119,328 research outputs found
Escritoras y periodistas contemporáneas en Italia y en España: temáticas y lugares comunes
No full textMicrostructure and precipitation in Al-Li-Cu-Mg-(Mn, Zr) alloys
No full textHot rolled Al-6Li-1Cu-1Mg-0.2Mn (at.%) (Al-1.6Li-2.2Cu-0.9Mg-0.4Mn, wt.%) and Al-6Li-1Cu-1Mg-0.03Zr (at.%) (Al-1.6Li-2.3Cu-1Mg-0.1Zr, wt.%) alloys developed for age forming were studied by tensile testing, electron backscatter diffraction (EBSD), three-dimensional atom probe (3DAP), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). For both alloys, DSC analysis shows that ageing at 150°C leads initially to formation of zones/clusters, which are later gradually replaced by S phase. On ageing at 190°C, S phase formation is completed within 12 h. The precipitates identified by 3D atom probe and TEM can be classified into (a) Li-rich clusters containing Cu and Mg, (b) a plate-shaped metastable precipitate (similar to GPB2 zones/S''), (c) S phase and (d) delta' spherical particles rich in Li. The Zr containing alloy also contains beta' (Al3Zr) precipitates and composite beta'/delta' particles. The beta' precipitates reduces recrystallisation and grain growth leading to fine grains and subgrains
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
La narrativa de Carmen Martín Gaite en Italia: “Nubosidad variable” y la problemática y metodología de su traducción al italiano
No full textKjemisk/økotoksikologisk karakterisering av avløpsvann fra Sande Paper Mill AS
No full textÅrsliste 2001Avløpsvann fra Sande Paper Mill AS papirfabrikk i Sande er blitt karakterisert ved kjemiske analyser og økotoksikologiske tester. En prøve av utgående avløpsvann fra fabrikken ble tatt i juli 2001. Prøvens innhold av organisk karbon var 315 mg/l. Innholdet av total fosfor og nitrogen var hhv. 0.6 og 2.3 mg/l. Konsentrasjonene av tungmetaller var lave. tungmetaller var lave. Toksisitetstester med marine planktonalger (Skeletonema costatum) og krepsdyr (Acartia tonsa) viste giftighet ved høye konsentrasjoner av avløpsvann. EC50 for veksthemming av S. costatum var 40% og LC50 for A. tonsa 34% konsentrasjon av avløpsvann. Testene ble utført med tilsetning av salter for å unngå effekter av for lav saltholdighet i ufortynnet avløpsvann. Ingen dødelighet av fisk (piggvar) ble observert i 50% avløpsvann fortynnet i sjøvann. sjøvann. En enkel risikoanalyse indikerer at avløpsvannet må fortynnes ca. 30 ganger for å unngå fare for akutt giftvirkning. Tilsvarende er fortynningsbehovet for å unngå kroniske gifteffekter ca. 60 ganger. På grunn av at utslippet skjer i åpent vann vil kroniske effekter kun ramme frittsvømmende organismer som aktivt oppholder seg i utslippsområdet.Kjeleforeningen Norsk Energ
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Evaluación de la actividad antifúngica en Moniliophthora roreri de frutos de cacao (Theobroma cacao L) de extractos de látex de sande de Brosimum utile kunth
No full textSe realizó la evaluación de la actividad antifúngica en Moniliophthora roreri aislados de frutos de Cacao (Theobroma cacao L) de extractos de látex de Sande de Brosimum utile Kunth, desarrollada en los Laboratorios de: Productos Naturales de Fitoquímica de la Escuela de Bioquímica Farmacia y microbiología de la Facultad de Ciencias de la Escuela Superior Politécnica de Chimborazo para determinar los metabolitos con posibles aplicaciones en el tratamiento de plagas y enfermedades. Se recolectó adecuadamente una muestra del látex de Sande de la especie B.utile, de la parroquia La Belleza, provincia de Orellana. Posteriormente se determinó las características organolépticas, parámetros fisicoquímicos, se realizó el tamizaje fitoquímico y la extracción de la fracción terpénica y alcaloide. Mientras, que el fitopatógeno fue aislado satisfactoriamente en agar Sabouraud, para ello, se localizaron parcelas de cacao infectado por el hongo y se realizó un muestreo aleatorio simple de frutos enfermos. En el tamizaje se determinó la presencia de compuestos grasos, terpenos y/o esteroides, alcaloides, compuestos fenólicos, resinas y saponinas. El rendimiento a escala de laboratorio de la fracción terpénica fue mejor en relación a la de los alcaloides. En la evaluación de la actividad antifúngica el extracto total y el terpénico mostraron actividad en M. roreri a 2000 ppm mientras que el extracto alcaloide a 500 ppm ya muestra actividad antifúngica sobre el fitopatógeno. Por tanto, se puede realizar aplicaciones a nivel de la agricultura principalmente en el control de plagas y enfermedades. Se concluye que los terpenos identificados en el extracto hexánico y alcaloides en el extracto clorofórmico del látex de Sande de Brosimum utile presentan actividad antifúngica in vitro. Se recomienda identificar molecularmente el tipo de terpenos y alcaloides presentes en el látex de Sande para atribuir con mayor exactitud los responsables de la actividad antifúngica.An evaluation of antifungal activity in
Moniliophthora roreri
isolated from fruit of cacao
tree (
Theobroma cacao L)
latex Sande
Brosimum utile
Kunth extract was developed in the
laboratories of: natural phytochemical products from
Biochemistry and Microbiology
pharmacy School of Sciences Faculty at the Polytechnic School of Chimborazo to
determine the metabolites with potential applications in the pests and diseases treatment. It
collected a sample of latex Sande of
B.utile
specie
from la Belleza parish at Orellana
province. After that were determined the organoleptic characteristics, physicochemical
parameters, phytochemical screening was performed and the removal of terpene fraction
and alkaloid. While, the plant pathogen was isol
ated successfully in agar Sabouraud, for
this were located cocoa plots infect by the fungus and a simple random of spoil fruits was
performed. In screening was determined fatty compounds, terpenes and/or steroids,
alkaloids, phenolic compounds, resins and
saponins. The performance laboratory scale of
terpene fraction was bether from the alkaloids. In the evaluation of the antifungal activity
the total terpene extract showed activity in
M. roreri
to 2.000 ppm while the alkaloid
extract 500 ppm shows antifun
gal activity against the phytopathogen. Therefore
applications can be performed in the agriculture mainly in the control of pest and diseases.
The terpenes identifified in the hexane extract and chloroform extract alkaloids of latex
Sande
Brosimum utile
ha
ve antifungical activity
in vitro.
It is recommend to identify
molecularly the type of terpenes and alkaloids existent in latex Sande to attribute more
accurately the responsible for the antifungal activity
Letter from unknown writer to Jesse L. Boyce
No full textLetter to Jesse L. Boyce from unknown author (possibly Jack) about the investigation into the powder magazine located in the Grand Canyon. Some personal news is included in the letter such as the writer's marriage to the daughter of C.A. Taylor, former Supervisor of Cochise County
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