1,721,929 research outputs found
Il ritorno dell’Unlawful Enemy Combatant e l’individualizzazione dell’inimicizia: storia di una categoria giuridica ambigua e interpretazione del suo utilizzo contemporaneo
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Landslides triggered by multiple earthquakes: insights from the 2018 Lombok (Indonesia) events
No full textEarthquake-triggered landslides significantly contribute to worsening the impact of seismic events; thus, comprehensive landslide inventories are essential for improving seismic hazard assessment. During complex seismic sequences, landslides are triggered by more than one event and the final inventory reflects the spatial and temporal evolution of the sequence. Here, I analyze the landslides triggered by the 2018 Lombok (Indonesia) seismic sequence. I use high-resolution satellite imagery to map 4823 landslides triggered after the 05/08/2018 event (Mw 6.9) and 9319 landslides after the 19/08/2018 event (Mw 6.9). I analyze the distribution and evolution over time of landslide density and landslide area percentage. Despite the significant increase in number and cumulative area of the landslides, the 05/08 and 19/08 events share the maximum dimension of individual landslides; this suggests that the maximum intensity is equal for the two events, i.e., X on the Environmental Scale Intensity scale. I compare the distribution of landslides with macroseismic information provided by eyewitnesses through online questionnaires. Finally, I investigate the role of earthquake environmental effects within seismic sequences, showing that effects on the natural environment provide complementary information with respect to traditional intensity and felt reports
Work ability in workers with heart disease: assessing physical and psycho-social risks
No full textCardiovascular diseases are the main cause of death and disability in all industrialized countries, including Italy. Advances in acute phase treatment and increasingly effective rehabilitation programs have determined higher survival rates and a subsequent rise in disease prevalence in working age population. Hence the need for implementing social reintegration programs, including interventions aimed specifically at aiding the process of returning to work, in which the occupational physician plays a crucial role by means of assessing the compatibility between the workers residual clinical and functional capabilities and the characteristics of their job profile. On the basis of recent literature data, particular attention must be paid to occupational risks towards which cardiopathic patients are particularly susceptible, i.e. environmental risks (physical effort), organizational and psycho-social risks (workload and time pressure, shifts, job demand and control). A close collaboration between the occupation physician and the cardiologist to ensure an effective return to work process is highly recommended, as well as periodic re-evaluations of job placement adequacy that can also include clinical examinations, performed during working hours, of the degree of cardiovascular adaptation to working conditions
Blue moon approach to rare events
No full textThe "Blue Moon" ensemble is a computationally efficient molecular dynamics method to estimate the rate constants of rare activated events when the process can be described by a reaction coordinate xi(r), a well-defined function in configuration space. By means of holonomic constraints a number of values of (r) can be prescribed along the relevant path to identify the "bottleneck" region first and to sample an ensemble of starting conditions to generate activated trajectories. These MD trajectories sample phase space according to a biased configurational distribution. With a suitable re-weighting of averages from such ensemble of trajectories one can characterize completely rare events
Potential energy surface for rare gases adsorbed on Cu(111): Parameterization of the gas/metal interaction potential
No full textWe propose a model potential function to describe the interaction between rare-gas atoms and a metal surface with parameters derived on the basis of ab initio calculations. We discuss the merits of the proposed functional form for applications in molecular dynamics studies of nanotribology. © IOP Publishing Ltd
Conditional probability of distributed surface rupturing during normal-faulting earthquakes
Full text linkCoseismic surface faulting is a significant source of hazard for critical plants and distributive infrastructure; it may occur either on the principal fault or as distributed rupture on nearby faults. Hazard assessment for distributed faulting is based on empirical relations which, in the case of normal faults, were derived almost 15 years ago using a dataset of US earthquakes. We collected additional case histories worldwide, for a total of 21 earthquakes, and calculated the conditional probability of distributed faulting as a function of distance from the principal fault. We found no clear dependency on the magnitude nor the time of occurrence of the earthquakes, but our data consistently show a higher probability of rupture when compared with the scaling relations currently adopted in engineering practice. We derive updated empirical regressions and show that the results are strongly conditioned by the averaging of earthquakes effectively generating distributed faulting at a given distance and those which did not generate faulting; thus, we introduce a more conservative scenario that can be included in a logic tree approach to consider the full spectrum of potential ruptures. Our results can be applied in the framework of probabilistic assessment of fault displacement hazard
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