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Sökning: WFRF:(Mauri Francesco)

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  • Mauri, Giacomo, et al. (författare)
  • Fast neutron sensitivity of neutron detectors based on boron-10 converter layers
  • 2018
  • Ingår i: Journal of Instrumentation. - IOP Publishing. - 1748-0221. ; 13:3
  • Tidskriftsartikel (refereegranskat)abstract
    • In the last few years many detector technologies for thermal neutron detection have been developed in order to face the shortage of 3He, which is now much less available and more expensive. Moreover the 3He-based detectors can not fulfil the requirements in performance, e.g. the spatial resolution and the counting rate capability needed for the new instruments. The Boron-10-based gaseous detectors have been proposed as a suitable choice. This and other alternatives technologies are being developed at ESS. Higher intensities mean higher signals but higher background as well. The signal-to-background ratio is an important feature to study, in particular the gamma-ray and the fast neutron contributions. This paper investigates, for the first time, the fast neutrons sensitivity of 10B-based thermal neutron detector. It presents the study of the detector response as a function of energy threshold and the underlying physical mechanisms. The latter are explained with the help of theoretical considerations and simulations.
  • Furberg, Helena, et al. (författare)
  • Genome-wide meta-analyses identify multiple loci associated with smoking behavior
  • 2010
  • Ingår i: Nature Genetics. - Nature Publishing Group. - 1546-1718. ; 42:5, s. 134-441
  • Tidskriftsartikel (refereegranskat)abstract
    • Consistent but indirect evidence has implicated genetic factors in smoking behavior1,2. We report meta-analyses of several smoking phenotypes within cohorts of the Tobacco and Genetics Consortium (n = 74,053). We also partnered with the European Network of Genetic and Genomic Epidemiology (ENGAGE) and Oxford-GlaxoSmithKline (Ox-GSK) consortia to follow up the 15 most significant regions (n > 140,000). We identified three loci associated with number of cigarettes smoked per day. The strongest association was a synonymous 15q25 SNP in the nicotinic receptor gene CHRNA3 (rs1051730[A], b = 1.03, standard error (s.e.) = 0.053, beta = 2.8 x 10(-73)). Two 10q25 SNPs (rs1329650[G], b = 0.367, s. e. = 0.059, beta = 5.7 x 10(-10); and rs1028936[A], b = 0.446, s. e. = 0.074, beta = 1.3 x 10(-9)) and one 9q13 SNP in EGLN2 (rs3733829[G], b = 0.333, s. e. = 0.058, P = 1.0 x 10(-8)) also exceeded genome-wide significance for cigarettes per day. For smoking initiation, eight SNPs exceeded genome-wide significance, with the strongest association at a nonsynonymous SNP in BDNF on chromosome 11 (rs6265[C], odds ratio (OR) = 1.06, 95% confidence interval (Cl) 1.04-1.08, P = 1.8 x 10(-8)). One SNP located near DBH on chromosome 9 (rs3025343[G], OR = 1.12, 95% Cl 1.08-1.18, P = 3.6 x 10(-8)) was significantly associated with smoking cessation.
  • Morell, Nicolas, et al. (författare)
  • Optomechanical Measurement of Thermal Transport in Two-Dimensional MoSe2 Lattices
  • 2019
  • Ingår i: Nano Letters. - 1530-6984. ; 19:5, s. 3143-3150
  • Tidskriftsartikel (refereegranskat)abstract
    • Nanomechanical resonators have emerged as sensors with exceptional sensitivities. These sensing capabilities open new possibilities in the studies of the thermodynamic properties in condensed matter. Here, we use mechanical sensing as a novel approach to measure the thermal properties of low-dimensional materials. We measure the temperature dependence of both the thermal conductivity and the specific heat capacity of a transition metal dichalcogenide monolayer down to cryogenic temperature, something that has not been achieved thus far with a single nanoscale object. These measurements show how heat is transported by phonons in two-dimensional systems. Both the thermal conductivity and the specific heat capacity measurements are consistent with predictions based on first-principles.
  • Pasquale, Vincenzo, et al. (författare)
  • Isolation and characterization of Clostridium difficile from shellfish and marine environments
  • 2011
  • Ingår i: Folia Microbiologica. - 0015-5632 .- 1874-9356. ; 56:5, s. 431-437
  • Tidskriftsartikel (refereegranskat)abstract
    • This pilot study was carried out to evaluate the occurrence of Clostridium difficile in marine environments and in edible shellfish. Samples of seawater, sediment, and zooplankton were collected at five sampling stations in the Gulf of Naples. Six samples of edible shellfish, furthermore, were obtained: two from mussel farms and four from wholesalers. The isolation and the characterization of C. difficile strains were carried out using selective media and molecular techniques, respectively. C. difficile was isolated from nine of the 21 samples investigated. Shellfish and zooplankton showed the highest prevalence of positive samples. No C. difficile was detected in marine sediment. Majority of the C. difficile isolates were toxin A/B positive. Six known different PCR ribotypes (003, 005, 009, 010, 056, and 066) were identified, whereas one strain may represent a new PCR ribotype. C. difficile may be present in the marine environment in Southern Italy, including shellfish and zooplankton. This study is reporting the isolation of C. difficile from zooplankton, clams, and mussels and pointing out a new possible route to exposure to C. difficile of healthy individuals in the community.
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