129 research outputs found
Weak-Type Inequality for Conjugate First Order Riesz-Laguerre Transforms
No full textIn this paper we introduce a conjugate class of Riesz transforms in the context of Laguerre polynomials. We prove their weak-type (1,1) and Lp, 1Fil: Forzani, Liliana Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Diversidad y Ecología Animal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto de Diversidad y Ecología Animal; ArgentinaFil: Sasso, E.. Università degli Studi di Genova; ItaliaFil: Scotto, Roberto Aníbal. Universidad Nacional del Litoral; Argentin
LDR: A Package for Likelihood-Based Sufficient Dimension Reduction
No full textWe introduce a new mlab software package that implements several recently proposed likelihood-based methods for sufficient dimension reduction. Current capabilities include estimation of reduced subspaces with a fixed dimension d, as well as estimation of d by use of likelihood-ratio testing, permutation testing and information criteria. The methods are suitable for preprocessing data for both regression and classification. Implementations of related estimators are also available. Although the software is more oriented to command-line operation, a graphical user interface is also provided for prototype computations.
Weak-type Inequalities for higher order Riesz-Laguerre Transforms
No full textIn this paper we study the weak-type (1,1) boundedness of the
higher order Riesz-Laguerre transforms associated with the Laguerre
polynomials. In particular, we obtain the boundedness for the
Riesz-Laguerre transforms of order 2 and we find also the sharp
polynomial weight w that makes the Riesz-Laguerre transforms
of order greater than two continuous from L^1(d w mu_alpha)
into L^{infty}(d mu_alpha), being mu_alpha the Laguerre measure
Weighted inequalities for the two-dimensional one-sided Hardy-Littlewood maximal function
No full textIn this work we characterize the pairs of weights (w, v) such that the one-sided Hardy-Littlewood maximal function in dimension two is of weak-type (p, p), 1 ≤ p ≤ ∞, with respect to the pair (w, v). As an application of this result we obtain a generalization of the classic Dunford-Schwartz Ergodic Maximal Theorem for bi-parameter flows of null-preserving transformations.Fil: Forzani, Liliana Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Matemática Aplicada del Litoral. Universidad Nacional del Litoral. Instituto de Matemática Aplicada del Litoral; ArgentinaFil: Martín-Reyes, F.J.. Universidad de Málaga; EspañaFil: Ombrosi, Sheldy Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Matemática Bahía Blanca. Universidad Nacional del Sur. Departamento de Matemática. Instituto de Matemática Bahía Blanca; Argentin
Properties of the solutions to the Monge-Ampère equation
No full textWe consider solutions to the equation detD2φ=μ when μ has a doubling property. We prove new geometric characterizations for this doubling property (by means of the so-called engulfing property) and deduce the quantitative behaviour of φ. Also, a constructive approach to the celebrated C1,β-estimates proved by L. Caffarelli is presented, settling one of the open questions posed by Villani (Amer. Math. Soc. 58 (2003)).Fil: Forzani, Liliana Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Matemática Aplicada del Litoral. Universidad Nacional del Litoral. Instituto de Matemática Aplicada del Litoral; ArgentinaFil: Maldonado, Diego. University Of Kansas, Lawrence
A mean-value inequality for non-negative solutions to the linearized monge-ampère equation
No full textWe prove a mean value inequality for non-negative solutions to L in any domain Ω∈∈ n , where L is the Monge-Ampère operator linearized at a convex function, under minimal assumptions on the Monge-Ampère measure of. An application to the Harnack inequality for affine maximal hypersurfaces is included.Fil: Forzani, Liliana Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Matemática Aplicada del Litoral. Universidad Nacional del Litoral. Instituto de Matemática Aplicada del Litoral; ArgentinaFil: Maldonado, Diego. Kansas State University; Estados Unido
Use of vegetation to increase building energy efficiency: application to a real case study
No full textThe research here presented deals with the relationship between vegetation and architecture, and how its presence can influence a building project and performance. In the last years, many ways of integrating green in building envelopes have already been experimented, for their potential of reducing thermal loads; the research investigates a specific solution, the vertical forest, which integrates trees and small bushes in specific permanent planters on balconies of high-rise buildings. The main scope is to understand if trees, treated as shadings, can really affect positively the building energy consumptions. Moreover, other aspects, such as trees mechanical stability, construction issues and maintenance are deepened. Through a particular case study, energy consumptions are analysed using dynamic simulations tools, developed with GrasshopperTM and EnergyPlusTM software, in which trees are considered as special external shadings, characterized by a variable permeability to solar radiation during the year. Results demonstrate that trees can contribute to reduce energy loads, depending on species and orientation, especially in association with traditional shading systems. Eventually, some guidelines on technological and construction aspects, as well as on trees species selection, are given, in order to assure the optimal vegetation life and to maximize its benefits on the building
Green walls for advanced building envelopes: design optimization and analysis - A case study in Milan
No full textThe paper illustrates the potential use of green walls for advanced building envelopes. In the last years, several technological systems have been developed for green building envelopes. They can be categorised into two groups, according to their system and growing methods: green façades and living walls. Green façades are created by growing climbing plants up and across the façade itself, either from plants grown in garden beds at its base, or by container planting installed at different levels; they can be direct (i.e. self-clinging climbers, deciduous or evergreen, which adhere to the building exterior by means of adventitious roots) or indirect, where plants are kept away from the walls by continuous supporters and substructures. Living wall systems differ from green façades in the fact that they incorporate multiple ‘containerised’ plantings to create a vegetation cover rather than being reliant on fewer numbers of plants that climb and spread. Once decided to include vegetation into the building project, several questions may be asked. The first one is about structural stability and safety, as envelopes have to be designed to withstand very high dead loads. Another crucial safety aspect is the fire performance: vegetation could be considered a fire propagation medium ‘par excellence’, and the façade must be designed to assure that, in case of fire, its propagation is reduced as much as possible. Moreover, plants sustentation should be carefully considered, since they have to receive light and water to naturally live and grow; natural light supply depends on surroundings and building shape; water supply could be more problematic, because a system of water irrigation and disposal must be designed and integrated in the building envelope. If not properly designed, these aspects can lead to cumbersome and noisy drainpipes and to maintenance issues related to difficulties in inspections and replacement of the drainage components in case of damage Therefore, a very important aspect is maintenance, and maintenance schedule as well: plants need to be cut to keep them healthy, and excessive or abnormal grow has to be avoided. Maintenance system is a sensitive issue, and the designer should think about it since the beginning. This paper presents and details a case study of an office building in Milan with an indirect green façade: vine plants are located in special planters across the façade, and they are free to grow and develop along metal wires included in the curtain wall. Eventually, technical aspects are analysed and some guidelines on technological and construction aspects are given, in order to assure the optimal vegetation life
Green walls for advanced building envelopes: design optimization and analysis - A case study in Milan
No full textThe paper illustrates the potential use of green walls for advanced building envelopes. In the last years, several technological systems have been developed for green building envelopes. They can be categorised into two groups, according to their system and growing methods: green façades and living walls. Green façades are created by growing climbing plants up and across the façade itself, either from plants grown in garden beds at its base, or by container planting installed at different levels; they can be direct (i.e. self-clinging climbers, deciduous or evergreen, which adhere to the building exterior by means of adventitious roots) or indirect, where plants are kept away from the walls by continuous supporters and substructures. Living wall systems differ from green façades in the fact that they incorporate multiple ‘containerised’ plantings to create a vegetation cover rather than being reliant on fewer numbers of plants that climb and spread. Once decided to include vegetation into the building project, several questions may be asked. The first one is about structural stability and safety, as envelopes have to be designed to withstand very high dead loads. Another crucial safety aspect is the fire performance: vegetation could be considered a fire propagation medium ‘par excellence’, and the façade must be designed to assure that, in case of fire, its propagation is reduced as much as possible. Moreover, plants sustentation should be carefully considered, since they have to receive light and water to naturally live and grow; natural light supply depends on surroundings and building shape; water supply could be more problematic, because a system of water irrigation and disposal must be designed and integrated in the building envelope. If not properly designed, these aspects can lead to cumbersome and noisy drainpipes and to maintenance issues related to difficulties in inspections and replacement of the drainage components in case of damage Therefore, a very important aspect is maintenance, and maintenance schedule as well: plants need to be cut to keep them healthy, and excessive or abnormal grow has to be avoided. Maintenance system is a sensitive issue, and the designer should think about it since the beginning. This paper presents and details a case study of an office building in Milan with an indirect green façade: vine plants are located in special planters across the façade, and they are free to grow and develop along metal wires included in the curtain wall. Eventually, technical aspects are analysed and some guidelines on technological and construction aspects are given, in order to assure the optimal vegetation life
The structure of increasing weights on the real line
No full textWe examine the structure of a variety of related weight classes on the real line and the positive real axis: doubling measures, Ap weights, the Bp weights of Ari˜no and Muckenhoupt, and 2 Young functions. We give a number of characterizations of these classes. As applications we compute the Matuszewska- Orlicz indices of a Young function due to Lindberg [27], give a sufficient condition for a function m to be a multiplier of the doubling measures on R+ and answer a question on quasi-symmetric mappings raised by the first author in [4].Fil: Cruz-Uribe, David. University of Alabama at Birmingahm; Estados UnidosFil: Forzani, Liliana Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Matemática Aplicada del Litoral. Universidad Nacional del Litoral. Instituto de Matemática Aplicada del Litoral; ArgentinaFil: Maldonado, Diego. Kansas State University; Estados Unido
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