Information activity in digital media: will print newspapers survive without advertising?

La crisis ha acelerado el proceso de digitalización en la prensa impresa. Las TIC han transformado el sistema informativo, tanto económica, como productivamente. El descenso dramático en ingresos publicitarios hace tambalearse el vigente modelo de negocio de las empresas informativas. Necesitamos nuevas vías de financiación, que permitan subsistir a los medios. Existen nuevos modelos de sistemas para conseguir dar rentabilidad a la actividad informativa: desde el crowdfunding, hasta el e-commerce, apoyado en sus audiencias, y otros. Todo eso nos hace cuestionarnos el futuro de los medios informativos, tal y como han sido entendidos hasta ahora, en cuanto empresas.This crisis has accelerated printed press’ process to become online. ICT have transformed the information system both economically and productively. The dramatic decline in advertising revenues shakes the business model followed so far by media companies. We need new ways of financing, to allowe media survive. There are cases of new systems adopted for information activity to obtain profitability: from crowdfunding to ecommerce, supported in media audiences. All this makes us question the future of the media, in the way as they have been understood as information companies untill now

On Tubular vs. Swung surfaces

We determine necessary and sufficient conditions for a tubular surface to be swung, and viceversa. From these characterizations, we derive two symbolic algorithms. The first one decides whether a given implicit equation, of a tubular surface, admits a swung parametrization and, in the affirmative case, it outputs such a parametrization. The second one decides whether a given swung surface parametrization is a tubular surface and, in the affirmative case, it outputs the implicit equation

Reparametrizing Swung Surfaces over the Reals

Let K⊆R be a computable subfield of the real numbers (for instance, Q). We present an algorithm to decide whether a given parametrization of a rational swung surface, with coefficients in K(i), can be reparametrized over a real (i.e., embedded in R) finite field extension of K. Swung surfaces include, in particular, surfaces of revolution

Estrategias y perspectivas documentales en la información digital

La información digital es ya una realidad y la creación de este tipo de información es cada vez mayor, por lo que se hace necesario un control, un análisis y una gestión; y en este trabajo se proponen fórmulas para entender la información digital y sus características. La documentación hace posible el seguimiento y el estudio del proceso documental aplicado a las informaciones que facilitan los medios de comunicación, que aportan los elementos informativos necesarios para crear fondos documentales con sus noticias. Por su parte, el lector, se constituye en elemento creativo de la información, aportando su experiencia personal

Uso de herramientas online para incentivar los debates y reflexiones de las y los estudiantes de forma presencial y/o online

Depto. de Trabajo Social y Servicios SocialesFac. de Trabajo SocialFALSEsubmitte

Dietary glycemic index and retinal microvasculature in adults: a cross-sectional study

[EN] Objective: To analyze the relationship between dietary glycemic index (GI) and retinal microvasculature in adults. Methods: This was a cross-sectional study of 300 subjects from the EVIDENT II study. Dietary GI was calculated using a validated, semi-quantitative food frequency questionnaire. Retinal photographs were digitized, temporal vessels were measured in an area 0.5–1 disc diameter from the optic disc and arteriolar-venular index (AVI) was estimated with semi-automated software. Results: AVI showed a significant difference between the tertiles of GI, after adjusting for potential confounders. The lowest AVI values were observed among subjects in the highest tertile of GI, whereas the greatest were found among those in the lowest tertile (estimated marginal mean of 0.738 vs. 0.768, p = 0.014). Conclusions: In adults, high dietary GI implies lowering AVI values regardless of age, gender and other confounding variables. Trial registration: Clinical Trials.gov Identifier: NCT02016014. Registered 9 December 2013

Distribución espacial y temporal de polvo mineral atmosférico en el norte de África y Oriente medio estimada a partir de la visibilidad horizontal

El polvo mineral atmosférico desempeña un papel muy importante en la atmósfera por su interacción con el balance radiativo y con la microfísica de nubes. África Septentrional es la mayor fuente de polvo mineral en el mundo. Sin embargo, carece de sistemas de observación desde tierra adecuados y la información desde satélite es muy limitada debido a la alta reflectividad del suelo. Por ello, se valora la posibilidad de usar la visibilidad horizontal observada en las estaciones meteorológicas como una forma indirecta de estimar el contenido de polvo en la atmósfera al nivel de la superficie. En este trabajo se utilizan observaciones de visibilidad para analizar la distribución geográfica de polvo mineral en África Septentrional y Oriente Medio, así como su variabilidad estacional. Posteriormente, se estudia la relación entre visibilidad y la concentración de partículas y se halla una relación empírica entre ambas magnitudes que es comparada con otras relaciones similares deducidas por otros autores.Postprint (published version

Relationship between intima-media thickness of the common carotid artery and arterial stiffness in subjects with and without type 2 diabetes: a case-series report

Background: We examined the relationship between the intima-media thickness of the common carotid artery (CCA-IMT) and arterial stiffness, assessed by pulse wave velocity (PWV), the ambulatory arterial stiffness index (AASI) and the augmentation index (AIx) in subjects with and without type 2 diabetes. Methods: A case-series study was made in 366 patients (105 diabetics and 261-non-diabetics). Ambulatory blood pressure monitoring was performed on a day of standard activity with the SpaceLabs 90207 system. AASI was calculated as "1-slope" from the within-person regression of diastolic-on-systolic ambulatory blood pressure readings. PWV and AIx were measured with the SphygmoCor system, and a Sonosite Micromax ultrasound unit was used for automatic measurements of CCA-IMT. Results: PWV, AASI and CCA-IMT were found to be greater in diabetic patients, while no differences in AIx were observed between the two groups. CCA-IMT was independently correlated to the three measures of arterial stiffness in both groups. We found an increase in CCA-IMT of 0.40, 0.24 and 0.36 mm in diabetics, and of 0.48, 0.17 and 0.55 mm in non-diabetics for each unit increase in AASI, AIx and PWV. The variability of CCA-IMT was explained mainly by AASI, AIx and gender in diabetic patients, and by age, gender, AASI and PWV in non-diabetic patients. Conclusions: CCA-IMT showed a positive correlation to PWV, AASI and AIx in subjects with and without type 2 diabetes. However, when adjusting for age, gender and heart rate, the association to PWV was lost in diabetic patients, in the same way as the association to Alx in non-diabetic patients. The present study demonstrates that the three measures taken to assess arterial stiffness in clinical practice are not interchangeable, nor do they behave equally in all subjects

Association between smoking status and the parameters of vascular structure and function in adults : results from the EVIDENT study

Background: The present study analyses the relation between smoking status and the parameters used to assess vascular structure and function. Methods: This cross-sectional, multi-centre study involved a random sample of 1553 participants from the EVIDENT study. Measurements: The smoking status, peripheral augmentation index and ankle-brachial index were measured in all participants. In a small subset of the main population (265 participants), the carotid intima-media thickness and pulse wave velocity were also measured. Results: After controlling for the effect of age, sex and other risk factors, present smokers have higher values of carotid intima-media thickness (p = 0.011). Along the same lines, current smokers have higher values of pulse wave velocity and lower mean values of ankle-brachial index but without statistical significance in both cases. Conclusions: Among the parameters of vascular structure and function analysed, only the IMT shows association with the smoking status, after adjusting for confounders

Proyecto colaborativo para la génesis de un banco de imágenes aplicable a la docencia sobre archivos y bibliotecas (ARBIFOTO)

Realización de fotografías de las bibliotecas de la UCM para uso en docencia e investigación