324,199 research outputs found
Geologia, geomorfologia e stratigrafia
No full textThe Ca’ Nova site is part of the upper Parma Apennines and is located in the basin of the Gotra stream, a few hundred metres SE of Monte Chiaro (724 m above sea level), at an average altitude of 675-680 m above sea level.
The landscape displays a wide variety of morphological features resulting from the action of morphogenetic processes on a lithologically heterogeneous substrate. The site
falls within the geological unit known as the Casanova Complex (Cretaceous) of the
Ottone Tectonic Unit, consisting of coarse clastic deposits with turbiditic intercalations and heterometric strips of oceanic and continental lithosphere; a total of four lithozones can be distinguished without a precise stratigraphic order. Towards the south, there are tectonically extensive patches referable to serpentinites. The slopes of Mount Chiaro, often disrupted by landslides and glides and cut by small watersheds, delimit the site to the west.
In the immediate vicinity of the site, forms and deposits related to runoff and channelled water flow are identified. The mechanical action of direct rainfall and the runoff of surface water generate erosion phenomena on the slopes, favouring the formation of thick colluvial deposits at the foot of the slopes. It is probable that at the time of the settlement a minor hydrographic network was present, which ensured the outflow of surface waterand allowed the formation of small lake basins or ponds, then progressively filled by debris-colluvial deposits from the surrounding slopes.
The stratigraphic sequence uncovered in the trench of the methane pipeline, which
crossed the northern sector of the excavation area, is located within a large natural depression. This has been the subject of stratigraphic characterization (facies analysis) and micromorphological analysis.
The stratigraphy lies on a powerful debris-colluvial deposit (SU 15), which was covered
by partially laminated fine sediments of a ‘lacustrine’ nature (SU 14 and 13), as indicated by the presence of peat and diatoms, and then by additional colluvial sediments with characteristics indicating the establishment of transient hydromorphic conditions (SU 12). Chiefly, SU 13 appears to be rich in carbon fragments pertaining to silver fir, which due to their characteristics, including size, appear to be connected with repeated and
extensive forest fires. Finally, the sequence is covered by colluvial deposits (SU 11) from the surrounding areas, in which the Bronze Age artefacts are concentrated, accompanied by angiosperm charcoals, possibly from combustion structures.
In the southern sector of the excavation area, descriptive data and micromorphological
analysis made it possible to reconstruct the geological-stratigraphic model of the
area, highlighting five main types of debris-colluvial deposit that characterize the natural depositional succession. Particular attention was paid to the analysis of the filling facies of two artificial structures (Structure 1 and Structure 2), probably constructed for the drainage or collection of surface water. They were later filled in by natural colluvium, but also by anthropic activities. The analytical description of the charcoal remains at the top of one of the fills of Structure 2 leads to the identification of a burnt stump, which immediately preceded the preparation of an artificial surface, where valuable finds were unearthed
Associazioni ceramiche dai contesti tardoantichi della Piana di S. Martino, Pianello Val Tidone (PC): risultati preliminari
No full textLe indagini archeologiche nel sito della Piana di S. Martino, dirette dalla Soprintendenza per i Beni Archeologici dell‘Emilia Romagna, attualmente nelle persone delle dott.sse Daniela Locatelli e Roberta Conversi, e svolte sul campo dai volontari della locale Associazione Archeologica Pandora a partire dagli anni ‘90, hanno consentito di individuare due fasi di vita dell’insediamento: una è collocabile in età pre e protostorica, la seconda ebbe inizio in età tardoantica e si articolò lungo l‘arco di tutto il Medioevo. Davvero interessanti si sono rivelati i materiali relativi alle fasi tardoantiche dell’area abitativa, rinvenuti in particolare nelle trincee di fondazione o in strati riconducibili alle fasi d’impianto dell’insediamento tardoantico. Nonostante le attestazioni non siano molto consistenti dal punto di vista quantitativo, sono però estremamente importanti dal punto di vista documentario. Si tratta infatti di alcuni contesti nei quali, in associazione a manufatti ceramici in impasto grezzo, in maggior parte forme chiuse, che ben si inseriscono nella cultura materiale documentata nei contesti coevi della valle e risultano pienamente confrontabili con reperti di analoga cronologia provenienti da altri siti dell’Italia Settentrionale, troviamo buona testimonianza sia della presenza di manufatti in ceramica invetriata in monocottura analogamente diffusi sia dell’arrivo di esemplari di terra sigillata di provenienza africana, a tutt’oggi non altrimenti attestati nel territorio piacentino. L’analisi dei reperti, conservati presso il Museo Archeologico della Val Tidone, dovrà essere ulteriormente precisata con l’avanzare delle indagini nel sito e con il proseguire degli studi sui materiali rinvenuti. Tuttavia, alla luce di questi dati preliminari, si propongono alcune prime considerazioni sull’articolazione delle produzioni ceramiche a diffusione locale e sul loro rapporto con i manufatti d’importazione
Extracting cosmological signals from foregrounds in deep mm maps of the sky
No full textContext. The high Galactic latitude sky at millimeter and submm wavelengths contains significant cosmological information about the early Universe (in terms of the cosmic microwave background) but also the process of structure formation in the Universe from the far infrared background produced by early galaxies and the Sunyaev-Zeldovich effect in clusters of galaxies. Aims. As the Planck mission will produce full sky maps in this frequency range, deeper maps of selected low-foregrounds patches of the sky can produce complementary and important information. Here we analyze the performance of a balloon-borne survey covering a 10 degrees x 10 degrees patch of the sky with a few arcminute resolution and very high pixel sensitivity. Methods. We simulate the different components of the mm/submm sky (i. e., CMB anisotropies, SZ effect, radio and infrared sources, far infrared background, and interstellar dust) using current knowledge about each of them. We then combine them, adding detector noise, to produce detailed simulated observations in four observational bands ranging from 130 to 500 GHz. Finally, we analyze the simulated maps and estimate the performance of the instrument in extracting the relevant information about each of the components. Results. We find that the CMB angular power spectrum is accurately recovered up to l similar to 3000. Using the Sunyaev-Zel'dovich effect, most of the galaxy clusters present in our input map are detected (60% efficiency overall). Our results also show that much stronger constrains can be placed on far infrared background models
Synthesis and conclusions
No full textFrom a cultural perspective, the Ca’ Nova site
is a significant landmark in the Ligurian-Emilian
Apennines for the definition of the BINO
culture, which appears here (as in the sites of
Drusco in the Ceno Valley and Travo in the
Trebbia Valley), to be devoid of Terramare influences.
It should be remembered that the Parma
Apennines is a culturally nonhomogeneous territory,
being divided between the Terramare and
the BINO Cultures. As is well known, the former
occupies the central part of the Po Valley and the
Apennines of Reggio Emilia and Modena, the
latter the vast territories from western Lombardy
to Provence. A sort of border strip between
these two cultural aspects seems to run from the
upper valley of the Enza stream in the east to the
first hills between the river Taro and the Stirone
stream in the west. Ca’ Nova falls entirely within
the Western Culture territory, although it was
active as early as the middle phase of the Middle
Bronze Age, a period in which the Terramare
area of influence appears particularly extensive,
as indicated by the spread of Terramare-style
pottery finds in the Parma Apennines, much
wider in this phase than later
INTEGRATING OPTICAL AND RADAR IMAGERY TO ENHANCE RIVER DROUGHT MONITORING
No full textDrought events are growingly affecting European and Italian territories, hampering local environments and biodiversity, such as the ones relying on rivers for their subsistence. Monitoring of rivers is becoming an important issue to face drought crisis and may be exploited with different tools. Among the most commons, satellite imagery is exploited to map water coverage, basing on optical or radar sources. This work proposes a combination of the two sensors to overcome possible limitations of the single dataset exploitation, reaching a reliable result. The methodology is applied to a stretch of Po River in Lombardy region (Italy). Through Google Earth Engine platform, optical satellite Sentinel-2 and radar satellite Sentinel-1 data are processed. The combination of the radar data and of the optical spectral indices is carried out through a pixel-based supervised classification, with a Random Forest classifier. Maps of water coverage are obtained, numerical outcomes of water surface evaluation are recorded and validated by the mean of reference hydrometric data. A multitemporal analysis is then reported, aiming to prove the efficiency of the procedure. All iterations show reliable accuracies and correlation among water surface estimation and water table measurements in two sections of interest. In perspective, the proposed methodology will be implemented in tools for supporting drought monitoring to be integrated in environmental public administration policies
Access to consciousness of briefly presented visual events is modulated by transcranial direct current stimulation of left dorsolateral prefrontal cortex
No full textAdaptive behaviour requires the ability to process goal-relevant events at the expense of irrelevant ones. However, perception of a relevant visual event can transiently preclude access to consciousness of subsequent events — a phenomenon called attentional blink (AB). Here we investigated involvement of the left dorsolateral prefrontal cortex (DLPFC) in conscious access, by using transcranial direct current stimulation (tDCS) to potentiate or reduce neural excitability in the context of an AB task. In a sham-controlled experimental design, we applied between groups anodal or cathodal tDCS over the left DLPFC, and examined whether this stimulation modulated the proportion of stimuli that were consciously reported during the AB period. We found that tDCS over the left DLPFC affected the proportion of consciously perceived target stimuli. Moreover, anodal and cathodal tDCS had opposing effects, and exhibited different temporal patterns. Anodal stimulation attenuated the AB, enhancing conscious report earlier in the AB period. Cathodal stimulation accentuated the AB, reducing conscious report later in the AB period. These findings support the notion that the DLPFC plays a role in facilitating information transition from the unconscious to the conscious stage of processing
Dopamine in the medial prefrontal cortex controls genotype-dependent effects of amphetamine on mesoaccumbens dopamine release and locomotion
No full textCorrection to “Evidence for quasi‐biennial oscillations in zooplankton biomass in the subarctic Pacific” by A. Conversi and S. Hameed
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