Doppler indication

Fig. 1.52. Intussusception. Duplex Doppler sonography. Color Doppler indicates wall vascularity. High resistive index is observed in the vessels within the intussusception. This intussusception could be reduced...

Fig. 2.6 Schematic illustration of a Mossbauer transmission experiment in five steps. The Absorption bars indicate the strength of recoilless nuclear resonant absorption as determined by the overlap of emission and absorption lines when the emission line is shifted by Doppler modulation (velocities Uj,. .., 1)5). The transmission spectrum T v) is usually normalized to the transmission T oo) observed for v oo by dividing T(v)IT(oo). Experimental details are found in Chap. 3...

Echo-Doppler of carotid artery As indicated by clinical features... 

D3) absorption and emission lines (from n = 3 states) in H2 (D2) plasmas were strongly Doppler-broadened which seems to indicate high, nonthermal energies (about 0.3 eV) of the absorbing or emitting H3 molecules. The energy is close to that expected if the excited (n = 3) H3 molecules were formed by recombination of Hj, but in Amano s work no Hj ions should have been present. Perhaps, the fast H3 molecules are produced from H + H2 collisions, and the spectroscopic observations provide indirect evidence for the existence of H3 molecules. The conjecture needs to be examined by more detailed work. 

Since the energy of a photon is hv = 3.3 x 10 J, the average number of photons for that mode is 1.7 x 10. This indicates that the number of photons per mode in the visible region for a spectral width of 10 s (in the order of the Doppler width) is a very small nnmber compared to unity. This has important conseqnences, as we will see in Section 2.3. 

Fig. 5. Doppler blood flow of tumors on the indicated day after treatment with 6 Gy. Restoration of blood occurs in all tumors except those treated with Flk-1 antagonist SU5416 twice weekly for 2 wk (SU).

The above calculations, indicating proportionality between Ar and D, are not applicable when Ar is very much greater than Tn (the natural linewidth) (49). In the latter case, the diffusivity is so large as to impart a net velocity to the nucleus during the mean lifetime of the excited state, and Doppler... 

Ra reaction at 5.3 MeV/u, with RDM Doppler shift techniques, is now in progress as a Yale-GSI-Munich collaboration. Preliminary results indicate enhanced B(E1) 6 x 10 W.u. in... 

FIGURE 2.1 Energy levels, isomer shift, and quadrupole splitting for 57Fe. The Mossbauer spectrum shown was recorded at T— 4.2 K with a sodium nitroprusside absorber, a diamagnetic (.S 0) compound often used for velocity calibrations. The isomer shift, indicated by the vertical dashed line, has the value 5 — —0.18 mm/s relative to Fe metal. 1 mm/s Doppler shift... 

FIGURE 2.21 Mossbauer spectra of whole M. capsulatus (Bath) cells recorded at 4.2K. The features of the diiron(III) center (20% of total Fe) are indicated by the solid lines. The magnetic component, with absorption stretching from —8 to +8mm/s Doppler velocity has been assigned to ferric nanoparticles (NP). 

Figure 3-9. Sub-Doppler resolution OH LIF spectra indicate a modest amount of c.m. translational energy for all of the OH levels monitored in the reaction H + N20 -> OH + N2 see Bohmer et al. (1992) for details. A Franck-Condon projection of the 1,3-hydrogen shift transition state N-N separation of 1.23 A (solid line, lower part) predicts a high degree of N2 vibrational excitation (upper part) and yields good agreement with the data (shaded circles, lower part).

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