404 research outputs found
Mutamenti tecnologici e strutturali nell’industria siderurgica mondiale. Un modello altamente innovativo
No full textFuel cell based distributed generation feeding electrical and thermal loads
No full textThe progressive deregulamentation of the electrical energy market, together with the incentive to use zero emission energy sources, can encourage, in the middle term, the diffusion of generation sites dispersed on the territory. The utilization of cogeneration in civil and industrial installation and the technological progress associated to small and medium size systems involve increasing requests of linking to the LV and MV distribution grid, which modifies itself from “passive” to “active”. Fuel Cell based electrical distributed sources, suitable to feed also thermal requirements, make the distribution utilities able to satisfy the customer requirements in terms of electrical and thermal loads, creating the opportunities to reconfigure the relation among producer, distributor and customer. The paper focuses on the performances of fuel cell sources and on their integration in the distribution networks, examining the benefits that fuel cell sources could determine on system potentialities in terms of technical and reliability aspects
[Local immunity in the urine of subjects affected with cystitis caused by Escherichia coli, Proteus vulgaris or Serratia marcescens].
No full textFerriello F., Formisano G., Paparo R., De Martino M., Frusciante L.,Ercolano M.R. Molecular Marker Assisted Selection To Introduce Disease Resistance Genes In Traditional Tomato Varieties. Poster Abstact A 30 /Proceedings Of The 52nd Italian Society Of Agricultural Genetics Annual Congress Padova, Italy 14/17 September, 2008 /Isbn 978-88-900622-8-5
No full textThe Scientific Historical Heritage in the Physics Museum of the University of Naples: A guided tour of the Collection is offered to visitors, providing the characteristics of individual instruments of historical interest
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Optical second harmonic generation from LaAlO3/SrTiO3 interfaces with different in-plane anisotropies
No full textOxide growth with semiconductor-like accuracy allows the fabrication of atomically precise thin films and interfaces displaying a wide range of phases and functionalities that are absent in the corresponding oxide bulk materials. Among the other properties it was found that a two-dimensional electronic gas is formed under some circumstances at the LaAlO3/SrTiO3(0 0 1) interface separating two typical insulating perovskite crystals. The origin of this conducting state has been discussed at length, since different doping mechanisms can act in these material systems. Many experimental results point to the so-called polar catastrophe scenario as the principal mechanism driving the formation of the two-dimensional electronic gas. According to this mechanism, the existence of an interfacial polar discontinuity is the key ingredient to drive an electronic reconstruction at the LaAlO3/SrTiO3(0 0 1) interface and the consequent formation of a two-dimensional electron gas. This simple picture has been often questioned by the existence of material systems whose interface are predicted being non-polar according to the simplistic 'ionic' limit but that display an electrical behavior analogous to that of LaAlO3/SrTiO3(0 0 1) interfaces. This is the case of the LaAlO3/SrTiO3(1 1 0), i.e., a LaAlO3/SrTiO3 interface with a different in-plane orientation. It is evident that to solve such kind of controversies a detailed investigation of the polar or non-polar state of these interfaces is needed, although this is not simple for the lack of experimental tools that are specifically sensitive to interfacial polarity. Here we apply Optical Second Harmonic Generation to investigate LaAlO3/SrTiO3 interfaces with different in-plane orientations to bridge this gap. By comparing our results with recent theoretical findings, we will arrive to the conclusion that the real LaAlO3/SrTiO3(1 1 0) interface is strongly polar
[Determination of intestinal secretory IgA in subjects with polyposis of the colon and rectum. Preliminary note].
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