63,136 research outputs found
Cross-gradient joint inversion and clustering of ERT and SRT data on structured meshes incorporating topography
No full textThe combination of electrical resistivity and seismic refraction tomography is a common practice for the characterization of subsurface features. Presently, the cross-gradient inversion scheme stands out as one of the most robust joint approaches, and some authors modified it to manage complex topographies on unstructured meshes even if at the expense of introducing additional parameters in the inversion process. We propose in this work a cross-gradient algorithm for jointly inverting electrical and seismic tomographic data on structured meshes in cases with non-flat topography. The proposed approach preserves the benefit of the classical cross-gradient approach without the need to impose physical length scales, as for irregular meshes. The quality of the results is evaluated in comparison with independent inversion through a new standardized cross-gradient index and a fuzzy c-means analysis that provides an assessment of the reconstruction accuracy through the membership function. The proposed method was applied to both synthetic models and field-scale examples located in Central Italy, where an accurate geophysical reconstruction is needed for the rehabilitation of existing dams. For all cases, joint inversion yielded superior results compared to independent inversion, demonstrating better agreement with available borehole data. The effectiveness of the joint approach was also demonstrated by the post-inversion tools, where the new cross-gradient index highlighted changes in structural similarity whilst fuzzy c-means clustering allowed for a quantitative reconstruction (position and shape) of the main units at the sites, facilitating the detection of site layering modifications
Coupling ERT and SRT data through cross-gradient joint inversion and clustering on structured meshes incorporating topography
No full textThe joint inversion of electrical resistivity tomography (ERT) and seismic refraction tomography (SRT) is a common practice to achieve a more accurate characterization of subsurface features, since these methods are sensitive to different properties of the subsurface. We propose an approach for integrating ERT and SRT, which involves a cross-gradient joint inversion on structured meshes even in cases with complex topography and a post-inversion procedure where a new cross-gradient index and fuzzy c-means analysis are used to assess the reliability of the joint procedure and facilitate the interpretation of the results. Our strategy does not introduce non-strictly necessary elements within the joint inversion procedure for dealing with a non-flat tomography, which can accentuate the illposedness of the inverse problem. The proposed method was applied to both synthetic and a field cases located in Central Italy, where an accurate geophysical reconstruction is needed for rehabilitation of an existing dam and boreholes are available to validate the geophysical survey. For all cases, joint inversion consistently yielded superior results compared to individual inversion, and the post-inversion tools facilitated the assessment of the impact of the joint scheme and allowed for a quantitative reconstruction (position and shape) of the main units at the site
Numerical modelling of local seismic response in alluvial valleys filled by heterogeneous deposits for seismic microzonation studies in Northern Latium (Italy)
No full textAfter the 2016–2017 seismic sequence in Central Apennines, seismic microzonation studies were planned in the framework of the Ordinance 24 of the 12 th of May 2017 (OPCM 24/2017) issued by the Italian Presidency of the Council of Ministers. Numerical simulations aiming at estimating seismic amplification factors of uniform microzones located in several municipalities of the Latium Region were carried out in order to provide quantitative elements for reconstruction. The investigated areas include alluvial valleys of variable
shapes filled by heterogeneous deposits. The obtained results demonstrate that the heterogeneities of the alluvial deposits are responsible for variations in the seismic response; therefore, they cannot be neglected in estimating the local seismic response of the sites. The two case studies of Fonte del Campo and Posta were selected among the studied municipalities for illustrating the main findings
Aspetti critici e relazioni tra parametri geofisico-geotecnici dei terreni negli studi di microzonazione sismica in provincia di Campobasso
No full textNickel dermatitis from earrings 15 years after EU directive implementation: a clinical-epidemiological study and a market survey in Rome, Italy
No full textBackground: Nickel (Ni) dermatitis remains a highly prevalent allergic condition in Italy. There is a continuous need for clinical and epidemiological surveillance to evaluate whether or not European Ni Directive has been effective in contact allergy prevention. Objectives: To assess the prevalence of Ni dermatitis among patch-tested patients and self-interviewed school students and to analyse Ni release from earlobe jewellery. Methods: Results of patch tests performed in 2006–2007, 2015–2016 and 2017–2018 were retrieved. A questionnaire was compiled by 315 secondary school students. Ni release from earring parts was analysed with the EN1811:2015 method. Results: A significant time trend of decreasing Ni positivity from 2006–2007 to 2017–2018 was observed both in the overall population (44.1% in 2006–2007, 33.0% in 2015–2016, 31.6% in 2017–2018, P < 0.0001) and in female patients (P < 0.0001). Conversely, change was not significant in males (P = 0.16). Decrease was significant for all age groups, except for those aged >60 years (P = 0.51). Among 242 students who reported earring use, 130 (54%) reported symptoms at earlobes, mostly associated with jewellery of materials other than gold and silver (59% of those with earlobe symptoms). Ni release exceeded the migration limit in 4/21 (20%) earring parts. Conclusions: A high prevalence of Ni dermatitis and earlobe symptoms were found in Rome. A decreasing time trend was noted, with a significant decline in Ni sensitivity compared to the situation observed right after Ni Directive implementation. This most likely represents the consequence of reduced Ni content in earring parts, although a major care in the use of Ni-containing objects could contribute to explain these findings
High risk human papillomavirus genotyping in clinical samples: evaluation of different commercial tests
No full textThe aim of the present study is to compare the performance of several commercial human papillomavirus (HPV) tests in a cohort of 281 women. The hybrid capture II, the PreTect-HPV-Proofer, the linear array, and DR.(HPVIVD)-I-TM were utilized to detect and type HPV in parallel with in-house PCR tests followed by direct automated sequencing or by sub-cloning and sequencing. The concordance levels along with other tests were evaluated with a Cohen's K value varying between 0.60 to 0.88, indicating good correlation with nearly perfect agreement between hybrid capture II, (HCII) and the linear array test. High sensitivity was recorded by the linear array and HCII with 100% (95% CI, 0.8021 to 1.0000) detection of cervical intraepithelial neoplasia (CIN) III by both methods. Conversely, the PreTect-HPV-Proofer showed high specificity with 12% (95% CI, 0.7966 to 0.9163) positivity on normal samples. The genotyping analysis showed that agreement among tests was only low to moderate with great differences between different HPV types. Multiple infections were detected with poor concordance and sub-cloning assays revealed the presence of a lower number of HPV in comparison to the other methods. In summary, the use of different HPV tests applied to the same group of cervical smears may possibly lead to incongruent results, suggesting the need to standardize type-specific sensitivity of genotyping methods and the need to evaluate their accuracy in detecting multiple HPV infections. This would be a prerequisite for the use of genotyping assays in cervical cancer screening programs
Erratum to: Effect of moderate red wine intake on cardiac prognosis after recent acute myocardial infarction of subjects with Type 2 diabetes mellitus (Diabetic Medicine, (2006), 23, 9, (974-981), 10.1111/j.1464-5491.2006.01886.x)
No full textIn an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola.In an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola
Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at √s = 7 TeV
No full textThe prompt production of charmonium χ c and J / ψ states is studied in proton-proton collisions at a centre-of-mass energy of √s = 7 TeV at the Large Hadron Collider. The χ c and J / ψ mesons are identified through their decays χ c → J / ψ γ and J / ψ → μ + μ - using 36 pb - 1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for χ c and J / ψ, σ (χ c → J / ψ γ) / σ (J / ψ), is determined as a function of the J / ψ transverse momentum in the range 2 < p T J / ψ < 15 GeV / c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low p T J / ψ region
Faust : Romance Of The Secret Tribunals / By George W. M. Reynolds, Author Of "The Mysteries Of London", "Pickwick Abroad", &c. Illustrated In The First Style Of The Art
No full textFAUST : ROMANCE OF THE SECRET TRIBUNALS / BY GEORGE W. M. REYNOLDS, AUTHOR OF "THE MYSTERIES OF LONDON", "PICKWICK ABROAD", &C. ILLUSTRATED IN THE FIRST STYLE OF THE ART
Faust : Romance Of The Secret Tribunals / By George W. M. Reynolds, Author Of "The Mysteries Of London", "Pickwick Abroad", &c. Illustrated In The First Style Of The Art (1)
Cover (1)
Umschlagtitel (8)
Titelseite (9)
Contents (10)
Illustrations / Prologue (11)
Prologue (12)
Chapter I.-XCV. (14)
Epilogue (119
Fuzzy Mapping of Integrated Multiparameter Tomographic Data to Detect and Localize Geophysical Targets
No full textIn this work, we present an integrated and quantitative approach to detect and localize geophysical targets associated with both geological and anthropogenic complex scenarios. We complement electrical and seismic tomographic techniques and a machine-learning (ML) unsupervised algorithm [fuzzy C-means (FCM)] to get a final clustered section validated by borehole and well data, where the reliability is evaluated by the membership function. This is a good estimator of the reliability of the proposed procedure, as it ranges from 0 to 1, with one reflecting a high reliability of the clustering analysis. This method is applied to two case studies, related to the detection of leachate in a municipal solid waste landfill and the detection of the bedrock surface in a site prone to instability. For both cases, we also set up synthetic simulations by reproducing realistic models with similar layering and ranges of geophysical parameters as per the field cases. The results show the effectiveness of the method in providing a unique detection of the cluster associated with the desired targets, as highlighted by the matching with direct information. However, the accuracy of the reconstruction is reduced in areas where the resolution of geophysical methods is lower. We demonstrate that the proposed method can achieve a reliable reconstruction if it focuses on searching for one desired target only, rather than a comprehensive reconstruction of the whole layering at the site. This approach can be a valuable automatic tool for improving the benefit-to-cost ratio of projects, where new constructions or remediation interventions have to be planned
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