Comprobación de las leyes de Kirchhoff para alterna

Fil: Farias de la Torre, E. Universidad Tecnológica Nacional – Facultad Regional Córdoba; Argentina.Fil: Farias de la Torre, E. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.Fil: Ricón, R. Universidad Tecnológica Nacional – Facultad Regional Córdoba; Argentina.Fil: Boglione, S. Universidad Tecnológica Nacional – Facultad Regional Córdoba; Argentina.Fil: Montaño, J. Universidad Tecnológica Nacional – Facultad Regional Córdoba; Argentina.Fil: Mlina, E. Universidad Tecnológica Nacional – Facultad Regional Córdoba; Argentina.Fil: Silveira, R. Universidad Tecnológica Nacional – Facultad Regional Córdoba; Argentina.Fil: Zacco, F. Universidad Tecnológica Nacional – Facultad Regional Córdoba; Argentina.A partir de un circuito básico de dos mallas con elementos resistivos, inductivos y capacitivos, adecuadamente elegidos, se muestra la comprobación de las leyes de Kirchhoff de tensión y corriente para alterna. La adquisición y procesamiento de los datos, como así también la presentación de los resultados hace que la propuesta signifique un aporte didáctico desde lo experimental y para la enseñanza del tema.http://www.latindex.orgFil: Farias de la Torre, E. Universidad Tecnológica Nacional – Facultad Regional Córdoba; Argentina.Fil: Farias de la Torre, E. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.Fil: Ricón, R. Universidad Tecnológica Nacional – Facultad Regional Córdoba; Argentina.Fil: Boglione, S. Universidad Tecnológica Nacional – Facultad Regional Córdoba; Argentina.Fil: Montaño, J. Universidad Tecnológica Nacional – Facultad Regional Córdoba; Argentina.Fil: Mlina, E. Universidad Tecnológica Nacional – Facultad Regional Córdoba; Argentina.Fil: Silveira, R. Universidad Tecnológica Nacional – Facultad Regional Córdoba; Argentina.Fil: Zacco, F. Universidad Tecnológica Nacional – Facultad Regional Córdoba; Argentina.Otras Ciencias Física

Integrated management of ash from industrial and domestic combustion : a new sustainable approach for reducing greenhouse gas emissions from energy conversion

This work supports, for the first time, the integrated management of waste materials arising from industrial processes (fly ash from municipal solid waste incineration and coal fly ash), agriculture (rice husk ash), and domestic activities (ash from wood biomass burning in domestic stoves). The main novelty of the paper is the reuse of wood pellet ash, an underestimated environmental problem, by the application of a new technology (COSMOS-RICE) that already involves the reuse of fly ashes from industrial and agricultural origins. The reaction mechanism involves carbonation: this occurs at room temperature and promotes permanent carbon dioxide sequestration. The obtained samples were characterized using XRD and TGA (coupled with mass spectroscopy). This allowed quantification of the mass loss attributed to different calcium carbonate phases. In particular, samples stabilized using wood pellet ash show a weight loss, attributed to the decomposition of carbonates greater than 20%. In view of these results, it is possible to conclude that there are several environmental benefits from wood pellet ash reuse in this way. In particular, using this technology, it is shown that for wood pellet biomass the carbon dioxide conversion can be considered negative

Lovastatin Modulates Glycogen Synthase Kinase-3β Pathway and Inhibits Mossy Fiber Sprouting after Pilocarpine-Induced Status Epilepticus

This study was undertaken to assay the effect of lovastatin on the glycogen synthase kinase-3 beta (GSK-3β) and collapsin responsive mediator protein-2 (CRMP-2) signaling pathway and mossy fiber sprouting (MFS) in epileptic rats. MFS in the dentate gyrus (DG) is an important feature of temporal lobe epilepsy (TLE) and is highly related to the severity and the frequency of spontaneous recurrent seizures. However, the molecular mechanism of MFS is mostly unknown. GSK-3β and CRMP-2 are the genes responsible for axonal growth and neuronal polarity in the hippocampus, therefore this pathway is a potential target to investigate MFS. Pilocarpine-induced status epilepticus animal model was taken as our researching material. Western blot, histological and electrophysiological techniques were used as the studying tools. The results showed that the expression level of GSK-3β and CRMP-2 were elevated after seizure induction, and the administration of lovastatin reversed this effect and significantly reduced the extent of MFS in both DG and CA3 region in the hippocampus. The alteration of expression level of GSK-3β and CRMP-2 after seizure induction proposes that GSK-3β and CRMP-2 are crucial for MFS and epiletogenesis. The fact that lovastatin reversed the expression level of GSK-3β and CRMP-2 indicated that GSK-3β and CRMP-2 are possible to be a novel mechanism of lovatstain to suppress MFS and revealed a new therapeutic target and researching direction for studying the mechanism of MFS and epileptogenesis

Testing of an Enertun segment prototype in Turin metro line 1

Since the 1980s, a number of underground geotechnical structures have been turned into heat exchangers, the so-called energy geostructures, by embedding absorber pipes in their concrete mass. A carrier fluid circulating along the pipes extracts or injects heat from or into the ground with the aim of conditioning buildings. A novel energy tunnel precast seg- mental lining was patented at Politecnico di Torino in 2016. Compared to previous configur- ations, this patent suggests an innovative and more efficient layout of the net of pipes. The South Extension of Turin Metro Line 1 represented an extraordinary opportunity to test the novel energy segment. This paper is intended to describe the experimental site setup, by outlin- ing the operation modes and the experimental campaign carried out. A preliminary coupled thermo-hydraulic, finite-element numerical analysis was also developed with the intention of performing a comparison with the experimental measurements

A circular economy virtuous example-use of a stabilized waste material instead of calcite to produce sustainable composites

This work reports and analyzes the mechanical properties of some composites obtained using stabilized waste with epoxy resins E-227. For comparison, correspondent composite samples were realized using calcite as a filler. The recovered stabilized waste was obtained by means of a new method to stabilize municipal solid waste incineration (MSWI) fly ash (FA), based on the use of bottom ash (BA). The aim of this paper is to show that the stabilization process, which can be considered a zero-waste treatment, produces inert materials, that can be reused as a filler. The production of new filler was made on a pilot plant, designed to verify the transferability of the proposed stabilization technology. Mechanical analysis revealed that flexural modulus raises by increasing the filler content around 30% wt, independently of filler type, stabilized sample or calcium carbonate. Mechanical properties are lower in the samples with the high amount of filler due to the crowding effect. The morphology of composite materials showed a non-homogeneous dispersion of particles in stabilized sample filler, characterized by large particle agglomerates. Finally, according to the ESCAPE simplified method, the obtained composites result more sustainable in comparison with the corresponding ones produced by using natural resources (like calcite). These findings open new possibilities for the reuse of the stabilized material, in frame of circular economy principles, with environmental and economic advantage

Extraordinary optical transmission in one-dimensional gold gratings: near- and far-field analysis

One-dimensional arrays of nanoslits fabricated on silicon nitride membranes show extraordinary optical transmission. Optical characterization techniques have been used to characterize the transmission spectra and the near-field optical configuration. Experimental results have been compared with numerical simulations in order to elucidate the different modes of light propagation. Near- and far-field optical distribution is studied as a function of the polarization of light. (c) 2011 Optical Society of Americ