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Träfflista för sökning "WFRF:(Li Zhong) srt2:(2000-2004)"

Sökning: WFRF:(Li Zhong) > (2000-2004)

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  • Huang, Z. L., et al. (författare)
  • Novel heterocycle-based organic molecules with two-photon induced blue fluorescent emission
  • 2003
  • Ingår i: Journal of Materials Chemistry. - : Royal Society of Chemistry (RSC). - 0959-9428 .- 1364-5501. ; 13:4, s. 708-711
  • Tidskriftsartikel (refereegranskat)abstract
    • Two-photon absorption and two-photon induced blue emission characteristics of a series of heterocycle-based organic molecules are investigated experimentally and by quantum-chemical computations. The molecules consist of a typical A-pi-A' structure, where heterocycle, styryl and formyl groups are employed as A, pi-conjugated and A' moieties, respectively. Experimental results indicate that significant enhancements in the blue emission efficiency and two-photon absorption cross-sections can be achieved by replacing S and O atoms with an N atom in the heterocycle acceptor moiety, which is also supported by the quantum-chemical computations. Additionally, larger two-photon absorption cross-sections can be obtained by choosing appropriate solvents, as indicated by the computations.
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  • Li, Chuan-Zhong, et al. (författare)
  • Contingent Valuationof the Natura 2000 Nature Conservation Program in Finland
  • 2000
  • Ingår i: Forestry (London). - London : Oxford journals. - 0015-752X .- 1464-3626. ; 73:2, s. 119-128
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper shows how contingent valuation studies can produce relevant information for public nature conservation decisions. The study analyses the preferences of Finnish households for a nature conservation programme, Natura 2000 Network, by applying a dichotomous choice referendum model of the contingent valuation survey. In order to study the influence of attitudes and beliefs on a choice between the status quo and the new conservation project, an attitude-behaviour framework is applied. Beliefs concerning the outcomes of the nature conservation policy and evaluations of their importance describe how attitudes towards the programme are formed. The choices in the referendum are explained using a logit regression model and are found to be a function of attitude and socio-economic variables. The probability of a person supporting the proposed conservation level depends significantly on the income, age and background (urban-rural) of the respondent. The estimated model of choice behaviour is used to calculate the average willingness to pay for the Natura 2000 Network, which is also compared to the costs of the conservation programme.
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