LpL^p-boundedness properties for the maximal operators for semigroups associated with Bessel and Laguerre operators

In this paper we prove that the generalized (in the sense of Caffarelli and Calder\'on) maximal operators associated with heat semigroups for Bessel and Laguerre operators are weak type (1,1). Our results include other known ones and our proofs are simpler than the ones for the known special cases.Comment: 8 page

Image quality eigenfunctions for the human eye

This work presents a compact statistical model of the retinal image quality in a large population of human eyes following two objectives. The first was to develop a general modal representation of the optical transfer function (OTF) in terms of orthogonal functions and construct a basis composed of cross-correlations between pairs of complex Zernike polynomials. That basis was not orthogonal and highly redundant, requiring the application of singular value decomposition (SVD) to obtain an orthogonal basis with a significantly lower dimensionality. The first mode is the OTF of the perfect system, and hence the modal representation, is highly compact for well-corrected optical systems, and vice-versa. The second objective is to apply this modal representation to the OTFs of a large population of human eyes for a pupil diameter of 5 mm. This permits an initial strong data compression. Next, principal component analysis (PCA) is applied to obtain further data compression, leading to a compact statistical model of the initial population. In this model each OTF is approximated by the sum of the population mean plus a linear combination of orthogonal eigenfunctions (eigen-OTF) accounting for a selected percentage (90%) of the population variance. This type of models can be useful for Monte Carlo simulations among other application

Process planning and metallurgical issues for laser asisted spin froming of dual phase automotive steel

Postprint (published version

The role of non-specific effects in the psychological treatment of adolescents with social phobia

El objetivo de este estudio es analizar los efectos específicos del programa Intervención en Adolescentes con Fobia Social Generalizada (IAFS) junto a los factores inespecíficos de las intervenciones utilizadas en el tratamiento de adolescentes con fobia social (por ejemplo, características del paciente o del terapeuta, expectativas hacia el tratamiento o respecto de la atención y el apoyo prestado por el terapeuta). Para ello, se seleccionan al azar 77 adolescentes y se distribuyen aleatoriamente a cuatro condiciones experimentales: grupo de tratamiento psicológico (paquete multicomponente IAFS), grupo de transmisión de información o educativo, grupo placebo y grupo de control lista de espera. Los resultados muestran la eficacia tanto a corto como a medio plazo (12 meses) del programa IAFS, en las medidas que evalúan directamente las respuestas de ansiedad y en sus correlatos (asertividad, autoestima y adaptación). El grupo placebo también alcanza mejoras importantes en algunas de las variables mencionadas, mientras que el de transmisión de información no obtiene cambios significativos, exceptuando la variable autoestima. Palabras clave: fobia social generalizada, adolescentes, efectos específicos e inespecíficos, experimental.The aim of this study is to analyze the specific effects of the Intervention in Adolescents with Social Phobia (IAFS) program together with the nonspecific factors of the interventions used in the treatment of adolescents with social phobia (for example, characteristics of the patient or the therapist, expectations towards the treatment or the attention and support given by the (therapist). 77 adolescents were selected at random and randomly distributed between four experimental conditions: psychological treatment group (IAFS multicomponent package), transmission of information or educational group, placebo and waiting list control group. The results show the short- and medium-term effectiveness (12 months) of the IAFS according to specific measures assessing social anxiety and avoidance as well as other related constructs (assertiveness, social skills and adjustment). The placebo group achieved important improvements in some of the mentioned conditions, whereas that of information transmission did not obtained significant changes, with the exception of the self-esteem variable. Key words: generalized social phobia, adolescents, specific and nonspecific effects, experimental

Mechanical disassembly of human picobirnavirus like particles indicates that cargo retention is tuned by the RNA-coat protein interaction

Here we investigate the cargo retention of individual human picobirnavirus (hPBV) virus-like particles (VLPs) which differ in the N-terminal of their capsid protein (CP): (i) hPBV CP contains the full-length CP sequence; (ii) hPBV Δ45-CP lacks the first 45 N-terminal residues; and (iii) hPBV Ht-CP is the full-length CP with a N-terminal 36-residue tag that includes a 6-His segment. Consequently, each VLP variant holds a different interaction with the ssRNA cargo. We used atomic force microscopy (AFM) to induce and monitor the mechanical disassembly of individual hPBV particles. First, while Δ45-CP particles that lack ssRNA allowed a fast tip indentation after breakage, CP and Ht-CP particles that pack heterologous ssRNA showed a slower tip penetration after being fractured. Second, mechanical fatigue experiments revealed that the increased length in 8% of the N-terminal (Ht-CP) makes the virus particles to crumble ∼10 times slower than the wild type N-terminal CP, indicating enhanced RNA cargo retention. Our results show that the three differentiated N-terminal topologies of the capsid result in distinct cargo release dynamics during mechanical disassembly experiments because of the different interaction with RNAFIS2017-89549-R, FIS2017-90701-REDT, PID2021-126608OB-I00, PID2020-113287RB-I0

The planetary nebula IC 4776 and its post-common-envelope binary central star

We present a detailed analysis of IC 4776, a planetary nebula displaying a morphology believed to be typical of central star binarity. The nebula is shown to comprise a compact hourglass-shaped central region and a pair of precessing jet-like structures. Time-resolved spectroscopy of its central star reveals periodic radial velocity variability consistent with a binary system. While the data are insufficient to accurately determine the parameters of the binary, the most likely solutions indicate that the secondary is probably a low-mass main sequence star. An empirical analysis of the chemical abundances in IC 4776 indicates that the common-envelope phase may have cut short the AGB evolution of the progenitor. Abundances calculated from recombination lines are found to be discrepant by a factor of approximately two relative to those calculated using collisionally excited lines, suggesting a possible correlation between low abundance discrepancy factors and intermediate-period post-common-envelope central stars and/or Wolf-Rayet central stars. The detection of a radial velocity variability associated with binarity in the central star of IC 4776 may be indicative of a significant population of (intermediate-period) post-common-envelope binary central stars which would be undetected by classic photometric monitoring techniques.Comment: Accepted for publication in MNRA

Optimization of an urban rain gauge network utilizing different PCA-Variable identification techniques

"In order to study the effects of urban runoff, through numerical models and the design of waterworks, appropriate rainfall information needs to be gathered and analyzed. With this purpose a 27 rain gauge network has been deployed over the AMA. Here we present a principal component analysis (PCA) on daily rainfall data collected from June 2016 to December 2017 in order identify the stations that should be kept in place, given the objective of accurately capturing the spatial variability of rainfall over the Metropolitan Area of Asuncion."CONACYT - Consejo Nacional de Ciencias y TecnologíaPROCIENCI

Visual Semantic Navigation with Real Robots

Visual Semantic Navigation (VSN) is the ability of a robot to learn visual semantic information for navigating in unseen environments. These VSN models are typically tested in those virtual environments where they are trained, mainly using reinforcement learning based approaches. Therefore, we do not yet have an in-depth analysis of how these models would behave in the real world. In this work, we propose a new solution to integrate VSN models into real robots, so that we have true embodied agents. We also release a novel ROS-based framework for VSN, ROS4VSN, so that any VSN-model can be easily deployed in any ROS-compatible robot and tested in a real setting. Our experiments with two different robots, where we have embedded two state-of-the-art VSN agents, confirm that there is a noticeable performance difference of these VSN solutions when tested in real-world and simulation environments. We hope that this research will endeavor to provide a foundation for addressing this consequential issue, with the ultimate aim of advancing the performance and efficiency of embodied agents within authentic real-world scenarios. Code to reproduce all our experiments can be found at https://github.com/gramuah/ros4vsn