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Sintomi guida addominali - considerazioni diagnostico-differenziali e cenni di diagnosi strumentale
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EFFICACIA DELLA GASTRECTOMIA SUBTOTALE ASSOCIATA A LINFOADENECTOMIA DI II LIVELLO NELLA TERAPIA CHIRURGICA DELL'EARLY GASTRIC CANCER
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Comparison of conditions v=0 and a-n=0 on conductor boundaries in ajv-a-h' formulations
No full textIn a previous paper the authors proposed a Coulomb gauge A,V-A-psi formulation for quasi-static transient eddy current problems using V=0, instead of A . n=0, as guage condition on the conductor boundary. Further numerical experimentation using either V=0 or A . n=0 on different parts of the conductor boundary, however, has shown that, rather unexpectedly, J . n=0 is numerically more weakly enforced where V=0 is used. Hence, in spite of some advantages of V=0, A . n=0 still seems to be a better choice, after all. A theoretical explanation for this unexpected drawback of V=0 has been found and is presented here in detail
Ground/sea return with electrode systems for HVDC transmission
No full textHVDC transmission is booming worldwide. Despite electrode systems are one of the frontiers of DC technology, being a key component of HVDC links, in the experience of the Authors many aspects of their manufacturing, design and operations are less known among the HVDC community with respect to other components, like cables and converters. Aiming at filling this gap, this paper is a survey on ground/sea return with electrode systems for HVDC links, particularly focused on the preliminary design. The configurations of HVDC systems (monopolar, homopolar, bipolar) are recalled first, highlighting the advantages of ground/sea return. Then, ground electrodes are treated, illustrating the basic parameters and geometrical arrangements for the design of ground electrodes. Later, shore and sea electrodes are illustrated. Considerations relevant to ground current close the paper
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