1,853 research outputs found
Further Improvements in Real-Time Load-Pull Measurement Accuracy
This letter proposes a new solution to improve the accuracy
of real-time load-pull measurement systems. Since it is well
known that load-pull measurement accuracy depends on the calibration
residual uncertainty, the presented solution uses a new
algorithm to reduce it. Measurement results that corroborate the
proposed solution, with respect to the previous one, show the improvements
that have been achieved
Metal–Organic Frameworks in Italy: From synthesis and advanced characterization to theoretical modeling and applications
Limits on X-Ray Polarization at the Core of Centaurus A as Observed with the Imaging X-Ray Polarimetry Explorer
Adsorption Properties of Ce5(BDC)7.5(DMF)4 MOF
In this article we report on the spectroscopic and adsorptive studies done on Ce(III)-based MOF possessing, upon desolvation, open metal sites, and a discrete surface area. The Ce-based MOF was synthesized from terephthalic acid linker (H2BDC) and Ce3+ cations by the classical solvothermal method. Preliminary powder X-ray diffraction analysis showed that the obtained materials corresponded to the ones reported by other authors. Spectroscopic techniques, such as XAS and in situ FTIR with probe molecules were used. In situ FTIR spectroscopy confirmed the successful removal of DMF molecules within the pore system at temperatures above 250 \ub0C. Moreover, the use of CO as a probe molecule evidenced the presence of a Ce3+ open metal sites. Detailed volumetric and calorimetric CO2 adsorption studies are also reported
On the solar origin of the 200 y Suess wiggles: Evidence from thermoluminescence in sea sediments
In order to understand the origin of the Suess wiggles, present in the tree ring 14C record, we have studied the thermoluminescence (TL) of a shallow-water Ionian sea core, in an attempt to provide a record of an indicator
responding to the solar output more promptly than 14C in tree rings. The spectral content of the TL and radiocarbon records is very similar; neverthless, in addition to the 207 y Suess wave (A43.6% ), the TL record shows the second harmonic (103.5 y; A42.4% ), in phase with the envelope of the 11 y solar cycles. This result, obtained by different spectral methods, in particular by Superposition of Epochs (SE) and by Singular Spectrum Analysis (SSA), strongly supports the solar origin of the 200 y Suess wiggles
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