[show abstract][hide abstract] ABSTRACT: In this work, super-critical cohesion parameters for Soave-Redlich-Kwong (SRK) equation of state (EOS) were adjusted by fitting cohesion parameters to the reliable Joule-Thomson Inversion Curve (JTIC) data. For this purpose, the reliable JTIC data for CH4 and CO2 was adapted from literature. To evaluate the results, the modified SRK EOS was compared to the EOSs including square-well (SW) EOS, four-parameter Trebble-Bishnoi (TB) EOS and Peng-Robinson (PR) EOS. Moreover, The JTICs obtained from the new EOS for nine substances Ar, Ne, N2, O2, C2H4, C2H6, CO2, CH4 and CO indicated its abilities to present good predictions, while the SRK EOS produced the results underpredicted at high-temperature regions. In addition, a detailed analysis of the ideal curves including JTIC, compressibility factor curve, Boyle curve and Zeno line which are calculated by the new EOS has been carried out.
[show abstract][hide abstract] ABSTRACT: We present a dual-mode resonator operating at/near 94 GHz (W-band) microwave frequencies and supporting two microwave modes with the same field polarization at the sample position. Numerical analysis shows that the frequencies of both modes as well as their frequency separation can be tuned in a broad range up to GHz. The resonator was constructed to perform pulsed ELDOR experiments with a variable separation of "pump" and "detection" frequencies up to Δν=350 MHz. To examine its performance, test ESE/PELDOR experiments were performed on a representative biradical system.
Journal of Magnetic Resonance 01/2011; 209(2):341-6. · 2.30 Impact Factor
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