Zobrazeno 1 - 10
of 94
pro vyhledávání: '"Humphrey, J. A."'
Publikováno v:
Journal of Low Temperature Physics. 201:114-121
We report on studies of positive ions in superfluid helium-4. In addition to the positive ion that has been previously studied, we have been able to detect two more positive ions with slightly different mobility, and the results show some evidence fo
Publikováno v:
Journal of Low Temperature Physics. 192:48-64
We report on experiments in which we study cavitation resulting from electrons in liquid helium. Electrons are introduced into the liquid by a radioactive source. After an electron comes to rest in the liquid, it forces open a small cavity referred t
Publikováno v:
Journal of Low Temperature Physics. 189:53-59
We report on experiments in which focused laser light is used to induce optical breakdown in liquid helium-4. The threshold intensity has been measured over the temperature range from 1.1 to 2.8 K with light of wavelength 1064 nm. In addition to the
Autor:
Emil Joseph, A. Pal, Vaisakh Vadakkumbatt, Humphrey J. Maris, Ambarish Ghosh, Vinod Srinivasan, Neha Yadav
Publikováno v:
Journal of Low Temperature Physics. 188:101-111
Multielectron bubbles (MEBs) are charged cavities in liquid helium which provide an interesting platform for the study of electrons on curved surfaces. Very recently, we have reported an experiment to trap these objects in a two-dimensional Paul trap
Publikováno v:
Journal of Low Temperature Physics. 187:618-626
An electron bubble in liquid helium-4 under the saturated vapor pressure becomes unstable and explodes if the pressure becomes more negative than −1.9 bars. In this paper, we use focused ultrasound to explode electron bubbles. We then image at 30,0
Autor:
Joseph Omorogbe, Rana B. Haider, Niall Breslin, Sinead M. Smith, Grainne Holleran, Humphrey J. O'Connor, Denise Brennan, Barry Hall, Deirdre McNamara, Colm O'Morain
Publikováno v:
European Journal of Gastroenterology & Hepatology. 27:1265-1269
Eradication rates for the standard first-line triple therapy for Helicobacter pylori infection have decreased in recent years. Sequential therapy has been suggested as an alternative. The efficacy of sequential therapy has not been assessed to date i
Publikováno v:
Journal of Low Temperature Physics. 178:78-117
An electron in liquid helium forces open a cavity referred as an electron bubble. These objects have been studied in many past experiments. It has been discovered that under certain conditions other negatively charged objects can be produced but the
Publikováno v:
Journal of Low Temperature Physics. 175:70-77
An electron injected into liquid helium forces open a small cavity called an electron bubble. Although one might expect these objects to have a simple structure, experiments have revealed several effects for which there is currently no explanation. I
Publikováno v:
Journal of Low Temperature Physics. 171:171-177
Within finite-range density-functional theory, we have addressed the photo-ejection of electrons hosted in 4He bubbles as a function of pressure at zero temperature. It is shown that, besides the 1s→1p and 1s→2p transitions that show up in the wh
Autor:
D. Jin, Humphrey J. Maris
Publikováno v:
Journal of Low Temperature Physics. 162:329-339
We describe experiments in which a sound pulse is used to inject small particles into liquid helium at temperatures between 1 and 3 K. The motion of these particles is then observed. We are able to observe the effect of applying an impulse to a parti