36,788 research outputs found
Intervista a Lorenzo Bianconi
No full textIn dialogo con Massimo Gentili-Tedeschi (Milano), successore di Claudio Sartori alla testa dell'Ufficio Ricerca Fondi Musicali (c/o Biblioteca nazionale Braidense e Conservatorio di musica 'G. Verdi' di Milano), ampio ricordo della personalità dell'insigne bibliografo e storico della musica, e dei contatti avuti con lui nell'ambito della ricerca per il Répertoire International des Sources Musicales (RISM) negli anni '60-'70
G polymorphism
No full textHuman leukocyte antigen (HLA)-G is a non classical HLA class I antigen with immuno-modulatory functions. The HLA-G gene is characterized by a +3142C>G variant in the 3′ untranslated region which is suggested to control protein production and to be associated with pathological conditions. DNAs form 221 randomly selected healthy subjects were genotyped for HLA-G +3142C>G polymorphism by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) (BaeGI), real-time PCR and sequencing. The 19% of the PCR-RFLP heterozygous samples were genotyped as 3142GG by real-time PCR and sequencing. This disagreement is caused by digestion efficiency in PCR-RFLP. This real-time PCR method will guarantee an accurate genotyping for future research and clinical purposes, where large cohorts should be tested. © 2012 John Wiley & Sons A/S
Wideband equivalent-circuit model analysis, realization and time-domain spectroscopy characterization of terahertz periodic metamaterial devices
No full textIn my PhD thesis, I have thoroughly researched THz periodic metamaterial devices by dealing with all the phases of their development: electromagnetic analysis, design, fabrication, characterization, and data post-processing. Initially, for the analysis and design phases, I have adopted an analytical/numerical perspective for the retrieval of the devised circuit topologies. In particular, I have developed and applied equivalent circuit models and parametric macromodels for the physical investigation and optimization of the devices; these methods have been validated by proving their efficiency and effectiveness through the comparison with finite-element method based simulations. Also, they guarantee a wider range of applications in terms of frequency spectra, complexity of geometrical shapes, and material characteristics. For the realization phase, I have used a heuristic procedure of micro-fabrication and after evaluating possible non-idealities, I have made tolerance studies in order to obtain a stable electromagnetic performance. For the characterization of the flexible devices, I have used custom THz-TDS setups for both reflection and transmission-modes; the resulting configurations have proved to be compact and interesting also for further integration in embedded measurement systems. For the data analysis phase, I have post-processed the acquired measurements by implementing retrieval procedures of the constitutive parameters of the samples. Other than topics specifically related to the THz field, I have developed some models of analytical/numerical character for the study of scatterers with discontinuous impedance boundary conditions
Stopband singlet: A novel structure implementing resonating couplings
No full textIn this letter a new type of singlet is introduced, called stopband singlet. The new singlet is implemented in rectangular waveguide, exploiting TE301 as resonating mode and TE10 mode as nonresonating bypass coupling. Unlike the previously introduced singlets [which produce one transmission zero (TZ) and one reflection zero (RZ)], the stopband singlet generates one TZ alone (the RZ is pushed to infinity). The novel structure allows designing filters with resonating couplings introducing TZs very close to the passband (difficult to implement with other resonating waveguide discontinuities). A prototype two-pole filter with one TZ has been designed and fabricated to validate experimentally the novel singlet configuration
Wideband analysis of lossless multimode waveguide junctions
No full textThis paper presents the application of a method for the wideband analysis of lossless arbitrary waveguide junctions. The analysis is based on a compact model obtained by the frequency response at the terminals only. The model makes use of the Generalized Scattering Matrix (GSM) and its frequency derivative and is capable to deal with large number of modes (also below cutoff) with a small number of frequency samples
A parabolic approach to the Calabi–Yau problem in HKT geometry
No full textWe consider the natural generalization of the parabolic Monge–Ampère equation to HKT geometry. We prove that in the compact case the equation has always a short-time solution and when the hypercomplex structure is locally flat and admits a compatible hyperkähler metric, then the equation has a long-time solution whose normalization converges to a solution of the quaternionic Monge–Ampère equation first introduced in Alekser and Verbitsky (Isr J Math 176:109–138, 2010). The result gives an alternative proof of a theorem of Alesker (Adv Math 241:192–219, 2013)
Analysis of dual-slot coupling for satellite filters
No full textA novel mode-matching method for analysing multiple-slot couplings and simultaneous couplings on different walls of a rectangular cavity is presented. The method makes use of a six-port junction in rectangular waveguide allowing the access to a rectangular cavity from every direction. The addition of short circuits on all unused ports and of reducing/bifurcating discontinuities enables the shaping of coupling apertures as required. The analysis of a two-pole filter with a dual-slot central coupling confirms the accuracy of the proposed approach
- …
