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[en] AQUAGRID is the subsurface hydrology service of the Sardinian regional Grid infrastructure, designed to deliver complex environmental applications via a user-friendly Web portal. The service is oriented towards the needs of water professionals providing them a flexible and powerful tool to solve water resources management problems and aid decision between different remediation options for contaminated soil and groundwater. In this paper, the AQUAGRID application concept and the enabling technologies are illustrated. The heart of the service is the CODESA-3D hydrogeological model to simulate complex and large groundwater flow and contaminant transport problems. The relevant experience gained from the porting of the CODESA-3D application on the EGEE infrastructure, via the GILDA test bed (https://gilda.ct.infn.it), has contributed to the service prototype. AQUAGRID is built on top of compute-Grid technologies by means of the EnginFrame Grid portal. The portal enables the interaction with the underlying Grid infrastructure and manages the computational requirements of the whole application system. Data management, distribution and visualization mechanisms are based on the tools provided by the DatacroSSing Decision Support System (http://datacrossing.crs4.it). The DSS, built on top of the SRB data-Grid middleware, is based on Web-GIS and relational database technologies. The resulting production environment allows the end-user to visualize and interact with the results of the performed analyses, using graphs, annotated maps and 3D objects. Such a set of graphical widgets increases enormously the number of AQUAGRID potential users because it does not require any specific expertise of the physical model and technological background to be understood. (Author)
[en] Due to the important economic impact of elver fishing in the Loire estuary, the authors report the study of the sensitivity of this animal to sharp and important increases of temperature. After a biological portrait of the elver (birth, migration, life), the authors describes when and how its fishing is practiced. They also indicate the levels of this fishing production in different French harbours of the Atlantic coast. Then, they present the implemented methodology to perform laboratory tests on elvers. Results are presented and discussed in terms of mortality. In conclusion, the authors suggest other studies to be undertaken on other species, on the quantity of animals trapped in equipment, and on the presence of dead elvers in fisher nets
[en] Mycobacterium xenopi is one of the most common agents responsible for nontubercolar mycobacterial pulmonary disease on AIDS patients. These lesions have been studied with conventional radiography while CT has been used in patients with a specific mycobacterioses or non-AIDS pulmonary conditions from Mycobacterium xenopi. 12 AIDS patients were examined. They had pulmonary lesions from Mycobacterium xenopi, patients age ranged 30 to 46 years. All patients had CD4 blood levels lower than 250 cells/mL and Mycobacterium xenopi in the sputum. All patients underwent a standard chest radiograph and a CT examination. CT images were evaluated by three radiologists independently and the definitive diagnosis was made in the presence of a fourth radiologist. Chest CT showed parenchymal consolidation in 66% of cases, associated with bilateral basal bands in 16% of cases. Consolidation was unilateral in 41% of cases and most frequently involved the right lower lobe. Bilateral reticular interstitial involvement was seen in the patients (41%). Micro nodules in 1 patient (8%) and mediastinal adenopathy in 33% of cases. Two patients had pre-existing emphysema and 1 had bronchiectasis. The frequency of lung disease from Mycobacterium xenopi has increased because of the spreading of the HIV infection. Such lung lesions in AIDS patients are a specific in appearance and localization, which the clinical radiologist needs to consider to address treatment planning. The frequent finding of parenchymal consolidation and the absence of cavitary lesions may be referred to the poor capability of AIDS to produce an adequate inflammatory response. The lung lesions tend to distribute in the lower lobes unilaterally. Adenopathy was also a frequent finding. CT plays a fundamental role in studying the chest of these patients because it permits to locate lung lesions with higher accuracy than conventional radiography and to detect adenopathies, micronodules, reticular interstitial involvement and bronchiectasis
[it]Scopo di questo lavoro e' valutare il ruolo della TC nello studio delle lesioni polmonari nei pazienti con Mycobacterium xenopi e AIDS. Sono stati esaminati 12 pazienti con eta' compresa tra 30 e 46 anni, con malattie polmonari da Mycobacterium xenopi e AIDS. In tutti i pazienti sono stati riscontrati un livello ematico di CD4+ inferiore a 250 cellule/μl e presenza del Mycobacterium xenopi nell'espettorato. I quadri TC sono stati valutati da tre radiologi in sessioni indipendenti e la diagnosi definitiva e' stata ottenuta in presenza del quarto radiologo. L'esame TC del torace ha evidenziato nel 66% dei pazienti la presenza di infiltrato parenchimale associato a strie basali bilaterali nel 16% dei casi. L'infiltrato parenchimale e' risultato monolaterale nel 41% dei casi e ha interessato piu' frequentemente il lobo inferiore di destra. In 5 pazienti (41%) e' stata descritta la presenza di interstiziopatia reticolare bilaterale e in uno (8%) di micronodulazione). Nel 33% dei pazienti e' stata riscontrata adenopatia mediastinica. In 2 pazienti e' stata segnalata la presenza di enfisema pre-esistente. In un paziente sono state osservate bronchiectasie. A seguito della diffusione dell'infezione da HIV la malattia polmonare da Mycobacterium xenopi e' sempre piu' frequentemente oggetto di osservazione clinico-radiologica. Le lesioni polmonari nei pazienti con malattia da Mycobacterium xenopi e AIDS assumono aspetti e localizzazioni sostanzialmente aspecifiche, che devono essere considerate dal radiologo clinico ai fini del corretto inquadramento terapeutico. Il riscontro frequente dell'infiltrato parenchimale e insieme l'assenza di lesioni di tipo cavitario possono essere attribuiti alla scarsa capacita' dei pazienti con AIDS di sostenere una risposta floristica adeguata. La distribuzione delle lesioni polmonari ha mostrato predilezione per i lobi inferiori con teressamento monolaterale. E' stata evidenziata inoltre significativa presenza di adenopatie. La TC svolge un ruolo importante nello studio del torace di questi pazienti in quanto consente di localizzare con migliore definizione rispetto alla radiografia del torace le lesioni polmonari e di identificare la presenza di adenopatie, micronodulazioni, interstiziopatia reticolare e bronchiectasie
[en] We present a detailed study of new Australia Telescope Compact Array and XMM-Newton observations of LHA 120-N 70 (hereafter N 70), a spherically shaped object in the Large Magellanic Cloud, classified as a superbubble. Both archival and new observations were used to produce high quality radio continuum, X-ray, and optical images. The radio spectral index of N 70 is estimated to be α = –0.12 ± 0.06, indicating that while a supernova (SN) or supernovae have occurred in the region at some time in the distant past, N 70 is not the remnant of a single specific SN. N 70 exhibits limited polarization with a maximum fractional polarization of 9% in a small area of the northwest limb. We estimate the size of N 70 to have a diameter of 104 pc (±1 pc). The morphology of N 70 in X-rays closely follows that in radio and optical, with most X-ray emission confined within the bright shell seen at longer wavelengths. Purely thermal models adequately fit the soft X-ray spectrum which lacks harder emission (above 1 keV). We also examine the pressure output of N 70 where the values for the hot (P X) and warm (PH II) phases are consistent with other studied H II regions. However, the dust-processed radiation pressure (P IR) is significantly smaller than in any other object studied in Lopez et al. N 70 is a very complex region that is likely to have had multiple factors contributing to both the origin and evolution of the entire region.
[en] We investigate young type Ia supernova remnants (SNRs) in our Galaxy and neighbouring galaxies in order to understand their properties and early stage of their evolution. Here we present a radio continuum study based on new and archival data from the Australia Telescope Compact Array (ATCA) towards N 103B, a young (≤1000 yrs) spectroscopically confirmed type Ia SNR in the Large Magellanic Cloud (LMC) and proposed to have originated from a single degenerate (SD) progenitor. The radio morphology of this SNR is asymmetrical with two bright regions towards the north-west and south-west of the central location as defined by radio emission.N 103B identified features include: a radio spectral index of (consistent with other young type Ia SNRs in the Galaxy); a bulk SNR expansion rate as in X-rays; morphology and polarised electrical field vector measurements where we note radial polarisation peak towards the north-west of the remnant at both 5500 and 9000 MHz. The spectrum is concave-up and the most likely reason is the non-linear diffusive shock acceleration (NLDSA) effects or presence of two different populations of ultra-relativistic electrons.We also note unpolarised clumps near the south-west region which is in agreement with this above scenario. We derive a typical magnetic field strength for N 103B of 16.4 μG for an average rotation measurement of . However, we estimate the equipartition field to be of the order of ∼235 μG with an estimated minimum energy of . The close () proximity of N 103B to the LMC mid-plane indicates that an early encounter with dense interstellar medium may have set an important constrain on SNR evolution.Finally, we compare features of N 103B to six other young type Ia SNRs in the LMC and Galaxy, with a range of proposed degeneracy scenarios to highlight potential differences due to a different models. We suggest that the single degenerate scenario might point to morphologically asymmetric type Ia supernova explosions.