An asymptomatic 33 year-old Caucasian male presented for routine imaging following a St. Jude's bi-leaflet aortic valve replacement some 6 months previously. The images show high-intensity transient signals (HITS) just below the aortic valve in both par-asternal and apical long axis views. The valve replacement otherwise appeared healthy. HITS are thought to be microbubbles which occur due to c...

To produce extreme ultraviolet radiation via high harmonic generation (HHG) in rare gases, light intensities in excess of 1014 W/cm 2 are required. Usually such high intensity are obtained by parametric amplification of laser pulses, which in turn reduces the pulse repetition rate to a few kHz. Given that the HHG process is inherently inefficient, with conversion ratios less than 10-5, only a s...

Intensity fluctuations were measured during August 2002 near San Diego using 20 and 40 kHz cw and fm signals. Source-receiver separation was 1km; source depths were 10m to 67m; receiver hydrophone depths were 44m to 217m. A 15-element chain of CTD sensors was towed to measure horizontal temperature and salinity with 1m resolution. Comparing the spectra of the acoustic intensity fluctuations and...

CONTEXT A higher duration and intensity of exercise may improve long-term weight loss. OBJECTIVE To compare the effects of different durations and intensities of exercise on 12-month weight loss and cardiorespiratory fitness. DESIGN, SETTING, AND PARTICIPANTS Randomized trial conducted from January 2000 through December 2001 involving 201 sedentary women (mean [SD] age, 37.0 [5.7] years; me...

Experiment and numerical simulations have shown that the heating of atomic clusters can be enhanced by using a correctly timed sequence of two high-intensity pulses of different frequencies. We have measured ion energies from Xe clusters irradiated with two high-intensity femtosecond laser pulses, one at the laser fundamental frequency ~780 nm! and one at its second harmonic ~390 nm!, focused t...