25 research outputs found
Full-scale vibration testing of nozzle guide vanes
No full textAn increasing number of turboexpanders are equipped with Nozzle Guide Vane (NGV) as the first stator stage. By varying the throat area of the first stator vane the NGV enables an additional control methodology to the line-up power output allowing higher operational flexibility and higher efficiency at partial load and partial speed. The design of this component might become critical for enabling high expander availability considering its exposure to high temperature, thermal loading, and fluid induced vibrations. This is especially true also considering that the vibration frequencies of this sub-assembly are influenced by internal clearances and by the value of the friction coefficient, which leaves a relevant margin of error when using numerical methods (such as FEM) for predicting the actual structural behavior of this component. In this paper, the design of a full-scale test bench for the determination of both friction coefficients and modal behavior of a nozzle guide vane geometry is described. The bench enables us to simulate the pre-load due to aerodynamic forces on the NGV airfoil simulating the actual working conditions of bushes and bearings
Robotic versus laparoscopic right colectomy with intracorporeal anastomosis: a multicenter comparative analysis on short-term outcomes
No full textIn literature, most of the comparative studies of robotic (RRC) versus laparoscopic (LRC) right colectomy are biased by the type of the anastomotic technique adopted. With this study, we aim to understand whether there is a role for robotics in performing right colectomies, comparing RRC versus LRC, both performed with intracorporeal anastomosis
Correction to: Laparoscopic right hemicolectomy: the SICE (Società Italiana di Chirurgia Endoscopica e Nuove Tecnologie) network prospectivetrial on 1225 cases comparing intra corporeal versus extra corporeal ileo‐colic side‐to‐side anastomosis (Surgical Endoscopy, (2019), 10.1007/s00464-019-07255-2)
No full textDue to an error in production the members of SICE CoDIG (Colon Dx Italian Group) listed in the Acknowledgments were not tagged correctly as authors in the XML of this article. This listing is presented again here: SICE CoDIG (ColonDxItalianGroup): V. Adamo (S Lazzaro Alba – CN), A. Agrusa (Palermo), G. Alemanno (Firenze), M.E. Allaix (Torino), A. Alò (Orbassano TO), A. Altamura (Tricase – LE), A. Ambrosi (Foggia), M. Antoniutti (Bassano del Grappa – VI), D. Apa (Roma), G. Arcuri (Gubbio – PG), G.L Baiocchi (Brescia), A. Balani (Gorizia), G. Baldazzi (Milano), M. Basti (Pescara), C. Benvenuto (Protogruaro – VE), S. Berti (La Spezia), L. Boni (Milano), F. Borghi (Cuneo), E. Botteri (Brescia), R. Brachet Contul (Aosta), A. Brescia (Roma), A. Budassi (Frabriano - AN), L. Cafagna (Andria), M. Calgaro (S Lazzaro Alba – CN), P.G. Calò (Cagliari), R. Campagnacci (Jesi – AN), G. Canova (Borgosesia – VC), G.L. Canu (Cagliari), V. Caracino (Pescara), P. Carcoforo (Ferrara), M. Carlini (Roma), L. Casali (Fidenza – PR), D. Cassetti (Siena), E. Cassinotti (Milano), M. Catarci (Ascoli Piceno), M. Cesari (Città di Castello – PG), P. Checcacci (Firenze), P. Ciano (Ascoli Piceno), M. Clementi (L’ Aquila), G. Cocorullo (Palermo), F. Colombo (Milano), G. Concone (Milano), A. Contine (Città di Castello – PG), M. Coppola (Lanusei – NU), A. Coratti (Firenze), F. Corcione (Napoli), P. Corleone (Trieste), L. Covotta (Contrada Pozzillo – AV), D. Cuccurullo (Napoli), P. Cumbo (Chieri – TO), G. D’Ambrosio (Roma), F. De Angelis (Latina), M. De Luca (Montebelluna –TV), N. De Manzini (Trieste), C. De Nisco (Nuoro), G.D. De Palma (Napoli), P. De Paolis (Torino), M. Degiuli (Orbassano – TO), D. Delogu (Lanusei – NU), P. Delrio (Napoli), A. Deserra (Cagliari), A. Donini (Perugia), U. Elmore (Milano), G. Ercolani (Forlì), E. Erdas (Cagliari), L. Fabris (Cles – TN), G. Ferrari (Milano), C. Feo (Valle Oppio – FE), F. Fidanza (Portogruaro – VE), D. Foschi (Milano),R. Galleano (Pietra Ligure – SV), G. Garulli (Rimini), F. Gatti (Milano), A. Gattolin (Mondovì – CN), S. Gelati (Conegliano Veneto – TV), R. Gelmini (Modena), O. Ghazouani (Pietra Ligure – SV), A. Gioffrè (Roma), S. Gobbi (Olbia), V. Grammatico (Chieri – TO), A. Guariniello (Ravenna), S. Giannessi (Pistoia), M. Guerrieri (Ancona), L. Guerriero (Napoli), G. Gullotta (Palermo), H. Impellizzeri (Peschiera del Garda – VR), M. Izzo (Firenze), E. Jovine (Bologna), G. Lezoche (Ancona), C. Lirusso (Udine), R. Lombardi (Bologna), M. Longoni (Milano), A. Lucchi (Riccione – RN), A.P. Luzzi (Genova), P. Marini (Roma), A.G. Marrosu (Sassari), A. Martino (Udine), R. Mazza (Perugia), S. Mazzoccato (Jesi – AN), F. Medas (Cagliari), A. Meloni (San Gavino Monreale – VS), M. Milone (Napoli), E. Minciotti (Gubbio – PG), F. Monari (Riccione – RN), G. Moretto (Peschiera del Garda – VR), I.A. Muttillo (Roma), G. Navarra (Messina), S. Neri (Sassuolo - MO), A. Oldani (Zingonia – BG), S. Olmi (Zingonia – BG), E. Opocher (Milano), E. Osenda (Trieste), R. Ottonello (Muravera – CA), V. Panebianco (Taormina - CT), M. Pavanello (Conegliano Veneto – TV), F. Pecchini (Modena), L. Pellegrino (Cuneo), D. Pennisi (Gorizia), N. Perrotta (Potenza), D. Pertile (Genova), R. Petri (Udine), A. Picchetto (Roma), M. Piccoli (Modena), B. Pirrera (Rimini), A. Pisani Ceretti (Milano), M. Pisano (Muravera – CA), M. Podda (Nuoro), N. Portolani (Brescia), L. Presenti (Olbia), A. Puzziello (Salerno), S. Razzi (Aosta), D. Rega (Napoli), E. Restini (Bari), G. Ricci (Roma), M. Rigamonti (Cles – TN), U. Rivolta (Magenta), V. Robustelli (Pistoia), E. Romairone (Genova), R. Rosati (Milano), E. Rosso (Brescia), F. Roviello (Siena), S. Sala (Sassuolo – MO), M. Santarelli (Torino), G. Sarro (Magenta), A. Sartori (Montebelluna –TV), S. Scabini (Genova), F. Scognamillo (Sassari), R. Sechi (San Gavino Monreale – VS), L. Solaini (Forlì), G. Soliani (Ferrara), P. Soliani (Ravenna), E. Soligo (Vercelli), M. Sorrentino (Latisana – UD); G. Spinoglio (Milano), E. Stratta (Genova), A. Taddei (Firenze), G. Talamo (La Spezia), S. Targa (Valle Oppio – FE), N. Tartaglia (Foggia), S. Testa (Vercelli), P. Ubiali (Pordenone), A. Valeri (Firenze), F. Vasta (Taormina - CT), A. Verzelli (Fabriano – AN), R. Vicentini (L’Aquila), G. Viola (Tricase – LE), V. Violi (Fidenza - PR), M. Zago (Borgosesia – VC), L. Zampino (Milano)
Total Electron Content Measurements at Gauhati Using 140 MHz ATS-6 Transmissions
No full text241-244The amplitude and phase of 140 MHz transmissions from geostationary satellite ATS-6 (0oN, 35°E) have been recorded at Gauhati (26·15°N; 91·75°E) for the period Nov. 1975 to Aug. 1976. The calibration technique for geostationary satellite Faraday rotation measurements suggested by Checcacci and Giorgeo [Checcacci, P. F. & Giorgeo, M, T., J. almos.terr. Phys. 37 (1976),119] has been improved and generalized, It is then utilized to remove the nπ ambiguity in Faraday rotation values and also to estimate the correct value of diurnal minimum Faraday rotation angle so that the recorded Faraday rotation values can be converted into electron content values. Typical diurnal variation curves have been obtained for all the months except for equinoxes when the satellite transmission was off very often due to ecliptic conditions and hence no complete diurnal curves could be obtained for these months, It has been found that though December and January behave like typical winter months, the month of November is more like an equinoctial month. Similarly, though June and July behave like typical summer months the month of May is more or less similar to equinoxes. The characteristic features of the diurnal and seasonal behaviour of the electron content have been discussed
Space‐variant transfer functions for the characterization of inhomogeneous scattering media
No full text
Root Zone Sensors for Irrigation Management in Intensive Agriculture
No full textCrop irrigation uses more than 70% of the world’s water, and thus, improving irrigation efficiency is decisive to sustain the food demand from a fast-growing world population. This objective may be accomplished by cultivating more water-efficient crop species and/or through the application of efficient irrigation systems, which includes the implementation of a suitable method for precise scheduling. At the farm level, irrigation is generally scheduled based on the grower’s experience or on the determination of soil water balance (weather-based method). An alternative approach entails the measurement of soil water status. Expensive and sophisticated root zone sensors (RZS), such as neutron probes, are available for the use of soil and plant scientists, while cheap and practical devices are needed for irrigation management in commercial crops. The paper illustrates the main features of RZS’ (for both soil moisture and salinity) marketed for the irrigation industry and discusses how such sensors may be integrated in a wireless network for computer-controlled irrigation and used for innovative irrigation strategies, such as deficit or dual-water irrigation. The paper also consider the main results of recent or current research works conducted by the authors in Tuscany (Italy) on the irrigation management of container-grown ornamental plants, which is an important agricultural sector in Italy
