1,322 research outputs found

    Decision Analysis with Value Focused Thinking as a Methodology to Select Building for Deconstruction

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    The purpose of this research was to examine the reuse and recycling of building materials on Wright-Patterson Air Force Base. There are a variety of conflicting factors concerning the removal of a building and the model quantitatively evaluates alternatives with respect to the decision maker’s values. The research questions were addressed with both a comprehensive literature review as well as the implementation of the value focused thinking methodology. The model found that the temporary living facilities are the alternatives that achieve the highest value. The result of this research effort was a value model that aids decision makers in identifying buildings for deconstruction

    A numerical study of planar arrays of correlated spin islands

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    We present our analysis of a system of interacting islands of XY spins on a triangular lattice that has been introduced a few years ago by Eley et al. to account for the phenomenology in experiments on tunable arrays of proximity coupled long superconductor-normal metal-superconductor junctions. The main features of the model are the separation of a local and a global interaction energy scale and the mesoscopic character of the spin islands. Upon lowering the temperature the model undergoes two crossovers corresponding to an increasing phase coherence on a single island and to the onset of global coherence across the array; the latter is a thermodynamical phase transition in the Ising universality class. The dependence of the second transition on the island edge-to-edge spacing is related to the proximity-effect of the coupling constant.Comment: 6 pages, 5 figures, accepted for publication in EPJ

    The cumulative overlap distribution function in realistic spin glasses

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    We use a sample-dependent analysis, based on medians and quantiles, to analyze the behavior of the overlap probability distribution of the Sherrington-Kirkpatrick and 3D Edwards-Anderson models of Ising spin glasses. We find that this approach is an effective tool to distinguish between RSB-like and droplet-like behavior of the spin-glass phase. Our results are in agreement with a RSB-like behavior for the 3D Edwards-Anderson model.Comment: Version accepted in PRB. 12 pages, 10 figure

    Unveiling GRB hard X-ray afterglow emission with Simbol-X

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    Despite the enormous progress occurred in the last 10 years, the Gamma-Ray Bursts (GRB) phenomenon is still far to be fully understood. One of the most important open issues that have still to be settled is the afterglow emission above 10 keV, which is almost completely unexplored. This is due to the lack of sensitive enough detectors operating in this energy band. The only detection, by the BeppoSAX/PDS instrument (15-200 keV), of hard X-ray emission from a GRB (the very bright GRB 990123), combined with optical and radio observations, seriously challenged the standard scenario in which the dominant mechanism is synchrotron radiation produced in the shock of a ultra-relativistic fireball with the ISM, showing the need of a substantial revision of present models. In this respect, thanks to its unprecedented sensitivity in the 10-80 keV energy band, Simbol-X, through follow-up observations of bright GRBs detected and localized by GRB dedicated experiments that will fly in the >2010 time frame, will provide an important breakthrough in the GRB field.Comment: 4 pages, 2 figures. Paper presented at "Simbol-X: the hard X-ray universe in focus", held in Bologna, Italy, on 14-16 May 2007. To be published in Memorie della Societa' Astronomica Italian

    A bizarre complication of shoulder arthroscopy

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    A case is presented of an unusual complication of shoulder arthroscopy, which was caused by incorrect location of the posterior portal, inducing neurapraxia of both the axillary and radial nerves, with significant clinical and functional sequelae. A subsequent open surgical neurolysis was required to restore normal nerve function. This type of lesion has not been reported previously

    Morphological traits, reproductive and productive performances of Casertana pigs reared outdoors

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    Casertana is an Italian autochthonous pig breed. In the past, the breed was common in Campania and the surrounding area in South Italy because it was valued for its productive performance, particularly regarding the fattening tendency, but in recent decades, autochthonous swine have been replaced by cosmopolitan lean-type pigs and the Casertana breed also experienced a dramatic reduction in numbers. Concern over the preservation of genetic resources and the increased demand for regional food suggest a new way of maintaining the breed. Unfortunately, few recent data on the morpho- logical as well as on the productive traits are available. To ascertain the characteristics of the Casertana breed a pro- ductive trial was performed by comparing Casertana and Large White pure breed and their cross. Sixteen females and 6 males of pure breed Casertana and 18 females and 2 males of pure breed Italian Large White were mated twice to pro- duce Casertana, Large White and Casertana x Large White piglets. The average number of piglets born was significant- ly lower in Casertana gilts, but no difference in the number of weaned piglets among genetic types was observed. Sixty- eight animals of the three genetic types were reared outdoors and received two distinct diets differing in energy content. Pigs were weighted individually every month to calculate average daily gain. Morphological traits of Casertana pigs were also recorded. A total of 54 animals (21 Casertana at 151 kg live weight, 15 crossbreed at 157 kg live weight and 18 Large White at 179 kg live weight) were slaughtered and data on carcasses were collected. Average daily weight gain differed markedly (P< 0.05) among genetic types (450; 552; 695 g/d, respectively for Casertana; Casertana x Large White; Large White) and consequently the slaughter weight also differed. Casertana showed higher dressing percentages that the Italian Large White (P< 0.05). Backfat thickness was also clearly affected by genetic type (P< 0.05): Casertana pigs had the highest value (44.91 mm). The diet had no influence on the average daily weight gain and backfat thick- ness. However, pigs fed with higher energy component had higher (P< 0.05) dressing percentage
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