1,720,976 research outputs found
Influenza del comportamento reale del gas sulle prestazioni degli accumulatori idro-pneumatici impiegati nei sistemi di frenata rigenerativa dei veicoli
No full textDesign criteria and methodology of a Multi-Rim Carbon-fibre Flywheel to be integrated within a Large-Airgap PMSM
Full text linkThe design of an Inner-Rotor Large-Airgap Permanent Magnet Synchronous Machine (IRLA-PMSM) is presented in this paper, whose distinctive feature consists of integrating a thick carbon-fibre cylindrical layer that acts as both a sleeve and a flywheel. This results in large airgap and makes simplified mechanical modelling generally used for sleeve design no more suitable. Therefore, an advanced mechanical modelling is presented in the paper, which is combined with an electromagnetic and energy modelling in order to make the analytical design procedure compliant with all the design targets and constraints. The proposed IRLA-PMSM is validated through finite element analyses, which regard both mechanical and electromagnetic aspects at different operating conditions
Free functional muscle transfers
No full textFree-functioning muscle transfer is done to replace lost muscle and tendon-unit function through microvascular anastomosis in the recipient area. Neural coaptation of the transferred muscle's motor nerve provides the ability of the muscle to contract, giving functionality to the transfer. It is a complex surgical technique with limited indications and prolonged patient recovery. Free functional muscle transfer represents the last chance after conservative approaches have been exhausted and functional deficiencies persist after a trauma, oncologic resection, congenital defect or acquired deficiencies. The manuscript is structured in paragraphs covering indications, patient selection, the surgical technique, complications and future prospective. It furthermore presents through detailed descriptions and photographic material clinical cases from our practice
Characterization of pulling forces exerted by primary school children while carrying trolley bags
No full textCarriage of school items by children remains an issue of concern, mainly due to the large loads they have to bear, starting from early age when the musculoskeletal structure is still under development. As such, children are potentially exposed to important risks of acute or chronic injuries due to such carriage. While backpack remains the most common modality, in recent years trolley bags are increasingly considered and used. Trolleys may be of benefit, as much of the load can supported by the ground, and the muscular effort is limited to a pulling force. Nevertheless, there are situations (like stair ascent and descent, steps, and ramps) where the pulling force increases or, in some cases, has to be fully supported by a single arm. Under such conditions, the use of trolley bag might be disadvantageous versus a backpack, in that the latter allows a symmetrical distribution of the load on the body in a range of conditions. To provide more empirical evidence, which at present is very limited, this study aimed to characterize the pulling forces needed when using a school trolley bag, on a route that includes level and inclined ground surface, steps, and stairs. A sample of 195 students of primary school (age 8-11) participated, and they were asked to pull an instrumented trolley loaded with school items (total load = 62 N) from the school entrance to a classroom located one floor up in the school building. The results, expressed in terms of “pulling force vs. time” curves, show that particularly during stairs ascent and descent, one arm may exert quite large dynamic forces, and that these forces can be up to twice the mass of the carried load. Although exposure to such loads is quite limited, the methodology described here highlights the potential for concern and provides a basis for future investigations of the contribution of trolley bag carriage and disorders of the arm-shoulder complex among children
Analisi del flusso a valle di una schiera statorica di turbina a gas operante ad alti numeri di Mach
No full textSeawater desalination powered by renewable energy sources for sustainable fresh water supply construction of a partaken process in a marine protected area
No full textMeasurements and numerical simulations in a gas turbine cascade with cutback blade trailing edge
No full textSeawater desalination powered by renewable energy sources for sustainable fresh water supply construction of a partaken process in a marine protected area
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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