O JORNALISMO DIGITAL NAS REDES SOCIAIS: CARACTERÍSTICAS E NOVAS ESTRATÉGIAS PARA A IMPRENSA ATUAL

In the era of digital communication, social networks have significantly transformed the way news is produced, disseminated and consumed, and have become an essential tool for the work of journalists. Today, platforms such as Facebook, Instagram and Twitter offer the possibility of interacting directly with the public, obtaining immediate feedback and creating content in new formats and disseminating it virally. The objective of this article is to explore different strategies that journalistic media use in their social networks to generate information and connect with readers. For this purpose, a methodology based on a descriptive method and on the analysis of informative content is used. It is concluded that the strategies used seek speed in the publication of news, constant interaction with the audience and the production of attractive multimedia content to improve the news experience of readers.  En la era de la comunicación digital, las redes sociales han transformado significativamente la forma de producir, distribuir y consumir contenidos informativos convirtiéndose en una herramienta imprenscindible para el ejercicio de la práctica periodística. En la actualidad, plataformas como Facebbok, Instagram y Twitter ofrecen un espacio donde los periodistas pueden interactuar directamente con su audiencia, obtener retroalimentación instantánea, producir contenidos en formatos atractivos e innovadores y difundir noticias de una manera viral. Este artículo pretende explorar algunas estrategias de innovación periodística asociadas al uso de las redes sociales para la generación de contenidos informativos y la interacción con las audiencias. Para ello, se utiliza una metodología basada en un enfoque descriptivo y en el análisis de contenido informativo. Se concluye que las estrategias utilizadas por los periodistas en las redes sociales buscan la inmediatez en la difusión de las noticias, la interacción constante con su audiencia y la elaboración de contenidos multimedia atractivos para enriquecer la experiencia informativa de sus lectores.Na era da comunicação digital, as redes sociais transformaram significativamente a maneira de produzir, distribuir e consumir conteúdo informativo, tornando-se uma ferramenta indispensável para a prática jornalística. Atualmente, plataformas como o Facebook, Instagram e Twitter oferecem um espaço onde os jornalistas podem interagir diretamente com seu público, obter feedback instantâneo, produzir conteúdo em formatos atraentes e inovadores e disseminar notícias de maneira viral. Este artigo pretende explorar algumas estratégias de inovação jornalística associadas ao uso das redes sociais para a geração de conteúdo informativo e interação com as audiências. Para isso, é utilizada uma metodologia baseada em uma abordagem descritiva e na análise de conteúdo informativo. Conclui-se que as estratégias utilizadas pelos jornalistas nas redes sociais buscam a imediatidade na divulgação das notícias, a interação constante com seu público e a criação de conteúdo multimídia atraente para enriquecer a experiência informativa de seus leitores

CONAE MicroWave Radiometer (MWR) Counts to Brightness Temperature Algorithm

This dissertation concerns the development of the MicroWave Radiometer (MWR) brightness temperature (Tb) algorithm and the associated algorithm validation using on-orbit MWR Tb measurements. This research is sponsored by the NASA Earth Sciences Aquarius Mission, a joint international science mission, between NASA and the Argentine Space Agency (Comision Nacional de Actividades Espaciales, CONAE). The MWR is a CONAE developed passive microwave instrument operating at 23.8 GHz (K-band) H-pol and 36.5 GHz (Ka-band) H- and V-pol designed to complement the Aquarius L-band radiometer/scatterometer, which is the prime sensor for measuring sea surface salinity (SSS). MWR measures the Earth\u27s brightness temperature and retrieves simultaneous, spatially collocated, environmental measurements (surface wind speed, rain rate, water vapor, and sea ice concentration) to assist in the measurement of SSS. This dissertation research addressed several areas including development of: 1) a signal processing procedure for determining and correcting radiometer system non-linearity; 2) an empirical method to retrieve switch matrix loss coefficients during thermal-vacuum (T/V) radiometric calibration test; and 3) an antenna pattern correction (APC) algorithm using Inter-satellite radiometric cross-calibration of MWR with the WindSat satellite radiometer. The validation of the MWR counts-to-Tb algorithm was performed using two years of on-orbit data, which included special deep space calibration measurements and routine clear sky ocean/land measurements

Mathematical and numerical modelling of soiling effects of photovoltaic solar panels on their electrical performance

With time, the photovoltaic solar panels naturally soiled from dust and other elements. These soils prevent light to reach solar cell and can reduce the long-term profitability. The study demonstrates the soiling effect on the electrical characteristics of panels, productivity and performance. A model simulation was developed in this direction in order to quantify and compare the performance of clean and dirty panels, the dust particles have been considered as spheres with an elliptical shadow on the panel. The results prove a power loss of 40% of a 0,224 mg/cm2 dust deposition in comparison with a clean panel at the maximum operating point MPP. This study describes the identified critical parameters governing the fouling of the PV panels

Beta-Blocker Use Is Associated With Impaired Left Atrial Function in Hypertension

BACKGROUND: Impaired left atrial (LA) mechanical function is present in hypertension and likely contributes to various complications, including atrial arrhythmias, stroke, and heart failure. Various antihypertensive drug classes exert differential effects on central hemodynamics and left ventricular function. However, little is known about their effects on LA function. METHODS AND RESULTS: We studied 212 subjects with hypertension and without heart failure or atrial fibrillation. LA strain was measured from cine steady-state free-precession cardiac MRI images using feature-tracking algorithms. In multivariable models adjusted for age, sex, race, body mass index, blood pressure, diabetes mellitus, LA volume, left ventricular mass, and left ventricular ejection fraction, beta-blocker use was associated with a lower total longitudinal strain (standardized beta=-0.21; P=0.008), and lower LA expansion index (standardized beta=-0.30; P \u3c 0.001), indicating impaired LA reservoir function. Beta-blocker use was also associated with a lower positive strain (standardized beta=-0.19; P=0.012) and early diastolic strain rate (standardized beta=0.15; P=0.039), indicating impaired LA conduit function. Finally, beta-blocker use was associated with a lower (less negative) late-diastolic strain (standardized beta=0.15; P=0.049), strain rate (standardized beta=0.18; P=0.019), and a lower active LA emptying fraction (standardized beta=-0.27; P\u3c 0.001), indicating impaired booster pump function. Use of other antihypertensive agents was not associated with LA function. CONCLUSIONS: Beta-blocker use is significantly associated with impaired LA function in hypertension. This association could underlie the increased risk of atrial fibrillation and stroke seen with the use of beta-blockers (as opposed to other antihypertensive agents) demonstrated in recent trials