Time filter

Source Type

Genève, Switzerland

Arduini G.,CER
Proceedings - Chamonix 2012 Workshop on LHC Performance

Based on the 2011 experience and Machine Development study results the performance reach of the LHC with 25 and 50 ns beams will be addressed for operation at 3.5 and 4 TeV. The possible scrubbing scenarios and potential intensity limitations resulting from vacuum, heating will be taken into account wherever possible. The paper mainly covers the performance of the two high luminosity regions in IR1 and IR5. Source

Chevalier C.,University Paris Est Creteil | Herrier G.,Lhoist Recherche and Developpement | Charles I.,CER
Geotechnical Engineering for Infrastructure and Development - Proceedings of the XVI European Conference on Soil Mechanics and Geotechnical Engineering, ECSMGE 2015

Lime- Treatment of soils is a process that can bring better workability of silty and clayey materials, and once compacted, strong mechanical properties. A growing field of research and development is the way lime- Treated soils behave in the context of hydraulic earthworks, where the properties of the materials vs water is essential. In this paper, we will focus on the behavior of treated materials towards erosion processes and water effects by studies both in laboratory and on 2 full-scale experimental dry dikes. Comparisons have been carried out between raw and treated materials at different ages of lime treatment. Three types of tests were used: Mobile Jets Erosion Test (an apparatus that can be used either in laboratory or on the field), Hole Erosion Test (an efficient and convenient laboratory apparatus) and Enhanced Crumb Test (an evolution of ASTM Crumb Test). In all configurations (soil and apparatus), this study reports a great increase of the resistance to erosion of the treated materials which leads to a significant reduction in the risk of both internal and surface erosion on earthworks. © The authors and ICE Publishing: All rights reserved 2015. Source

Losciale P.,Italian Agricultural Research Council | Manfrini L.,University of Bologna | Morandi B.,University of Bologna | Novak B.,University of Bologna | And 5 more authors.
Acta Horticulturae

Under water restriction, stomatal closure limits photosynthesis (Pn) leading to a dangerous energy excess. Non-photochemical quenching (NPQ) and non-net carboxylative transports (NC: alternative electron transports and photorespiration) cooperate in dissipating the energy surplus by consuming energy and CO2. Leaf and fruit behaviour were evaluated on 'Abbé Fetel' pear, grafted on Adams and Sydo and irrigated with 100(T100), 50(T50), 25 (T25) and 0% (T0) of the estimated evapotranspiration, during the whole season. At fruit cell expansion Pn and stomatal conductance (gs) decreased in T25 and T0, in Adams, where the energy surplus was dissipated via NC. In Sydo, Pn and gs reductions occurred already in T50, indicating its higher drought susceptibility. The energy surplus was dissipated via NPQ in addition to NC. At the end of fruit cell expansion, the difference between the two rootstocks was maintained. Water-limited treatments (T25 and T0 for Adams; T50, T25 and T0 for Sydo) dissipated the energy surplus increasing NPQ and NC, indicating the pivotal role of these photoprotective pathways under drought stress. At this stage, water limitation reduced gs but did not decrease the internal CO2 concentration. This suggests that photosynthesis was not completely carbon limited and stomatal closure reduced leaf thermo-regulation raising leaf temperature, causing heat inhibition and affecting the Rubisco photorespiratory activity. The higher drought susceptibility of Sydo was observed also in fruit yields which were lower than in Adams. Source

Losciale P.,Italian Agricultural Research Council | Anconelli S.,CER | Galli F.,Foundation for Agriculture Fratelli Navarra | Manfrini L.,University of Bologna | And 5 more authors.
Acta Horticulturae

The availability of high quality water resources is becoming increasingly limited, and has been identified as a global problem. Agriculture must learn to operate under water scarcity, where insufficient supply will be the norm rather than the exception, developing more efficient water management practices that enable production under a limited supply. Under water restriction stomatal limitation reduces leaf photosynthesis. To compensate for energy imbalance, alternative electron pathways become increasingly active. These pathways reduce the photodamage risk while consuming energy and CO2 (e.g., photorespiration). For tree crops one agronomic strategy to cope with drought is to use water stress tolerant rootstocks. The aim of this study was to evaluate three pear rootstocks subjected to water restriction. Leaf performance and tree productivity were evaluated on 'Abbé Fetel' pears grafted on three different quince rootstocks (Adams, MH and Sydo), fully watered or irrigated with 50% of the recommended dosage. During the end of fruit cell division stage, leaf photosynthesis, stomatal conductance, and the alternative electron transports were unaffected by water restriction. However, differences were recorded between the three rootstocks. MH showed the highest values of leaf photosynthesis but was less stomatal limited. During the following stage of fruit cell expansion the interaction between rootstocks and water treatment was significant. Water restriction was more effective in the Sydo rootstock, which reduced photosynthesis and stomatal conductance, increasing the activity of the alternative electron transports. This behaviour was reflected in fruit productivity, which was reduced in Sydo under water stress. These results suggest the possibility to improve irrigation management in pear via a better understanding of plant behaviour at leaf and fruit level during its vegetative season, in combination with the choice of the most appropriate rootstock. Source

Cer | Date: 2010-03-22

This machine for marking or labeling circularly symmetrical workpieces comprises a marking or labeling member, means for moving the member and a workpiece relative to each other in a first direction, and a cradle suitable for holding a workpiece while it is being marked or while a label is being applied to it. Said cradle is provided with means for driving the workpiece in rotation around the axis of revolution thereof. A drive carriage makes it possible to drive the cradle in translation in a second direction that is perpendicular to the first direction. Means make it possible to drive the carriage in translation in a third direction that is perpendicular to the first and second directions. Other means make it possible to drive the cradle relative to the carriage in rotation about a first axis that is parallel to the first direction.

Discover hidden collaborations