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  • 1
    Electronic Resource
    Electronic Resource
    Rotational tunneling of ammonia in (NH3)K3C60 (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 10969-10973 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The rotational dynamics of NH3 in the ammoniated fulleride (NH3)K3C60 are studied by the inelastic neutron scattering technique. Well-defined excitations appear in the low-energy spectra at 1.5 K as a broad band centered at ∼350 μeV with shoulders at ∼240 and 590 μeV. The temperature dependence of their intensities, energies, and widths is consistent with their assignment to rotational tunneling transitions of the NH3 molecule. The estimated barrier of the threefold hindrance potential to rotation of the H atoms about the K–N axis is ∼5.7 meV. The existence of minority hindering sites with both larger (∼8 meV) and smaller (∼2 meV) torsional barriers shows that orientational disorder effects survive in (NH3)K3C60 even at low temperatures. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480460
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Structural Characterization of D〈sub〉2〈/sub〉 in Cu〈sub〉3〈/sub〉(1,3,5-Benzenetricarboxylate)〈sub〉2〈/sub〉 Using Neutron Powder Diffraction (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 1601-1604 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Sorption of ten different quantities of D2 within the porous coordination metal frameworkCu3(1,3,5-benzenetricarboxylate)2 were studied using neutron powder diffraction. D2 sorption in theporous material reached saturation (at 25 K) at an amount equivalent to ~6.5 wt. % H2. Rietveldanalyses revealed that at saturation there are two saturated small pore and three saturated large poresites, in addition to the primary site at the coordinatively unsaturated Cu. We reveal that the linkedbimodal pore system provides up to nine distinct sites for D2, at moderate D2 concentrations up tosaturation. Intermediate sites are attributed to local D2-D2 interaction within the confined porespaces. Within the small and large pores one, and two, intermediate sites are identified, respectively.The population of D2 at each site was found to affect the host lattice
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.1601.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Self-instruction training with preschoolers: Generalization to proximal and distal problem-solving tasks (1984)
    Springer
    Cognitive therapy and research 8 (1984), S. 427-438 
    Details
    ISSN: 1573-2819
    Source: Springer Online Journal Archives 1860-2000
    Topics: Psychology
    Notes: Abstract Twenty-seven preschool 4- and 5-year-olds were matched on a range of assessment measures and assigned to one of three instruction groups: a self-instruction group, a skills training group, and a no-treatment control group. For the first five weekly intervention sessions, treatment subjects were trained on the concepts of same and different in a visual discrimination format. During the last four intervention sessions, treatment subjects were trained on maze and size sequencing tasks. Instructional training effects were assessed after 5 and 9 weeks of training with two measures of proximal generalization, the Matching Familiar Figures Test (MFFT) and a picture sequencing task, and one measure of distal generalization, a revised version of the Tower of Hanoi. Only the self-instruction group demonstrated significant improvement on the MFFT, the picture sequencing task, and the more difficult flat ending problems on the Tower of Hanoi. These results with preschool children support the potential for generalization of self-instruction training effects to tasks both conceptually similar and dissimilar to the original training tasks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01173316
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    Paper (German National Licenses)
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