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Risonatore cilindrico a microonde
Full text linkThe present invention relates in general to microwave resonators, in particular for the manufacture of oscillators. More specifically the invention relates to a cylindrical resonator, of the type comprising: a cylindrical tubular member made of metal material, and closure means likewise made of metal material and associated with the tubular member so as to define in the inside thereof a cylindrical cavity resonating at a predetermined frequency; and in which said closure means have a thermal elongation coefficient different from that of the tubular member so as to reduce the variation in the resonance frequency of the cavity upon variation of the temperature, including not only the linear variation term but also the nonlinear ter
Struttura tubolare con diametro interno termicamente stabilizzato, in particolare per un risonatore a microonde
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Frequency domain method and device to measure series resistance and figure of merit of thermoelectric devices
No full textSolutions and ultimate limits in temperature compensation of metallic cylindrical microwave resonators
No full textIn trying to implement temperature compensation of high-Q metallic microwave cavities with the two-metal technique, crippling problems arise from the exceedingly high uncertainty with which the Coefficients of Thermal Expansion (CTE) of the two metals are known, and from their non linearity with temperature. A novel approach is here proposed, following which both problems can be separately addressed, opening the way for improvement of the resonance frequency temp-co into the 10^-10/K and possibly the 10^-11/K regio
'Stachanovista' e 'pasticheur' della pittura fiorentina: lo 'Pseudo Pier Francesco Fiorentino'
No full textVittorio Cini collezionista di pittura: una splendida avventura, dal Castello di Monselice alla dimora veneziana, da Nino Barbantini a Federico Zeri
No full textIl saggio ricostruisce gli straordinari acquisti di pittura compiuti da Vittorio Cini mettendo in luce il ruolo di alcuni fra i suoi più importanti consulenti da Bernard Berenson a Federico Zer
Spatial variations of field polarization and phase in microwave cavities: application to the cesium fountain cavity
No full textAssessment of root failures in tube-to-flange steel welded joints under torsional loading according to the Peak Stress Method
No full textIn the context of the local approaches to fatigue design of welded joints, the notch stress intensity factor
(NSIF) approach assumes the weld toe as well as the weld root profile as sharp V-shaped notches, the
V-notch opening angle being greater than zero at the toe side and equal to zero at the root side. The
Peak Stress Method (PSM) is an engineering, finite element (FE)-oriented method to rapidly estimate
the NSIF local stress parameters by means of linear elastic FE analyses with coarse meshes. By using
the averaged Strain Energy Density (SED, which can be expressed as a function of the relevant NSIFs)
as a fatigue strength criterion, a so-called equivalent peak stress can be defined and adopted to assess
either weld toe and weld root fatigue failures in conjunction with an existing design fatigue curve, that
was originally calibrated on experimental results relevant only to weld toe failures. In the present paper
new fatigue test results relevant to weld root failures have been generated by testing tube-to-flange
fillet-welded steel joints under torsional loading. Good agreement has been obtained between theoretical
estimations according to the PSM and experimental fatigue test results
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