Two-photon LIF on the HIT-SI3 experiment: Absolute density and temperature measurements of deuterium neutrals.

Two-photon laser-induced fluorescence measurements were performed on the helicity injected torus (HIT-SI3) device to determine the density and temperature of the background neutral deuterium population. Measurements were taken in 2 ms long pulsed plasmas after the inductive helicity injectors were turned off. Attempts to measure neutrals during the main phase of the plasma were unsuccessful, likely due to the density of neutrals being below the detection threshold of the diagnostic.

High frequency tympanometry findings in neonates: does it depend on head position?

Objective: The purpose of this study was to investigate the effect of head positions on high frequency tympanometry (HFT) results obtained from neonates.

Design: A cross-sectional study to compare HFT results obtained from neonates in two head positions (face sideways and face up).

Study Sample: One hundred and fifty-seven neonates (80 female, 77 male; mean age = 48.