Browsing by Author/Contributor "Cepel, Raina"
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Hydrogen storage in engineered carbon nanospaces
Burress, Jacob W., 1983-; Kraus, Michael A., 1978-; Beckner, Matt; Cepel, Raina; Suppes, Galen J.; Pfeifer, Peter; Wexler, Carlos, 1966- (Institute of Physics, 2009)It is shown how appropriately engineered nanoporous carbons provide materials for reversible hydrogen storage, based on physisorption, with exceptional storage capacities (~80 g H2/kg carbon, ~50 g H2/liter carbon, at 50 ... -
Quantum energy levels of hydrogen adsorbed on nanoporous carbons: an intrinsic probe for pore structure, and improving Monte Carlo simulations of adsorption [abstract]
Cepel, Raina; Wexler, Carlos, 1966-; Pfeifer, Peter; Kuchta, Bogdan; Firlej, Lucyna (2009)Hydrogen is the lightest molecule in nature, making both rotational and translational degrees of freedom eminently quantum mechanical (especially at low temperatures). For isolated molecules the first excited (degenerate) ... -
The spatial cross-correlation coefficient as an ultrasonic detection statistic
Cepel, Raina (University of Missouri--Columbia, 2007)In ultrasonics, image formation and detection are most commonly based on signal amplitude. Matched filtering is an amplitude independent approach, but requires accurate template estimation. In this work, we introduce the ... -
Structural and energetic factors in designing a perfect nano-porous sorbent for hydrogen storage [abstract]
Kuchta, Bogdan; Firlej, Lucyna; Wexler, Carlos, 1966-; Pfeifer, Peter; Cepel, Raina (2009)Carbons are one of several promising groups of materials for hydrogen storage by adsorption. However, the heat of hydrogen physisorption in such materials is low, in the range of about 4-8 kJ/mol which limits the total ...