195,996 research outputs found
Coordinates of cycloids on Europa
No full textSupporting information for: Poinelli, M., Larour, E., Castillo-Rogez, J., & Vermeersen, B. (2019). Crevasse propagation on brittle ice: Application to cycloids on Europa. Geophysical Research Letters, 46, 1–8. https://doi.org/10.1029/2019GL084033
The file called Cycloids.csv includes coordinates of 4 cycloids on the surface of the Jovian moon Europa.
Europa reference radius is 1562 km.
Latitude type is planetocentric. Longitude direction is positive west while longitude domain is: 0 to 360.</p
Common agricultural policy: a European journey - then, now and the future
No full textUnderstanding the evolution of the Common Agricultural Policy (CAP) during the last decade would need a glimpse of the transformation of the political, economic and social landscape in which the European Union (EU) operates and in which, its agricultural policy is allocated. Since the Mac Sharry reform of 1992, the CAP went under a gradual reform process, conditioned by internal and external factors affecting the agricultural sector. As with other EU reforms, changes in the CAP revealed that for them to be successful, they must be anchored or built upon their past achievements. Fast or discontinuous changes often reveal a non-feasible option. These past achievements must, however, be reviewed in the context of newly emerging factors of influence shaping the Union and the CAP. The main factors that have been driving the EU reform process can be grouped in the following categories: external factors, such as the Monetary Union and the Enlargement; internal factors, such as societal concerns about food safety, environmental conditions and animal welfare; and such other factors as the need to review the financing mechanism, the influence of structural adjustments, the impact of multilateral commitments and the position that EU hopes to occupy in the future global world
I residui disponibili dalle lavorazioni agroindustriali e del legno a livello comunitario.
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L'impatto sul sistema agroalimentare veneto dei nuovi scenari europei: revisione di medio periodo della PAC e adesione alla UE dei Paesi PECO
No full textRapporto sul sistema agroalimentare del Venet
Ocean Dynamics and Ice Fractures: Insights from Earth and Beyond
No full textIce, a pervasive element across the Solar System, holds immense importance in understanding the response of the Earth to ongoing climate change as well as the dynamics of planetary bodies. This dissertation investigates ice fractures on terrestrial and planetary ice bodies, focusing on their impact on the melting of ice shelves in Antarctica and their dynamics on Europa, one of Jupiter’s moons.The urgency to understand the behavior of terrestrial ice shelves under environmental forcing is driven by the ongoing climate crisis. Antarctica is experiencing a rapid loss of mass, primarily due to increasing ocean-induced melting at the base of its ice shelves in response to global warming. The release of glacier meltwater into the world’s oceans contributes to arising the global sea level. However, the rate and magnitude of sea-level rise are highly uncertain and the potential ice mass-loss from Antarctica could significantly accelerate sea-level rise throughout this century due to the instability of its ice shelves. Thus, accurately projecting Antarctica’s contribution to global sea level necessitates a better understanding of the processes behind the loss of its ice shelves.In this dissertation, I examine the thinning of Antarctic ice shelves caused by enhanced melting at their base due to warming oceans. Intrusion of ocean heat beneath the ice shelves indeed plays a crucial role in projecting their future. Through idealized ocean modeling using the Massachussetts Institute of Technology general circulation model (MITgcm), I simulate ocean dynamics under the ice, investigating the impact of fractures and ice front retreat on the sub-shelf ocean circulation. Results indicate that fractures may act as barriers, inhibiting the intrusion of warm water towards the inland sections of the ice shelves, and thereby reducing basal melt. Furthermore, I examine the impact of the separation of iceberg A-68 from the Larsen C ice shelf in July 2017 on the sub-shelf ocean dynamics. This specific retreat event leads to the redistribution of heat under the ice, resulting in enhanced melting in specific sections of the ice shelf, suggesting future destabilisation of Larsen C. These findings highlight the importance of considering updated ice-shelf coastlines to accurately project ocean circulation and its implications for ice shelf stability.Furthermore, this dissertation explores the dynamics of specific lineament features observed on the surface of Europa, which are identified as ice fractures. Although limited observations restrict our understanding of ice fracturing events on this moon, insights from studying terrestrial ice sheets provide valuable knowledge. By extend ing an existing terrestrial-based numerical model of fracture propagation on ice shelves, I show that some lineaments on the surface of Europa exhibit a behavior that is similar to ice fractures on Antarctic ice shelves. The model depicts the evolution of these lineament features as bursts of fracture propagation events interspersed with periods of inactivity, which is a typical behavior of fractures on terrestrial ice shelves. Overall, this dissertation shows the potential for synergy between Earth and planetary science. By leveraging advances in our understanding of physical processes on Earth, terrestrial-based models and theories contribute to expanding our knowledge of physics on other celestial bodies. This interdisciplinary approach, supported and validated by remote sensing and in-situ missions, is fundamental in order to advance our understanding of ice fractures, their interaction with the surrounding environment and their dynamics throughout the Solar System. On Earth, a better understanding of the dynamics of Antarctic ice shelves is imperative to correctly project Antarctica’s contribution to global sea level.Physical and Space Geodes
Physical processes controlling the rifting of Larsen C Ice Shelf, Antarctica, prior to the calving of iceberg A68
No full textThe sudden propagation of a major preexisting rift (full-thickness crack) in late 2016 on the Larsen C Ice Shelf, Antarctica led to the calving of tabular iceberg A68 in July 2017, one of the largest icebergs on record, posing a threat for the stability of the remaining ice shelf. As with other ice shelves, the physical processes that led to the activation of the A68 rift and controlled its propagation have not been elucidated. Here, we model the response of the ice shelf stress balance to ice shelf thinning and thinning of the ice mélange encased in and around preexisting rifts. We find that ice shelf thinning does not reactivate the rifts, but heals them. In contrast, thinning of the mélange controls the opening rate of the rift, with an above-linear dependence on thinning. The simulations indicate that thinning of the ice mélange by 10 to 20 m is sufficient to reactivate the rifts and trigger a major calving event, thereby establishing a link between climate forcing and ice shelf retreat that has not been included in ice sheet models. Rift activation could initiate ice shelf retreat decades prior to hydrofracture caused by water ponding at the ice shelf surface.Physical and Space Geodes
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
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