1,880 research outputs found
Wilson, J. R., Panetta, F. D. & Lindgren, C.— Detecting and responding to alien plant incursions. Ecology, Biodiversity and Conservation, Cambridge University Press, Cambridge & New York, 2016
No full textÉrard Chr. Wilson, J. R., Panetta, F. D. & Lindgren, C.— Detecting and responding to alien plant incursions. Ecology, Biodiversity and Conservation, Cambridge University Press, Cambridge & New York, 2016. In: Revue d'Écologie (La Terre et La Vie), tome 72, n°4, 2017. p. 444
Test of different sensitizing dyes in dye-sensitized solar cells based on Nb2O5 photoanodes
No full textHigh-performance dyes routinely employed in TiO2-based dye-sensitized solar
cells (DSSCs) were tested in cells assembled using Nb2O5 nanostructure-based photoanodes.
The sensitizers were chosen among both metal-complex (two Ru-based, N749 and C106, and one
Zn-based dye, DNF12) and metal-free organic dyes (DNF01, DNF11 and DNF15). Two different
sensitization processes were performed: the one commonly used for TiO2 photoanodes, and a new
process relying on high pressure by autoclavation. The assembled cells were characterized by current
density–voltage (J–V) curves under air mass (AM) 1.5 G illumination and in the dark, incident
photon-to-current efficiency (IPCE) measurements, and electrochemical impedance spectroscopy.
The tested cells show different proportional efficiencies of the dyes under investigation for Nb2O5-
and TiO2-based devices. Furthermore, the results were compared with those obtained in our previous
work using N719 anchored on Nb2O5. A remarkable efficiency value of 4.4% under 1 sun illumination
was achieved by coupling the C106 dye with a nonvolatile electrolyte. This value is higher than the
one attained under the same conditions by using N719
Skeleton weed : how serious a threat in Western Australia?
No full textSkeleton weed is probably the most serious weed ever to threaten the Australian wheat industry. It interferes with wheat cropping at two stages: through competition with the growing crop, particularly for nitrogen and water during the crop\u27s development: and later through the production of a tall, wiry flowering stem which tangles in harvesting machinery and can make harvesting difficult, if not impossible.
The weed is a major problem in eastern Australia although a combination of cultural, chemical and biological control programmes is helping to reduce its impact.
In Western Australia, skeleton weed is being contained mainly by eradication efforts. Weed Agronomy Research Officers, F.D. Panetta and J. Dodd, are studying the ecology of skeleton weed to determine why it hasn\u27t spread further and how current control methods can be more effectively applied
Estudio del crecimiento tumoral en un modelo Kirschner Panetta con efecto de Interleucina-2
No full textIncluye tablas y graficas.El cáncer es una de las principales causas de muerte en el mundo. La Organización Mundial de la Salud (OMS) define el cáncer como un grupo amplio de enfermedades que pueden afectar cualquier órgano o tejido del cuerpo, también conocidas como tumores malignos o neoplasias malignas. Cada año, el cáncer causa aproximadamente 10 millones de muertes, lo que resulta en un desenlace trágico para muchas familias. Esta situación es provocada por la proliferación descontrolada de células dañadas que pueden diseminarse por todo el cuerpo.
Dada esta realidad, la epidemiología desempeña un papel crucial en el estudio de los diferentes modelos matemáticos propuestos para comprender y combatir el cáncer. La falta de información cuantitativa ha sido un desafío, principalmente debido a las limitaciones en la experimentación con seres humanos. Sin embargo, los modelos matemáticos proporcionan una herramienta valiosa para explorar las dinámicas de la enfermedad y sus posibles tratamientos.
El modelo estudiado en este trabajo es el modelo de Kirschner y Panetta, que se basa en el modelo de Lotka-Volterra. Este sistema de ecuaciones diferenciales es fundamental para el estudio de la dinámica poblacional biológica. El modelo de Kirschner y Panetta considera dos ecuaciones diferenciales ordinarias y ha sido modificado para contribuir al desarrollo de modelos epidemiológicos que se basan en factores determinantes, predicciones y control de factores relacionados con la salud y las enfermedades. Estos modelos también estudian la dinámica y distribución de las enfermedades virales en una población.Introducción. -- 1 Marco referencial. -- 1.1 Antecedentes del problema. -- 1.2 Modelo de lotka-volterra. -- 1.3 Mejoras en los terminos de la ecuacion. -- 1.4 Modelo de kuznetsov y taylor. -- 1.5 Modelo de inmunoterapia del tumor kirschner-panetta. -- 1.6 Puntos fijos. -- 1.7 Estabilidad local de puntos fijos. -- 2 Materiales y métodos. -- 3 Resultados. -- 3.1 Puntos fijos del sistema ce-ct-me. -- 3.2 Estabilidad de los puntos fijos del sistema ce-ct-me. -- 4 Análisis de resultados. -- 5 Conclusiones. – Bibliografía. -- Resumen analitico especializado.Informe final modalidad trabajo de grado como requisito para optar por el título de Licenciado en MatemáticasPregradoLicenciado(a) en Matemática
Skeleton weed : how serious a threat in Western Australia?
No full textSkeleton weed is probably the most serious weed ever to threaten the Australian wheat industry. It interferes with wheat cropping at two stages: through competition with the growing crop, particularly for nitrogen and water during the crop\u27s development: and later through the production of a tall, wiry flowering stem which tangles in harvesting machinery and can make harvesting difficult, if not impossible.
The weed is a major problem in eastern Australia although a combination of cultural, chemical and biological control programmes is helping to reduce its impact.
In Western Australia, skeleton weed is being contained mainly by eradication efforts. Weed Agronomy Research Officers, F.D. Panetta and J. Dodd, are studying the ecology of skeleton weed to determine why it hasn\u27t spread further and how current control methods can be more effectively applied
The potential for skeleton weed
No full textSince its introduction into Australia during the 900s skeleton weed has become one of the most economically significant weeds. Its presence in cereal crops in south-eastern Australia has caused suvere yield reductions and harvesting problems.
Skeleton weed was first found on a Western Australian farm in 963. Since then it has been the subject of an intensive eradication campaign organised by the Agricultural Protection Board and funded by an annual levy on wheat growers. Such campaigns, which rely mainly on volunteer searchers, do not exist in eastern Australia because the weed is so widespread it would be impossible to eradicate.
Studies conducted by the Weed Agronomy research officers, FD Panetta and J Dodd have led to a greater understanding of the biology and porential of skeleton weed in Western Australia. The following article is a sequel to their earlier article in the Journal of Agriculture (Panetta and Dodd 1984) and assesses what influences the establishment and spread of skeleton weed in this State
The potential for skeleton weed
No full textSince its introduction into Australia during the 900s skeleton weed has become one of the most economically significant weeds. Its presence in cereal crops in south-eastern Australia has caused suvere yield reductions and harvesting problems.
Skeleton weed was first found on a Western Australian farm in 963. Since then it has been the subject of an intensive eradication campaign organised by the Agricultural Protection Board and funded by an annual levy on wheat growers. Such campaigns, which rely mainly on volunteer searchers, do not exist in eastern Australia because the weed is so widespread it would be impossible to eradicate.
Studies conducted by the Weed Agronomy research officers, FD Panetta and J Dodd have led to a greater understanding of the biology and porential of skeleton weed in Western Australia. The following article is a sequel to their earlier article in the Journal of Agriculture (Panetta and Dodd 1984) and assesses what influences the establishment and spread of skeleton weed in this State
Dove vanno i laici. Note sull’etica di Paolo Bonetti
No full textIl purgatorio dei laici, a book published by Paolo Bonetti in 2008, is an expression of the “restless laity” of its author. Composed of a series of meditations on the present stage of ethics, especially in its relations with the Catholic religion, that book appears to us today as a collection of “ethical fragments” from which we derive still useful reflections on the present stage of ethics in its relationships with bioethics and on the limits and paradoxes of a metaphysics and immutable "human nature". Reasonable claim to the authentic meaning of secularism and liberalism – keywords of Bonettian ethics –, this article was born from the attempt to trace a profile of the philosopher Bonetti before the challenges of contemporary world’s complexity
Screen printed Pb3O4 films and their application to photoresponsive and photoelectrochemical devices
No full textA new and simple procedure for the deposition of lead (II, IV) oxide films by screen printing was developed. In contrast to conventional electrochemical methods, films can be also deposited on non-conductive substrates without any specific dimensional restriction, being the only requirement the thermal stability of the substrate in air up to 500 °C to allow for the calcination of the screen printing paste and sintering of the film. In this study, films were exploited for the preparation of both photoresponsive devices and photoelectrochemical cell photoanodes. In both cases, screen printing was performed on FTO (Fluorine-Tin Oxide glass) substrates. The photoresponsive devices were tested with I-V curves in dark and under simulated solar light with different irradiation levels. Responses were evaluated at different voltage biases and under light pulses of different durations. Photoelectrochemical cells were tested by current density−voltage (J-V) curves under air mass (AM) 1.5 G illumination, incident photon-to-current efficiency (IPCE) measurements, and electrochemical impedance spectroscopy
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