office sent a response team to investigate the situation and to guide prevention & control actions. Methods. The team made an outbreak descriptive study; field investigation included description time-place-person; case-definition as patient with active clinical condition of parotitis; Active Institutional Search (AIS and house visitations; study variables matched those of the official individual notification report. Data were registered and analyzed using Epi -Info 3.5.1® with frequency, central trend and association measurements. Results. 14 mumps cases were identified: 1 adult and 13(93% children; 5(35,7% were girls; median age was 11,9 year (range 7-40. Four cases (28,6% were confirmed by clinical signs, 10(71,4% by epidemiologic link; no one was hospitalized. 12 patients (86% had unknown vaccination status; 11 cases (78% produced neither the vaccination card nor any additional information. Index case occurred at EW30/2010 and the epidemic peak occurred at EW34/2010; attack rate was 8.1%. Conclusions. Epidemiology office confirmed mumps outbreak, delayed notification and impossibility to verify vaccination records. The response team recommended the DPS to strengthen biosafety measures; and advised local health institution to increase epidemiologic surveillance & control activities, adherence to national mumps protocol, school vaccination and to promote information, communication, education strategies on importance of vaccination and cards right use.

Santa and the Moon

NARCIS (Netherlands)

Barthel, P.

This article reflects on the use of illustrations of the Moon in images of Santa Claus, on Christmas gift-wrapping paper and in children's books, in two countries which have been important in shaping the image of Santa Claus and his predecessor Sinterklaas: the USA and the Netherlands. The

Novel RGO/α-FeOOH supported catalyst for Fenton oxidation of phenol at a wide pH range using solar-light-driven irradiation

Energy Technology Data Exchange (ETDEWEB)

Wang, Ying, E-mail: yingwang@bnu.edu.cn [The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875 (China); Fang, Jiasheng, E-mail: fangfangcanfly@163.com [The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875 (China); School of Chemistry and Chemical Engineering, Southeast University, Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, Nanjing 211189 (China); Crittenden, John C., E-mail: John.Crittenden@ce.gatech.edu [School of Civil and Environmental Engineering and the Brook Byers Institute for Sustainable Systems, Georgia Institute of Technology, Atlanta, GA 30332-0595 (United States); Shen, Chanchan [The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875 (China)

2017-05-05

Graphical abstract: Schematic of the preparation of RF supported catalysts and the reaction mechanism for SLD Fenton catalytic degradation of aqueous phenol. - Highlights: • Novel SLD Fenton catalyst was synthesized via in-situ induced self-assembly process. • RGO improved light-harvesting capacity and enhanced electro-transport performance. • Visible light irradiation accelerated reaction and extended operating pHs (4.0–8.0). • H{sub 2}O{sub 2} reduction and H{sub 2}O oxidation yielded ·OH in Fe{sup Ⅱ}/Fe{sup Ⅲ} and Fe{sup Ⅲ}/Fe{sup Ⅳ} cycling process. - Abstract: A novel solar-light-driven (SLD) Fenton catalyst was developed by reducing the ferrous-ion onto graphene oxide (GO) and forming reduced graphene oxide/α-FeOOH composites (RF) via in-situ induced self-assembly process. The RF was supported on several mesoporous supports (i.e., Al-MCM-41, MCM-41 and γ-Al{sub 2}O{sub 3}). The activity, stability and energy use for phenol oxidation were systematically studied for a wide pH range. Furthermore, the catalytic mechanism at acid and alkaline aqueous conditions was also elucidated. The results showed that Fe(II) was reduced onto GO nanosheets and α-FeOOH crystals were formed during the self-assembly process. Compared with Fenton reaction without SLD irradiation, the visible light irradiation not only dramatically accelerated the rate of Fenton-based reactions, but also extended the operating pH for the Fenton reaction (from 4.0 to 8.0). The phenol oxidation on RF supported catalysts was fitting well with the pseudo-first-order kinetics, and needed low initiating energy, insensitive to the reacting temperature changes (273–318 K). The Al-MCM-41 supported RF was a more highly energy-efficient catalyst with the prominent catalytic activity at wide operating pHs. During the reaction, ·OH radicals were generated by the SLD irradiation from H{sub 2}O{sub 2} reduction and H{sub 2}O oxidation in the Fe{sup Ⅱ}/Fe{sup Ⅲ} and Fe{sup Ⅲ}/Fe{sup �

Preparation, characterization and visible-light-driven photocatalytic activity of a novel Fe(III) porphyrin-sensitized TiO{sub 2} nanotube photocatalyst

Energy Technology Data Exchange (ETDEWEB)

Wei, Meng [National Engineering Lab of Textile Fiber Materials & Processing Technology, Zhejiang Sci-Tech University, Hangzhou 310018 (China); Wan, Junmin, E-mail: wwjm2001@126.com [National Engineering Lab of Textile Fiber Materials & Processing Technology, Zhejiang Sci-Tech University, Hangzhou 310018 (China); State Key Laboratory of advanced Textiles Materials and Manufacture Technology, MOE, Zhejiang Sci-Tech University, Hangzhou 310018 (China); Hu, Zhiwen; Peng, Zhiqin; Wang, Bing [National Engineering Lab of Textile Fiber Materials & Processing Technology, Zhejiang Sci-Tech University, Hangzhou 310018 (China); Wang, Huigang [State Key Laboratory of advanced Textiles Materials and Manufacture Technology, MOE, Zhejiang Sci-Tech University, Hangzhou 310018 (China)

2017-01-01

Highlights: • FeTCPP-TNT photocatalysts are synthesized. • FeTCPP and tube-like structure are helpful to induce interfacial charge transfer at surface junction. • FeTCPP and tube-like structure are favorable for enhancing photocatalytic activity. • The photocatalytic mechanism of FeTCPP-TNT is proposed. • The photocatalyst are proven to be effective and chemically-stable catalysts. - Abstract: Iron(III) meso-tetra(4-carboxyphenyl) porphyrin (FeTCPP) loaded on the surface of TiO{sub 2} nanotubes (TNTs) has been successfully prepared through improved hydrothermal and heating reflux process. The new photocatalyst has been characterized and analyzed by TEM/EDS, BET, XRD, FT-IR, DRS, PL, XPS and EPR. The photocatalytic activity of FeTCPP/TNT nanocomposite was evaluated by the photodegradation of MB under visible light irradiation. The degradation results showed a purification of more than 90% MB in simulating wastewater, and confirmed that the prepared FeTCPP/TNT nanocomposite has acquired superior photocatalytic activitiy. The 6 times cycled results suggested the great stability of the photocatalyst. These results confirmed the FeTCPP played an important role in capturing photons and expanding the absorption wavelength to the visible light region, and the FeTCPP/TNT photocatalyst is also beneficial for the electron transfer and long-distance transmission, and could efficiently increase the separation of the electron-hole pairs, and accelerate the decomposition of organic pollutants. In addition, nano-sized structures can increase adsorption capability.

Breakfast habit and quality in students from two public primary schools in the city of Santa Fe.

Science.gov (United States)

Fugas, Valeria; Berta, Eugenia; Walz, Florencia; Fortino, Ma Alejandra; Martinelli, Marcela J

2013-12-01

Breakfast provides the necessary energy and nutrients to achieve an optimal physical and mental performance. OBJECTIVE. To find out breakfast frequency, factors that influence breakfast habit and skipping, breakfast quality and snack intake in children from public schools in the city of Santa Fe. POPULATION AND METHODS. Descriptive, cross-sectional study. A total of 637 students were assessed using a closed-ended question survey. RESULTS. Seventy five percent of children had breakfast on a daily basis; only 1.6% had a good quality breakfast. Eating breakfast every day or some days did not depend on having the company of a family member. In the case of first to fifth grade children, the weekly frequency depended on having a family member who made it (p= 0.04). The main cause for skipping breakfast was lack of time. Twenty-three percent of children in sixth and seventh grade indicated feeling unwell when having breakfast. More than 50% of children watched television while having breakfast. Most students in first to third grade had breakfast that could be improved (41%) and which was insufficient (41%). An insufficient quality breakfast was more common among fourth and fifth grade students (50%). A remarkable piece of information is the number of sixth and seventh grade children who had a poor quality breakfast (16%). Very few children had a snack that was appropriate to supplement the final quality of breakfast. CONCLUSIONS. Although a high percentage of school-aged children are used to having breakfast, most have an incomplete breakfast. Very few manage to supplement their breakfast with snacks at mid-morning.

Deposition of CdS nanoparticles on MIL-53(Fe) metal-organic framework with enhanced photocatalytic degradation of RhB under visible light irradiation

Energy Technology Data Exchange (ETDEWEB)

Hu, Longxing, E-mail: hulxhhhb@shu.edu.cn [School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444 (China); Deng, Guihua [School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444 (China); Lu, Wencong [College of Sciences, Shanghai University, Shanghai 200444 (China); Pang, Siwei; Hu, Xing [School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444 (China)

2017-07-15

Graphical abstract: The CdS/MIL-53(Fe) photocatalyst has been synthesized by a facile two-step solvothermal method and applied for photocatalytic degradation of organic pollutant RhB under visible light irradiation. - Highlights: • A novel CdS/MIL-53(Fe) photocatalyst was successfully synthesized via a facile two-step solvothermal method. • CdS/MIL-53(Fe) exhibited an enhanced visible-light photocatalytic degradation of RhB in water. • The mechanisms for the formation of CdS/MIL-53(Fe) and photocatalytic degradation of RhB were proposed. - Abstract: A novel composite, CdS/MIL-53(Fe), was successfully fabricated via a facile solvothermal method and characterized with XRD, SEM, TEM, XPS, FT-IR and UV–vis DRS. The results showed that the fabrication was able to result in a good dispersion of CdS nanoparticles onto MIL-53(Fe). The photocatalytic activities of the as-synthesized composite were investigated through the degradation of Rhodamine B (RhB) in water under visible light irradiation. It was found that the composite prepared at the mass ratio of CdS to MIL-53(Fe) of 1.5:1 displayed the highest photocatalytic activity. An approximately 92.5% of photocatalytic degradation of RhB was achieved at 0.5 g/L of 1.5-CdS/MIL dosage, 10 mg/L of initial RhB concentration and 23 °C of reaction temperature under visible light irradiation. The RhB photocatalytic degradation followed well the first-order kinetics equation and the increased catalyst dosage and optimal initial RhB concentration were responsible for the enhanced photocatalytic degradation. Quenching tests revealed that the predominant free radicals in the CdS/MIL-(53)-RhB{sub aq}-visible light system was O{sub 2}{sup −}·; nevertheless, h{sup +} and ·OH also contributed to a certain degree. The enhanced photocatalytic performance was ascribed to the formation of heterojunction structure between CdS and MIL-53(Fe) which significantly suppressed the recombination of photogenerated electron-hole pairs

Deposition of CdS nanoparticles on MIL-53(Fe) metal-organic framework with enhanced photocatalytic degradation of RhB under visible light irradiation

International Nuclear Information System (INIS)

Hu, Longxing; Deng, Guihua; Lu, Wencong; Pang, Siwei; Hu, Xing

2017-01-01

Graphical abstract: The CdS/MIL-53(Fe) photocatalyst has been synthesized by a facile two-step solvothermal method and applied for photocatalytic degradation of organic pollutant RhB under visible light irradiation. - Highlights: • A novel CdS/MIL-53(Fe) photocatalyst was successfully synthesized via a facile two-step solvothermal method. • CdS/MIL-53(Fe) exhibited an enhanced visible-light photocatalytic degradation of RhB in water. • The mechanisms for the formation of CdS/MIL-53(Fe) and photocatalytic degradation of RhB were proposed. - Abstract: A novel composite, CdS/MIL-53(Fe), was successfully fabricated via a facile solvothermal method and characterized with XRD, SEM, TEM, XPS, FT-IR and UV–vis DRS. The results showed that the fabrication was able to result in a good dispersion of CdS nanoparticles onto MIL-53(Fe). The photocatalytic activities of the as-synthesized composite were investigated through the degradation of Rhodamine B (RhB) in water under visible light irradiation. It was found that the composite prepared at the mass ratio of CdS to MIL-53(Fe) of 1.5:1 displayed the highest photocatalytic activity. An approximately 92.5% of photocatalytic degradation of RhB was achieved at 0.5 g/L of 1.5-CdS/MIL dosage, 10 mg/L of initial RhB concentration and 23 °C of reaction temperature under visible light irradiation. The RhB photocatalytic degradation followed well the first-order kinetics equation and the increased catalyst dosage and optimal initial RhB concentration were responsible for the enhanced photocatalytic degradation. Quenching tests revealed that the predominant free radicals in the CdS/MIL-(53)-RhB aq -visible light system was O 2 − ·; nevertheless, h + and ·OH also contributed to a certain degree. The enhanced photocatalytic performance was ascribed to the formation of heterojunction structure between CdS and MIL-53(Fe) which significantly suppressed the recombination of photogenerated electron-hole pairs. Moreover, the

Solar light-driven photocatalysis using mixed-phase bismuth ferrite (BiFeO3/Bi25FeO40) nanoparticles for remediation of dye-contaminated water: kinetics and comparison with artificial UV and visible light-mediated photocatalysis.

Science.gov (United States)

Kalikeri, Shankramma; Shetty Kodialbail, Vidya

2018-05-01

Mixed-phase bismuth ferrite (BFO) nanoparticles were prepared by co-precipitation method using potassium hydroxide as the precipitant. X-ray diffractogram (XRD) of the particles showed the formation of mixed-phase BFO nanoparticles containing BiFeO 3 /Bi 25 FeO 40 phases with the crystallite size of 70 nm. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed the formation of quasi-spherical particles. The BFO nanoparticles were uniform sized with narrow size range and with the average hydrodynamic diameter of 76 nm. The band gap energy of 2.2 eV showed its ability to absorb light even in the visible range. Water contaminated with Acid Yellow (AY-17) and Reactive Blue (RB-19) dye was treated by photocatalysis under UV, visible, and solar light irradiation using the BFO nanoparticles. The BFO nanoparticles showed maximum photocatalytical activity under solar light as compared to UV and visible irradiations, and photocatalysis was favored under acidic pH. Complete degradation of AY-17 dyes and around 95% degradation of RB-19 could be achieved under solar light at pH 5. The kinetics of degradation followed the Langmuir-Hinshelhood kinetic model showing that the heterogeneous photocatalysis is adsorption controlled. The findings of this work prove the synthesized BFO nanoparticles as promising photocatalysts for the treatment of dye-contaminated industrial wastewater.

Recyclable UV and visible light photocatalytically active amorphous TiO2 doped with M (III) ions (M = Cr and Fe)

International Nuclear Information System (INIS)

Buddee, Supat; Wongnawa, Sumpun; Sirimahachai, Uraiwan; Puetpaibool, Walailak

2011-01-01

Research highlights: → The low photocatalytic activity of amorphous TiO2 was enhanced by doping with Cr(III) or Fe(III) ions. → The doped catalysts performed close to P25 under UV light and better with visible light. → The doped catalysts can be recycled. - Abstract: Samples of amorphous TiO 2 doped with Cr(III) and Fe(III), designated as Cr-TiO 2 and Fe-TiO 2 , were prepared via modified impregnation method. The resulting products were characterized by X-ray diffraction, scanning electron microscopy, specific surface area by the Brunauer, Emmett and Teller method, UV-vis absorption and diffuse reflectance spectroscopy, and electron spin resonance spectroscopy. Experimental results revealed that the concentrations of dopants under studied, from 0.05 to 0.2 mol%, had no effect on the phase of products. The band gap energies shifted from 3.28 eV in the undoped amorphous TiO 2 to 2.50 eV and 2.86 eV for Fe-TiO 2 and Cr-TiO 2 , respectively. The doped amorphous TiO 2 showed photocatalytic activities under both UV and visible light with optimal results at 0.1 mol% dopants. Under UV irradiation, the 0.1 mol% doped samples decolorized methylene blue solutions to the same extent as the commercial TiO 2 samples (P25 and anatase) in 5 h. Under visible light, the doped samples decolorized dye solutions in 12 h while the commercial ones were much less active. The used catalysts can be recycled many times without any special treatment.

Facile one-pot construction of α-Fe_2O_3/g-C_3N_4 heterojunction for arsenic removal by synchronous visible light catalysis oxidation and adsorption

International Nuclear Information System (INIS)

Sun, Suwen; Ji, Chunnuan; Wu, Lingling; Chi, Shenghua; Qu, Rongjun; Li, Yan; Lu, Yangxiao; Sun, Changmei; Xue, Zhongxin

2017-01-01

α-Fe_2O_3/g-C_3N_4 composites with heterojunction were prepared by facile one-pot synthesis using ferric chloride and dicyandiamide as precursors. The newly formed composites were applied to remove arsenic from aqueous solution for the first time through synchronous visible light catalysis oxidation and adsorption. α-Fe_2O_3/g-C_3N_4 composites were characterized by wide-angle X-ray powder diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, UV–Vis diffuse reflectance spectroscopy, and BET surface analysis. Under visible light irradiation, As(III) was oxidized to As(V) efficiently on the surface of α-Fe_2O_3/g-C_3N_4. In addition, the oxidized arsenic could be adsorbed in situ, resulting in the effective arsenic removal. The enhancement of photocatalytic activity the composites was attributed to the construction of heterojunction between α-Fe_2O_3 and g-C_3N_4. A possible oxidation mechanism of the as-composites for As(III) under visible light irradiation was also elucidated. - Highlights: • α-Fe_2O_3/g-C_3N_4 composites with heterojunction was prepared by facile one-pot synthesis. • The photocatalytic activity of α-Fe_2O_3/g-C_3N_4 composites under visible light irradiation for As(III) was evaluated. • Synchronous visible light catalysis oxidation and adsorption were achieved for the removal of arsenic. • The reasonable oxidation mechanism of the composites for As(III) under visible light irradiation was investigated.

Presencia de Hydrochoerus hydrochaeris (Hydrochoeridae, Rodentia, Mammalia en la cuenca del río Carcarañá, Santa Fe, Argentina: Comentarios acerca de su conservación y biogeografía en Argentina

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Pablo G. Rimoldi

2014-01-01

Full Text Available El carpincho (Hydrochoerus hydrochaeris es el roedor actual más grande del mundo y uno de los mamíferos típico de las Provincias Fitogeográficas Pampeana y del Espinal, habitando todo el sector Este de las mismas. Estas regiones han sido categorizadas por la World Wildlife Foundation (WWF como áreas "en peligro crítico/ amenazada", y se les asigna el nivel de máxima prioridad de conservación como consecuencia de la destrucción de hábitat, la sobreexplotación, la contaminación y la introducción de especies exóticas. El carpincho presenta una preferencia marcada por los ambientes con abundancia de cuerpos de agua donde la vegetación palustre le proporciona alimento y refugio. De esta forma, tanto los cuerpos de agua como la vegetación asociada es determinante para la prevalescencia de poblaciones de carpinchos en un ambiente determinado. Para la provincia de Santa Fe los registros no son muy abundantes, registrándose hasta la actualidad unos 33 puntos de colecta/observación, la gran mayoría ubicados en el centro y norte de la provincia. El objetivo de la presente contribución es presentar nuevos registros de presencia de Hydrochoerus hydrochaeris en la cuenca del río Carcarañá (sur de la provincia de Santa Fe, y su asociación con algunas variables climático-ambientales y evaluar la distribución de esta especie. Finalmente, se discute la posible expansión o migración de este especie hacia el oeste de esta provincia y de la provincia de Buenos Aires.

Fabrication of CaFe2O4 nanofibers via electrospinning method with enhanced visible light photocatalytic activity

Science.gov (United States)

Wang, Jianmin; Wang, Yunan; Liu, Yinglei; Li, Song; Cao, Feng; Qin, Gaowu

CaFe2O4 nanofibers with diameters of about 130nm have been fabricated via a facile electrospinning method. The structures, morphologies and optical properties of the obtained CaF2O4 nanofibers have been investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and UV-Visible UV-Vis diffuse reflectance spectrum. The photocatalytic activities of the CaFe2O4 nanofibers are evaluated by the photo-degradation of Methyl orange (MO). The results show that the CaFe2O4 nanofibers (72%) exhibit much higher photocatalytic performance than the CaFe2O4 powders (27%) prepared by conventional method under visible light irradiation. The enhanced photocatalytic performance of CaFe2O4 nanofibers could be attributed to the large surface area, high photogenerated charge carriers density and low charge transfer resistance, as revealed by photoelectrochemical measurement. And fundamentally, it could be attributed to the decreased particle size and the fibrous nanostructure. This work not only provides an efficient way to improve the photocatalytic activity of CaFe2O4, but also provides a new method for preparing materials with nanofibrous structure.

Aspectos epidemiológicos del cáncer no melanoma de piel en un servicio de dermatología de la ciudad de Santa Fe - Argentina 2007 Epidemiologic aspects to the skin cancer non melanoma in a dermatologic office of the Santa Fe city - Argentine 2007

Directory of Open Access Journals (Sweden)

B L M Lukaszuk

2008-03-01

Full Text Available Antecedentes: la incidencia del cáncer no melanoma de piel (CNMP, principalmente en países tropicales ha aumentado en grandes proporciones. La identificación de lesiones sospechosas y aquellas relacionadas directamente con el cáncer de piel es efectuada en ocasiones por colegas de muchas especialidades médicas. Objetivos: estudiar las características de la frecuencia del CNMP en relación con ciertos factores de riesgo en el Hospital José María Cullen, de la ciudad de Santa Fe, capital de la provincia del mismo nombre, Argentina. Materiales y métodos: estudio retrospectivo, no experimental, descriptivo y de corte transversal. La muestra quedó conformada por 61 pacientes de ambos sexos y de 1 a 83 años. Se confeccionó una historia clínica completa de los pacientes candidatos a la toma de biopsia, que luego fue analizada por el Servicio de Anatomía Patológica. Se realizó un análisis descriptivo utilizando el programa SPSS 11.5, mediante el cual se usó la prueba de Chi cuadrado y tablas de contingencia para relacionar las variables y comparar los datos. Se estableció una asociación estadísticamente significativa cuando se halló un valor de pBackground: The incidence of non-melanoma skin cancer (NMSC, mainly in tropical countries has increased in large proportions. The identification of suspicious lesions and those directly related to the skin cancer is made by colleagues of many medical specialities. Objectives: Study the characteristics of the frequency of NMSC and their relation with certain risk factors in the Hospital José María Cullen, city of Santa Fe, capital of the province of the same name, Argentina. Materials and Methods: This was a retrospective, not experimental, descriptive and transversal cut study. The sample was composed by 61 patients of both sexs and from 1 to 83 years old. A complete clinical history of patients with suspected lesions were developed. After the biopsy collection, the Department of

Metal concentrations in demersal fish species from Santa Maria Bay, Baja California Sur, Mexico (Pacific coast).

Science.gov (United States)

Jonathan, M P; Aurioles-Gamboa, David; Villegas, Lorena Elizabeth Campos; Bohórquez-Herrera, Jimena; Hernández-Camacho, Claudia J; Sujitha, S B

2015-10-15

Concentrations of 11 trace metals (Fe, Mn, Cr, Cu, Ni, Co, Pb, Zn, Cd, As, Hg) in 40 fish species from Santa Maria Bay, Baja California Sur, Mexico, the strategically important area for marine mammals and organisms were analyzed. Based on their concentrations the ranking of metals Fe>Zn>Ni>Cr>Mn>Pb>Cu>Co>As>Cd>Hg suggests that organism size, metabolism and feeding habits are correlated with metal concentrations. Local geological formations affect the concentrations of different metals in the aquatic environment and are subsequently transferred to fishes. The correlation analysis suggests that metabolism and nurturing habits impact the concentration of metals. Concentrations of Fe and Mn appear to be influenced by scavenging and absorption processes, which vary by species. The considerable variability in the metal concentrations obtained in different species underscores the importance of regular monitoring. Copyright © 2015 Elsevier Ltd. All rights reserved.

Light-Induced Type-II Band Inversion and Quantum Anomalous Hall State in Monolayer FeSe

Science.gov (United States)

Wang, Z. F.; Liu, Zhao; Yang, Jinlong; Liu, Feng

2018-04-01

Coupling a quantum anomalous Hall (QAH) state with a superconducting state offers an attractive approach to detect the signature alluding to a topological superconducting state [Q. L. He et al., Science 357, 294 (2017), 10.1126/science.aag2792], but its explanation could be clouded by disorder effects in magnetic doped QAH materials. On the other hand, an antiferromagnetic (AFM) quantum spin Hall (QSH) state is identified in the well-known high-temperature 2D superconductor of monolayer FeSe [Z. F. Wang et al., Nat. Mater. 15, 968 (2016), 10.1038/nmat4686]. Here, we report a light-induced type-II band inversion (BI) and a QSH-to-QAH phase transition in the monolayer FeSe. Depending on the handedness of light, a spin-tunable QAH state with a high Chern number of ±2 is realized. In contrast to the conventional type-I BI resulting from intrinsic spin-orbital coupling (SOC), which inverts the band an odd number of times and respects time reversal symmetry, the type-II BI results from a light-induced handedness-dependent effective SOC, which inverts the band an even number of times and does not respect time reversal symmetry. The interplay between these two SOC terms makes the spin-up and -down bands of an AFM QSH state respond oppositely to a circularly polarized light, leading to the type-II BI and an exotic topological phase transition. Our finding affords an exciting opportunity to detect Majorana fermions in one single material without magnetic doping.

Optimization of α-Fe{sub 2}O{sub 3}@Fe{sub 3}O{sub 4} incorporated N-TiO{sub 2} as super effective photocatalysts under visible light irradiation

Energy Technology Data Exchange (ETDEWEB)

Mohamed, Mohamed Mokhtar, E-mail: mohmok2000@yahoo.com [Benha University, Faculty of Science, Chemistry Department, Benha (Egypt); Bayoumy, W.A. [Benha University, Faculty of Science, Chemistry Department, Benha (Egypt); Goher, M.E. [National Institute of Oceanography & Fisheries, Environmental Chemistry, Cairo (Egypt); Abdo, M.H., E-mail: mh_omr@yahoo.com [National Institute of Oceanography & Fisheries, Environmental Chemistry, Cairo (Egypt); Mansour El-Ashkar, T.Y. [National Institute of Oceanography & Fisheries, Environmental Chemistry, Cairo (Egypt)

2017-08-01

Highlights: • The α-Fe{sub 2}O{sub 3}/Fe{sub 3}O{sub 4} doped n-TiO{sub 2} was synthesized via deposition-self assembly technique. • The photocatalyst 1%α-Fe{sub 2}O{sub 3}/Fe{sub 3}O{sub 4}/n-TiO{sub 2} show a remarkable performance while MB degradation. • The strong interaction between α-Fe{sub 2}O{sub 3}/Fe{sub 3}O{sub 4} and n-TiO{sub 2} plays an important role. • It exhibits a unique textural, optical and charge transfer properties. - Abstract: Well dispersed α-Fe{sub 2}O{sub 3}@Fe{sub 3}O{sub 4} nanoparticles (7 nm) supported on mesoporous nitrogen doped titanium dioxide (N-TiO{sub 2}) are synthesized by deposition self-assembly route and their performances as photocatalysts toward methylene blue (MB) degradation are evaluated. The results illustrate that the spherical yolk-shell structure of α-Fe{sub 2}O{sub 3}@Fe{sub 3}O{sub 4}@N-TiO{sub 2} at the loading of 1%; of excellent S{sub BET} (187 m{sup 2} g{sup −1}) and pore volume (0.50 cm{sup 3} g{sup −1}), achieved high photocatalytic performance for the MB degradation (20 ppm, λ > 420 nm, lamp power = 160 W) under visible light illumination (k = 0.059 min{sup −1}). The influence of the interface formation between α-Fe{sub 2}O{sub 3}@Fe{sub 3}O{sub 4} and n-TiO{sub 2} affects severely the charges separation efficiency and enhances the electron transfer to keep on the existence of Fe{sup 3+}/Fe{sup 2+} moieties; those take significant role in the reaction mechanism. The existence of the latter junction is affirmed via XRD, TEM-SAED, Raman and FTIR techniques whereas, the photogenerated charges, their separation together with their transport and recombination rates are depicted via photoluminescence, electrical conductivity, incident photon to current efficiency (IPCE), cyclic voltammetry (CV) and impedance (EIS) measurements. The catalyst loading, zero point charge, pH variation, total organic carbon (TOC%) and the effect of lamps power are thoroughly investigated. The 1%α-Fe{sub 2}O{sub 3

Efficient solar light-driven degradation of Congo red with novel Cu-loaded Fe3O4@TiO2 nanoparticles.

Science.gov (United States)

Arora, Priya; Fermah, Alisha; Rajput, Jaspreet Kaur; Singh, Harminder; Badhan, Jigyasa

2017-08-01

In this work, Cu-loaded Fe 3 O 4 @TiO 2 core shell nanoparticles were prepared in a single pot by coating of TiO 2 on Fe 3 O 4 nanoparticles followed by Cu loading. X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HR-TEM), thermogravimetric analysis (TGA), Brunauer-Emmett- Teller (BET), vibrating sample magnetometry (VSM), X-ray photoelectron spectroscopy (XPS), and valence band X-ray photoelectron spectroscopy (VB XPS) techniques were used for characterization of as prepared nanoparticles. Synergism between copper and titania was evaluated by studying the solar light-driven photodegradation of Congo red dye solution in the presence of Fe 3 O 4 @TiO 2 nanoparticles on one side and Cu-loaded Fe 3 O 4 @TiO 2 nanoparticles on the other side. The latter performed better than the former catalyst, indicating the enhanced activity of copper-loaded catalyst. Further photodegradation was studied by three means, i.e., under ultraviolet (UV), refluxing, and solar radiations. Cu-loaded Fe 3 O 4 @TiO 2 enhanced the degradation efficiency of Congo red dye. Thus, Cu act possibly by reducing the band gap of TiO 2 and widening the optical response of semiconductor, as a result of which solar light could be used to carry out photocatalysis. Graphical abstract Photodegradation of congo red over Cu-loaded Fe 3 O 4 @TiO 2 nanoparticles.

Photocatalytic Reduction Activity of 001  TiO2 Codoped with F and Fe under Visible Light for Bromate Removal

Directory of Open Access Journals (Sweden)

Yan Zhang

2016-01-01

Full Text Available The presence of bromate in water is a well-known problem because of its toxic effects on human health, particularly its carcinogenic potential. Photocatalytic reduction is an attractive process for bromate removal. F- and Fe-codoped TiO2 (F-Fe-TiO2 with a {001} facet was successfully prepared, and its bromate-removal activity under visible light was examined. The microstructure, morphology, and chemical state of the doping elements and the optical property of the photocatalysts were examined using transmission electron microscopy (TEM, X-ray photoelectron spectroscopy (XPS, electron paramagnetic resonance (EPR, photoluminescence spectroscopy (PLS, and UV-Vis diffuse reflectance spectra (DRS. The results indicate that the optical properties of F-Fe-TiO2 with the {001} facet and cuboid morphology were obviously improved and its photocatalytic activity was significantly enhanced. The bromate solution of 100 μg/L was thoroughly removed with 0.5 g/L dosage of 1.0% F- and 0.08% Fe-codoped TiO2 composite within 1 hour under visible light.

Hydrogen and electricity production in a light-assisted microbial photoelectrochemical cell with CaFe2O4 photocathode

Science.gov (United States)

Chen, Qing-Yun; Zhang, Kai; Liu, Jian-Shan; Wang, Yun-Hai

2017-04-01

A microbial photoelectrochemical cell (MPEC) was designed with a p-type CaFe2O4 semiconductor as the photoelectrode for simultaneous hydrogen and electricity production under light illumination. The CaFe2O4 photoelectrode was synthesized by the sol-gel method and well characterized by x-ray diffraction, field emission scanning electron microscope, and UV-Vis-NIR spectrophotometer. The linear sweep voltammogram of the CaFe2O4 photoelectrode presented the cathodic photocurrent output. For the MPEC, with an external resistance of 2000 Ω, the maximum power density of 143 mW was obtained. Furthermore, with an external resistance of 100 Ω, the maximum hydrogen production rate of 6.7 μL·cm-2 could be achieved. The MPEC with CaFe2O4 photocathode was compared to MPEC with other photocathodes as well as photocatalytic water splitting technology.

Structural Investigation of Fe-Ni-S and Fe-Ni-Si Melts by High-temperature Fluorescence XAFS Measurements

International Nuclear Information System (INIS)

Manghnani, Murli H.; Balogh, John; Hong Xinguo; Newville, Matthew; Amulele, G.

2007-01-01

Iron-nickel (Fe-Ni) alloy is regarded as the most abundant constituent of Earth's core, with an amount of 5.5 wt% Ni in the core based on geochemical and cosmochemical models. The structural role of nickel in liquid Fe-Ni alloys with light elements such as S or Si is poorly understood, largely because of the experimental difficulties of high-temperature melts. Recently, we have succeeded in acquiring Ni K-edge fluorescence x-ray absorption fine structure (XAFS) spectra of Fe-Ni-S and Fe-Ni-Si melts and alloys. Different structural environment of Ni atoms in Fe-Ni-S and Fe-Ni-Si melts is observed, supporting the effect of light elements in Fe-Ni melts

Enhanced photocatalytic activity and characterization of magnetic Ag/BiOI/ZnFe2O4 composites for Hg0 removal under fluorescent light irradiation

Science.gov (United States)

Li, Chengwei; Zhang, Anchao; Zhang, Lixiang; Song, Jun; Su, Sheng; Sun, Zhijun; Xiang, Jun

2018-03-01

A series of magnetic Ag/BiOI/ZnFe2O4 hybrids synthesized via hydrothermal process, subsequent deposition-precipitation and photoreduction method were employed to remove elemental mercury (Hg0) under fluorescent light irradiation. The effects of Ag content, fluorescent light irradiation, reaction temperature, pH value, flue gas composition, anions and photocatalyst dosage on Hg0 removal were investigated in detail. The as-synthesized photocatalysts were characterized using N2 adsorption-desorption, XRD, SEM, TEM, HRTEM, XPS, VSM, DRS, ESR, PL and photocurrent response. The results showed that the ternary Ag/BiOI/ZnFe2O4 hybrids possessed enhanced visible-light-responsive photocatalytic performances for Hg0 removal. Ag/BiOI/ZnFe2O4 photocatalyst could be easily recovered from the reaction solution by an extra magnet and was stable in the process of Hg0 removal. Lower content of Ag was highly dispersed on the surface of BiOI/ZnFe2O4, while higher content of Ag would result in some aggregations and/or the blockages of micropore. In comparison to BiOI/ZnFe2O4, Ag deposited BiOI/ZnFe2O4 material showed lower recombination rate of electron-hole pairs. The superior Hg0 oxidation removal could correspond to good match of BiOI and ZnFe2O4, excellent fluidity and surface plasmon resonance effect of Ag0 nanoparticles, which led to higher separation efficiency of photogenerated electrons and holes, thereby enhancing the hybrids' photocatalytic activity.

Influence of rootstocks on growth, yield, fruit quality and leaf mineral element contents of pear cv. 'Santa Maria' in semi-arid conditions

Directory of Open Access Journals (Sweden)

Ali Ikinci

2014-01-01

Full Text Available BACKGROUND: Rootstocks play an essential role to determining orchard performance of fruit trees. Pyrus communisand Cydonia oblonga are widely used rootstocks for European pear cultivars. The lack of rootstocks adapted to different soil conditions and different grafted cultivars is widely acknowledged in pear culture. Cydonia rootstocks (clonal and Pyrus rootstocks (seedling or clonal have their advantages and disadvantages. In each case, site-specific environmental characteristics, specific cultivar response and production objectives must be considered before choosing the best rootstock. In this study, the influence of three Quince (BA 29, Quince A = MA, Quince C = MC and a local European pear seedling rootstocks on the scion yield, some fruit quality characteristics and leaf macro (N, P, K, Ca and Mg and micro element (Fe, Zn, Cu, Mn and B content of 'Santa Maria' pear (Pyrus communis L. were investigated. RESULTS: Trees on seedling rootstock had the highest annual yield, highest cumulative yield (kg tree−1, largest trunk cross-sectional area (TCSA, lowest yield efficiency and lowest cumulative yield (ton ha−1 in the 10th year after planting. The rootstocks had no significant effect on average fruit weight and fruit volume. Significantly higher fruit firmness was obtained on BA 29 and Quince A. The effect of rootstocks on the mineral element accumulation (N, K, Ca, Mg, Fe, Zn, Cu, Mn and B was significant. Leaf analysis showed that rootstocks used had different mineral uptake efficiencies throughout the early season. CONCLUSION: The results showed that the rootstocks strongly affected fruit yield, fruit quality and leaf mineral element uptake of 'Santa Maria' pear cultivar. Pear seedling and BA 29 rootstock found to be more prominent in terms of several characteristics for 'Santa Maria' pear cultivar that is grown in highly calcareous soil in semi-arid climate conditions. We determined the highest N, P (although insignificant, K, Ca, Mg, Fe

Photoinduced structural transformation of SrFeO3 and Ca2Fe2O5 during photodegradation of methyl orange

International Nuclear Information System (INIS)

Yang Yang; Cao Zhengquan; Jiang Yinshan; Liu Lihua; Sun Yanbin

2006-01-01

Photodegradation of methyl orange solution under UV light irradiation have been studied over photocatalyst perovskite SrFeO 3 and brownmillerite Ca 2 Fe 2 O 5 . XRD and FTIR analysis show that both SrFeO 3 and Ca 2 Fe 2 O 5 transform to carbonates during the photodegradation process of methyl orange. This result indicates that UV light irradiation induce a photochemical reaction between photocatalysts and CO 2 released from the photodegradation of methyl orange. The photochemical reaction between photocatalysts and CO 2 is responsible for the transformation of the structures. The fact that SrFeO 3 has better photocatalytic property and endures serious transformation than Ca 2 Fe 2 O 5 is due to existence of unstable Fe (IV) in the perovskite structure of SrFeO 3. Such kind of Fe (IV) makes perovskite structure unstable and sensitive to ambient (especially sensitive to UV light irradiation)

External Mask Based Depth and Light Field Camera

Science.gov (United States)

2013-12-08

External mask based depth and light field camera Dikpal Reddy NVIDIA Research Santa Clara, CA dikpalr@nvidia.com Jiamin Bai University of California...passive depth acquisition technology is illustrated by the emergence of light field camera companies like Lytro [1], Raytrix [2] and Pelican Imaging

Synthesis, optical, and photocatalytic properties of a new visible-light-active ZnFe{sub 2}O{sub 4}-TiO{sub 2} nanocomposite material

Energy Technology Data Exchange (ETDEWEB)

Moreira, E. [University of Lisbon, Department of Chemistry and Biochemistry, Faculty of Sciences (Portugal); Fraga, L. A. [Universidade da Coruna, Facultade de Ciencias (Spain); Mendonca, M. H.; Monteiro, O. C., E-mail: ocmonteiro@fc.ul.pt [University of Lisbon, Department of Chemistry and Biochemistry, Faculty of Sciences (Portugal)

2012-06-15

The synthesis of new ZnFe{sub 2}O{sub 4}-TiO{sub 2} crystalline nanocomposites with enhanced visible-light catalytic performance is reported. Zinc ferrite powders were prepared by a wet method through oxalate precursor at 400 Masculine-Ordinal-Indicator C during 12 h and the nanocomposite materials were obtained through TiO{sub 2} incorporation before (ZnFe{sub 2}O{sub 4}/TiO{sub 2}) and after (TiO{sub 2}/ZnFe{sub 2}O{sub 4}) the ZnFe{sub 2}O{sub 4} synthesis. The influence of the nanocomposite design in the structural, morphological, and optical properties of the composite oxide materials was studied, by XRD, SEM/TEM, BET measurements, and DRS. New and improved optical features were observed in the ZnFe{sub 2}O{sub 4}-TiO{sub 2} absorption spectra comparatively with the TiO{sub 2} and ZnFe{sub 2}O{sub 4} ones. These results are discussed based on the interface effect and a proposal for the photogenerated electron transitions in the ZnFe{sub 2}O{sub 4}-TiO{sub 2} is presented. The photocatalytic performance of the prepared samples was evaluated for the methyl orange (MO) degradation process. From all the tested materials, the TiO{sub 2}/ZnFe{sub 2}O{sub 4} was the one with the best photocatalytic activity, even superior to the nanocrystalline TiO{sub 2} one. 100 % reduction of the MO concentration was achieved after 10 min of UV-Vis irradiation on a 10 ppm dye aqueous solution with 0.43 g L{sup -1} of TiO{sub 2}/ZnFe{sub 2}O{sub 4} catalyst. By performing visible-light experiments, it was possible to discuss the influence of the visible-light absorption, charge separation, and photogenerated charge-carrier recombination in the TiO{sub 2}/ZnFe{sub 2}O{sub 4} photocatalytic performance.

Hydrothermal synthesis of CdS nanorods anchored on α-Fe2O3 nanotube arrays with enhanced visible-light-driven photocatalytic properties.

Science.gov (United States)

Lei, Rui; Ni, Hongwei; Chen, Rongsheng; Gu, Huazhi; Zhang, Bowei; Zhan, Weiting

2018-03-15

As an n-type semiconductor with an excellent physicochemical properties, iron oxide (Fe 2 O 3 ) has been extensively used in the fields of environmental pollution control and solar energy conversion. However, the high recombination rate of the photoinduced electron-hole pairs and poor charge mobility for Fe 2 O 3 nanomaterial generally result in low photocatalytic efficiency. Herein, an uniform CdS nanorods grown directly on one-dimensional α-Fe 2 O 3 nanotube arrays (NTAs) are successfully synthesized by a facile hydrothermal method and the constructed heterojunction can be a kind of efficient and recyclable photocatalysts. Successful deposition of CdS nanorods onto the α-Fe 2 O 3 NTAs is verified by field emission scanning electron microscopy(FESEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM) with energy dispersive X-ray spectroscopy (EDS). UV-Vis diffuse reflectance spectroscopy indicates that α-Fe 2 O 3 /CdS NTAs possess the intense visible light absorption and also display a red-shift of the band-edge compared with the pure α-Fe 2 O 3 NTAs. The as-obtained α-Fe 2 O 3 /CdS NTAs display excellent photocatalytic activity for decomposition of methylene blue (MB), methyl orange (MO), and phenol under visible light illumination. Among all the tested photocatalysts, the film synthesized for 3h with good stability exhibits the best photocatalytic properties and produces the highest photocurrent of 1.43 mA/cm 2 at 0.8 V vs. Ag/AgCl electrode, owing to its well formed heterojunction structure, effective electron-hole pair separation and direct electron transfer pathway along the CdS nanorods and α-Fe 2 O 3 NTAs. Besides, the photogenerated holes (h + ) and superoxide radicals (O 2 - ) play dominant roles in the photocatalytic process. On the basis of the photocatalytic results and energy band diagram, the photocatalytic process mechanism is proposed. Considering the easy preparation and excellent performance, α-Fe 2 O 3 /CdS NTAs could

Macroeconomia do Turismo Argentino em Santa Catarina

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Roberto Meurer

2010-07-01

Full Text Available Resumo O Estado de Santa Catarina experimentou um considerável crescimento do setor de turismo nas últimas décadas. O fluxo turístico de origem argentina revelou-se um ingrediente importante dessa trajetória. Este artigo focaliza um aspecto pouco explorado, aparentemente, da participação argentina no turismo estadual: a relação entre a situação macroeconômica do país vizinho e a demanda turística por Santa Catarina lá originada. Começa-se abordando brevemente a problemática geral da macroeconomia do turismo. Depois, discorre-se sobre o crescimento desse setor em Santa Catarina, destacando a presença de argentinos. A terceira parte desenvolve uma análise baseada em tratamento estatístico de dados sobre demanda e receita geradas por esses turistas no estado, com exame das correlações envolvendo taxa de câmbio e taxa de crescimento do PIB da Argentina. Palavras-chave: turismo; Santa Catarina; turistas argentinos; economia argentina Abstract The State of Santa Catarina has witnessed a considerable development of its tourist sector in the last decades. The demand from Argentina has proved to be an important factor of that growth. This article deals with a feature of the presence of Argentinians in the state which seems to be scarcely studied: the relationship between the macroeconomic situation of Argentina and the tourist demand in Santa Catarina originated from that country. The first part of the article considers briefly the general issue of tourism macroeconomics. The second one looks upon tourism growth in Santa Catarina, stressing the presence of visitors from Argentine. The third section develops an analysis based on statistical treatment of data concerning demand and income generated by such tourists in Santa Catarina, involving correlations that consider aspects like exchange rate and the rate of GDP increase in Argentina. Keywords: tourism; Santa Catarina; tourists from Argentina; Argentina’s economy

Harold A. Hyde: Recollections of Santa Cruz County

OpenAIRE

Hyde, Harold A.; Jarrell, Randall; Regional History Project, UCSC Library

2002-01-01

A fifth-generation Santa Cruz County resident, Hyde has been in on the creation of organizations and institutions ranging from UCSC and Cabrillo College to the Community Foundation and the Cultural Council of Santa Cruz County. His contributions to California and Santa Cruz are documented in his oral history. Following infantry combat service with the U.S. Army in Europe during World War II and graduate studies in business at Harvard, Hyde returned to Santa Cruz County and a career a...

Ne, Ar, Fe, and Cu Auger-electron production at National Synchrotron Light Source

International Nuclear Information System (INIS)

Lee, D.H.; Johnson, B.M.; Jones, K.W.; Guardala, N.A.; Price, J.L.; Stumborg, M.F.; Glass, G.A.

1992-01-01

Energetic K and L Auger electrons produced by focussed, filtered, broad-band synchrotron radiation have been measured at the x-ray ring of the National Synchrotron Light Source (NSLS). The x-ray beam was used to study inner-shell photoionization of Ne and Ar gas and Fe and Cu solid film targets. The Auger electrons were analyzed by means of a semi-hemispherical electrostatic electron spectrometer at the energy resolution of ∼ 3 %. The electrons were detected at both 90 degree and 0 degree with respect to the photon beam direction. Broad distributions of the inner-shell photoelectrons were also observed, reflecting the incoming photon flux distribution. The Fe and Cu K Auger electron spectra were found to be very similar to the Ar K Auger electron spectra. This was expected, since deep inner-shell Auger processes are not affected by the outer valence electrons. Above 3 keV in electron energy, there have been few previous Auger electron measurements. 2 figs., 13 refs

Formation of multilayer-Eosin Y-sensitized TiO{sub 2} via Fe{sup 3+} coupling for efficient visible-light photocatalytic hydrogen evolution

Energy Technology Data Exchange (ETDEWEB)

Li, Yuexiang; Guo, Miaomiao; Peng, Shaoqin [Department of Chemistry, Nanchang University, Nanchang 330031 (China); Lu, Gongxuan; Li, Shuben [State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000 (China)

2009-07-15

An efficient visible-light active photocatalyst of multilayer-Eosin Y-sensitized TiO{sub 2} is prepared through linkage of Fe{sup 3+} between not only TiO{sub 2} and Eosin Y but also different Eosin Y molecules to form three-dimensional polymeric dye structure. The multilayer-dye-sensitized photocatalyst is found to have high light harvesting efficiency and photocatalytic activity for hydrogen evolution under visible light irradiation ({lambda} > 420 nm). On the optimum conditions (1:1 initial molar ratio of Eosin Y to Fe(NO{sub 3}){sub 3}, initial 10 x 10{sup -3} M Eosin Y, and 1.0 wt% Pt deposited by in situ photoreduction), its maximal apparent quantum yield for hydrogen evolution is 19.1% from aqueous triethanolamine solution (TEOA aq). The present study highlights linking between dye molecules via metal ions as a general way to develop efficient visible-light photocatalyst. (author)

Calidad de los suelos del norte de Santa Fe: Efecto de la geomorfología y uso de la tierra Soil quality in the north of Santa Fe: Effect of geomorphology and land use

Directory of Open Access Journals (Sweden)

Olga Susana Heredia

2006-12-01

Full Text Available En el norte de la provincia de Santa Fe existen escasos trabajos a escala detallada de las propiedades del suelo, cuyo conocimiento es importante a la hora de tomar decisiones para el uso más adecuado del mismo a nivel predial. En este trabajo se plantea como objetivo analizar el efecto de la geomorfología y el uso de la tierra sobre las propiedades físicoquímicas en suelos de la cuña boscosa santafesina. Se evaluaron los tipos de suelos presentes en distintos ambientes geomorfológicos, se clasificaron taxonómicamente, y se analizaron: textura, carbono oxidable (Cox, fósforo extractable (Pe, reacción del suelo (pH y conductividad eléctrica (CE. Las situaciones analizadas fueron: pastizal natural (Ai; chacra nueva, 2 años de uso agrícola (Ch2; chacra vieja, 20 años de uso agrícola (Ch20; monte (M; quebrachal (Qu y espartillar (Es. Se realizó un ANVA entre las distintas situaciones. Los suelos son Argiudoles típicos, Albacualfes y Epiacualfes, con diferente contenido de arcilla, pH y CE. Al comparar los suelos por su posición en le paisaje, todos se caracterizan por poseer texturas finas, con síntomas de hidromorfismo a distintas profundidades del perfil, bajo contenido de Pe a excepción del monte y pH moderadamente ácido a neutro en superficie alcalinizándose en profundidad, y se diferencian en el espesor del horizonte superficial y en el contenido de sales. Los suelos de posiciones del paisaje positivas (monte se encuentran más desarrollados y si bien son en general de textura fina, presentan menor contenido de arcillas que los de posiciones negativas del paisaje, como el quebrachal y el espartillar. El uso agrícola disminuye los valores de Cox y pH en el corto plazo y solo en el largo plazo disminuye el Pe. El Cox disminuyó 29,1% en la situación Ch2 y 46,7% en la situación Ch20 con respecto a la Ai. Los suelos son deficientes en Pe y su disminución fue de un 35,9% en la situación de mayor uso, sin presentar

Multiferroic and visible light photocatalytic properties of six-layered perovskite oxide Nd{sub 6}Ti{sub 4}Fe{sub 2}O{sub 20}

Energy Technology Data Exchange (ETDEWEB)

Cheng, Xiangyi; Yang, Hongshun; Ruan, Keqing; Xu, Xiaoliang [University of Science and Technology of China, Key Laboratory of Strongly-Coupled Quantum Matter Physics, Chinese Academy of Sciences and School of Physical Sciences, Hefei (China); Meng, Dechao [University of Science and Technology of China, Hefei National Laboratory for Physical Sciences at Microscale, Hefei (China)

2017-04-15

The layered perovskite-related oxide Nd{sub 6}Ti{sub 4}Fe{sub 2}O{sub 20} was prepared by incorporating NdFeO{sub 3} in the host Nd{sub 2}Ti{sub 2}O{sub 7} using floating-zone melting technique. XRD and HRTEM results suggested that the material has a layered structure of n = 6 type. Nd{sub 6}Ti{sub 4}Fe{sub 2}O{sub 20} exhibited spin glass-like behavior, and its magnetic behavior was affected by magnetic Nd{sup 3+} ions strongly at low temperature. The ferromagnetic and ferroelectric properties were observed by magnetic and PFM measurements at the room temperature. UV-Vis absorption spectroscopy revealed that the compound is a visible light absorbing photocatalyst with a direct band gap of 2.2 eV. In addition, the photocatalytic behaviors of bulk Nd{sub 6}Ti{sub 4}Fe{sub 2}O{sub 20} were evaluated by photodegradation of rhodamine B under visible light irradiation. (orig.)

Diversidad y aspectos biológicos de abejas silvestres de un ambiente urbano y otro natural de la región central de Santa Fe, Argentina Diversity and biological aspects of wild bees in an urban and a natural environment in the central region of Santa Fe, Argentina

Directory of Open Access Journals (Sweden)

Milagros Dalmazzo

2010-06-01

Full Text Available El objetivo del presente trabajo fue relevar el elenco de abejas silvestres en la región central de Santa Fe y comparar la diversidad de especies y aspectos biológicos en dos ambientes de una misma región. Las abejas fueron colectadas en el estrato herbáceo de la Reserva Universitaria "Escuela Granja" de la localidad Esperanza, y en la zona urbana de la localidad Susana, ambas ubicadas dentro de la Provincia Fitogeográfica del Espinal. La colecta se realizó en octubre, noviembre y diciembre de 2004 y en enero, febrero y marzo de 2005, registrando las especies vegetales sobre las que se capturaron. Se colectaron 277 ejemplares en total, de los cuales se identificaron 62 especies (27 géneros en 5 familias. Las curvas de rarefacción indican una tasa de acumulación de especies mayor para la Reserva Ecológica, los índices de diversidad de Shannon son 3,25 para la Reserva Ecológica y 2,64 para la Zona Urbana. Para la comparación de las comunidades en ambos sitios, las abejas fueron clasificadas en tres categorías según la especialización en el uso del recurso floral, sustrato de nidificación y comportamiento social. Se observó una asociación entre los grupos especialistas y de nidificación en el suelo con el ambiente natural, y por otro lado, las especies generalistas y de nidificación en cavidades con el ambiente urbano. No se identificaron diferencias, en cuanto a la sociabilidad de las especies, entre ambos sitios.The purpose of this contribution is to present a survey of wild bees in the central region of Santa Fe, and to compare the diversity and biological aspects of the bee communities at two different environments of the same region. Bees were surveyed at the ecological reserve Reserva Universitaria "Escuela Granja" in the locality of Esperanza, and at an urban area in the locality of Susana, both in the Espinal Phytogeographic Province. Bees were sampled from October to December 2004 and from January to March 2005

Fe-N co-doped SiO2@TiO2 yolk-shell hollow nanospheres with enhanced visible light photocatalytic degradation

Science.gov (United States)

Wan, Hengcheng; Yao, Weitang; Zhu, Wenkun; Tang, Yi; Ge, Huilin; Shi, Xiaozhong; Duan, Tao

2018-06-01

SiO2@TiO2 yolk@shell hollow nanospheres (STNSs) is considered as an outstanding photocatalyst due to its tunable structure and composition. Based on this point, we present an unprecedentedly excellent photocatalytic property of STNSs toward tannic acid via a Fe-N co-doped strategy. Their morphologies, compositions, structure and properties are characterized. The Fe-N co-doped STNSs formed good hollow yolk@shell structure. The results show that the energy gap of the composites can be downgraded to 2.82 eV (pure TiO2 = 3.2 eV). Photocatalytic degradation of tannic acid (TA, 30 mg L-1) under visible light (380 nm TiO2 nanospheres, non-doped STNSs and N-doped STNSs, the Fe-N co-doped STNSs exhibits the highest activity, which can degrade 99.5% TA into CO2 and H2O in 80 min. The probable degradation mechanism of the composites is simultaneously proposed, the band gap of STNSs becomes narrow by co-doping Fe-N, so that the TiO2 shell can stimulate electrons under visible light exposure, generate the ions of radOH and radO2- with a strong oxidizing property. Therefore this approach works is much desired for radioactive organic wastewater photocatalytic degradation.

Heterostructured Fe3O4/Bi2O2CO3 photocatalyst: Synthesis, characterization and application in recyclable photodegradation of organic dyes under visible light irradiation

International Nuclear Information System (INIS)

Zhu, Gangqiang; Hojamberdiev, Mirabbos; Katsumata, Ken-ichi; Cai, Xu; Matsushita, Nobuhiro; Okada, Kiyoshi; Liu, Peng; Zhou, Jianping

2013-01-01

Heterostructured Fe 3 O 4 /Bi 2 O 2 CO 3 photocatalyst was synthesized by a two-step method. First, Fe 3 O 4 nanoparticles with the size of ca. 10 nm were synthesized by chemical method at room temperature and then heterostructured Fe 3 O 4 /Bi 2 O 2 CO 3 photocatalyst was synthesized by hydrothermal method at 180 °C for 24 h with the addition of 10 wt% Fe 3 O 4 nanoparticles into the precursor suspension of Bi 2 O 2 CO 3 . The pH value of synthesis suspension was adjusted to 4 and 6 with the addition of 2 M NaOH aqueous solution. By controlling the pH of synthesis suspension at 4 and 6, sphere- and flower-like Fe 3 O 4 /Bi 2 O 2 CO 3 photocatalysts were obtained, respectively. Both photocatalysts demonstrate superparamagnetic behavior at room temperature. The UV–vis diffuse reflectance spectra of the photocatalysts confirm that all the heterostructured photocatalysts are responsive to visible light. The photocatalytic activity of the heterostructured photocatalysts was evaluated for the degradation of methylene blue (MB) and methyl orange (MO) in aqueous solution over the photocatalysts under visible light irradiation. The heterostructured photocatalysts prepared in this study exhibit highly efficient visible-light-driven photocatalytic activity for the degradation of MB and MO, and they can be easily recovered by applying an external magnetic field. - Highlights: • Sphere- and flower-like Fe 3 O 4 /Bi 2 O 2 CO 3 was synthesized by hydrothermal method. • Fe 3 O 4 nanoparticles with the size of ca. 10 nm were synthesized by chemical method. • Photocatalysts demonstrate superparamagnetic behavior at room temperature. • Photocatalysts exhibit highly efficient visible-light-driven photocatalytic activity. • Photocatalysts can be easily recovered by applying an external magnetic field

Meso-porous α-Fe2O3 thin films synthesized via the sol-gel process for light-driven water oxidation

International Nuclear Information System (INIS)

Hamd, Wael; Laberty-Robert, Christel; Sanchez, Clement; Cobo, Saioa; Fize, Jennifer; Artero, Vincent; Baldinozzi, Gianguido; Schwartz, Wilfrid; Reymermier, Maryse; Pereira, Alexandre; Fontecave, Marc

2012-01-01

This work reports a facile and cost-effective method for synthesizing photoactive α-Fe 2 O 3 films as well as their performances when used as photoanodes for water oxidation. Transparent α-Fe 2 O 3 meso-porous films were fabricated by template-directed sol-gel chemistry coupled with the dip-coating approach, followed by annealing at various temperatures from 350 degrees C to 750 degrees C in air. α-Fe 2 O 3 films were characterized by X-ray diffraction, XPS, FE-SEM and electrochemical measurements. The photoelectrochemical performance of α-Fe 2 O 3 photoanodes was characterized and optimized through the deposition of Co-based co-catalysts via different methods (impregnation, electro-deposition and photo-electro-deposition). Interestingly, the resulting hematite films heat-treated at relatively low temperature (500 degrees C), and therefore devoid of any extrinsic dopant, achieve light-driven water oxidation under near-to-neutral (pH = 8) aqueous conditions after decoration with a Co catalyst. The onset potential is 0.75 V vs. the reversible hydrogen electrode (RHE), thus corresponding to 450 mV light-induced under potential, although modest photocurrent density values (40 μAcm -2 ) are obtained below 1.23 V vs. RHE. These new materials with a very large interfacial area in contact with the electrolyte and allowing for a high loading of water oxidation catalysts open new avenues for the optimization of photo-electrochemical water splitting. (authors)

Organic and inorganic carbon dynamics in a karst aquifer: Santa Fe River Sink-Rise system, north Florida, USA

Science.gov (United States)

Jin, Jin; Zimmerman, Andrew R.; Moore, Paul J.; Martin, Jonathan B.

2014-03-01

Spatiotemporal variations in dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), major ions concentrations and other geochemical parameters including stable carbon isotopes of DIC (δ13CDIC), were measured in surface water and deep and shallow well water samples of the Santa Fe River Sink-Rise eogenetic karst system, north Florida, USA. Three end-member water sources were identified: one DOC-rich/DIC-poor/δ13CDIC-depleted, one DOC-poor/DIC-rich/δ13CDIC-enriched, and one enriched in major ions. Given their spatiotemporal distributions, they were presumed to represent soil water, upper aquifer groundwater, and deep aquifer water sources, respectively. Using assumed ratios of Na+, Cl, and SO42- for each end-member, a mixing model calculated the contribution of each water source to each sample. Then, chemical effects of biogeochemical reactions were calculated as the difference between those predicted by the mixing model and measured species concentrations. In general, carbonate mineral dissolution occurred throughout the Sink-Rise system, surface waters were net autotrophic and the subsurface was in metabolic balance, i.e., no net DOC or DIC production or consumption. However, there was evidence for chemolithoautotrophy, perhaps by hydrogen oxidizing microbes, at some deep aquifer sites. Mineralization of this autochthonous natural dissolved organic matter (NDOM) led to localized carbonate dissolution as did surface water-derived NDOM supplied to shallow well sites during the highest flow periods. This study demonstrates linkages between hydrology, abiotic and microbial processes and carbon dynamics and has important implications for groundwater quality, karst morphologic evolution, and hydrogeologic projects such as aquifer storage and recovery in karst systems.

Resenha do livro: 'The Revolutions of 1893 in the Province of Santa F e Argentina'

Directory of Open Access Journals (Sweden)

Antônio E. Muniz Barreto

1977-03-01

Full Text Available (primeiro parágrafo do texto Ezequiel Gallo, conhecido historiador argentino, diretor do Instituto Torcuato Di Tella, assíduo colaborador da revista Desarrollo Economico e antigo membro do Instituto de Estudos Latino-Americanos da Universidade de Londres, acrescentou nesta monografia mais uma pesquisa, publicada na Inglaterra pelo Instituto acima mencionado, sobre a história de seu país. O estudo é desenvolvido a partir da sua tese de Doutor, Agricultural Colonization and Society in Argentina. The Province of Santa Fe, 1870-1895, apresentada em Oxford em 1970.

Sm2FeTaO7 Photocatalyst for Degradation of Indigo Carmine Dye under Solar Light Irradiation

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Leticia M. Torres-Martínez

2012-01-01

Full Text Available This paper is focused to study Sm2FeTaO7 pyrochlore-type compound as solar photocatalyst for the degradation of indigo carmine dye in aqueous solution. Sm2FeTaO7 was synthesized by using conventional solid state reaction and sol-gel method. X-ray diffraction results indicated that Sm2FeTaO7 exhibit a monoclinic crystal structure. By scanning electron microscopy analysis, it was observed that sol-gel material presents particle size of around 150 nm. The specific surface area and energy bandgap values were 12 m2 g−1 and 2.0 eV, respectively. The photocatalytic results showed that indigo carmine molecule can be degraded under solar light irradiation using the synthesized materials, sol-gel photocatalyst was 8 times more active than solid state. On the other hand, when Sm2FeTaO7 was impregnated with CuO as cocatalyst the photocatalytic activity was increased because CuO acts as electron trap decreasing electron-hole pair recombination rates.

Las masas de aire que afectan el sur de la provincia de Santa Fe y su relación con la precipitación diaria en enero Classification of air masses that affect the south of Santa Fe, their trajectories and the relationship between them to the the daily precipitation in January abstract

Directory of Open Access Journals (Sweden)

Alejandra S. Coronel

2010-06-01

Full Text Available El objetivo del trabajo es identificar las masas de aire que afectan el sur de Santa Fe durante los eneros de 1998-2006 y relacionarlas con la precipitación diaria, tomando como estación representativa a Zavalla (33º01´S, 60º53´O. La información diaria analizada es: temperaturas media, máxima y mínima, humedad relativa, heliofanía efectiva, presión atmosférica, precipitación y dirección de viento a las 8 y 14 horas local, campos de altura geopotencial en 1000 y 500 hPa, de temperatura en 1000 hPa y de humedad específica en 850 hPa del NCEP. Se aplica el algoritmo K-means y se identifican cuatro tipos de masas de aire: Cálida Seca (mCS: muy cálida; Cálida Húmeda (mCH: aumenta significativamente la humedad y la nubosidad respecto a mCS; Templada Seca (mTS: menores temperaturas mínimas; Templada Húmeda (mTH: muy húmeda, y bajas amplitudes térmicas diarias, asociada a condiciones previas al pasaje de frentes fríos. El 50% de días lluviosos ocurren durante mCH y el 32% con mTH, y el 93% de las más intensas acontecen durante el predominio de dichas masas. Las mTH tienen mayor eficiencia en la ocurrencia de precipitación pues en el 50% de los casos precipita, y para las mCH solo en el 27%.The aim of this work is to identify the air masses that affect the south of Santa Fe in January during 1998-2006 and to relate it to the daily precipitation, in Zavalla (33º01´S, 60º53´O. The analyzed daily information is: mean, maximum and minimum temperature, relative humidity, effective insolation, atmospheric pressure, precipitation and wind direction of the 8 and 14 hours. The fields of circulation and temperature in 1000 and 500 hPa, and specific humidity in 850 hPa, are calculated using NCEP Reanálisis data. Analysis of cluster k-means is applied and it determines four types of air masses: Warm Drought: a very warm air mass; Warm Humid: it increases the humidity and cloudiness, Moderate Dry: air mass with the smallest minimum

The Infrared Light Curve of SN 2011fe in M101 and the Distance to M101

OpenAIRE

Matheson, T.; Joyce, R. R.; Allen, L. E.; Saha, A.; Silva, D. R.; Wood-Vasey, W. M.; Adams, J. J.; Anderson, R. E.; Beck, T. L.; Bentz, M. C.; Bershady, M. A.; Binkert, W. S.; Butler, K.; Camarata, M. A.; Eigenbrot, A.

2012-01-01

We present near infra-red light curves of supernova (SN) 2011fe in M101, including 34 epochs in H band starting fourteen days before maximum brightness in the B-band. The light curve data were obtained with the WIYN High-Resolution Infrared Camera (WHIRC). When the data are calibrated using templates of other Type Ia SNe, we derive an apparent H-band magnitude at the epoch of B-band maximum of 10.85 \\pm 0.04. This implies a distance modulus for M101 that ranges from 28.86 to 29.17 mag, depend...

Photoionization of FE3+ Ions

International Nuclear Information System (INIS)

Ovchinnikov, O.; Schlachter, F.

2003-01-01

Photoionization of Fe3+ ions was studied for the first time using synchrotron radiation from the Advanced Light Source (ALS) and the merged-beams technique. Fe3+ ions were successfully produced using ferrocene in an electron cyclotron resonance ion source (ECR). The measured yield of Fe4+ photoions as a function of photon energy revealed the presence of resonances that correspond to excitation of autoionizing states. These resonances are superimposed upon the photoion yield produced by direct photoionization, which is a smooth, slowly decreasing function of energy. The spectra for the photoionization of Fe3+ will be analyzed and compared with theory. The data collected will also serve to test models for the propagation of light through ionized matter.

Santa Rosa de Lima: uma santa anoréxica na América Latina? Santa Rosa de Lima: ¿una santa anoréxica en Latinoamérica? Saint Rose of Lima: an anorexic saint in Latin America?

Directory of Open Access Journals (Sweden)

Cybelle Weinberg

2005-04-01

Full Text Available A literatura especializada tem nos mostrado que é grande a semelhança entre o comportamento alimentar das santas jejuadoras medievais e o das anoréxicas atuais. No entanto, há poucas referências sobre a existência de santas jejuadoras na América Latina. No presente trabalho, os autores salientam aspectos da vida de Santa Rosa de Lima, Patrona da América e Filipinas, que poderiam ser descritos como comportamentos anoréxicos. Comparando os aspectos psicopatológicos da vida de Santa Rosa com o comportamento das anoréxicas atuais, pareceu confirmar-se um padrão uniforme de comportamento, especialmente quanto ao aspecto imitativo, fator que poderia levar as jovens da atualidade a desenvolverem um transtorno alimentar após terem algum tipo de informação sobre o transtorno.La literatura especializada nos muestra gran similitud entre el comportamiento alimentar de las santas de la edad media que ayunaban y el de las anoréxicas de la actualidad. Hay pocas informaciones sobre santas que practicaban ayuno en Latinoamérica. En este artículo, los autores resaltan aspectos de la vida de santa Rosa de Lima, Patrona de América y Filipinas, que pueden ser considerados como comportamientos anoréxicos. Al comparar aspectos psicopatológicos de la vida de santa Rosa con el comportamiento de anoréxicas de la actualidad, parece que se confirma un modelo uniforme de comportamiento, especialmente respecto al aspecto de imitación, hecho que podría llevar a las jóvenes de hoy a desarrollar un trastorno de la alimentación luego de recibir informaciones sobre el tema.The specialized literature has shown us the great similarity between the eating habits of medieval fasting women saints and today's anorexic women. Nonetheless, there are few references to the existence of such fasting women saints in Latin America. The authors of this paper present some aspects of the life of Saint Rose of Lima, the patroness of the Americas and the Philippines, that

THE DETAILED CHEMICAL PROPERTIES OF M31 STAR CLUSTERS. I. Fe, ALPHA AND LIGHT ELEMENTS

Energy Technology Data Exchange (ETDEWEB)

Colucci, Janet E.; Bernstein, Rebecca A. [The Observatories of the Carnegie Institution for Science, 813 Santa Barbara St., Pasadena, CA 91101 (United States); Cohen, Judith G., E-mail: jcolucci@obs.carnegiescience.edu [Palomar Observatory, Mail Stop 105-24, California Institute of Technology, Pasadena, CA 91125 (United States)

2014-12-20

We present ages, [Fe/H] and abundances of the α elements Ca I, Si I, Ti I, Ti II, and light elements Mg I, Na I, and Al I for 31 globular clusters (GCs) in M31, which were obtained from high-resolution, high signal-to-noise ratio >60 echelle spectra of their integrated light (IL). All abundances and ages are obtained using our original technique for high-resolution IL abundance analysis of GCs. This sample provides a never before seen picture of the chemical history of M31. The GCs are dispersed throughout the inner and outer halo, from 2.5 kpc < R {sub M31} < 117 kpc. We find a range of [Fe/H] within 20 kpc of the center of M31, and a constant [Fe/H] ∼ – 1.6 for the outer halo clusters. We find evidence for at least one massive GC in M31 with an age between 1 and 5 Gyr. The α-element ratios are generally similar to the Milky Way GC and field star ratios. We also find chemical evidence for a late-time accretion origin for at least one cluster, which has a different abundance pattern than other clusters at similar metallicity. We find evidence for star-to-star abundance variations in Mg, Na, and Al in the GCs in our sample, and find correlations of Ca, Mg, Na, and possibly Al abundance ratios with cluster luminosity and velocity dispersion, which can potentially be used to constrain GC self-enrichment scenarios. Data presented here were obtained with the HIRES echelle spectrograph on the Keck I telescope.

Removal of PFOA in groundwater by Fe0 and MnO2 nanoparticles under visible light.

Science.gov (United States)

Liu, Jia; Weinholtz, Lindsey; Zheng, Linan; Peiravi, Meisam; Wu, Yan; Chen, Da

2017-09-19

The main objective of this study was to find a cost-effective, efficient and environmentally-friendly solution to remove perfluorooctanic acid (PFOA) from groundwater by using Fe 0 and MnO 2 nanoparticles. The selected method was expected to be applicable to the remediation of PFOA-contaminated groundwater. Phytotoxicity of the nanoparticle treatment was studied to demonstrate the safe application of the nanomaterials. Zero-valent Fe (100 mg L -1 ) and MnO 2 (100 mg L -1 ) nanoparticles, produced in our lab, were used to remove PFOA up to 10 mg L -1 . The test was conducted under visible light with or without addition of 0.88 mol L -1 H 2 O 2 in a pH range of 0.5-11.0 for a duration of 18 h. Using Fe nanoparticles, a higher percentage of PFOA was removed under extreme acidic environment of pH 0.5 than under the basic environment of pH 11.0, and a minimum removal rate was reached under the neutral environment. The Fe nanoparticles were more efficient than the MnO 2 nanoparticles at pH 0.5 with a removal rate of 69.7% and 89.7% without and with H 2 O 2 addition, respectively. Phytotoxicity study showed that the treatment by Fe nanoparticles under mild pH reduced the phytotoxicity of groundwater-associated PFOA to Arabidopsis thaliana. The Fe nanoparticles did not show negative effect to A. thaliana under the experimental conditions used in this study.

Photocatalytic degradation of methylene blue on magnetically separable MgFe2O4 under visible light irradiation

KAUST Repository

Shahid, Muhammad

2013-05-01

A magnetically separable single-phase MgFe2O4 photocatalyst with a spinel crystal structure was synthesized by using the solid-state reaction method. The formation of spinel structure is confirmed by X-ray diffraction and Fourier transform infrared spectroscopy. The magnetic measurements showed that the photocatalyst material can be separated from water when an external magnetic field is added and redispersed into water solution after the external magnetic field is eliminated. It is one of the promising photocatalysts for waste water treatment. The photocatalytic activity of MgFe2O4 was investigated by using the photo-decomposition of methylene blue dye under visible light. The photoelectrochemical property of the MgFe2O4 was studied by measuring their photocurrent-potential behavior in 1 M NaOH electrolyte under AM 1.5100 mW cm-2 illumination. © 2013 Elsevier B.V. All rights reserved.

Sandra Patricia Rodríguez Ávila. Sujeción, corrección y disciplina: pedagogía social de masas en Santa Fe de Bogotá 1780-1821

Directory of Open Access Journals (Sweden)

Juan Carlos Villamizar

2008-01-01

Full Text Available El libro ganador del vii Premio Nacional de Educación Francisca Radke, versión 2005-2006, se compone de una introducción y tres capítulos, en los que la autora se ocupa de las prácticas de sujeción, corrección y disciplina a finales del siglo xviii y comienzos del xix, en que la administración colonial llegó a su fin en América. Los dos primeros capítulos abordan la problemática de la pobreza y las propuestas de cómo tratarla. El tercer capítulo se ocupa de la pedagogía social de masas y de la asistencia, enseñanza y corrección de pobres, mendigos, vagos y malentretenidos en Santa Fe de Bogotá entre 1780 y 1820. A diferencia de los dos primeros capítulos, este último está construido estrictamente con fuentes primarias.

Facile synthesis of Sm-doped BiFeO{sub 3} nanoparticles for enhanced visible light photocatalytic performance

Energy Technology Data Exchange (ETDEWEB)

Hu, Zijun; Chen, Da, E-mail: dchen_80@hotmail.com; Wang, Sen; Zhang, Ning; Qin, Laishun, E-mail: qinlaishun@cjlu.edu.cn; Huang, Yuexiang

2017-06-15

Highlights: • Effective Sm doping into BiFeO{sub 3} nanoparticles was obtained by a facile sol-gel route. • Band gap of Sm-doped BiFeO{sub 3} nanoparticles was regulated by the dopant concentration. • Sm-doped BiFeO{sub 3} nanoparticles exhibited superior photocatalytic activities. • The possible photocatalytic mechanism of Sm-doped BiFeO{sub 3} nanospheres was discussed. - Abstract: In this work, the effect of Sm doping on the structural and photocatalytic properties of BiFeO{sub 3} (BFO) was investigated. A series of Sm doped BFO nanoparticles containing different Sm dopant contents (Bi{sub (1−x)}Sm{sub x}FeO{sub 3}, x = 0.00, 0.01, 0.03, 0.05, 0.07, 0.10) were synthesized via a simple sol-gel route. It was revealed that Sm{sup 3+} ions were successfully doped into BFO nanoparticles, and the band gap value was gradually decreased when increasing Sm dopant concentration. The photocatalytic activity of Sm-doped BFO photocatalyst was significantly affected by the Sm doping content. Compared to pure BFO, the Sm-doped BFO samples exhibited much higher photocatalytic activity. The improved photocatalytic activity of Sm-doped BFO could be attributed to the enhanced visible light absorption and the efficient separation of photogenerated electrons and holes derived from Sm dopant trapping level in the Sm-doped BFO samples. In addition, the possible photocatalytic mechanism of Sm-doped BFO photocatalyst was also proposed.

Ratio dependence of the visible light photocatalytic efficiency for Zn{sub 2}Ti{sub 0.9}Cr{sub y}Fe{sub [0.1-y]}O{sub 4}: Cr/Fe (0.02 < y < 0.08) photocatalyst synthesized by using a solid state reaction method

Energy Technology Data Exchange (ETDEWEB)

Borse, P. H. [International Advanced Research Center for Powder Metallurgy and New Materials, Hyderabad (India); Cho, C. R. [Pusan National University, Miryang (Korea, Republic of); Lim, K. T. [Pukyong National University, Busan (Korea, Republic of); Lee, Y. J.; Bae, J. S.; Jeong, E. D.; Kim, H. G. [Korea Basic Science Institute, Busan (Korea, Republic of)

2011-07-15

We synthesized four different photocatalyst systems of Zn{sub 2}TiO{sub 4}, Zn{sub 2}Ti{sub 1-x}Fe{sub x}O{sub 4}, Zn{sub 2}Ti{sub 1-x}Cr{sub x}O{sub 4} (0 {<=} x < 0.8) and Zn{sub 2}Ti{sub 0.9}Cr{sub y}Fe{sub [0.1]-y}O{sub 4} (0.02 < y < 0.08) by using a solid state reaction method. For the first time, the UV-active photocatalyst Zn{sub 2}TiO{sub 4} was converted to a visible light active material by controlled doping/co-doping with Cr and Fe metal-ions at Ti substitutional sites, and investigated the structural, optical and photocatalytic water decomposition properties of that materials. The co-doping induces strong absorption bands (at {lambda} {approx} 480 nm and {lambda} {approx} 620 nm) within the Zn{sub 2}TiO{sub 4} band gap. The optimum system of Zn{sub 2}Ti{sub 0.9}Cr{sub 0.05}Fe{sub 0.05}O{sub 4} yielded maximum H{sub 2} generation. In contrast to the visible light inactivity of Fe- and Cr-doped Zn{sub 2}TiO{sub 4}, the H{sub 2} production from co-doped samples under visible light irradiation increased till the optimum 'y' value. Consequently, here exists an optimal co-dopant concentration for efficient photocatalytic hydrogen production under visible light ({lambda} {>=} 420 nm).

Nonvolatile two-step, two-color holography with continuous-wave lights for both congruent and near-stoichiometric LiNbO3:Fe

International Nuclear Information System (INIS)

Shen Yan; Zhang Guoquan; Fu Bo; Xu Qingjun; Xu Jingjun

2004-01-01

We have studied theoretically the steady-state nonvolatile two-step, two-color holographic recording performance for both the congruent and the near-stoichiometric LiNbO 3 :Fe based on the two-center model (the deep-trap and the shallow-trap centers are Fe 2+ /Fe 3+ and Nb Li 4+ /Nb Li 5+ , respectively). The results show that the direct electron exchange between the Fe 2+ /Fe 3+ centers and the Nb Li 4+ /Nb Li 5+ centers due to the tunneling effect dominates the charge-transfer process during the nonvolatile two-step, two-color holography and determines the two-step, two-color holography performance in LiNbO 3 :Fe. We have further studied the effects of the crystal stoichiometry on the performance of the two-step, two-color holography. It is shown that, as far as the total space-charge field is considered, the nonvolatile two-step, two-color holography performance in the near-stoichiometric LiNbO 3 :Fe is much better than that in the congruent LiNbO 3 :Fe within the intensity range reachable by the continuous-wave lights

In-situ Density and Thermal Expansion Measurements of Fe and Fe-S Alloying Liquids Under Planetary Core Conditions

Science.gov (United States)

Jing, Z.; Chantel, J.; Yu, T.; Sakamaki, T.; Wang, Y.

2015-12-01

Liquid iron is likely the dominant constituent in the cores of terrestrial planets and icy satellites such as Earth, Mars, Mercury, the Moon, Ganymede, and Io. Suggested by geophysical and geochemical observations, light elements such as S, C, Si, etc., are likely present in planetary cores. These light elements can significantly reduce the density and melting temperature of the Fe cores, and hence their abundances are crucial to our understanding of the structure and thermal history of planetary cores, as well as the generation of intrinsic magnetic fields. Knowledge on the density of Fe-light element alloying liquids at high pressures is critical to place constraints on the composition of planetary cores. However, density data on liquid Fe-light element alloys at core pressures are very limited in pressure and composition and are sometimes controversial. In this study, we extend the density dataset for Fe-rich liquids by measuring the density of Fe, Fe-10wt%S, Fe-20wt%S, Fe-27wt%S, and FeS liquids using the X-ray absorption technique in a DIA-type multianvil apparatus up to 7 GPa and 2173 K. An ion chamber (1D-detector) and a CCD camera (2D-detector) were used to measure intensities of transmitted monochromatic X-rays through molten samples, with the photon energy optimized at 40 keV. The densities were then determined from the Beer-Lambert law using the mass absorption coefficients, calibrated by solid standards using X-ray diffraction. At each pressure, density measurements were conducted at a range of temperatures above the liquidus of the samples, enabling the determination of thermal expansion. Combined with our previous results on the sound velocity of Fe and Fe-S liquids at high pressures (Jing et al., 2014, Earth Planet. Sci. Lett. 396, 78-87), these data provide tight constraints on the equation of state and thermodynamic properties such as the adiabatic temperature gradient for Fe-S liquids. We will discuss these results with implications to planetary

THE INFRARED LIGHT CURVE OF SN 2011fe IN M101 AND THE DISTANCE TO M101

International Nuclear Information System (INIS)

Matheson, T.; Joyce, R. R.; Allen, L. E.; Saha, A.; Silva, D. R.; Binkert, W. S.; Butler, K.; Everett, M.; Wood-Vasey, W. M.; Adams, J. J.; Anderson, R. E.; Beck, T. L.; Bentz, M. C.; Bershady, M. A.; Eigenbrot, A.; Gallagher, J. S.; Camarata, M. A.; Garnavich, P. M.; Glikman, E.; Harbeck, D.

2012-01-01

We present near-infrared light curves of supernova (SN) 2011fe in M101, including 34 epochs in H band starting 14 days before maximum brightness in the B band. The light curve data were obtained with the WIYN High-Resolution Infrared Camera. When the data are calibrated using templates of other Type Ia SNe, we derive an apparent H-band magnitude at the epoch of B-band maximum of 10.85 ± 0.04. This implies a distance modulus for M101 that ranges from 28.86 to 29.17 mag, depending on which absolute calibration for Type Ia SNe is used.

THE INFRARED LIGHT CURVE OF SN 2011fe IN M101 AND THE DISTANCE TO M101

Energy Technology Data Exchange (ETDEWEB)

Matheson, T.; Joyce, R. R.; Allen, L. E.; Saha, A.; Silva, D. R.; Binkert, W. S.; Butler, K.; Everett, M. [National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719 (United States); Wood-Vasey, W. M. [Pittsburgh Particle Physics, Astrophysics, and Cosmology Center (PITT-PACC), University of Pittsburgh, 3941 O' Hara Street, Pittsburgh, PA 15260 (United States); Adams, J. J. [Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); Anderson, R. E.; Beck, T. L. [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States); Bentz, M. C. [Department of Physics and Astronomy, Georgia State University, Astronomy Offices, One Park Place South SE, Suite 700, Atlanta, GA 30303 (United States); Bershady, M. A.; Eigenbrot, A.; Gallagher, J. S. [Department of Astronomy, University of Wisconsin-Madison, 475 North Charter Street, Madison, WI 53706 (United States); Camarata, M. A. [Department of Physics, Southern Connecticut State University, 501 Crescent Street, New Haven, CT 06515 (United States); Garnavich, P. M. [Department of Physics, University of Notre Dame, Notre Dame, IN 46556 (United States); Glikman, E. [Department of Astronomy, Yale University, New Haven, CT 06511 (United States); Harbeck, D., E-mail: matheson@noao.edu [WIYN Observatory, 950 North Cherry Avenue, Tucson, AZ 85719 (United States); and others

2012-07-20

We present near-infrared light curves of supernova (SN) 2011fe in M101, including 34 epochs in H band starting 14 days before maximum brightness in the B band. The light curve data were obtained with the WIYN High-Resolution Infrared Camera. When the data are calibrated using templates of other Type Ia SNe, we derive an apparent H-band magnitude at the epoch of B-band maximum of 10.85 {+-} 0.04. This implies a distance modulus for M101 that ranges from 28.86 to 29.17 mag, depending on which absolute calibration for Type Ia SNe is used.

Ti-dopant-enhanced photocatalytic activity of a CaFe{sub 2}O{sub 4}/MgFe{sub 2}O{sub 4} bulk heterojunction under visible-light irradiation

Energy Technology Data Exchange (ETDEWEB)

Borse, Pramod H. [International Advanced Research Center for Powder Metallurgy and New Materials, Hyderabad (India); Kim, Jae Y.; Lee, Jae S. [Pohang University of Science and Technology, Pohang (Korea, Republic of); Lim, Kwon T. [Pukyong National University, Busan (Korea, Republic of); Jeong, Euh D.; Bae, Jong S.; Yoon, Jang H.; Yu, Seong M.; Kim, Hyun G. [Korea Basic Science Institute, Busan (Korea, Republic of)

2012-07-15

The effect substitution of Ti{sup 4+} at the Fe{sup 3+} site in a CaFe{sub 2}O{sub 4{sup -}}MgFe{sub 2}O{sub 4} bulk hetero-junction (BH) lattice photocatalyst was explored and the Ti ion concentration was optimized to fabricate an efficient photocatalyst. A BH consisting of an optimum dopant concentration (Ti{sup +4}) level of x = 0.03 exhibited an increased band gap and generated a 1.5 times higher photocurrent. The newly fabricated Ti ion doped photocatalyst showed an enhanced quantum yield (up to ∼13.3%) for photodecomposition of a H{sub 2}O-CH{sub 3}OH mixture, as compared to its undoped BH counterpart under visible light (λ ≥ 420 nm). In contrast, the material doped with a very high Ti-dopant concentration displayed deteriorated photochemical properties. An efficient charge-separation induced by Ti-ion doping seems to be responsible for the higher photocatalytic activity in a doped bulk BH.

A facile approach to pure-phase Bi{sub 2}Fe{sub 4}O{sub 9} nanoparticles sensitive to visible light

Energy Technology Data Exchange (ETDEWEB)

Wang, X., E-mail: xiongwang@njust.edu.cn [School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094 (China); Department of Chemistry, Faculty of Science, National University of Singapore, 3 Science Drive 3, 117543 (Singapore); Zhang, M.; Tian, P. [School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094 (China); Chin, W.S. [Department of Chemistry, Faculty of Science, National University of Singapore, 3 Science Drive 3, 117543 (Singapore); Zhang, C.M. [School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094 (China)

2014-12-01

Graphical abstract: - Highlights: • Pure-phase Bi{sub 2}Fe{sub 4}O{sub 9} nanoparticles were prepared by a facile and environmentally benign sol–gel method. • The multiband characteristic of the nanoparticles greatly expands the visible light absorption. • The visible-light-driven photocatalytic activity of the obtained nanoparticles was improved by 30-fold as compared to the bulk. - Abstract: Pure-phase Bi{sub 2}Fe{sub 4}O{sub 9} nanoparticles with mullite-type structure were successfully fabricated through a facile and environmentally benign sol–gel process. According to the UV–Vis diffuse reflection spectrum, the multiband structure and the band edge position of the nanoparticles were confirmed, indicating the prominent absorption in the expanded visible-light region. As compared to the bulk, the visible-light-driven photocatalytic activity of the obtained nanoparticles was improved by 30-fold. The much improved photocatalytic efficiency of the sample mainly owed to the small crystal size and the multiband characteristic as well as the adding of H{sub 2}O{sub 2} as electron scavenger and a source of hydroxide free radicals instead of Fenton-like reaction, leading to a low recombination of the photogenerated e{sup −}/h{sup +} pairs.

Synthesis and photocatalytic degradation study of methylene blue dye under visible light irradiation by Fe1-xBixVO4 solid solutions (0 ≤ x ≤ 1.0)

Science.gov (United States)

Bera, Ganesh; Reddy, V. R.; Mal, Priyanath; Das, Pradip; Turpu, G. R.

2018-05-01

The novel hetero-structures Fe1-xBixVO4 solid solutions (0 ≤ x ≤ 1.0) with the two dissimilar end member of FeVO4 - BiVO4, were successfully synthesized by the standard solid state reaction method. The structural and chemical properties of as prepared photo-catalyst samples were characterized by X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FT-IR) and UV-visible absorption spectroscopy techniques. It is confirmed from the results of XRD, Raman and FT-IR that FeVO4 and BiVO4 are in triclinic (space group P-1 (2)) and monoclinic (space group I2/b (15)) phases respectively. The Bi incorporation into Fe site of FeVO4 emerges as hetero-structures of both the end members of the solid solutions. In addition, the photocatalytic activity in the degradation of methylene blue (MB) dye under visible light irradiation was carried out through UV-visible spectroscopy measurement of photo-catalysts FeVO4, BiVO4 and mixed phases of both photo-catalyst. The results indicate that under visible light irradiation the photocatalytic activity of mixed phases were very effective and higher than the both single phases of the solid solutions. The composition x= 0.25 exhibits an excellent photocatalytic property for the degradation of MB solution under visible light irradiation rather than other.

Synergistic photocatalysis of Cr(VI) reduction and 4-Chlorophenol degradation over hydroxylated α-Fe{sub 2}O{sub 3} under visible light irradiation

Energy Technology Data Exchange (ETDEWEB)

Wang, Ji-Chao; Ren, Juan [College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450002 (China); Yao, Hong-Chang, E-mail: yaohongchang@zzu.edu.cn [College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450002 (China); Zhang, Lin; Wang, Jian-She; Zang, Shuang-Quan [College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450002 (China); Han, Li-Feng [Henan Provincial Key Laboratory of Surface & Interface Science, Zhengzhou University of Light Industry, Zhengzhou 450002 (China); Li, Zhong-Jun, E-mail: lizhongjun@zzu.edu.cn [College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450002 (China)

2016-07-05

Highlights: • The surface hydroxyl of Fe{sub 2}O{sub 3} influences on the Cr(VI) reduction activity. • The synergistic photocatalysis enhances degradation activity of Cr(VI) and 4-CP. • The Fe{sub 2}O{sub 3} catalyst exhibits good stability and degradation activity after 9 runs. - Abstract: A series of Fe{sub 2}O{sub 3} materials with hydroxyl are synthesized in different monohydric alcohol (C{sub 2} – C{sub 5}) solvents by solvothermal method and characterized by XRD, BET, XPS, TG and EA. The amount of hydroxyl is demonstrated to be emerged on the surface of the as-synthesized Fe{sub 2}O{sub 3} particles and their contents are determined to be from 7.99 to 3.74 wt%. The Cr(VI) reduction experiments show that the hydroxyl content of Fe{sub 2}O{sub 3} samples exacts great influence on the photocatalytic activity under visible light irradiation (λ > 400 nm) and that the Fe{sub 2}O{sub 3} sample synthesized in n-butyl alcohol exhibits the optimal photocatalytic activity. The synergistic photocatalysis for 4-Chlorophenol (4-CP) degradation and Cr(VI) reduction over above Fe{sub 2}O{sub 3} sample is further investigated. The photocatalytic ratio of Cr(VI) reduction are enhanced from 24.8% to 70.2% while that of 4-CP oxidation are increased from 13.5% to 47.8% after 1 h visible light irradiation. The Fe{sub 2}O{sub 3} sample keeps good degradation rates of mixed pollutants after 9 runs. The active oxygen intermediates O{sub 2}{sup −}·, ·OH and H{sub 2}O{sub 2} formed in the photoreaction process are discovered by ESR measurement and UV–vis test. The photocatalytic degradation mechanism is proposed accordingly.

Synthesis of novel magnetic iron metal-silica (Fe-SBA-15) and magnetite-silica (Fe{sub 3}O{sub 4}-SBA-15) nanocomposites with a high iron content using temperature-programed reduction

Energy Technology Data Exchange (ETDEWEB)

Yiu, H H P [Department of Chemistry, University of Liverpool, Liverpool, Merseyside L69 7ZD (United Kingdom); Keane, M A [Chemical Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom); Lethbridge, Z A D [Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL (United Kingdom); Lees, M R [Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL (United Kingdom); Haj, A J El; Dobson, J [Institute of Science and Technology in Medicine, Keele University, Thornburrow Drive, Hartshill, Stoke-on-Trent ST4 7QB (United Kingdom)], E-mail: j.p.dobson@keele.ac.uk

2008-06-25

Magnetic iron metal-silica and magnetite-silica nanocomposites have been prepared via temperature-programed reduction (TPR) of an iron oxide-SBA-15 (SBA: Santa Barbara Amorphous) composite. TPR of the starting SBA-15 supported Fe{sub 2}O{sub 3} generated Fe{sub 3}O{sub 4} and FeO as stepwise intermediates in the ultimate formation of Fe-SBA-15. The composite materials have been characterized by means of x-ray diffraction, high resolution transmission electron microscopy and SQUID (superconducting quantum interference device) magnetometry. The Fe oxide and metal components form a core, as nanoscale particles, that is entrapped in the SBA-15 pore network. Fe{sub 3}O{sub 4}-SBA-15 and Fe-SBA-15 exhibited superparamagnetic properties with a total magnetization value of 17 emu g{sup -1}. The magnetite-silica composite (at an Fe{sub 3}O{sub 4} loading of 30% w/w) delivered a magnetization that exceeded values reported in the literature or obtained with commercial samples. Due to the high pore volume of the mesoporous template, the magnetite content can be increased to 83% w/w with a further enhancement of magnetization.

“Santísima Muerte, Vístete de Negro, Santísima Muerte, Vístete de Blanco”: La Santa Muerte’s Illegal Marginalizations

Directory of Open Access Journals (Sweden)

Desirée A. Martín

2017-03-01

Full Text Available La Santísima Muerte, the death saint patron of the marginalized and dispossessed in Mexico, the United States, and beyond, is especially favored by devotees who identify with her duality between dark and light, and good and evil. Most of Santa Muerte’s devotees understand that good and evil coexist in her, and they often simultaneously appeal to both. At the same time, illegality and marginalization, which are generally associated with the saint’s “dark” or “evil” sides, take on multiple, diverse forms, encompassing criminalized activity such as narcotrafficking, religious transgressions that reflect unorthodox spiritual practices such as witchcraft, and most contentiously of all, the very conditions of poverty and racialization in Mexico. Nevertheless, cultural representations of Santa Muerte often resist such diversity and persist in opposing her dark and light sides. Films such as Eva Aridjis’s La Santa Muerte and Pável Valenzuela Arámburo’s La Santísima Muerte aim to represent all Santa Muerte in all of her multiplicity and to correct stereotypical representations of the death saint in general. But perhaps inadvertently, Aridjis’s film reinforces the contrast, rather than the intersections, between “light” and “dark”. However, in La Santísima Muerte, Valenzuela Arámburo deliberately embraces the saint’s contradictory duality to provide a different perspective on illegality and criminality, simultaneously accepting such illegality as a dark menace in the vein of Santa Muerte’s typical detractors, and rearticulating it as a necessary aspect of the saint’s holy works. Valenzuela Arámburo’s film not only emphasizes that the very same devotees invoke Santa Muerte for her powers of “good” as well as for those of “evil”, it demonstrates that these devotees incorporate the saint’s dark side as they see fit not as a consequence of their marginalized status, but as a means to resist it. Thus, while

Facile one-pot construction of α-Fe{sub 2}O{sub 3}/g-C{sub 3}N{sub 4} heterojunction for arsenic removal by synchronous visible light catalysis oxidation and adsorption

Energy Technology Data Exchange (ETDEWEB)

Sun, Suwen; Ji, Chunnuan, E-mail: 1842355613@qq.com; Wu, Lingling; Chi, Shenghua; Qu, Rongjun; Li, Yan; Lu, Yangxiao; Sun, Changmei; Xue, Zhongxin

2017-06-15

α-Fe{sub 2}O{sub 3}/g-C{sub 3}N{sub 4} composites with heterojunction were prepared by facile one-pot synthesis using ferric chloride and dicyandiamide as precursors. The newly formed composites were applied to remove arsenic from aqueous solution for the first time through synchronous visible light catalysis oxidation and adsorption. α-Fe{sub 2}O{sub 3}/g-C{sub 3}N{sub 4} composites were characterized by wide-angle X-ray powder diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, UV–Vis diffuse reflectance spectroscopy, and BET surface analysis. Under visible light irradiation, As(III) was oxidized to As(V) efficiently on the surface of α-Fe{sub 2}O{sub 3}/g-C{sub 3}N{sub 4}. In addition, the oxidized arsenic could be adsorbed in situ, resulting in the effective arsenic removal. The enhancement of photocatalytic activity the composites was attributed to the construction of heterojunction between α-Fe{sub 2}O{sub 3} and g-C{sub 3}N{sub 4}. A possible oxidation mechanism of the as-composites for As(III) under visible light irradiation was also elucidated. - Highlights: • α-Fe{sub 2}O{sub 3}/g-C{sub 3}N{sub 4} composites with heterojunction was prepared by facile one-pot synthesis. • The photocatalytic activity of α-Fe{sub 2}O{sub 3}/g-C{sub 3}N{sub 4} composites under visible light irradiation for As(III) was evaluated. • Synchronous visible light catalysis oxidation and adsorption were achieved for the removal of arsenic. • The reasonable oxidation mechanism of the composites for As(III) under visible light irradiation was investigated.

Integration& Operation of a Microgrid at Santa Rita Jail

Energy Technology Data Exchange (ETDEWEB)

Chevron Energy Solutions; Alameda County; DeForest, Nicholas; Lai, Judy; Stadler, Michael; Mendes, Goncalo; Marnay, Chris; Donadee, Jon

2011-05-01

Santa Rita Jail is a 4,500 inmate facility located in Dublin CA, approximately 40 miles (65 km) east of San Francisco. Over the past decade, a series of Distributed Energy Resources (DER) installations and efficiency measures have been undertaken to transform the 3MW facility into a"Green Jail". These include a 1.2MW rated rooftop PV system installed in 2002, a 1MW molten carbonate fuel cell with CHP, and retrofits to lighting and HVAC systems to reduce peak loads. With the upcoming installation of a large-scale battery and fast static disconnect switch, Santa Rita Jail will become a true microgrid, with full CERTS Microgrid functionality. Consequently, the jail will be able to seamlessly disconnect from the grid and operate as an island in the event of a disturbance, reconnecting again once the disturbance has dissipated. The extent to which that jail is capable of islanding is principally dependant on the energy capacity of the battery-one focus of this investigation. Also presented here are overviews of the DER currently installed at the jail, as well as the value it provides by offsetting the purchase of electricity under the current Pacific Gas& Electric (PG&E) tariff.

Arsenic content of soils from three regions of Santa Catarina State

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Leticia Cristina de Souza

2016-03-01

Full Text Available The determination of trace elements is necessary in order to monitor their entry into the soil system and to remediate contaminated areas. The purpose of this study was to determine the natural content of arsenic (As in soils of three regions of Santa Catarina State (SC: the Southern Plateau, the Metropolitan area and the Southern Coast. Arsenic content was obtained after digestion in a microwave oven, following the USEPA 3051 A protocol and quantification was made by atomic absorption spectrometry with electrothermal atomization. The results were analyzed by the Scott-Knott test at a 5% significance level. Soil attributes that best correlated with arsenic content were clay, organic carbon, cation exchange capacity and Al and Fe oxides. The arsenic levels are related to the source material and the slope of regional soils.

La imagen profesional del bibliotecario escolar la percepción de los directivos y la autopercepción de los bibliotecarios de las escuelas primarias de la ciudad de Rafaela, Santa Fe The School Librarian's Professional Image: The Perception of Headmasters and Self-Perceptions of Librarians in Primary Schools in The City of Rafaela, Santa Fe

Directory of Open Access Journals (Sweden)

Fabiana María Jaime

2012-12-01

Full Text Available Se analiza la imagen profesional del bibliotecario escolar desde la percepción de los directivos y la autopercepción de los bibliotecarios de las escuelas primarias de la ciudad de Rafaela, Santa Fe. De allí se desprenden, como objetivos específicos, analizar la formación profesional del bibliotecario, la imagen ante la sociedad, el rol específico actual, la comunicación con los directivos de escuela, el interés de estos por la función del bibliotecario escolar, la relación con toda la comunidad educativa y las políticas bibliotecarias que rigen el trabajo bibliotecario. Se trata de un estudio crítico descriptivo, con un enfoque cuantitativo. El procedimiento metodológico utilizado es el empírico-deductivo. El universo y la población de estudio, son diez escuelas de la ciudad de Rafaela con bibliotecarios de cargo oficial y título profesional. Se concluye que la imagen que los directivos poseen de los bibliotecarios escolares está desdibujada. Reconocen la capacidad profesional de los bibliotecarios escolares pero no les ofrecen el acompañamiento y las herramientas imprescindibles para desplegar su máximo potencial. Sin embargo, los bibliotecarios fortalecen esta imagen debilitada. De igual modo, la inestabilidad en la implementación de políticas bibliotecarias desde la institución escolar y la carencia de figura legal de bibliotecario escolar para el Estado no brindan oportunidad para reforzar la imagen profesional del bibliotecario escolar.This work examines the professional image of school librarian of the city of Rafaela, Santa Fe. Their specific objectives are to analyse the training of librarians, the image in society, the specific role today, the communication with school headmasters, their interest in the role of school librarian, the relationship with all the educational community and library policies governing library work. This is a critical descriptive and quantitative approach and a design field that extracts

PREPARATION AND VISIBLE LIGHT RESPONSIVE PHOTOCATALYTIC ACTIVITY OF Fe3O4/Ni-Al-Ce LDH/Bi2WO6 COMPOSITES

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Jiaqi Hao

Full Text Available Novel Fe3O4/Ni-Al-Ce LDH/Bi2WO6 composites were prepared through a hydrothermal method and co-precipitation method. The morphologies and structures of the photocatalysts were characterized by XRD, Raman, TEM, UV-vis-DRS, BET surface area and VSM techniques. The photocatalytic performances of the photocatalysts were investigated by the decolorization of methyl orange (MO under visible-light irradiation. The results showed that the Fe3O4/Ni-Al-Ce LDH/Bi2WO6 composites exhibited greater photocatalytic activities compared to pure Bi2WO6 and the Ni-Al-Ce LDH; the decolorization rate of MO was 87% within 60 min under visible-light irradiation. The decolorization efficiency of the composite material remained at 71% after 4 recycling runs, showing improved stability. Furthermore, the experimental results also showed that the photocatalytic reactions for the composites followed first-order reaction kinetics. Therefore, the Fe3O4/Ni-Al-Ce LDH/Bi2WO6 composites were photocatalysts with high efficiencies and stabilities for a photocatalytic reaction of an organic pollutant, and this study provides a new, effective method for the development of wastewater treatment.

Deposition of CdS nanoparticles on MIL-53(Fe) metal-organic framework with enhanced photocatalytic degradation of RhB under visible light irradiation

Science.gov (United States)

Hu, Longxing; Deng, Guihua; Lu, Wencong; Pang, Siwei; Hu, Xing

2017-07-01

A novel composite, CdS/MIL-53(Fe), was successfully fabricated via a facile solvothermal method and characterized with XRD, SEM, TEM, XPS, FT-IR and UV-vis DRS. The results showed that the fabrication was able to result in a good dispersion of CdS nanoparticles onto MIL-53(Fe). The photocatalytic activities of the as-synthesized composite were investigated through the degradation of Rhodamine B (RhB) in water under visible light irradiation. It was found that the composite prepared at the mass ratio of CdS to MIL-53(Fe) of 1.5:1 displayed the highest photocatalytic activity. An approximately 92.5% of photocatalytic degradation of RhB was achieved at 0.5 g/L of 1.5-CdS/MIL dosage, 10 mg/L of initial RhB concentration and 23 °C of reaction temperature under visible light irradiation. The RhB photocatalytic degradation followed well the first-order kinetics equation and the increased catalyst dosage and optimal initial RhB concentration were responsible for the enhanced photocatalytic degradation. Quenching tests revealed that the predominant free radicals in the CdS/MIL-(53)-RhBaq-visible light system was O2-rad ; nevertheless, h+ and rad OH also contributed to a certain degree. The enhanced photocatalytic performance was ascribed to the formation of heterojunction structure between CdS and MIL-53(Fe) which significantly suppressed the recombination of photogenerated electron-hole pairs. Moreover, the reusability of 1.5-CdS/MIL composite was also studied.

Synthesis of TCPP/ZnFe{sub 2}O{sub 4}@ZnO nanohollow sphere composite for degradation of methylene blue and 4-nitrophenol under visible light

Energy Technology Data Exchange (ETDEWEB)

Rabbani, Mahboubeh, E-mail: m_rabani@iust.ac.ir; Heidari-Golafzani, Mahdi; Rahimi, Rahmatollah

2016-08-15

In this study, ZnFe{sub 2}O{sub 4} nanohallow spheres were synthesized by hydrothermal method, then ZnFe{sub 2}O{sub 4}@ZnO core-shell was prepared by forming of ZnO nanoshell onto magnetic microspheres via sol–gel route. Finally, TCPP/ZnFe{sub 2}O{sub 4}@ZnO composite was synthesized through the immobilization of the meso-tetrakis(4-carboxyphenyl)porphyrin on ZnFe{sub 2}O{sub 4}@ZnO core-shell. The prepared photocatalysts were characterized by different techniques such as scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-ray fluorescence analysis (XRF), vibration sample magnetometery (VSM), Brunauer–Emmett–Teller (BET) model, UV–visible diffuse reflectance spectroscopy (DRS) and dynamic light scattering (DLS). The photocatalytic activity of prepared photocatalysts was evaluated for degradation of methylene blue, as an organic dye and 4-nitrophenol as an organic pollutant under visible LED light irradiation. The results illustrated that TCPP/ZnFe{sub 2}O{sub 4}@ZnO composite show better photodegradating behavior vs. methylene blue and 4-nitrophenol compared to ZnFe{sub 2}O{sub 4}@ZnO, pure ZnFe{sub 2}O{sub 4} and pure ZnO. - Highlights: • ZnFe{sub 2}O{sub 4} nanohallow spheres were synthesized by hydrothermal method. • ZnFe{sub 2}O{sub 4}@ZnO core-shell was prepared by forming of ZnO nanoshell. • ZnFe{sub 2}O{sub 4}@ZnO spheres was modified by immobilization of TCPP on their surface. • Photocatalytic activity of catalysts was tested for degradation of MB and 4-NP. • TCPP/ZnFe{sub 2}O{sub 4}@ZnO composite show better photodegradating behavior.

Visible-light driven photocatalytic degradation of methylene-violet by rGO/Fe{sub 3}O{sub 4}/ZnO ternary nanohybrid structures

Energy Technology Data Exchange (ETDEWEB)

Thangavel, Srinivas [Nanomaterials Research Lab ( NmRL ), Department of Nanoscience and Technology, Karunya University, Coimbatore 641 114, Tamil Nadu (India); Center of Excellence in Advanced Materials and Green Technologies, Department of Chemical Engineering and Material Science, Amrita Vishwa Vidyapeetham, Coimbatore 641 112, Tamil Nadu (India); Thangavel, Sakthivel [Nanomaterials Research Lab ( NmRL ), Department of Nanoscience and Technology, Karunya University, Coimbatore 641 114, Tamil Nadu (India); Department of Mechanical Engineering, Jeju National University, Jeju 690-756 (Korea, Republic of); Raghavan, Nivea [Nanomaterials Research Lab ( NmRL ), Department of Nanoscience and Technology, Karunya University, Coimbatore 641 114, Tamil Nadu (India); Krishnamoorthy, Karthikeyan [Department of Mechanical Engineering, Jeju National University, Jeju 690-756 (Korea, Republic of); Venugopal, Gunasekaran, E-mail: gunasekaran@karunya.edu [Nanomaterials Research Lab ( NmRL ), Department of Nanoscience and Technology, Karunya University, Coimbatore 641 114, Tamil Nadu (India); Solid State Electronics Lab, Research Institute of Electrical Communication, Tohoku University, Katahira, Sendai 980-8577 (Japan)

2016-04-25

A novel ternary nanohybrid structure was constructed with reduced graphene-oxide/iron-oxide/zinc-oxide (rGO/Fe{sub 3}O{sub 4}/ZnO) via a facile hydrothermal method. The structural, morphological and optical properties were explored using X-ray diffraction, scanning electron microscope (SEM) with energy dispersive spectra and photoluminescence (PL) studies. The functional groups of ternary nanohybrid were characterized by Fourier transform-infrared spectroscopy. SEM images confirm the presence of two-dimensional GO sheets, one dimensional Fe{sub 3}O{sub 4} and ZnO nanorods. The PL spectra showed the quenching effect which has been observed from the reduction of electron–hole recombination in hybrid. Degradation efficiency of this system was evaluated and compared with pure ZnO and Fe{sub 3}O{sub 4}/ZnO. Under visible light condition, the ternary nanohybrid has shown an excellent photocatalytic degradation of methylene-violet dye. The degradation efficiency of rGO/Fe{sub 3}O{sub 4}/ZnO was systematically analyzed by absorption spectra and total organic carbon removal techniques. Our experimental results will show the potential way for the development of futuristic rGO based nanohybrids as an effective photocatalytic materials for waste-water treatment and environmental remedial applications. - Graphical abstract: A new ternary nanohybrid has been constructed with 1D Fe{sub 3}O{sub 4}–ZnO and 2D rGO sheets to utilize as visible-light photocatalyst. Highly active photocatalyst has been prepared by a feasible hydrothermal approach. For the first time, rGO/Fe{sub 3}O{sub 4}/ZnO ternary nanohybrid exhibits a superior photocatalytic activity towards the degradation of methylene-violet (dye) and the same can be used for environmental remediation applications. - Highlights: • Ternary nanohybrid constructed with 1D ZnO, Fe{sub 3}O{sub 4} and 2D rGO. • Aggregation free rGO/Fe{sub 3}O{sub 4}/ZnO nanohybrid exhibits superior photocatalytic activity. • rGO boost up

Fe2O3/ZnO/ZnFe2O4 composites for the efficient photocatalytic degradation of organic dyes under visible light

Science.gov (United States)

Li, Xiaojuan; Jin, Bo; Huang, Jingwen; Zhang, Qingchun; Peng, Rufang; Chu, Shijin

2018-06-01

In this study, novel ternary Fe2O3/ZnO/ZnFe2O4 (ZFO) composites were successfully prepared through a simple hydrothermal reaction with subsequent thermal treatment. The as-prepared products were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) analysis, Barrett-Joyner-Halenda (BJH) measurement, and UV-vis diffuse reflectance spectroscopy (UV-vis DRS). The photocatalytic degradation of rhodamine B (Rh B) under visible light irradiation indicated that the ZFO composites calcined at 500 °C has the best photocatalytic activity (the photocatalytic degradation efficiency can reach up to 95.7% within 60 min) and can maintain a stable photocatalytic degradation efficiency for at least three cycles. In addition, the photocatalytic activity of ZFO composites toward dye decomposition follows the order cationic Rh B > anionic methyl orange. Finally, using different scavengers, superoxide and hydroxyl radicals were identified as the primary active species during the degradation reaction of Rh B.

Reciprocidades y gubernamentalidad tras la inserción del dispositivo religioso en cárceles de mediana y máxima seguridad de la provincia de Santa Fe (Argentina

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Mauricio Manchado

2016-05-01

Full Text Available En el presente trabajo indagaremos sobre la reconfiguración de las dinámicas institucionales en dos cárceles de la provincia de Santa Fe, Argentina, tras la inserción del dispositivo religiosoevangélico- pentecostal. Los casos serán las penitenciarías n° 3 —mediana seguridad— y n° 11 — máxima seguridad—, y nos interrogaremos sobre las relaciones de reciprocidad que el dispositivo religioso configura en el encierro, en cómo dichas relaciones definen nuevas estrategias de gobierno por parte del servicio penitenciario y de qué manera se rediseñan las relaciones de poder en el dispositivo carcelario. Abordaje comparativo que responde a la hipótesis de que el dispositivo religioso-evangélicopentecostal construye matrices comunes de ordenamiento social, funcionamiento y reciprocidades en el encierro pero, al mismo tiempo, consolida su funcionamiento a raíz de una identificación precisa de las necesidades y oportunidades de los sujetos según atraviesen situaciones de ingreso o egreso carcelario.

Dos visiones sobre la planificación regional en el final del auge desarrollista: las propuestas de orientación del crecimiento urbano (Santa Fe, Argentina, 1980

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Gisela Ariana Rausch

2013-12-01

Full Text Available El desarrollismo de la segunda posguerra -en sus diferentes vertientes- llevó a su máxima expresión el ideal moderno de instrumentalización de la naturaleza como vía del mejoramiento social. En Argentina (como en América Latina, se adoptarían una variedad de prescripciones surgidas, principalmente, de la Comisión Económica para América Latina (CEPAL, mientras la disciplina urbanística sufriría una transformación profunda de sus bases teóricas, produciéndose un pasaje del “Urbanismo” al “planeamiento”. Esto como correlato directo del pasaje de una concepción “jurisdiccional” del territorio de intervención, a otra concepción “regional”. A partir de ello, se expondrán dos propuestas de crecimiento urbano para la ciudad de Santa Fe, una asentada en el desarrollismo tecnocrático, que hizo énfasis en las infraestructuras como medio técnico de control de la naturaleza, y la otra, más híbrida y alternativa, que hizo foco en la especificidad geográfica y cultural santafesina.

Study of the Thermodynamics of Chromium(III) and Chromium(VI) Binding to Fe3O4 and MnFe2O4 nanoparticles

Science.gov (United States)

Luther, Steven; Brogfeld, Nathan; Kim, Jisoo; Parsons, J.G.

2013-01-01

Removal of chromium(III) or (VI) from aqueous solution was achieved using Fe3O4, and MnFe2O4 nanomaterials. The nanomaterials were synthesized using a precipitation method and characterized using XRD. The size of the nanomaterials was determined to be 22.4 ± 0.9 nm (Fe3O4) and 15.5 ± 0.5 nm (MnFe2O4). The optimal binding pH for chromium(III) and chromium(VI) were pH 6 and pH 3. Isotherm studies were performed, under light and dark conditions, to determine the capacity of the nanomaterials. The capacities for the light studies with MnFe2O4 and Fe3O4 were determined to be 7.189 and 10.63 mg/g, respectively, for chromium(III). The capacities for the light studies with MnFe2O4 and Fe3O4 were 3.21 and 3.46 mg/g, respectively, for chromium(VI). Under dark reaction conditions the binding of chromium(III) to the MnFe2O4 and Fe3O4 nanomaterials were 5.74 and 15.9 mg/g, respectively. The binding capacity for the binding of chromium(VI) to MnFe2O4 and Fe3O4 under dark reaction conditions were 3.87 and 8.54 mg/g, respectively. The thermodynamics for the reactions showed negative ΔG values, and positive ΔH values. The ΔS values were positive for the binding of chromium(III) and for chromium(VI) binding under dark reaction conditions. The ΔS values for chromium(VI) binding under the light reaction conditions were determined to be negative. PMID:23558081

The Detailed Chemical Properties of M31 Star Clusters. I. Fe, Alpha and Light Elements

Science.gov (United States)

Colucci, Janet E.; Bernstein, Rebecca A.; Cohen, Judith G.

2014-12-01

We present ages, [Fe/H] and abundances of the α elements Ca I, Si I, Ti I, Ti II, and light elements Mg I, Na I, and Al I for 31 globular clusters (GCs) in M31, which were obtained from high-resolution, high signal-to-noise ratio >60 echelle spectra of their integrated light (IL). All abundances and ages are obtained using our original technique for high-resolution IL abundance analysis of GCs. This sample provides a never before seen picture of the chemical history of M31. The GCs are dispersed throughout the inner and outer halo, from 2.5 kpc < R M31 < 117 kpc. We find a range of [Fe/H] within 20 kpc of the center of M31, and a constant [Fe/H] ~ - 1.6 for the outer halo clusters. We find evidence for at least one massive GC in M31 with an age between 1 and 5 Gyr. The α-element ratios are generally similar to the Milky Way GC and field star ratios. We also find chemical evidence for a late-time accretion origin for at least one cluster, which has a different abundance pattern than other clusters at similar metallicity. We find evidence for star-to-star abundance variations in Mg, Na, and Al in the GCs in our sample, and find correlations of Ca, Mg, Na, and possibly Al abundance ratios with cluster luminosity and velocity dispersion, which can potentially be used to constrain GC self-enrichment scenarios. Data presented here were obtained with the HIRES echelle spectrograph on the Keck I telescope. The data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.

Myxomycetes de Florianópolis (Santa Catarina - Brasil Myxomycetes of Florianópolis (State of Santa Catarina - Brazil

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Laise de Holanda Cavalcanti

1994-07-01

Full Text Available Considerando a inexistência de registros de ocorrência de Myxomycetes em Florianópolis, realizou- se coletas nas matas da Lagoa do Peri e Lagoa da Conceição, em 1990, assinalando-se as seguintes espécies : Lycogala exiguum Morg. (Enteridiaceae ; Cribraria languescem Rex, C. vulgaris Sclir. (Cribrariaceae ; Arcyria cinerea ( Bull. Pers. , Hemitrichia serpula ( Scop. Rost., H. calyculata ( Speg. Farr e Hemitrichia sp (Trichiaceae ; Stemonitis fusca Roth. e S. smithii Macbr. (Stemonitaceae. Exsicatas encontram-se depositadas no herbário UFP. Lycogala exiguum é assinalada pela primeira vez para Santa Catarina, Cribraria languescens para a região Sul e Cribraria vulgaris para o Brasil. O levantamento eleva para 47 o número de espécies referidas para o Estado de Santa Catarina. Fornece-se um histórico do estudo deste qrupo de organismos em Santa Catarina bem como a área de ocorrência de cada espécie no Estado e nas diferentes regiões do Brasil.A survey on Myxomycetes was made in the woods of Lagoa do Peri and Lagoa da Conceição in 1990, considering the absence of reports of this kind for the city of Florianópolis, when the following species were registered: Lycogala exiguum Morg. (Enteridiaceae; Cribraria languescem Rex, C. vulgaris Schr. (Cribrariaceae; Arcyria cinerea (Bull. Pers. Hemitrichia serpula (Scop. Rost., H. calyculata (Speg. Fair and Hemitrichia sp (Trichiaceae; Stemonitis fusca Roth, and S. smithii Macbr. (Stemonitaceae. Exicates are deposited at the herbarium UFP. Lycogala exiguum is noted for the first time in the state of Santa Catarina, Cribraria languescem in the South and Cribraria vulgaris in Brazil. The survey raises up the number of registers refered to the state of Santa Catarina to 47 species. A review of the studies on this group of organisms in Santa Catarina is given as well as the area where each species occur in this state and in different regions of Brazil.

Anti-fish bacterial pathogen effect of visible light responsive Fe3O4@TiO2 nanoparticles immobilized on glass using TiO2 sol–gel

International Nuclear Information System (INIS)

Yeh, N.; Lee, Y.C.; Chang, C.Y.; Cheng, T.C.

2013-01-01

This paper demonstrates a fish pathogen reduction procedure that uses TiO 2 sol–gel coating Fe 3 O 4 @TiO 2 powder on glass substrate. Such procedure can effectively relieve two constraints that haunt TiO 2 sterilization applications: 1) the need for UV for overcoming the wide band gap of pure TiO 2 and 2) the difficulty of its recovering from water for reuse. In the process, visible light responsive Fe 3 O 4 /TiO 2 nanoparticles are synthesized and immobilized on glass using TiO 2 sol–gel as the binder for fish bacterial pathogen disinfection test. After 3 h of visible light irradiation, the immobilized Fe 3 O 4 @TiO 2 's inhibition efficiencies for fish bacterial pathogen are, respectively, 50% for Edwardsiella tarda (BCRC 10670) and 23% for Aeromonas hydrophila (BCRC 13018)

Channel and hillslope processes revisited in the Arroyo de los Frijoles watershed near Santa Fe, New Mexico

Science.gov (United States)

Gellis, Allen C.; Emmett, William W.; Leopold, Luna Bergere

2005-01-01

Detailed documentation of geomorphic changes in the landscape of more than a few years is rarely possible. Channel cross sections, channel profiles, sediment deposition behind dams, and hillslope-erosion plots, originally benchmarked within several watersheds outside Santa Fe, New Mexico, in the 1950’s and 1960’s, for a 1966 report that documented processes and rates of arid-region sediment production and deposition, were resurveyed in the mid-1990’s. Many of the original study sites were relocated and surveyed in the mid-1990’s to determine subsequent channel and hillslope changes and to determine whether trends of channel and hillslope aggradation and degradation that were evident in the 1950’s and 1960’s have continued. In general, the net change in channel geometry has been small over the last 30–40 years. The average change in cross-sectional area of 32 resurveyed cross sections was erosion of 0.27 square meter, which equates to a 4-percent increase in cross-sectional area. The average net change in thalweg elevation for 51 resurveyed cross sections was degradation of 0.04 meter. Unpublished data (1964–68) from the scour chains showed that 371 chains had an average scour of 0.14 ± 0.14 meter and that 372 chains showed an average fill of 0.13 + 0.11 meter. Scour, found in the original study (1958–64) to be proportional to the square root of discharge, was confirmed with the addition of unpublished data (1964–68). The observed channel changes have no consistent trend, compared either to results observed in the original 1966 study or to distance from the watershed divide. The conclusion drawn in the original study was that most channels were aggrading; the resurvey showed that aggradation did not continue.An increase in housing and population in the Arroyo de los Frijoles watershed since the 1950’s has led to more roads. Channel degradation is most noticeable at road crossings. The greatest degradation of the main channel Arroyo de los

Fabrication of magnetic Fe@ZnO0.6S0.4 nanocomposite for visible-light-driven photocatalytic inactivation of Escherichia coli

Science.gov (United States)

Peng, Ziling; Wu, Dan; Wang, Wei; Tan, Fatang; Ng, Tsz Wai; Chen, Jianguo; Qiao, Xueliang; Wong, Po Keung

2017-02-01

Bacterial inactivation by magnetic photocatalysts has now received growing interests due to the easy separation for recycle and reuse of photocatalysts. In this study, magnetic Fe@ZnO0.6S0.4 photocatalyst was prepared by a facile two-step precipitation method. Multiple techniques such as X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffused reflectance spectra (UV-vis DRS) and vibrating sample magnetometer (VSM) were employed to characterize the structure, morphology and physicochemical properties of the photocatalyst. The as-obtained Fe@ZnO0.6S0.4 possessing magnetic property was easily collected from the reaction system by a magnet. Under white light-emitting-diode (LED) lamp irradiation, Fe@ZnO0.6S0.4 nanocomposite could completely inactivate 7-log of Escherichia coli K-12 within 5 h. More importantly, almost no decrease of photocatalytic efficiency in bacterial inactivation was observed even after five consecutive cycles, demonstrating Fe@ZnO0.6S0.4 exhibited good stability for reuse. The low released rate of Fe2+/Fe3+ and Zn2+ from Fe@ZnO0.6S0.4 composite further indicated the photocatalyst showed low cytotoxicity to bacterium and high stability under LED lamp irradiation. Facile preparation, high photocatalytic efficiency, good stability and reusability, and magnetic recovery property endow Fe@ZnO0.6S0.4 nanocomposite to be a promising photocatalytic material for bacterial inactivation.

LA INFORMACIÓN ETNOGRÁFICA Y ETNOLÓGICA COMO MARCO INTERPRETATIVO PARA CONTEXTOS ZOOARQUEOLÓGICOS EN LA LLANURA ALUVIAL DEL PARANÁ (SANTA FE, ARGENTINA / The ethnographic and ethnologic information as interpretative framework for zooarchaeological ...

Directory of Open Access Journals (Sweden)

Julieta Isabel Sartori

2015-12-01

Full Text Available En este trabajo se presenta información histórica proveniente de diferentes documentos escritos, los cuales fueron producidos por viajeros que estuvieron en el nuevo continente durante los S XVI y XVII. Los mismos otorgan datos acerca de la subsistencia de cazadores-recolectores-pescadores que habitaban la llanura aluvial del Paraná (centro-este de la actual provincia de Santa Fe, así como también sectores aledaños (como en el Gran Chaco y Buenos Aires, Argentina.Por otra parte también se hace referencia a investigaciones etnográficas sobre grupos de momentos históricos y actuales. En todos los casos el hincapié está puesto en aquellos grupos cuyo tipo de subsistencia podría ser comparable con la de quienes habitaron el área de interés en el pasado pre-europeo. Teniendo en cuenta los distintos tipos de registros a considerar aquí, el objetivo de este trabajo es analizar si la información que refiere a la explotación de los recursos faunísticos es útil para proporcionar marcos de referencia más amplios para las interpretaciones arqueológicas de un sector de la llanura aluvial del Paraná. AbstractIn this paper we develop historic information provide for different writings, which were produce by explorers that stay in the new continent during XVI and XVIII centuries. These documents give data about subsistence of hunter-gatherers that inhabit the Alluvial Plain of the Paraná River (east-center of Santa Fe and adjacent sectors (i.e. Gran Chaco y Buenos Aires, Argentina.In addition, we also make references about the ethnographical researches for current and historical groups. In all cases we emphasis those which subsistence could be comparable with the hunter-gatherers that lived in the area under studied. Considering the different types of works that we refer, we aim to analyze if the information about the exploitation of fauna resources is useful to provide a frame of reference to archaeological interpretations in the

Preparation of MIL-53(Fe)-Reduced Graphene Oxide Nanocomposites by a Simple Self-Assembly Strategy for Increasing Interfacial Contact: Efficient Visible-Light Photocatalysts.

Science.gov (United States)

Liang, Ruowen; Shen, Lijuan; Jing, Fenfen; Qin, Na; Wu, Ling

2015-05-13

In this work, MIL-53(Fe)-reduced graphene oxide (M53-RGO) nanocomposites have been successfully fabricated by a facile and efficient electrostatic self-assembly strategy for improving the interfacial contact between RGO and the MIL-53(Fe). Compared with D-M53-RGO (direct synthesis of MIL-53(Fe)-reduced graphene oxide nanocomposites via one-pot solvothermal approach), M53-RGO nanocomposites exhibit improved photocatalytic activity compared with the D-M53-RGO under identical experimental conditions. After 80 min of visible light illumination (λ ≥ 420 nm), the reduction ratio of Cr(VI) is rapidly increased to 100%, which is also higher than that of reference sample (N-doped TiO2). More significantly, the M53-RGO nanocomposites are proven to perform as bifunctional photocatalysts with considerable activity in the mixed systems (Cr(VI)/dyes) under visible light, which made it a potential candidate for industrial wastewater treatment. Combining with photoelectrochemical analyses, it could be revealed that the introduction of RGO would minimize the recombination of photogenerated electron-hole pairs. Additionally, the effective interfacial contact between MIL-53(Fe) and RGO surface would further accelerate the transfer of photogenerated electrons, leading to the enhancement of photocatalytic activity of M53-RGO toward photocatalytic reactions. Finally, a possible photocatalytic reaction mechanism is also investigated in detail.

Magnetic and luminescent properties of Fe/Fe{sub 3}O{sub 4}-Y{sub 2}O{sub 3}:Eu nanocomposites

Energy Technology Data Exchange (ETDEWEB)

Wang Qin [College of Chemistry, Jilin University, Changchun 130012 (China); College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot (China); Yang Xuwei; Yu Lianxiang [College of Chemistry, Jilin University, Changchun 130012 (China); Yang Hua, E-mail: huayang86@sina.com [College of Chemistry, Jilin University, Changchun 130012 (China)

2011-09-15

Highlights: > We synthesize multifunctional Fe/Fe{sub 3}O{sub 4}-Y{sub 2}O{sub 3}:Eu nanocomposites. > The luminescent and magnetic properties of the nanocomposites are researched. > The nanocomposites showed both ferrimagnetic behavior and unique europium fluorescence properties with high emission intensity. > The spectra changes induced by the UV light irradiation and the magnetic field have been systematically studied and compared in detail. > And the hysteresis curve changes induced by the UV light irradiation have been discussed. - Abstract: Multifunctional nanocomposites with Fe/Fe{sub 3}O{sub 4} nanoparticles as the core and europium-doped yttrium oxide (Y{sub 2}O{sub 3}:Eu) as the shell (Fe/Fe{sub 3}O{sub 4}-Y{sub 2}O{sub 3}:Eu) have been obtained successfully employing a solvothermal method. The nanocomposites showed both ferrimagnetic behavior and unique europium fluorescence properties with high emission intensity. The spectra changes induced by the UV light irradiation and the magnetic field have been systematically studied and compared in detail. The relationship between fluorescence and magnetic properties of the multifunctional nanocomposites has been investigated in our manuscript. These multifunctional nanocomposites could be used in a number of biomedical applications, such as drug targeting, cell separation and bioimaging.

Light, Alpha, and Fe-peak Element Abundances in the Galactic Bulge

Science.gov (United States)

Johnson, Christian I.; Rich, R. Michael; Kobayashi, Chiaki; Kunder, Andrea; Koch, Andreas

2014-10-01

We present radial velocities and chemical abundances of O, Na, Mg, Al, Si, Ca, Cr, Fe, Co, Ni, and Cu for a sample of 156 red giant branch stars in two Galactic bulge fields centered near (l, b) = (+5.25,-3.02) and (0,-12). The (+5.25,-3.02) field also includes observations of the bulge globular cluster NGC 6553. The results are based on high-resolution (R ~ 20,000), high signal-to-noise ration (S/N >~ 70) FLAMES-GIRAFFE spectra obtained through the European Southern Observatory archive. However, we only selected a subset of the original observations that included spectra with both high S/N and that did not show strong TiO absorption bands. This work extends previous analyses of this data set beyond Fe and the α-elements Mg, Si, Ca, and Ti. While we find reasonable agreement with past work, the data presented here indicate that the bulge may exhibit a different chemical composition than the local thick disk, especially at [Fe/H] >~ -0.5. In particular, the bulge [α/Fe] ratios may remain enhanced to a slightly higher [Fe/H] than the thick disk, and the Fe-peak elements Co, Ni, and Cu appear enhanced compared to the disk. There is also some evidence that the [Na/Fe] (but not [Al/Fe]) trends between the bulge and local disk may be different at low and high metallicity. We also find that the velocity dispersion decreases as a function of increasing [Fe/H] for both fields, and do not detect any significant cold, high-velocity populations. A comparison with chemical enrichment models indicates that a significant fraction of hypernovae may be required to explain the bulge abundance trends, and that initial mass functions that are steep, top-heavy (and do not include strong outflow), or truncated to avoid including contributions from stars >40 M ⊙ are ruled out, in particular because of disagreement with the Fe-peak abundance data. For most elements, the NGC 6553 stars exhibit abundance trends nearly identical to comparable metallicity bulge field stars. However, the

Light, alpha, and Fe-peak element abundances in the galactic bulge

International Nuclear Information System (INIS)

Johnson, Christian I.; Rich, R. Michael; Kobayashi, Chiaki; Kunder, Andrea; Koch, Andreas

2014-01-01

We present radial velocities and chemical abundances of O, Na, Mg, Al, Si, Ca, Cr, Fe, Co, Ni, and Cu for a sample of 156 red giant branch stars in two Galactic bulge fields centered near (l, b) = (+5.25,–3.02) and (0,–12). The (+5.25,–3.02) field also includes observations of the bulge globular cluster NGC 6553. The results are based on high-resolution (R ∼ 20,000), high signal-to-noise ration (S/N ≳ 70) FLAMES-GIRAFFE spectra obtained through the European Southern Observatory archive. However, we only selected a subset of the original observations that included spectra with both high S/N and that did not show strong TiO absorption bands. This work extends previous analyses of this data set beyond Fe and the α-elements Mg, Si, Ca, and Ti. While we find reasonable agreement with past work, the data presented here indicate that the bulge may exhibit a different chemical composition than the local thick disk, especially at [Fe/H] ≳ –0.5. In particular, the bulge [α/Fe] ratios may remain enhanced to a slightly higher [Fe/H] than the thick disk, and the Fe-peak elements Co, Ni, and Cu appear enhanced compared to the disk. There is also some evidence that the [Na/Fe] (but not [Al/Fe]) trends between the bulge and local disk may be different at low and high metallicity. We also find that the velocity dispersion decreases as a function of increasing [Fe/H] for both fields, and do not detect any significant cold, high-velocity populations. A comparison with chemical enrichment models indicates that a significant fraction of hypernovae may be required to explain the bulge abundance trends, and that initial mass functions that are steep, top-heavy (and do not include strong outflow), or truncated to avoid including contributions from stars >40 M ☉ are ruled out, in particular because of disagreement with the Fe-peak abundance data. For most elements, the NGC 6553 stars exhibit abundance trends nearly identical to comparable metallicity bulge field stars

Light, alpha, and Fe-peak element abundances in the galactic bulge

Energy Technology Data Exchange (ETDEWEB)

Johnson, Christian I. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS-15, Cambridge, MA 02138 (United States); Rich, R. Michael [Department of Physics and Astronomy, UCLA, 430 Portola Plaza, Box 951547, Los Angeles, CA 90095-1547 (United States); Kobayashi, Chiaki [Centre for Astrophysics Research, University of Hertfordshire, Hatfield AL10 9AB (United Kingdom); Kunder, Andrea [Leibniz-Institute für Astrophysik Potsdam (AIP), Ander Sternwarte 16, D-14482, Potsdam (Germany); Koch, Andreas, E-mail: cjohnson@cfa.harvard.edu, E-mail: rmr@astro.ucla.edu, E-mail: c.kobayashi@herts.ac.uk, E-mail: akunder@aip.de, E-mail: akoch@lsw.uni-heidelberg.de [Zentrum für Astronomie der Universität Heidelberg, Landessternwarte, Königstuhl 12, Heidelberg (Germany)

2014-10-01

We present radial velocities and chemical abundances of O, Na, Mg, Al, Si, Ca, Cr, Fe, Co, Ni, and Cu for a sample of 156 red giant branch stars in two Galactic bulge fields centered near (l, b) = (+5.25,–3.02) and (0,–12). The (+5.25,–3.02) field also includes observations of the bulge globular cluster NGC 6553. The results are based on high-resolution (R ∼ 20,000), high signal-to-noise ration (S/N ≳ 70) FLAMES-GIRAFFE spectra obtained through the European Southern Observatory archive. However, we only selected a subset of the original observations that included spectra with both high S/N and that did not show strong TiO absorption bands. This work extends previous analyses of this data set beyond Fe and the α-elements Mg, Si, Ca, and Ti. While we find reasonable agreement with past work, the data presented here indicate that the bulge may exhibit a different chemical composition than the local thick disk, especially at [Fe/H] ≳ –0.5. In particular, the bulge [α/Fe] ratios may remain enhanced to a slightly higher [Fe/H] than the thick disk, and the Fe-peak elements Co, Ni, and Cu appear enhanced compared to the disk. There is also some evidence that the [Na/Fe] (but not [Al/Fe]) trends between the bulge and local disk may be different at low and high metallicity. We also find that the velocity dispersion decreases as a function of increasing [Fe/H] for both fields, and do not detect any significant cold, high-velocity populations. A comparison with chemical enrichment models indicates that a significant fraction of hypernovae may be required to explain the bulge abundance trends, and that initial mass functions that are steep, top-heavy (and do not include strong outflow), or truncated to avoid including contributions from stars >40 M {sub ☉} are ruled out, in particular because of disagreement with the Fe-peak abundance data. For most elements, the NGC 6553 stars exhibit abundance trends nearly identical to comparable metallicity bulge field

Chemical decontamination of Santa Maria de Garona NPP recirculation loops

Energy Technology Data Exchange (ETDEWEB)

Coello, R. [Santa Maria de Garona NPP - NUCLENOR, S.A. (Spain)

2002-07-01

Santa Maria de Garona is a boiling water reactor (BWR-3) with a Primary Containment type Mark 1. Its electrical power is 466 Mw and began its commercial operation in 1971. The plant currently operates in 24 month cycles. The reactor water recirculation system (RWRS) is composed of two independent loops. Each of them has a one stage vertical centrifugal recirculation pump, with a nominal flow of 2020 l/s, and ten jet pumps. It is worthy of mention that in 1986 it was started to inject hydrogen into the feedwater (concentration = 0,3 mg/l) in order to implement the chemical condition known as hydrogen water chemistry (HWC) in the primary circuit. The objective was to create an electrochemical potential below -230 mV in the RWRS which is assumed to be low enough to mitigate the intergranular stress corrosion cracking phenomena (IGSCC) in the sensitized austenitic stainless steels. Later, in 1994, the hydrogen concentration in the feedwater was increased to 0,9 mg/l in order to obtain the protection's ECP in the bottom of the reactor vessel. This feedwater hydrogen concentration has been maintained since then. The nature of the oxides that are formed in the RWRS is strongly affected by the electrochemical conditions (ECP) which have been maintained in this system. It is frequent to find oxides like Fe{sub 2}O{sub 3} (hematite), Fe{sub 3}O{sub 4} (magnetite), NiFe{sub 2}O{sub 4} (trevorite), Cr{sub 2} FeO{sub 4} (chromite), Fe{sub 3-x-y} Cr{sub x} Ni{sub y} O{sub 4} (spinels), etc. However, it is normal to find a combination of all of them in various proportions, depending on the ECP established. Radioactive isotopes of the transition metals ({sup 60}Co, {sup 54}Mn, {sup 51}Cr, {sup 59}Fe, etc.) also participate in these oxides and contribute greatly to increase the dose rate in the circuit. The chemical decontamination processes are designed for the effective dissolution of the metallic oxides present and therefore the type of process to be applied will depend

Visible light photocatalytic activities of ZnFe_2O_4/ZnO nanoparticles for the degradation of organic pollutants

International Nuclear Information System (INIS)

Rameshbabu, R.; Kumar, Niraj; Karthigeyan, A.; Neppolian, B.

2016-01-01

ZnFe_2O_4/ZnO nanoparticles have been synthesized by co-precipitation method using polyvinyl alcohol (PVA) as surfactant. The phase formation of synthesized products was systematically investigated from powder X-ray diffraction. Cubic ZnFe_2O_4 and hexagonal ZnO were identified in accordance with different molar concentrations of Fe"3"+ ions. The morphology and functionality were analyzed using field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectroscopy. The optical properties and change in the band gap from UV to visible region upon increasing molar concentration of Fe"3"+ ions were analyzed from diffuse reflectance spectra (DRS). Superparamagnetic property was observed for synthesized ZnFe_2O_4/ZnO nanoparticles using vibrating sample magnetometer (VSM). The methylene blue and methyl orange were taken as model dyes to illustrate the photocatalytic activity of synthesized products under visible light irradiation. Maximum degradation of 99% for methyl orange (MO) was achieved by the use of 13 nm sized ZnFe_2O_4/ZnO nanoparticles as catalyst and a minutely less activity was observed for the methylene blue (MB) degradation (98%), when the photocatalytic processes were carried out for 5 h and 6 h, respectively. - Highlights: • Co-precipitation method is proposed to synthesize magnetic nanoparticles. • Modifications in the molar concentration lead to the shift in absorption edge. • Superparamagnetic property is demonstrated for the nanoparticles. • Two dye pollutants are utilized to demonstrate the photocatalytic activity.

33 CFR 334.730 - Waters of Santa Rosa Sound and Gulf of Mexico adjacent to Santa Rosa Island, Air Force Proving...

Science.gov (United States)

2010-07-01

... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false Waters of Santa Rosa Sound and..., Fla. 334.730 Section 334.730 Navigation and Navigable Waters CORPS OF ENGINEERS, DEPARTMENT OF THE ARMY, DEPARTMENT OF DEFENSE DANGER ZONE AND RESTRICTED AREA REGULATIONS § 334.730 Waters of Santa Rosa...

Synthesis of visible light active Gd3+-substituted ZnFe2O4 nanoparticles for photocatalytic and antibacterial activities

Science.gov (United States)

Patil, S. B.; Bhojya Naik, H. S.; Nagaraju, G.; Viswanath, R.; Rashmi, S. K.

2017-08-01

In the present analysis, we study the assembly of a low-cost and visible light active ZnFe2-xGdxO4 ( x = 0 , 0.3, 0.5 and 0.7) nanoparticles (NPs) photocatalyst. The synthesized samples were characterized by several physicochemical techniques, such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), UV-Visible absorption spectroscopy (UV-Vis), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). The phase transition from cubic to orthorhombic was confirmed by XRD patterns. The increase in the concentration of Gd3+ substitution in ZnFe2O4 NPs enhances the redshift of absorption in the visible region of UV-Vis absorption spectra and reduces the band gap. In the photo-Fenton-type reaction, the gadolinium-substituted zinc ferrite (ZGF) NPs exhibit a significant catalytic activity for the degradation of methylene blue (99% in 90 minutes) under visible light (500W xenon lamp) with respect to bare samples (95% in 240 minutes) and they also show an excellent reusability nature. These materials were also screened for antibacterial activity against Gram-negative bacteria strains ( Pseudomonas aeruginosa and Escherichia coli).

Use of Fe(III) oxalate for oxidativewastewater treatment; Einsatz von Fe(III)-Oxalat zur chemisch-oxidativen Abwasserbehandlung

Energy Technology Data Exchange (ETDEWEB)

Kim, S.M.; Vogelpohl, A. [Clausthal Univ., Clausthal-Zellerfeld (Germany). Inst. fuer Thermische Verfahrenstechnik

1998-08-01

Iron(III)-oxalate was used as an iron catalyst for the Photo Fenton reaction. Iron(III) oxalations ([Fe(C{sub 2}O{sub 4}){sub 3}]{sup 3-}) are reduced to Fe(II) by irradiation using near UV-light ({lambda} = 300 - 400 nm) or visible light ({lambda} > 400 nm). At the same time, CO{sub 2}{sup -} or C{sub 2}O{sub 4}{sup -}-radicals originate, which cause the secondary reduction of Fe(III) to Fe(II). By means of the photolytically regenerated Fe(II) ions, hydroxyl radicals are increasingly formed, so that the degradation of organic substances is accelerated. The work aimed to assess the catalytic effect of Fe(III) oxalate for photochemical oxidation processes and to establish the parameters influencing further treatment of leachate from a municipal waste sanitary landfill by means of technical-scale experiments. (orig.) [Deutsch] In der vorliegenden Arbeit wurde Eisen(III)-Oxalat als Eisenkatalysator fuer die Photo-Fenton-Reaktion eingesetzt. Eisen(III)-Oxalationen ([Fe(C{sub 2}O{sub 4}){sub 3}]{sup 3-}) werden durch Strahlung mit nahem UV-Licht ({lambda}=300 bis 400 nm) oder mit sichtbarem Licht ({lambda}>400 nm) zu Fe(II) reduziert. Gleichzeitig entstehen CO{sub 2}{sup .-} oder C{sub 2}O{sub 4}{sup .-}-Radikale, die eine sekundaere Reduktion von Fe(III) zu Fe(II) bewirken. Mit Hilfe der photolytiisch regenerierten Fe(II)-Ionen werden vermehrt Hydroxylradikale gebildet und damit die Abbaugeschwindigkeit der organischen Substanzen beschleunigt. Ziel der hier vorgestellten Arbeit war es, die katalytische Wirkung von Fe(III)-Oxalat fuer photochemische Oxidationsverfahren abzuschaetzen und die Einflussparameter zur weitergehenden Behandlung eines Deponiesickerwassers aus Hausmuelldeponie anhand von Technikumsversuchen zu ermitteln. (orig.)

Epitaxial Bi2 FeCrO6 Multiferroic Thin Film as a New Visible Light Absorbing Photocathode Material.

Science.gov (United States)

Li, Shun; AlOtaibi, Bandar; Huang, Wei; Mi, Zetian; Serpone, Nick; Nechache, Riad; Rosei, Federico

2015-08-26

Ferroelectric materials have been studied increasingly for solar energy conversion technologies due to the efficient charge separation driven by the polarization induced internal electric field. However, their insufficient conversion efficiency is still a major challenge. Here, a photocathode material of epitaxial double perovskite Bi(2) FeCrO(6) multiferroic thin film is reported with a suitable conduction band position and small bandgap (1.9-2.1 eV), for visible-light-driven reduction of water to hydrogen. Photoelectrochemical measurements show that the highest photocurrent density up to -1.02 mA cm(-2) at a potential of -0.97 V versus reversible hydrogen electrode is obtained in p-type Bi(2) FeCrO(6) thin film photocathode grown on SrTiO(3) substrate under AM 1.5G simulated sunlight. In addition, a twofold enhancement of photocurrent density is obtained after negatively poling the Bi(2) FeCrO(6) thin film, as a result of modulation of the band structure by suitable control of the internal electric field gradient originating from the ferroelectric polarization in the Bi(2) FeCrO(6) films. The findings validate the use of multiferroic Bi(2) FeCrO(6) thin films as photocathode materials, and also prove that the manipulation of internal fields through polarization in ferroelectric materials is a promising strategy for the design of improved photoelectrodes and smart devices for solar energy conversion. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Thermodynamic Modelling of Fe-Cr-Ni-Spinel Formation at the Light-Water Reactor Conditions

International Nuclear Information System (INIS)

Kurepin, V. A.; Kulik, D. A.; Hitpold, A.; Nicolet, M.

2002-03-01

In the light water reactors (LWR), the neutron activation and transport of corrosion products is of concern in the context of minimizing the radiation doses received by the personnel during maintenance works. A practically useful model for transport and deposition of the stainless steel corrosion products in LWR can only be based on an improved understanding of chemical processes, in particular, on the attainment of equilibrium in this hydrothermal system, which can be described by means of a thermodynamic solid-solution -aqueous-solution (SSAS) model. In this contribution, a new thermodynamic model for a Fe-Cr-Ni multi-component spinel solid solutions was developed that considers thermodynamic consequences of cation interactions in both spinel sub-Iattices. The obtained standard thermodynamic properties of two ferrite and two chromite end-members and their mixing parameters at 90 bar pressure and 290 *c temperature predict a large miscibility gap between (Fe,Ni) chromite and (Fe,Ni) ferrite phases. Together with the SUPCRT92-98 thermo- dynamic database for aqueous species, the 'spinel' thermodynamic dataset was applied to modeling oxidation of austenitic stainless steel in hydrothermal water at 290*C and 90 bar using the Gibbs energy minimization (GEM) algorithm, implemented in the GEMS-PSI code. Firstly, the equilibrium compositions of steel oxidation products were modelIed as function of oxygen fugacity .fO 2 by incremental additions of O 2 in H 2 O-free system Cr-Fe- Ni-O. Secondly, oxidation of corrosion products in the Fe-Cr-Ni-O-H aquatic system was modelIed at different initial solid/water ratios. It is demonstrated that in the transition region from hydrogen regime to oxygen regime, the most significant changes in composition of two spinel-oxide phases (chromite and ferrite) and hematite must take place. Under more reduced conditions, the Fe-rich ferrite (magnetite) and Ni-poor chromite phases co-exist at equilibrium with a metal Ni phase, maintaining

Thermodynamic Modelling of Fe-Cr-Ni-Spinel Formation at the Light-Water Reactor Conditions

Energy Technology Data Exchange (ETDEWEB)

Kurepin, V.A.; Kulik, D.A.; Hitpold, A.; Nicolet, M

2002-03-01

In the light water reactors (LWR), the neutron activation and transport of corrosion products is of concern in the context of minimizing the radiation doses received by the personnel during maintenance works. A practically useful model for transport and deposition of the stainless steel corrosion products in LWR can only be based on an improved understanding of chemical processes, in particular, on the attainment of equilibrium in this hydrothermal system, which can be described by means of a thermodynamic solid-solution -aqueous-solution (SSAS) model. In this contribution, a new thermodynamic model for a Fe-Cr-Ni multi-component spinel solid solutions was developed that considers thermodynamic consequences of cation interactions in both spinel sub-Iattices. The obtained standard thermodynamic properties of two ferrite and two chromite end-members and their mixing parameters at 90 bar pressure and 290 *c temperature predict a large miscibility gap between (Fe,Ni) chromite and (Fe,Ni) ferrite phases. Together with the SUPCRT92-98 thermo- dynamic database for aqueous species, the 'spinel' thermodynamic dataset was applied to modeling oxidation of austenitic stainless steel in hydrothermal water at 290*C and 90 bar using the Gibbs energy minimization (GEM) algorithm, implemented in the GEMS-PSI code. Firstly, the equilibrium compositions of steel oxidation products were modelIed as function of oxygen fugacity .fO{sub 2} by incremental additions of O{sub 2} in H{sub 2}O-free system Cr-Fe- Ni-O. Secondly, oxidation of corrosion products in the Fe-Cr-Ni-O-H aquatic system was modelIed at different initial solid/water ratios. It is demonstrated that in the transition region from hydrogen regime to oxygen regime, the most significant changes in composition of two spinel-oxide phases (chromite and ferrite) and hematite must take place. Under more reduced conditions, the Fe-rich ferrite (magnetite) and Ni-poor chromite phases co-exist at equilibrium with a metal Ni

Proceedings of the neutrons in biology conference, Santa Fe, NM, October 1994

International Nuclear Information System (INIS)

Schoenborn, B.P.

1994-01-01

This volume provides the proceedings for the Neutrons in Biology Conference held in Sante Fe, New Mexico October 1994. The volume is composed of full papers authored by the presenters at the conference. The sessions by which the presentations were organized are entitled Neutron Anatomy, Neutron Sources, Neutron Instrumentation, Small Angle Scattering, Membrane Structures and Dynamics, Protein Structures, Fiber Diffraction, and New Analysis and Experimental Techniques. Each paper has been separately indexed and abstracted for the database

Proceedings of the neutrons in biology conference, Santa Fe, NM, October 1994

Energy Technology Data Exchange (ETDEWEB)

Schoenborn, B.P.

1994-12-31

This volume provides the proceedings for the Neutrons in Biology Conference held in Sante Fe, New Mexico October 1994. The volume is composed of full papers authored by the presenters at the conference. The sessions by which the presentations were organized are entitled Neutron Anatomy, Neutron Sources, Neutron Instrumentation, Small Angle Scattering, Membrane Structures and Dynamics, Protein Structures, Fiber Diffraction, and New Analysis and Experimental Techniques. Each paper has been separately indexed and abstracted for the database.

Fabrication of magnetic Fe@ZnO_0_._6S_0_._4 nanocomposite for visible-light-driven photocatalytic inactivation of Escherichia coli

International Nuclear Information System (INIS)

Peng, Ziling; Wu, Dan; Wang, Wei; Tan, Fatang; Ng, Tsz Wai; Chen, Jianguo; Qiao, Xueliang; Wong, Po Keung

2017-01-01

Highlights: • Fe@ZnO_0_._6S_0_._4 was prepared by a facile two-step precipitation method. • Fe@ZnO_0_._6S_0_._4 exhibited high photocatalytic activity under LED lamp irradiation. • Fe@ZnO_0_._6S_0_._4 possessed good stability and reusability for bacterial inactivation. • Fe@ZnO_0_._6S_0_._4 could be easily collected from the reaction solution by a magnet. • The release rate of metal ions from nanocomposite was kept at a very low level. - Abstract: Bacterial inactivation by magnetic photocatalysts has now received growing interests due to the easy separation for recycle and reuse of photocatalysts. In this study, magnetic Fe@ZnO_0_._6S_0_._4 photocatalyst was prepared by a facile two-step precipitation method. Multiple techniques such as X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), UV–vis diffused reflectance spectra (UV-vis DRS) and vibrating sample magnetometer (VSM) were employed to characterize the structure, morphology and physicochemical properties of the photocatalyst. The as-obtained Fe@ZnO_0_._6S_0_._4 possessing magnetic property was easily collected from the reaction system by a magnet. Under white light-emitting-diode (LED) lamp irradiation, Fe@ZnO_0_._6S_0_._4 nanocomposite could completely inactivate 7-log of Escherichia coli K-12 within 5 h. More importantly, almost no decrease of photocatalytic efficiency in bacterial inactivation was observed even after five consecutive cycles, demonstrating Fe@ZnO_0_._6S_0_._4 exhibited good stability for reuse. The low released rate of Fe"2"+/Fe"3"+ and Zn"2"+ from Fe@ZnO_0_._6S_0_._4 composite further indicated the photocatalyst showed low cytotoxicity to bacterium and high stability under LED lamp irradiation. Facile preparation, high photocatalytic efficiency, good stability and reusability, and magnetic recovery property endow Fe@ZnO_0_._6S_0_._4 nanocomposite to be a promising photocatalytic material

Light Emission from the Fe2+-EGTA-H2O2 System: Possible Application for the Determination of Antioxidant Activity of Plant Phenolics

Directory of Open Access Journals (Sweden)

Michal Nowak

2018-04-01

Full Text Available Oxidative reactions can result in the formation of electronically excited species that undergo radiative decay depending on electronic transition from the excited state to the ground state with subsequent ultra-weak photon emission (UPE. We investigated the UPE from the Fe2+-EGTA (ethylene glycol-bis(β-aminoethyl ether-N,N,N′,N′-tetraacetic acid–H2O2 system with a multitube luminometer (Peltier-cooled photon counter, spectral range 380 to 630 nm. The UPE of 92.6 µmol/L Fe2+—185.2 µmol/L EGTA—2.6 mmol/L H2O2 reached 4319 ± 755 relative light units during 2 min measurement and was about seven times higher (p < 0.001 than the UPE of incomplete systems (Fe2+-H2O2, EGTA-H2O2 and medium alone. Substitution of Fe2+ with Cr2+, Co2+, Mn2+ or Cu2+ as well as of EGTA with EDTA (ethylenediaminetetraacetic acid or citrate completely abolished UPE. Experiments with ROS scavengers revealed the dependence of UPE on hydroxyl radicals suggesting occurrence of oxidative attack and cleavage of the ether bond in EGTA backbone structure and formation of triplet excited carbonyl groups with subsequent light emission. Plant phenolics (ferulic, chlorogenic and caffec acids at concentration 87 µmol/L and ascorbate at 0.46 mmol/L inhibited UPE by 90 ± 4%, 90 ± 5%, 97 ± 2% and 92 ± 1%, respectively. Quenching of UPE from Fe2+-EGTA-H2O2 system can be used for evaluation of antioxidant activity of phytochemicals.

Electronic structure of light impurities in α-Fe and V

International Nuclear Information System (INIS)

Gong Xingao; Zeng Zhi; Zheng Wingqi

1987-07-01

The electronic structure of α-Fe and V with hydrogen and carbon as impurities is calculated using the embedded cluster models in the framework of self-consistent local density theory. The results obtained reveal that the charge transfer between the H atom and the host atom is small, but the magnetic moments of neighbouring Fe atoms are reduced. The total energy implies that hydrogen in α-Fe is more easily found to occupy the octahedral interstitial site. On the other hand, there is a charge transfer between the C atom and the host atoms. The distance between the carbon and the nearest neighbour iron atoms is 23% elongated. The interaction between the hydrogen and the carbon impurities was studied using a set of clusters of Fe 10 CH in which the atoms were located in five kinds of configuration. The energy of clusters with hydrogen on octahedral interstitial site is lower than that on the tetrahedral interstitial site. (author). 10 refs, 6 figs, 2 tabs

Santa Elena. Ready to reshape its transport energy matrix

Energy Technology Data Exchange (ETDEWEB)

Moreano, Hernan [Universidad Estatal Peninsula de Santa Elena (Ecuador). Inst. de Investigacion Cientifica y Desarrollo Tecnologico (INCYT)

2012-07-01

The renewable energy issue opens the door to an ambient of opportunities. Santa Elena, one of the coastal provinces of Ecuador has the chance to go from a fossil fuel energy culture to a new energy scheme based on the use of environmental friendly fuels like natural gas and other renewable energy carriers like hydrogen. The marginal production of oil and natural gas from the Gustavo Galindo Velasco field and the updated gas reserves from the Gulf of Guayaquil make it possible. Infrastructure for natural gas production and distribution for vehicles is almost ready and any of the three refineries can generate hydrogen from natural gas. This provides the opportunity to reshape the Santa Elena transport energy matrix, where vehicles can burn natural gas and inter country buses can work with hydrogen. Traditional Fishing boats can be fitted with hydrogen storage and fuel systems later on. Santa Elena should face this challenge through a joint effort of public and private parties. Santa Elena State University and its partners as a focus point to create: The Campus of Energy Knowledge, where research, science and technology will serve companies that work in the energy business with a strong synergy, which will create jobs for the Santa Elena people. (orig.)

An Empirical Fitting Method for Type Ia Supernova Light Curves: A Case Study of SN 2011fe

Energy Technology Data Exchange (ETDEWEB)

Zheng, WeiKang; Filippenko, Alexei V., E-mail: zwk@astro.berkeley.edu [Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States)

2017-03-20

We present a new empirical fitting method for the optical light curves of Type Ia supernovae (SNe Ia). We find that a variant broken-power-law function provides a good fit, with the simple assumption that the optical emission is approximately the blackbody emission of the expanding fireball. This function is mathematically analytic and is derived directly from the photospheric velocity evolution. When deriving the function, we assume that both the blackbody temperature and photospheric velocity are constant, but the final function is able to accommodate these changes during the fitting procedure. Applying it to the case study of SN 2011fe gives a surprisingly good fit that can describe the light curves from the first-light time to a few weeks after peak brightness, as well as over a large range of fluxes (∼5 mag, and even ∼7 mag in the g band). Since SNe Ia share similar light-curve shapes, this fitting method has the potential to fit most other SNe Ia and characterize their properties in large statistical samples such as those already gathered and in the near future as new facilities become available.

Santa soja: narrativa documental em fotolivro

OpenAIRE

Seidl, Eduardo

2016-01-01

A partir do fotolivro Santa Soja como objeto e do resgate histórico das práticas jornalísticas de reportagem e de edição por meio de entrevistas com os cinco autores, esta pesquisa busca identificar o fotolivro como formato potencializador do fotodocumentarismo. Para tanto, foi proposta uma localização conceitual sobre o fotolivro, a linguagem e a narrativa fotográfica e sobre a vocação historiográfica e testemunhal da fotografia, a fim de contextualizar uma análise do fotolivro Santa Soja qu...

Facile Synthesis of Magnetic Photocatalyst Ag/BiVO4/Mn1−xZnxFe2O4 and Its Highly Visible-Light-Driven Photocatalytic Activity

Directory of Open Access Journals (Sweden)

Taiping Xie

2018-05-01

Full Text Available Ag/BiVO4/Mn1−xZnxFe2O4 was synthesized with a dip-calcination in situ synthesis method. This work was hoped to provide a simple method to synthesis three-phase composite. The phase structure, optical properties and magnetic feature were confirmed by X-ray diffraction (XRD, Fourier transform infrared spectroscopy (FTIR, X-ray photoelectron spectrometer (XPS, transmission electron microscopy (TEM, ultraviolet-visible diffuse reflectance spectrophotometer (UV-vis DRS, and vibrating sample magnetometer (VSM. The photocatalytic activity was investigated by Rhodamine B (RhB photo-degradation under visible light irradiation. The photo-degradation rate of RhB was 94.0~96.0% after only 60 min photocatalytic reaction under visible light irradiation, revealing that it had an excellent visible-light-induced photocatalytic activity. In the fifth recycle, the degradation rate of Ag/BiVO4/Mn1−xZnxFe2O4 still reached to 94.0%. Free radical tunnel experiments confirmed the dominant role of •O2− in the photocatalytic process for Ag/BiVO4/Mn1−xZnxFe2O4. Most importantly, the mechanism that multifunction Ag could enhance photocatalytic activity was explained in detail.

Facile fabrication of mesoporous Fe-Ti-SBA15 silica with enhanced visible-light-driven simultaneous photocatalytic degradation and reduction reactions

Science.gov (United States)

Chang, Fei; Jiao, Mingzhi; Xu, Quan; Deng, Baoqing; Hu, Xuefeng

2018-03-01

A series of mesoporous iron-titanium-containing silica Fe-TiO2-SBA15 (FTS) were constructed via a facile one-pot hydrothermal route and subsequently characterized by X-ray diffraction patterns, UV-vis diffuse reflection spectroscopy, transmission electron microscopy, scanning electron microscopy, nitrogen adsorption-desorption, X-ray photoelectron spectroscopy, and X-ray energy dispersion spectroscopy. By analyses, these samples possessed ordered two-dimensional hexagonal mesoporous structures, mainly involving mixed dual-phases of anatase and rutile TiO2, like commercial titania P25. The UV-vis diffuse reflection spectra demonstrated the presence of Fe species that was further confirmed by the X-ray photoelectron spectra and X-ray energy dispersion spectrum. The existence of Fe species in form of Fe3+ cations played an important role on the phase composition and electronic structure of these samples. With structural and morphological merits, these samples exhibited relatively high photocatalytic efficiency toward the degradation of dye methylene blue (MB) and reduction of Cr(VI) under visible-light irradiation, comparing with P25. In addition, among all candidates, the sample with a Fe/Si molar ratio of 0.03 showed the highest catalytic performance under optimal conditions, especially in the coexistence of both MB and Cr(VI), revealing an obviously synergistic effect when the consumption of both contaminants occurred. Finally, a primary catalytic mechanism was speculated on basis of active species capture experiments.

Effect of low-molecular-weight organic acids on photo-degradation of phenanthrene catalyzed by Fe(III)-smectite under visible light.

Science.gov (United States)

Jia, Hanzhong; Chen, Hongxia; Nulaji, Gulimire; Li, Xiyou; Wang, Chuanyi

2015-11-01

The photolysis of polycyclic aromatic hydrocarbons (PAHs) is potentially an important process for its transformation and fate on contaminated soil surfaces. In this study, phenanthrene is employed as a model to explore PAH photodegradation with the assistance of Fe(III)-smectite under visible-light while focusing on roles played by five low-molecular-weight organic acids (LMWOAs), i.e., malic acid, oxalic acid, citric acid, ethylenediaminetetraacetic acid (EDTA), and nitrilotriacetic acid. Our results show that oxalic acid is most effective in promoting the photodegradation of phenanthrene, while only a slight increase in the rate of phenanthrene photodegradation is observed in the presence of malic acid. Electron paramagnetic resonance experiments confirm the formation of CO2(-) radicals in the presence of malic and oxalic acid, which provides strong evidence for generating OH and subsequent photoreaction pathways. The presence of EDTA or nitrilotriacetic acid significantly inhibits both Fe(II) formation and phenanthrene photodegradation because these organic anions tend to chelate with Fe(III), leading to decreases in the electron-accepting potential of Fe(III)-smectite and a weakened interaction between phenanthrene and Fe(III)-smectite. These observations provide valuable insights into the transformation and fate of PAHs in the natural soil environment and demonstrate the potential for using some LMWOAs as additives for the remediation of contaminated soil. Copyright © 2015 Elsevier Ltd. All rights reserved.

"Santa Maria" forever : Eesti ja Portugali kirjandussuhetest / Toomas Haug

Index Scriptorium Estoniae

Haug, Toomas, 1956-

2012-01-01

Jaanuaris 1961 Portugali diktaatorlikule režiimile protestiks kaaperdatud laevast "Santa Maria", mis sai omamoodi vabaduse ja vastuhaku sümboliks ka okupeeritud Eestis. Artiklis käsitletakse sellest sündmusest mõjutatud teoseid, täpsemalt Aleksander Suumanni maali "Santa Maria" ja Paul-Eerik Rummo samanimelist luuletust

"Santa Maria" forever : Eesti ja Portugali kirjandussuhetest / Toomas Haug

Index Scriptorium Estoniae

Haug, Toomas, 1956-

2015-01-01

Jaanuaris 1961 Portugali diktaatorlikule režiimile protestiks kaaperdatud laevast "Santa Maria", mis sai omamoodi vabaduse ja vastuhaku sümboliks ka okupeeritud Eestis. Artiklis käsitletakse sellest sündmusest mõjutatud teoseid, täpsemalt Aleksander Suumanni maali "Santa Maria" ja Paul-Eerik Rummo samanimelist luuletust

Santa Gertrudis : Pétroglifo

OpenAIRE

Puaux , Olivier

1986-01-01

Las Milpillas ( site n°95 ), Santa Gertrudis, Municipio de Zacapu, Michoacán. Opéración 1. Groupo B. Estructura B1. Unidad Excavación Noroeste. Pétroglifo dibajo de los escombros, Fachaba Escalinatas. Coordenadas : 19°51'48" 101°49'.

Detailed mapping and rupture implications of the 1 km releasing bend in the Rodgers Creek Fault at Santa Rosa, northern California

Science.gov (United States)

Hecker, Suzanne; Langenheim, Victoria; Williams, Robert; Hitchcock, Christopher S.; DeLong, Stephen B.

2016-01-01

Airborne light detection and ranging (lidar) topography reveals for the first time the trace of the Rodgers Creek fault (RCF) through the center of Santa Rosa, the largest city in the northern San Francisco Bay area. Vertical deformation of the Santa Rosa Creek floodplain expresses a composite pull‐apart basin beneath the urban cover that is part of a broader 1‐km‐wide right‐releasing bend in the fault. High‐resolution geophysical data illuminate subsurface conditions that may be responsible for the complex pattern of surface faulting, as well as for the distribution of seismicity and possibly for creep behavior. We identify a dense, magnetic basement body bounded by the RCF beneath Santa Rosa that we interpret as a strong asperity, likely part of a larger locked patch of the fault to the south. A local increase in frictional resistance associated with the basement body appears to explain (1) distributed fault‐normal extension above where the RCF intersects the body; (2) earthquake activity around the northern end of the body, notably the 1969 ML 5.6 and 5.7 events and aftershocks; and (3) creep rates on the RCF that are higher to the north of Santa Rosa than to the south. There is a significant probability of a major earthquake on the RCF in the coming decades, and earthquakes associated with the proposed asperity have the potential to release seismic energy into the Cotati basin beneath Santa Rosa, already known from damaging historical earthquakes to produce amplified ground shaking.

Catalytic effect of light illumination on bioleaching of chalcopyrite.

Science.gov (United States)

Zhou, Shuang; Gan, Min; Zhu, Jianyu; Li, Qian; Jie, Shiqi; Yang, Baojun; Liu, Xueduan

2015-04-01

The influence of visible light exposure on chalcopyrite bioleaching was investigated using Acidithiobacillus ferrooxidans. The results indicated, in both shake-flasks and aerated reactors with 8500-lux light, the dissolved Cu was 91.80% and 23.71% higher, respectively, than that in the controls without light. The catalytic effect was found to increase bioleaching to a certain limit, then plateaued as the initial chalcopyrite concentration increased from 2% to 4.5%. Thus a balanced mineral concentration is highly amenable to bioleaching via offering increased available active sites for light adsorption while eschewing mineral aggregation and screening effects. Using semiconducting chalcopyrite, the light facilitated the reduction of Fe(3+) to Fe(2+) as metabolic substrates for A.ferrooxidans, leading to better biomass, lower pH and redox potential, which are conducive to chalcopyrite leaching. The light exposure on iron redox cycling was further confirmed by chemical leaching tests using Fe(3+), which exhibited higher Fe(2+) levels in the light-induced system. Copyright © 2015 Elsevier Ltd. All rights reserved.

Use of spermicide and impact of prophylactic condom use among sex workers in Santa Fe de Bogota, Colombia.

Science.gov (United States)

Farr, G; Acosta Castro, L A; DiSantostefano, R; Claassen, E; Olguin, F

1996-01-01

Condom use is one of the most important preventive measures sex workers can take to reduce the risk of becoming infected with a sexually transmitted disease. However, a client may refuse to use a condom when requested. Some sexually transmitted disease prevention programs are recommending that sex workers use spermicide as an alternative prophylaxis when a condom is refused, yet little is known about the effect of this recommendation on prophylactic condom use. To determine if using spermicide, either in conjunction with condoms or as a backup, influenced overall condom use among a group of sex workers at high risk of sexually transmitted diseases in Santa Fe de Bogota, Colombia. Participants were assigned randomly to one of three condom use groups: use of condoms only (Condoms Only), use of condoms and spermicides concurrently (Condom and Spermicide), or use of spermicide when condoms were refused (Spermicide as a Backup). A total of 199 sex workers entered the study and were asked to return for follow-up every 2 weeks for a period of 12 weeks. Women assigned to the Spermicide as a Backup group used a condom for an average of 78.1% of their reported acts of intercourse, compared with an average of 94.5% in the Condom Only and 92.3% in the Condom and Spermicide groups. However, women in the Spermicide as a Backup group used a condom or spermicide for an average of 96.9% of their acts of intercourse. Condoms were used for every intercourse act by less than 5% of the women in the Spermicide as a Backup groups, compared with 50.7% in the Condom Only group and 41.2% in the Condom and Spermicide group (P 0.001). When condoms were not used, client refusal was the primary reason reported. The incidence of sexually transmitted diseases and other urogenital inflammations in all groups was lower than expected. Among Colombian sex workers, condom use declined substantially when women were instructed to use spermicides if they were unable to persuade their partner to use a

Pelas trilhas da ILha de Santa Catarina

OpenAIRE

Silveira, Flavio Leonel Abreu da

1996-01-01

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Filosofia e Ciencias Humanas O estudo sobre o ecoturismo na Ilha de Santa Catarina vem demonstrar o surgimento de novas modalidades turísticas entre os grupos urbanos. A pesquisa aponta para a intersecção entre lazer, turismo, ecologia e esporte, demonstrando a importân-cia das práticas ecoturísticas na atualidade. A partir de tal perspectiva, as questões de gênero surgem com significativa relevância. Estamos frente...

Environmental application of millimetre-scale sponge iron (s-Fe"0) particles (IV): New insights into visible light photo-Fenton-like process with optimum dosage of H_2O_2 and RhB photosensitizers

International Nuclear Information System (INIS)

Ju, Yongming; Yu, Yunjiang; Wang, Xiaoyan; Xiang, Mingdeng; Li, Liangzhong; Deng, Dongyang; Dionysiou, Dionysios D.

2017-01-01

Highlights: • Synergistic action of Rhodamine B (RhB), visible light, H_2O_2 and s-Fe"0 is essential. • The complexes of RhB and Fe"3"+ eject one electron via ligand-to-metal charge-transfer. • RhB assists the photo-Fenton-like removal of tetrabromobisphenol A (TBBPA). - Abstract: In this study, we firstly develop the photo-Fenton-like system with millimetric sponge iron (s-Fe"0), H_2O_2, visible light (vis, λ ≥ 420 nm) and rhodamine B (RhB), and present a comprehensive study concerning the mechanism. Thus, we investigate (1) the adsorption of RhB onto s-Fe"0, (2) the photo-Fenton-like removal of RhB over iron oxides generated from the corrosion of s-Fe"0, (3) the homogeneous photo-Fenton removal of RhB over Fe"2"+ or Fe"3"+, (4) the Fe"3"+-RhB complexes, and (5) the photo-Fenton-like removal of tetrabromobisphenol A (TBBPA). The results show that neither the adsorption process over s-Fe"0 nor the photo-Fenton-like process over FeOOH, Fe_3O_4 and Fe_2O_3, achieved efficient removal of RhB. For comparison, in homogeneous photo-Fenton process, the presence of Fe"3"+ ions, rather than Fe"2"+ ions, effectively eliminated RhB. Furthermore, the UV–vis spectra showing new absorbance at ∼ 285 nm indicate the complexes of RhB and Fe"3"+ ions, adopting vis photons to form excited state and further eject one electron via ligand-to-metal charge-transfer to activate H_2O_2. Additionally, efficient TBBPA removal was obtained only in the presence of RhB. Accordingly, the s-Fe"0– based photo-Fenton-like process assisted with dyestuff wastewater is promising for removing a series of persistent organic pollutants.

Free inside: The Music Class at Santa Ana Jail

Science.gov (United States)

Fierro, Joe

2010-01-01

This article examines the workings of the music class at the Santa Ana Jail in Santa Ana, California. It gives us insight into a jail system and a music class focused on helping inmates position themselves to become productive members of society. In this article I examine how the facility encourages inmates' good behaviour and why the music class…

Physical data of soil profiles formed on late Quaternary marine terraces near Santa Cruz, California

Science.gov (United States)

Munster, Jennie; Harden, Jennifer W.

2002-01-01

last site selected, and this report contains minimal data on this terrace. Sites on the second, third, and fourth terraces are located in Wilder Ranch, Santa Cruz, California. Site five is on private property north of Wilder Ranch. Careful consideration was taken in selecting field sites, choosing locations in a topographically flat area to avoid effects of erosion, and trying to keep parent material similar. This report contains physical properties of the soil profiles on four of the five marine terraces near Santa Cruz, California, excluding the youngest terrace in all tables except 6 and 7. Data includes field descriptions, bulk density, grain size analyses, weight percent magnetic fraction, and the soil development index. Soil properties are important when trying to understand the chemistry of a given profile or when comparing profiles. Grain size constrains the movement of water in a profile, thus controlling movement of chemicals and weathering rates. Bulk density is a useful property to calculate chemical inventory. Quantifying the magnetic fraction aids in understanding the Fe inventory for these soils. The soil development index is a semi-quantitative way to define the degree of development of a soil profile. This is a useful way to compare development of profiles for this chronosequence or compare the Santa Cruz terraces to a suit of other terraces or another chronosequence.

Photoinduced spin-orientation transition dynamics in Fe2+ - containing Y3Fe5O12 monocrystals

International Nuclear Information System (INIS)

Kovalenko, V.F.; Kuts, P.S.; Lyakhimets, S.N.

1982-01-01

The kinetic equations describing Fe 2 + ion redistribution between orientation-nonequivalent sites in the Y 3 Fe 5 O 12 monocrystal under the action of linearly-polarized light are solved. The method proposed permits to find Fe 2 + ion distribution over four types of orientation-nonequivalent sites using an introduced matrix. The spin-redistribution transition is shown to have a threshold character. The expression allowing one to perform a quantitative calculation of the time of creation of the threshold unbalance tau, is obtained. It is shown that tau is dependent on the initial unbalance of site population. A conclusion is made on the existence of sectors, in which the polarization vector of irradiatino. light is oriented and photoinduced changes do not occur even at infinitely large values of illimination time and intensity. The analysis of the theoretical results obtained and their comparison with the existing experimental results show good agreement

Noteworthy bird records at Lagoa Santa, southeastern Brazil Registros notáveis de aves em Lagoa Santa, sudeste do Brasil

OpenAIRE

Marcos Rodrigues

2008-01-01

Lagoa Santa, a small town in southeastern Brazil where naturalist Peter Lund lived, is regarded nowadays as an important historical site for the biological sciences. From 1847 to 1855, J.T. Reinhardt, hosted by Lund, collected 343 bird species. This material is an outstanding reference for many modern ornithological studies. The present paper reports the occurrence of some rare and threatened birds for the region of Lagoa Santa between 1998 and 2005. In this account I list the Rusty-margined ...

California State Waters Map Series: offshore of Santa Barbara, California

Science.gov (United States)

Johnson, Samuel Y.; Dartnell, Peter; Cochrane, Guy R.; Golden, Nadine E.; Phillips, Eleyne L.; Ritchie, Andrew C.; Greene, H. Gary; Krigsman, Lisa M.; Kvitek, Rikk G.; Dieter, Bryan E.; Endris, Charles A.; Seitz, Gordon G.; Sliter, Ray W.; Erdey, Mercedes D.; Gutierrez, Carlos I.; Wong, Florence L.; Yoklavich, Mary M.; Draut, Amy E.; Hart, Patrick E.; Conrad, James E.; Cochran, Susan A.; Johnson, Samuel Y.; Cochran, Susan A.

2013-01-01

In 2007, the California Ocean Protection Council initiated the California Seafloor Mapping Program (CSMP), designed to create a comprehensive seafloor map of high-resolution bathymetry, marine benthic habitats, and geology within the 3-nautical-mile limit of California’s State Waters. The CSMP approach is to create highly detailed seafloor maps through collection, integration, interpretation, and visualization of swath sonar data, acoustic backscatter, seafloor video, seafloor photography, high-resolution seismic-reflection profiles, and bottom-sediment sampling data. The map products display seafloor morphology and character, identify potential marine benthic habitats, and illustrate both the surficial seafloor geology and shallow (to about 100 m) subsurface geology. The Offshore of Santa Barbara map area lies within the central Santa Barbara Channel region of the Southern California Bight. This geologically complex region forms a major biogeographic transition zone, separating the cold-temperate Oregonian province north of Point Conception from the warm-temperate California province to the south. The map area is in the southern part of the Western Transverse Ranges geologic province, which is north of the California Continental Borderland. Significant clockwise rotation—at least 90°—since the early Miocene has been proposed for the Western Transverse Ranges province, and geodetic studies indicate that the region is presently undergoing north-south shortening. Uplift rates (as much as 2.2 mm/yr) that are based on studies of onland marine terraces provide further evidence of significant shortening. The city of Santa Barbara, the main coastal population center in the map area, is part of a contiguous urban area that extends from Carpinteria to Goleta. This urban area was developed on the coalescing alluvial surfaces, uplifted marine terraces, and low hills that lie south of the east-west-trending Santa Ynez Mountains. Several beaches line the actively

Degradation of atenolol via heterogeneous activation of persulfate by using BiOCl@Fe3O4 catalyst under simulated solar light irradiation.

Science.gov (United States)

Shi, Yahong; Chen, Hongche; Wu, Yanlin; Dong, Wenbo

2018-01-01

Efficient oxidative degradation of pharmaceutical pollutants in aquatic environments is of great importance. This study used magnetic BiOCl@Fe 3 O 4 catalyst to activate persulfate (PS) under simulated solar light irradiation. This degradation system was evaluated using atenolol (ATL) as target pollutant. Four reactive species were identified in the sunlight/BiOCl@Fe 3 O 4 /PS system. The decreasing order of the contribution of each reactive species on ATL degradation was as follows: h +  ≈ HO ·  > O 2 ·-  > SO 4 ·- . pH significantly influenced ATL degradation, and an acidic condition favored the reaction. High degradation efficiencies were obtained at pH 2.3-5.5. ATL degradation rate increased with increased catalyst and PS contents. Moreover, ATL mineralization was higher in the sunlight/BiOCl@Fe 3 O 4 /PS system than in the sunlight/BiOCl@Fe 3 O 4 or sunlight/PS system. Nine possible intermediate products were identified through LC-MS analysis, and a degradation pathway for ATL was proposed. The BiOCl@Fe 3 O 4 nanomagnetic composite catalyst was synthesized in this work. This catalyst was easily separated and recovered from a treated solution by using a magnet, and it demonstrated a high catalytic activity. Increased amount of the BiOCl@Fe 3 O 4 catalyst obviously accelerated the efficiency of ATL degradation, and the reusability of the catalyst allowed the addition of a large dosage of BiOCl@Fe 3 O 4 to improve the degradation efficiency.

Visible light photocatalytic activities of ZnFe{sub 2}O{sub 4}/ZnO nanoparticles for the degradation of organic pollutants

Energy Technology Data Exchange (ETDEWEB)

Rameshbabu, R. [SRM Research Institute, SRM University, Kattankulathur, Kanchipuram 603203, Tamil Nadu (India); Kumar, Niraj [SRM Research Institute, SRM University, Kattankulathur, Kanchipuram 603203, Tamil Nadu (India); Centre for Materials Science and Nano Devices, Department of Physics and Nanotechnology, SRM University Kattankulathur, Kanchipuram 603203, Tamil Nadu (India); Karthigeyan, A., E-mail: karthigeyan.a@ktr.srmuniv.ac.in [Centre for Materials Science and Nano Devices, Department of Physics and Nanotechnology, SRM University Kattankulathur, Kanchipuram 603203, Tamil Nadu (India); Neppolian, B., E-mail: neppolian.b@res.srmuniv.ac.in [SRM Research Institute, SRM University, Kattankulathur, Kanchipuram 603203, Tamil Nadu (India)

2016-09-15

ZnFe{sub 2}O{sub 4}/ZnO nanoparticles have been synthesized by co-precipitation method using polyvinyl alcohol (PVA) as surfactant. The phase formation of synthesized products was systematically investigated from powder X-ray diffraction. Cubic ZnFe{sub 2}O{sub 4} and hexagonal ZnO were identified in accordance with different molar concentrations of Fe{sup 3+} ions. The morphology and functionality were analyzed using field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectroscopy. The optical properties and change in the band gap from UV to visible region upon increasing molar concentration of Fe{sup 3+} ions were analyzed from diffuse reflectance spectra (DRS). Superparamagnetic property was observed for synthesized ZnFe{sub 2}O{sub 4}/ZnO nanoparticles using vibrating sample magnetometer (VSM). The methylene blue and methyl orange were taken as model dyes to illustrate the photocatalytic activity of synthesized products under visible light irradiation. Maximum degradation of 99% for methyl orange (MO) was achieved by the use of 13 nm sized ZnFe{sub 2}O{sub 4}/ZnO nanoparticles as catalyst and a minutely less activity was observed for the methylene blue (MB) degradation (98%), when the photocatalytic processes were carried out for 5 h and 6 h, respectively. - Highlights: • Co-precipitation method is proposed to synthesize magnetic nanoparticles. • Modifications in the molar concentration lead to the shift in absorption edge. • Superparamagnetic property is demonstrated for the nanoparticles. • Two dye pollutants are utilized to demonstrate the photocatalytic activity.

UV Light-Driven Photodegradation of Methylene Blue by Using Mn0.5Zn0.5Fe2O4/SiO2 Nanocomposites

Science.gov (United States)

Indrayana, I. P. T.; Julian, T.; Suharyadi, E.

2018-04-01

The photodegradation activity of nanocomposites for 20 ppm methylene blue solution has been investigated in this work. Nanocomposites Mn0.5Zn0.5Fe2O4/SiO2 have been synthesized using coprecipitation method. The X-ray diffraction (XRD) pattern confirmed the formation of three phases in sample Mn0.5Zn0.5Fe2O4/SiO2 i.e., Mn0.5Zn0.5Fe2O4, Zn(OH)2, and SiO2. The appearance of SiO2 phase showed that the encapsulation process has been carried out. The calculated particles size of Mn0.5Zn0.5Fe2O4/SiO2 is greater than Mn0.5Zn0.5Fe2O4. Bonding analysis via vibrational spectra for Mn0.5Zn0.5Fe2O4/SiO2 confirmed the formation of bonds Me-O-Si stretching (2854.65 cm-1) and Si-O-Si asymmetric stretching (1026.13 cm-1). The optical gap energy of Mn0.5Zn0.5Fe2O4/SiO2 was smaller (2.70 eV) than Mn0.5Zn0.5Fe2O4 (3.04 eV) due to smaller lattice dislocation and microstrain that affect their electronic structure. The Mn0.5Zn0.5Fe2O4/SiO2 showed high photodegradation ability due to smaller optical gap energy and the appearance of SiO2 ligand that can easily attract dye molecules. The Mn0.5Zn0.5Fe2O4/SiO2 also showed high degradation activity even without UV light radiation. The result showed that photodegradation reaction doesn’t follow pseudo-first order kinetics.

Sediment Dynamics Affecting the Threatened Santa Ana Sucker in the Highly-modified Santa Ana River and Inset Channel, Southern California, USA

Science.gov (United States)

Minear, J. T.; Wright, S. A.

2015-12-01

In this study, we investigate the sediment dynamics of the low-flow channel of the Santa Ana River that is formed by wastewater discharges and contains some of the last remaining habitat of the Santa Ana Sucker (Catostomus santaanae). The Santa Ana River is a highly-modified river draining the San Bernardino Mountains and Inland Empire metropolitan area east of Los Angeles. Home to over 4 million people, the watershed provides habitat for the federally-threatened Santa Ana Sucker, which presently reside within the mainstem Santa Ana River in a reach supported by year-round constant discharges from water treatment plants. The nearly constant low-flow wastewater discharges and infrequent runoff events create a small, approximately 8 m wide, inset channel within the approximately 300 m wide mainstem channel that is typically dry except for large flood flows. The sediment dynamics within the inset channel are characterized by constantly evolving bed substrate and sediment transport rates, and occasional channel avulsions. The sediment dynamics have large influence on the Sucker, which rely on coarse-substrate (gravel and cobble) for their food production. In WY 2013 through the present, we investigated the sediment dynamics of the inset channel using repeat bathymetric and substrate surveys, bedload sampling, and discharge measurements. We found two distinct phases of the inset channel behavior: 1. 'Reset' flows, where sediment-laden mainstem discharges from upstream runoff events result in sand deposition in the inset channel or avulse the inset channel onto previously dry riverbed; and 2. 'Winnowing' flows, whereby the sand within the inset channel is removed by clear-water low flows from the wastewater treatment plant discharges. Thus, in contrast to many regulated rivers where high flows are required to flush fine sediments from the bed (for example, downstream from dams), in the Santa Ana River the low flows from wastewater treatment plants serve as the flushing

Magnetically separable CuFe{sub 2}O{sub 4}/AgBr composite photocatalysts: Preparation, characterization, photocatalytic activity and photocatalytic mechanism under visible light

Energy Technology Data Exchange (ETDEWEB)

Zhao, Yalei; Lin, Cuiping; Bi, Huijie; Liu, Yonggang; Yan, Qishe, E-mail: Qisheyanzzu@163.com

2017-01-15

Highlights: • CuFe{sub 2}O{sub 4}/AgBr composites were prepared by a facile sol-gel and hydrothermal method. • Visible-light response and high photocatalytic performance. • Excellent magnetic properties. • Different reactive species had different effects on degradation different pollutants. - Abstract: The CuFe{sub 2}O{sub 4} and CuFe{sub 2}O{sub 4}/AgBr composites with different CuFe{sub 2}O{sub 4} contents were prepared by a facile sol-gel and hydrothermal method, respectively. The as-synthesized photocatalysts were characterized by means of powder X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), and UV–vis diffuse reflectance spectrum (UV–vis DRS). Their magnetic properties, photocatalytic degradation activities on methyl orange (MO) and tetracycline hydrochloride (TC) solution and photocatalytic mechanism were investigated in detail. The results revealed that the CuFe{sub 2}O{sub 4}/AgBr composites exhibited significantly higher photocatalytic activities than the pure CuFe{sub 2}O{sub 4}. The enhanced photocatalytic activity could be attributed to the matched band structure of two components and more effective charge transportation and separations. In addition, the quenching investigation of different scavengers demonstrated that h{sup +}, ·OH, ·O{sub 2}{sup −} reactive species played different roles in the decolorization of MO and degradation of TC.

Recyclable magnetic photocatalysts of Fe2+/TiO2 hierarchical architecture with effective removal of Cr(VI) under UV light from water

International Nuclear Information System (INIS)

Xu, S.C.; Zhang, Y.X.; Pan, S.S.; Ding, H.L.; Li, G.H.

2011-01-01

Highlights: ► Fe 2+ /TiO 2 catalyst has a three-level hierarchical architecture. ► With a removal effectiveness of 99.3% at Cr(VI) concentration of 10 mg L −1 . ► Two-step reduction: TiO 2 photoreduces Fe 2+ to Fe and Fe reduces Cr(VI) to Cr(III). ► Hierarchical architecture serves as both photocatalytic reactor and absorbent. ► Fe 2+ /TiO 2 catalyst can be magnetically separated from wastewater and recycled. - Abstract: We report the synthesis and photocatalytic removal of Cr(VI) from water of hierarchical micro/nanostructured Fe 2+ /TiO 2 tubes. The TiO 2 tubes fabricated by a facile solvothermal approach show a three-level hierarchical architecture assembled from dense nanosheets nearly vertically standing on the surface of TiO 2 microtube. The nanosheets with a thickness of about 20 nm are composed of numerous TiO 2 nanocrystals with size in the range of 15–20 nm. Ferrous ions are doped into the hierarchical architecture by a reduction route. The Fe 2+ /TiO 2 catalyst demonstrates an effective removal of Cr(VI) from water under UV light and the removal effectiveness reaches 99.3% at the initial Cr(VI) concentration of 10 mg L −1 . The ferrous ion in the catalyst serves not as the photo-electron trap but as an intermedium of a two-step reduction. The TiO 2 photoreduces the Fe 2+ ions to Fe atoms firstly, then the Fe atoms reduce the Cr(VI) to Cr(III), and the later is removed by adsorption. The hierarchical architecture of the catalyst serves as a reactor for the photocatalytic reaction of Cr(VI) ions and an effective absorbent for the removal of Cr(III) ions. The catalyst can be easily magnetically separated from the wastewater after photocatalytic reaction and recycled after acid treatment.

Level Densities and Radiative Strength Functions in ⁵⁶FE and ⁵⁷FE

Energy Technology Data Exchange (ETDEWEB)

Tavukcu, Emel [North Carolina State Univ., Raleigh, NC (United States)

2002-12-10

Understanding nuclear level densities and radiative strength functions is important for pure and applied nuclear physics. Recently, the Oslo Cyclotron Group has developed an experimental method to extract level densities and radiative strength functions simultaneously from the primary γ rays after a light-ion reaction. A primary γ-ray spectrum represents the γ-decay probability distribution. The Oslo method is based on the Axel-Brink hypothesis, according to which the primary γ-ray spectrum is proportional to the product of the level density at the final energy and the radiative strength function. The level density and the radiative strength function are fit to the experimental primary γ-ray spectra, and then normalized to known data. The method works well for heavy nuclei. The present measurements extend the Oslo method to the lighter mass nuclei ⁵⁶Fe and ⁵⁷Fe. The experimental level densities in ⁵⁶Fe and ⁵⁷Fe reveal step structure. This step structure is a signature for nucleon pair breaking. The predicted pairing gap parameter is in good agreement with the step corresponding to the first pair breaking. Thermodynamic quantities for ⁵⁶Fe and ⁵⁷Fe are derived within the microcanonical and canonical ensembles using the experimental level densities. Energy-temperature relations are considered using caloric curves and probability density functions. The differences between the thermodynamics of small and large systems are emphasized. The experimental heat capacities are compared with the recent theoretical calculations obtained in the Shell Model Monte Carlo method. Radiative strength functions in ⁵⁶Fe and ⁵⁷Fe have surprisingly high values at low γ-ray energies. This behavior has not been observed for heavy nuclei, but has been observed in other light- and medium-mass nuclei. The origin of this low γ-ray energy effect remains unknown.

Early Neogene unroofing of the Sierra Nevada de Santa Marta along the Bucaramanga -Santa Marta Fault

Science.gov (United States)

Piraquive Bermúdez, Alejandro; Pinzón, Edna; Bernet, Matthias; Kammer, Andreas; Von Quadt, Albrecht; Sarmiento, Gustavo

2016-04-01

Plate interaction between Caribbean and Nazca plates with Southamerica gave rise to an intricate pattern of tectonic blocks in the Northandean realm. Among these microblocks the Sierra Nevada de Santa Marta (SNSM) represents a fault-bounded triangular massif composed of a representative crustal section of the Northandean margin, in which a Precambrian to Late Paleozoic metamorphic belt is overlain by a Triassic to Jurassic magmatic arc and collateral volcanic suites. Its western border fault belongs to the composite Bucaramanga - Santa Marta fault with a combined left lateral-normal displacement. SE of Santa Marta it exposes remnants of an Oligocene marginal basin, which attests to a first Cenoizoic activation of this crustal-scale lineament. The basin fill consists of a sequence of coarse-grained cobble-pebble conglomerates > 1000 m thick that unconformably overlay the Triassic-Jurassic magmatic arc. Its lower sequence is composed of interbedded siltstones; topwards the sequence becomes dominated by coarser fractions. These sedimentary sequences yields valuable information about exhumation and coeval sedimentation processes that affected the massif's western border since the Upper Eocene. In order to analyse uplifting processes associated with tectonics during early Neogene we performed detrital zircon U-Pb geochronology, detrital thermochronology of zircon and apatites coupled with the description of a stratigraphic section and its facies composition. We compared samples from the Aracataca basin with analog sequences found at an equivalent basin at the Oca Fault at the northern margin of the SNSM. Our results show that sediments of both basins were sourced from Precambrian gneisses, along with Mesozoic acid to intermediate plutons; sedimentation started in the Upper Eocene-Oligocene according to palynomorphs, subsequently in the Upper Oligocene a completion of Jurassic to Cretaceous sources was followed by an increase of Precambrian input that became the dominant

Reductive and oxidative degradation of iopamidol, iodinated X-ray contrast media, by Fe(III)-oxalate under UV and visible light treatment.

Science.gov (United States)

Zhao, Cen; Arroyo-Mora, Luis E; DeCaprio, Anthony P; Sharma, Virender K; Dionysiou, Dionysios D; O'Shea, Kevin E

2014-12-15

Iopamidol, widely employed as iodinated X-ray contrast media (ICM), is readily degraded in a Fe(III)-oxalate photochemical system under UV (350 nm) and visible light (450 nm) irradiation. The degradation is nicely modeled by pseudo first order kinetics. The rates of hydroxyl radical (OH) production for Fe(III)-oxalate/H2O2/UV (350 nm) and Fe(III)-oxalate/H2O2/visible (450 nm) systems were 1.19 ± 0.12 and 0.30 ± 0.01 μM/min, respectively. The steady-state concentration of hydroxyl radical (OH) for the Fe(III)-oxalate/H2O2/UV (350 nm) conditions was 10.88 ± 1.13 × 10(-14) M and 2.7 ± 0.1 × 10(-14) M for the Fe(III)-oxalate/H2O2/visible (450 nm). The rate of superoxide anion radical (O2(-)) production under Fe(III)-oxalate/H2O2/UV (350 nm) was 0.19 ± 0.02 μM/min with a steady-state concentration of 5.43 ± 0.473 × 10(-10) M. Detailed product studies using liquid chromatography coupled to Q-TOF/MS demonstrate both reduction (multiple dehalogenations) and oxidation (aromatic ring and side chains) contribute to the degradation pathways. The reduction processes appear to be initiated by the carbon dioxide anion radical (CO2(-)) while oxidation processes are consistent with OH initiated reaction pathways. Unlike most advanced oxidation processes the Fe(III)-oxalate/H2O2/photochemical system can initiate to both reductive and oxidative degradation processes. The observed reductive dehalogenation is an attractive remediation strategy for halogenated organic compounds as the process can dramatically reduce the formation of the problematic disinfection by-products often associated with oxidative treatment processes. Copyright © 2014 Elsevier Ltd. All rights reserved.

Smooth and rapid microwave synthesis of MIL-53(Fe) including superparamagnetic γ-Fe2O3 nanoparticles

Science.gov (United States)

Wengert, Simon; Albrecht, Joachim; Ruoss, Stephen; Stahl, Claudia; Schütz, Gisela; Schäfer, Ronald

2017-12-01

MIL-53(Fe) linked to superparamagnetic γ-Fe2O3 nanoparticles was created using time-efficient microwave synthesis. Intermediates as well as the final product have been characterized by Dynamic Light Scattering (DLS), Infrared Spectroscopy (FTIR) and Thermal Gravimetric Analysis (TGA). It is found that this route allows the production of Fe nanoparticles with typical sizes of about 80 nm that are embedded inside the metal-organic structures. Detailed magnetization measurements using SQUID magnetometry revealed a nearly reversible magnetization loop indicating essentially superparamagnetic behavior.

Fabrication of a magnetic nanocomposite photocatalysts Fe3O4@ZIF-67 for degradation of dyes in water under visible light irradiation

Science.gov (United States)

Guan, Weihua; Gao, Xuechuan; Ji, Guanfeng; Xing, Yongxing; Du, Chunfang; Liu, Zhiliang

2017-11-01

As organic dyes are a major group of water pollutants, the development of materials for the removal of dyes is of great significance for the environment. Here, a novel flower-like Fe3O4@ZIF-67 photocatalyst was synthesized using a simple method at room temperature. It was found that the Fe3O4@ZIF-67 exhibited the ability of degrading Congo red (CR) quickly under visible light irradiation in a short time after adsorption equilibrium. Free radical trapping experiments revealed that the photo-induced active species superoxide radical (•O2-) and holes (h+) were the predominant active species in the photocatalytic system. In addition, results demonstrated that the Fe3O4@ZIF-67 can be magnetically recycled, and maintain high photocatalytic activity after reuse over five cycles with no obvious decrease in the removal efficiency. It suggested that the synthesized material had a potentially promising application for CR removal from waste water.

Synthesis of ternary g-C3N4/Ag/γ-FeOOH photocatalyst: An integrated heterogeneous Fenton-like system for effectively degradation of azo dye methyl orange under visible light

Science.gov (United States)

He, Donglin; Chen, Yanfeng; Situ, Yue; Zhong, Li; Huang, Hong

2017-12-01

g-C3N4/Ag/γ-FeOOH photocatalyst was prepared and the synergy of photocatalysis with heterogeneous Fenton-like process was measured by degrading methyl Orange(MO). g-C3N4 can apply electron for γ-FeOOH to change Fe3+ to Fe2+, and γ-FeOOH can help g-C3N4 to enhance the absorption of visible light. The Ag nanoparticles were photo deposited on the layer of γ-FeOOH and g-C3N4 for the separation of electron-holes. g-C3N4(5%)/Ag/γ-FeOOH showed the great ability to degrade MO, and the optimal concentration of H2O2, the effect of pH and the stability of the photocatalyst and synergistic mechanism of photocatalysity with heterogeneous Fenton-like process were also discussed in this study.

Brillouin light scattering study of spin waves in NiFe/Co exchange spring bilayer films

Energy Technology Data Exchange (ETDEWEB)

Haldar, Arabinda; Banerjee, Chandrima; Laha, Pinaki; Barman, Anjan, E-mail: abarman@bose.res.in [Thematic Unit of Excellence on Nanodevice Technology, Department of Condensed Matter Physics and Material Sciences, S. N. Bose National Centre for Basic Sciences, Kolkata 700098 (India)

2014-04-07

Spin waves are investigated in Permalloy(Ni{sub 80}Fe{sub 20})/Cobalt(Co) exchange spring bilayer thin films using Brillouin light scattering (BLS) experiment. The magnetic hysteresis loops measured by magneto-optical Kerr effect show a monotonic decrease in coercivity of the bilayer films with increasing Py thickness. BLS study shows two distinct modes, which are modelled as Damon-Eshbach and perpendicular standing wave modes. Linewidths of the frequency peaks are found to increase significantly with decreasing Py layer thickness. Interfacial roughness causes to fluctuate exchange coupling at the nanoscale regimes and the effect is stronger for thinner Py films. A quantitative analysis of the magnon linewidths shows the presence of strong local exchange coupling field which is much larger compared to macroscopic exchange field.

Streamflow in the upper Santa Cruz River basin, Santa Cruz and Pima Counties, Arizona

Science.gov (United States)

Condes de la Torre, Alberto

1970-01-01

Streamflow records obtained in the upper Santa Cruz River basin of southern Arizona, United States, and northern Sonora, Mexico, have been analyzed to aid in the appraisal of the surface-water resources of the area. Records are available for 15 sites, and the length of record ranges from 60 years for the gaging station on the Santa .Cruz River at Tucson to 6 years for Pantano Wash near Vail. The analysis provides information on flow duration, low-flow frequency magnitude, flood-volume frequency and magnitude, and storage requirements to maintain selected draft rates. Flood-peak information collected from the gaging stations has been projected on a regional basis from which estimates of flood magnitude and frequency may be made for any site in the basin. Most streams in the 3,503-square-mile basin are ephemeral. Ground water sustains low flows only at Santa Cruz River near Nogales, Sonoita Creek near Patagonia, and Pantano Wash near Vail. Elsewhere, flow occurs only in direct response to precipitation. The median number of days per year in which there is no flow ranges from 4 at Sonoita Creek near Patagonia to 335 at Rillito Creek near Tomson. The streamflow is extremely variable from year to year, and annual flows have a coefficient of variation close to or exceeding unity at most stations. Although the amount of flow in the basin is small most of the time, the area is subject to floods. Most floods result from high-intensity precipitation caused by thunderstorms during the period ,July to September. Occasionally, when snowfall at the lower altitudes is followed by rain, winter floods produce large volumes of flow.

Metal organic framework g-C3N4/MIL-53(Fe) heterojunctions with enhanced photocatalytic activity for Cr(VI) reduction under visible light

Science.gov (United States)

Huang, Wenyuan; Liu, Ning; Zhang, Xiaodong; Wu, Minghong; Tang, Liang

2017-12-01

In this study, hybrid nanocomposites based on Fe-based MOF and graphitic carbon nitride (g-C3N4) were developed by a facile solvothermal method. The as-prepared materials were characterized by XRD, FESEM, TEM, XPS and PL analysis. It was showed that the introduction of a certain amount of g-C3N4 on the surface of MIL-53(Fe) would improve the separation and migration rate of photo-induced charges, consequently resulting in the boost of photocatalytic efficiency. Compared with g-C3N4 and MIL-53(Fe), the CMFe composites displayed more excellent visible light-resposive photocatalytic activity for the reduction of Cr(VI). The optimal doping content of g-C3N4 in g-C3N4/MIL-53(Fe) composite was determined to be 3.0 wt%, and it showed about 2.1 and 2.0 times as high photocatalytic efficiency for the reduction of Cr(VI) as that of pure g-C3N4 and MIL-53(Fe), respectively. Meanwhile, the composite exhibited good reusability and stability in the process of cyclic experiments. A possible photocatalytic reaction mechanism was also investigated in detail by the related electrochemical analysis.

Recuento de bacterias totales en leche cruda de tambos que caracterizan la zona noroeste de Santa Fe y sur de Santiago del Estero Total bacterial count in raw milk of dairy farms that characterize the northwest zone of Santa Fe and south of Santiago del Estero

Directory of Open Access Journals (Sweden)

G.R. Revelli

2004-09-01

Full Text Available Un total de 6.998 muestras de leche cruda de pool de tanque, correspondientes a 55 establecimientos lecheros asociados a la Cooperativa Tambera Nueva Alpina Ltda., fueron recolectadas entre los años 1993 y 2002. Se realizó el Recuento de Microorganismos Aerobios Mesófilos Totales, obteniéndose como resultado un valor medio de 1,2 x 105± 2,4 x 105UFC/ml que caracteriza la zona. El año de finalización de la experiencia, se observó un 97% de los tambos evaluados con promedios £ 1,0 x 105UFC/ml. Solamente un 3% sobrepasa este límite, no encontrándose establecimientos con niveles superiores a 1,5 x 105UFC/ml. Al relacionar este indicador con parámetros composicionales, las correlaciones más significativas resultaron para: Recuento de Bacterias Totales vs Acidez (r = 0,292; P A total of 6.998 raw milk samples of bulk tank, belonging to 55 dairy farms associated to the Cooperativa Tambera Nueva Alpina Ltda., were collected between the years 1993 and 2002. The Total Mesophilic Aerobic Microorganisms Count was analyzed, obtaining a medium value of 1.2 x 105± 2.4 x 105CFU/ml that characterizes the zone. The final year of experience, observed a 97% of dairy farms evaluated with averages £ 1,0 x 105CFU/ml. Only a 3% it surpasses this limit, not being found establishments with levels over 1.5 x 105CFU/ml. Relating this indicators with compositionals parameters, the most significant correlation resulted for: Total Bacterial Count vs Acidity (r = 0.292; P < 0.001 and Total Bacterial Count vs Freezing Point (r = 0.157; P < 0.001. The microbiological quality in raw milk of dairy farms belonging to the northwest zone of Santa Fe and south of Santiago del Estero showed a significant improvement during this time.

78 FR 47007 - National Environmental Policy Act; Santa Susana Field Laboratory

Science.gov (United States)

2013-08-02

... project Web site address listed below. http://www.nasa.gov/agency/nepa/news/SSFL.html . ADDRESSES...; Santa Susana Field Laboratory AGENCY: National Aeronautics and Space Administration (NASA). ACTION... Environmental Cleanup Activities for the NASA-administered portion of the Santa Susana Field Laboratory (SSFL...

Influence of organics and silica on Fe(II) oxidation rates and cell-mineral aggregate formation by the green-sulfur Fe(II)-oxidizing bacterium Chlorobium ferrooxidans KoFox - Implications for Fe(II) oxidation in ancient oceans

Science.gov (United States)

Gauger, Tina; Byrne, James M.; Konhauser, Kurt O.; Obst, Martin; Crowe, Sean; Kappler, Andreas

2016-06-01

Most studies on microbial phototrophic Fe(II) oxidation (photoferrotrophy) have focused on purple bacteria, but recent evidence points to the importance of green-sulfur bacteria (GSB). Their recovery from modern ferruginous environments suggests that these photoferrotrophs can offer insights into how their ancient counterparts grew in Archean oceans at the time of banded iron formation (BIF) deposition. It is unknown, however, how Fe(II) oxidation rates, cell-mineral aggregate formation, and Fe-mineralogy vary under environmental conditions reminiscent of the geological past. To address this, we studied the Fe(II)-oxidizer Chlorobium ferrooxidans KoFox, a GSB living in co-culture with the heterotrophic Geospirillum strain KoFum. We investigated the mineralogy of Fe(III) metabolic products at low/high light intensity, and in the presence of dissolved silica and/or fumarate. Silica and fumarate influenced the crystallinity and particle size of the produced Fe(III) minerals. The presence of silica also enhanced Fe(II) oxidation rates, especially at high light intensities, potentially by lowering Fe(II)-toxicity to the cells. Electron microscopic imaging showed no encrustation of either KoFox or KoFum cells with Fe(III)-minerals, though weak associations were observed suggesting co-sedimentation of Fe(III) with at least some biomass via these aggregates, which could support diagenetic Fe(III)-reduction. Given that GSB are presumably one of the most ancient photosynthetic organisms, and pre-date cyanobacteria, our findings, on the one hand, strengthen arguments for photoferrotrophic activity as a likely mechanism for BIF deposition on a predominantly anoxic early Earth, but, on the other hand, also suggest that preservation of remnants of Fe(II)-oxidizing GSB as microfossils in the rock record is unlikely.

Preparation and visible light responsive photocatalytic activity of Fe{sub 3}O{sub 4}/Ni-Al-Ce LDH/Bi{sub 2}WO{sub 6} composites

Energy Technology Data Exchange (ETDEWEB)

Hao, Jiaqi; Qu, Ting; Wang, Qiufeng; Zhao, Zhenbo, E-mail: zhaozhenbo@ccut.edu.cn [School of Chemistry and Life Science, Changchun University of Technology, Changchun, Jilin (China)

2017-09-15

Novel Fe{sub 3}O{sub 4}/Ni-Al-Ce LDH/Bi{sub 2}WO{sub 6} composites were prepared through a hydrothermal method and co-precipitation method. The morphologies and structures of the photocatalysts were characterized by XRD, Raman, TEM, UV-vis-DRS, BET surface area and VSM techniques. The photocatalytic performances of the photocatalysts were investigated by the decolorisation of methyl orange (MO) under visible-light irradiation. The results showed that the Fe{sub 3}O{sub 4}/Ni-Al-Ce LDH/Bi{sub 2}WO{sub 6} composites exhibited greater photocatalytic activities compared to pure Bi{sub 2}WO{sub 6} and the Ni-Al-Ce LDH; the decolorisation rate of MO was 87% within 60 min under visible-light irradiation. The decolorisation efficiency of the composite material remained at 71% after 4 recycling runs, showing improved stability. Furthermore, the experimental results also showed that the photocatalytic reactions for the composites followed first-order reaction kinetics. Therefore, the Fe{sub 3}O{sub 4}/Ni-Al-Ce LDH/Bi{sub 2}WO{sub 6} composites were photocatalysts with high efficiencies and stabilities for a photocatalytic reaction of an organic pollutant, and this study provides a new, effective method for the development of wastewater treatment. (author)

Developing and Validating a Santa Ana Wildfire Threat Index

Science.gov (United States)

Capps, S. B.; Rolinski, T.; DAgostino, B.; Vanderburg, S.; Fovell, R. G.; Cao, Y.

2014-12-01

Santa Ana winds, common to southern California during the fall through spring, are a type of katabatic wind that originates from a direction generally ranging from 360°/0° to 100° and is usually accompanied by very low humidity. Since fuel conditions tend to be driest from late September through the middle of November, Santa Ana winds occurring during this period have the greatest potential to produce large, devastating fires when an ignition occurs. Such catastrophic fires occurred in 1993, 2003, 2007, and 2008. Because of the destructive nature of these fires, there has been a growing desire to categorize Santa Ana wind events in much the same way that tropical cyclones have been categorized. The Santa Ana Wildfire Threat index (SAWT) is an attempt to categorize such events with respect to fire activity, based on surface wind velocity, dew point depression, and forecasted fuel conditions. The index, a USDA Forest Service product, was developed by the Forest Service in collaboration with San Diego Gas and Electric Utility (SDG&E), the Department of Atmospheric and Oceanic Sciences at UCLA, The Desert Research Institute (DRI), and Vertum Partners. The methodology behind the SAWT index, along with the index itself will be presented in detail. Also, there will be a discussion on the construction of a 30-year climatology of the index, which includes various meteorological and fuel parameters. We will demonstrate the usefulness of the index as another decision support tool for fire agencies and first responders, and how it could assist the general public and private industry in the preparation of critical Santa Ana wind events.

Santa Lucia (2008) (L6) Chondrite, a Recent Fall: Composition, Noble Gases, Nitrogen and Cosmic Ray Exposure Age

Science.gov (United States)

Mahajan, Ramakant R.; Varela, Maria Eugenia; Joron, Jean Louis

2016-04-01

The Santa Lucia (2008)—one the most recent Argentine meteorite fall, fell in San Juan province, Argentina, on 23 January 2008. Several masses (total ~6 kg) were recovered. Most are totally covered by fusion crust. The exposed interior is of light-grey colour. Chemical data [olivine (Fa24.4) and low-Ca pyroxene (En77.8 Fs20.7 Wo1.6)] indicate that Santa Luica (2008) is a member of the low iron L chondrite group, corresponding to the equilibrated petrologic type 6. The meteorite name was approved by the Nomenclature Committee (NomCom) of the Meteoritical Society (Meteoritic Bulletin, no. 97). We report about the chemical composition of the major mineral phases, its bulk trace element abundance, its noble gas and nitrogen data. The cosmic ray exposure age based on cosmogenic 3He, 21Ne, and 38Ar around 20 Ma is comparable to one peak of L chondrites. The radiogenic K-Ar age of 2.96 Ga, while the young U, Th-He are of 1.2 Ga indicates that Santa Lucia (2008) lost radiogenic 4He more recently. Low cosmogenic (22Ne/21Ne)c and absence of solar wind noble gases are consistent with irradiation in a large body. Heavy noble gases (Ar/Kr/Xe) indicated trapped gases similar to ordinary chondrites. Krypton and neon indicates irradiation in large body, implying large pre-atmospheric meteoroid.

75 FR 81846 - Expansion of the Santa Maria Valley Viticultural Area

Science.gov (United States)

2010-12-29

... decision. SUMMARY: This Treasury decision expands the Santa Maria Valley viticultural area in Santa Barbara... may purchase. DATES: Effective Date: January 28, 2011. FOR FURTHER INFORMATION CONTACT: Elisabeth C... origin of their wines to consumers and helps consumers to identify wines they may purchase. Establishment...

78 FR 55763 - National Environmental Policy Act; Santa Susana Field Laboratory

Science.gov (United States)

2013-09-11

... document format at http://www.nasa.gov/agency/nepa/news/SSFL.html . The Federal Register Notice of Intent...; Santa Susana Field Laboratory AGENCY: National Aeronautics and Space Administration (NASA). ACTION... Demolition and Environmental Cleanup Activities for the NASA-administered portion of the Santa Susana Field...

X-Ray Magnetic Dichroism of Antiferromagnet Fe2O3 : The Orientation of Magnetic Moments Observed by Fe 2p X-Ray Absorption Spectroscopy

NARCIS (Netherlands)

Kuiper, Pieter; Searle, Barry G.; Rudolf, Petra; Tjeng, L.H.; Chen, C.T.

1993-01-01

We report strong magnetic linear dichroism at the Fe L2,3 edge of the antiferromagnet Fe2O3 (hematite). The relative difference in absorption for light polarized parallel and perpendicular to the magnetic moment is as high as 40% at the Fe L2 edge. The spectra are in excellent agreement with

Anti-fish bacterial pathogen effect of visible light responsive Fe{sub 3}O{sub 4}@TiO{sub 2} nanoparticles immobilized on glass using TiO{sub 2} sol–gel

Energy Technology Data Exchange (ETDEWEB)

Yeh, N. [Center of General Education, MingDao University, Taiwan (China); Lee, Y.C. [Graduate Institute of Materials Engineering, National Pingtung University of Science and Technology, Taiwan (China); Chang, C.Y. [Center of General Education, National Taitung Junior College, Taiwan (China); Cheng, T.C., E-mail: cheng.tachih@gmail.com [Department of Tropical Agriculture and International Cooperation, National Pingtung University of Science and Technology, Taiwan (China)

2013-12-31

This paper demonstrates a fish pathogen reduction procedure that uses TiO{sub 2} sol–gel coating Fe{sub 3}O{sub 4}@TiO{sub 2} powder on glass substrate. Such procedure can effectively relieve two constraints that haunt TiO{sub 2} sterilization applications: 1) the need for UV for overcoming the wide band gap of pure TiO{sub 2} and 2) the difficulty of its recovering from water for reuse. In the process, visible light responsive Fe{sub 3}O{sub 4}/TiO{sub 2} nanoparticles are synthesized and immobilized on glass using TiO{sub 2} sol–gel as the binder for fish bacterial pathogen disinfection test. After 3 h of visible light irradiation, the immobilized Fe{sub 3}O{sub 4}@TiO{sub 2}'s inhibition efficiencies for fish bacterial pathogen are, respectively, 50% for Edwardsiella tarda (BCRC 10670) and 23% for Aeromonas hydrophila (BCRC 13018)

Central hydroelectric of Santa Ana

International Nuclear Information System (INIS)

Pardo A, German

2000-01-01

The paper is related to the construction of an alternating tunnel of conduction to take advantage of the available hydraulic load among the Wiesner Plant and Santa Ana's tanks and of Suba, works required to build a hydroelectric power station with a generation capacity of approximately of 12 MW

Visible light photodegradation of phenanthrene catalyzed by Fe(III)-smectite: role of soil organic matter.

Science.gov (United States)

Jia, Hanzhong; Li, Li; Fan, Xiaoyun; Liu, Mingdeng; Deng, Wenye; Wang, Chuanyi

2013-07-15

In the present study, phenanthrene is employed as a model to explore the roles played by three soil organic matter (SOM) fractions, i.e., dissolved organic matter (DOM), humic acid (HA), and fulvic acid (FA), in its photodegradation with assistance of Fe(III)-smectite under visible-light. Slight decrease in phenanthrene photodegradation rate was observed in the presence of DOM, which is explained in terms of oxidative-radical competition between DOM and target phenanthrene molecules due to the high electron-donor capacity of phenolic moieties in DOM. On the other hand, a critic content is observed with FA (0.70mg/g) and HA (0.65mg/g). Before reaching the critic content, the removal of phenanthrene is accelerated; while after that, the photodegradation rate is suppressed. The acceleration of phenanthrene degradation can be attributed to the photosensitization of FA and HA. Due to the strong interaction between phenanthrene and the phenyl rings, however, the retention of phenanthrene on SOM-Fe(III)-smectite in the presence of high content of HA or FA is enhanced, thus slowing down its photodegradation. Those observations provide valuable insights into the transformation and fate of PAHs in the natural soil environment and open a window for using clay-humic substances complexes for remediation of contaminated soil. Copyright © 2013 Elsevier B.V. All rights reserved.

ESTRATEGIAS PARA EL ESTUDIO DE SITIOS DEL PERIODO COLONIAL EN EL NORDESTE ARGENTINO: FUERTE SANCTI SPIRITUS (1527-1529 Y SANTA FE LA VIEJA (1573-1660 / Strategies for the study of the colonial period sites in northeastern Argentina: Sancti Spiritus Fort

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Gabriel Cocco

2014-12-01

Full Text Available Normal 0 21 false false false ES-AR X-NONE X-NONE MicrosoftInternetExplorer4 coloniales de la región del Nordeste Argentino. Se toman dos casos de estudio, el fuerte Sancti Spiritus (1527-1529 y Santa Fe la Vieja (1573-1660; ubicados temporalmente en el inicio de la colonización española en Sudamérica y espacialmente sobre la llanura aluvial del Paraná. Los sitios representan dos etapas del colonialismo español y se vinculan a través de su historia, de la materialidad de sus construcciones y de los artefactos, de la[1] procedencia de quienes los ocuparon, del contexto cultural y natural donde fueron emplazados. Se hace una síntesis de la trayectoria seguida en la investigación de ambos asentamientos y se las compara con el fin de realizar algunas consideraciones acerca de las estrategias para el estudio de sitios históricos en esta región.   Palabras clave: asentamientos españoles del siglo XVI; cuenca del Paraná; trayectorias de investigación; métodos de excavación.   Abstract This paper deals with the strategies of archaeological research carried out in colonial sites in the region of the Northeastern Argentina. We considered two cases of study, the Sancti Spiritus Fort (1527-1529 and Santa Fe La Vieja (1573-1660; both enclaves are located temporarily in the beginning of the Spanish colonization in South America and spatially on the alluvial plain of the Paraná River. These sites represent two stages of Spanish colonialism and they are linked through its history, the materiality of their constructions, archaeological artifacts, and the origin of those who occupied these settlements; even we consider their cultural and natural contexts. This work is an overview of the trajectory followed in the study of both settlements and we compare them in order to take into account some considerations about the analytical and methodological strategies for the study of historical sites in this region.   Keywords: Spanish settlement of 16

Fabrication of magnetic Fe@ZnO{sub 0.6}S{sub 0.4} nanocomposite for visible-light-driven photocatalytic inactivation of Escherichia coli

Energy Technology Data Exchange (ETDEWEB)

Peng, Ziling [State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, Hubei (China); Wu, Dan [School of Life Sciences, The Chinese University of Hong Kong, Shatin, NT, Hong Kong Special Administrative Region (China); Wang, Wei, E-mail: weiwang@hust.edu.cn [State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, Hubei (China); Tan, Fatang [State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, Hubei (China); Ng, Tsz Wai [School of Life Sciences, The Chinese University of Hong Kong, Shatin, NT, Hong Kong Special Administrative Region (China); Chen, Jianguo; Qiao, Xueliang [State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, Hubei (China); Wong, Po Keung, E-mail: pkwong@cuhk.edu.hk [School of Life Sciences, The Chinese University of Hong Kong, Shatin, NT, Hong Kong Special Administrative Region (China)

2017-02-28

Highlights: • Fe@ZnO{sub 0.6}S{sub 0.4} was prepared by a facile two-step precipitation method. • Fe@ZnO{sub 0.6}S{sub 0.4} exhibited high photocatalytic activity under LED lamp irradiation. • Fe@ZnO{sub 0.6}S{sub 0.4} possessed good stability and reusability for bacterial inactivation. • Fe@ZnO{sub 0.6}S{sub 0.4} could be easily collected from the reaction solution by a magnet. • The release rate of metal ions from nanocomposite was kept at a very low level. - Abstract: Bacterial inactivation by magnetic photocatalysts has now received growing interests due to the easy separation for recycle and reuse of photocatalysts. In this study, magnetic Fe@ZnO{sub 0.6}S{sub 0.4} photocatalyst was prepared by a facile two-step precipitation method. Multiple techniques such as X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), UV–vis diffused reflectance spectra (UV-vis DRS) and vibrating sample magnetometer (VSM) were employed to characterize the structure, morphology and physicochemical properties of the photocatalyst. The as-obtained Fe@ZnO{sub 0.6}S{sub 0.4} possessing magnetic property was easily collected from the reaction system by a magnet. Under white light-emitting-diode (LED) lamp irradiation, Fe@ZnO{sub 0.6}S{sub 0.4} nanocomposite could completely inactivate 7-log of Escherichia coli K-12 within 5 h. More importantly, almost no decrease of photocatalytic efficiency in bacterial inactivation was observed even after five consecutive cycles, demonstrating Fe@ZnO{sub 0.6}S{sub 0.4} exhibited good stability for reuse. The low released rate of Fe{sup 2+}/Fe{sup 3+} and Zn{sup 2+} from Fe@ZnO{sub 0.6}S{sub 0.4} composite further indicated the photocatalyst showed low cytotoxicity to bacterium and high stability under LED lamp irradiation. Facile preparation, high photocatalytic efficiency, good stability and reusability, and magnetic recovery property endow Fe@ZnO{sub 0

57Fe Moessbauer spectroscopic studies on photosensitive nitrile hydratase (NHase)

International Nuclear Information System (INIS)

Kobayashi, Yoshio; Odaka, Masafumi

2001-01-01

57 Fe Moessbauer spectroscopy is a very useful technique for elucidating the chemical properties and biological changes of Fe species located at the reaction centers in various biological systems. We have applied 57 Fe Moessbauer spectroscopy to study the mechanism of photoactivation and the structural change caused by light irradiation of nitrile hydratase (NHase). (author)

Preparation, characterization and activity evaluation of p-n junction photocatalyst p-CaFe2O4/n-Ag3VO4 under visible light irradiation

International Nuclear Information System (INIS)

Chen Shifu; Zhao Wei; Liu Wei; Zhang Huaye; Yu Xiaoling; Chen Yinghao

2009-01-01

p-n junction photocatalyst p-CaFe 2 O 4 /n-Ag 3 VO 4 was prepared by ball milling Ag 3 VO 4 in H 2 O doped with p-type CaFe 2 O 4 . The structural and optical properties of the photocatalyst were characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and UV-vis diffuse reflection spectrum (DRS). The photocatalytic activity was evaluated by photocatalytic degradation of methylene blue (MB) under visible light irradiation. The results showed that the photocatalytic activity of the p-CaFe 2 O 4 /n-Ag 3 VO 4 was higher than that of Ag 3 VO 4 . When the amount of doped p-CaFe 2 O 4 was 2.0 wt.% and the p-CaFe 2 O 4 /n-Ag 3 VO 4 was ball milled for 12 h, the photocatalytic degradation efficiency was 85.4%. Effect of ball milling time on the photocatalytic activity of the photocatalyst was also investigated. The mechanisms of the increase in the photocatalytic activity were discussed by the p-n junction principle.

Prácticas de transgresión en la policía en un período de institución conflictiva. Santa Fe (Argentina, 1864-1881

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Paula María Sedran Caropresi

2014-07-01

Full Text Available El proceso de institucionalización de la policía santafesina, en Argentina, tuvo lugar en la segunda mitad del siglo XIX e implicó tensiones de distinta índole ya que ésta policía fue un factor clave en la resolución de los problemas comprendidos en la nueva agenda social. Este artículo analiza tres documentos administrativos de la policía que reportan casos de inconducta, amotinamiento y ebriedad protagonizados por agentes, cabos, sargentos y un primer oficial. Estas fuentes permiten indagar en los actos de la tropa y, por tanto, hacer visibles las tensiones entre sus prácticas y el comportamiento que las autoridades consideraban deseable. También, plantean preguntas importantes acerca de las motivaciones y representaciones que estas acciones implicaron. Nuestro marco teórico es la historia social, que pone de relieve a las relaciones sociales específicas y nos permite centrarnos en las luchas concretas de sentido. Utilizamos el concepto transgresión, que propone una mirada alternativa sobre qué acciones pueden considerarse contenciosas o contrarias al orden social, en función de su visibilidad y efectos disruptivos. Nuestro objetivo es contribuir al conocimiento de la institucionalización de un orden social moderno en Santa Fe, mediante el análisis de cómo la policía en formación afrontó transgresiones concretas hechas por integrantes de la tropa.

Novos compostos de coordenação heteronucleares de Fe"Ni" e Ga"Ni" como modelos para as fosfatases ácidas púrpuras substituídas

OpenAIRE

Batista, Suzana Cimara

2003-01-01

Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas. Programa de Pós-Graduação em Química. Novos compostos de coordenação heterobinucleares de FeIIINiII e GaIIINiII como modelos para as fosfatases ácidas púrpuras.

La Ex Hacienda de Santa Cruz

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Berta Pinto de Estrada

1975-06-01

Full Text Available Ex hacienda Santa Cruz was chosen to show the differences in the geographic and economic structure, and the historic causes that originated them, as an example of ihe situation in the northem part of Campeche.

Anatomical study of animal remains from Phoenician-Punic amphorae found in the Santa Giusta Pond, Sardinia (Italy

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Laura Portas

2015-12-01

Full Text Available During the underwater excavations carried out in the Santa Giusta Pond, near Oristano, Sardinia, a significant amount of Phoenician- Punic materials was brought to light including amphorae (dating back to 7th-2nd century BC and vegetal and animal remains. All of these archaeological finds may come from Othoca, an important Phoenician- Punic city on the eastern shore of the pond, geographically corresponding with the modern-day town of Santa Giusta. Animal materials consist of more than 3000 very well-preserved remains, belonging to sheep (Ovis aries, goat (Capra hircus and cattle (Bos taurus. Bone analyses allowed reconstructing the slaughtering methods, as well as manipulation procedures carried out to preserve meat in order to be exported overseas. Although pig (Sus scrofa played an important economical role in other Sardinian Phoenician-Punic settlements, in this archaeological context this species is absent, suggesting that the meat contained in the amphorae was probably destined to other areas of the Mediterranean basin, where people did not eat pork.

Oral health of the Paleoamericans of Lagoa Santa, Central Brazil.

Science.gov (United States)

Da-Gloria, Pedro; Larsen, Clark Spencer

2014-05-01

The peopling, origins, and early prehistory of the Americas are topics of intense debate. However, few studies have used human remains to document and interpret patterns of health and lifestyle of Paleoamericans. This study provides the first investigation to characterize oral health in a series of early Holocene skeletal remains from Lagoa Santa, Brazil, a locality containing the remains of some of the earliest inhabitants of South America (10,000-7,000 BP). The sample is composed of 949 teeth and 1925 alveoli from an estimated 113 individuals excavated from 17 archaeological sites located in the State of Minas Gerais. We compare dental caries and abscess prevalence at Lagoa Santa to a large sample of human skeletons from the Western Hemisphere Project (WHP) database using both individual and tooth/alveolus count methods. In addition, antemortem tooth loss and tooth wear were analyzed in Lagoa Santa by sex and age. The results show that Lagoa Santa dental caries and abscess prevalence are significantly higher than observed among other hunter-gatherers included in the WHP database, except when abscess prevalence is considered by individual count. Adult females have less tooth wear coupled with higher prevalence of dental caries and antemortem tooth loss than adult males. These results point to an unexpected record of poor oral health at Lagoa Santa, especially among females. A diet based on a highly cariogenic combination of wild tubers and fruits is suggested as an explanation for the elevated rate, characterizing an early adaptation to a tropical environment in South America. Copyright © 2014 Wiley Periodicals, Inc.

CoFeRh alloys

International Nuclear Information System (INIS)

Tabakovic, Ibro; Qiu Jiaoming; Riemer, Steve; Sun Ming; Vas'ko, Vlad; Kief, Mark

2008-01-01

The electrochemical behavior of Rh(III) species in CoFe solution containing RhCl 3 , NH 4 Cl, H 3 BO 3 , CoSO 4 , FeSO 4 , saccharin, and NaLS (Na lauryl sulfate) has been investigated. The electrochemistry of Rh(III) species is influenced by each of the compounds present in CoFe plating solution, but especially by addition of saccharin and H 3 BO 3 to the RhCl 3 -NH 4 Cl solution. The nucleation and growth of Rh on GC (glassy carbon), Ru, and Cu electrodes from NH 4 Cl solution was studied using the potentiostatic current-transient methods. The results support a predominantly progressive nucleation of Rh on all three-electrode surfaces. The nucleation kinetic parameters ANo (steady state nucleation rate) and Ns (saturation nuclear number density) were found to vary with potential and are electrode-dependent in order: GC > Ru∼Cu. The electrodeposited Rh films obtained from NH 4 Cl solution and nonmagnetic CoFeRh film obtained from CoFe solution were characterized in terms of the following properties: morphology, surface roughness, crystal structure and chemical composition. The origin of light elements found in Rh and CoFeRh films (O, Cl, S, C, N) was discussed

For Better or Worse: The Influence of FE Franchising on Learning.

Science.gov (United States)

Fletcher, Mick, Ed.

Seven papers look at lessons from the franchising experience in further education (FE) in Britain. "Franchising--A Case Study in FE Funding" (Mick Fletcher) looks at franchised provision in the light of universal themes that cut across all of FE: funding tariff, employer contributions, and local priorities. "The Case for…

Capacidad antioxidante de poblaciones silvestres de “tara” (Caesalpinia spinosa de las localidades de Picoy y Santa Fe (Provincia de Tarma, departamento de Junín

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Alberto López S.

2011-01-01

Full Text Available El Perú es el principal abastecedor de “tara”, gracias a que nuestro país posee una gran variedad de climas y tipos de suelos, haciendo posible la obtención de este cultivo durante la mayor parte del año. El departamento de Junín cuenta con poblaciones naturales de “tara” que aun no han sido caracterizadas bioquímica ni genéticamente, que podrían aprovecharse en beneficio de las comunidades locales. En este trabajo se reporta la capacidad antioxidante de “tara” provenientes de las localidades de Picoy y Santa Fe, ambas ubicadas en Tarma, Junín. Se utilizó la técnica del DPPH y del ABTS para valorar la capacidad antioxidante; para la determinación de fenoles y flavonoides se utilizó el reactivo de Folin-Ciocalteau según la técnica de Singleton. La muestra de Picoy reportó mayor cantidad de fenoles siendo de 563.70 mg/g de extracto seco, mientras que la cantidad de flavonoides fue de 0.664 mg/g. La capacidad antioxidante mostro una mejor respuesta en la muestra de Picoy, reportándose mediante el DPPH un IC50 1.244 mg/ml y con el ABTS un 35.3% de inhibición. Estos datos podrían aprovecharse para incrementar el valor agregado y mejorar la oferta de este recurso en dicha localidad debido a sus mejores características antioxidantes.

Caracterização do processo de rigor mortis em músculos de cordeiros da raça Santa Inês e F1 Santa Inês x Dorper Characterization of rigor mortis process of muscles lamb of Santa Inês breed and F1 Santa Inês x Dorper

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Rafael dos Santos Costa

2011-01-01

Full Text Available O desenvolvimento do processo de rigor mortis nas carcaças dos animais de açougue influenciam diretamente a qualidade da carne. As características do processo de rigor mortis em carcaça de ovinos durante o processamento industrial para obtenção de carcaças resfriadas já foram estudadas em outros países e no Brasil em ovinos Santa Inês, mas ainda não estabelecidas em ovinos F1 Santa Inês x Dorper. Assim, objetivou-se neste trabalho caracterizar o processo de rigor mortis dos músculos Semitendinosus e Triceps brachii durante o resfriamento industrial e maciez da carne, em 10 carcaças ovinas. Foram escolhidos aleatoriamente 10 ovinos machos inteiros, sendo seis da raça Santa Inês e quatro F1 Santa Inês x Dorper, abatidos no Matadouro Frigorífico de Campos - Campos dos Goytacazes, Rio de Janeiro. Após a sangria, analisou-se temperatura, pH, comprimento de sarcômero em diferentes intervalos de tempo (4h; 6h; 8h; 10h; 12h; e 24h e força de cisalhamento ou maciez às 48h, do músculo Semitendinosus. Paralelamente, foi realizada a correlação entre a análise sensorial e a análise instrumental desse músculo. A temperatura da câmara fria variou de 12,2°C (4h a -0,5°C (24h e a temperatura média das carcaças foi de 26,80°C e -0,20°C, respectivamente. O pH médio inicial do músculo Semitendinosus foi de 6,62 e o final 5,64 enquanto no músculo T. brachii foi de 6,50 (4h e 5,68 (24h. A contração máxima do sarcômero do músculo Semitendinosus ocorreu na 12ªh(1,50mm após a sangria e no músculo Triceps brachii, no intervalo entre a 10ªh e 24ªh (1,53 a 1,57mm. No músculo Semitendinosus a força de cisalhamento ou maciez foi semelhante entre cordeiros da raça Santa Inês e F1 Santa Inês x Dorper, demonstrando que o grupo genético não influencia na maciez da carne. O painel sensorial confirmou os resultados obtidos na análise instrumental. Na correlação da análise instrumental (força de cisalhamento com a an

Magnetic Properties and Microstructure of FeOx/Fe/FePt and FeOx/FePt Films

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Jai-Lin Tsai

2013-01-01

Full Text Available The Fe(6 nm/FePt film with perpendicular magnetization was deposited on the glass substrate. To study the oxygen diffusion effect on the coupling of Fe/FePt bilayer, the plasma oxidation with 0.5~7% oxygen flow ratio was performed during sputtered part of Fe layer and formed the FeOx(3 nm/Fe(3 nm/FePt trilayer. Two-step magnetic hysteresis loops were found in trilayer with oxygen flow ratio above 1%. The magnetization in FeOx and Fe/FePt layers was decoupled. The moments in FeOx layer were first reversed and followed by coupled Fe/FePt bilayer. The trilayer was annealed again at 500°C and 800°C for 3 minutes. When the FeOx(3 nm/Fe(3 nm/FePt trilayer was annealed at 500°C, the layers structure was changed to FeOx(6 nm/FePt bilayer due to oxygen diffusion. The hard-magnetic FeOx(6 nm/FePt film was coupled with single switching field. The FeOx/(disordered FePt layer structure was observed with further annealing at 800°C and presented soft-magnetic loop. In summary, the coupling between soft-magnetic Fe, FeOx layer, and hard-magnetic L10 FePt layer can be controlled by the oxygen diffusion behavior, and the oxidation of Fe layer was tuned by the annealing temperature. The ordered L10 FePt layer was deteriorated by oxygen and became disordered FePt when the annealed temperature was up to 800°C.

Anofelinos de Santa Catarina (Diptera: Culicidae, Brasil Anophelines of Santa Catarina (Diptera: Culicidae, Brazil

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Maria da Graça Teixeira Portes

2010-04-01

Full Text Available INTRODUÇÃO: No Brasil, a Região Amazônica é endêmica em malária. Em Santa Catarina, a malária foi eliminada na década de 80. A partir daí, ocorreram poucos casos autóctones isolados, e esporádicos. No entanto, em função da existência do vetor em seu território, da existência de extensa área endêmica no Brasil e da grande mobilidade de pessoas em áreas turísticas no estado, existe a probabilidade de reintrodução da doença. MÉTODOS: Utilizou-se os seguintes dados: Banco de Dados do Núcleo de Entomologia da Fundação Nacional de Saúde, Santa Catarina (ACCES,1997-2000; Sistema de Informação de Vigilância Epidemiológica, Secretaria de Vigilância em Saúde (Malária/SC e Sistema de Informação de Notificação e Agravo(SINAN/SC. Os mesmos foram transportados e analisados, no programa Microsoft Office Excel 2007. RESULTADOS: As coletas foram realizadas em 48 municípios, 159 localidades, sendo identificados 12.310 Culicídeos, 11.546 (93,7% Anopheles e 764 (6,2% como outros. Foram identificados três subgêneros e 13 espécies de anofelinos. CONCLUSÕES: Considerando que nos municípios pesquisados, foi identificada a presença de importantes vetores como Anopheles cruzii e Anopheles albitasis e há circulação de pessoas infectadas provenientes de áreas endêmicas, pode-se considerar que os mesmos são áreas receptivas e vulneráveis à malária. Essas espécies são suspeitas de serem responsáveis pela transmissão de malária na região, principalmente nos municípios de Gaspar, Indaial e Rodeio.INTRODUCTION: The Amazon region of Brazil is endemic for malaria. In the State of Santa Catarina, malaria was eliminated in the 1980s. Since then, a few sporadic isolated autochthonous cases have occurred. However, because malaria vectors are present within Brazilian territory and extensive endemic areas exist in this country, along with the great mobility of people in tourist areas of Santa Catarina, there is the

Impact of Overlapping Fe/TiO2 Prepared by Sol-Gel and Dip-Coating Process on CO2 Reduction

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Akira Nishimura

2016-01-01

Full Text Available Fe-doped TiO2 (Fe/TiO2 film photocatalyst was prepared by sol-gel and dip-coating process to extend its photoresponsivity to the visible spectrum. To promote the CO2 reduction performance with the photocatalyst, some types of base materials used for coating Fe/TiO2, which were netlike glass fiber and Cu disc, were investigated. The characterization of prepared Fe/TiO2 film coated on netlike glass fiber and Cu disc was analyzed by SEM and EPMA. In addition, the CO2 reduction performance of Fe/TiO2 film coated on netlike glass disc, Cu disc, and their overlap was tested under a Xe lamp with or without ultraviolet (UV light, respectively. The results show that the concentration of produced CO increases by Fe doping irrespective of base material used under the illumination condition with UV light as well as that without UV light. Since the electron transfer between two overlapped photocatalysts is promoted, the peak concentration of CO for the Fe/TiO2 double overlapping is approximately 1.5 times as large as the Fe/TiO2 single overlapping under the illumination condition with UV light, while the promotion ratio is approximately 1.1 times under that without UV light.

Ground-water quality in the Santa Rita, Buellton, and Los Olivos hydrologic subareas of the Santa Ynez River basin, Santa Barbara County, California

Science.gov (United States)

Hamlin, S.N.

1985-01-01

Groundwater quality in the upper Santa Ynez River Valley in Santa Barbara County has degraded due to both natural and anthropogenic causes. The semiarid climate and uneven distribution of rainfall has limited freshwater recharge and caused salt buildup in water supplies. Tertiary rocks supply mineralized water. Agricultural activities (irrigation return flow containing fertilizers and pesticides, cultivation, feedlot waste disposal) are a primary cause of water quality degradation. Urban development, which also causes water quality degradation (introduced contaminants, wastewater disposal, septic system discharge, and land fill disposal of waste), has imposed stricter requirements on water supply quality. A well network was designed to monitor changes in groundwater quality related to anthropogenic activities. Information from this network may aid in efficient management of the groundwater basins as public water supplies, centered around three basic goals. First is to increase freshwater recharge to the basins by conjunctive surface/groundwater use and surface-spreading techniques. Second is to optimize groundwater discharge by efficient timing and spacing of pumping. Third is to control and reduce sources of groundwater contamination by regulating wastewater quality and distribution and, preferably, by exporting wastewaters from the basin. (USGS)

Environmental embrittlement of intermetallic compounds in Fe-Al alloys

Institute of Scientific and Technical Information of China (English)

张建民; 张瑞林; S.H.YU; 余瑞璜

1996-01-01

First,it is proposed that hydrogen atoms occupy the interstitial sites in Fe3Al and FeAl.Then the environmental embrittlement of intermetallic compounds in Fe-Al alloys is studied in the light of calculated valence electron structures and bond energy of Fe3Al and FeAl containing hydrogen atoms.From the analyses it is found that the states of metal atoms will change,in which more lattice electrons will become covalent electrons to bond with hydrogen atoms when the atomic hydrogen diffuses into the intermetallic compounds in Fe-Al alloys,which will result in the decrease of local metallicity in Fe3Al and FeAl.Meanwhile,it is found that the crystal will easily cleave since solute hydrogen bonds with metal atoms and severely anisotropic bonds form.As a conclusion,these factors result in the environmental embrittlement of Fe3Al and FeAl.

DETERMINACIÓN DEL ESTADO NUTRICIONAL EN PACIENTES CON ENFERMEDAD PULMONAR OBSTRUCTIVA CRÓNICA DEL PROGRAMA DE REHABILITACIÓN PULMONAR DEL HOSPITAL UNIVERSITARIO FUNDACIÓN SANTA FE DE BOGOTÁ DURANTE LOS AÑOS 2014-2015

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Estefanía Zuluaga

2017-11-01

Full Text Available Introducción: La Organización Mundial de la Salud (OMS estima que 65 millones de personas sufren de Enfermedad Pulmonar Obstructiva Crónica (EPOC moderada o severa siendo una enfermedad crónica cuyos fenotipos se encuentran relacionados con el estado nutricional y generan efectos metabólicos, y también sistémica multiorgánica progresiva, presenciando cambios estructurales y funcionales adversos en tejidos coronarios y musculo-esqueléticos. En 1968 Filley describió dos fenotipos en la enfermedad pulmonar avanzada: el llamado soplador azul, hoy denominado bronquítico y el soplador rosado, conocido como enfisematoso. El enfisematoso es un paciente desnutrido tendiendo hacia la caquexia; mientras que el bronquítico en su mayoría se encuentra en sobrepeso u obesidad, y presenta comorbilidades metabólicas. Objetivo: determinar el estado nutricional en pacientes con EPOC mediante la antropometría y el fenotipo para establecer una terapia multimodal caracterizada por tratamiento médico, nutricional y un plan de ejercicio que mejore las condiciones generales del paciente. Metodología: Se realizó un estudio observacional transversal, con recolección de la información de manera retrospectiva, analizando los registros clínicos de los pacientes del programa de Rehabilitación Pulmonar en el Hospital Universitario de la Fundación Santa Fe de Bogotá con EPOC en los años 2014 a 2015, con edad mayor de 18 años, el total de pacientes es de 37, 62% (n=23 mujeres; 38% (n= 14 hombres. Resultados: Hubo una mayor prevalencia de EPOC en mujeres no fumadoras y exfumadoras. Los pacientes, independientes del género, se encontraban en un 43,24% (n=16 en sobrepeso u obesidad, con un WHtR mayor o igual a 0.6, implicando el aumento en el riesgo cardiovascular, diabetes y síndrome metabólico. Los pacientes que presentaron bajo peso fueron un 10,81%(n=4, diferente a lo reportado en la literatura. Conclusión: Es necesario realizar estudios con

Epitaxial growth of semiconducting β-FeSi2 and its application to light-emitting diodes

International Nuclear Information System (INIS)

Suemasu, T.; Takakura, K.; Li, Cheng; Ozawa, Y.; Kumagai, Y.; Hasegawa, F.

2004-01-01

In this paper, we review the detailed study of epitaxial growth of β-FeSi 2 films by reactive deposition epitaxy (RDE), multilayer technique and molecular beam epitaxy (MBE). The p- and n-type β-FeSi 2 was formed when it was grown under an Fe-rich and an Si-rich condition, respectively. The maximum electron and hole mobilities of the β-FeSi 2 epitaxial films reached 6900 and 13000 cm 2 /V·s for the n- and p-type β-FeSi 2 , respectively, at around 50 K. Room temperature (RT) 1.6 μm electroluminescence (EL) was realized by optimizing the growth conditions for p-Si/β-FeSi 2 particles/n-Si structures prepared by RDE for β-FeSi 2 and by MBE for Si

Breeding and trade of wildlife in Santa Catarina state, Brazil

Directory of Open Access Journals (Sweden)

VV Kuhnen

Full Text Available The wildlife trade is becoming increasingly more relevant in discussions concerning conservation biology and the sustainable management of natural resources. The aim of this study was to document the trade and breeding of wildlife in Santa Catarina state, in southern Brazil. Data was collected from annual reports (1996-2008 of wildlife breeders which were sent to IBAMA. By the end of 2008, there were 79 wildlife breeders and 11 wildlife traders distributed in Santa Catarina. Commercial breeding accounted for the highest number of breeders (51%. In total, there are 213 species of wild animals bred in the state: 177 birds, 19 mammals and 17 reptiles. Of these, 48% are native to Santa Catarina, 32% occur in other Brazilian states and 20% are exotic to Brazil. Nine percent of the species bred are vulnerable or endangered. It was observed that some breeders reported breeding unauthorized species. Altogether, 93 species are bred illegally by 19 breeders. Of these species, 48 are native to Santa Catarina and three are classified as vulnerable or in danger of extinction. We hope the data presented in this paper contributes to the development of conservation strategies and conscious use of wildlife resources in Brazil.

[Santa Claus is perceived as reliable and friendly: results of the Danish Christmas 2013 survey].

Science.gov (United States)

Amin, Faisal Mohammad; West, Anders Sode; Jørgensen, Carina Sleiborg; Simonsen, Sofie Amalie; Lindberg, Ulrich; Tranum-Jensen, Jørgen; Hougaard, Anders

2013-12-02

Several studies have indicated that the population in general perceives doctors as reliable. In the present study perceptions of reliability and kindness attributed to another socially significant archetype, Santa Claus, have been comparatively examined in relation to the doctor. In all, 52 randomly chosen participants were shown a film, where a narrator dressed either as Santa Claus or as a doctor tells an identical story. Structured interviews were then used to assess the subjects' perceptions of reliability and kindness in relation to the narrator's appearance. We found a strong inclination for Santa Claus being perceived as friendlier than the doctor (p = 0.053). However, there was no significant difference in the perception of reliability between Santa Claus and the doctor (p = 0.524). The positive associations attributed to Santa Claus probably cause that he is perceived friendlier than the doctor who may be associated with more serious and unpleasant memories of illness and suffering. Surprisingly, and despite him being an imaginary person, Santa Claus was assessed as being as reliable as the doctor.

Environmental application of millimetre-scale sponge iron (s-Fe{sup 0}) particles (IV): New insights into visible light photo-Fenton-like process with optimum dosage of H{sub 2}O{sub 2} and RhB photosensitizers

Energy Technology Data Exchange (ETDEWEB)

Ju, Yongming, E-mail: juyongming@scies.org [South China Institute of Environmental Sciences, Ministry of Environmental Protection (MEP), Guangzhou 510655 (China); Innovative Laboratory for Environmental Functional Materials and Environmental Applications of Microwave Irradiation, South China Subcenter of State Environmental Dioxin Monitoring Center, Guangzhou 510655 (China); Guangdong Key Laboratory of Agro-Environment Integrated Control, South China Institute of Environmental Sciences, Guangzhou 510655 (China); Yu, Yunjiang, E-mail: yuyunjiang@scies.org [South China Institute of Environmental Sciences, Ministry of Environmental Protection (MEP), Guangzhou 510655 (China); Wang, Xiaoyan; Xiang, Mingdeng; Li, Liangzhong [South China Institute of Environmental Sciences, Ministry of Environmental Protection (MEP), Guangzhou 510655 (China); Deng, Dongyang [South China Institute of Environmental Sciences, Ministry of Environmental Protection (MEP), Guangzhou 510655 (China); Innovative Laboratory for Environmental Functional Materials and Environmental Applications of Microwave Irradiation, South China Subcenter of State Environmental Dioxin Monitoring Center, Guangzhou 510655 (China); Guangdong Key Laboratory of Agro-Environment Integrated Control, South China Institute of Environmental Sciences, Guangzhou 510655 (China); Dionysiou, Dionysios D., E-mail: dionysios.d.dionysiou@uc.edu [Environmental Engineering and Science Program, Department of Biomedical, Chemical and Environmental Engineering (DBCEE), University of Cincinnati, Cincinnati, Ohio, 45221-0012 (United States)

2017-02-05

Highlights: • Synergistic action of Rhodamine B (RhB), visible light, H{sub 2}O{sub 2} and s-Fe{sup 0} is essential. • The complexes of RhB and Fe{sup 3+} eject one electron via ligand-to-metal charge-transfer. • RhB assists the photo-Fenton-like removal of tetrabromobisphenol A (TBBPA). - Abstract: In this study, we firstly develop the photo-Fenton-like system with millimetric sponge iron (s-Fe{sup 0}), H{sub 2}O{sub 2}, visible light (vis, λ ≥ 420 nm) and rhodamine B (RhB), and present a comprehensive study concerning the mechanism. Thus, we investigate (1) the adsorption of RhB onto s-Fe{sup 0}, (2) the photo-Fenton-like removal of RhB over iron oxides generated from the corrosion of s-Fe{sup 0}, (3) the homogeneous photo-Fenton removal of RhB over Fe{sup 2+} or Fe{sup 3+}, (4) the Fe{sup 3+}-RhB complexes, and (5) the photo-Fenton-like removal of tetrabromobisphenol A (TBBPA). The results show that neither the adsorption process over s-Fe{sup 0} nor the photo-Fenton-like process over FeOOH, Fe{sub 3}O{sub 4} and Fe{sub 2}O{sub 3}, achieved efficient removal of RhB. For comparison, in homogeneous photo-Fenton process, the presence of Fe{sup 3+} ions, rather than Fe{sup 2+} ions, effectively eliminated RhB. Furthermore, the UV–vis spectra showing new absorbance at ∼ 285 nm indicate the complexes of RhB and Fe{sup 3+} ions, adopting vis photons to form excited state and further eject one electron via ligand-to-metal charge-transfer to activate H{sub 2}O{sub 2}. Additionally, efficient TBBPA removal was obtained only in the presence of RhB. Accordingly, the s-Fe{sup 0}– based photo-Fenton-like process assisted with dyestuff wastewater is promising for removing a series of persistent organic pollutants.

Modelling the self-organization and collapse of complex networks

Indian Academy of Sciences (India)

Modelling the self-organization and collapse of complex networks. Sanjay Jain Department of Physics and Astrophysics, University of Delhi Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore Santa Fe Institute, Santa Fe, New Mexico.

Ecotourism: The Santa Elena Rainforest Project.

Science.gov (United States)

Wearing, Stephen

1993-01-01

Describes an ecotourism project in which the community of Santa Elena, Costa Rica, are developing a rainforest reserve on government land leased permanently to the local high school. Discusses the impact of the project on the community's economy and environment. (Contains 30 references.) (MDH)

Men and women in the rural world of the south of Santa Fe. Inequality and social dynamics in farming communities at the beginning of the XXI century Mujeres y hombres en el mundo agrario del sur santafecino. Desigualdades y dinámicas sociales en comunidades agrícolas a comienzos del siglo XXI

Directory of Open Access Journals (Sweden)

José Muzlera

2010-01-01

Full Text Available The development of capitalism in farming has led to several transformations and papers which reflect on this social event. In the framework of a new rural life associated to a changing and highly- tech agriculture, this study is built on the basis of the analysis of the relationships which are established between men and women in three towns of the south of the province of Santa Fe, the core of the Pampa region. To achieve this aim, we have chosen three dimensions: the level of formal education, the areas of sociability, the household economy, the access to land and the inheritance practices. A new statistical sample of 1082 cases, together with observations, unstructured interviews and ethnographic records, have been the main input for a quality-quantity approach of the issues in question.El desarrollo del capitalismo en el agro ha dado lugar a numerosas transformaciones y a diversos trabajos que reflexionan en torno a este suceso social. En el marco de una nueva ruralidad asociada a una agricultura en transformación y altamente tecnologizada, el presente estudio se construye en base a un análisis acerca de las relaciones que se establecen entre hombres y mujeres en tres comunas del sur de la Provincia de Santa Fe, zona núcleo de la Región Pampeana. Para llevar adelante dicho objetivo hemos escogido, como dimensiones de aproximación principales del análisis: los niveles de educación formal, los espacios de sociabilidad, la economía del hogar, el acceso a la tierra y las prácticas sucesorias. Una muestra estadísticamente representativa de 1.082 casos, junto a observaciones, entrevistas desestructuradas y registros etnográficos, han sido los insumos principales para un abordaje cuali-cuantitativo de los asuntos en cuestión.

GLOBULAR CLUSTER ABUNDANCES FROM HIGH-RESOLUTION, INTEGRATED-LIGHT SPECTROSCOPY. III. THE LARGE MAGELLANIC CLOUD: Fe AND AGES

International Nuclear Information System (INIS)

Colucci, Janet E.; Bernstein, Rebecca A.; Cameron, Scott A.; McWilliam, Andrew

2011-01-01

In this paper, we refine our method for the abundance analysis of high-resolution spectroscopy of the integrated light of unresolved globular clusters (GCs). This method was previously demonstrated for the analysis of old (>10 Gyr) Milky Way (MW) GCs. Here, we extend the technique to young clusters using a training set of nine GCs in the Large Magellanic Cloud. Depending on the signal-to-noise ratio of the data, we use 20-100 Fe lines per cluster to successfully constrain the ages of old clusters to within a ∼5 Gyr range, the ages of ∼2 Gyr clusters to a 1-2 Gyr range, and the ages of the youngest clusters (0.05-1 Gyr) to a ∼200 Myr range. We also demonstrate that we can measure [Fe/H] in clusters with any age less than 12 Gyr with similar or only slightly larger uncertainties (0.1-0.25 dex) than those obtained for old MW GCs (0.1 dex); the slightly larger uncertainties are due to the rapid evolution in stellar populations at these ages. In this paper, we present only Fe abundances and ages. In the next paper in this series, we present our complete analysis of ∼20 elements for which we are able to measure abundances. For several of the clusters in this sample, there are no high-resolution abundances in the literature from individual member stars; our results are the first detailed chemical abundances available. The spectra used in this paper were obtained at Las Campanas with the echelle on the du Pont Telescope and with the MIKE spectrograph on the Magellan Clay Telescope.

Muusikamaailm / Priit Kuusk

Index Scriptorium Estoniae

Kuusk, Priit, 1938-

2007-01-01

Lühidalt uvistest tippfestivalidest Ameerikas ja Euroopas (Aspeni muusikafestival, Central City Opera suvefestival, Santa Fe kammerfestival, Santa Fe ooperifestival, Vail Valley festival "Bravo", Salzburgi festival, Bayreuthi Wagneri Festival, Verona ooperifestival, Prantsuse Raadio Festival, Ljubljana festival)

Recent recoveries of archaeological ceramics on Santa Isabel, central Solomon Islands

International Nuclear Information System (INIS)

Carter, M.J.; Roe, D.; Keopo, J.

2012-01-01

Recent field investigations on Santa Isabel in the Central Solomon Islands have revealed the presence of archaeological pottery in both terrestrial and intertidal contexts. Preliminary dating results and comparative stylistic analyses of sherds provide evidence to suggest an antiquity of ceramics in northwest Isabel spanning the late Holocene to the recent historic past. These research outcomes expand the known distribution of pottery within the Solomon Islands and provide new knowledge about the prehistory of Santa Isabel. Here we describe the Santa Isabel ceramics, and suggest several implications of the research for current settlement models of the Solomon Islands and for our understanding of the variability in the archaeological record of mid- to late-Holocene ceramic distribution throughout the region. (author). 24 refs., 7 figs.

Stability of the high pressure phase Fe3S2 up to Earth's core pressures in the Fe-S-O and the Fe-S-Si systems

Science.gov (United States)

Zurkowski, C. C.; Chidester, B.; Davis, A.; Brauser, N.; Greenberg, E.; Prakapenka, V. B.; Campbell, A.

2017-12-01

Earth's core is comprised of an iron-nickel alloy that contains 5-15% of a light element component. The abundance and alloying capability of sulfur, silicon and oxygen in the bulk Earth make them important core alloy candidates; therefore, the high-pressure phase equilibria of the Fe-S-O and Fe-S-Si systems are relevant for understanding the possible chemistry of Earth's core. Previously, a Fe3S2 phase was recognized as a low-pressure intermediate phase in the Fe-FeS system that is stable from 14-21 GPa, but the structure of this phase has not been resolved. We report in-situ XRD and chemical analysis of recovered samples to further examine the stability and structure of Fe3S2 as it coexists with other phases in the Fe-S-O and Fe-S-Si systems. In situ high P-T synchrotron XRD experiments were conducted in the laser-heated diamond anvil cell to determine the equilibrium phases in Fe75S7O18 and Fe80S5Si15 compositions between 30 and 174 GPa and up to 3000 K. In the S,O-rich samples, an orthorhombic Fe3S2 phase coexists with hcp-Fe, Fe3S and FeO and undergoes two monoclinic distortions between 60 and 174 GPa. In the S,Si-rich samples, the orthorhombic Fe3S2 phase was observed up to 115 GPa. With increasing pressure, the Fe3S2 phase becomes stable to higher temperatures in both compositions, suggesting possible Fe3(S,O)2 or Fe3(S,Si)2 solid solutions. SEM analysis of a laser heated Fe75S7O18 sample recovered from 40 GPa and 1450 K confirms a Fe3(S,O)2 phase with O dissolved into the structure. Based on the current melting data in the Fe-S-O and Fe-S-Si systems, the Fe3(S,O)2 stability field intersects the solidus in the outer core and could be a possible liquidus phase in Fe,S,O-rich planetary cores, whereas Fe3S is the stable sulfide at outer core pressures in Fe,S,Si-rich systems.

CoFeRh alloys

Energy Technology Data Exchange (ETDEWEB)

Tabakovic, Ibro [Seagate Technology, Research and Development, Bloomington, MN 55435 (United States)], E-mail: ibro.m.tabakovic@seagate.com; Qiu Jiaoming; Riemer, Steve; Sun Ming; Vas' ko, Vlad; Kief, Mark [Seagate Technology, Research and Development, Bloomington, MN 55435 (United States)

2008-01-01

The electrochemical behavior of Rh(III) species in CoFe solution containing RhCl{sub 3}, NH{sub 4}Cl, H{sub 3}BO{sub 3}, CoSO{sub 4}, FeSO{sub 4}, saccharin, and NaLS (Na lauryl sulfate) has been investigated. The electrochemistry of Rh(III) species is influenced by each of the compounds present in CoFe plating solution, but especially by addition of saccharin and H{sub 3}BO{sub 3} to the RhCl{sub 3}-NH{sub 4}Cl solution. The nucleation and growth of Rh on GC (glassy carbon), Ru, and Cu electrodes from NH{sub 4}Cl solution was studied using the potentiostatic current-transient methods. The results support a predominantly progressive nucleation of Rh on all three-electrode surfaces. The nucleation kinetic parameters ANo (steady state nucleation rate) and Ns (saturation nuclear number density) were found to vary with potential and are electrode-dependent in order: GC > Ru{approx}Cu. The electrodeposited Rh films obtained from NH{sub 4}Cl solution and nonmagnetic CoFeRh film obtained from CoFe solution were characterized in terms of the following properties: morphology, surface roughness, crystal structure and chemical composition. The origin of light elements found in Rh and CoFeRh films (O, Cl, S, C, N) was discussed.

Hydrologic and geochemical characterization of the Santa Rosa Plain watershed, Sonoma County, California

Science.gov (United States)

Nishikawa, Tracy

2013-01-01

The Santa Rosa Plain is home to approximately half of the population of Sonoma County, California, and faces growth in population and demand for water. Water managers are confronted with the challenge of meeting the increasing water demand with a combination of water sources, including local groundwater, whose future availability could be uncertain. To meet this challenge, water managers are seeking to acquire the knowledge and tools needed to understand the likely effects of future groundwater development in the Santa Rosa Plain and to identify efficient strategies for surface- and groundwater management that will ensure the long-term viability of the water supply. The U.S. Geological Survey, in cooperation with the Sonoma County Water Agency and other stakeholders in the area (cities of Cotati, Rohnert Park, Santa Rosa, and Sebastopol, town of Windsor, Cal-American Water Company, and the County of Sonoma), undertook this study to characterize the hydrology of the Santa Rosa Plain and to develop tools to better understand and manage the groundwater system. The objectives of the study are: (1) to develop an updated assessment of the hydrogeology and geochemistry of the Santa Rosa Plain; (2) to develop a fully coupled surface-water and groundwater-flow model for the Santa Rosa Plain watershed; and (3) to evaluate the potential hydrologic effects of alternative groundwater-management strategies for the basin. The purpose of this report is to describe the surface-water and groundwater hydrology, hydrogeology, and water-quality characteristics of the Santa Rosa Plain watershed and to develop a conceptual model of the hydrologic system in support of the first objective. The results from completing the second and third objectives will be described in a separate report.

Santa Lucia River basin. Development of water resources; Cuenca del Rio Santa Lucia.Desarrollo de los recursos hidricos

Energy Technology Data Exchange (ETDEWEB)

NONE

1970-07-01

The main objective of this study was to orient the development of water resources of the Santa Lucia River basin to maximum benefit in accordance with the priorities established by Government in relation to the National Development Plans

Ternary magnetic g-C{sub 3}N{sub 4}/Fe{sub 3}O{sub 4}/AgI nanocomposites: Novel recyclable photocatalysts with enhanced activity in degradation of different pollutants under visible light

Energy Technology Data Exchange (ETDEWEB)

Akhundi, Anise; Habibi-Yangjeh, Aziz, E-mail: ahabibi@uma.ac.ir

2016-05-01

In the present work, we illustrate the preparation of graphitic carbon nitride/magnetite/silver iodide (g-C{sub 3}N{sub 4}/Fe{sub 3}O{sub 4}/AgI) nanocomposites, as novel magnetically recyclable visible-light-driven photocatalysts. The nanocomposites were prepared by reflux method at 96 °C with no require to any additives or post preparation treatments. The resultant samples were characterized using XRD, EDX, SEM, TEM, FT-IR, UV–vis DRS, PL, TGA, and VSM techniques. Among the nanocomposites, the sample with 20 percent of AgI displayed superior activity. This nanocomposite exhibited superparamagnetic property with a saturation magnetization of 16.9 emu/g. Photocatalytic activity of the g-C{sub 3}N{sub 4}/Fe{sub 3}O{sub 4}/AgI (20%) nanocomposite was about 8.7 and 6.9 fold higher than those of the g-C{sub 3}N{sub 4} and g-C{sub 3}N{sub 4}/Fe{sub 3}O{sub 4} samples, respectively for degradation of rhodamine B (RhB) under visible-light irradiation. Moreover, we investigated the influence of refluxing time, calcination temperature, and scavengers of the reactive species on the degradation activity. It was demonstrated that the ternary magnetic photocatalyst has considerable activity in degradation of two more dye pollutants. Besides, it was demonstrated that the ternary magnetic nanocomposite has reasonable stability during five recycling experiments. - Highlights: • Novel ternary g-C{sub 3}N{sub 4}/Fe{sub 3}O{sub 4}/AgI nanocomposites were prepared using a facile method. • g-C{sub 3}N{sub 4}/Fe{sub 3}O{sub 4}/AgI (20%) has the best activity in degradation of RhB under visible-light. • The activity is 8.7 and 6.9E-fold higher than g-C{sub 3}N{sub 4} and g-C{sub 3}N{sub 4}/Fe{sub 3}O{sub 4}, respectively. • The nanocomposite showed enhance activity in degradation of two more pollutants.

Ternary g-C{sub 3}N{sub 4}/Fe{sub 3}O{sub 4}/Ag{sub 3}VO{sub 4} nanocomposites: Novel magnetically separable visible-light-driven photocatalysts for efficiently degradation of dye pollutants

Energy Technology Data Exchange (ETDEWEB)

Mousavi, Mitra; Habibi-Yangjeh, Aziz, E-mail: ahabibi@uma.ac.ir

2015-08-01

In this work, novel magnetically separable g-C{sub 3}N{sub 4}/Fe{sub 3}O{sub 4}/Ag{sub 3}VO{sub 4} nanocomposites were successfully prepared by anchoring Fe{sub 3}O{sub 4} and Ag{sub 3}VO{sub 4} on surface of the g-C{sub 3}N{sub 4} sheets. The prepared samples were fairly characterized using X-ray diffraction, energy dispersive analysis of X-rays, scanning electron microscopy, transmission electron microscopy, UV–vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, thermogravimetric analysis, and vibrating sample magnetometry techniques. Compared with the g-C{sub 3}N{sub 4} and g-C{sub 3}N{sub 4}/Fe{sub 3}O{sub 4} samples, the g-C{sub 3}N{sub 4}/Fe{sub 3}O{sub 4}/Ag{sub 3}VO{sub 4} nanocomposites displayed higher photocatalytic activity for degradation of rhodamine B under visible-light irradiation. Photocatalytic activity of the nanocomposite with 60% of Ag{sub 3}VO{sub 4} was about 14, 8, and 3-fold higher than those of the g-C{sub 3}N{sub 4}, g-C{sub 3}N{sub 4}/Fe{sub 3}O{sub 4}, and Ag{sub 3}VO{sub 4} samples, respectively. Furthermore, influence of refluxing time, calcination temperature, and scavengers of the reactive species on the degradation activity was investigated in detail and the results were discussed. The enhanced photocatalytic activity of the nanocomposites was attributed to efficiently separation of the charge carriers and their increased visible-light harvesting ability. - Graphical abstract: Display Omitted - Highlights: • g-C{sub 3}N{sub 4}/Fe{sub 3}O{sub 4}/Ag{sub 3}VO{sub 4} was prepared as ternary novel visible-light-driven photocatalyst. • Among the prepared samples, g-C{sub 3}N{sub 4}/Fe{sub 3}O{sub 4}/Ag{sub 3}VO{sub 4} (60%) has the best activity. • The activity was related to efficiently generation and separation of charge carriers. • The photocatalyst was magnetically separated from the treated solution.

Effect of Drying Conditions on the Catalytic Performance, Structure, and Reaction Rates over the Fe-Co-Mn/MgO Catalyst for Production of Light Olefins

Directory of Open Access Journals (Sweden)

Majid Abdouss

2018-01-01

How to Cite: Abdouss, M., Arsalanfar, M., Mirzaei, N., Zamani, Y. (2018. Effect of Drying Conditions on the Catalytic Performance, Structure, and Reaction Rates over the Fe-Co-Mn/MgO Catalyst for Production of Light Olefins. Bulletin of Chemical Reaction Engineering & Catalysis, 13 (1: 97-112 (doi:10.9767/bcrec.13.1.1222.97-112

The effect of magnetic ordering on the giant magnetoresistance of Cr-Fe-V and Cr-Fe-Mn

International Nuclear Information System (INIS)

Somsen, Ch.; Acet, M.; Nepecks, G.; Wassermann, E.F.

2000-01-01

Cr-rich Cr 1-x Fe x alloys with compositions in the vicinity of mixed ferromagnetic and antiferromagnetic exchange (x=0.18) exhibit giant magnetoresistance. In order to understand the influence of the antiferromagnetism of Cr on the giant magnetoresistance one can manipulate the antiferromagnetic exchange either by adding vanadium, which destroys the antiferromagnetism of Cr, or by adding manganese, which enhances it. Cr-Fe-V and Cr-Fe-Mn alloys also have Curie temperatures that lie between low temperatures and room temperature in the concentration region where giant magnetoresistance is observed. Therefore, they are also used as samples to study the magnetoresistance as a function of the strength of FM exchange. We discuss these points in the light of temperature and concentration-dependent magnetoresistance experiments on Cr 0.99-x Fe x V 0.01 , Cr 0.96-x Fe x V 0.04 , Cr 0.90-x Fe x Mn 0.10 and Cr 0.55 Fe x Mn 0.45-x alloys. Results indicate that the most favorable condition for a large magnetoresistance in these alloys occurs at temperatures near the Curie temperature

Nanotextured Spikes of α-Fe2O3/NiFe2O4 Composite for Efficient Photoelectrochemical Oxidation of Water.

Science.gov (United States)

Hussain, Shabeeb; Tavakoli, Mohammad Mahdi; Waleed, Aashir; Virk, Umar Siddique; Yang, Shihe; Waseem, Amir; Fan, Zhiyong; Nadeem, Muhammad Arif

2018-03-27

We demonstrate for the first time the application of p-NiFe 2 O 4 /n-Fe 2 O 3 composite thin films as anode materials for light-assisted electrolysis of water. The p-NiFe 2 O 4 /n-Fe 2 O 3 composite thin films were deposited on planar fluorinated tin oxide (FTO)-coated glass as well as on 3D array of nanospike (NSP) substrates. The effect of substrate (planar FTO and 3D-NSP) and percentage change of each component (i.e., NiFe 2 O 4 and Fe 2 O 3 ) of composite was studied on photoelectrochemical (PEC) water oxidation reaction. This work also includes the performance comparison of p-NiFe 2 O 4 /n-Fe 2 O 3 composite (planar and NSP) devices with pure hematite for PEC water oxidation. Overall, the nanostructured p-NiFe 2 O 4 /n-Fe 2 O 3 device with equal molar 1:1 ratio of NiFe 2 O 4 and Fe 2 O 3 was found to be highly efficient for PEC water oxidation as compared with pure hematite, 1:2 and 1:3 molar ratios of composite. The photocurrent density of 1:1 composite thin film on planar substrate was equal to 1.07 mA/cm 2 at 1.23 V RHE , which was 1.7 times higher current density as compared with pure hematite device (0.63 mA/cm 2 at 1.23 V RHE ). The performance of p-NiFe 2 O 4 /n-Fe 2 O 3 composites in PEC water oxidation was further enhanced by their deposition over 3D-NSP substrate. The highest photocurrent density of 2.1 mA/cm 2 at 1.23 V RHE was obtained for the 1:1 molar ratio p-NiFe 2 O 4 /n-Fe 2 O 3 composite on NSP (NF1-NSP), which was 3.3 times more photocurrent density than pure hematite. The measured applied bias photon-to-current efficiency (ABPE) value of NF1-NSP (0.206%) was found to be 1.87 times higher than that of NF1-P (0.11%) and 4.7 times higher than that of pure hematite deposited on FTO-coated glass (0.044%). The higher PEC water oxidation activity of p-NiFe 2 O 4 /n-Fe 2 O 3 composite thin film as compared with pure hematite is attributed to the Z-path scheme and better separation of electrons and holes. The increased surface area and greater light

Facile synthesis of nanorod-type graphitic carbon nitride/Fe2O3 composite with enhanced photocatalytic performance

International Nuclear Information System (INIS)

Wang, Jiangpeng; Li, Changqing; Cong, Jingkun; Liu, Ziwei; Zhang, Hanzhuo; Liang, Mei; Gao, Junkuo; Wang, Shunli; Yao, Juming

2016-01-01

Here we report a facile synthesis of nanorod-type graphitic carbon nitride/Fe 2 O 3 composite (Fe 2 O 3 -g-C 3 N 4 ) by using Fe-melamine supramolecular framework as precursor. The chemical and optical properties of the nanocomposites are well-characterized. The Fe 2 O 3 -g-C 3 N 4 nanocomposite demonstrated excellent photocatalytic activities under visible light due to the efficient utilization of sunlight and the construction of Z-scheme electron transfer pathway. The results indicated that it could be a promising approach for the preparation of efficient g-C 3 N 4 nanocomposites photocatalysts by using metal-melamine supramolecular framework as precursors. - Graphical abstract: Nanorod-type graphitic carbon nitride/Fe 2 O 3 composite (Fe 2 O 3 -g-C 3 N 4 ) was synthesized by using Fe-melamine supramolecular framework as precursor. The Fe 2 O 3 -g-C 3 N 4 nanocomposite demonstrated excellent photocatalytic activities under visible light. Display Omitted - Highlights: • Nanorod-type graphitic carbon nitride/Fe 2 O 3 composite (Fe 2 O 3 -g-C 3 N 4 ) was synthesized. • Fe 2 O 3 -g-C 3 N 4 showed strong optical absorption in the visible-light region. • The Fe 2 O 3 -g-C 3 N 4 nanocomposite demonstrated excellent photocatalytic activities.

South Fork of the Santa Clara River, Santa Clarita Valley, California. Supplement.

Science.gov (United States)

1985-01-01

designed as a broad - crested weir to pass the maximum probable flood (PF) with a peak of 24,500 ofs. The spillway crest length of 100 feet and the...well as from the Miocene Topanga sandstone and the Modelo shale found near the crest of the Santa Susana Mountains in Aliso and Rice Canyons. Fossil...440 1.5 .IN THE AREA. 1I0.050: DRAINAGE AREA IS QUITE RUGGED, WITH SHARP RIDGES 4.4 600 1.3 .050 AND NARROW, STEEP CANYONS THROUGH WHICH WATERCOURSES

Prevalencia del síndrome metabólico entre los pacientes que asisten al servicio clínica de hipertensión de la Fundación Santa Fe de Bogotá Metabolic syndrome prevalence in patients attending the hypertension clinic at the Fundación Santa Fe de Bogotá

Directory of Open Access Journals (Sweden)

Bernardo Lombo

Full Text Available Antecedentes: en los últimos cinco años han surgido diferentes definiciones para síndrome metabólico, lo cual ha llevado a confusiones. En octubre de 2005, la American Heart Association (AHA propuso algunas recomendaciones y modificaciones para optimizar el uso de los criterios del National Cholesterol Education Program´s Adult Treatment Panel III Report (ATP III. Objetivo: determinar la prevalencia del síndrome metabólico como lo define el ATP III comparado con la definición de la AHA 2005, en los pacientes de la Clínica de Hipertensión de la Fundación Santa Fe de Bogotá. Materiales y métodos: estudio retrospectivo de corte transversal. Se revisaron 550 historias clínicas entre enero de 2004 y septiembre de 2005. Se describió la población a estudio y se estimó la prevalencia de síndrome metabólico según los criterios del ATP III y de la AHA. Resultados: de acuerdo con los criterios del ATP III, la prevalencia del síndrome fue del 27,3% (hombres 19,29%, mujeres 30,05%, mientras que según los criterios de la AHA fue del 75,9% (hombres 77,9% y mujeres 75,25%. Conclusiones: la población a estudio presenta una alta prevalencia de síndrome metabólico de acuerdo con los criterios del ATP III y de la AHA. Los criterios de la AHA identifican una proporción mayor de pacientes con esta patología, y es de mayor utilidad para diagnosticar personas en riesgo e implementar estrategias terapéuticas, cambios de estilo de vida y modificación de factores de riesgo de forma más temprana.Previous history: different definitions for metabolic syndrome have been done during the last five years, generating confusion. In October 2005 the American Heart Association (AHA proposed some recommendations and modifications in order to optimize the use of the National Cholesterol Education Program's Adult Treatment Panel III Report (ATP III criteria. Objective: determine the prevalence of metabolic syndrome as defined by ATP III in comparison with

Searching for high magnetization density in bulk Fe: the new metastable Fe-6 phase

Energy Technology Data Exchange (ETDEWEB)

Umemoto, K; Himmetoglu, B; Wang, JP; Wentzcovitch, RM; Cococcioni, M

2014-11-26

We report the discovery of a new allotrope of iron by first principles calculations. This phase has Pmn2(1) symmetry, a six-atom unit cell (hence the name Fe-6), and the highest magnetization density (M-s) among all the known crystalline phases of iron. Obtained from the structural optimizations of the Fe3C-cementite crystal upon carbon removal, Pmn2(1) Fe-6 is shown to result from the stabilization of a ferromagnetic FCC phase, further strained along the Bain path. Although metastable from 0 to 50 GPa, the new phase is more stable at low pressures than the other well-known HCP and FCC allotropes and smoothly transforms into the FCC phase under compression. If stabilized to room temperature, for example, by interstitial impurities, Fe-6 could become the basis material for high M-s rare-earth-free permament magnets and high-impact applications such as light-weight electric engine rotors or high-density recording media. The new phase could also be key to explaining the enigmatic high M-s of Fe16N2, which is currently attracting intense research activity.

Electronically-driven orthorhombic distortion in FeSe

Science.gov (United States)

Watson, Matthew; Davies, Nathaniel; Haghighirad, Amir; Narayanan, Arjun; Kim, Timur; Hoersch, Moritz; Blake, Samuel; Coldea, Amalia

2015-03-01

FeSe is structurally the simplest of Fe-based superconductors, and exhibits a tetragonal-to-orthorhombic structural transition at ~ 90 K, but no long-range magnetism at any temperature. We report measurements of the resistivity anisotropy in FeSe above Ts finding a large and divergent response to an applied strain, with a comparable magnitude and temperature-dependence to measurements in Ba(Fe1-xCox)2As2, but opposite sign. We compare this data with literature reports on NMR and our own ARPES data, which taken together indicate that the structural transition is electronically-driven with orbital degrees of freedom playing a central role. This work was supported by EPSRC, UK (EP/I004475/1) and Diamond Light Source.

Diversidad y aspectos biológicos de abejas silvestres de un ambiente urbano y otro natural de la región central de Santa Fe, Argentina

Directory of Open Access Journals (Sweden)

Milagros DALMAZZO

2010-01-01

Full Text Available El objetivo del presente trabajo fue relevar el elenco de abejas silvestres en la región central de Santa Fe y comparar la diversidad de especies y aspectos biológicos en dos ambientes de una misma región. Las abejas fueron colectadas en el estrato herbáceo de la Reserva Universitaria “Escuela Granja” de la localidad Esperanza, y en la zona urbana de la localidad Susana, ambas ubicadas dentro de la Provincia Fitogeográfica del Espinal. La colecta se realizó en octubre, noviembre y diciembre de 2004 y en enero, febrero y marzo de 2005, registrando las especies vegetales sobre las que se capturaron. Se colectaron 277 ejemplares en total, de los cuales se identificaron 62 especies (27 géneros en 5 familias. Las curvas de rarefacción indican una tasa de acumulación de especies mayor para la Reserva Ecológica, los índices de diversidad de Shannon son 3,25 para la Reserva Ecológica y 2,64 para la Zona Urbana. Para la comparación de las comunidades en ambos sitios, las abejas fueron clasificadas en tres categorías según la especialización en el uso del recurso floral, sustrato de nidificación y comportamiento social. Se observó una asociación entre los grupos especialistas y de nidificación en el suelo con el ambiente natural, y por otro lado, las especies generalistas y de nidificación en cavidades con el ambiente urbano. No se identificaron diferencias, en cuanto al tipo de comportamiento social de las especies, entre ambos sitios.

Visible light photodegradation of phenanthrene catalyzed by Fe(III)-smectite: Role of soil organic matter

Energy Technology Data Exchange (ETDEWEB)

Jia, Hanzhong, E-mail: jiahz0143@yahoo.com.cn [Laboratory of Eco-Materials and Sustainable Technology (LEMST), Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, Xinjiang 830011 (China); Li, Li [Laboratory of Eco-Materials and Sustainable Technology (LEMST), Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, Xinjiang 830011 (China); The Graduate School of Chinese Academy of Science, Beijing 100049 (China); Fan, Xiaoyun [Laboratory of Eco-Materials and Sustainable Technology (LEMST), Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, Xinjiang 830011 (China); Liu, Mingdeng [Laboratory of Eco-Materials and Sustainable Technology (LEMST), Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, Xinjiang 830011 (China); The Graduate School of Chinese Academy of Science, Beijing 100049 (China); Deng, Wenye [Laboratory of Eco-Materials and Sustainable Technology (LEMST), Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, Xinjiang 830011 (China); Wang, Chuanyi, E-mail: cywang@ms.xjb.ac.cn [Laboratory of Eco-Materials and Sustainable Technology (LEMST), Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, Xinjiang 830011 (China)

2013-07-15

Highlights: • Soil organic matter (SOM) has significant influence on the transformation of PAHs. • Photodegradation rate is strongly dependent on the SOM fractions and their content. • Photolysis is determined by the interaction between phenanthrene, clay and SOM. -- Abstract: In the present study, phenanthrene is employed as a model to explore the roles played by three soil organic matter (SOM) fractions, i.e., dissolved organic matter (DOM), humic acid (HA), and fulvic acid (FA), in its photodegradation with assistance of Fe(III)-smectite under visible-light. Slight decrease in phenanthrene photodegradation rate was observed in the presence of DOM, which is explained in terms of oxidative-radical competition between DOM and target phenanthrene molecules due to the high electron–donor capacity of phenolic moieties in DOM. On the other hand, a critic content is observed with FA (0.70 mg/g) and HA (0.65 mg/g). Before reaching the critic content, the removal of phenanthrene is accelerated; while after that, the photodegradation rate is suppressed. The acceleration of phenanthrene degradation can be attributed to the photosensitization of FA and HA. Due to the strong interaction between phenanthrene and the phenyl rings, however, the retention of phenanthrene on SOM–Fe(III)-smectite in the presence of high content of HA or FA is enhanced, thus slowing down its photodegradation. Those observations provide valuable insights into the transformation and fate of PAHs in the natural soil environment and open a window for using clay–humic substances complexes for remediation of contaminated soil.

Polyaniline nanotubes coated with TiO2&γ-Fe2O3@graphene oxide as a novel and effective visible light photocatalyst for removal of rhodamine B from water

Science.gov (United States)

Ghavami, Monireh; Kassaee, Mohammad Zaman; Mohammadi, Reza; Koohi, Maryam; Haerizadeh, Bibi Narjes

2014-12-01

Synthesis of polyaniline-nanotubes (PANI-NT), in the presence of TiO2 and γ-Fe2O3 functionalized graphene oxide (GO), gives a green and magnetically recyclable photocatalyst, TiO2&γ-Fe2O3@GO/PANI-NT. The later orchestrates 94% photocatalytic efficiency in removal of rhodamine B (RB) from water, under simulated solar light irradiation. This is far higher than the 36% observed in the presence of TiO2&γ-Fe2O3@GO alone, where PANI-NT is excluded from the structure. Morphology, composition, and structural properties of our economically sound photocatalyst are characterized by X-ray diffraction, energy-dispersive X-ray spectroscopy, thermo-gravimetric, transmission electron microscopy, inductively coupled plasma, RAMAN and Fourier-transform infrared spectroscopy.

Hyundai uude turusektorisse

Index Scriptorium Estoniae

1999-01-01

Hyundai Santa Fe Detroidi autonäituselt on esimene Hyundai märgi all valmistamisele tulev sport- ja tarbesõiduki eellane. Santa Fe töötasid välja korea insenerid Ulsanis ja ameerika disainerid firma Californias asuvas arenduskeskuses

77 FR 39725 - Land Acquisitions: Pueblo of Santo Domingo

Science.gov (United States)

2012-07-05

... Counties, New Mexico A parcel of land described as follows: beginning at a monument marking the position..., more or less. Tract B--Ca[ntilde]ada de Santa Fe T. 15 N., R. 7 E., NMPM, Santa Fe County, New Mexico A...

Photoconductivity in BiFeO3 thin films

Science.gov (United States)

Basu, S. R.; Martin, L. W.; Chu, Y. H.; Gajek, M.; Ramesh, R.; Rai, R. C.; Xu, X.; Musfeldt, J. L.

2008-03-01

The optical properties of epitaxial BiFeO3 thin films have been characterized in the visible range. Variable temperature spectra show an absorption onset near 2.17eV, a direct gap (2.667±0.005eV at 300K), and charge transfer excitations at higher energy. Additionally, we report photoconductivity in BiFeO3 films under illumination from a 100mW /cm2 white light source. A direct correlation is observed between the magnitude of the photoconductivity and postgrowth cooling pressure. Dark conductivities increased by an order of magnitude when comparing films cooled in 760 and 0.1Torr. Large increases in photoconductivity are observed in light.

Pronóstico De Mesoescala De Un Evento De Noviembre De 2008 En Santa Catarina Mesoscale forescasting of an event of novenber 2008 in Santa Catharina

Directory of Open Access Journals (Sweden)

Lia Martins Costa do Amaral

2012-12-01

Full Text Available La gran disponibilidad de vapor de agua en los niveles inferiores de la atmósfera, advectada sobre la costa de la provincia de Santa Catarina por el anticiclón semiestacionario del Océano Atlántico, favoreció períodos frecuentes de lluvia durante el mes de noviembre de 2008. La exploración del evento extremo ocurrido en Santa Catarina, que se caracterizó por un intenso bloqueo en niveles altos, se realizó con pronósticos de los modelos del mesoescala MM5 y WRF. Estos modelos fueron procesados con muy alta resolución espacial, abarcando toda la región afectada por el evento severo. La temperatura de la superficie del mar presentaba anomalías positivas de temperatura a lo largo de la costa de Santa Catarina, favoreciendo la transferencia de calor latente hacia la atmósfera, con su posterior advección hacia la zona continental. Los resultados obtenidos con los modelos son consistentes con las observaciones, aunque fuertemente dependientes de la resolución horizontal de los mismos.The large availability of water vapor at low levels of the atmosphere, advected into the coastal region of Santa Catharina State by the Atlantic Ocean semi-stationary anticyclone, provided the frequent and copious rainfall during the November, 2008. One of the most extreme event occurred in Santa Catharina coastal zone, when a quite strong blocking formed at high levels of the atmosphere is explored processing both, the MM5 and WRF mesoscale models. These models were processed with very high spatial resolution domains, covering the entire region affected by the severe event. The sea surface temperature field revealed that there was a large core on Atlantic waters with quite high temperatures along the coast of Santa Catharina, which enhanced the vertical integrated latent heat supply into the continental region by the winds. The models forecasting results showed consistent results with the observations, as well as an indication that coherences are directly

Magnetic x-ray linear dichroism of ultrathin Fe-Ni alloy films

Energy Technology Data Exchange (ETDEWEB)

Schumann, F.O.; Willis, R.F. [Pennsylvania State Univ., University Park, PA (United States); Goodman, K.W. [Lawrence Berkeley National Lab., CA (United States)] [and others

1997-04-01

The authors have studied the magnetic structure of ultrathin Fe-Ni alloy films as a function of Fe concentration by measuring the linear dichroism of the 3p-core levels in angle-resolved photoemission spectroscopy. The alloy films, grown by molecular-beam epitaxy on Cu(001) surfaces, were fcc and approximately four monolayers thick. The intensity of the Fe dichroism varied with Fe concentration, with larger dichroisms at lower Fe concentrations. The implication of these results to an ultrathin film analogue of the bulk Invar effect in Fe-Ni alloys will be discussed. These measurements were performed at the Spectromicroscopy Facility (Beamline 7.0.1) of the Advanced Light Source.

Documentation of the Santa Clara Valley regional ground-water/surface-water flow model, Santa Clara Valley, California

Science.gov (United States)

Hanson, R.T.; Li, Zhen; Faunt, C.C.

2004-01-01

The Santa Clara Valley is a long, narrow trough extending about 35 miles southeast from the southern end of San Francisco Bay where the regional alluvial-aquifer system has been a major source of water. Intensive agricultural and urban development throughout the 20th century and related ground-water development resulted in ground-water-level declines of more than 200 feet and land subsidence of as much as 12.7 feet between the early 1900s and the mid-1960s. Since the 1960s, Santa Clara Valley Water District has imported surface water to meet growing demands and reduce dependence on ground-water supplies. This importation of water has resulted in a sustained recovery of the ground-water flow system. To help support effective management of the ground-water resources, a regional ground-water/surface-water flow model was developed. This model simulates the flow of ground water and surface water, changes in ground-water storage, and related effects such as land subsidence. A numerical ground-water/surface-water flow model of the Santa Clara Valley subbasin of the Santa Clara Valley was developed as part of a cooperative investigation with the Santa Clara Valley Water District. The model better defines the geohydrologic framework of the regional flow system and better delineates the supply and demand components that affect the inflows to and outflows from the regional ground-water flow system. Development of the model includes revisions to the previous ground-water flow model that upgraded the temporal and spatial discretization, added source-specific inflows and outflows, simulated additional flow features such as land subsidence and multi-aquifer wellbore flow, and extended the period of simulation through September 1999. The transient-state model was calibrated to historical surface-water and ground-water data for the period 197099 and to historical subsidence for the period 198399. The regional ground-water flow system consists of multiple aquifers that are grouped

Phenotypic, Molecular and Symbiotic Characterization of the Rhizobial Symbionts of Desmanthus paspalaceus (Lindm.) Burkart That Grow in the Province of Santa Fe, Argentina

Science.gov (United States)

Fornasero, Laura Viviana; Del Papa, María Florencia; López, José Luis; Albicoro, Francisco Javier; Zabala, Juan Marcelo; Toniutti, María Antonieta; Pensiero, José Francisco; Lagares, Antonio

2014-01-01

Desmanthus paspalaceus (Lindm.) Burkart belongs to the D. virgatus complex, subfamily Mimosoidae. The known potential as livestock fodder of several of these legumes prompted us to undertake a phenotypic, molecular, and symbiotic characterization of the D. paspalaceus symbionts in the Santa Fe province, Argentina. The rhizobia collected—containing isolates with different abiotic-stress tolerances—showed a remarkable genetic diversity by PCR fingerprinting, with 11 different amplification profiles present among 20 isolates. In selected isolates 16S-rDNA sequencing detected mesorhizobia (60%) and rhizobia (40%) within the collection, in contrast to the genus of the original inoculant strain CB3126—previously isolated from Leucaena leucocephala—that we typified here through its 16S rDNA as Sinorhizobium terangae. The results revealed the establishment by diverse bacterial genera -rhizobia, sinorhizobia, and mesorhizobia- of full N2-fixing symbiotic associations with D. paspalaceus. This diversity was paralleled by the presence of at least two different nodC allelic variants. The identical nodC alleles of the Mesorhizobia sp. 10.L.4.2 and 10.L.5.3 notably failed to group within any of the currently described rhizo-/brady-/azorhizobial nodC clades. Interestingly, the nodC from S. terangae CB3126 clustered close to homologs from common bean nodulating rhizobia, but not with the nodC from S. terangae WSM1721 that nodulates Acacia. No previous data were available on nod-gene phylogeny for Desmanthus symbionts. A field assay indicated that inoculation of D. paspalaceus with the local Rhizobium sp. 10L.11.4 produced higher aerial-plant dry weights compared to S. teranga CB3126–inoculated plants. Neither the mesorhizobia 10.L.4.2 or 10.L.5.3 nor the rhizobium 10L.11.4 induced root nodules in L. leucocephala or P. vulgaris. The results show that some of the local isolates have remarkable tolerances to several abiotic stresses including acidity, salt, and temperature

Photo-induced antiferromagnetic interlayer coupling in Fe superlattices with iron silicide spacers

Energy Technology Data Exchange (ETDEWEB)

Mattson, J.E.; Fullerton, E.E.; Kumar, S.; Lee, S.R.; Sowers, C.H.; Grimsditch, M.; Bader, S.D. [Argonne National Lab., IL (United States); Parker, F.T. [California Univ., San Diego, La Jolla, CA (United States). Center for Magnetic Recording Research

1993-09-01

Sputtered Fe/FeSi films possessing antiferromagnetic (AF) interlayer coupling at room temperature develop ferromagnetic remanence when cooled below 100K, but the AF coupling can be restored at low temperature by exposure to visible light of sufficient intensity (>10 mW/mm{sup 2}). We attribute these effects to charge carriers in the FeSi spacer layer which, when thermally or photo-generated, are capable of communicating spin information between the Fe layers.

Variabilidade em matrizes de acessos de espinheira-santa Variability in matrices of espinheira-santa accessions

Directory of Open Access Journals (Sweden)

Márcio Paim Mariot

2008-04-01

Full Text Available Maytenus ilicifolia e M. aquifolium são espécies nativas do Brasil, popularmente conhecidas como espinheira-santa, sendo indicadas para gastrite e para úlcera estomacal. A Embrapa Clima Temperado e a Universidade Federal de Pelotas (UFPel mantêm um banco de germoplasma destas espécies. Com o objetivo de identificar a variabilidade fenotípica para alguns caracteres morfológicos em matrizes de espinheira-santa, estimar a dissimilaridade e agrupar os acessos através de análises multivariadas, 105 acessos foram caracterizados morfologicamente. Foram avaliados os caracteres comprimento e largura de fruto, número de sementes por fruto, comprimento e largura de folha, relação comprimento/largura de folha e número de espinhos por folha. Foi estimada a distância euclidiana e os acessos foram agrupados pelo método de otimização de Tocher. Foi observada uma ampla variabilidade para todos os caracteres analisados. O número de espinhos por folha foi o caráter que mais contribuiu para a divergência. Os caracteres morfológicos permitiram separar os acessos em sete grupos. A maior dissimilaridade foi entre os acessos 57 (M. ilicifolia e 91 (M. aquifolium. Não foi evidenciada uma separação de acordo com a localização geográfica dos acessos. Na análise de agrupamento foram identificados dois grupos que apresentavam tanto acessos de M. ilicifolia quanto de M. aquifolium, o que indica proximidade filogenética entre estas espécies.Maytenus ilicifolia and M. aquifolium are native Brazilian species popularly known as espinheira-santa, being indicated for gastritis and stomach ulcer. Embrapa Clima Temperado and Universidade Federal de Pelotas (UFPel keep a gene bank of these species. With the objective of identifing phenotypic variability for some morphological characters in matrices of espinheira-santa, estimating dissimilarity and clustering accessions through multivariate analysis, 105 accessions had been morphologically characterized

Islas de Old Providence y Santa Catalina. Presente y futuro

Directory of Open Access Journals (Sweden)

June Marie Mow

2005-11-01

Full Text Available Las Islas de Providencia y Santa Catalina ofrecen una combinación única de diversidad biológica y autenticidad cultural, convirtiéndose en las Islas menos degradadas ambiental y culturalmente en el Caribe; son áreas naturales, con bajos niveles de turismo, relativamente intactas en las cuales la comunidad isleña nativa local juega un papel significativo. La falta de una marca como destino turístico único nacional e internacionalmente, la baja conectividad, la carencia de una estrategia promocional, así como la baja importancia del sector para el gobierno local, brindan la oportunidad para que el ecoturismo trabaje para la gente de Old Providence y Santa Catalina bajo sus propias reglas de juego y que la voluntad política no sea desviada por ganancias de corto plazo o esquemas superficialmente muy atractivos, pero que no generan beneficios para la población local. La visión de la gente de Old Providence y Santa Catalina es que, sea el ecoturismo la forma de ofrecer nuevas opciones socioeconómicas a las poblaciones locales para que puedan obtener los beneficios de sus senderos, playas, arrecifes y áreas naturales, la tradición, y cultura local. Para ello, es posible aprovechar de manera sostenible la introducción de un nuevo paradigma para el desarrollo sostenible de Old Providence y Santa Catalina: La Reserva de Biosfera Seaflower.

Acid drainage at the inactive Santa Lucia mine, western Cuba: Natural attenuation of arsenic, barium and lead, and geochemical behavior of rare earth elements

Energy Technology Data Exchange (ETDEWEB)

Romero, Francisco Martin, E-mail: fmrch@geologia.unam.mx [Instituto de Geologia, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, Delegacion Coyoacan, 04510 Mexico D.F. (Mexico); Prol-Ledesma, Rosa Maria; Canet, Carles [Instituto de Geofisica, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, Delegacion Coyoacan, 04510 Mexico D.F. (Mexico); Alvares, Laura Nunez; Perez-Vazquez, Ramon [Facultad de Geologia y Mecanica, Universidad de Pinar del Rio (Cuba)

2010-05-15

A detailed geochemical study was conducted at the inactive Zn-Pb mine of Santa Lucia, in western Cuba. The studied mine-wastes are characterized by high total concentrations of potentially toxic elements (PTE), with average values of 17.4% Fe, 5.47% Ba, 2.27% Pb, 0.83% Zn, 1724 mg/kg As and 811 mg/kg Cu. Oxidation of sulfide minerals in mine-waste dumps and in the open pit produces acid mine effluents (pH = 2.5-2.6) enriched in dissolved SO{sub 4}{sup 2-} (up to 6754 mg/L), Fe (up to 4620 mg/L) and Zn (up to 2090 mg/L). Low pH values (2.5-2.8) and high dissolved concentrations of the same PTE were found in surface waters, up to 1500 m downstream from the mine. Nevertheless, concentrations of As, Ba and Pb in acid mine effluents and impacted surface waters are relatively low: 0.01-0.3 mg/L As, 0.002-0.03 mg/L Ba and 0.3-4.3 mg/L Pb. Analysis by X-ray diffraction and electron microscopy revealed the occurrence of lead-bearing barite and beudantite and the more common solid phases, reported elsewhere in similar environments including Fe-oxyhydroxides, jarosite, anglesite and plumbojarosite. Because the reported solubilities for barite and beudantite are very low under acidic conditions, these minerals may serve as the most important control in the mobility of As, Ba and Pb. In contrast, Fe-oxyhydroxides are relatively soluble under acidic conditions and, therefore, they may have a less significant role in PTE on-site immobilization. Mine-wastes and stream sediments show a light REE (LREE) and middle REE (MREE) enrichment relative to heavy REE (HREE). In contrast, acid mine effluents and surface waters are enriched in HREE relative to LREE. These results suggest that the LREE released during the oxidation of sulfides are captured by secondary (weathering) minerals, while the MREE are removed from the altered rocks. The low concentrations of LREE in acid stream water suggest that these elements can be retained in the sediments more strongly than HREE and MREE. One

Multiepoch Spectropolarimetry of SN 2011fe

International Nuclear Information System (INIS)

Milne, Peter A.; Williams, G. Grant; Smith, Paul S.; Smith, Nathan; Jannuzi, Buell T.; Green, E. M.; Porter, Amber; Leising, Mark D.

2017-01-01

We present multiple spectropolarimetric observations of the nearby Type Ia supernova (SN) 2011fe in M101, obtained before, during, and after the time of maximum apparent visual brightness. The excellent time coverage of our spectropolarimetry has allowed better monitoring of the evolution of polarization features than is typical, which has allowed us new insight into the nature of normal SNe Ia. SN 2011fe exhibits time-dependent polarization in both the continuum and strong absorption lines. At early epochs, red wavelengths exhibit a degree of continuum polarization of up to 0.4%, likely indicative of a mild asymmetry in the electron-scattering photosphere. This behavior is more common in subluminous SNe Ia than in normal events, such as SN 2011fe. The degree of polarization across a collection of absorption lines varies dramatically from epoch to epoch. During the earliest epoch, a λ 4600–5000 Å complex of absorption lines shows enhanced polarization at a different position angle than the continuum. We explore the origin of these features, presenting a few possible interpretations, without arriving at a single favored ion. During two epochs near maximum, the dominant polarization feature is associated with the Si ii λ 6355 Å absorption line. This is common for SNe Ia, but for SN 2011fe the polarization of this feature increases after maximum light, whereas for other SNe Ia, that polarization feature was strongest before maximum light.

Multiepoch Spectropolarimetry of SN 2011fe

Energy Technology Data Exchange (ETDEWEB)

Milne, Peter A.; Williams, G. Grant; Smith, Paul S.; Smith, Nathan; Jannuzi, Buell T.; Green, E. M. [University of Arizona, Steward Observatory, 933 N. Cherry Avenue, Tucson, AZ 85721 (United States); Porter, Amber; Leising, Mark D. [118 Kinard Laboratory, Clemson University, Clemson, SC 29634 (United States)

2017-01-20

We present multiple spectropolarimetric observations of the nearby Type Ia supernova (SN) 2011fe in M101, obtained before, during, and after the time of maximum apparent visual brightness. The excellent time coverage of our spectropolarimetry has allowed better monitoring of the evolution of polarization features than is typical, which has allowed us new insight into the nature of normal SNe Ia. SN 2011fe exhibits time-dependent polarization in both the continuum and strong absorption lines. At early epochs, red wavelengths exhibit a degree of continuum polarization of up to 0.4%, likely indicative of a mild asymmetry in the electron-scattering photosphere. This behavior is more common in subluminous SNe Ia than in normal events, such as SN 2011fe. The degree of polarization across a collection of absorption lines varies dramatically from epoch to epoch. During the earliest epoch, a λ 4600–5000 Å complex of absorption lines shows enhanced polarization at a different position angle than the continuum. We explore the origin of these features, presenting a few possible interpretations, without arriving at a single favored ion. During two epochs near maximum, the dominant polarization feature is associated with the Si ii λ 6355 Å absorption line. This is common for SNe Ia, but for SN 2011fe the polarization of this feature increases after maximum light, whereas for other SNe Ia, that polarization feature was strongest before maximum light.

Variability of Fe isotope compositions of hydrothermal sulfides and oxidation products at mid-ocean ridges

Science.gov (United States)

Li, Xiaohu; Wang, Jianqiang; Chu, Fengyou; Wang, Hao; Li, Zhenggang; Yu, Xing; Bi, Dongwei; He, Yongsheng

2018-04-01

Significant Fe isotopic fractionation occurs during the precipitation and oxidative weathering of modern seafloor hydrothermal sulfides, which has an important impact on the cycling of Fe isotopes in the ocean. This study reports the Fe-isotope compositions of whole-rock sulfides and single-mineral pyrite collected from hydrothermal fields at the South Mid-Atlantic Ridge (SMAR) and the East Pacific Rise (EPR) and discusses the impacts of precipitation and late-stage oxidative weathering of sulfide minerals on Fe isotopic fractionation. The results show large variation in the Fe-isotope compositions of the sulfides from the different hydrothermal fields on the mid-oceanic ridges, indicating that relatively significant isotope fractionation occurs during the sulfide precipitation and oxidative weathering processes. The Fe-isotope compositions of the sulfides from the study area at the SMAR vary across a relatively small range, with an average value of 0.01‰. This Fe-isotope composition is similar to the Fe-isotope composition of mid-oceanic ridge basalt, which suggests that Fe was mainly leached from basalt. In contrast, the Fe-isotope composition of the sulfides from the study area at the EPR are significantly enriched in light Fe isotopes (average value - 1.63‰), mainly due to the kinetic fractionation during the rapid precipitation process of hydrothermal sulfide. In addition, the pyrite from different hydrothermal fields is enriched in light Fe isotopes, which is consistent with the phenomenon in which light Fe isotopes are preferentially enriched during the precipitation of pyrite. The red oxides have the heaviest Fe-isotope compositions (up to 0.80‰), indicating that heavy Fe isotopes are preferentially enriched in the oxidation product during the late-stage oxidation process. The data obtained from this study and previous studies show a significant difference between the Fe-isotope compositions of the sulfides from the SMAR and EPR. The relatively heavy

Photodegradation of amoxicillin by catalyzed Fe3+/H2O2 process

Institute of Scientific and Technical Information of China (English)

Xiaoming Li; Tingting Shen; Dongbo Wang; Xiu Yue; Xian Liu; Qi Yang; Jianbin Cao; Wei Zheng; Guangming Zeng

2012-01-01

Three oxidation processes of UV-Fe3+(EDTA)/H2O2 (UV:ultraviolet light; EDTA:ethylenediaminetetraacetic acid),UV-Fe3+/H2O2 and Fe3+/H2O2 were simultaneously investigated for the degradation of amoxicillin at pH 7.0.The results indicated that,100% amoxicillin degradation and 81.9% chemical oxygen demand (CODcr) removal could be achieved in the UV-Fe3+ (EDTA)/H2O2 process.The treatment efficiency of amoxicillin and CODcr removal were found to decrease to 59.0% and 43.0% in the UV-Fe3+/H2O2 process;39.6% and 31.3% in the Fe3+/H2O2 process.Moreover,the results of biodegradability (biological oxygen demand (BOD5)/CODCr ratio) revealed that the UV-Fe3+ (EDTA)/H2O2 process was a promising strategy to degrade amoxicillin as the biodegradability of the effluent was improved to 0.45,compared with the cases of UV-Fe3+/H2O2 (0.25) and Fe3+/H2O2 (0.10) processes.Therefore,it could be deduced that EDTA and UV light performed synergetic catalytic effect on the Fe3+/H2O2 process,enhancing the treatment efficiency.The degradation mechanisms were also investigated via UV-Vis spectra,and high performance liquid chromatography-mass spectra.The degradation pathway of amoxicillin was further proposed.

Plastic deformation of FeSi at high pressures: implications for planetary cores

Science.gov (United States)

Kupenko, Ilya; Merkel, Sébastien; Achorner, Melissa; Plückthun, Christian; Liermann, Hanns-Peter; Sanchez-Valle, Carmen

2017-04-01

The cores of terrestrial planets is mostly comprised of a Fe-Ni alloy, but it should additionally contain some light element(s) in order to explain the observed core density. Silicon has long been considered as a likely candidate because of geochemical and cosmochemical arguments: the Mg/Si and Fe/Si ratios of the Earth does not match those of the chondrites. Since silicon preferentially partition into iron-nickel metal, having 'missing' silicon in the core would solve this problem. Moreover, the evidence of present (e.g. Mercury) or ancient (e.g. Mars) magnetic fields on the terrestrial planets is a good indicator of (at least partially) liquid cores. The estimated temperature profiles of these planets, however, lay below iron melting curve. The addition of light elements in their metal cores could allow reducing their core-alloy melting temperature and, hence, the generation of a magnetic field. Although the effect of light elements on the stability and elasticity of Fe-Ni alloys has been widely investigated, their effect on the plasticity of core materials remains largely unknown. Yet, this information is crucial for understanding how planetary cores deform. Here we investigate the plastic deformation of ɛ-FeSi up to 50 GPa at room temperature employing a technique of radial x-ray diffraction in diamond anvil cells. Stoichiometric FeSi endmember is a good first-order approximation of the Fe-FeSi system and a good starting material to develop new experimental perspectives. In this work, we focused on the low-pressure polymorph of FeSi that would be the stable phase in the cores of small terrestrial planets. We will present the analysis of measured data and discuss their potential application to constrain plastic deformation in planetary cores.

Metagenomes from two microbial consortia associated with Santa Barbara seep oil.

Science.gov (United States)

Hawley, Erik R; Malfatti, Stephanie A; Pagani, Ioanna; Huntemann, Marcel; Chen, Amy; Foster, Brian; Copeland, Alexander; del Rio, Tijana Glavina; Pati, Amrita; Jansson, Janet R; Gilbert, Jack A; Tringe, Susannah Green; Lorenson, Thomas D; Hess, Matthias

2014-12-01

The metagenomes from two microbial consortia associated with natural oils seeping into the Pacific Ocean offshore the coast of Santa Barbara (California, USA) were determined to complement already existing metagenomes generated from microbial communities associated with hydrocarbons that pollute the marine ecosystem. This genomics resource article is the first of two publications reporting a total of four new metagenomes from oils that seep into the Santa Barbara Channel. Copyright © 2014 Elsevier B.V. All rights reserved.

Photolysis of polycyclic aromatic hydrocarbons (PAHs) on Fe3+-montmorillonite surface under visible light: Degradation kinetics, mechanism, and toxicity assessments.

Science.gov (United States)

Zhao, Song; Jia, Hanzhong; Nulaji, Gulimire; Gao, Hongwei; Wang, Fu; Wang, Chuanyi

2017-10-01

Photochemical behavior of various polycyclic aromatic hydrocarbons (PAHs) on Fe 3+ -modified montmorillonite was explored to determine their potential kinetics, pathways, and mechanism under visible light. Depending on the type of PAH molecules, the transformation rate follows the order of benzo[a]pyrene ≈ anthracene > benzo[a]anthracene > phenanthrene. Quantum simulation results confirm the crucial role of "cation-π" interaction between Fe 3+ and PAHs on their transformation kinetics. Primary intermediates, including quinones, ring-opening products and benzene derivatives, were identified by gas chromatography-mass spectrometer (GC-MS), and the possible photodegradation pathway of benzo[a]pyrene was proposed. Meanwhile, radical intermediates, such as reactive oxygen species (ROS) and free organic radicals, were detected by electron paramagnetic resonance (EPR) technique. The photolysis of selected PAHs, such as anthracene and benzo[a]pyrene, on clay surface firstly occurs by electron transfer from PAHs to Fe 3+ -montmorillonite, followed by degradation involving photo-induced ROS such as ·OH and ·O 2 - . To investigate the acute toxicity of photolysis products, the Microtox ® toxicity test was performed during the photodegradation processes of various PAHs. As a result, the photo-irradiation initially induces increased toxicity by generating reactive intermediates, such as free organic radicals, and then the toxicity gradually decreases with increasing of reaction time. Overall, the present study provides useful information to understand the fate and photo-transformation of PAHs in contaminated soils. Copyright © 2017 Elsevier Ltd. All rights reserved.

The SantaBot experiment

DEFF Research Database (Denmark)

Hansen, Søren Tranberg; Svenstrup, Mikael; Andersen, Hans Jørgen

2009-01-01

The video shows how an autonomous mobile robot dressed as Santa Claus is interacting with people in a shopping mall. The underlying hypothesis is that it is possible to create interesting new living spaces and induce value in terms of experiences, information or economics, by putting socially...... interactive mobile agents into public urban transit area. To investigate the hypothesis, an experiment was carried out using a robot capable of navigating autonomously based on the input of an onboard laser scanner. The robot would detect and follow random people, who afterwards were asked to fill out...

75 FR 16493 - Announcement of Funding Awards for the Public and Indian Housing Family Self-Sufficiency Program...

Science.gov (United States)

2010-04-01

... Orleans..... LA 70122 68,000 Orleans. Jefferson Parish Housing 1718 Betty Street.... Marrero......... LA 70072 45,893 Authority. Shreveport Housing Authority. 2500 Line Avenue..... Shreveport...... LA 71104 36... Vista Street Santa Fe........ NM 87505 55,908 Authority. Santa Fe County Housing 52 Camino De Jacobo...

77 FR 45373 - National Register of Historic Places; Notification of Pending Nominations and Related Actions

Science.gov (United States)

2012-07-31

... Highlands, 12000529 Morris County Mount Hope Miners' Church, Mount Hope Rd., Rockaway, 12000530 NEW YORK... Veterans Administration Hospital Historic District, (United States Second Generation Veterans Hospitals MPS...'' Trail Segment, (Santa Fe Trail MPS) NW. corner of 85th & Manchester, Kansas City, 12000525 New Santa Fe...

Uranium and thorium determination in Santa Quiteria liquor by ICP-OES analysis

International Nuclear Information System (INIS)

Pedro Junior, A.; Rezende, Paulo R.; Carvalho, Leonel M.; Ferreira, Elizabeth de Massena

2009-01-01

The mineral source of Itataia located in Santa Quiteria (Ceara/Brazil) is a phosphorus uraniferous one, where uranium occurs in collophanite (fluoroapatite) form. Phosphate minerals of the apatite family make possible the uses of uranium as a byproduct. The sulfuric leaching of the phosphate rock in order to obtain phosphoric acid also permits uranium recovery. Thus, the liquor coming from the leaching contains high levels of phosphoric acid as well as elements like Mg, Fe, U, Zr, Th and some rare earths in significant concentrations. The direct determination of U and Th content of this liquor is essential to a rapid response in the uranium separation and purification together process by solvent extraction, aiming its use for commercial purposes, as nuclear industry fuel. In this study U and Th were determined by Inductively Coupled Plasma Spectrometry (ICP-OES) in several samples of liquor, in high concentrations of H 3 PO 4 in environment. Several ratios of U/Th and H 3 PO 4 concentrations were studied, in order to find the optimal conditions for the direct determination of U and Th, without need to prior separation. (author)

Thermal evolution of exchange interactions in lightly doped barium hexaferrites

Energy Technology Data Exchange (ETDEWEB)

Trukhanov, S.V., E-mail: truhanov@ifttp.bas-net.by [National University of Science and Technology MISiS, Leninsky Prospekt, 4, 119049 Moscow (Russian Federation); SSPA “Scientific and practical materials research centre of NAS of Belarus”, P. Brovki Str., 19, 220072 Minsk, Belorussia (Belarus); Trukhanov, A.V. [National University of Science and Technology MISiS, Leninsky Prospekt, 4, 119049 Moscow (Russian Federation); SSPA “Scientific and practical materials research centre of NAS of Belarus”, P. Brovki Str., 19, 220072 Minsk, Belorussia (Belarus); Kostishyn, V.G.; Panina, L.V. [National University of Science and Technology MISiS, Leninsky Prospekt, 4, 119049 Moscow (Russian Federation); Turchenko, V.A. [Joint Institute for Nuclear Research, Joliot-Curie Str., 141980 Dubna (Russian Federation); Donetsk Institute of Physics and Technology named after A.A. Galkin of the NAS of Ukraine, 72 R.Luxemburg Str., 83114 Donetsk (Ukraine); Kazakevich, I.S. [SSPA “Scientific and practical materials research centre of NAS of Belarus”, P. Brovki Str., 19, 220072 Minsk, Belorussia (Belarus); Trukhanov, An.V. [National University of Science and Technology MISiS, Leninsky Prospekt, 4, 119049 Moscow (Russian Federation); SSPA “Scientific and practical materials research centre of NAS of Belarus”, P. Brovki Str., 19, 220072 Minsk, Belorussia (Belarus); Trukhanova, E.L.; Natarov, V.O. [SSPA “Scientific and practical materials research centre of NAS of Belarus”, P. Brovki Str., 19, 220072 Minsk, Belorussia (Belarus); Balagurov, A.M. [Joint Institute for Nuclear Research, Joliot-Curie Str., 141980 Dubna (Russian Federation)

2017-03-15

The lightly doped BaFe{sub 12−x}D{sub x}O{sub 19} (D=Al{sup 3+}, In{sup 3+}; x=0.1 and 0.3) polycrystalline hexaferrite samples have been investigated by powder neutron diffractometry as well as by vibration sample magnetometry in a wide temperature range from 4 K up to 740 K and in magnetic field up to 14 T to establish the nature of Fe{sup 3+}(Al{sup 3+}, In{sup 3+}) – O{sup 2-} - Fe{sup 3+}(Al{sup 3+}, In{sup 3+}) indirect exchange interactions. The crystal structure features such as the ionic coordinates and lattice parameters have been defined and Rietveld refined. The Invar effect has been observed in low temperature range below 150 K. It was explained by the thermal oscillation anharmonicity of ions. It is established that the ferrimagnet-paramagnet phase transition is a standard second-order one. From the macroscopic magnetization measurement the Curie temperature and ordered magnetic moment per nominal iron ion are obtained. From the microscopic diffraction measurement the magnetic moments at all the nonequivalent ionic positions and total magnetic moment per iron ion have been obtained at different temperatures down to 4 K. The light diamagnetic doping mechanism and magnetic structure model are proposed. The effect of light diamagnetic doping on nature of Fe{sup 3+}(Al{sup 3+}, In{sup 3+}) – O{sup 2-} - Fe{sup 3+}(Al{sup 3+}, In{sup 3+}) indirect exchange interactions with temperature increase is discussed. - Highlights: • Crystal structure for lightly doped barium hexaferrites was investigated. • Atomic coordinates and lattice parameters were Rietveld refined. • Magnetic properties for lightly doped barium hexaferrites was investigated. • Magnetic structure for lightly doped barium hexaferrites was investigated. • Magnetic moments at different position and total moment per iron ion were defined.

Blue shift in optical absorption, magnetism and light-induced superparamagnetism in γ-Fe{sub 2}O{sub 3} nanoparticles formed in dendrimer

Energy Technology Data Exchange (ETDEWEB)

Domracheva, Natalia E., E-mail: ndomracheva@gmail.com; Vorobeva, Valerya E. [Zavoisky Kazan Physical-Technical Institute (Russian Federation); Gruzdev, Matvey S. [Institute of Solution Chemistry (Russian Federation); Pyataev, Andrew V. [Kazan Federal University (Russian Federation)

2015-02-15

We are presenting the investigation of the optical, magnetic, and photoinduced superparamagnetic properties of single-domain γ-Fe{sub 2}O{sub 3} nanoparticles (NPs) with diameters of about 2.5 nm formed in second-generation poly(propylene imine) dendrimer. The optical absorption studies indicated direct allowed transition with the band gap (4.5 eV), which is blue shift with respect to the value of the bulk material. Low-temperature blocking of the NPs magnetic moments at 18 K is determined by SQUID measurements. The influence of pulsed laser irradiation on the superparamagnetic properties of γ-Fe{sub 2}O{sub 3} NPs was studied by EPR spectroscopy. It has been shown that irradiation of the sample held in vacuo and cooled in zero magnetic field to 6.9 K leads to the appearance of a new EPR signal, which decays immediately after the irradiation is stopped. The appearance and disappearance of this new signal can be repeated many times at 6.9 K when we turn on/turn off the laser. We suppose that the generation of conduction band electrons by irradiation into the band gap of the γ-Fe{sub 2}O{sub 3} changes the superparamagnetic properties of NPs. Graphical Abstract: Features of the behavior of single-domain γ-Fe{sub 2}O{sub 3} nanoparticles formed in dendrimer were found by UV-Vis and EPR spectroscopy: “blue” shift in optical absorption, a significant increase in the band gap width and variation of superparamagnetic properties under light irradiation.

Estrutura de informação sobre comércio exterior em Santa Catarina

OpenAIRE

Lino, Sônia Regina Lamego

2001-01-01

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Sócio-Econômico O trabalho tem como objetivo geral estudar a estrutura de informação sobre comércio exterior em Santa Catarina e o uso dessa estrutura de informação pelos usuários das médias empresas do setor moveleiro catarinense que exportam para o MERCOSUL. Os objetivos específicos são: 1) identificar as instituições públicas e privadas que mantêm estrutura de informações sobre comércio exterior em Santa Catarina; 2...

GLOBULAR CLUSTER ABUNDANCES FROM HIGH-RESOLUTION, INTEGRATED-LIGHT SPECTROSCOPY. IV. THE LARGE MAGELLANIC CLOUD: α, Fe-PEAK, LIGHT, AND HEAVY ELEMENTS

International Nuclear Information System (INIS)

Colucci, Janet E.; Bernstein, Rebecca A.; Cameron, Scott A.; McWilliam, Andrew

2012-01-01

We present detailed chemical abundances in eight clusters in the Large Magellanic Cloud (LMC). We measure abundances of 22 elements for clusters spanning a range in age of 0.05-12 Gyr, providing a comprehensive picture of the chemical enrichment and star formation history of the LMC. The abundances were obtained from individual absorption lines using a new method for analysis of high-resolution (R ∼ 25,000), integrated-light (IL) spectra of star clusters. This method was developed and presented in Papers I, II, and III of this series. In this paper, we develop an additional IL χ 2 -minimization spectral synthesis technique to facilitate measurement of weak (∼15 mÅ) spectral lines and abundances in low signal-to-noise ratio data (S/N ∼ 30). Additionally, we supplement the IL abundance measurements with detailed abundances that we measure for individual stars in the youngest clusters (age +0.5) and increases with decreasing age, indicating a strong contribution of low-metallicity asymptotic giant branch star ejecta to the interstellar medium throughout the later history of the LMC. We also find a correlation of IL Na and Al abundances with cluster mass in the sense that more massive, older clusters are enriched in the light elements Na and Al with respect to Fe, which implies that these clusters harbor star-to-star abundance variations as is common in the MW. Lower mass, intermediate-age, and young clusters have Na and Al abundances that are lower and more consistent with LMC field stars. Our results can be used to constrain both future chemical evolution models for the LMC and theories of globular cluster formation.

Intrinsic Properties of Fe-Substituted L1(0) Magnets

Energy Technology Data Exchange (ETDEWEB)

Manchanda, P; Kumar, P; Kashyap, A; Lucis, MJ; Shield, JE; Mubarok, A; Goldstein, JI; Constantinides, S; Barmak, K; Lewis, LH; Sellmyer, DJ; Skomski, R

2013-10-01

First-principle supercell calculations are used to determine how 3d elemental additions, especially Fe additions, modify the magnetization, exchange and anisotropy of L1(0)-ordered ferromagnets. Calculations are performed using the VASP code and partially involve configurational averaging over site disorder. Three isostructural systems are investigated: Fe-Co-Pt, Mn-Al-Fe, and transition metal-doped Fe-Ni. In all three systems the iron strongly influences the magnetic properties of these compounds, but the specific effect depends on the host. In CoPt(Fe) iron enhances the magnetization, with subtle changes in the magnetic moments that depend on the distribution of the Fe and Co atoms. The addition of Fe to MnAl is detrimental to the magnetization, because it creates antiferromagnetic exchange interactions, but it enhances the magnetic anisotropy. The replacement of 50% of Mn by Fe in MnFeAl2 enhances the anisotropy from 1.77 to 2.5 MJ/m(3). Further, the substitution of light 3d elements such as Ti, V, Cr into L1(0)-ordered FeNi is shown to substantially reduce the magnetization.

XFEL diffraction measurements of shocked Fe and Fe alloys for planetary science

Science.gov (United States)

Krygier, Andrew; Harmand, M.; Morard, G.; Nemausat, R.; Fiquet, G.; McBride, E.; Appel, K.; Albertazzi, B.; Benuzzi-Mounaix, A.; Koenig, M.; Vinci, T.; Kodama, R.; Miyanishi, K.; Ozaki, N.; Hartley, N.; Konopkova, Z.; Galtier, E.; Lee, H.-J.; Nagler, B.; Svitlyk, V.

2017-10-01

Earth's core is composed of Fe mixed with small amounts of light elements like Si, O, and C. Determining the phase relations of Fe and derivative alloys is important for understanding the cores of Earth and terrestrial exoplanets. High pressure and temperature conditions can be achieved with high power lasers, but the states are highly transient and their characterization has been limited by the lack of appropriate platforms. The recent advance of facilities with high-power lasers coupled to XFELs enables characterization of shocked states with the powerful suite of X-ray techniques used by the static community. Here we present results from recent X-ray diffraction measurements of shocked Fe alloys at the coupled XFEL-optical laser at SACLA (EH5) and LCLS (MEC). This work is supported by the French Agence Nationale de la Recherche with the ANR IRONFEL 12-PDOC-0011, the ERC PLANETDIVE, and under the auspices of the Lawrence Livermore National Security, LLC, (LLNS) under Contract No. DE-AC52-07NA27344.

Fe(III)-solar light induced degradation of diethyl phthalate (DEP) in aqueous solutions.

Science.gov (United States)

Mailhot, G; Sarakha, M; Lavedrine, B; Cáceres, J; Malato, S

2002-11-01

The degradation of diethyl phthalate (DEP) photoinduced by Fe(III) in aqueous solutions has been investigated under solar irradiation in the compound parabolic collector reactor at Plataforma Solar de Almeria. Hydroxyl radicals *OH, responsible of the degradation, are formed via an intramolecular photoredox process in the excited state of Fe(III) aquacomplexes. The primary step of the reaction is mainly due to the attack of *OH radicals on the aromatic ring. For prolonged irradiations DEP and its photoproducts are completely mineralized due to the regeneration of the absorbing species and the continuous formation of *OH radicals that confers a catalytic aspect to the process. Consequently, the degradation photoinduced by Fe(III) could be an efficient method of DEP removal from water.

Organometallic Routes into the Nanorealms of Binary Fe-Si Phases

Directory of Open Access Journals (Sweden)

Teddy M. Keller

2010-02-01

Full Text Available The Fe-Si binary system provides several iron silicides that have varied and exceptional material properties with applications in the electronic industry. The well known Fe-Si binary silicides are Fe3Si, Fe5Si3, FeSi, a-FeSi2 and b-FeSi2. While the iron-rich silicides Fe3Si and Fe5Si3 are known to be room temperature ferromagnets, the stoichiometric FeSi is the only known transition metal Kondo insulator. Furthermore, Fe5Si3 has also been demonstrated to exhibit giant magnetoresistance (GMR. The silicon-rich b-FeSi2 is a direct band gap material usable in light emitting diode (LED applications. Typically, these silicides are synthesized by traditional solid-state reactions or by ion beam-induced mixing (IBM of alternating metal and silicon layers. Alternatively, the utilization of organometallic compounds with reactive transition metal (Fe-carbon bonds has opened various routes for the preparation of these silicides and the silicon-stabilized bcc- and fcc-Fe phases contained in the Fe-Si binary phase diagram. The unique interfacial interactions of carbon with the Fe and Si components have resulted in the preferential formation of nanoscale versions of these materials. This review will discuss such reactions.

Hydrodynamic Modeling of Santa Marta's Big Marsh

International Nuclear Information System (INIS)

Saldarriaga, Juan

1991-01-01

The ecological degradation of Santa Marta's Big Marsh and their next areas it has motivated the realization of diagnosis studies and design by several state and private entities. One of the recommended efforts for international advisory it was to develop an ecological model that allowed the handling of the water body and the economic test of alternative of solution to those ecological problems. The first part of a model of this type is in turn a model that simulates the movement of the water inside the marsh, that is to say, a hydrodynamic model. The realization of this was taken charge to the civil engineering department, on the part of Colciencias. This article contains a general explanation of the hydrodynamic pattern that this being developed by a professors group. The ecological causes are described and antecedent, the parts that conform the complex of the Santa Marta big Marsh The marsh modeling is made and it is explained in qualitative form the model type Hydrodynamic used

Calibration of Linked Hydrodynamic and Water Quality Model for Santa Margarita Lagoon

Science.gov (United States)

2016-07-01

was used to drive the transport and water quality kinetics for the simulation of 2007–2009. The sand berm, which controlled the opening/closure of...TECHNICAL REPORT 3015 July 2016 Calibration of Linked Hydrodynamic and Water Quality Model for Santa Margarita Lagoon Final Report Pei...Linked Hydrodynamic and Water Quality Model for Santa Margarita Lagoon Final Report Pei-Fang Wang Chuck Katz Ripan Barua SSC Pacific James

Geomorphological evidences of Quaternary tectonic activities in the Santa Cruz river valley, Patagonia, Argentina

International Nuclear Information System (INIS)

Massabie, A.; Sanguinetti, A.; Nestiero, O.

2007-01-01

From Argentin lake, at west on Andean hills, to Puerto Santa Cruz on Atlantic coast, Santa Cruz river cross eastward Santa Cruz province over 250 km in Patagonia at southern Argentina. Present bed of the river has a meandering outline with first order meanders of great ratio bends and second order meanders of minor ratio bends. Principal wanderings are 45 to 55 km spaced from near Estancia La Julia or Rio Bote at west to Comandante Luis Piedrabuena at east. On river's bed middle sector these great curvatures are located at Estancia Condor Cliff and Estancia Rincon Grande. Regional and partial detailed studies allow to recognize structural control on river's bed sketch and valley s geomorphology that relates first order bends with reactivated principal faults. These faults fit well with parallel system of northwest strike of Austral Basin.On geological, geomorphologic and structural evidences recognized in Santa Cruz river, quaternary tectonic activity, related to Andean movements in southern Patagonian foreland, is postulated. (author)

Oxidation of Fe(II) in rainwater.

Science.gov (United States)

Willey, J D; Whitehead, R F; Kieber, R J; Hardison, D R

2005-04-15

Photochemically produced Fe(II) is oxidized within hours under environmentally realistic conditions in rainwater. The diurnal variation between photochemical production and reoxidation of Fe(II) observed in our laboratory accurately mimics the behavior of ferrous iron observed in field studies where the highest concentrations of dissolved Fe(ll) occur in afternoon rain during the period of maximum sunlight intensity followed by gradually decreasing concentrations eventually returning to early morning pre-light values. The experimental work presented here, along with the results of kinetics studies done by others, suggests thatthe primary process responsible for the decline in photochemically produced Fe(II) concentrations is oxidation by hydrogen peroxide. This reaction is first order with respect to both the concentrations of Fe(II) and H2O2. The second-order rate constant determined for six different authentic rain samples varied over an order of magnitude and was always less than or equal to the rate constant determined for this reaction in simple acidic solutions. Oxidation of photochemically produced ferrous iron by other oxidants including molecular oxygen, ozone, hydroxyl radical, hydroperoxyl/superoxide radical, and hexavalent chromium were found to be insignificant under the conditions present in rainwater. This study shows that Fe(II) occurs as at least two different chemical species in rain; photochemically produced Fe(II) that is oxidized over time periods of hours, and a background Fe(II) that is protected against oxidation, perhaps by organic complexation, and is stable against oxidation for days. Because the rate of oxidation of photochemically produced Fe(II) does not increase with increasing rainwater pH, the speciation of this more labile form of Fe(II) is also not controlled by simple hydrolysis reactions.

Santa Teresa y sus cartas, historia de los sentimientos

Directory of Open Access Journals (Sweden)

Egido, Teófanes

2015-12-01

Full Text Available Historical reflection on a peculiar dimension of St. Teresa of Jesus: the expression of her feelings in her writings, particularly in her abundant letters. The article focuses on the sense of humor, the joyfulness, and the importance of laughter in St. Teresa language, and also on the feeling of endearment with her family, with her order, with fray Juan de la Cruz. Ample space is dedicated to the tenderness towards girls in her convents. St. Teresa of Jesus appears as transgressor of 16th century social behaviours.Reflexión histórica sobre una dimensión peculiar de santa Teresa de Jesús: la expresión de sus sentimientos en sus escritos, de forma más especial en sus cartas abundantes. El artículo se centra en el sentido del humor, de la alegría, en la importancia de la risa en el lenguaje de santa Teresa y en el sentimiento de ternura con su familia, con su orden, con fray Juan de la Cruz. Se dedica un espacio amplio a la ternura hacia las niñas en sus conventos. Aparece santa Teresa de Jesús como trasgresora de los comportamientos sociales del siglo XVI.

Coupling of Nanocrystalline Anatase TiO2 to Porous Nanosized LaFeO3 for Efficient Visible-Light Photocatalytic Degradation of Pollutants

Directory of Open Access Journals (Sweden)

Muhammad Humayun

2016-01-01

Full Text Available In this work we have successfully fabricated nanocrystalline anatase TiO2/perovskite-type porous nanosized LaFeO3 (T/P-LFO nanocomposites using a simple wet chemical method. It is clearly demonstrated by means of atmosphere-controlled steady-state surface photovoltage spectroscopy (SPS responses, photoluminescence spectra, and fluorescence spectra related to the formed OH− radical amount that the photogenerated charge carriers in the resultant T/P-LFO nanocomposites with a proper mole ratio percentage of TiO2 display much higher separation in comparison to the P-LFO alone. This is highly responsible for the improved visible-light activities of T/P-LFO nanocomposites for photocatalytic degradation of gas-phase acetaldehyde and liquid-phase phenol. This work will provide a feasible route to synthesize visible-light responsive nano-photocatalysts for efficient solar energy utilization.

Considerations about Santa Catalina Formation northeast of Uruguay

International Nuclear Information System (INIS)

Keidel, J.

1984-01-01

A serial of land deposits placed in Santa Catharina south Brazil, and northeast of Uruguay. Most of them have been composed with a number of marine sediments, marshy region and swamp from upper paleozoic and low mesozoic.

Isotopic Evidence of Unaccounted for Fe and Cu Erythropoietic Pathways

Science.gov (United States)

Albarede, F.; Telouk, P.; Lamboux, A.; Jaouen, K.; Balter, V.

2011-12-01

Despite its potential importance for understanding perturbations in the Fe-Cu homeostatic pathways, the natural isotopic variability of these metals in the human body remains unexplored. We measured the Fe, Cu, and Zn isotope compositions of total blood, serum, and red blood cells of ~50 young blood donors by multiple-collector ICP-MS after separation and purification by anion exchange chromatography. Zn is on average 0.2 permil heavier in erythrocytes (δ 66Zn=0.44±0.33 permil) with respect to serum but shows much less overall isotopic variability than Fe and Cu, which indicates that isotope fractionation depends more on redox conditions than on ligand coordination. On average, Fe in erythrocytes (δ 56Fe=-2.59±0.47 permil) is isotopically light by 1-2 permil with respect to serum, whereas Cu in erythrocytes (δ 65Cu=0.56±0.50 permil) is 0.8 percent heavier. Fe and Cu isotope compositions clearly separate erythrocytes of men and women. Fe and Cu from B-type men erythrocytes are visibly more fractionated than all the other blood types. Isotope compositions provide an original method for evaluating metal mass balance and homeostasis. Natural isotope variability shows that the current models of Fe and Cu erythropoiesis, which assume that erythropoiesis is restricted to bone marrow, violate mass balance requirements. It unveils unsuspected major pathways for Fe, with erythropoietic production of isotopically heavy ferritin and hemosiderin, and for Cu, with isotopically light Cu being largely channeled into blood and lymphatic circulation rather than into superoxide dismutase-laden erythrocytes. Iron isotopes provide an intrinsic measuring rod of the erythropoietic yield, while Cu isotopes seem to gauge the relative activity of erythropoiesis and lymphatics.

Photocatalytic hydrogen production over solid solutions between BiFeO{sub 3} and SrTiO{sub 3}

Energy Technology Data Exchange (ETDEWEB)

Lu, Lingwei; Lv, Meilin [Shanghai Key Lab of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, 1239 Siping Road, Shanghai, 200092 (China); Liu, Gang [Shenyang National laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Science, 72 Wenhua Road, Shenyang 110016 (China); Xu, Xiaoxiang, E-mail: xxxu@tongji.edu.cn [Shanghai Key Lab of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, 1239 Siping Road, Shanghai, 200092 (China)

2017-01-01

Graphical abstract: We have successfully prepared a series of SrTiO{sub 3}-BiFeO{sub 3} solid solutions. These materials own strong visible light absorption and demonstrate appealing photocatalytic activity under both full range and visible light irradiation. - Highlights: • Band gap values can be tuned by adjusting molar ratios between SrTiO{sub 3} and BiFeO{sub 3}. • Photocatalytic activity is greatly improved after constituting solid solutions. • Photocatalytic activity is influenced by surface area and light absorption. • Fe plays an important role for band gap reduction and catalytic activity. - Abstract: Constituting solid solutions has been an appealing means to gain control over various physicochemical properties. In this work, we synthesized a series of SrTiO{sub 3}-BiFeO{sub 3} solid solutions and systematically explored their structural, optical and photocatalytic properties. Our results show that all solid solutions crystallize in a primitive cubic structure and their band gap values can be easily tuned by adjusting molar ratios between SrTiO{sub 3} and BiFeO{sub 3}. Photocatalytic hydrogen production under both full range and visible light irradiation is greatly improved after forming solid solutions. The highest hydrogen production rate obtained is ∼180 μmol/h under full range irradiation (λ ≥ 250 nm) and ∼4.2 μmol/h under visible light irradiation (λ ≥ 400 nm), corresponding to apparent quantum efficiency ∼2.28% and ∼0.10%, respectively. The activity is found to be strongly influenced by surface area and light absorption. Theoretical calculation suggests that Fe contributes to the formation of spin-polarized bands in the middle of original band gap and is responsible for the band gap reduction and visible light photocatalytic activity.

Natural gas utilization in Santa Cruz thermal-electric power; A utilizacao de gas natural em Santa Cruz

Energy Technology Data Exchange (ETDEWEB)

Azevedo, Mauricio F. de.; Lundeqvist, Carl G; Gomes, Gerson; Almeida, A E

1994-12-31

Use of natural gas as an alternative energy source on the thermo electric power plant of Santa Cruz are presented. Economic studies on hydroelectric power plants to use thermal generators during low water supply periods, costs of natural gas as a alternative energy fuel, and the engineer services to the conversion of fuel oil system, are discussed. 5 figs., 6 tabs.

Santa Lucia River basin. Development of water resources

International Nuclear Information System (INIS)

1970-01-01

The main objective of this study was to orient the development of water resources of the Santa Lucia River basin to maximum benefit in accordance with the priorities established by Government in relation to the National Development Plans

NEWS: Conference diary

Science.gov (United States)

2000-03-01

18 - 20 October 2000 Santa Fe, Argentina 5th Symposium of Investigators in Physics Education. Info: Ing Cristina Camara, GIDEAF Departamento de Fisica, Facultad de Ingenieria Quimica - UNL, Santiago del Estero 2829, 3000 Santa Fe, Argentina (ccamara@fiqus.unl.edu.ar or www.unl.edu.ar/sief5 )

Conservation efforts and possibilities for increased collaboration in the Santa Cruz River watershed

Science.gov (United States)

Claire A. Zugmeyer; Emily M. Brott

2013-01-01

Attendees of the annual Santa Cruz River Researchers’ Day meetings have identified a need to expand collaboration, partnership, and sharing of lessons learned across the watershed. To help guide this interest, Sonoran Institute organized a symposium on 2 May 2012 entitled “Santa Cruz River Conservation.” The symposium had simultaneous Spanish/English translation and...

Shelf evolution along a transpressive transform margin, Santa Barbara Channel, California

Science.gov (United States)

Johnson, Samuel Y.; Hartwell, Stephen; Sorlien, Christopher C.; Dartnell, Peter; Ritchie, Andrew C.

2017-01-01

High-resolution bathymetric and seismic reflection data provide new insights for understanding the post–Last Glacial Maximum (LGM, ca. 21 ka) evolution of the ∼120-km-long Santa Barbara shelf, located within a transpressive segment of the transform continental margin of western North America. The goal is to determine how rising sea level, sediment supply, and tectonics combine to control shelf geomorphology and history. Morpho­logic, stratigraphic, and structural data highlight regional variability and support division of the shelf into three domains. (1) The eastern Santa Barbara shelf is south of and in the hanging wall of the blind south-dipping Oak Ridge fault. The broad gently dipping shelf has a convex-upward shape resulting from thick post-LGM sediment (mean = 24.7 m) derived from the Santa Clara River. (2) The ∼5–8-km-wide Ventura Basin obliquely crosses the shelf and forms an asymmetric trough with thick post-LGM sediment fill (mean = 30.4 m) derived from the Santa Clara and Ventura Rivers. The basin is between and in the footwalls of the Oak Ridge fault to the south and the blind north-dipping Pitas Point fault to the north. (3) The central and western Santa Barbara shelf is located north of and in the hanging wall of the North Channel–Pitas Point fault system. The concave-up shape of the shelf results from folding, marine erosion, and the relative lack of post-LGM sediment cover (mean = 3.8 m). Sediment is derived from small steep coastal watersheds and largely stored in the Gaviota bar and other nearshore mouth bars. Three distinct upper slope morphologies result from a mix of progradation and submarine landsliding.Ages and rates of deformation are derived from a local sea-level-rise model that incorporates an inferred LGM shoreline angle and the LGM wave-cut platform. Post-LGM slip rates on the offshore Oak Ridge fault are a mini­mum of 0.7 ± 0.1 mm/yr. Slip rates on the Pitas Point fault system are a minimum of 2.3 ± 0.3 mm

The Upper Santa Ynez River as Habitat for a Diverse Riparian Flora and Fauna

Science.gov (United States)

M. Violet Gray; James M. Greaves; Thomas E. Olson

1989-01-01

The upper Santa Ynez River, Santa Barbara County, provides habitats for a relatively large population of least Bell's vireos (Vireo bellii pusillus), as well as diverse riparian flora and fauna. Of particular interest is the richness of the species within particular guilds. Four species of vireos: least Bell's, warbling (Vireo...

On the photofragmentation of Fe(CO)5

International Nuclear Information System (INIS)

De Paoli, M.-A.; Oliveira, S.M. de; Saitovitch, E.M.B.; Guenzburger, D.J.R.

1983-01-01

Pentacarbonyliron sorbed in low density polyethylene (LDPE) or polytetrafluorethylene (PTFE) and irradiated with ultraviolet light has been studied by infrared and Moessbauer spectroscopies. The main photofragment reacts with the residual pentacarbonyliron leading to the formation of Fe 2 (CO) 9 . This reaction, plus the information obtained from infrared and Moessbauer spectra, suggest that the new species could be assigned as tetracarbonyliron, Fe(CO) 4 , and tricarbonyliron Fe(CO) 3 . It is proved that molecules sorbed in a polymer matrix can be used as Moessbauer absorbers at low temperature. The polymer matrix allowed the isolation of otherwise unstable species: the high permeability of LDPE to gaseous carbon monoxide precludes the reformation of pentacarbonyliron molecules, thus excluding the 'cage effect' observed in frozen gas matrices. (Author) [pt

Automática de la línea La Moza – Santa Clara; Automatic of the line la Moza – Santa Clara

Directory of Open Access Journals (Sweden)

Marta Elena Bravo de las Casas

2015-09-01

Full Text Available La línea de 110 kV Santa Clara – La Moza, ubicada en medio de la línea de enlace entre la hidroeléctrica Robustiano León (Hanabanilla y la subestación Santa Clara 110 kV, es de gran importancia teniendo en cuenta que de la misma se obtiene la derivación de donde se alimenta la Subestación de 110/13,8 kV Gran Panel de nuevo tipo. La misma cuenta con un mecanismo de reenganche trifásico el cual no realiza de forma exitosa sus funciones, lo que trae afectaciones y dificultades a la hora de restablecer el sistema. En este trabajo se analizan las condiciones de operación de la región, así como la problemática de las automáticas instaladas proponiendo soluciones con el objetivo de lograr una operación eficaz ante las averías, sin que la hidroeléctrica Hanabanilla se pierda del Sistema Eléctrico Nacional y que no se pierda el suministro de energía eléctrica a la subestación Gran Panel.The 110 kV line Santa Clara –La Moza, which is located in the middle of the line of link between the hydroelectric Robustiano León (Hanabanilla and the substation Santa Clara 110 kV, is of great importance considering that of the same one obtains the derivation where new type Gran Panel Substation 110/13,8 feeds.Ithas athree-phasereclosingmechanismwhichdoes not performhis dutiessuccessfully, which brings affectationsanddifficultythe moment of restoringthe system. In this work, the operating conditions of the region are discussed, as well as the problem of the automatics installed, and is proposing solutions in order to ensure effective operation before faults, without that the Hanabanilla hydroelectric loses the syncrhronism with the Electrical National System and supply the substation Gran Panelis not lost.

Energy Balance of the Santa Catarina State - Series 1980 -1996; Balanco energetico do Estado de Santa Catarina - Serie 1980-1996

Energy Technology Data Exchange (ETDEWEB)

NONE

1997-07-01

This energy balance of the Santa Catarina State presents the following main topics that can be outstanding: economic aspects; supply and demand of energy by source 1980-1996; energy consumption by sector 1980/1996; energy interchange; and balance of the transformation centers 1980/1996.

Oxygen defects in Fe-substituted Tl-system superconductors

Institute of Scientific and Technical Information of China (English)

李阳; 曹国辉; 王耘波; 马庆珠; 熊小涛; 陈宁; 马如璋; 郭应焕; 许祝安; 王劲松; 张小俊; 焦正宽; 彭获田; 周思海

1996-01-01

For Fe-doped T1-1223 phase,the excess oxygen defects induced by Fe dopants are studied by means of Hall coefficient,thermogravimetric measurements,Mossbauer spectroscopy,and the model calculation of the effective bond valence.The extra oxygen defects have effects on carrier density and microstructure of the superconductors.In the light doping level of Fe (x=0-0.05),the superconducting transition and carrier density have significant corresponding relation--the zero resistance temperature Tco and carrier densities decrease linearly with Fe dopants increasing.The thermogravimetric measurements show that the Fe3+ ions’ substituting for Cu2+ ions can bring the extra oxygen into the lattice to form extra oxygen defects.The calculation of the effective bond valence shows that the decrease of carrier density originates the strongly localized binding of the extra oxygen defects.The distortion of Cu-O layer induced by the extra oxygen defects decreases the superconductive transition temperature.The microstructure

Preparation and photo-catalytic activities of FeOOH/ZnO/MMT composite

Energy Technology Data Exchange (ETDEWEB)

Zhou, Yao, E-mail: zy19830808@163.com [College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042 (China); Liu, Fusheng; Yu, Shitao [College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042 (China)

2015-11-15

Highlights: • The montmorillonite was used as the carrier for the synthesis of FeOOH nano-material and FeOOH/ZnO nano-material. • TEM was used to study the structure of the two nano-materials with the composite structure of goethite and wurtzite. • TEM was used to demonstrate FeOOH/ZnO nano-material can formed with the appropriate interface: wurtzite-(1 0 1)/(1 1 1)-goethite. • There were some coupling effect between FeOOH and ZnO, which can improve the photo-catalytic activities of FeOOH. • According to FTIR and TOC, PCP was degraded to aromatic ketone compounds and then to H{sub 2}O, CO{sub 2}, HCl. - Abstract: Montmorillonite (MMT) was used as the carrier for synthesis of FeOOH and FeOOH/ZnO nano-material. FeOOH and FeOOH/ZnO were synthesized by the aqueous solutions of Fe(NO{sub 3}){sub 3}–HNO{sub 3} and Zn(NO{sub 3}){sub 2}–NaOH/Fe(NO{sub 3}){sub 3}–HNO{sub 3} with the carrier of montmorillonite respectively. Transmission electron-microscopy (TEM) and X-ray diffraction (XRD) were used to study the morphology form and structure of the nano-materials. TEM was also used to demonstrate that FeOOH/ZnO can be formed with the appropriate interface. According to UV–vis absorption spectra, FeOOH/ZnO has a better response to visible light than FeOOH and ZnO, which indicates there is some coupling effect between FeOOH and ZnO. Pentachlorophenol (PCP) was used as a representative organic pollutant to evaluate the photo-catalytic efficiency of the FeOOH/ZnO and FeOOH catalysts in visible light (λ > 400 nm). The photo-catalytic efficiency of FeOOH/ZnO/MMT is better than FeOOH/MMT. According to FTIR, changes of pH and TOC, the degradation mechanism was also discussed. PCP was degraded to aromatic ketone and chloro-hydrocarbon compounds and then to H{sub 2}O, CO{sub 2} and HCl.

Conferences, workshops, trainings

Science.gov (United States)

Goals Recycling Green Purchasing Pollution Prevention Reusing Water Resources Environmental Management . Mar 1 Wed 8:00 AM Cosmic Rays, Pulsar Nebulae and Dark Matter La Fonda Hotel, Santa Fe, NM The purpose Quantum Matter La Fonda Hotel - 100 East San Francisco Street, Santa Fe, NM The purpose of this workshop

76 FR 15994 - Notice of Filing of plats of survey, New Mexico

Science.gov (United States)

2011-03-22

... of plats of survey, New Mexico AGENCY: Bureau of Land Management, Interior. ACTION: Notice of filing... in the New Mexico State Office, Bureau of Land Management, Santa Fe, New Mexico, thirty (30) calendar... for inspection in the New Mexico State Office, Bureau of Land Management, 301 Dinosaur Trail, Santa Fe...

76 FR 4372 - Notice of Filing of Plats of Survey, New Mexico

Science.gov (United States)

2011-01-25

... of Plats of Survey, New Mexico AGENCY: Bureau of Land Management, Interior. ACTION: Notice of filing... in the New Mexico State Office, Bureau of Land Management, Santa Fe, New Mexico, thirty (30) calendar... for inspection in the New Mexico State Office, Bureau of Land Management, 301 Dinosaur Trail, Santa Fe...

Fluorescence x-ray absorption fine structure studies of Fe-Ni-S and Fe-Ni-Si melts to 1600 K

Science.gov (United States)

Manghnani, M. H.; Hong, X.; Balogh, J.; Amulele, G.; Sekar, M.; Newville, M.

2008-04-01

We report NiK -edge fluorescence x-ray absorption fine structure spectra (XAFS) for Fe0.75Ni0.05S0.20 and Fe0.75Ni0.05Si0.20 ternary alloys from room temperature up to 1600 K. A high-temperature furnace designed for these studies incorporates two x-ray transparent windows and enables both a vertical orientation of the molten sample and a wide opening angle, so that XAFS can be measured in the fluorescence mode with a detector at 90° with respect to the incident x-ray beam. An analysis of the Ni XAFS data for these two alloys indicates different local structural environments for Ni in Fe0.75Ni0.05S0.20 and Fe0.75Ni0.05Si0.20 melts, with more Ni-Si coordination than Ni-S coordination persisting from room temperature through melting. These results suggest that light elements such as S and Si may impact the structural and chemical properties of Fe-Ni alloys with a composition similar to the earth’s core.

Santa Barbara, California Tsunami Forecast Grids for MOST Model

Data.gov (United States)

National Oceanic and Atmospheric Administration, Department of Commerce — The Santa Barbara, California Forecast Model Grids provides bathymetric data strictly for tsunami inundation modeling with the Method of Splitting Tsunami (MOST)...

Novel multifunctional NiFe_2O_4/ZnO hybrids for dye removal by adsorption, photocatalysis and magnetic separation

International Nuclear Information System (INIS)

Zhu, Hua-Yue; Jiang, Ru; Fu, Yong-Qian; Li, Rong-Rong; Yao, Jun; Jiang, Sheng-Tao

2016-01-01

Graphical abstract: - Highlights: • The NiFe_2O_4 was decorated on ZnO surface by a hydrothermal method. • NiFe_2O_4/ZnO hybrids show high adsorption capacity and excellent photostability. • The main active species in dye decolorization by NiFe_2O_4/ZnO hybrids are ·OH and h"+. • NiFe_2O_4/ZnO hybrids can be easily separated by an external magnet. - Abstract: Novel multifunctional NiFe_2O_4/ZnO hybrids were prepared by a hydrothermal method and their physicochemical properties were characterized by XRD, SEM, TEM, TGA, VSM, BET and UV–vis DRS. The adsorption and photocatalytic performance of NiFe_2O_4/ZnO hybrids were systematically investigated using congo red as a model contaminant. With the introduction of NiFe_2O_4, NiFe_2O_4/ZnO hybrids can absorb the whole light from 300 nm to 700 nm. The adsorption capacity (221.73 mg g"−"1) of NiFe_2O_4/ZnO hybrids is higher than those of NiFe_2O_4, ZnO and mechanically mixed NiFe_2O_4/ZnO hybrids. The removal of congo red solution (20 mg L"−"1) by NiFe_2O_4/ZnO hybrids was about 94.55% under simulated solar light irradiation for 10 min. ·OH and h"+ play important roles in the decolorization of congo red solution by NiFe_2O_4/ZnO hybrids under simulated solar light irradiation. The decolorization efficiency of congo red solution is 97.23% for the fifth time by NiFe_2O_4/ZnO hybrids under simulate solar light irradiation, indicating the high photostability and durability. NO_3"− and Cl"− anions which are ubiquitous components in dye-containing wastewater have negligible influence on the effectiveness of NiFe_2O_4/ZnO hybrids. Moreover, the magnetic NiFe_2O_4/ZnO hybrids can be easily separated from the reacted solution by an external magnet.

Pengaruh Kepemimpinan Situasional terhadap Semangat Kerja Perawat Rumah Sakit Santa Maria Pekanbaru

OpenAIRE

Sutrisna, Endang; Anggrenni, Dian Prapty

2015-01-01

This research aims to find the implications of leadership on keep spirit of nurses in Santa Maria Hospital Pekanbaru. Leadership as an independent variable (X) consist of leadership telling, selling, participating, and delegating. And keep spirit as the dependent variable (Y) cosist pf salary, incentive and allowance and improvement of welfare.The research used sample of the nurses in Santa Maria Pekanbaru. The number of this sample is 67 persons with slovin. This research is also used Strati...

HRGC-MS analysis of terpenoids from Maytenus ilicifolia and Maytenus aquifolium ("espinheira santa"

Directory of Open Access Journals (Sweden)

Cordeiro Paulo J. M.

1999-01-01

Full Text Available This work describes the identification of some of the minor chemical constituents of "espinheira santa" (Maytenus ilicifolia and Maytenus aquifolium, Celastraceae, a medicinal plant widely utilized in Brazil. By using high resolution gas chromatography coupled to mass spectrometry (HRGC-MS, it was possible to identify mainly triterpenoids and steroids in "espinheira santa", most of them reported for the first time in both Maytenus species.

Globular Cluster Abundances from High-resolution, Integrated-light Spectroscopy. IV. The Large Magellanic Cloud: α, Fe-peak, Light, and Heavy Elements

Science.gov (United States)

Colucci, Janet E.; Bernstein, Rebecca A.; Cameron, Scott A.; McWilliam, Andrew

2012-02-01

We present detailed chemical abundances in eight clusters in the Large Magellanic Cloud (LMC). We measure abundances of 22 elements for clusters spanning a range in age of 0.05-12 Gyr, providing a comprehensive picture of the chemical enrichment and star formation history of the LMC. The abundances were obtained from individual absorption lines using a new method for analysis of high-resolution (R ~ 25,000), integrated-light (IL) spectra of star clusters. This method was developed and presented in Papers I, II, and III of this series. In this paper, we develop an additional IL χ2-minimization spectral synthesis technique to facilitate measurement of weak (~15 mÅ) spectral lines and abundances in low signal-to-noise ratio data (S/N ~ 30). Additionally, we supplement the IL abundance measurements with detailed abundances that we measure for individual stars in the youngest clusters (age +0.5) and increases with decreasing age, indicating a strong contribution of low-metallicity asymptotic giant branch star ejecta to the interstellar medium throughout the later history of the LMC. We also find a correlation of IL Na and Al abundances with cluster mass in the sense that more massive, older clusters are enriched in the light elements Na and Al with respect to Fe, which implies that these clusters harbor star-to-star abundance variations as is common in the MW. Lower mass, intermediate-age, and young clusters have Na and Al abundances that are lower and more consistent with LMC field stars. Our results can be used to constrain both future chemical evolution models for the LMC and theories of globular cluster formation. This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.

Modernization projects in Santa Maria e Garona; Proyectos de modernizacion en Santa Maria de Garona

Energy Technology Data Exchange (ETDEWEB)

Marcos, R.; Alutiz, J. I.; Garcia Sanchez, M.

2011-07-01

This article shows a vision of the Santa Maria de Garona power Plant modernization guidelines and it also presents the most significant projects deployed in the last decade at the power plant grouped in mechanics projects, electrical projects, instrumentations projects and IT projects. At the same time three projects are explained in more detail: the change of one of the main transformers, the evolution from paper recorders to paperless video graphic recorders and the new plant data information system. (Author)

Compression of Fe-Si-H alloys

Science.gov (United States)

Tagawa, S.; Ohta, K.; Hirose, K.

2014-12-01

The light elements in the Earth's core have not been fully identified yet, but hydrogen is now collecting more attention in part because recent planet formation theory suggests that large amount of water should have been brought to the Earth during its formation (giant-impact stage). Nevertheless, the effect of hydrogen on the property of iron alloys is little known so far. The earlier experimental study by Hirao et al. [2004 GRL] examined the compression behavior of dhcp FeHx (x ≈ 1) and found that it becomes much stiffer than pure iron above 50 GPa, where magnetization disappears. Here we examined the solubility of hydrogen into iron-rich Fe-Si alloys and the compression behavior of dhcp Fe-Si-H alloy at room temperature. Fe+6.5wt.%Si or Fe+9wt.%Si foil was loaded into a diamond-anvil cell (DAC), and then liquid hydrogen was introduced at temperatures below 20 K. X-ray diffraction measurements at SPring-8 revealed the formation of a dhcp phase with or without thermal annealing by laser above 8.4 GPa. The concentration of hydrogen in such dhcp lattice was calculated following the formula reported by Fukai [1992]; y = 0.5 and 0.2 for Fe-6.5wt.%Si-H or Fe-9wt.%Si-H alloys, respectively when y is defined as Fe(1-x)SixHy. Unlike Fe-H alloy, hydrogen didn't fully occupy the octahedral sites even under hydrogen-saturated conditions in the case of Fe-Si-H system. Anomaly was observed in obtained pressure-volume curve around 44 Å3 of unit-cell volume for both Fe-6.5wt.%Si-H and Fe-9wt.%Si-H alloys, which may be related to the spin transition in the dhcp phase. They became slightly stiffer at higher pressures, but their compressibility was still similar to that of pure iron.

76 FR 28222 - Extension of the Public Review and Comment Period and Announcement of an Additional Public...

Science.gov (United States)

2011-05-16

... Independence Avenue, SW., Washington, DC 20585, or telephone 202-586-9438. For general information concerning... (GC-54), U.S. Department of Energy, 1000 Independence Avenue, SW., Washington, DC 20585; (202) 586..., at 5 p.m. to 9 p.m., Santa Fe Community College, Jemez Rooms, 6401 Richards Avenue, Santa Fe, NM. The...

77 FR 3607 - Drawbridge Operation Regulation; Willamette River, Portland, OR

Science.gov (United States)

2012-01-25

... deviation from the regulation governing the operation of the Burlington Northern Santa Fe Railway Bridge... Northern Santa Fe (BNSF) Railway has requested to not open the BNSF Railroad Lift Bridge for vessels to... deviation allows the lift span of the BNSF Railway Bridge across the Willamette River, mile 6.9, to remain...

Photocatalytic removal of tetrabromobisphenol A by magnetically separable flower-like BiOBr/BiOI/Fe{sub 3}O{sub 4} hybrid nanocomposites under visible-light irradiation

Energy Technology Data Exchange (ETDEWEB)

Gao, Shengwang [Department of Chemistry, College of Science, North University of China, Taiyuan 030051 (China); State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012 (China); Guo, Changsheng; Hou, Song; Wan, Li [State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012 (China); Wang, Qiang [Heilongjiang Research Academy of Environmental Sciences, Harbin 150056 (China); Lv, Jiapei; Zhang, Yuan [State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012 (China); Gao, Jianfeng [Department of Chemistry, College of Science, North University of China, Taiyuan 030051 (China); Meng, Wei [State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012 (China); Xu, Jian, E-mail: xujian@craes.org.cn [State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012 (China)

2017-06-05

Highlights: • A novel BiOBr/BiOI/Fe{sub 3}O{sub 4} hybrid nanocomposites was prepared for the first time. • BiOBr-BiOI-Fe{sub 3}O{sub 4} (2:2:0.5) displays superior photocatalytic activity for TBBPA. • Good magnetic property makes it easy for the material’s recovery from solution. • The photocatalytic reaction mechanism of BiOBr/BiOI/Fe{sub 3}O{sub 4} was proposed. • Superoxide radical is the dominant ROS in TBBPA degradation. - Abstract: A novel flower-like three-dimensional BiOBr/BiOI/Fe{sub 3}O{sub 4} heterojunction photocatalyst was synthesized using a simple in situ co-precipitation method at room temperature. The hybrid composites were characterized by a couple of techniques including X-ray powder diffraction, scanning electron microscope, transmission electron microscopy, ultraviolet-visible diffuse reflection spectroscopy, Brunauer-Emmett-Teller, X-ray photo-electron spectroscopy, photoluminescence technique, and vibrating sample magnetometer. Fe{sub 3}O{sub 4} nanoparticles were perfectly loaded on the surface of BiOBr/BiOI microspheres. The recyclable magnetic BiOBr/BiOI/Fe{sub 3}O{sub 4} was employed to degrade TBBPA under visible light irradiation. The optimal removal efficiency of the ternary BiOBr/BiOI/Fe{sub 3}O{sub 4} (2:2:0.5) nanocomposite reached up to 98.5% for TBBPA in aqueous solution. The superior photocatalytic activity of BiOBr/BiOI/Fe{sub 3}O{sub 4} was mainly ascribed to large surface area and appropriate energy gaps, resulting in the effective adsorption and separation of electrons-hole pairs. The photogenerated reactive species determined by free radicals trapping experiments revealed that the excellent catalytic activity was primarily driven by ·O{sub 2}{sup −} radical. The photocatalytic degradation kinetics and a detailed mechanism were also proposed. Result demonstrated that the BiOBr/BiOI/Fe{sub 3}O{sub 4} can be magnetically recycled, and maintain high photocatalytic activity after reuse over five cycles. It

Performance of 'Rocha' and 'Santa Maria' pears as affected by planting density

Directory of Open Access Journals (Sweden)

Mateus da Silveira Pasa

2015-02-01

Full Text Available The objective of this work was to evaluate the performance of 'Rocha' and 'Santa Maria' pears at two planting densities. The experiment was carried out during the 2011/2012, 2012/2013, and 2013/2014 growing seasons, in one-year-old orchards (2011/2012 of 'Rocha' and 'Santa Maria' pears, trained in a central-leader system and planted in two densities (2,000 and 4,000 trees per hectare. The assessed parameters were: production per hectare, production per tree, yield efficiency, number of fruit per tree, average fruit weight, trunk diameter increment, fruit firmness, and soluble solid contents. The cumulative yield of 'Rocha' is greater at the higher planting density, whereas the yield efficiency of 'Santa Maria' increases at the lower planting density, as the trees get more mature. Trunk diameter of 'Rocha' also increases at the lower planting density. However, fruit quality parameters in both cultivars are little affected by planting density.

Professional literature production and information science education in Santa Catarina State, BrazilProdução de literatura profissional e educação em informação documentária no estado de Santa Catarina

Directory of Open Access Journals (Sweden)

Francisca Rasche

1999-09-01

Full Text Available This is a analysis about the professional literature production at library and information science in Santa Catarina State, Brazil, from 1973 to 1990 and its insertion on the professional education curriculum of the undergraduated library and information science schools of the UFSC [Universidade Federal de Santa Catarina] and UDESC [Universidade do Estado de Santa Catarina], from 1973 to 1993. The tables and graphics present a low insertion of this literature on the curriculum.Análise de pesquisa acerca da produção de literatura por profissionais da informação documentária em Santa Catarina e de sua inserção nos programas e planos de ensino dos cursos de Biblioteconomia da Universidade Federal de Santa Catarina – UFSC – e Universidade do Estado de Santa Catarina – UDESC. Para a análise foram construídas duas bases de dados; a primeira refere-se à identificação da produção no período de 1973 a 1990 e a segunda refere-se à identificação da literatura citada nos programas e planos e ensino de Biblioteconomia das duas Universidades. Os resultados indicam baixa inserção da produção local, de 1973 a 1990, nos programas e planos de ensino ministrados de 1973 a 1993, apontando para um processo educacional reprodutivista e desestimulador da produção escrita.

O Difícil Equilíbrio entre Descentralização, Desenvolvimento e Participação: o Caso dos Conselhos de Desenvolvimento Regional no Estado de Santa Catarina

Directory of Open Access Journals (Sweden)

Késya Margarida Hack

2010-01-01

Full Text Available This article discusses the process of participation in the decentralization that has occurred in the state of Santa Catarina, since 2003, and on its relationship with regional development. The overall objective was to study the profile of counselors of Regional Development Council (RDC of Joaçaba to raise possibilities for training of members of RDC, and can extrapolate, then, the knowledge acquired for comparison with other councils existing counterparts in Santa Catarina. The research used a lot of methods such as participant observation, reading and analyzing documents from the RDC study, interviews, questionnaires and literature research. The data were analyzed in the light of literature and empirical reality experienced in participation in the activities of RDC. From the research was established a proposal for training, that was validated by the Regional Development Council of Joaçaba. With regard to results, the research indicates the need for systematic and continuing investments in the development of both the advisers as the very process of decentralization in Santa Catarina, designed to promote and realize a regional development project which in fact assists in intensive participation and accountability of civil society.

Análise de distribuição de chuva para Santa Maria, RS Analysis of rainfall distribution for Santa Maria, RS, Brazil

Directory of Open Access Journals (Sweden)

Joel C. da Silva

2007-02-01

Full Text Available O estudo em pauta teve como objetivo analisar a distribuição da quantidade diária de precipitação e do número de dias com chuva e determinar a variação da probabilidade de ocorrência de precipitação diária, durante os meses do ano, em Santa Maria, RS. Os dados de precipitação utilizados foram obtidos durante 36 anos de observação, na Estação Climatológica do 8º Distrito de Meteorologia, localizada na Universidade Federal de Santa Maria (29º 43' 23" de latitude Sul e 53º 43' 15" de longitude Oeste, altitude 95 m. Analisaram-se as seguintes funções de distribuição de probabilidade: gama, Weibull, normal, log-normal e exponencial. As funções que melhor descreveram a distribuição das probabilidades foram gama e Weibull. O maior número de dias com chuva ocorreu durante os meses de inverno porém o volume de precipitação é menor nesses dias, resultando em total mensal semelhante para todos os meses do ano.The objectives of this study were to analyze the distribution of total daily rainfall data and the number of rainy-days, and to determine the probability variation of daily precipitation during the months of the year in Santa Maria, Rio Grande do Sul State, Brazil. A 36-year rainfall database measured at the Climatological Station of 8th District of Meteorology, located in Santa Maria Federal University (29º 43' 23" S and 53º 43' 15" W were used in the study. The following probability distribution functions were tested: gamma, Weibull, normal, lognormal and exponential. The functions that best described the frequency distribution were gamma and Weibull. There were more number of rainy days in the winter, but with less amount of rainfall, resulting in similar monthly total precipitation for the twelve months of the year.

Santa Barbara Final Technical Report

Energy Technology Data Exchange (ETDEWEB)

Hacker, Angela; Hansen, Sherman; Watkins, Ashley

2013-11-30

This report serves as the Final Report for Santa Barbara County’s Energy Efficiency and Conservation Block Grant (EECBG) BetterBuildings Neighborhood Program (BBNP) award from the U.S. Department of Energy (DOE). This report explains how DOE BBNP funding was invested to develop robust program infrastructure designed to help property owners complete energy improvements, thereby generating substantial outcomes for the local environment and economy. It provides an overview of program development and design within the grant period, program accomplishments and challenges to date, and a plan for the future sustainability of emPower, the County’s innovative clean energy and building efficiency program. During the grant period, Santa Barbara County’s emPower program primarily targeted 32,000 owner occupied, single family, detached residential homes over 25 years old within the County. In order to help these homeowners and their contractors overcome market barriers to completing residential energy improvements, the program developed and promoted six voluntary, market-based service areas: 1) low cost residential financing (loan loss reserve with two local credit unions), 2) residential rebates, 3) local customer service, 4) expert energy advising, 5) workforce development and training, and 6) marketing, education and outreach. The main goals of the program were to lower building energy use, create jobs and develop a lasting regional building performance market. These services have generated important early outcomes and lessons after the program’s first two years in service. The DOE BBNP funding was extended through October 2014 to enable Santa Barbara County to generate continued outcomes. In fact, funding related to residential financing remains wholly available for the foreseeable future to continue offering Home Upgrade Loans to approximately 1,300 homeowners. The County’s investment of DOE BBNP funding was used to build a lasting, effective, and innovative

Impact of influenza in the post-pandemic phase: Clinical features in hospitalized patients with influenza A (H1N1) pdm09 and H3N2 viruses, during 2013 in Santa Fe, Argentina.

Science.gov (United States)

Kusznierz, Gabriela; Carolina, Cudós; Manuel, Rudi Juan; Sergio, Lejona; Lucila, Ortellao; Julio, Befani; Mirta, Villani; Pedro, Morana; Graciana, Morera; Andrea, Uboldi; Elsa, Zerbini

2017-07-01

It is important to characterize the clinical and epidemiological pattern of the influenza A (H1N1) pdm09 virus and compare it with influenza A (H3N2) virus, as surveyed in just a few studies, in order to contribute to the implementation and strengthening of influenza control and prevention strategies. The aims in this study were to describe influenza clinical and epidemiological characteristics in hospitalized patients, caused by influenza A (H1N1)pdm09 and influenza A (H3N2) viruses during 2013, in Santa Fe, Argentina. A retrospective study was conducted over 2013 among hospitalized patients with laboratory-confirmed influenza diagnosis. In contrast to patients with influenza A (H3N2) (20.5%), a higher proportion of hospitalizations associated with influenza H1N1pdm were reported among adults aged 35-65 years (42.8%). Of all patients, 73.6% had an underlying medical condition. Hospitalized patients with H1N1pdm were subject to 2.6 (95%CI, 1.0-6.8) times higher risk of severity, than those hospitalized with influenza A (H3N2). This results demonstrate the impact in the post-pandemic era of H1N1pdm virus, with increased risk of severe disease, in relation to H3N2 virus, both viruses co-circulating during 2013. © 2017 Wiley Periodicals, Inc.

Hierarchically multifunctional K-OMS-2/TiO2/Fe3O4 heterojunctions for the photocatalytic oxidation of humic acid under solar light irradiation.

Science.gov (United States)

Zhang, Tong; Yan, Xiaoli; Sun, Darren Delai

2012-12-01

A multifunctional heterojunctioned K-OMS-2/TiO(2)/Fe(3)O(4) (KTF) nanocomposite was successfully synthesized using a combination of hydrothermal and co-precipitation techniques. The resultant sample was characterized by XRD, FESEM, TEM, N(2) adsorption, XPS and VSM. Its photocatalytic activity was demonstrated in the photocatalytic degradation of humic acid (HA). Morphology characterization showed the hierarchical structure of the synthesized material, and XRD results revealed that both the rutile and anatase TiO(2) structures are present in the sample. The average pore diameters and BET surface area of the synthesized KTF heterojunctions were 40 nm and 134.42 m(2)/g, respectively. XPS spectra confirmed the presence of Fe(3)O(4) and TiO(2) in the synthesized material, and the valences of Mn were kept at +3 and +4 after the grafting of Fe(3)O(4) and TiO(2). The synthesized material showed good magnetic response and photocatalytic activity under simulated solar light irradiation, and 85.7% of HA was decomposed after 120 min in the presence of KTF nanocomposites. The reusability study suggested that the magnetic recovered material was stable enough for multiple recycling usages, verifying its potential application in water purification. Copyright © 2012 Elsevier B.V. All rights reserved.

Noteworthy bird records at Lagoa Santa, southeastern Brazil Registros notáveis de aves em Lagoa Santa, sudeste do Brasil

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Marcos Rodrigues

2008-03-01

Full Text Available Lagoa Santa, a small town in southeastern Brazil where naturalist Peter Lund lived, is regarded nowadays as an important historical site for the biological sciences. From 1847 to 1855, J.T. Reinhardt, hosted by Lund, collected 343 bird species. This material is an outstanding reference for many modern ornithological studies. The present paper reports the occurrence of some rare and threatened birds for the region of Lagoa Santa between 1998 and 2005. In this account I list the Rusty-margined Guan Penelope superciliaris Temminck, 1815; the Roseate Spoonbill Platalea ajaja Linnaeus, 1758; the Maguari Stork Ciconia maguari (Gmelin, 1789; the Wood Stork Mycteria americana Linnaeus, 1758; the Black Hawk-eagle Spizaetus tyrannus (Wied, 1820 and the Turquoise-fronted Parrot Amazona aestiva (Linnaeus, 1758. It is also reported the southernmost record for the Blue-and-yellow Macaw Ara ararauna (Linnaeus, 1758 and the range extension of the Crowned Slaty flycatcher Griseotyrannus aurantioatrocristatus (d'Orbigny and Lafresnaye, 1837. These data can be used as a baseline for studies of colonization and extinction.Lagoa Santa, cidade onde viveu Peter Lund é um dos sítios de maior importância histórica para as ciências biológicas. Durante os anos de 1847 e 1855, J.T. Reinhardt, a convite de Lund, coletou 343 espécies de aves que são hoje referência para vários estudos ornitológicos. O presente artigo relata a ocorrência de algumas aves raras e/ou ameaçadas para a região de Lagoa Santa, entre 1998 e 2005. A lista de espécies inclui a jacupemba Penelope superciliaris Temminck, 1815, o colhereiro Platalea ajaja Linnaeus, 1758, a maguari Ciconia maguari (Gmelin, 1789, a cabeça-seca Mycteria americana Linnaeus, 1758, o gavião-pega-macaco Spizaetus tyrannus (Wied, 1820; e o papagaio-verdadeiro Amazona aestiva (Linnaeus, 1758. Relata-se também a ocorrência mais meridional da arara-canindé Ara ararauna (Linnaeus, 1758, e a expansão da distribui

Moessbauer and magnetic investigation of Fe-Mn alloy

International Nuclear Information System (INIS)

Yousif, A.A.

1994-01-01

Moessbauer, X-ray, magnetization and susceptibility measurements were performed to study Fe 100-x Mn x , x = 5, 15, 39, 50. The different phases of Fe-Mn were identified, and hyperfine interaction parameters and average magnetic moments of some samples were determined. The average hyperfine field and average magnetic moment decrease as x increases. The influence of the Mn neighbourhood on the derived parameters is discussed in the light of calculations using the first principle discrete variational method in the local density approximation. (orig.)

Field-trip guide to the geology of the Lexington Reservoir and Loma Prieta areas in the Santa Cruz Mountains, Santa Clara and Santa Cruz counties, California

Science.gov (United States)

Stoffer, Philip W.; Messina, Paula

2002-01-01

This guide contains a road log and five stop descriptions for a field trip in the southern Santa Cruz Mountains. The trip officially begins at the boat dock parking area on Alma Bridge Road near the dam of Lexington Reservoir. Stop 1 involves a walk up the Limekiln Trail to examine a large landslide in serpentinite that frequently takes out the trail. Stop 2 is at Miller Point picnic area along the shore of the reservoir where exposures of massive, fractured graywacke sandstone are capped with terrace gravel deposits. Stop 3 is along Highland Way in the Santa Cruz Mountains where large landslides have occasionally force the closure of the road. Stop 4A-C are several closely spaced outcrop areas along Loma Prieta Avenue and Summit-Mt. Madonna Road in the Loma Prieta summit area. A walk to scenic vista points provide opportunity to discuss the evolution of regional landscape along the crest of the Sierra Azul. In addition, a variety of rock types are exposed in the Stop 4 area along a series of road cuts, including Cretaceous age conglomerate, turbidites (consisting of interbedded sandstone and shale), and fossiliferous mudstone. Stop 5 involves returning to the boat dock parking area to examine geology and the placement of the Lexington Dam in the Los Gatos Creek canyon.

Prácticas de policía: apuntes para una arqueología de la educación en Santafé colonial

Directory of Open Access Journals (Sweden)

Sandra Patricia Rodríguez Ávila

2004-12-01

Full Text Available This article analyzes the general rulings group contained in police court orders and edicts to show the configuration of two educational strategies into Santa Fe city by the end of the 18th century: the appropriation of urban ruling practices, and the collection of homeless, idle and vague people as producers of public disorders. On these people the Royal Hospice of Santa Fe tried to force a new moral modeling by means of their reclusion and forcing to work.//Este artículo analiza algunas reglamentaciones contenidas en autos o bandos de policía para mostrar la configura¬ción de dos estrategias educativas en la ciudad de Santa Fe a finales del siglo XVIII: la incorporación de prácticas de regulación urbana y la recolección de mendigos, ociosos y malentretenidos causantes de desórdenes públicos, sobre quienes se buscó ejercer un nuevo tipo de ortopedia moral mediante su reclusión y aplicación al trabajo en el Real Hospicio de Santa Fe.

Facile synthesis and characterization of ZnFe{sub 2}O{sub 4}/{alpha}-Fe{sub 2}O{sub 3} composite hollow nanospheres

Energy Technology Data Exchange (ETDEWEB)

Shen, Yu [Key Laboratory of Industrial Ecology and Environmental Engineering and State Key Laboratory of Fine Chemical, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024 (China); School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028 (China); Li, Xinyong, E-mail: xyli@dlut.edu.cn [Key Laboratory of Industrial Ecology and Environmental Engineering and State Key Laboratory of Fine Chemical, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024 (China); Department of Chemical Engineering, Curtin University, Perth, WA 6845 (Australia); Zhao, Qidong; Hou, Yang [Key Laboratory of Industrial Ecology and Environmental Engineering and State Key Laboratory of Fine Chemical, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024 (China); Tade, Moses [Department of Chemical Engineering, Curtin University, Perth, WA 6845 (Australia); Liu, Shaomin, E-mail: Shaomin.Liu@curtin.edu.au [Department of Chemical Engineering, Curtin University, Perth, WA 6845 (Australia)

2011-12-15

Highlights: Black-Right-Pointing-Pointer ZnFe{sub 2}O{sub 4}/{alpha}-Fe{sub 2}O{sub 3} composite hollow nanospheres were successfully synthesized via a facile method. Black-Right-Pointing-Pointer Detailed structural, morphology and the phase composition were studied. Black-Right-Pointing-Pointer The incorporation of ZnFe{sub 2}O{sub 4} and {alpha}-Fe{sub 2}O{sub 3} gives an appropriate band gap value to utilize solar energy. -- Abstract: ZnFe{sub 2}O{sub 4}/{alpha}-Fe{sub 2}O{sub 3} composite hollow nanospheres were successfully fabricated via a facile one-pot solvothermal method, utilizing polyethylene glycol as soft template. X-ray diffraction and scanning electron microscopy analysis revealed that the prepared nanospheres with cubic spinel and rhombohedra composite structure had a uniform diameter of about 370 nm, and the hollow structure could be further confirmed by transmission electron microscopy. Energy dispersive X-ray, X-ray photoelectron spectroscopy and Fourier transform infrared techniques were also applied to characterize the elemental composition and chemical bonds in the hollow nanospheres. The ZnFe{sub 2}O{sub 4}/{alpha}-Fe{sub 2}O{sub 3} composite hollow nanospheres show attractive light absorption property for potential applications in electronics, optics, and catalysis.

Preparation and biodistribution of {sup 59}Fe-radiolabelled iron oxide nanoparticles

Energy Technology Data Exchange (ETDEWEB)

Pospisilova, Martina, E-mail: martinapospisilova@gmail.com; Zapotocky, Vojtech; Nesporova, Kristina [Contipro a.s (Czech Republic); Laznicek, Milan; Laznickova, Alice [Charles University, Faculty of Pharmacy in Hradec Králové (Czech Republic); Zidek, Ondrej; Cepa, Martin; Vagnerova, Hana; Velebny, Vladimir [Contipro a.s (Czech Republic)

2017-02-15

We report on the {sup 59}Fe radiolabelling of iron oxide nanoparticle cores through post-synthetic isotope exchange ({sup 59}Fe-IONP{sub ex}) and precursor labelling ({sup 59}Fe-IONP{sub pre}). Scanning electron microscopy and dynamic light scattering measurements showed no impact of radiolabelling on nanoparticle size or morphology. While incorporation efficiencies of these methods are comparable—83 and 90% for precursor labelling and post-synthetic isotope exchange, respectively—{sup 59}Fe-IONP{sub pre} exhibited much higher radiochemical stability in citrated human plasma. Quantitative ex vivo biodistribution study of {sup 59}Fe-IONP{sub pre} coated with triethylene glycol was performed in Wistar rats. Following the intravenous administration, high {sup 59}Fe concentration was observed in the lung and the organs of the reticuloendothelial system such as the liver, the spleen and the femur.

Potencial de cultivo da macroalga Kappaphycus alvarezii no litoral de Santa Catarina

OpenAIRE

Santos, Alex Alves dos

2014-01-01

Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Ciências Agrárias, Programa de Pós-Graduação em Aqüicultura, Florianópolis, 2014. Os cultivos da macroalga K. alvarezii em monocultivo ou integrados com moluscos (Crassostrea gigas e Perna perna) podem proporcionar benefícios ambientais e econômicos. Este trabalho avaliou o potencial de cultivo da macroalga Kappaphycus alvarezii no parque aquícola de Santa Catarina. O primeiro trabalho identificou a capacidade do parque e...

Biocalcarenites as construction materials in Santa Marina de Aguas Santas Church at Cordoba, Spain

Directory of Open Access Journals (Sweden)

Meroño, J. E.

2009-03-01

Full Text Available This study consisted in characterizing the materials used to build Santa Marina de Aguas Santas Church at Cordoba and locating the original quarries. The techniques used in the lithological and chemical characterization included XRD, petrographic microscopy and electron dispersive scanning microscopy. The chemical index of weathering (CIW was used to quantify the state of stone decay. The lithology and different types of alterations observed were mapped. A comparison of the material on the building to ancient quarries identified “Naranjo” as the possible site where the stone was originally quarried.Para la caracterización litológica y determinación del grado de alteración de los materiales pétreos se han empleado las siguientes técnicas: difracción de rayos X (método del polvo, microscopía petrográfica (sobre lámina delgada y microscopía de barrido con EDS (energía dispersiva de rayos X, para determinar la composición química. El estado de degradación del material pétreo se ha cuantificado a partir del índice químico de alteración (CIW. Se han realizado cartografías sobre la fachada oeste: a de las litologías presentes y b de los diferentes tipos de alteración observados. La comparación de muestras del edificio con las de antiguas canteras ha permitido identificar la del Naranjo como la posible cantera de origen.

da Região Oeste de Santa Catarina

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Valdir F. Denardin

2005-01-01

Full Text Available The agricultural activity developed in the western region of the state of Santa Catarina generates wealth on the one hand, but on the other it generates environmental degradation and consequently negative impacts for both humans and other forms of life. Considering this, the first objective of the article is to respond how it is possible to internalize the external factors generated by the agricultural sector. In this way two alternate theoretical models for internalization of the external costs are found in literature: Pareto Internalization and Institutional Internalization. The second objective, on the other hand, consists in identifying which type of internalization is best suited for the Western Santa Catarina region under a perspective which is aimed at sustainable development. To respond to this question it was necessary to discuss, theoretically, sustainable development, as well as weak and strong sustainability. Following this, the first option of internalization to be dealt with follows the perspective of a weak sustainability and the second of a strong sustainability.

Degradation of Semiconductor Manufacturing Wastewater by Using a Novel Magnetic Composite TiO2/Fe3O4 Photoreactor Design

Directory of Open Access Journals (Sweden)

Chen-Yu Chang

2012-01-01

Full Text Available The purpose of this research is to develop a photocatalytic TiO2 that can be activated by visible light and can be conveniently recollected for reusing. This research synthesizes the 20 to 40 nm TiO2/Fe3O4 particles with magnetization of 5.8 emu/g using the modified sol-gel method followed by 500°C calcinations. The experiment verified that visible fluorescent light (VFL, contains no UV-A could activate the photocatalytic activity of TiO2/Fe3O4 particles as did ultraviolet A light (UV-A, 360 nm. Regular magnets can be used to separate TiO2/Fe3O4 particles from solution. The results indicate that VFL-sirradiated TiO2/Fe3O4 particles could decompose isopropanol (IPA in the absence of UV-A and the issue of TiO2/Fe3O4 recollection from water for reusing is also resolved.

Migración negra en Santa Marta

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Josè Luis Vega de Lavalle

2013-11-01

Full Text Available El objetivo de este artículo es dar cuenta de los procesos e inserción urbana de la Gente Negra  se ha instalado en Santa Marta, los cuales han llegado a partir de la década de los años ochenta a  en el sector turístico de esta ciudad.

Qualidade de sementes de Lolium multiflorum tetraploide comercializadas em Santa Catarina

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Ricardo Miotto Ternus

2017-02-01

Full Text Available Na região Sul do Brasil, no período do inverno o azevém (Lolium multiflorum Lam se torna fundamental para a formação de pastagens. No entanto, o uso e a comercialização de sementes de azevém tetraploide têm crescido em relação aos diploides, devido, principalmente, a qualidade superior de suas sementes. O objetivo do trabalho foi avaliar a qualidade das sementes de azevém tetraploide, comercializadas no Estado de Santa Catarina. Foram utilizados seis lotes de sementes de azevém tetraploide da cultivar Barjumbo, oriundos de diferentes estabelecimentos comerciais do Estado de Santa Catarina. Cada lote de semente foi obtido a partir de coleta oficial. Buscaram-se lotes de sementes da categoria certificada, sendo dois lotes de cada país produtor (Argentina, Brasil e Uruguai. Avaliou-se a qualidade física e fisiológica a partir dos testes de pureza física, massa de mil sementes, teste de germinação, primeira contagem de germinação, comprimento da parte aérea e da raiz e massa seca da área e da raiz. Os resultados demonstram que 100% dos lotes analisados atendem os padrões legais de pureza física e germinação para a comercialização de sementes, independente da origem. Para o teste de germinação os resultados obtidos foram 27% superiores ao padrão legal. Os lotes de sementes de azevém tetraploides nacionais comercializados em Santa Catarina, mesmo apresentando-se dentro dos padrões legais para os testes de pureza física e germinação, apresentaram menor vigor quando comparados aos lotes oriundos da Argentina e Uruguai.Quality of Lolium multiflorum tetraploide seeds marketed in Santa CatarinaAbstract: In the southern region of Brazil, during the winter period ryegrass becomes essential for pasture formation. The use and commercialization of tetraploid ryegrass seeds has grown in relation to diploids, mainly due to the superior quality of their seeds. The objective of this work was to evaluate the quality of tetraploid

76 FR 31242 - Revisions to the California State Implementation Plan, Santa Barbara County Air Pollution Control...

Science.gov (United States)

2011-05-31

... the California State Implementation Plan, Santa Barbara County Air Pollution Control District AGENCY... limited disapproval of revisions to the Santa Barbara County Air Pollution Control District (SBCAPCD... BTU/hr and internal combustion engines with a rated brake horse power of 50 or greater. Under...

The evolving fresh market berry industry in Santa Cruz and Monterey counties

Directory of Open Access Journals (Sweden)

Laura Tourte

2016-08-01

Full Text Available The fresh market berry industry in Santa Cruz and Monterey counties has contributed significantly to the agricultural vibrancy of the two counties and the state of California. Dramatic growth in strawberry, raspberry and blackberry production has been documented over the last 50 years, and most notably since the 1980s. Factors influencing this growth include innovations in agricultural practices and heightened consumer demand. Here, we review the historical context for the berry industry in Santa Cruz and Monterey counties. Organic production, production economics and challenges for the future are also discussed.

[Catalytic Degradation of Diclofenac Sodium over the Catalyst of 3D Flower-like alpha-FeOOH Synergized with H2O2 Under Visible Light Irradiation].

Science.gov (United States)

Xu, Jun-ge; Li, Yun-qin; Huang, Hua-shan; Yuan, Bao-ling; Cui, Hao-jie; Fu, Ming-lai

2015-06-01

Three dimensional (3D) flower-like alpha-FeOOH nanomaterials were prepared by oil bath reflux method using FeSO4, urea, ethanol and water, and the products which were characterized by XRD, FT-IR and SEM techniques. The SEM images showed that the 3D flower-like samples consisted of nanorods with a length of 400-500 nm and a diameter of 40-60 nm. The catalytic performance of the samples was evaluated by catalytic degradation of diclofenac sodium using H2O2 as the oxidant under simulated visible light. The results showed that the as-prepared samples presented high efficient catalytic performances, and more than 99% of the initial diclofenac sodium (30 mg x L(-1)) was degraded in 90 min. A radical mechanism can be proposed for the catalytic degradation of diclofenac sodium solution.

White Light Photorefractive Phase Zone Plates

International Nuclear Information System (INIS)

Yuan-Mei, Gao; Si-Min, Liu

2008-01-01

Incoherent white light from an incandescent source is employed to fabricate volume phase zone plates in LiNbO 3 : Fe, for the first time to our knowledge, which can guide and modulate the input white light or laser light. The diffractive efficiency of the white light volume phase zone plates fabricated can reach as high as 12%. In addition, we test the volume phase zone plates by a probe beam and find that the volume phase zone plate is present in the direction perpendicular to the c-axis and absent in the direction parallel to the c-axis. This directly proves the existence of photovoltaic photorefractive anisotropy of white light

Transparent nanostructured Fe-doped TiO2 thin films prepared by ultrasonic assisted spray pyrolysis technique

Science.gov (United States)

Rasoulnezhad, Hossein; Hosseinzadeh, Ghader; Ghasemian, Naser; Hosseinzadeh, Reza; Homayoun Keihan, Amir

2018-05-01

Nanostructured TiO2 and Fe-doped TiO2 thin films with high transparency were deposited on glass substrate through ultrasonic-assisted spray pyrolysis technique and were used in the visible light photocatalytic degradation of MB dye. The resulting thin films were characterized by scanning electron microscopy (SEM), Raman spectroscopy, photoluminescence spectroscopy, x-ray diffraction (XRD), and UV-visible absorption spectroscopy techniques. Based on Raman spectroscopy results, both of the TiO2 and Fe-doped TiO2 films have anatase crystal structure, however, because of the insertion of Fe in the structure of TiO2 some point defects and oxygen vacancies are formed in the Fe-doped TiO2 thin film. Presence of Fe in the structure of TiO2 decreases the band gap energy of TiO2 and also reduces the electron–hole recombination rate. Decreasing of the electron–hole recombination rate and band gap energy result in the enhancement of the visible light photocatalytic activity of the Fe-doped TiO2 thin film.

Heterostructured ZnFe2O4/Fe2TiO5/TiO2 Composite Nanotube Arrays with an Improved Photocatalysis Degradation Efficiency Under Simulated Sunlight Irradiation

Science.gov (United States)

Xiong, Kun; Wang, Kunzhou; Chen, Lin; Wang, Xinqing; Fan, Qingbo; Courtois, Jérémie; Liu, Yuliang; Tuo, Xianguo; Yan, Minhao

2018-03-01

To improve the visible light absorption and photocatalytic activity of titanium dioxide nanotube arrays (TONTAs), ZnFe2O4 (ZFO) nanocrystals were perfused into pristine TONTA pipelines using a novel bias voltage-assisted perfusion method. ZFO nanocrystals were well anchored on the inner walls of the pristine TONTAs when the ZFO suspensions (0.025 mg mL-1) were kept under a 60 V bias voltage for 1 h. After annealing at 750 °C for 2 h, the heterostructured ZFO/Fe2TiO5 (FTO)/TiO2 composite nanotube arrays were successfully obtained. Furthermore, Fe3+ was reduced to Fe2+ when solid solution reactions occurred at the interface of ZFO and the pristine TONTAs. Introducing ZFO significantly enhanced the visible light absorption of the ZFO/FTO/TONTAs relative to that of the annealed TONTAs. The coexistence of type I and staggered type II band alignment in the ZFO/FTO/TONTAs facilitated the separation of photogenerated electrons and holes, thereby improving the efficiency of the ZFO/FTO/TONTAs for photocatalytic degradation of methylene blue when irradiated with simulated sunlight. [Figure not available: see fulltext.

Physiological quality of soybean seeds produced in four edaphoclimatic regions of Santa Catarina

OpenAIRE

Frandoloso,Volmir; Meneghello,Géri Eduardo; André,Maria Ângela; Deuner,Cristiane; Menegaz,Winicius

2015-01-01

Abstract:The production of soybeans in the state of Santa Catarina is quite significant in the national context, since the state is recognized for producing seeds with high standards of physiological quality, due to the use of modern technologies and favorable climatic conditions. The aim of this study was to evaluate the physiological quality of soybean seeds produced by major companies in the state of Santa Catarina, analyzed in three seasons: harvesting (reception at UBS), after processing...

Tri-functional Fe2O3-encased Ag-doped ZnO nanoframework: magnetically retrievable antimicrobial photocatalyst

Science.gov (United States)

Karunakaran, Chockalingam; Vinayagamoorthy, Pazhamalai

2016-11-01

Fe2O3-encased ZnO nanoframework was obtained by hydrothermal method and was doped with Ag through photoreduction process. Energy dispersive x-ray spectroscopy, transmission electron microscopy (TEM), high resolution TEM, selected area electron diffractometry, x-ray diffractometry and Raman spectroscopy were employed for the structural characterization of the synthesized material. While the charge transfer resistance of the prepared nanomaterial is larger than those of Fe2O3 and ZnO the coercivity of the nanocomposite is less than that of hydrothermally obtained Fe2O3 nanostructures. Although Fe2O3/Ag-ZnO exhibits weak visible light absorption its band gap energy does not differ from that of ZnO. The photoluminescence of the fabricated nanoframework is similar to that of ZnO. The radiative recombination of charge carriers is slightly slower in Fe2O3/Ag-ZnO than in ZnO. The synthesized Fe2O3-encased Ag-doped ZnO, under UV A light, exhibits sustainable photocatalytic activity to degrade dye and is magnetically recoverable. Also, the Fe2O3/Ag-ZnO nanocomposite disinfects bacteria effectively in absence of direct illumination.

Stratification of the state of Santa Catarina in macro-environments for bean cultivation

Directory of Open Access Journals (Sweden)

Juliano Garcia Bertoldo

2009-01-01

Full Text Available The purpose of this study was to suggest a division of the State of Santa Catarina in macro-environments forexperimentation and bean production. Data of the traits grain yield and plant cycle were evaluated in 10 common beangenotypes grown in nine environments. The data were submitted to the Student-Newman Keuls test, to detect differencesbetween environments, and the Best Linear Unbiased Prediction, to predict the environmental values. The results showed: (adifferences between the regions of Santa Catarina for the traits grain yield and plant cycle, which had a significant positivecorrelation of 0.26 (b Based on the genotypes and environments studied the state can be divided in two macro-environments(MA1 and MA2 and four micro-environments (MI1, MI2, MI3 and MI4. The state of Santa Catarina may be roughly dividedin at least two macro-environments for the recommendation of new cultivars.

A Santa Sé e a Conferência de Helsinque

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Virgílio Caixeta Arraes

2011-02-01

Full Text Available A presente exposição busca, brevemente, estudar a atuação da Santa Sé durante a Conferência de Helsinque e analisar a diplomacia pontifica durante esse período da Guerra Fria.

El registro biológico humano de la costa meridional de Santa Cruz

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Suby, Jorge A.

2009-01-01

Full Text Available La costa patagónica constituye un sector de riesgo para el registro arqueológico, asociado a factores naturales y antrópicos. Al mismo tiempo, la conservación de las colecciones bioarqueológicas, destacándose la pérdida de restos óseos e información asociada por escasez de recursos, desconocimiento o falta de atención especializada, representa escenarios de riesgo para el registro. Una de las áreas para las cuales no se dispone hasta el momento de información bioarqueológica es la región que comprende la costa meridional de la provincia de Santa Cruz. Considerando esta ausencia de información, el objetivo de este trabajo es presentar y discutir los primeros resultados sobre restos óseos humanos hallados en la región costera próxima a la desembocadura del Río Santa Cruz (Santa Cruz, Argentina. Los estudios incluyen el análisis de las situaciones de hallazgo y riesgo de los restos recuperados en acciones de rescate, el reconocimiento y puesta en valor de materiales depositados en el Museo Regional "Carlos Borgialli" (Puerto Santa Cruz, Santa Cruz, Argentina y estudios paleopatológicos. Al mismo tiempo se informan y analizan resultados cronológicos e isotópicos. Los resultados brindan evidencias claras de la ocupación de la región costera al menos durante los últimos 2000 años, consumo de recursos predominantemente terrestres y un estilo de vida que favorece el desarrollo de lesiones articulares, con escasos indicios de estrés sistémico que coinciden con los resultados reportados para la región continental del estrecho de Magallanes.

75 FR 9827 - Proposed Expansion of the Santa Maria Valley Viticultural Area (2008R-287P)

Science.gov (United States)

2010-03-04

...,'' by Harry P. Bailey, University of California Press, 1966). The maritime fringe climate derives from... California Press, 1975.) Soils: According to the petition, the current Santa Maria Valley viticultural area... viticultural area in Santa Barbara and San Luis Obispo Counties, California, by 18,790 acres. We designate...

Graphene Oxide-terpyridine Conjugate: A Highly Selective Colorimetric and Sensitive Fluorescence Nano-chemosensor for Fe2+ in Aqueous Media

Directory of Open Access Journals (Sweden)

Bagher Eftekhari-Sis

2016-07-01

Full Text Available A graphene oxide-terpyridine conjugate (GOTC based colorimetric and fluorescent nano-chemosensor was synthesized. It showed high selectivity and sensitivity for Fe2+ and Fe3+ ions in neutral aqueous solution over other metal ions such as Li+, Na+, Ba2+, Ca2+, Al3+, Cd2+, Co2+, Cu2+, Hg2+, Mn2+, Ni2+, Pb2+, Zn2+, Cr3+ and Ag+. In absorption spectra, upon addition of Fe2+ or Fe3+, the sensor displayed a peak at 568 nm, by changing the color of the solution from light pink for GOTC to light magenta and deep magenta for Fe3+ and Fe2+, respectively. Also, the fluorescence studies revealed that, Fe2+, Fe3+ and Co2+ quench the emission of GOTC at 473 nm, while other metal ions do not quench the fluorescence of GOTC in solution. Colorimetric and fluorescence techniques could be used for detection of Fe2+ ion concentration at least about 6-10 μM in water solution. The sensing on test paper was also investigated for the naked-eye detection of Fe2+.

Conidiobolomicose causada por Conidiobolus lamprauges em ovinos no Estado de Santa Catarina Conidiobolomycosis caused by Conidiobolus lamprauges in sheep in the state of Santa Catarina, Brazil

Directory of Open Access Journals (Sweden)

Fernando Henrique Furlan

2010-07-01

Full Text Available Descreve-se um surto de conidiobolomicose em ovinos no Estado de Santa Catarina. O surto ocorreu entre os meses de dezembro e março de 2006, no município de Santo Amaro da Imperatriz, região litorânea do Estado. A propriedade possuía 75 ovinos da raça Santa Inês e seis desses animais adoeceram. Clinicamente os animais doentes apresentavam dificuldade respiratória, corrimento nasal seroso a mucossanguinolento e, por vezes exolftalmia. Na necropsia verificou-se uma massa amarelada na região etmoidal e adjacências que, às vezes, atingia os linfonodos regionais, cérebro, globo ocular e pleura. Microscopicamente a massa caracterizava-se por infiltrado inflamatório granulomatoso com áreas necróticas associadas a hifas largas pouco ramificadas. Através de exame molecular detectou-se DNA de Conidiobolus lamprauges. Os aspectos clínicos, epidemiológicos, macroscópicos, microscópicos e moleculares caracterizam a conidiobolomicose causada por Conidiobolus lamprauges em ovinos.An outbreak of conidiobolomycosis affecting sheep in the State of Santa Catarina, Southern Brazil is reported. The disease occurred in six Santa Inês breed sheep from a flock of 75 during the rainy season. Common clinical signs were noisy respiration and dyspnea, serous to mucosanguineous nasal discharge and exophthalmus. At necropsy there was a dense yellow mass in the nasopharyngeal area affecting the ethmoidal region, turbinate bones and occasionally limph nodes, central nervous system and pleura. Histopathologycally there was multifocal granulomas whith an eosinophilic necrotic reaction containing ribbon type hyphae similar to zygomycetous fungi. At molecular examination Conidiobolus lamprauges DNA was detected. The clinical, epidemiological, macroscopical, microscopical and molecular aspects characterize conidiobolomycosis caused by Conidiobolus lamprauges in sheep.

Iron modified bentonite: Enhanced adsorption performance for organic pollutant and its regeneration by heterogeneous visible light photo-Fenton process at circumneutral pH

International Nuclear Information System (INIS)

Gao, Yaowen; Guo, Yongzhao; Zhang, Hui

2016-01-01

Highlights: • The iron modification markedly improved the adsorption performance of FeMB for RhB. • LED lamps emitting white light were employed as visible light source. • FeMB can be regenerated by visible light photo-Fenton process at circumneutral pH. • FeMB can be reused repeatedly after the heterogeneous photo-Fenton regeneration. - Abstract: Iron modified bentonite (FeMB) was prepared and used as an inexpensive adsorbent to rapidly remove organic pollutant (Rhodamine B, RhB) from aqueous solution. The iron modification significantly improved the adsorption performance of FeMB for RhB and permitted an easy separation of FeMB from the treated effluent. The equilibrium adsorption studies indicated that the dye molecules obeyed Langmuir type of adsorption with the calculated maximum adsorption capacity of 168.13 mg g"−"1 for FeMB. The heterogeneous photo-Fenton process operated at circumneutral pH in the presence of visible light irradiation was found to be effective for the regeneration of the spent FeMB. Furthermore, the regeneration efficiency of as high as 79% was still achieved after 5 consecutive adsorption-regeneration cycles. Considering that, the visible light photo-Fenton approach could be applied as an excellent alternative for regenerating clay-based adsorbents by avoiding the use of dissolved iron salts.