1,932 research outputs found
Solyanik estimates in harmonic analysis
Let denote a collection of open bounded sets in ,
and define the associated maximal operator by The sharp Tauberian constant of associated to ,
denoted by , is defined as Motivated by previous work of
A. A. Solyanik, we show that if is the uncentered
Hardy-Littlewood maximal operator associated to balls, the estimate holds. Similar
results for iterated maximal functions are obtained, and open problems in the
field of Solyanik estimates are also discussed.Comment: 17 pages, 2 figures, minor typos corrected, to appear in Springer
Proceedings in Mathematics & Statistic
Mixing solutions for the Muskat problem
We prove the existence of mixing solutions of the incompressible porous media
equation for all Muskat type initial data in the fully unstable regime.Comment: 88 pages, 2 figure
Breakdown of smoothness for the Muskat problem
In this paper we show that there exist analytic initial data in the stable
regime for the Muskat problem such that the solution turns to the unstable
regime and later breaks down i.e. no longer belongs to .Comment: 93 pages, 10 figures (6 added
Can María speak?: Interpreting Ixcanul/Volcano (2015) from a decolonial perspective
This article explores, describes and analyses the material, linguistic and cultural framework in which the central conflict in Ixcanul/Volcano (Bustamante, 2015) and its mise-en-scène operate, considering the film as an example of an intertextual practice that succeeds in connecting oral and dramatic traditions to a filmic register. By analysing how the film aims to be realistic and locate itself within a contemporary Guatemalan context, this study argues that, due to the film’s political intentions, themes and intended audience, Ixcanul challenges several power structures that preclude decolonial dialogue in the country. Furthermore, by describing how the subaltern subject, María, endures and resists strategies of invisibilization, I read Ixcanul in light of analytical tools drawn from postcolonial and decolonial frameworks to disentangle the structures of domination – the coloniality of power – represented in the film
Roper Excitation in Alpha-Proton Scattering
We study the Roper excitation in the reaction. We consider
all processes which may be relevant in the Roper excitation region, namely,
Roper excitation in the target, Roper excitation in the projectile, and double
excitation processes. The theoretical investigation shows that the
Roper excitation in the proton target mediated by an isoscalar exchange is the
dominant mechanism in the process. We determine an effective isoscalar
interaction by means of which the experimental cross section is well
reproduced. This should be useful to make predictions in related reactions and
is a first step to construct eventually a microscopic
transition potential, for which the present reaction does not offer enough
information.Comment: Latex 17 pages; figures available by request; Phys. Rev. C in prin
Evaluación de variedades de caña de azúcar (Saccharum spp.) para la producción de panela en linares departamento de Nariño
Con el fin de mejorar la producción de panela, en el municipio de Linares, Nariño (01º 21’
22.4”Norte y 77º 31’ 77.5”Oeste), se evaluó el comportamiento agronómico y
agroindustrial de siete variedades de caña de azúcar. Se empleó un diseño estadístico de
bloques completos al azar con siete tratamientos y tres repeticiones. Los resultados
mostraron que las variedades CC 84-75, CC 85-92, CC 85-47 y RD 75-11, presentaron bajo
volcamiento, las cuales pueden ser consideradas promisorias para la producción de panela.
Las seis variedades de caña y el testigo presentaron buen comportamiento fitosanitario ante
la presencia de las enfermedades Bipolaris sacchari (mancha de ojo) y Leptosphaeria
sacchari (mancha de anillo) y por tanto se clasifica como resistente bajo condiciones
naturales de infección. Las seis variedades introducidas mostraron comportamiento similar
al testigo en incidencia de daño por el barrenador Diatraea spp. y rendimiento de panela el
cual osciló entre 10.77 t.ha-1 y 16.15 t.ha-1 sin diferencias significativas entre tratamientos
(p > 0.05)
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