1,721,045 research outputs found
Magnetic susceptibility measurements used for monitoring heavy metals in the industrial area of Tito scalo. Comparison with the results obtained in different industrial areas of Basilicata Region (southern Italy)
No full textBackground level characterization of heavy metals soil concentrations in an industrial area of Southern Italy
No full textSource origin and parameters influencing levels of heavy metals in TSP, in an industrial background area of Southern Italy
No full textIn this paper, we investigate the relationships among atmospheric concentration of trace elements and some meteorological parameters. In particular, the effects of different meteorological conditions on heavy metal levels are interpreted by means of a multivariate statistical approach. The analysed variables were measured during a monitoring survey that started in 1997, and this survey was carried out in order to evaluate the atmospheric concentrations of heavy metals in the industrial area of Tito Scalo (Basilicata Region, Southern Italy). Here we present and analyse the data set collected from 1997 to 1999. The data set includes daily concentrations of total suspended particulates (TSP), daily concentrations of eight metals (Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn) in TSP and daily meteoclimatic data (temperature, rainfall, speed and wind directions). Both the concentration level and the occurrence of peak concentration events are consistent with the characteristics of the study area: abundant small and medium industrial plants in a mountainous and unpolluted zone. Regarding the origin of sources of heavy metals in TSP, the statistical procedure allows us to identify three profiles: SP1 and SP2 related to industrial sources and SP3 related to other sources (natural and/or anthropogenic). In particular, taking into account the effect of different meteorological conditions, we are able to distinguish the contribution of different fractions of the same metal in the detected source profiles
Detrended fluctuation analysis of the spatial variability of the temporal distribution of Southern California seismicity
No full textUsing the seismic catalog, relocated by Richards-Dinger and Shearer [J. Geophys. Res. 105 (2000) 10939], the analysis of the spatial variation of the time-clustering properties of the seismicity of southern California has been performed. The time span of the analyzed catalog is from 1981 to 1998. The analysis is performed by using the detrended fluctuation analysis (DFA) of the interevent intervals, that permits the identification of correlated temporal structures in time series, even in presence of trends or nonstationarities. The significance of the estimates of the scaling exponents, performed by the DFA, is obtained by analyzing the time dynamics of surrogate versions of the data, generated by randomly shuffling the order of the interevent intervals. The analysis carried out in the present study could provide better understanding of the time-clustering properties of the area, characterized by the presence of three different depth ranges
Dynamical degrees of freeedom of DNA sequences by local and global short-range prediction
No full textThe dynamical properties of DNA sequence samples have been analyzed on the basis of a procedure able to distinguish chaos from randomness. The procedure relies on the concept of short-term (range) predictability of low-dimensional chaotic motions and can distinguish merely linear stochastic processes, e.g. fractional Brownian motion, from truly nonlinear deterministic systems. The method consists in obtaining forecasts on the basis of past events in the sequence. Two forecasting strategies are used. The local strategy views the sequence as the outcome of a nonlinear process, whereas the global approach considers the series as the outcome of a linear stochastic process. For both approaches, the predictive skill is computed and their inter-comparison allows us to get insight into and an understanding of the structure of DNA sequences. Nucleotidic sequences belonging to different taxonomic and functional groups have been analyzed. Different behaviors have been detected according to the existence of finite correlation dimension for specific groups of sequences
STIMA DELLA PROBABILITA' DI OCCORRENZA IN SERIE STORICHE DI POTENZIALE SPONTANEO IN UN'AREA SISMICA DELL'APPENNINO LUCANO.TERREMOTI IN ITALIA:PREVISIONE E PREVENZIONE DEI DANNI
No full textHeavy metals in rye grass species versus atmospheric concentrations of metals in TSP
No full textThe aim of this paper is to evaluate the reliability of ryegrass species as active biomonitors by assessing atmospheric metal concentrations. We show a procedure for measuring atmospheric concentrations of heavy metals by means of biomonitors and present the data collected between July 1997 and October 2000 in the industrial area of Tito Scalo (Basilicata region, Southern Italy). In particular, we discuss the reproducibility of the biomonitoring measures, the influence of plant age and the correlation between metal concentrations in plants and in atmospheric particulate. Statistical analysis of measured data suggests us that in the investigated site, Cd, Cr and Ni are suitable to be monitored by means of ryegrass species. For the other metals, their emission patterns in atmosphere make it difficult to identify the correlation structure between plants and particulate, and as a result the interpretation of the biomonitoring data is complex. On the basis of the results, we believe that for correct application of active biomonitoring procedure, a careful preliminary analysis of the monitoring site and integration of the biomonitoring and chemical-physical observation is necessary
Stochastic behaviour and scaling laws in geoelectrical signals measured in a seismic area of southern Italy
No full textMagnetic susceptibility measurements used for monitoring heavy metals in the industrial area of Tito scalo. Comparison with the results obtained in different industrial areas of Basilicata Region (southern Italy)
No full textExperimental and statistical investigation on atmospheric heavy metals concentrations in an industrial area of Southern Italy
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