1,721,028 research outputs found
The rodents of the Pirro Nord fauna (Foggia, Southern Italy)
No full textThe rodent fauna of various fissure fillings of the Pirro Nord karstic complex are examined here. They have been collected during several field caingns starting from the 70’s until 2006 and are here examined in a comprehensive matter. Hundreds of specimens of arvicolids, murids and, in much lower amount, Glirids have been recovered from several of these fissures. They belong to the species Allophaiomys ex gr. ruffoi, Myodes sp. Apodemus flavicollis and Muscardinus sp
The endemic insular lineage Rhagapodemus-Rhagamys (Muridae, Rodentia) in Sardinia (Italy): systematics and phylogeny
No full textSome preliminary data on two small mammal bearing paleosols from the Tyrrhenian and Adriatic sides of Italy
No full textTwo Middle Pleistocene paleosols from the Tyrrhenian (Campani quarry, Pisa, Lower Valdarno) and
Adriatic (Catignano Pescara) sides of Italy, both covered by tephra layers, were studied for their paleontological content (molluscs and small mammals). At Campani quarry the volcanic ash level was dated by fission tracks both on glass (0.59±0.08 Ma; 0.62±0.07 Ma) and on the apatites (0.46±0.05 Ma). Stratigraphic evidences suggest a Middle Pleistocene age for Catignano paleosol. However, age determination on the apatites belonging to the Catignano volcanic level is currently under way.
The Campani quarry paleosol yielded a rich assemblage of land molluscs characterised by high species diversity indicating that a wooded environment developed in conditions of mild climate.The small mammal assemblage is dominated by murids, confirming the presence of a developed wood cover. Catignano paleosol shows a lower number for species of both small mammals and molluscs, the latter dominated by open ground and steppe taxa. A comparison between these two Middle Pleistocene levels shows that molluscs and small mammals data agree suggesting that different environmental conditions prevailed when the two paleosols developed
Microtus (Tyrrhenicola) sondaari n. sp. (Arvicolidae, Rodentia) from Monte Tuttavista (Sardinia, Italy)
No full textMicrotus (Tyrrhenicola) henseli is an endemic fossil vole widespread in Sardinia and Corsica during Middle Pleistocene to Holocene. Some analyses on new populations of M. (Tyrrhenicola) from the recently studied fissure fillings of Monte Tuttavista (Orosei, Western Sardinia) have been carried out, leading to the description of a new species of M. (Tyrrhenicola) more archaic than Microtus (Tyrrhenicola) henseli
The endemic vole Tyrrhenicola (Arvicolidae, Rodentia) from Monte Tuttavista (Sardinia, Italy): new perspectives for phylogeny and biochronology
No full textDesign of a high speed printed circuit board coreless axial flux permanent magnet machine
No full textThe use of printed circuit board stators in coreless axial flux permanent magnet machines allows to reduce manufacturing costs and to eliminate the main drawbacks of traditional implementations using Litz wire. This work investigates the design of a coreless axial flux permanent magnet machine having printed circuit board concentrated windings. The field model of the coreless machine is reviewed to obtain closed-form equations for torque, eddy current loss and circulating currents loss are presented. Furthermore, cardinal geometrical parameters of the printed circuit board stator and the latest manufacturing possibilities are investigated, followed by the presentation of important machine design details
A Comparative Study of Stator Winding Technologies for Coreless Axial Flux Permanent Magnet Machines
No full textRecently, axial flux permanent magnet machines with coreless windings have been proposed for many applications, from low-speed servo systems to high-speed electric propulsion. These machines have zero cogging torque and core losses, a highly linear behaviour, and remarkable overload capabilities. Conversely, thermal behaviour, efficiency, torque density and power density strongly depend on the specific stator winding technology. This paper reviews stator winding technologies for coreless axial flux permanent magnet (AFPM) machines, focusing on their potential benefits and limitations. Additional contributions include the analysis and comparison of different winding solutions for low-speed and high-speed machines. The presented results can be used as guidelines for the selection of the most appropriate winding technology for a number of practical applications
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