170,526 research outputs found
E' naturale essere naturalisti
No full textSaggi contenuti:
Carola Barbero, Mario De Caro, Alberto Voltolini, Introduzione
Michele Di Francesco, La penultima verità? Naturalismo e neurofilosofia
Francesco Ferretti, Coevoluzionismo senza se e senza ma
Maurizio Ferraris, Scrittura, archiscrittura, pensiero
Paolo Tripodi, Wittgenstein e il naturalismo
Marilena Andronico, Dall’interno dello schema: Per un naturalismoontologico non riduzionista
Alfredo Paternoster, Essere un soggetto è un fenomeno naturale?
Nicla Vassallo, Su naturalismi e filosofie femministe in relazione a cognizione e conoscenza
Elisabetta Sacchi, Il contributo di Frege all’attuale dibattito sul naturalismo
Mario De Caro, Alberto Voltolini, Il migliore dei naturalismi possibili
Stephen White, L’assenza dell’interfaccia: Putnam, la percezione diretta e il vincolo di Frege (con una risposta di Hilary Putnam
In-situ 4D visualization and analysis of temperature-driven creep in an oil shale propped fracture
No full textThe proppant embedment due to creep in shales is a known issue affecting the useable lifetime of wells in unconventional oil and gas recovery. One of the factors influencing creep is the presence of organics, whose properties can be very sensitive to temperature. In this work we investigated for the first time the role of temperature-induced creep increase in proppant embedment in an organics-rich Green River oil shale sample via in-situ synchrotron X-ray micro-computed tomography. We observed that temperatures as low as 75 degrees C already induce fast creep, with a fracture aperture closing rate of 13 mu m/h and a loss of fracture conductivity rate of 8.7%/h, due only to proppant embedment, in the measured interval at the first heating stage. Local displacement data analysis provided evidence for markedly plastic deformation around the proppant-shale contacts, in contrast with the brittle proppant embedment observed on more cemented and less organics-rich shales at room temperature. The results highlight how the problem of temperature-dependent mechanical behavior might be more important than previously thought, in shales with a high content in organics, and that in-situ micro-imaging techniques can play a key role in understanding the underlying mechanisms, contributing to solve creep-related problems associated with hydraulic fracturing in complex scenarios
Multifractal Analysis of Calcium Silicate Hydrate (C–S–H) Mapped by X-ray Diffraction Microtomography
No full textAn investigation of Calcium Silicate Hydrate (C–S–H) topological distribution and modes of precipitation is performed by combining X-ray powder diffraction tomography, performed on an ordinary Portland cement sample, with a numerical scheme that simulates C–S–H precipitation. C–S–H distribution maps obtained both experimentally and numerically are analyzed by means of a quantitative method based on the principles of multifractal systems. The combination of these methods allows C–S–H spatial distribution and modes of precipitation and aggregation to be assessed quantitatively. In particular, the multifractal spectra obtained from the digital images of the cement paste microstructure, act as a structural probe, which is able to quantify the tendency of C–S–H to form clusters. The results of this combined approach suggest that a multifractal network forms by aggregation of C–S–H clusters heterogeneously nucleated on clinker grains and preexisting clusters that are partly homogeneously nucleated in the porous space
Pattern of recurrence and survival of c-Ia NSCLC diagnosed by transpleural methods
No full textAim. The aim of this study was to evaluate if transpleural diagnostic methods as percutaneous fineneedle aspiration biopsy (FNAB) or tumour wedge resection by video-assisted thoracoscopic surgery (VATS) impact on local recurrence and long term survival of patients affected by non-small cell lung cancer (NSCLC). Methods. Records concerning 179 patients with peripheral c-Ia NSCLC who underwent complete resection from 1994 to 2000 have been reviewed. Patients were randomized into two groups according to the diagnostic method employed, as follows: in group I (N.=63) diagnosis was obtained by bronchoscopy; in group II (N.=116) diagnosis was obtained by FNAB (N.=59) or tumour wedge resection by VATS (N.=57) after a negative bronchoscopy. Survival curves were compared using log-rank test. Distribution of frequencies was analyzed with Chi-square and Fisher's exact test. Results. The two groups of patients did not significantly differ in terms of age, gender, forced expiratory volume in 1 second, comorbidities, histological type and tumour size; pathologic stage IIb was more frequent in group I. At a median follow-up of 48 months, (range 2-108 months), local recurrence was found in 9.5% (N.=6) of the patients in group I and in 12.5% (N.=15) of patients in group II (P=NS); distant metastasis were found in 28.6% (N.=18) of patients in group I and in 13.8% (N.=16) in group II (P=0.03). Patients in group II had a statistically better five-year survival rate than patients in group I (70% and 55% respectively P=0.016). Conclusion. FNAB and tumour wedge resection by VATS represent valuable diagnostic methods for lung cancers, since they do not seem to increase the risk of local recurrence. On the other hand, tumours diagnosed by bronchoscopy have a worse prognosis, that may be related to their higher metastatic potential rather than to diagnostic procedure itself
The dissolution of laumontite in acidic aqueous solutions: a controlled-temperature in situ atomic force microscopy study
No full textThe behavior of the zeolite laumontite during dissolution in acidic aqueous solutions has been studied by fluid-cell atomic force microscopy, with a focus on the role of the framework Al atoms in controlling the dissolution mechanisms. Isothermal single etch pits dissolution rates have been measured in situ at three different temperatures (11, 23, and 40 °C) on the (110) surface, and at one temperature (22 °C) on (201). The experimentally derived apparent activation energy of the development of the etch pits (E = 11.9 ± 4 kJ/mol) on the (110) surface and their morphology can be interpreted considering the structural features of laumontite, especially the crystallochemical distribution of the Al atoms in the framework. Preliminary comparison of the dissolution features of laumontite with those measured on zeolites with different Si/Al ratios and Al distribution further confirm the controlling role of the structural Al in the dissolution process
Levels of antibodies against protein C and protein S in pregnancy and in preeclampsia
No full textObjectives.The clinical relevance of antibodies anti-protein C and anti-protein S in pregnancy remains controversial. We evaluate whether, in the absence of thrombophilic diseases, maternal plasma levels of antibodies (IgM and IgG) change during pregnancy and in preeclampsia (PE), with and without superimposed fetal growth restriction (FGR). Methods.A retrospective cohort of 50 women with PE (n=30) and PE+FGR (n=20) and 70 controls [first trimester (n=20); second trimester (n=20); third trimester (n=30)] were enrolled in the study. Results.In healthy pregnant women, plasma levels of anti-protein C antibodies decreased from first to third trimester and were below the range of positivity. IgM anti-protein-C and anti-protein-S were significantly higher (P < 0.001) in both PE (23.88 ± 10.65 MoM and 43.90 ± 20.45 MoM, respectively) and PE+FGR group (15.95 ± 12.62 MoM and 36.02 ± 27.43 MoM, respectively) than in control group (2.23 ± 3.23 MoM and 1.68 ± 4.075 MoM, respectively), in the presence of unchanged levels of IgG isotype. Conclusions.In this study, we first found that the production of anti-protein C and anti-protein S antibodies decreases throughout healthy pregnancies, while they circulate in high levels in women with PE and PEFGR. © 2009 Informa Healthcare USA, Inc
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Il Museo archeologico delle Marche. Un'epopea museale
No full textPublished as part of the initiatives proposed by the Directorate General for Museums of the Ministry of Culture, the paper presents the results of recent research on the history and dynamics of musealisation of archaeological collections in the Marche region. The text presents research elements regarding the communication of museum values to the public
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