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( Alessandro Simoni ),( Benedikt Bayer ),( Matteo Berti ),( Silvia Franceschini ),( Gabriela Squarzoni ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
In this work we back-analyze two landslide failures that occurred in the Northern Apennines of Italy, in terms of surface movements and their relation with rainfalls. The two landslides have some similarities in that they are historical earthflows characterized by relatively long period of slow-moving stable sliding that can be interrupted by rapid acceleration and catastrophic failure. In both cases, the catastrophic failures were sudden and unexpected, causing problems to infrastructures (roads and railways) located at the toe of the landslides. We process interferograms of SAR images acquired by Sentinel 1 A/B with time spans ranging from 6 to 24 days, removing those having low coherence by manual inspection. The conventional 2-pass technique allowed us to obtain measurements of surface displacement despite the fact that no infrastructures nor major reflectors are present on landslide bodies. Our interferograms show that surface displacements are well visible since 2015. They display nearly continuous downslope motion with seasonal velocity changes. Time series between 2015 and 2018 shows that surface displacements can be appreciated throughout most part of the year with snow cover and summer peak of vegetation being the most notable exceptions. Distinct accelerations can be detected in space and time during the weeks and months preceding the catastrophic failures. We compare time-dependent deformations to precipitation patterns to explore interactions between precipitation and landslide kinematics and to document the transition from stable to unstable sliding. Our work indicate that InSAR interferometry can be successfully used to anticipate catastrophic failure.
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( Gaetano Alfano ),( Annachiara Ferrari ),( Francesco Fontana ),( Giacomo Mori ),( Giulia Ligabue ),( Silvia Giovanella ),( Riccardo Magistroni ),( Marianna Meschiari ),( Erica Franceschini ),( Marian 대한신장학회 2021 Kidney Research and Clinical Practice Vol.40 No.2
Background: The prognostic value of within-day sCr variation serum creatinine variation is unknown in the setting of the novel corona virus disease 2019 (COVID-19). We evaluated the prognostic significance of 24-hour serum creatinine variation in COVID-19 patients. Methods: A monocentric retrospective analysis was conducted in COVID-19 patients not admitted to the intensive care unit. Three groups were subdivided based on 24 hours serum creatinine variation from admission. In the stable kidney function group, 24-hour serum creatinine variation ranged from +0.05 to -0.05 mg/dL; in the decreased kidney function group, 24-hour serum creatinine variation was >0.05 mg/dL; in the improved kidney function group, 24-hour serum creatinine variation was <-0.05 mg/dL. Results: The study population included 224 patients with a median age of 66.5 years and a predominance of males (72.3%). Within 24 hours of admission, renal function remained stable in 37.1% of the subjects, whereas it displayed improved and deteriorated pat terns in 45.5% and 17.4%, respectively. Patients with decreased kidney function were older and had more severe COVID-19 symp toms than patients with stable or improved kidney function. About half of patients with decreased kidney function developed an epi sode of acute kidney injury (AKI) during hospitalization. Decreased kidney function was significantly associated with AKI during hospi talization (hazard ratio [HR], 4.6; 95% confidence interval [CI], 1.9-10.8; p < 0.001) and was an independent risk factor for 30-day in-hospital mortality (HR, 5.5; 95% CI, 1.1-28; p = 0.037). Conclusion: COVID-19 patients with decreased kidney function within 24 hours of admission were at high risk of AKI and 30-day in-hospital mortality.
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