The frequency shift of spectral lines from astronomical objects is most often explained by the Doppler Effect arising in relative motion and the broadening of a particular line is supposed to depend on the absolute temperature , pressure or the different line of sight velocities.. The Wolf effect on the other hand deals with correlation induced spectral changes and explains both the broadening ...

We present an isothermal chamber designed and realized at the Italian Metrological Institute (INRiM) to stabilize temperature of a quartz cell for Doppler-broadened precision spectroscopy mercury atoms in UV region practical realization new definition kelvin. The challenge this apparatus is capability control, with great accuracy, non-cylindrical cavity containing vapors. was actively controlle...

Coincidence Doppler Broadening (CDB) Positron Annihilation Spectroscopy (PAS) is a material analysis technique that can be used to non-destructively measure characteristics of structural defects in samples. Analyzing and comparing large datasets obtained using this technique, however, complicated time intensive. The Analysis Program (CDB-AP) graphical user interface facilitates rapid many data ...

OBJECTIVE To compare the value of echo score with that of Doppler subvalvar flow broadening in deciding the type of mitral stenosis surgery. PATIENTS 30 patients, mean age 47 years, with severe stenosis undergoing surgery were divided into two groups according to type of surgery: open heart commissurotomy (group 1, n = 12), or prosthesis (group 2, n = 18). A control group of 10 patients with ...

Twenty normal subjects and 82 patients with valvular heart disease, whose lesions were independently assessed either by cardiac catheterisation and/or at operation, were studied using the pulsed Doppler technique combined with either one or two dimensional echocardiography. Of these, 41 patients had tricuspid lesions, including 40 with regurgitation and nine with stenosis. The tricuspid analogu...