Zobrazeno 1 - 10
of 35
pro vyhledávání: '"Donald Candela"'
Publikováno v:
Journal of Low Temperature Physics. 201:146-153
Pulsed NMR techniques have been used to study the dynamics of $$^3\hbox {He}$$ confined to the interior of the hexagonal nanochannels of MCM-41 for which the walls were coated with a monolayer of $$^4\hbox {He}$$ as determined by isotherm measurement
Publikováno v:
Journal of Low Temperature Physics. 196:308-313
MCM-41 is a unique mesoporous material with cylindrical-like pores that provide an ideal platform to study 1D properties of adsorbed atoms (Boninsegni and Moroni in J Low Temp Phys 118(1):1, 2000). In this research, we use pulsed NMR to measure the n
Publikováno v:
Journal of Low Temperature Physics. 185:354-362
We discuss the analysis of the experimental values of the nuclear spin–lattice and spin–spin relaxation times for the tunneling of $$^3$$ He as isotopic impurities in solid $$^4$$ He. These two relaxation times cannot be described quantitatively
Publikováno v:
Physical Review B. 95
Publikováno v:
Journal of Low Temperature Physics. 175:133-139
We present a new simplified derivation of the effect of lattice relaxation that accompanies the quantum tunneling of 3He impurities in solid 4He on the nuclear spin-lattice relaxation of the 3He impurities for very low impurity concentrations. As a r
Publikováno v:
Journal of Low Temperature Physics. 158:692-696
Recent experimental studies of solid 4He indicate a strong correlation between the crystal defects and the onset of a possible supersolid state. We use pulsed NMR techniques to explore the quantum dynamics of the 3He impurities in the solid 4He in or
Autor:
Donald Candela, Ronald L. Walsworth
Publikováno v:
American Journal of Physics. 75:754-757
In fluidized granular matter (such as rapidly flowing sand) heat can flow from colder to hotter granular temperatures, violating Fourier’s law. A simple heuristic explanation for this anomalous heat current is presented, based on the non-equilibriu
Publikováno v:
Granular Matter. 9:331-335
Nuclear magnetic resonance (NMR) experiments are described for gas-fluidized granular beds, which are important systems for many materials-processing operations. Using pulsed field gradient, magnetic resonance imaging, and hyperpolarized gas NMR, det
Publikováno v:
Magnetic Resonance Imaging. 23:203-207
We report initial NMR studies of gas dynamics in a particle bed fluidized by laser-polarized xenon (129Xe) gas. We have made preliminary measurements of two important characteristics: gas exchange between the bubble and emulsion phases and the gas ve
Publikováno v:
Magnetic Resonance Imaging. 21:287-292
We report initial NMR studies of continuous flow laser-polarized xenon gas, both in unrestricted tubing, and in a model porous media. The study uses Pulsed Gradient Spin Echo-based techniques in the gas-phase, with the aim of obtaining more sophistic