7 research outputs found
Filtre microonde sélectif utilisant un résonateur à un seul organe de couplage. Application à la réalisation d'auto-oscillateurs pour réfractométrie et spectrométrie hertzienne
Nous dĂ©crivons un montage original permettant de donner Ă un rĂ©sonateur microonde Ă un seul organe de couplage un comportement analogue Ă celui d'un filtre sĂ©lectif fonctionnant en transmission. Ce montage, placĂ© entre l'entrĂ©e et la sortie d'un tube Ă onde progressive, permet de rĂ©aliser un auto-oscillateur de frĂ©quence asservie Ă celle de la cavitĂ©. Ce montage peut ĂȘtre utilisĂ© en rĂ©fractomĂ©trie et en spectromĂ©trie Ultra-Hertzienne
Filtre microonde sélectif utilisant un résonateur à un seul organe de couplage. Application à la réalisation d'auto-oscillateurs pour réfractométrie et spectrométrie hertzienne
An original device, analogous to a transmission selectif filter, with only one coupling microwave resonator, is described. This apparatus, when included between two ends of a T. W. T., gives rise to a feedback oscillator ; applications may be found in refractometry and U. H. F. spectrometry.Nous dĂ©crivons un montage original permettant de donner Ă un rĂ©sonateur microonde Ă un seul organe de couplage un comportement analogue Ă celui d'un filtre sĂ©lectif fonctionnant en transmission. Ce montage, placĂ© entre l'entrĂ©e et la sortie d'un tube Ă onde progressive, permet de rĂ©aliser un auto-oscillateur de frĂ©quence asservie Ă celle de la cavitĂ©. Ce montage peut ĂȘtre utilisĂ© en rĂ©fractomĂ©trie et en spectromĂ©trie Ultra-Hertzienne
Comparison of the Tumoral Biodistribution of P792, a Rapid Clearance Blood Pool Agent and Gd-DOTA in a C6 Glioma Cerebral Tumor Model in Rats
PTR-TOF-MS and data-mining methods for rapid characterisation of agro-industrial samples: influence of milk storage conditions on the volatile compounds profile of Trentingrana cheese
Proton transfer reaction-mass spectrometry (PTR-MS), a direct injection mass spectrometric technique based on an efficient implementation of chemical ionisation, allows for fast and high-sensitivity monitoring of volatile organic compounds (VOCs). The first implementations of PTR-MS, based on quadrupole mass analyzers (PTR-Quad-MS), provided only the nominal mass of the ions measured and thus little chemical information. To partially overcome these limitations and improve the analytical capability of this technique, the coupling of proton transfer reaction ionisation with a time-of-flight mass analyser has been recently realised and commercialised (PTR-TOF-MS). Here we discuss the very first application of this new instrument to agroindustrial problems and dairy science in particular. As a case study, we show here that the rapid PTR-TOF-MS fingerprinting coupled with data-miningmethods can quickly verify whether the storage condition of themilk affects the final quality of cheese and we provide relevant examples of better compound identification in comparison with the previous PTR-MS implementations. In particular, âTrentingranaâ cheese produced by four different procedures for milk storage are compared both in the case of winter and summer production. It is indeed possible to set classification models with low prediction errors and to identify the chemical formula of the ion peaks used for classification, providing evidence of the role that this novel spectrometric technique can play for fundamental and applied agro-industrial themes.Fil: Fabris, Alessandra. Instituto Agrario San Michele All'adige Fondazione Edmund Mach; ItaliaFil: Biasioli, Franco. Instituto Agrario San Michele All'adige Fondazione Edmund Mach; ItaliaFil: Granitto, Pablo Miguel. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Rosario. Centro Internacional Franco Argentino de Ciencias de la InformaciĂłn y Sistemas; Argentina. Universidad Nacional de Rosario; ArgentinaFil: Aprea, Eugenio. Instituto Agrario San Michele All'adige Fondazione Edmund Mach; ItaliaFil: Cappellin, Luca. Instituto Agrario San Michele All'adige Fondazione Edmund Mach; Italia. Universidad de Innsbruck; AustriaFil: Schuhfried, Erna. Universidad de Innsbruck; AustriaFil: Soukoulis, Christos. Instituto Agrario San Michele All'adige Fondazione Edmund Mach; ItaliaFil: MĂ€rk, Tilmann D.. Universidad de Innsbruck; AustriaFil: Gasperi, Flavia. Instituto Agrario San Michele All'adige Fondazione Edmund Mach; ItaliaFil: Endrizzi, Isabella. Instituto Agrario San Michele All'adige Fondazione Edmund Mach; Itali