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  • 1
    Electronic Resource
    Electronic Resource
    The third-order polarizability γ of C60: The role of low-lying two-electron excited singlet states Ag and Hg (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 6603-6607 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The third-order polarizability γ of the C60 molecule has been calculated for the third harmonic generation at several incident frequencies using two different schemes of the sum-over-state (SOS) method, and the contribution of the low-lying singlet excited states as the second intermediate states has been analyzed. The group-theoretical analysis of the SOS expression clarifies that the 1Ag and 1Hg states are the only states that contribute to the γ as the second intermediate states. For the numerical analysis, the electronic states previously obtained in the semiempirical CNDO/S approximation with the singly and doubly excited configuration interaction method are used. It is found that the inclusion of the doubly excited configurations is essential in evaluating the γ. Those excited 1Ag and 1Hg states which make significant positive contributions to the γ are practically the doubly excited states. In order to secure error-free SOS calculations, equivalent but independent calculations have been also carried out with the frequency-dependent moment method. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481233
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  • 2
    Electronic Resource
    Electronic Resource
    On randomlyn-cyclic digraphs (1987)
    Springer
    Graphs and combinatorics 3 (1987), S. 227-238 
    Details
    ISSN: 1435-5914
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract A digraphD is called randomlyn-cyclic if for each vertexv ofD, every (directed) path with initial vertexv and having length at mostn − 1 can be extended to av − v (directed) cycle of lengthn. This notion was first introduced by Chartrand, Oellermann and Ruiz [3] and they determined all randomly 3, 4 and 5-cyclic diagraphs. In this paper, we will provide the characterization of randomlyn-cyclic digraphs forn ≥ 6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01788545
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  • 3
    Electronic Resource
    Electronic Resource
    Oxidative dehydrogenation of ethane on rare earth oxides: effects of chlorine additives in gas and solid phase on the oxidation over cerium oxide (1996)
    Springer
    Catalysis letters 42 (1996), S. 127-133 
    Details
    ISSN: 1572-879X
    Keywords: ethane ; oxidative dehydrogenation ; rare earth oxides ; cerium oxide ; tetrachloromethane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The oxidative dehydrogenation of ethane in the presence and absence of tetrachloromethane (TCM) has been investigated on La2O3, Sm2O3,Pr6O11 and CeO2 at 773 and 973 K. Although the introduction of TCM into the ethane feedstream produced no significant changes with La2O3, Sm2O3 and Pr6O11 at 773 K, the conversion of ethane and the selectivity to ethylene on CeO2 were distinctly enhanced by the addition of the chlorinated additive. At 973 K, with all of the rare earth oxides studied the selectivities to CH4 increased while those to CO2 decreased, the latter particularly significantly, suggesting that the further oxidation of CO and/ or CH4 is suppressed by the addition of the chlorinated additive. XPS measurements provide evidence for the introduction of Cl into the surface of CeO2, apparently forming CeOCl which is responsible for the enhancement observed in the reactions catalyzed by CeO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00810677
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  • 4
    Electronic Resource
    Electronic Resource
    Sex Pheromone of Japanese Giant Looper, Ascotis selenaria cretacea: Identification and Field Tests (1997)
    Springer
    Journal of chemical ecology 23 (1997), S. 2413-2423 
    Details
    ISSN: 1573-1561
    Keywords: Sex pheromone ; attractant ; Japanese giant looper ; Ascotis selenaria cretacea ; (Z,Z)-6,9-cis-3,4-epoxynonadecadiene ; (Z,Z,Z)-3,6,9-nonadecatriene ; pheromone biosynthesis-activating neuropeptide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The Japanese giant looper, Ascotis selenaria cretacea, is a serious defoliator of tea gardens in Japan. GC-MS analysis of the virgin female extract confirmed the presence of (Z,Z)-6,9-cis-3,4-epoxynonadecadiene. This compound had attracted male moths in a previous random screening test using C17–C23 epoxydienes synthesized in a racemic form. Further GC and HPLC analyses with chiral columns showed that the natural pheromone was composed of 3S,4R and 3R,4S isomers in a ratio of 53:47, although the field evaluation revealed stronger activity of the pure 3R,4S epoxide than of other enantiomeric mixtures. This result indicates that the sexual communication system of this Japanese subspecies differs from that of the species in Israel, which is selectively attracted to an isomer with the opposite configuration. Interestingly, the 3S,4R epoxide attracted another geometric male, Alcis angulifera, in our field tests. (Z,Z,Z)-3,6-9-Nonadecatriene, a parent olefinic compound of the epoxy pheromone, was also identified in the gland extract of A. s. cretacea, but its effect on the attractive activity of the epoxide was not assured in field tests. The amount of the triene increased in the virgin female during photophase and also after decapitation. The epoxy component completely disappeared after decapitation, but could be increased by an injection of subesophageal ganglion extract. The data suggest that the triene is a biosynthetic precursor of the epoxide and that a neuropeptide hormone (PBAN) regulates the epoxydation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/B:JOEC.0000006683.58028.1e
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  • 5
    Electronic Resource
    Electronic Resource
    Responses of Japanese Giant Looper Male Moth to Synthetic Sex Pheromone and Related Compounds (1999)
    Springer
    Journal of chemical ecology 25 (1999), S. 1633-1642 
    Details
    ISSN: 1573-1561
    Keywords: Sex pheromone ; attractant ; Japanese giant looper ; Ascotis selenaria cretacea ; (Z,Z)-6,9-cis-3,4-epoxynonadecadiene ; field attractant ; disruption ; electroantennogram
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The Japanese giant looper, Ascotis selenaria cretacea, is a serious defoliator of tea gardens in Japan. In Mie Prefecture male moths were dose-dependently attracted to rubber septa baited with 0.1–10.0 mg of the sex pheromone component (Z,Z)-6,9-cis-3,4-epoxynonadecadiene. Monitoring by pheromone traps showed three flight periods (June, July, and August–September). A septum with a 1-mg dose was still active after exposure for over three months in the field, but the number of males captured by the old lure was one fifth of that captured by a fresh lure. The parent 3,6,9-triene, a minor pheromonal component, showed a synergistic effect on male attraction when mixed with the pheromonal epoxydiene at a very low ratio, but the 1:1 mixture hardly captured any male moths. Attraction was also effectively inhibited by the positional isomers (6,7- and 9,10-epoxydienes), which exhibited rather strong electrophysiological activities on the male antennae. When these related compounds were placed around a trap baited with the synthetic pheromone, the number of captured moths remarkably decreased, which indicates the possibility of using the compounds as a disruptant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020897118342
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  • 6
    Electronic Resource
    Electronic Resource
    Construction of Weighing Matrices W(17, 9) Having the Intersection Number 8 (1998)
    Springer
    Designs, codes and cryptography 15 (1998), S. 259-269 
    Details
    ISSN: 1573-7586
    Keywords: weighing matrix
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract It is unknown( [1], [2], [4] ) whether there exists a weighing matrix W(17,9) or not. The intersection number of W(17,9) is 6 or 8. We completed the classification of weighing matrices W(17, 9) having the intersection number 8. These matrices are classified into 925 non-equivalent classes. We shall show eight representative weighing matrices only together with their automorphism groups and g-distributions. Of these eight matrices, two have the same g-distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008321209012
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  • 7
    Electronic Resource
    Electronic Resource
    Prevention of spinal cord injury after cross-clamping of the thoracic aorta (1984)
    Springer
    Surgery today 14 (1984), S. 159-162 
    Details
    ISSN: 1436-2813
    Keywords: paraplegia ; spinal cord injury ; aortic cross-clamping ; cerebrospinal fluid pressure ; somatosensory evoked potentials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Paraplegia has been a devastating and unpredictable complication following surgical procedures involving temporary occlusion of the thoracic aorta. This study was undertaken to determine the effect of the pressure gradient between the aortic pressure distal to the occluding aortic clamp and cerebrospinal fluid pressure, defined as “Relative spinal cord perfusion pressure” (RSPP) on the development of the ischemic spinal cord injury. In twelve mongrel dogs, the thoracic aorta just distal to the left subclavian artery was cross-clamped. Somatosensory evoked potentials (SEP) were generated by peripheral stimulation of the bilateral peroneal nerves. After complete loss of SEP was evident, six dogs, Group 1, were subjected to occlusion of the descending thoracic aorta for a period of 20 minutes with maintenance of 0 mmHg of RSPP, by an injection of normal saline into the subarachnoid space. Six other dogs, Group 2, likewise underwent 40 minutes of aortic occlusion, keeping the RSPP at 15 mmHg by withdrawal ofcerebrospinal fluid. All the dogs in Group 1 developed paraplegia, whereas all the dogs in Group 2 demonstrated complete postoperative recovery without any neurological sequelae. Thus, RSPP is a most important factor in the development of the ischemic spinal cord injury during the temporary thoracic aortic occlusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02469810
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  • 8
    Electronic Resource
    Electronic Resource
    C k -factorization of complete bipartite graphs (1988)
    Springer
    Graphs and combinatorics 4 (1988), S. 111-113 
    Details
    ISSN: 1435-5914
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract In this paper, it is shown that a necessary and sufficient condition for the existence of aC k-factorization ofK m,n is (i)m = n ≡ 0 (mod 2), (ii)k ≡ 0 (mod 2),k ≥ 4 and (iii) 2n ≡ 0 (modk) with precisely one exception, namely m =n = k = 6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01864159
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