La computación electrónica aplicada a la selección de los aceros

El presente trabajo tiene por objeto demostrar cómo, mediante la utilización de "una computadora electrónica, y aplicando ciertos principios técnico-científicos, se puede llegar a establecer una equivalencia entre los aceros al carbono y aleados destinados a la construcción mecánica. Para ello se ha adoptado el criterio de tres parámetros fundamentales: (Di) diámetro crítico ideal, (Ms) temperatura de transformación austenítica-mar-tensítica, y (Hr) dureza a distintas temperaturas y tiempos de revenido. Luego de un estudio crítico del sistema de equivalencia, se presentan las tablas de valores obtenidas por la computadora electrónica y se analiza la trascendencia de estas determinaciones.The purpose of the present report is to demonstrate how employing and electronic computer and certain technical-scientifical principles, it is possible to establish an equivalence between carbon and alloy steels used in mechanical constructions. To accomplish this objective it was adopted the criterium of three fundamental parameters: (Dl) ideal critical diameter, (Ms) transformation temperature austenite martensite and (Hr) hardness corresponding to different temperatures and tempering times. After a critical study of the equivalence system, tables and values obtained by electronic computer are shown and the importance of these determinations are analyzed

Enanismo y podredumbre basal de Eustoma grandiflorum y su relación con la densidad de Fusarium solani en el suelo

En cultivos comerciales de lisianthus de La Plata y alrededores (Argentina), se observó que Fusarium solani afecta al 100% de los establecimientos productivos provocando enanismo y podredumbre basal. Se realizó un ensayo para analizar la densidad de F. solani del suelo bajo el efecto de distintos tratamientos y relacionarla con la evolución de ambas patologías. Los análisis del suelo se hicieron en 3 épocas: antes del transplante (octubre), al inicio (enero) y al final (marzo) de la floración. En enero y marzo se evaluó la incidencia de cada enfermedad y se cuantificaron las plantas cosechadas. La población de F. solani no varió en las 3 épocas y se redujo significativamente con los fumigantes y el vapor. Esto determinó una incidencia del enanismo (enero) de 0 a 9,5% con los primeros y de 31,4% con el vapor. Para el testigo y los fungicidas la incidencia varió entre el 87,9 y el 100%, disminuyendo las plantas cosechadas. La podredumbre basal comenzó con el ingreso del patógeno a través de las heridas producidas por la cosecha. Ésta fue significativamente mayor con los fumigantes (90,7 a 99%) y también con el vapor (76,8%), produciéndose la mayor incidencia en marzo (15,7 a 22,2 y 10,1% respectivamente), reduciéndose el período productivo. Se destaca la importancia de disminuir la densidad de F. solani en el momento del transplante. Entre los métodos de control el Metam sodio y Dazomet podrían ser eficaces sustitutos del Bromuro de metilo, seguidos por el vapor.Fusarium solani was recorded in 100% of the commercial crops of lisianthus (Eustoma grandiflorum) located around La Plata (Argentina). The pathogen causes stunt and basal rot. A trial was carried out to analyse the F. solani soil density and its relation to the development of both diseases. Soil samples were analysed at three times: before transplant (October), at the beginning of flowering (January) and at the ending of flowering (March) of flowering. The incidence of each disease was evaluated in January and March, and the plants harvested were quantified. The soil density of F. solani was not altered during the three times for each treatment, and fumigants and steam decrease it significantly. In January the stunt incidence reached 0 to 9.5% with the fumigants and 31.4% with the steam treatment. In the control and fungicide plots, the incidence reached 87.9 to 100%, and a consequent reduction of flower production was observed. Stem rot began after the flowers were harvested as a result of pathogen entry through the wounds. The major values of harvested plants were obtained with fumigants (90.7 to 99%) and steam (76.8%), so the greatest stem rot incidence was 15.7 to 22.2 and 10.1%, respectively, in March, and the productive period was shortened. The need of reducing F. solani soil density before lisianthus transplant is emphasized. Among soil control treatments, Metham sodium and Dazomet could be effective substitutes for Methil bromide followed by steam treatment

Asymptotic behaviour of a semilinear elliptic system with a large exponent

Consider the problem \begin{eqnarray*} -\Delta u &=& v^{\frac 2{N-2}},\quad v>0\quad {in}\quad \Omega, -\Delta v &=& u^{p},\:\:\:\quad u>0\quad {in}\quad \Omega, u&=&v\:\:=\:\:0 \quad {on}\quad \partial \Omega, \end{eqnarray*} where $\Omega$ is a bounded convex domain in $\R^N,$ $N>2,$ with smooth boundary $\partial \Omega.$ We study the asymptotic behaviour of the least energy solutions of this system as $p\to \infty.$ We show that the solution remain bounded for $p$ large and have one or two peaks away form the boundary. When one peak occurs we characterize its location.Comment: 16 pages, submmited for publicatio

Modeling Watershed Response in Semiarid Regions With High-Resolution Synthetic Aperture Radars

In this paper, we propose a methodology devoted to exploit the outstanding characteristics of COSMO-SkyMed for monitoring water bodies in semiarid countries at a scale never experienced before. The proposed approach, based on appropriate registration, calibration, and processing of synthetic aperture radar (SAR) data, allows outperforming the previously available methods for monitoring small reservoirs, mainly carried out with optical data, and severely limited by the presence of cloud coverage, which is a frequent condition in wet season. A tool has been developed for computing the water volumes retained in small reservoirs based on SAR-derived digital elevation model. These data have been used to derive a relationship between storage volumes and surface areas that can be used when bathymetric information is unavailable. Due to the lack of direct measures of river's discharge, the time evolution of water volumes retained at reservoirs has been used to validate a simple rainfall-runoff hydrological model that can provide useful recommendation for the management of small reservoirs. Operational scenarios concerning the improvement in the efficiency of reservoirs management and the estimation of their impact on downstream area point out the applicative outcomes of the proposed method

PATRIMÔNIO ESPORTIVO IMATERIAL. DO MUNDIAL AO MUNICIPAL: O TOMBAMENTO DO “BOLA PESADA” EM NITERÓI

esta pesquisa analisa e identifica diferenças e similaridades entre os processos de patrimonialização das práticas esportivas do Hurling (UNESCO, 2018) e do Bola Pesada (Niterói, RJ, 2015). Objetiva estabelecer e ressaltar a estreita relação entre a patrimonialização dos bens imateriais do patrimônio esportivo e sua salvaguarda. Por meio de pesquisa documental e de visitas técnicas, traça um comparativo entre os processos estabelecidos pela UNESCO e pelo município de Niterói, sob o prisma de suas motivações e da documentação apresentada frente às exigências e às diferentes metodologias adotadas por cada uma dessas instâncias. Conclui que o mero decreto de um bem como patrimônio não irá atingir o objetivo maior da patrimonialização: a salvaguarda e a transmissão futura deste patrimônio cultural