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41.
Relative motion of the Adriatic with respect to the confining plates: seismological and geodetic constraints 总被引:3,自引:0,他引:3
42.
Sara Picone Francesca Alvisi Enrico Dinelli Caterina Morigi Alessandra Negri Mariangela Ravaioli Carmela Vaccaro 《第四纪科学杂志》2008,23(5):489-501
Sedimentological, geochemical and micropalaeontological data from sediment cores in the northwestern Adriatic Sea were obtained to reconstruct the stratigraphic framework and palaeogeographic setting during the last post‐glacial sea‐level rise (14000–6000 yr BP). Four lithostratigraphic units were identified: (a) distal plain deposits (>14000 yr BP), submerged during the first phases of marine ingression; (b) coastal lagoon system; (c) barrier‐lagoon system, which is dated back to between 10019 ± 61 and 10228 ± 174 cal. yr BP from 14C dating on peat and shell remains; (d) marine prodelta deposits (<5500 yr BP). Geochemical data allow the identification of three distinct sediment sources: River Po, River Adige and Eastern Alpine rivers characterised by decreasing Ni/Mg ratios (50–70, 8–15 and 5–10, respectively) and Ba/Al ratios of 45–55, 55–65 and 35–45, respectively. The three sources display different relative abundances in time. During the Lateglacial, the Po is the main sediment source for the southern cores, whereas the Eastern Alps and the River Adige are the main sediment sources for the northern cores. This suggests a northern position of the Po River bed compared to previous studies. Coastal drowning led to a homogenization of the provenance signal within the sediments. Only after the marine transgression does a River Po signal appear in the northern cores. At the same time, in the southern cores the signal of Eastern Alpine rivers becomes stronger. Transgressive barrier‐lagoon and recent sediments do not display a predominant signal for provenance indicators. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
43.
Fossi MC Marsili L Lauriano G Fortuna C Canese S Ancora S Leonzio C Romeo T Merino R Abad E Jiménez B 《Marine environmental research》2004,58(2-5):269-274
Various studies have revealed high concentrations of contaminants such as organochlorines (OCs) and heavy metals in Mediterranean cetaceans. A geographical trend of contamination (PCBs and DDTs) has been found for striped dolphin (Stenella coeruleoalba). In this study we used a non-lethal approach (skin biopsy) to investigate bioaccumulation of OCs, including polychlorobiphenyls (PCBs), DDTs, polychlorodibenzo-p-dioxins (PCDDs), polychlorodibenzofurans (PCDFs), trace elements (Hg, Cd, Pb) and CYP1A activity (BPMO) in nine striped dolphins sampled in the Aeolian area (Sicily - Italy) in summer 2002. The arithmetic mean value of BPMO activity in this group was 43.46 AUF/g tissue/h. This value is approximately 3 times and 5 times lower, respectively, than the value found in the Ionian and in the Ligurian groups. Skin biopsies of striped dolphins emerged as a suitable material for assessing the toxicological status of the various Mediterranean groups. 相似文献
44.
Renzo Richiardone Massimiliano Manfrin Silvia Ferrarese Caterina Francone Vito Fernicola Roberto Maria Gavioso Luca Mortarini 《Boundary-Layer Meteorology》2012,142(3):425-442
The speed of sound in moist air is discussed and a more accurate value for the coefficient of the linear dependence of sonic
temperature on specific humidity is proposed. An analysis of speed-of-sound data measured by three sonic anemometers in a
climate chamber and in the field shows that the temperature response of each instrument significantly influences not only
the determination of sonic temperature, but also its fluctuations. The corresponding relative contribution to the error in
the evaluation of the temperature fluctuations and the turbulent heat fluxes can be as high as 40%. The calibration procedure
is discussed and a method of correction is proposed. 相似文献
45.
F. S. Delli Santi F. Delpino P. Inzani G. Sironi N. Mandolesi G. Morigi 《Astrophysics and Space Science》1981,76(2):385-389
An experiment has been performed at 325 MHz, with a 10 m tracking dish, for the search of pulsed radio emission associated with X-ray pulsars. No evidence of radio pulses has been found in the four sources investigated, although the radio pulsar PSR 0329+54, used as a testing object, has been detected successfully. 相似文献
46.
Stefano Calcaterra Claudio Cesi Caterina Di Maio Piera Gambino Katia Merli Margherita Vallario Roberto Vassallo 《Natural Hazards》2012,61(1):257-266
This paper reports experimental data on surface and deep displacements evaluated by means of GPS stations and inclinometers
in two rototranslational deep landslides in a clayey slope of the Italian Southern Apennines. The displacements of the landslides
cause continuous damage to buildings and infrastructures. To study these phenomena and control their effects, the local public
administration provided financial support for a geotechnical investigation that started in 2004. Laboratory tests, in situ
pore pressure and inclinometer measurements were carried out. In July 2006, systems of fixed-in-place inclinometer probes
with continuous data acquisition were installed in two of the eleven guide casings, in correspondence to the slip surfaces
detected by previous periodical measurements. In the meanwhile, a GPS network was installed, consisting in six permanent stations
and ten non-permanent ones. Among the latter, five were installed on the top of five inclinometer casings. The experimental
results show that, in the case under study, the surface displacements evaluated by means of the GPS stations are consistent
with the surface displacements evaluated by means of the inclinometer measurements. This implies mutual data validation, availability
of considerable amount of continuous data, as well as monitoring continuity when, for some reason, one of the instruments
goes out of use. 相似文献
47.
Asbestos and other fibrous minerals contained in the serpentinites of the Gimigliano-Mount Reventino Unit (Calabria,S-Italy) 总被引:1,自引:1,他引:0
Andrea Bloise Teresa Critelli Manuela Catalano Carmine Apollaro Domenico Miriello Alessandro Croce Eugenio Barrese Francesca Liberi Eugenio Piluso Caterina Rinaudo Elena Belluso 《Environmental Earth Sciences》2014,71(8):3773-3786
Serpentinites are metamorphic rocks with good technological properties and valuable ornamental characteristics, which have been exploited since ancient times. Actually, their use is limited and monitored in several countries worldwide because they can contain fibrous asbestos minerals that may be carcinogenic. Furthermore, certain types of fibrous minerals can be confused with asbestos, and must therefore be carefully investigated. We have investigated the possible presence of the asbestos and non-asbestos fibrous phases contained in serpentinitic rocks in a meta-ophiolitic sequence from the Gimigliano-Mount Reventino Unit (Southern Italy), which had not been previously assessed. The detection and quantification of asbestos and the correct distinction of the fibrous non-asbestos minerals are very important not only from a scientific point of view, but also from a legislative one. This is especially the case for the administrative agencies that have to take decisions with regards to the implementation of public and occupational health protection measures (e.g., in road yards and quarry excavations). As a consequence of this, serpentinitic rock samples have been characterized in detail through X-ray powder diffraction, scanning and transmission electron microscopy combined with energy-dispersive spectrometry, analytical electron microscopy (SEM–EDS and TEM–AEM), differential scanning calorimetry, thermogravimetry and micro-Raman spectroscopy. Two kinds of asbestos and four kinds of non-asbestos fibrous silicates have been detected in the examined samples. In order of decreasing abundance these are polygonal serpentine, chrysotile, fibrous antigorite, tremolite, gedrite and magnesiohornblende. The size, morphology, crystallinity and chemical composition of the fibres were also discussed, in the light of the possible role these properties could play in the carcinogenic effect on human health. 相似文献
48.
Salvatore Manfreda Leonardo Mita Silvano Fortunato Dal Sasso Caterina Samela Leonardo Mancusi 《水文研究》2018,32(10):1420-1433
In hydrological modelling, the challenge is to identify an optimal strategy to exploit tools and available observations in order to enhance model reliability. The increasing availability of data promotes the use of new calibration techniques able to make use of additional information on river basins. In the present study, a lumped hydrological model—designed with the aim of utilizing remotely sensed data—is introduced and calibrated, adopting four different schemes that adopt, to varying extents, available physical information. The physically consistent conceptualization of the hydrological model used allowed development of a step by step calibration based on a combination of information, such as remotely sensed data describing snow cover, recession curves obtained from streamflow measurements, and time series of surface run‐off obtained with a baseflow mathematical filter applied to the streamflow time‐series. Results suggest that the use of physical information in the calibration procedure tends to increase model reliability with respect to approaches where the parameters are calibrated using an overall statistic based, considerably or exclusively, on streamflow data. 相似文献