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Search Results: 1 - 10 of 1886 matches for " Riccardo Giannitrapani "
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Positive-Operator-Valued Time Observable in Quantum Mechanics
Riccardo Giannitrapani
Physics , 1996, DOI: 10.1007/BF02435757
Abstract: We examine the longstanding problem of introducing a time observable in Quantum Mechanics; using the formalism of positive-operator-valued measures we show how to define such an observable in a natural way and we discuss some consequences.
Quantum Coordinates of an Event in Local Quantum Physics
Riccardo Giannitrapani
Mathematics , 1998, DOI: 10.1063/1.532564
Abstract: Recently it has been proposed, using the formalism of positive-operator-valued measures, a possible definition of quantum coordinates for events in the context of quantum mechanics. In this short note we analyze this definition from the point of view of local algebras in the framework of local quantum theories.
The FRED Event Display: an Extensible HepRep Client for GLAST
Marco Frailis,Riccardo Giannitrapani
Computer Science , 2003,
Abstract: A new graphics client prototype for the HepRep protocol is presented. Based on modern toolkits and high level languages (C++ and Ruby), Fred is an experiment to test applicability of scripting facilities to the high energy physics event display domain. Its flexible structure, extensibility and the use of the HepRep protocol are key features for its use in the astroparticle experiment GLAST.
Some comments on "Underground Religion. Cult and Culture in Prehistoric Italy" by Ruth Whitehouse
E. Giannitrapani
Papers from the Institute of Archaeology , 1993, DOI: 10.5334/pia.39
An interview with Dr. Ian Hodder, University of Cambridge
James Conolly,Enrico Giannitrapani
Papers from the Institute of Archaeology , 1995, DOI: 10.5334/pia.81
Combinatorial Tools for Regge Calculus
E. Fabri,R. Giannitrapani
Physics , 1997,
Abstract: In this short note we briefly review some recent mathematical results relevant to the classical Regge Calculus evolution problem.
Business Cycles and Recessions in the OECD Area  [PDF]
Riccardo Fiorito
Modern Economy (ME) , 2013, DOI: 10.4236/me.2013.43A022

Recessions are less frequent (10%), more volatile and less persistent than negative business cycles are (50%). In this article, OECD annual data are used to provide a taxonomy of postwar recessions, showing in particular the frequency, the features and the number of countries involved in major episodes. We shall also implement a simple way for inserting positive (or negative) growth cases into standard business cycle analysis, stressing in particular the importance of recessions for stabilization policies. This applies mostly to fiscal policies that risk otherwise to be more pro-cyclical than normally required.

Researches on Methodologies to Verify Reduced Sensitivities of Venturia inaequalis in Field to Difenoconazole and First Indications of a Survey in Italy  [PDF]
Riccardo Fiaccadori
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.89138
Abstract: Resistance of Venturia inaequalis to the first IBS triazoles occurred in the 80’s in Italy and other countries. Successively number of applications sensibly decreased and problems of resistance to IBS generally disappeared. In 2010 suspects of resistance to the newer IBS difenoconazole, the actually most used IBS, appeared in several countries. In vitro tests the results confirmed the previous researches: the monoconidia from populations which were poorly controlled showed moderate reduced sensitivity respect to well controlled and wild-types. New in vivo tests were realized with preventive and curative applications on seedlings. No different activity among the three types of populations (poorly, well-controlled and wild-types) was found in preventive applications. On the contrary, in curative applications, wild-types and well controlled populations showed a visible and statistically significant activity respect to the poorly controlled. A survey of sensitivity to difenoconazole was carried out in two Italian apple areas in 2013-2015 and showed the presence of populations resistant to difenoconazole. Probably the cause of the resistance spread was the increase of the number of applications of this IBS in the last years. However the problem appears more complex because nowadays resistance regards about all fungicides and with a higher severity respect previous decades. An increase of virulence of V. inaequalis strains appears to be the cause of this situation also for the high presence of cultivars with high or moderate susceptibility to scab. Foreseeable remedies consist in
Persistence of Venturia inaequalis Populations Resistant to Strobilurins in the Field and in the Glasshouse  [PDF]
Riccardo Fiaccadori
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.94042
Abstract: The research was focused on the persistence of resistance of V. inaequalis to strobilurins from resistant populations occurring in the field. It was studied with two types of experiments: the first in apple orchards where resistance occurred in 2005 and employ of these fungicides was suspended from 2006 to 2011, realizing every year sensitivity/resistance assays on strobilurins. In the second was verified the sensitivity/resistance of the same 2015 populations, repeatedly multiplied (ten inoculations) in glasshouse on apple seedlings. Results showed that the resistance survived in orchards all the years of tests (six years), despite sensitivity fluctuations occurred on infected leaves due to sexual crosses, competition with sensible strains and soil management. In glasshouse, the level of resistance of all populations increased quickly in first inoculations and values remained high (EC50 > 10 mg·L-1) in all the following inoculations, until the last, the 10th. V. inaequalis resistant strains seemed to show high fitness: relevant persistence in the field, and a capacity of prevail on sensible ones in absence of factors of field variability.
Labor Market Policies in Matching Models: Do Externalities Matter?  [PDF]
Riccardo Tilli
Theoretical Economics Letters (TEL) , 2019, DOI: 10.4236/tel.2019.94054
This paper analyzes the role played by five labor policy instruments (firing tax, hiring subsidies, taxation, unemployment benefits and tax structure) in a matching model with endogenous job destruction, when search externalities are not internalized and the market solution is inefficient. Since the theoretical model does not show univocal effects on equilibrium unemployment of some policy tools (such as hiring subsidies and firing tax), we propose a calibration and a numerical simulation of the model, in order to verify their real impact on unemployment and labor market structure. Results show that if, as is reasonable to assume, there are frictions on the labor market that generate search externalities, a labor market regulation becomes desirable and can be aimed at the internalization of externalities through an appropriate combination of labor policy instruments. In particular, our results have highlighted the crucial role of hiring subsidies and progressive taxation, not only for the achievement of the optimal solution, but also for supporting some forms of passive labor policies, mainly unemployment benefits and employment protection.
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