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Ricostruzione paleoclimatica attraverso l'analisi di uno speleotema nella Sardegna centro-orientale: risultati preliminari
Get PDFThis paper, carried out in the framework of a local project 60% «Pleistocene-Holocene palaeoclimate and palaeogeography reconstructions based on marine and continental deposits of Sardinia» (Resp. Prof. Sandro De Muro) and within a series of researches involving several bodies (Archaeological Superintendence of NU/SS, Universities of Parma and Cagliari) and caving associations (Gruppo Speleo Ambientale
Sassari, Gruppo Speleo-Archeologico Giovanni Spano of Cagliari, Unione
Speleologica Cagliaritana and Gruppo Archeo Speleo Ambientale Urzulei), reports the
first results of a palaeo-climate study carried out on a stalagmite sampled in the Su Palu
cave, Codula Ilune, Urzulei (Central-East Sardinia). This stalagmite has been subjected
to radiometric U/Th dating and stable isotope δ180 and δ 13C analysis. These isotopic
data based on 139 samples showed a general increase in stable isotope ratios that would
indicate a growth of the concretion in a period of global warming (Upper Pleistocene-
Holocene?). The chronological setting by means of U/Th datings, unfortunately, did not
allow to define the exact timeframe because of the presence of detrital Thorium. C14
analysis are under way to try to obtain information on the time during which the
stalagmite growed
La Conservazione della biodiversità nell’ecoregione Mediterraneo Centrale: contributi al Piano Nazionale per la Biodiversità
Get PDFLa vita sulla Terra è il risultato di complessi equilibri dinamici che permettono i processi evolutivi e l’incredibile diversità biologica del pianeta. Le comunità biologiche sono oggi sottoposte a processi di erosione dovuti all’azione dell’uomo che appaiono fortemente accelerati, con effetti su scala globale e locale. Questi fattori oltre a determinare una perdita diretta di biodiversità innescano il deterioramento e l’impoverimento delle capacità di resistenza e resilienza degli ecosistemi, minacciando i processi ecologici ed evolutivi, soprattutto attraverso la frammentazione degli habitat e degli areali delle popolazioni animali e vegetali
Total factor productivity estimates: some evidence from european regions
Get PDFThis paper provides total factor productivity estimates for a sample of 115 European Regions over the period 1976-2000. In particular, a set of Cobb-Douglas production functions is estimated using panel techniques and allowing for heterogeneity across regions. Moreover, on the basis of specific panel tests, the paper shows that there is empirical evidence which suggests the presence of unit roots in the series and panel cointegration tests are applied to guard against spurious regression
Piante carnivore: un percorso didattico
Get PDFSince carnivorous plants always stir up interest and curiosity, we have
realized a didactic route describing their different evolutional strategies. The route
begins from observation of specimens present in the «Orto Botanico di Cagliari» to
arrive inside the «Museo Botanico» where, by means of ancient tridimensional models
and others of new constructions together with copious descriptive material, the visitor
is guided to discover these strange vegetables
Il mondo del lavoro a Taiwan. La nascita della classe operaia e la formazione del movimento dei lavoratori
Get PDFThe thesis has been an historical reading of Taiwan industralization and of the formation of its labour movement. The research question was based on the evidence that the labour movement has been weak. The intention of the research was to understand why, by focusing the attention on the fragmentation of labour produced by the Taiwanese export oriented mode of industrialization. Taiwan’s capitalist industrialization can be examined through an historical approach of state–society relations under the Gramsci model of historical analysis expressed on Notebook 25 “On the Margins of History, History of the Subaltern Groups”. Gramsci assumed that labour history is a disaggregated function of civil society’s history and of its relation with the state. To interpret the history of Taiwan labour through this kind of approach, it is necessary, according to the model, to understand the pre-capitalist mentality and social dynamics characterised by the so called guanxi (informal social networks), a typical aspects of Confucian societies. Industrialization installed on the top of this pre-existing social base that became the foundation of Taiwanese labour-state-capital relations. Guanxi in Taiwanese capitalist industrial society create such a strong hegemonic alliance between state and capital that constrained labour in a cage, preventing any autonomous initiative and reaction of workers. Thus, the movement was born as a tool of party politics and was directed by both the ruling party (KMT) and the opposition party (DPP). As a conclusion, labour movement in Taiwan rather than being a workers’ way of affirming their interests, it has been a strategy of capital to affirm its hegemony
Modulation of homogeneous space-time rainfall cascades to account for orographic influences
Get PDFThe development of efficient space-time rainfall downscaling procedures is highly important for the implementation of a meteo-hydrological forecasting chain operating over small watersheds. Multifractal models based on homogeneous cascade have been successfully applied in literature to reproduce space-time rainfall events retrieved over ocean, where the hypothesis of spatial homogeneity can be reasonably accepted. The feasibility to apply this kind of models to rainfall fields occurring over a mountainous region, where spatial homogeneity may not hold, is herein investigated. This issue is examined through the analysis of rainfall data retrieved by the high temporal resolution rain gage network of the Sardinian Hydrological Survey. The proposed procedure involves the introduction of a modulating function which is superimposed to homogeneous and isotropic synthetic fields to take into account the spatial heterogeneity detected in observed precipitation events. Specifically the modulating function, which reproduces the differences in local mean values of the precipitation intensity probability distribution, has been linearly related to the terrain elevation of the analysed spatial domain. Comparisons performed between observed and synthetic data show how the proposed procedure preserves the observed rainfall fields features and how the introduction of the modulating function improves the reproduction of spatial heterogeneity in rainfall probability distributions
Manuale per la raccolta, studio, conservazione e gestione ex situ del germoplasma
Get PDFL’oggetto del manuale è costituito dal germoplasma delle unità tassonomiche relative alla flora autoctona dei territori mediterranei e, più in generale, europei. Tale testo è stato predisposto per operare sul terreno e in laboratorio seguendo semplici e chiare indicazioni nell’ottica di una conservazione in situ ed ex situ rigorosa, rispettosa della biodiversità, del territorio e della cultura che ne deriva. Si ritiene che le metodologie di seguito espresse possano agevolare il lavoro dei raccoglitori e quello dei curatori delle banche, garantendo la raccolta, il trattamento e la migliore gestione possibile
del germoplasma, nel rispetto delle procedure e degli standard nazionali e internazionali. Questo lavoro è rivolto sia a quanti operano in settori specifici (tecnici delle banche del germoplasma, vivaisti, addetti ai lavori in ambito istituzionale, ricercatori e docenti universitari) sia a tutte le persone interessate alle tematiche della conservazione ex situ. Particolare attenzione è stata rivolta agli studenti, ai quali si è cercato di trasferire con linguaggio semplice le esperienze di ricerca e sperimentazione svolte dagli Autori e tutte le informazioni ricavate dalla letteratura scientifica disponibile, con l’obiettivo di fornire loro indispensabili elementi conoscitivi di base. E’ bene ricordare che la difesa della biodiversità attraverso la conservazione delle risorse genetiche non è sempre rivolta a endemismi o a specie d’interesse fitogeografico, ma contempla anche piante
di larga diffusione in Europa, talvolta potenzialmente minacciate dal progressivo restringersi del loro areale di distribuzione. Si pensi a quanto è successo alle formazioni boschive della Pianura Padana che oggi, fortemente frammentate dall’espansione agricola, occupano una superficie equivalente a meno dell’1% rispetto a quella originale (Gorian, in verbis).Il manuale è strutturato in 14 capitoli che descrivono le metodologie attualmente più utilizzate dal momento della raccolta in campo del germoplasma fino alla sua conservazione. Le azioni che riguardano il germoplasma da conservare sono spesso dimensionate a quantitativi modesti di materiale; ciò non esclude che in molti casi raccolta, lavorazione e conservazione siano rivolte a volumi consistenti ed operate meccanicamente
Geomorfositi nel salto di Quirra
Get PDFSardinia is probably one of the richest Italian regions for what concerns geology and geomorphology. Many researches on geological and geomorphological monuments have been carried out since the early 90's, emphasising this great geodiversity of the Island. This research is collected in the framework of the National Project COFIN 2001-2003 "Geomorphosites in the Italian Landscape", and analyses an area comprised between the provinces of Nuoro and Cagliari, in which many interesting sites are located
Gli scheletri del Castello di Acquafredda
Get PDFLast spring, three skeletons were found next to the Acquafredda Castle, located near the town of Siliqua-Cagliari and built in the 13th century by the Count Ugolino Della Gherardesca, quoted in the Divina Commedia. They were buried directly in soil, with the arms layed on breast. In the second tomb we found, there were only the legs of the skeleton. Individual 1 was a male 35-39 years old, tall about 162 cm with still open metopic suture. Individual 2 was tall 164-165 cm. Individual 3 was a male about 39-44 years old tall about 166-167 cm with stress signs in vertebral coloumn. In photoes 6-7-8-9 you can see the Individual 3 restoration of physiognomy I made