Capacidad antioxidante total y contenido de polifenoles de vinos argentinos

Existe evidencia sobre los beneficios del consumo de dietas ricas en frutas y vegetales y una moderada cantidad de vinos tintos en situaciones de salud asociadas a la producción de riesgo oxidativo. Estos efectos protectores se atribuyen a la presencia en los alimentos citados de compuestos con actividad antioxidante, particularmente los polifenoles. En los vinos, los principales compuestos fenólicos son los ácidos galico y cafeico, epicatequina, catequina, cianidina y malvidina-3-glucósidos, rutina, miricetina, quercetina y resveratrol. La Argentina posee regiones muy aptas para la producción vitivinícola siendo el vino obtenido de la Vitis vinifera var. Malbec, uno de los más representativos del país. En la zona del Rio de La Plata y particularmente en Berisso se cultiva la Vitis labrusca var. Isabela de la cual se obtienen el denominado vino de la costa (VC). Existe escasa evidencia sobre la capacidad antioxidante total (CAT) de los vinos Malbec argentinos producidos en diferentes regiones y prácticamente ninguna sobre el vino de la costa. Objetivos: Como parte de un proyecto general del estudio de la capacidad antioxidante de productos naturales, en este trabajo se evalúa la CAT y el contenido de fenoles totales de vinos Malbec de 4 regiones vitivinícolas argentinas y del VC de Berisso utilizando diferentes modelos experimentales

Model-Based Fault Detection and Identification for Prognostics of Electromechanical Actuators Using Genetic Algorithms

Traditional hydraulic servomechanisms for aircraft control surfaces are being gradually replaced by newer technologies, such as Electro-Mechanical Actuators (EMAs). Since field data about reliability of EMAs are not available due to their recent adoption, their failure modes are not fully understood yet; therefore, an effective prognostic tool could help detect incipient failures of the flight control system, in order to properly schedule maintenance interventions and replacement of the actuators. A twofold benefit would be achieved: Safety would be improved by avoiding the aircraft to fly with damaged components, and replacement of still functional components would be prevented, reducing maintenance costs. However, EMA prognostic presents a challenge due to the complexity and to the multi-disciplinary nature of the monitored systems. We propose a model-based fault detection and isolation (FDI) method, employing a Genetic Algorithm (GA) to identify failure precursors before the performance of the system starts being compromised. Four different failure modes are considered: dry friction, backlash, partial coil short circuit, and controller gain drift. The method presented in this work is able to deal with the challenge leveraging the system design knowledge in a more effective way than data-driven strategies, and requires less experimental data. To test the proposed tool, a simulated test rig was developed. Two numerical models of the EMA were implemented with different level of detail: A high fidelity model provided the data of the faulty actuator to be analyzed, while a simpler one, computationally lighter but accurate enough to simulate the considered fault modes, was executed iteratively by the GA. The results showed good robustness and precision, allowing the early identification of a system malfunctioning with few false positives or missed failures.https://susy.mdpi

Climatic constraints on the biogeographic history of Mesozoic dinosaurs

Dinosaurs dominated Mesozoic terrestrial ecosystems globally. However, whereas a pole-to-pole geographic distribution characterized ornithischians and theropods, sauropods were restricted to lower latitudes. Here, we evaluate the role of climate in shaping these biogeographic patterns through the Jurassic–Cretaceous (201–66 million years ago), combining dinosaur fossil occurrences, past climate data from Earth System models, and habitat suitability modelling. Results show that uniquely among dinosaurs, sauropods occupied climatic niches characterised by high temperatures and strongly bounded by minimum cold temperatures. This constrained the distribution and dispersal pathways of sauropods to tropical areas, excluding them from latitudinal extremes, especially in the Northern Hemisphere. The greater availability of suitable habitat in the southern continents, particularly in the Late Cretaceous, might be key to explaining the high diversity of sauropods there, relative to northern landmasses. Given that ornithischians and theropods show a flattened or bimodal latitudinal biodiversity gradient, with peaks at higher latitudes, the closer correspondence of sauropods to a subtropical concentration could hint at fundamental thermophysiological differences to the other two clades

Detection of solar-like oscillations in the G5 subgiant mu-Herculis

A clear detection of excess of power, providing a substantial evidence for solar-like oscillations in the G5 subgiant \muher{}, is presented. This star was observed over seven nights with the SARG echelle spectrograph operating with the 3.6-m Italian TNG Telescope, using an iodine absorption cell as a velocity reference. A clear excess of power centered at 1.2 mHz, with peak amplitudes of about 0.9 \ms in the amplitude spectrum is present. Fitting the asymptotic relation to the power spectrum, a mode identification for the $\ell=0,1,2,3$ modes in the frequency range 900-1600 \muHz is derived. The most likely value for the large separation turns out to be 56.5 \muHz, consistent with theoretical expectations. The mean amplitude per mode ($l=0,1$) at peak power results to be $0.63 \rm m s^{-1}$, almost three times larger than the solar one.Comment: 8 pages, 6 figures, ApJ to appea

Deep lobe parotidectomy—why, when, and how?

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Implementation of Life Cycle Assessment on Tempeh Production at “Tempe Ibu Sujati”, Yogyakarta

Tempeh is one of Indonesian traditional food that have been favored by the locals for centuries. Tempeh has a life cycle from the supply of raw materials, production processes, packaging and transportation that have a potential impact on the environment. In this study Life Cycle Assessment (LCA) is used as a tool to evaluate the environmental impact on Global Warming Potential (GMP). The LCA study will be conducted in tempeh industry “Ibu Sujati” located at Pandean Street, Umbulharjo, Yogyakarta. The LCA study will be focused on the energy consumption in production process, including the raw material transportation . The result showed the boiling process which part of production process has the largest GWP value that equals to 0.488388 kg CO2-eq which contributes 78.79% of the total GWP in the system boundaries

A Class of Renormalization Group Invariant Scalar Field Cosmologies

We present a class of scalar field cosmologies with a dynamically evolving Newton parameter $G$ and cosmological term $\Lambda$. In particular, we discuss a class of solutions which are consistent with a renormalization group scaling for $G$ and $\Lambda$ near a fixed point. Moreover, we propose a modified action for gravity which includes the effective running of $G$ and $\Lambda$ near the fixed point. A proper understanding of the associated variational problem is obtained upon considering the four-dimensional gradient of the Newton parameter.Comment: 10 pages, RevTex4, no figures, to appear on GR

The Accelerated expansion of the Universe as a crossover phenomenon

We show that the accelerated expansion of the Universe can be viewed as a crossover phenomenon where the Newton constant and the Cosmological constant are actually scaling operators, dynamically evolving in the attraction basin of a non-Gaussian infrared fixed point, whose existence has been recently discussed. By linearization of the renormalized flow it is possible to evaluate the critical exponents, and it turns out that the approach to the fixed point is ruled by a marginal and a relevant direction. A smooth transition between the standard Friedmann--Lemaitre--Robertson--Walker (FLRW) cosmology and the observed accelerated expansion is then obtained, so that $\Omega_M \approx \Omega_\Lambda$ at late times.Comment: 12 pages, latex, use bibtex. In the final version, the presentation has been improved, and new references have been adde

Dynamical System Analysis of Cosmologies with Running Cosmological Constant from Quantum Einstein Gravity

We discuss a mechanism that induces a time-dependent vacuum energy on cosmological scales. It is based on the instability induced renormalization triggered by the low energy quantum fluctuations in a Universe with a positive cosmological constant. We employ the dynamical systems approach to study the qualitative behavior of Friedmann-Robertson-Walker cosmologies where the cosmological constant is dynamically evolving according with this nonperturbative scaling at low energies. It will be shown that it is possible to realize a "two regimes" dark energy phases, where an unstable early phase of power-law evolution of the scale factor is followed by an accelerated expansion era at late times.Comment: 26 pages, 4 figures. To appear in New Journal of Physic