5,056 research outputs found
Impact of limitations in sediment supply on bed load transport in the instrumented catchment of the Rio Cordon, Italy
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Pechino 1955. Intellettuali e politici europei alla scoperta della Cina di Mao
No full textQuesto saggio studia i viaggi che gruppi di intellettuali e politici europei (soprattutto italiani e francesi) intrapresero alla volta di Pechino nel 1955. L’attrazione intellettuale verso il regime di Mao si concretizzò in seguito all’invito che il primo ministro Zhou Enlai rivolse all’opinione pubblica mondiale nel corso della conferenza di Bandung. Il suo messaggio («venite a vedere») fu raccolto entusiasticamente da quegli intellettuali che faticavano a trovare una collocazione nel contesto della politica della guerra fredda in Europa. L’autore mostra che la formazione del nuovo regime comunista stimolò nel discorso politico l’immagine di una terza via rivoluzionaria e democratica. Nel corso delle visite degli intellettuali occidentali, le autorità cinesi impiegarono i metodi che Mao aveva collaudato già durante la Lunga Marcia: «sicurezza, segretezza, cordialità e guide rosse». La volontà di credere dei visitatori rese il lavoro delle autorità più semplice. I viaggiatori infatti riportarono a casa l’immagine positiva di uno Stato-partito impegnato nello sforzo di sradicare la miseria e l’arretratezza. L’autore discute infine le ragioni per cui soltanto una parte dei viaggiatori si preoccupò della violazione dei diritti civili e delle libertà
Combined treatment with MAO-A inhibitor and MAO-B inhibitor increases extracellular noradrenaline levels more than MAO-A inhibitor alone through increases in β-phenylethylamine
No full textMonoamine oxidase inhibitors (MAO inhibitors) have been widely used as antidepressants. However, it remains unclear whether a difference exists between non-selective MAO inhibitors and selective MAO-A inhibitors in terms of their antidepressant effects. Using in vivo microdialysis methods, we measured extracellular noradrenaline and serotonin levels following administration of Ro 41-1049, a reversible MAO-A inhibitor and/or lazabemide, a reversible MAO-B inhibitor in the medial prefrontal cortex (mPFC) of rats. We examined the effect of local infusion of β-phenylethylamine to the mPFC of rats on extracellular noradrenaline and serotonin levels. Furthermore, the concentrations of β-phenylethylamine in the tissue of the mPFC after combined treatment with Ro 41-1049 and lazabemide were measured. The Ro 41-1049 alone and the combined treatment significantly increased extracellular noradrenaline levels compared with vehicle and lazabemide alone. Furthermore, the combined treatment increased noradrenaline levels significantly more than Ro 41-1049 alone did. The Ro 41-1049 alone and the combined treatment significantly increased extracellular serotonin levels compared with vehicle and lazabemide alone, but no difference in serotonin levels was found between the combined treatment group and the Ro 41-1049 group. Local infusion of low-dose β-phenylethylamine increased extracellular noradrenaline levels, but not that of serotonin. Only the combined treatment significantly increased β-phenylethylamine levels in tissues of the mPFC. Our results suggest that the combined treatment with a MAO-A inhibitor and a MAO-B inhibitor strengthens antidepressant effects because the combined treatment increases extracellular noradrenaline levels more than a MAO-A inhibitor alone through increases in β-phenylethylamine
Near-bankfull floods in an Alpine stream: Effects on the sediment mobility and bedload magnitude
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Symmetry Breaking of Tail-Clamped Filaments in Stokes Flow
No full textSymmetry breaking (SB) of fluid-structure interaction problems plays an important role in our understanding of animals' locomotive and sensing behaviors. In this Letter, we study the SB of flexible filaments clamped at one end and placed in a spanwise periodic array in Stokes flow. The equilibrium state of the filament along the streamwise direction loses stability and experiences two-dimensional and then three-dimensional SBs as the spanwise distance increases, or as the filament rigidity reduces. For slightly deformed filaments, the viscous and pressure forces are commensurate, while for extremely deformed filaments the viscous force becomes dominant
The response of a mountain drainage basin to extreme events: the impact of Vaia storm on Rio Cordon (Dolomites, Italy)
No full textCurrent literature is limited in understanding the responses of mountain basins to large disturbances, especially when it comes to integrating analyses of sediment transport, geomorphic changes, and topographical conditions, as these aspects are often examined at varying spatial scales. This manuscript explores the impact of the Vaia storm (27-30 October 2018) on the Rio Cordon Basin (Dolomites, Italy). Integrating data from three studies conducted at different spatial scales, it examines hydrological, geomorphological, and sedimentological responses of the basin to the large infrequent event. The findings encompass changes in channel network, step-pool morphology evolution, and sediment flux alterations. Streambed remobilization, boulder mobility, incision, and lateral erosion were observed. The step-pool morphology experienced disruption but recovered to stability within two years. Surprisingly, suspended sediment fluxes and yields after two years form the event (42 t km-2 years-1) were consistent with pre-Vaia conditions (40 t km-2 years-1). The integration of pre- and post-event data proved valuable for understanding the basin's responses to extreme events. Based on current conditions, Rio Cordon appears to be returning to a pre-event state, establishing a new dynamic equilibrium, as the Vaia event induced morphological changes while sediment fluxes and step-pool stability remained in line with pre-event conditions
DYNAMIC SEDIMENT CONNECTIVITY OF PORTIONS OF A MOUNTAIN BASIN DURING AN ORDINARY ABLATION SEASON
No full textBedload dynamics in steep mountain rivers: Insights from the Rio Cordon experimental station (Italian Alps)
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