Results 321 to 330 of about 3,313,131 (376)
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Stopping Power of Alpha Particles in Helium Gas
Herald of the Bauman Moscow State Technical University Series Natural Sciences, 2020The stopping power and the range of alpha particles emitted from Am-241 source has been investigated in helium gas at different pressures of 0 to 1 bar, using surface barrier silicon detector in the large vacuum chamber.
M. Hiwa
semanticscholar +1 more source
Acta Radiologica, 1998
Purpose: To evaluate histological changes and duration of enhancement after the intra-arterial injection of helium gas microbubbles in comparison with conventionally used carbon dioxide (CO2) microbubbles at US Material and Methods: Four different doses of helium gas microbubbles (0, 0.1, 0.2 and 0.5 ml/kg) mixed with normal saline and own blood were
T. Nishiharu +5 more
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Purpose: To evaluate histological changes and duration of enhancement after the intra-arterial injection of helium gas microbubbles in comparison with conventionally used carbon dioxide (CO2) microbubbles at US Material and Methods: Four different doses of helium gas microbubbles (0, 0.1, 0.2 and 0.5 ml/kg) mixed with normal saline and own blood were
T. Nishiharu +5 more
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Sensitization of glioblastoma cells to temozolomide by a helium gas discharge tube
, 2020Glioblastoma is one of the most aggressive brain cancers. Chemotherapy is a standard modality for its therapy. Here, we demonstrated a novel strategy using a helium gas discharge tube as a tunable electromagnetic emission source to sensitize glioblastoma
X. Yao +6 more
semanticscholar +1 more source
Superconductors Science and Technology, 2018
High-temperature superconducting (HTS) direct current (dc) power cables allow high levels of power transmission and distribution at low loss and can be tailored to effectively limit fault currents.
D. C. van der Laan +4 more
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High-temperature superconducting (HTS) direct current (dc) power cables allow high levels of power transmission and distribution at low loss and can be tailored to effectively limit fault currents.
D. C. van der Laan +4 more
semanticscholar +1 more source
Solid State Phenomena, 2006
Gas quenching in vacuum furnaces is an increasingly attractive option because it has a low environmental impact and the least distortion of parts being treated. Whilst nitrogen is by far the most common quenching gas, helium is a viable option where higher cooling rates are required, particularly for carburised components.
Paul Stratton +2 more
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Gas quenching in vacuum furnaces is an increasingly attractive option because it has a low environmental impact and the least distortion of parts being treated. Whilst nitrogen is by far the most common quenching gas, helium is a viable option where higher cooling rates are required, particularly for carburised components.
Paul Stratton +2 more
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Polarizability of Helium and Gas Metrology
Physical Review Letters, 2007Using a quasispherical, microwave cavity resonator, we measured the refractive index of helium to deduce its molar polarizability A(epsilon) in the limit of zero density. We obtained (A(epsilon,meas) - A(epsilon,theory))/A(epsilon) = (-1.8 +/- 9.1) x 10(-6), where the standard uncertainty (9.1 ppm) is a factor of 3.3 smaller than that of the best ...
J. W. SCHMIDT +3 more
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Transitions to turbulence in helium gas
Physical Review A, 1987Experimental study in gaseous helium at low temperature (4 K) of thermal convection up to a Rayleigh number $R={10}^{11}$. Three regimes are observed, a chaotic state up to $R=2.5\ifmmode\times\else\texttimes\fi{}{10}^{5}$, a soft-turbulence state up to $R=4\ifmmode\times\else\texttimes\fi{}{10}^{7}$, and then a hard-turbulence state.
, Heslot, , Castaing, , Libchaber
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Turbulence in helium-gas free convection
Physical Review A, 1989Results on a Rayleigh-B\'enard experiment in helium gas at 5 K in a cylindrical cell of aspect ratio 1 are presented. The Rayleigh number spans a range from ${10}^{5}$ to ${10}^{12}$. A large-scale coherent flow is observed via the correlation of two adjacent temperature probes.
, Sano, , Wu, , Libchaber
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Diffusion of hydrogen atoms in helium gas and helium atoms in hydrogen gas
Physical Review A, 2002The potential of Meyer and Frommhold describing the interaction between hydrogen and helium atoms is used to calculate the diffusion coefficients of hydrogen atoms in helium gas and helium atoms in hydrogen gas as functions of temperature, taking into account higher-order corrections of transport theory.
H-K. Chung, A. Dalgarno
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