Search results for "CURVE"

Valutazione del Deflusso superficiale con il Metodo CN-NRCS

2012

Sono descritti i lineamenti del metodo CN-NRCS introdotto negli anni 50. La diffusione del metodo soprattutto nel campo applicativo e professionale va attribuita alla semplicità della formulazione ed all’essenzialità del modello descritto dal solo parametro CN deducibile da tabelle estese e complete. Alla disamina della struttura del modello e dei suoi parametri segue una estesa descrizione dei metodi di taratura del parametro CN a scala di bacino. Sono quindi riportati i risultati della taratura di un campione di 61 bacini siciliani di cui si dispongono serie consistenti di piogge e contemporanee portate giornaliere. Infine sono proposte alcune applicazioni esemplificative del metodo e ven…

RUNOFF CURVE NUMBER METHOD IN SICILY: CN DETERMINATION AND ANALYSIS OF THE INITIAL ABSTRACTION RATIO

2010

The Curve Number method is widely used in hydrology because it’s simply based on a single parameter, CN, that represents the basin absorption. In this paper CN is evaluated at basin scale from rainfall-runoff multi-daily events (Mockus, 1964), in the observation period 1940-1997 (record length mean equal to 20 years), for 61 Sicilian basin with three different methods: NEH4 method, Asymptotic fitting method (Hawkins, 1990, Hawkins et al., 2002, Hawkins et al., 2009), Least squares method (Woodward et al., 2006, Hawkins et al., 2009). A first analysis of Sicilian watershed behavior indicates a major occurrence of standard CN response (42 basins), rather than complacent response (11 basins) a…

Ricostruzione delle curve di durata mediante un nuovo approccio ecoidrologico

2012

Le curve di durata delle portate forniscono un importante sintesi dei processi idrologici più rilevanti occorrenti a scala di bacino. Sebbene vengano tipicamente ottenute a partire dalle osservazioni idrometriche, uno dei temi più rilevanti in idrologia è proprio la loro ricostruzione anche in bacini non strumentati. A tal proposito sono stati sviluppati negli ultimi anni svariati approcci teorici, alcuni dei quali meritano particolare attenzione per la loro semplicità di applicazione e accuratezza dei risultati mostrati. La curva di durata viene spesso disaggregata in due componenti: una componente veloce di deflusso superficiale ed una componente lenta di deflusso subsuperficiale. Un rece…

Modelling and animation of theatrical Greek masks in an authoring system

2007

Analysis of curved incrementally launched box concrete bridges using the Transfer Matrix Method

2007

Incrementally launching technique is today very competitive for the construction of continuous concrete bridges. During construction the static scheme of these bridges varies continuously, with the advance of the deck above piers, producing temporary stresses rather different from those occurring in service. An approach to analyse construction phases of curved incrementally launched bridges is presented for concrete single box girder, using the Transfer Matrix Method. A procedure based on this method, already developed for straight launched bridges, has been extended to curved beams, allowing engineers to estimate the effects of horizontal curvature during the entire launching process. This…

Bifurcations of cuspidal loops

1997

A cuspidal loop for a planar vector field X consists of a homoclinic orbit through a singular point p, at which X has a nilpotent cusp. This is the simplest non-elementary singular cycle (or graphic) in the sense that its singularities are not elementary (i.e. hyperbolic or semihyperbolic). Cuspidal loops appear persistently in three-parameter families of planar vector fields. The bifurcation diagrams of unfoldings of cuspidal loops are studied here under mild genericity hypotheses: the singular point p is of Bogdanov - Takens type and the derivative of the first return map along the orbit is different from 1. An analytic and geometric method based on the blowing up for unfoldings is propos…

[Pharmacogenomics of antiretrovirals].

2008

HIV infection is a serious but treatable disease, yet current treatment is limited by development of resistance and high rates of adverse drug reactions. Antiretroviral therapy is especially suitable for pharmacogenomic investigation as both drug exposure and treatment response can be reliably measured. Increasing knowledge about genes implicated in pharmacokinetics, mode of action, efficacy, and toxicity of drugs has already provided relevant results for clinical practice, for example: The strong association of the abacavir hypersensitivity reaction with HLA-B*5701 permits testing patients for the allele, and if present avoiding the drug and therefore preventing the reaction. Persons with …

Photometric and Spectroscopic Properties of Type Ia Supernova 2018oh with Early Excess Emission from the $Kepler$ 2 Observations

2019

Supernova (SN) 2018oh (ASASSN-18bt) is the first spectroscopically-confirmed type Ia supernova (SN Ia) observed in the $Kepler$ field. The $Kepler$ data revealed an excess emission in its early light curve, allowing to place interesting constraints on its progenitor system (Dimitriadis et al. 2018, Shappee et al. 2018b). Here, we present extensive optical, ultraviolet, and near-infrared photometry, as well as dense sampling of optical spectra, for this object. SN 2018oh is relatively normal in its photometric evolution, with a rise time of 18.3$\pm$0.3 days and $\Delta$m$_{15}(B)=0.96\pm$0.03 mag, but it seems to have bluer $B - V$ colors. We construct the "uvoir" bolometric light curve hav…

Quantification of Listeria monocytogenes in salads by real time quantitative PCR

2005

Abstract A real time quantitative PCR (RTQ-PCR) was carried out purifying DNA extracts of Listeria monocytogenes using a High Pure Listeria Sample Preparation Kit and quantifying in a LightCycler system with hybridisation probes. A standard curve was constructed with serial dilutions. A range linear relationship, from 10 to 10 5 L. monocytogenes colony forming units (CFU), was observed between threshold cycle ( C t ) and logarithmic concentration of the serial dilutions. The assay was linear in a range from 10 to 10 5 L. monocytogenes CFU and the coefficient of determination ( r 2 ) was > 0.98. RTQ-PCR presented an efficiency of > 85%. The accuracy of the PCR-based assay, expressed as % bia…

Developmental control of the heat-shock stress regulon in Streptomyces coelicolor

1995

In the differentiating eubacterium Streptomyces coelicolor, nutritional imbalances activate a developmental programme which involves the heat-shock stress regulon. In liquid batch cultures, the growth curve could be separated into four components: rapid growth 1 (RG1), transition (T), rapid growth 2 (RG2) and stationary (S). Patterns of gene expression in cultures subjected to heat shock in various phases were recorded on two-dimensional gels and analysed using advanced statistical methods. The responses of all heat-shock proteins (HSPs) were highly dependent upon the growth phase, thus demonstrating that the four phases of growth were physiologically distinct. For many HSPs, the levels of …