Search results for " time"

The overland flow equation for constant rainfall excess: an evaluation of runoff volume and time to equilibrium

2011

In this paper we study the runoff volume V(t) per unit area generated by the overland flow in the time interval [0,t], under a stationary rainfall r and initially dry conditions. For all positive values of the rating exponent m we express V(t) in closed form in terms of the solution q(t) of the overland flow equation. We define a simpler, approximated value of V(t) and show that, for m≥1, the error is smaller than a quantity of the form c e^{-pt}. Finally, for 1≤m≤3, we find an explicit upper bound for the time to equilibrium t_e, by showing that q(t) differs from the equilibrium outflow r by a quantity of the form c e^{-pt}.

Single tube real time PCR for detection of Streptococcus pneumoniae, Mycoplasma pneumoniae, Chlamydophila pneumoniae and Legionella pneumophila from …

2012

We designed a multiplex real time PCR for rapid, sensitive and specific detection of Streptococcus pneumoniae, Legionella pneumophila, Chlamydophila pneumoniae and Mycoplasma pneumoniae. The study cases consisted of 129 patients with community acquired pneumonia (CAP). Bacteriological techniques were implemented for detection of the cultivable organisms. DNA were extracted from sputa, throat swabs, bronchoalveolar lavages and tracheal aspirates and used as templates in real time PCR. The primers and probes were designed for cbpA (S. pneumoniae), p1adhesin (M. pneumoniae), mip (L. pneumophila) and ompA (C. pneumoniae). After optimization of real time PCR for every organism, the experiments w…

Coxiella burnetii spread in Sicily

2015

Q fever is a zoonotic disease caused by C. burnetii. Common reservoirs of this worldwide disease are wild and domestic animals, especially sheep, goats, cattle. Q fever has been considered also an occupational disease for abattoir workers, sheep shearers, livestock farmers, and veterinarians due to their direct contact with potentially infected animals. The aims of this study were to estimate C. burnetii spread in Sicilian livestock and among rangers that live and work in Western Sicily. ELISA test on animal serum and IFI test on seasonal rangers sera were carried out. Real Time PCR was performed on milk and vaginal swab samples collected from animals to search for the C. burnetii DNA. The …

Modello di regressione esteso per l'analisi semiparametrica dei dati di sopravvivenza

Design and analysis of discrete choice experiments for models with response time

2013

Traps and Surprises in Long Time Series. Considerations on Italian Living Standards after Unification

2011

Using Italian time series since 1861, we explore the evolution of living standards of Italian population after the Unification. Furthermore, we investigate the informative capacity of the aforementioned series to discover suitable long-run relationships among the variables to be used for a further modelling. Notwithstanding, the dynamics and the statistical characteristics of series have dramatically changed – both within each time series and among all ones – some interesting results have been drawn on the evolution of Italian living standards.

Cruise passengers' trajectories at destination. A Dynamic Time Warping approach.

2015

The present work aims at proposing an analysis of cruise passengers trajectories at the destination through Dynamic Time Warping algorithm. Data collected through GPS devices on cruise passengers’ behavior in the port of Palermo are analyzed in order to show similarities and differences among their spatial trajectories at the destination. A cluster analysis is performed in order to identify cruise passengers’ segments based on trajectories’ similarity. Results are of interest from both a methodological perspective related with the analysis of GPS data, and for the management and planning of cruise tourism destinations.

Discrete Time Portfolio Selection with Lévy Processes

2007

This paper analyzes discrete time portfolio selection models with Lévy processes. We first implement portfolio models under the hypotheses the vector of log-returns follow or a multivariate Variance Gamma model or a Multivariate Normal Inverse Gaussian model or a Brownian Motion. In particular, we propose an ex-ante and an ex-post empirical comparisons by the point of view of different investors. Thus, we compare portfolio strategies considering different term structure scenarios and different distributional assumptions when unlimited short sales are allowed.

Abnormal, deviant, illegal leisure. Pratiche del tempo libero fra trasgressione e illegalità

2011

Mcdonaldizzazione, ikeaizzazione, appleizzazione del leisure time: è abbastanza cool il nostro leisure time?

2011

Come altre modalità in cui si declina il tempo sociale, il tempo libero costituisce un oggetto di studiomolto importante per le scienze sociali. E d’altra parte, come ho avuto di evidenziare altrove (Lo Verde, 2009), è stato spesso da queste trascurato, almeno in Italia. Eppure ci sono ottime ragioni per studiare il tempo libero e lemodalità in cui si è declinato storicamente e geograficamente. Per quanto di natura sfuggente, esso costituisce una provincia finita di significato altrettanto importante – quanto le più definite province quali il lavoro, la famiglia, la partecipazione associativa e politica, la produzione e riproduzione culturale ecc., e che dovrebbe essere di nostro interesse …