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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 70 (2000), S. S203 
    ISSN: 1432-0649
    Keywords: PACS: 42.65.Ky; 32.80.Wr; 42.65.Re
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The phase-matching process of high-order harmonics generated in rare gases confined in a hollow-fiber wave-guide is investigated theoretically. A simple calculation is built to explore the effects of several important parameters in phase-matched high-order harmonics generation. A cutoff intensity for a certain order phase-matched harmonic is found, which depends on the maximum order of phase-matched harmonic. The calculations show that an ultrashort laser pulse and the medium with a higher ionization potential are necessary for generation of higher-order phase-matched harmonics.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1439-5444
    Keywords: Key wordsLasius spp. ; Temporary parasitic ant ; Naturally mixed colony ; Nestmate recognition ; Cuticular profiles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Workers of the temporary parasitic ant Lasius sp. were perfectly compatible with their hosts Lasius fuliginosus. Aggression was never seen between allospecific nestmates in either field or laboratory. In the laboratory, trophallaxis and allogrooming between allospecific nestmates were statistically more frequent than that between conspecifics. These ants were highly aggressive toward individuals of either species from another mixed colony located 1 km away, indicating that they discriminated nestmates and nonnestmates regardless of the species to which they belonged. No aggressive actions, however, were observed between two neighboring mixed nests located 5 m apart. We have not considered, however, the relationship of the two neighboring nests: the two nests may have been two subunits of the same family or sister colonies, or may have been different colonies but discriminated from distant aliens. Gas chromatography analysis on the total cuticular extracts showed that Lasius sp. and L. fuliginosus possess distinct cuticular profiles, even though they were collected from the same mixed colony.
    Type of Medium: Electronic Resource
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