1,721,012 research outputs found
Accumulazione e crescita in Sardegna: la posizione dell'Isola nell'ambito delle regioni del Mezzogiorno ed il ruolo degli interventi diretti a ridurre le diseconomie esterne reali
No full textDivergent Sectorial Paths in Productivity and Long-term Inflation
No full textThe relationship between inflation and relative price variability (RPV) has been observed since the last century; recently, the subject has inspired much theoretical and empirical work. It has been claimed that relative price variability plays an autonomous role not only with respect to the aggregate inflation rate, but also with respect to the GDP growth rate, the interest rate and the monetary growth rate. We have developed an input-output (IO) model integrating real and cost-prices, which can accommodate different values of input substitution elasticities according to changes in relative prices, to explore the nature of this relationship in the Italian case. Our IO approach and the results show first, that the relationship also occurs at the structural level, and second, that the causal mechanism of the relationship involves divergent trends in sectorial productivity, with the following crucial factors: the adjustment of the compensation to productivity due to the primary factors, the substitution of factors by sector in response to the relative price, and the effect on final demand of the prices of goods and services. Moreover, our findings seem to suggest a potential risk of counter-intuitive effects of supply-side economic policies, since as well as enhancing sectorial productivity they also hinder potential system flexibility at the national and international levels
VIRTUAL ELEMENT METHOD FOR COMPUTATIONAL HOMOGENIZATIONS OF UNIDIRECTIONAL FIBER-REINFORCED COMPOSITE MATERIALS
No full textThe Virtual Element Method (VEM) is a generalization of the Finite Element Method (FEM) for the treatment of general polygonal/polyhedral mesh elements. Despite its recent introduction, VEM has been applied to several problems in structural mechanics. Due to such capability of dealing with mesh elements of general shape and of naturally addressing the presence of hanging nodes, the VEM ensures a noticeable simplification in the data preparation stage of the analysis, allowing implementing a mesh generation process over complex multi-domain geometries in a fully automated way. Moreover, for the lowest order VEM used in this contribution,no numerical integration is required to compute the system stiffness matrix, thus considerably reducing the computational cost of the analysis with respect to standard FEM. In this contribution, we present an application of the lowest order VEM to the material homogenisation of unidirectional (UD) fibre-reinforced materials. The representation of a material microstructure generally constitutes a remarkable effort in terms of input preparation, especially when there is not evident microstructural symmetry. For such a reason, computational icromechanics may represent a challenging benchmark for showing the potential of VEM, which forms the aim of the present work
Formazione ed impiego del risparmio nell'economia meridionale: ruolo dei trasferimenti e del progresso tecnico in un modello econometrico
No full textOptical switching spectroscopy of PbS quantum dots with dual-wavelength pump-probe
No full textOptical transmission modulation in PbS quantum dots is investigated using a dual-wavelength pump–probe technique.
High-energy excitation at 800 nm e2ciently alters the transmission of a probe beam 1100–1600 nm spectral range, with a
clear enhancement observed at longer wavelengths towards the exciton peak (2100 nm). A decay time of less than 2:5 ps is
measured for pump intensities of up to 3:8 GW=cm2. The maximum modulation is delayed by approximately 1 ps relative to
the perfect overlap of the pump and probe pulses, the time required for the electrons to reach lower energy states. Long-term
exposure shows photodegradation but the process is reversible and recovers on its own after several hours
THE ROLE OF SURGERY IN THE TREATMENT OF GERM CELL TUMORS IN CHILDHOOD. A REPORT FROM AN ITALIAN MULTIINSTITUTIONAL STUDY
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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