Influence of substrate depth and vegetation type on temperature and water runoff mitigation by extensive green roofs: shrubs versus herbaceous plants

The relative contribution of substrate depth and vegetation type on temperature mitigation and stormwater runoff reduction was studied in an experimental green roof in North eastern Italy. Two substrate depths (120 and 200?mm) and two vegetation types (herbaceous plants and shrubs, respectively) were used, and compared to control modules with similar substrate depths but left bare of vegetation. Experimental observations showed that: a) green roofs substantially reduce thermal load over the rooftop, with significant effects of substrate depth and no apparent impact of vegetation type; b) thermal effects are strongly influenced by substrate water content; c) green roofs strongly reduce water runoff with significant substrate x vegetation effects. Our data suggest that green roof design addressed to optimization of the thermal functions should take into account adequate planning of substrate depth. Moreover, our data show that vegetated modules out-competed medium-only ones in terms of runoff reduction capacity, in accordance with some previous studies. Both shrub-vegetated and herbaceous modules intercepted and stored more than 90% rainfall during intense precipitation events, with no significant difference between the two vegetation types despite different substrate depths.     

The Dark,and Independent,Side of the Italian Labour Market

Abstract. This paper presents an empirical investigation of the two faces of the Italian labour market, the dark and the regular. Results from ‘exhaustive’ VAR/VEC models suggest that there are no connections (causal relationships, feedback, contemporaneous correlation) between them. In this sense, we could correctly refer to undeclared work as an ‘independent’ side of the market. I interpret these results as providing empirical support for the ineffectiveness of labour policies in converting black economy employment into regular over the last two decades.     

Insulin-like growth factor 1 receptor polymorphism rs2229765 and circulating interleukin-6 level affect male longevity in a population-based prospective study (Treviso Longeva--TRELONG)

Insulin-like growth factor 1 (IGF-1) signaling modulation has been associated with increased lifespan in model organisms, while high levels of circulating interleukin-6 (IL-6) are a marker of disability and mortality. In the prospective, population-based "Treviso Longeva"--TRELONG Study from Italy (n = 668, age range 70-105.5 years at baseline, followed for seven years) we investigated the effects of survival on the IGF-1 receptor (IGF-1R) gene polymorphism rs2229765, the IL-6 gene promoter polymorphism rs1800795, and plasma concentrations of IGF-1 and IL-6, alone or in combination. We found a sex-dependent effect for the IGF-1R rs2229765 polymorphism, as male carriers of the homozygous A/A genotype survived longer, while the IL-6 rs1800795 genotype did not influence overall or sex-specific longevity. Higher IL-6 levels were more detrimental for survival among males than females, while IGF-1 had no dose-response effect. These findings sustain the hypothesis that sex-specific longevity relies on detectable differences in genetic and biochemical parameters between males and females.     

A Bayesian bivariate hierarchical model with correlated parameters for the analysis of road crashes in Italian tunnels

Statistical Methods & Applications - An analysis of crashes occurring in 252 unidirectional Italian motorway tunnels over a 4-year monitoring period is provided to identify the main causes of...     

Business Diversification in the Securities Industry: Implications for the Exchanges

The growth strategies of the listed exchanges affect the morphology of the securities industry as they are focused on the consolidation of trading infrastructures and, on the other hand, on the diversification of the business model. New “conglomeral exchanges” are characterized by a far-reaching production function. Since they integrate product-service lines which are complementary, they potentially herald competitive distorsions limiting the investor’s freedom of choice and prejudicing the interest for the best result from the investment.

Hierarchical disjoint principal component analysis

AStA Advances in Statistical Analysis - Dimension reduction, by means of Principal Component Analysis (PCA), is often employed to obtain a reduced set of components preserving the largest possible...