207,975 research outputs found
Funzioni del saggio postcoloniale di lingua inglese
No full textSi analizza la saggistica prodotta dai maggiori romanzieri postcoloniali, da Rushdie (di cui si esaminano i saggi contenuti in "Imaginary Homelands" e "Step Across This Line") a Margaret Atwood ("Negotiating with the Dead"), da J. M. Coetzee ("Stranger Shores") a Ben Okri ("A Way of Being Free"), alla luce della speculazione di Edward Said, e del suo "testamento spirituale", il saggio postumo "Humanism and Democratic Criticism".
Si tratta del primo saggio apparso nella nostra lingua sulla saggistica postcoloniale e, in particolare, sulla produzione non fiction di alcuni tra i maggiori scrittori postcoloniali di lingua inglese
Piezoresistive semi-transparent flexible sensors by bithiophene fulleropyrrolidine thin films
No full textPiezoresistive sensors are considered among the fundamental components of the future wearable electronic devices, given their potential applications in artificial skin, motion capture and personalized medicine.[1-5] Here, we present a cost-effective, viable fabrication approach to realize piezoresistive sensors using a novel polymeric biotiophene fulleropyrrolidine system (bis-C60Bi) synthesized on flexible ITO/PET supports by electrochemical chronoamperometry. By applying an anodic potential (1.5 V) to a solution containing the monomer, it is possible to obtain a homogeneous semi-transparent thin film on the ITO/PET surface (see Figure). AFM,
XPS, UV-vis have been employed to characterize the morphology and chemical composition of the new synthesized polymeric thin films, confirming the chemical structure and showing a nanoscale surface roughness of about 25 nm. The resulting polymer-based device shows good resistance variation on bending in the semi-static regime, outperforming current ITO/PET resistive sensors [6] and well matching commercial devices based on opaque amorphous carbon materials.[7] The durability of the sensor has been validated over almost one hundred cycles. This new class of polymeric piezoresistive sensors may open new applications in the field of kinematic acquisition or of sensor monitoring, with several potential applications as well as in medicine, robotics and physiotherapy.
Bibliography
1 M. Ricci, G. Di Lazzaro, A. Pisani, N. B. Mercuri, F. Giannini, G. Saggio, IEEE Journal of Biomedical and Health Informatics, 2019,
doi: 10.1109/JBHI.2019.2903627
2 G. Arrabito, V. Errico, Z. Zhang, W. Han, C. Falconi, Nano Energy, 2018, 46, 54. doi: 10.1016/j.nanoen.2018.01.029
3 G. Saggio, G. Orengo, A. Pallotti, V. Errico, M. Ricci, IEEE International Symposium on Medical Measurements and Applications
(MeMeA), 2018, doi: 10.1109/MeMeA.2018.8438767
4 N. Jasoon, M.D. Ho, W. Cheng, J. Mater. Chem. C, 2017, 5, 5845.
5 G. Saggio ; G. Orengo ; A. Pallotti ; V. Errico ; M. Ricci, International Symposium on Networks, Computers and Communications
(ISNCC) 2018 doi: 10.1109/ISNCC.2018.8531054
6 T. Lee, Y. W. Choi, G. Lee, P. V. Pikhita, D. Kang, S.M. Kim and M. Choi, J. Mater. Chem. C, 2016, 4, 9947.
7 G. Saggio, G. Orengo, Sensors and Actuators A, 2018, 273, 221
Saggio sull'esperienza della morte
No full textTRADUZIONE ED EDIZIONE CRITICA DEL SAGGIO DI LANDSBERG NELLE SUE DIVERSE E SUCCESSIVE EDIZIONI IN TEDESCO, SPAGNOLO (CASTIGLIANO) E FRANCES
Feasibility of teleoperations with multi-fingered robotic hand for safe extravehicular manipulations
No full textExtra-Vehicular Activity (EVA) plays such a key role that more and more time is devoted to it in space missions. Nevertheless, EVA presents so many intrinsic critical aspects to result highly hazardous for the human operators. This is why a convenient alternative can be offered by telerobotic manipulations, with multi-fingered robotic hands working in teleoperated mode, to safely and remotely replicate the capabilities of the operator's hands. But at present, remotely controlled robotic hands cannot provide the same dexterity of humans, so this work is intended to experimentally evaluate their feasibility and technological limits when operator's hand gestures are one-to-one mapped directly to a robotic hand device. In particular we demonstrated how state-of-the art sensory gloves, used to measure angles of human finger's joints, can introduce averaged errors of 4.6 degrees in angles, and that these errors increase to 6.5 degrees when remotely replicated by standard anthropomorphic robotic hands
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