Results 211 to 220 of about 2,750 (239)

Thermal conductivity of parahydrogen

Journal of Chemical & Engineering Data, 1984
Mesure experimentale de la conductivite thermique du parahydrogene pour 8 isothermes de 100 a 275 K avec intervalles de 25 K, des pressions jusqu'a 12 MPa et des densites de 0 a 12 mol ...
openaire   +1 more source

Continuous hyperpolarization with parahydrogen in a membrane reactor

Journal of Magnetic Resonance, 2018
Hyperpolarization methods entail a high potential to boost the sensitivity of NMR. Even though the "Signal Amplification by Reversible Exchange" (SABRE) approach uses para-enriched hydrogen, p-H2, to repeatedly achieve high polarization levels on target molecules without altering their chemical structure, such studies are often limited to batch ...
Sören, Lehmkuhl, Martin, Wiese, Lukas, Schubert, Mathias, Held, Markus, Küppers, Matthias, Wessling, Bernhard, Blümich   +6 more
openaire   +2 more sources

An inexpensive apparatus for up to 97% continuous-flow parahydrogen enrichment using liquid helium.

Journal of magnetic resonance (San Diego, Calif. 1997 : Print), 2020
Nuclear spin hyperpolarization derived from parahydrogen can enable nuclear magnetic resonance spectroscopy and imaging with sensitivity enhancements exceeding four orders of magnitude. The NMR signal enhancement is proportional to 4xp-1, where xp is the
Yong Du, Ronghui Zhou, M. Ferrer, Minda Chen, John Graham, Bill Malphurs, G. Labbé, Wenyu Huang, C. Bowers   +8 more
semanticscholar   +1 more source

Raman gain measurement in solid parahydrogen

Optics Letters, 2000
We report a steady-state Raman gain measurement of the Q(1)(0) transition (v = 1 ? 0, J = 0 ? 0) in solid parahydrogen. We carry out measurements by pumping with a continuous-wave frequency-doubled YAG laser at 532 nm and observing the direct amplification of a probe-laser beam for the first Stokes transition at 683 nm.
M, Katsuragawa, K, Hakuta
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Isothermal compressibility of solid parahydrogen

Journal of Low Temperature Physics, 1970
The method of the determination of isothermal compressibility of solid parahydrogen on the basis of dielectric constant measurements has been described. The data on isothermal compressibility of solid parahydrogen in the temperature range of 6–14.5°K and at pressures of 0–180 atm have been presented.
B. G. Udovidchenko, V. G. Manzhelii
openaire   +1 more source

Improving NMR and MRI Sensitivity with Parahydrogen

2012
Parahydrogen induced polarisation (PHIP) has wide utility in NMR and MRI as it can increase the sensitivity of both techniques. The transfer of spin order from parahydrogen to nuclei in the analyte leads to an increased magnetic response following interrogation by RF pulses.
Simon B, Duckett, Ryan E, Mewis
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Nonequilibrium Nuclear Spin States of Ethylene during Acetylene Hydrogenation with Parahydrogen over Immobilized Iridium Complexes

Doklady. Physical chemistry, 2023
I. V. Skovpin, S. V. Sviyazov, D. B. Burueva, L. M. Kovtunova, A. Nartova, R. Kvon, A. V. Bukhtiyarov, C. M. O. T. R. I. V. Koptyug   +7 more
semanticscholar   +1 more source

Understanding Heterogeneous Catalytic Hydrogenation by Parahydrogen-Induced Polarization NMR Spectroscopy

ACS Catalysis, 2023
Weiyu Wang, Qiang Wang, Jun Xu, F. Deng
semanticscholar   +1 more source

Catalysis of the Ortho-Parahydrogen Conversion

1960
Certain metallic oxides such as chromic oxide, cerium oxide, and neodymium oxide have been reported as highly effective catalysts for ortho-parahydrogen conversion because of their paramagnetic properties. We were familiar with the performance of chromic oxide on alumina pellets since this has been successfully used in the CEL liquefier s over a period
D. H. Weitzel, J. W. Draper, O. E. Park, K. D. Timmerhaus, C. C. Valin   +4 more
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parahydrogen, n.

2023
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