1,720,975 research outputs found
MAPPIX: A software package for off-line micro-pixe single particle aerosol analysis
No full textIn the framework of a multiannual experiment performed at Baia Terra Nova, Antarctica, size-segregated
aerosol samples were collected by using a 12-stage SDI impactor (Hillamo design). Approximately 2800
particles, belonging to the first four supermicrometric SDI stages – 8.39, 4.08, 2.68, 1.66 lm dynamic aerosol
diameter cuts – were analyzed at the INFN-LNL micro-PIXE facility, a three lens Oxford Microprobe
(OM) product, installed in the early nineties. Four regions on each of the 12 sub-samples were measured;
60 aerosol particles were detected on average in each of the analyzed regions.
The off-line single aerosol particle (SAP) analysis of such big amount of data required software that is
able to rapidly handle the acquired data, with a simple and fast area selection procedure; the subsequent
automated PIXE spectra analysis with a specialized code was also needed.
The MAPPIX 2.0 software was designed to make easier and faster the user jobs during the SAP analysis.
The package is composed of two separate routines: the first one is devoted to data format conversion
(OM-LMF file format to MAPPIX format), while the second one is devoted to micro-PIXE maps graphical
presentation and aerosol particle selection procedure.
The MAPPIX data format and software features will be discussed; a short report of the speed performances
will be presented
Atmospheric Aerosol at the Svalbard Islands in Year 2010. A Preliminary Analysis of Multielemental Data from Size-Segregated Samples: (III) Crustal Elements and Minor Elements
No full text10.1016/j.nimb.2017.02.019
No full textNew results regarding alloy composition and microstructure for a series of ancient bronze and silver items by X-ray Fluorescence and micro-Particle Induced X-ray Emission spectrometry were obtained in the framework of an extensive numismatic project (Scythian-type arrowheads, arrowhead-shaped mon-etary signs and wheel coins produced by Histria, 7th–4th century of BCE, and Dacian Radulesti-Hunedoara-type silver tetradrachms, 2nd–1st century of BCE). In Histria, warfare arrowheads were used for trade with Barbarian neighbors at first, then mechanically modified, next melted and cast as dedicated monetary signs, being, in the end, replaced by wheel coins. Three different types of alloys have been iden-tified, and Cu-Mn and Cu-Pb segregation shown. In a blank for Radulesti-Hunedoara-type coins, Ag-(Cu+Pb) segregation has been demonstrated, suggesting an imperfectly alloyed silver-leaded bronze
Determinazione degli elementi minerali in pesci marini allevati nel Nord Adriatico.
No full textThis study aimed at evaluating mineral elements content in two reared species of marine fish. Flesh samples of shi drum (Umbrina cirrosa) from ponds and off-shore European sea bass (Dicentrarchus labrax) were analysed by PIXE (Particle Induced X-Ray Emission) technique. Regarding both species, results showed a high nutritional value and a large variation intra-species probably due to genetic differences. theamount of heavy metals (Pb and Hg <0.1 ppm9 and metalloids (As <1 ppm) were lower than those detected in the same wild fish species. Thus, environmental and feeding condition did not affect food security
Valutazione della concentrazione sierica di selenio nella bovina da latte durante il periodo peripartale.
No full textAtmospheric Aerosol at the Svalbard Islands in Year 2010. A Preliminary Analysis of Multielemental Data from Size-Segregated Samples: (I) Sea-Salt Components
No full textAssessment of serum selenium levels in 2-month-old sucking calves using total reflection X-ray fluorescence technique
No full textThe assessment of selenium status of livestock plays an important role in the production of medicine since low serum Se levels influence disease resistance in ruminants. It has been proved that Se deficiency may cause muscular dystrophy, cardiomyopathy and even death. Serum level has been widely used to evaluate the Se short-term status in animals since there is a good association between serum Se level and the dietary intake of the element over a wide range. The purpose of this work was to determine the Se serum concentration in a population of 78 sucking 2-month-old calves, in order to corroborate a clinical diagnosis of severe deficiency status. The samples were analyzed by total reflection X-ray fluorescence (TXRF) at the ITAL STRUCTURES Research Laboratory. The results obtained from the serum samples presented Se concentrations varying from 10 to 66 ng/ml. The comparison between the obtained values and the expected serum selenium values (60-80 ng/ml), confirmed a mild to severe deficiency status in the investigated population
Characterisation of concrete, mortar and calcium silicate hydrated phases (CSH) and thorium retention analyses by ion beam techniques
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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