Aplicación del método de anisotropía de susceptibilidad magnética en neotectónica : caso de estudio Valle de Aburrá y alrededores

La anisotropía de susceptibilidad magnética (ASM) es un método que permite caracterizar la fábrica magnética de rocas y sedimentos, y ésta a su vez sirve para estimar el tipo de deformación tectónica generada por un campo de esfuerzos. En la zona de influencia de una falla activa, la fábrica magnética permite medir la deformación tectónica asociada al desplazamiento de dicha estructura, además, si esta deformación se encuentra impresa en depósitos cuaternarios, es posible estimar la geometría y la cinemática de estas fallas y contribuir al conocimiento neotectónico de una región. Este trabajo explora la aplicación de las técnicas de ASM sobre depósitos cuaternarios deformados que cubren fallas activas con el objetivo de brindar información acerca de la geometría y cinemática de fallas con desplazamientos recientes en el borde oriental y occidental del Valle de Aburrá, donde se han reportado sitios de interés neotectónico. Los resultados obtenidos sugieren que existe una relación en la deformación para ambos lados del Valle de Aburrá debido a las similitudes en los esfuerzos máximos y mínimos y a la anisotropía presente en cada punto de interés. Finalmente, se concluye que la aplicación de ASM en sedimentos deformados por fallas activas suministra información fundamental para la calibración de los modelos de evolución tectónica y la evaluación de la amenaza sísmica en el Área metropolitana del Valle de Aburrá y de los sectores aledaños a este.Magnetic susceptibility anisotropy (ASM) is a method that allows characterizing the magnetic factory of rocks and sediments, and this in turn serves to estimate the type of tectonic deformation generated by a stress field. In the zone of influence of an active fault, the magnetic factory allows to measure the tectonic deformation associated with the displacement of said structure, in addition, if this deformation is printed in quaternary deposits, it is possible to estimate the geometry and kinematics of these faults and contribute to the neotectonic knowledge of a region. This work explores the application of ASM techniques on deformed quaternary deposits that cover active faults with the aim of providing information about the geometry and kinematics of faults with recent displacements in the eastern and western edge of the Aburrá Valley, where they have been reported neotectonic sites of interest. The results obtained suggest that there is a relationship in deformation for both sides of the Aburrá Valley due to the similarities in the maximum and minimum stresses and the anisotropy present at each point of interest. Finally, it is concluded that the application of ASM in sediments deformed by active faults provides fundamental information for the calibration of the models of tectonic evolution and the evaluation of the seismic threat in the metropolitan area of the Valle de Aburrá and its neighboring sector

Dante nelle letterature straniere

Il volume offre un incrocio di sguardi critici sulle rotte percorse dall’opera dantesca nelle letterature straniere. A settecento anni dalla sua morte, la voce di Dante continua a oltrepassare confini permeando immaginari lontani, in un incedere di evocazioni, traduzioni, interpretazioni e riscritture. I venti saggi qui presentati tratteggiano un itinerario di esplorazione delle tracce dantesche nelle tradizioni letterarie di Albania, Svezia, Francia, Cuba, Polonia, Stati Uniti, Germania, Argentina, Danimarca, Scozia, Inghilterra e Messico. Le diverse latitudini abbracciate si articolano in una raccolta di studi che dall’epoca moderna confluisce nell’estremo contemporaneo, calibrando nuovi orizzonti e prospettive nello sconfinato territorio della critica dantesca. Gli autori e le autrici illuminano storie di ricezione, riletture e dialoghi intertestuali nei quali la memoria della Commedia si riconfigura in un’inesauribile pluralità di scritture, di cui si intende consegnare in queste pagine uno sguardo di carattere esplorativo e non antologico. La parola di Dante attraversa lingue e universi letterarioculturali senza tradirsi ma conoscendo nuove fioriture: confermandosi una parola necessaria, profetica e viva

Racial differences in systemic sclerosis disease presentation: a European Scleroderma Trials and Research group study

Objectives. Racial factors play a significant role in SSc. We evaluated differences in SSc presentations between white patients (WP), Asian patients (AP) and black patients (BP) and analysed the effects of geographical locations.Methods. SSc characteristics of patients from the EUSTAR cohort were cross-sectionally compared across racial groups using survival and multiple logistic regression analyses.Results. The study included 9162 WP, 341 AP and 181 BP. AP developed the first non-RP feature faster than WP but slower than BP. AP were less frequently anti-centromere (ACA; odds ratio (OR) = 0.4, P < 0.001) and more frequently anti-topoisomerase-I autoantibodies (ATA) positive (OR = 1.2, P = 0.068), while BP were less likely to be ACA and ATA positive than were WP [OR(ACA) = 0.3, P < 0.001; OR(ATA) = 0.5, P = 0.020]. AP had less often (OR = 0.7, P = 0.06) and BP more often (OR = 2.7, P < 0.001) diffuse skin involvement than had WP.AP and BP were more likely to have pulmonary hypertension [OR(AP) = 2.6, P < 0.001; OR(BP) = 2.7, P = 0.03 vs WP] and a reduced forced vital capacity [OR(AP) = 2.5, P < 0.001; OR(BP) = 2.4, P < 0.004] than were WP. AP more often had an impaired diffusing capacity of the lung than had BP and WP [OR(AP vs BP) = 1.9, P = 0.038; OR(AP vs WP) = 2.4, P < 0.001]. After RP onset, AP and BP had a higher hazard to die than had WP [hazard ratio (HR) (AP) = 1.6, P = 0.011; HR(BP) = 2.1, P < 0.001].Conclusion. Compared with WP, and mostly independent of geographical location, AP have a faster and earlier disease onset with high prevalences of ATA, pulmonary hypertension and forced vital capacity impairment and higher mortality. BP had the fastest disease onset, a high prevalence of diffuse skin involvement and nominally the highest mortality

ANKLE ULTRASOUND TENOSYNOVITIS IS A SIGNIFICANT PREDICTOR OF DAS28 – DEFINED RHEUMATOID ARTHRITIS ACTIVITY

Objective. The study aimed to observe the frequency of ultrasound-defined tenosynovitis in ankle tendon and to evaluate the relationship of ankle tenosynovitis with clinical examination and rheumatoid arthritis (RA) activity measures. Methods. RA patients were recruited in 2018 in the random order of presentation from the out-patient clinic. On the same day of inclusion, all patients underwent clinical examination, laboratory tests (inflammatory markers), ankle ultrasound and patient-reported outcomes. Results. the study included 183 patients with established RA, mostly women (86.3%), with mean age of 57.3 years. The most frequent tenosynovitis was observed in the tibialis posterior tendon (TP; 40.4%), followed by the peroneus longus (23.0%) and peroneus brevis (18.0%) tendons. Compared to patients without TP tenosynovitis, patients with TP tenosynovitis had significantly higher titres of rheumatoid factors (RF; median of 123 IU/mL compared to 64 IU/mL; p = 0.023). Clinically tender (55.2%) and swollen (30.6%) ankles were 4.2 and respectively 11.6 times more likely to reveal tenosynovitis on ultrasound. The presence of ankle tenosynovitis was associated with higher disease activity measures. DAS28 increased proportionally and significantly with the number of ankles with tenosynovitis, the grade of ankle tenosynovitis and power Doppler activity. The absence of ankle tenosynovitis independently and significantly decreased DAS28 with 1.2 points (p < 0.001). Conclusions. the most frequent ankle tenosynovitis observed in RA patients involves the TP tendon, which is associated with higher titres of RF. Swollen ankles are more specific and better predictors of ultrasound-defined ankle tenosynovitis, which has a directly proportional relationship with disease activity in RA. Disease activity scores should include clinical evaluation of ankles and ultrasound information

La gestione degli errori per l’apprendimento organizzativo: rappresentazioni ed emozioni nel racconto di episodi di errori.

Introduzione: La letteratura recente sul tema degli errori evidenzia come questi possano essere determinati da fattori non solo di livello individuale ma anche organizzativo, connessi ai processi produttivi (Reason 2008) e alla cultura (van Dyck al 2005). Culture organizzative orientate all’error aversion ovvero all’error management, inducono rispettivamente la negazione e copertura delle azioni erronee ovvero l’utilizzo del feedback negativo per generare apprendimento organizzativo (Hofmann & Frese 2011). Gli aspetti caratterizzanti la cultura dell’errore risultano tuttavia ancora poco studiati. Obiettivi e Metodi: Lo studio, parte di una ricerca più ampia, si propone di esplorare le rappresentazioni degli errori organizzativi, con particolare attenzione al ruolo giocato dalle emozioni nei processi di gestione degli errori (management vs aversion). Attraverso un’intervista semi-strutturata basata sul racconto di casi critici (Flanagan 1954) e di un questionario sul tema dell’error culture (van Dyck et al 2005) proposti a 60 lavoratori di diversi contesti organizzativi, è stata svolta l’analisi dei contenuti. In particolare, su un corpus di 64.182 occorrenze e 156 testi, sono state svolte a) una cluster analysis (T-Lab), b) l’analisi delle emozioni espresse dai soggetti nei racconti, codificate e accorpate in categorie più ampie (Atlas.ti), c) l’analisi della relazione tra le tipologie di emozioni individuate e le percezioni dei soggetti relative alla cultura dell’errore presente nel proprio contesto (SPSS). Risultati: I risultati delle diverse analisi fanno emergere quattro principali modelli di rappresentazione degli errori. Vengono inoltre individuate le tipologie prevalenti di emozioni spontaneamente associate dai soggetti che operano in contesti lavorativi con diverso orientamento culturale verso gli errori. Conclusioni: Complessivamente, lo studio contribuisce a delineare il processo che sostiene un orientamento culturale favorevole alla gestione degli errori, cogliendo il potenziale di apprendimento che essi racchiudono