1,129 research outputs found
Flexible query processing for SPARQL
Flexible querying techniques can enhance users' access to complex, heterogeneous datasets in settings such as Linked Data, where the user may not always know how a query should be formulated in order to retrieve the desired answers. This paper presents query processing algorithms for a fragment of SPARQL 1.1 incorporating regular path queries (property path queries), extended with query approximation and relaxation operators. Our flexible query processing approach is based on query rewriting and returns answers incrementally according to their ``distance'' from the exact form of the query. We formally show the soundness, completeness and termination properties of our query rewriting algorithm. We also present empirical results that show promising query processing performance for the extended language
Rooting the EDF method into the ab initio framework. PGCM-PT formalism based on MR-IMSRG pre-processed Hamiltonians
Recently, ab initio techniques have been successfully connected to the
traditional valence-space shell model. In doing so, they can either explicitly
provide ab initio shell-model effective Hamiltonians or constrain the
construction of empirical ones. In the present work, the possibility to follow
a similar path for the nuclear energy density functional (EDF) method is
analyzed. For this connection to be actualized, two theoretical techniques are
instrumental: the recently proposed ab initio PGCM-PT many-body formalism and
the MR-IMSRG pre-processing of the nuclear Hamiltonian. Based on both formal
arguments and numerical results, possible new lines of research are briefly
discussed, namely to compute ab initio EDF effective Hamiltonians at low
computational cost, to constrain empirical ones or to produce them directly via
an effective field theory that remains to be invented.Comment: 20 pages, 7 figure
PIXE characterization of CsI(Tl) scintillators used for particle detection in nuclear reactions
Particle-Induced X-ray Emission has been used to measure Thallium concentration in several CsI(Tl) scintillators from different manufacturers, in order to check their nominal declared values and correlate their behaviour with actual Tl concentration. Indeed, both Tl doping level and its uniformity affect light emission of these detectors, which are largely employed in nuclear physics experiments. In some of the examined crystals Tl concentration values from PIXE measurements came out to be quite different from those declared. This allowed us to explain apparent anomalies in the trend of their a/c-induced light yield ratio versus Tl content. In some cases, the presence of unexpected contaminants was also pointed out. 2008 Elsevier B.V. All rights reserved
Just Because
Woman with hand below chinhttps://scholarsjunction.msstate.edu/cht-sheet-music/7787/thumbnail.jp
Italy-Japan agreement and discrepancies in diagnosis of superficial gastric lesions.
The agreement between Italian and Japanese endoscopists and pathologists on endoscopic and histopathological diagnoses of superficial gastric lesions is verified with the use of Paris and Vienna classifications. The correlations between Paris endoscopic types and Vienna histopathological categories is high in both the independent Italian and Japanese evaluations. However, the agreement between Italian and Japanese endoscopists is moderate due to the difficult evaluation of the height of the lesions, in particular when they are mixed. The agreement on the size of the lesions is fairly good. The probability of the same allocation to the Vienna categories of a single case is 87 per cent, disagreements remaining in dysplasia grading, between dysplasia, not only high-grade but also low-grade, and in situ carcinoma, and on cancer invasion of the lamina propria. The results indicate that use of the Paris and Vienna classifications has reduced the discrepancies between Western and Japanese endoscopists and pathologists in the diagnosis of these lesions
AMBIENTE, ENERGIA, ALIMENTAZIONE. MODELLI GIURIDICI COMPARATI PER LO SVILUPPO SOSTENIBILE. ENVIRONMENT, ENERGY, FOOD. COMPARATIVE LEGAL MODELS FOR SUSTAINABLE DEVELOPMENT. Vol. I, Tomo II
AMBIENTE, ENERGIA,ALIMENTAZIONE. MODELLI GIURIDICI COMPARATI PER LO SVILUPPO SOSTENIBILE.. ENVIRONMENT, ENERGY, FOOD. COMPARATIVE LEGAL MODELS FOR SUSTAINABLE DEVELOPMENT . Volume I, Tomo I
Genetic resistance determinants to fusidic acid and chlorhexidine in variably susceptible staphylococci from dogs
Abstract
Background
Concern exists that frequent use of topically-applied fusidic acid (FA) and chlorhexidine (CHX) for canine pyoderma is driving clinically relevant resistance, despite rare description of FA and CHX genetic resistance determinants in canine-derived staphylococci. This study aimed to determine minimum inhibitory concentrations (MICs) and investigate presence of putative resistance determinants for FA and CHX in canine-derived methicillin-resistant (MR) and -susceptible (MS) staphylococci. Plasmid-mediated resistance genes (fusB, fusC, fusD, qacA/B, smr; PCR) and MICs (agar dilution) of FA and CHX were investigated in 578 staphylococci (50 MR S. aureus [SA], 50 MSSA, 259 MR S. pseudintermedius [SP], 219 MSSP) from Finland, U.S.A., North (NUK) and South-East U.K. (SEUK) and Germany. In all isolates with FA MIC ≥64 mg/L (n = 27) fusA and fusE were amplified and sequenced.
Results
FA resistance determinants (fusA mutations n = 24, fusB n = 2, fusC n = 36) were found in isolates from all countries bar U.S.A. and correlated with higher MICs (≥1 mg/L), although 4 SP isolates had MICs of 0.06 mg/L despite carrying fusC. CHX MICs did not correlate with qacA/B (n = 2) and smr (n = 5), which were found in SEUK SA, and SP from NUK and U.S.A.
Conclusions
Increased FA MICs were frequently associated with fusA mutations and fusC, and this is the first account of fusB in SP. Despite novel description of qacA/B in SP, gene presence did not correlate with CHX MIC. Selection pressure from clinical use might increase prevalence of these genetic determinants, but clinical significance remains uncertain in relation to high skin concentrations achieved by topical therapy
Relationships between methansulfononic acid in PM10 sampled at two Arctic sites (Ny Ålesund, Thule) and primary production and marginal ice zone in the surrounding seas.
Performance of the LHCb muon system with cosmic rays
The LHCb Muon system performance is presented using cosmic ray events
collected in 2009. These events allowed to test and optimize the detector
configuration before the LHC start. The space and time alignment and the
measurement of chamber efficiency, time resolution and cluster size are
described in detail. The results are in agreement with the expected detector
performance.Comment: Submitted to JINST and accepte
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