1,360,017 research outputs found
Search for violation using triple product asymmetries in and decays
No full textWe present the measurement of CP -violating asymmetries in bottom baryon decays, using Λ0b → ph− h+ h− and Ξb0 → ph− h+ h− decays, where h = K,π. The analysis is based on a data sample collected by the LHCb experiment in proton-proton collisions at centre-of-mass energies of 7TeV and 8TeV in 2011 and 2012, corresponding to integrated luminosities of about 1.0 fb−1 and 2.0 fb−1 , respectively. The CP -violating asymmetries, based on triple products, are measured in different regions of phase space and also integrated over the phase space. We reach a sensitivity of 1% on CP-violating asymmetries, the most precise measurement in bottom baryon decays to date
Beyond the Vegard's law: solid mixing excess volume and thermodynamic potentials prediction, from end-members
No full textA method has been developed, herein presented, to model binary solid solutions' volume, enthalpy and Gibbs energy using the energy state functions, E(V,S), of the end-members only. The E(V,S)s are expanded around an unknown mixing volume, VMix, and the fundamental equilibrium equation −(∂E/∂V)S=P is used to determine VMix. VMix allows us to model enthalpy, straightforwardly. The same argument holds using Helmholtz energy, F(V,T), in place of E(V,S), and the equilibrium equation becomes −(∂F/∂V)T=P. One can readily determine the Gibbs free energy, too. The method presented remarkably simplifies computing of solid mixings' thermodynamic properties and makes it possible to preserve crystal structure symmetry that would undergo reduction because of the introduction of disordered super-cells
Fig. 1 in Salix ×marchettii (Salicaceae), a new nothospecies from the Apuan Alps (Northern Tuscany, Central Italy)
No full textFig. 1. – Salix ×marchettii M. Merli & F. Mart. A. Male specimen. B. Female specimen.Published as part of Merli, Marco & Martini, Fabrizio, 2017, Salix ×marchettii (Salicaceae), a new nothospecies from the Apuan Alps (Northern Tuscany, Central Italy), pp. 339-343 in Candollea 72 (2) on page 341, DOI: 10.15553/c2017v722a11, http://zenodo.org/record/568446
Environmental management tools and experiences in the agri-food sector: a framework of Product-Oriented Environmental Management System (POEMS)
No full textLa tomba etrusca ellenistica di Pian de' Campi a Poggibonsi un rinvenimento archeologico in Valdelsa ai tempi della reggenza lorenese
No full textAbout the reliability of the Maximum Entropy Method in reconstructing electron density: the case of MgO
No full textThe reliability of the Maximum Entropy Method (MEM) to reconstruct finite temperature electron
density (ED) is here discussed, investigating the
case of periclase (MgO). A theoretical electron
density has been generated by quantum mechanic calculations and folded with a function simulating
atomic thermal motion, in order to produce a eference errorless ED [q(r)REF]. The Fourier coefficients of q(r)REF have been calculated, and
used as “observed” diffraction intensities to
reconstruct via MEM the original ED. The electron density attained by MEM [q(r)MEM] and q(r)REF
have been compared with each other (pixel-by-pixel
nd critical points) to assess the ability of MEM to retrieve EDs, on the basis of a set of observed
tructure factors. We have carried out our study varying the number of observed structure factors
[i.e. sin (q)/l cut-off], the nature of he prior-ensity [uniform density and procrystal-like model]
and the way in which the prior-density is treated during MEM aximization [fixed or free to change]. We observe that (i) it is recommendable to use the
rior-density as a start point only, and allow it
to change during maximization; (ii) the closer
is the prior-density to q(r)REF, the easier one
attains by MEM a orrect ED; (iii) if the prior-density is varied and a sufficient large number
of observed structure factors used, then
MEM tends to yield converging EDs, regardless
of the prior-density chosen as a start point
Stability of wide-graded rubble mounds
No full textThe reshaping of temporary rubble mounds like the core of breakwaters or reclamation bunds is often a concern for contractorsi n the construction stages of marine structures. The formulas found in literature for the prediction of such behavior are few, and they do not provide clear insight on the influence of relevant parameters, in particular the small dimensions and wide stone-size gradation of the material involved, usually consisting of quarry run or resulting from dredging. The previous research in the field of dynamic stability focused on berm breakwaters and gravel beaches. These two typologies of structures define the range to which the rubble mounds considered in this study generally belong. An overview on the design tools provided by the technical literature shows that, whenever the grading was included as a governing parameter, some influence was recognized in the characteristics of the structure (e.g. the permeability) and in the dynamism of the different fractions of stone sizes. However, very wide ranges of the parameter grading were never investigated and a specific analysis in this direction constitutes the main significance of this study. The Delft University of Technology provided the laboratory facilities to carry out physical model tests on a wide graded rubble mound structure representative of the core of a breakwater. The parameter D85/D15, describing the stone-size gradation of the construction material, was varied between the values 2.71 and 17.7, and two different seaward slopes of the model structure were also tested. The reshaped cross-shore profiles measured during the tests showed how if the grading increases the stability of the structure is reduced. This is not always in accordance with the findings of previous researchers, showing how the extrapolation of existing empirical formulas to structures with high values of the ratio D85/D15 do not give reliable results. Instead, the formulas given by van de Meer (1992) to estimate the whole reshaped profile of a dynamic slope predict with good agreement the shape of the measured profiles, although the physical model shows a larger horizontal extension of the displacements. This difference is governed by the grading, being more noticeable as this parameter increases. This result leads to the definition of new formulas, some of them being modifications of the ones given by van der Meer, to describe the geometry of a reshaped profile. The formulas, all including the parameter grading, are derived through curve fitting of the measured data. Also a formula for the direct estimation of the crest recession is given. As a final step, a simple numerical model is proposed in which the new formulas are implemented, constituting a quick way to assess the shape of a slope after a wave attack. As a suggestion for further utilization of the results of physical modeling, a brief comparison is also carried out between the output of the tests and the prediction of the numerical model XBeach (developed mainly at UNESCO-IHE). In conclusion, this research points out how the formulas provided by the technical literature are not reliable in representing the effects of a very wide stone-size gradation in the stability of a rubble mound structure. Physical model tests proved to be a suited way to investigate these effects, as the nature of the phenomena who play a role in the stability does not allow a simple analytical representation. The tests carried out within the present study lead to the implementation of a numerical model of practical use for engineers and contractors: further investigations through laboratory tests are recommended to validate and extend the findings of this study. Another proposed direction for further research is the comparison between the results of physical model tests and the output of numerical models.Hydraulic EngineeringCivil Engineering and Geoscience
Trading activity and Overconfidence: First Evidence from a large European Database
No full textWe investigate the presence of overconfidence for 43 958 individual investors using a large brokerage account database between 1999 and 2006. We employ three methodologies to gauge overconfidence and our main results show that independently of the methodology considered, individual investors are subject to overconfidence and consequently trade too frequently. Securities investors are buying are systematically underperforming those they are selling on follow-up periods; investors are clearly not making profitable trades.
Un'idea di Marziale : a proposito di un recente commento al V libro degli epigrammi
No full textThe article discusses some aspects of the fifth book of Martial's epigrams, starting from the new commentary by A Canobbio (Naples 2011). The structure of the book's prefatory section (epigr. 1-20) is particularly interesting because it creates a complex strategy of communication to the audience princepy, patrons, anonymous lector) and of self-fashioning of the author. The intertextual relationship with poetic authorities of the Augustan age, especially Horace and Ovid, is strongly present here while in the corpus of the book the dialogue with Catullus and the theater of Plautus becomes more evident - As Canobbio shows in relation to the 'cycle' of the subsellia. The fifth book proves to be a complex poetic text which enacts a multi-level dialogue with the Roman public and with the Latin literary tradition
La lima e il testo da Ovidio a Marziale: poetica e comunicazione
No full textIn the poetic texts from the Imperial age (from exiled Ovid to Martial and Statius) the metaphor of poetic lima undergoes
a deep transformation: the lima is no longer in the hands of the poet, who polishes his verses for years and years, but
(often) in those of a cultivated patron, requested by the author to correct the book before publication.
In the Flavian age the lima is then placed within the complex communication system of literary patronage, where it
becomes an element of homage and compliment. However, the metaphor never loses its original poetological meaning:
both Martial and Statius use it differently, in relation to themselves and in relation to intellectual patrons, thus subtly
reaffirming their own different and higher commitment to literature
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