11,458 research outputs found
Competition between structural distortion and magnetic moment formation in fullerene C
We investigated the effect of on-site Coulomb interactions on the structural
and magnetic ground state of the fullerene C based on
density-functional-theory calculations within the local density approximation
plus on-site Coulomb corrections (LDA+). The total energies of the high
symmetry () and distorted () structures of C were
calculated for different spin configurations. The ground state configurations
were found to depend on the forms of exchange-correlation potentials and the
on-site Coulomb interaction parameter , reflecting the subtle nature of the
competition between Jahn-Teller distortion and magnetic instability in
fullerene C. While the non-magnetic state of the distorted
structure is robust for small , a magnetic ground state of the undistorted
structure emerges for larger than 4 eV when the LDA
exchange-correlation potential is employed.Comment: 4 figures, 1 tabl
Consumer Valuation of the Second Generation of Genetically Modified (GM) Foods with Benefits Disclosure
Employing contingent valuation method (CVM), the study explores whether or not consumers risk/benefit beliefs and knowledge about GM foods affect their behavior as measured by willingness to pay (WTP) a premium for GM beef with benefits. The results demonstrate that risk/benefit perceptions play a significant role to elicit WTP for GM beef with benefitsConsumer/Household Economics,
THE EFFECTS OF RISK PERCEPTIONS ON CONSUMER PREFERENCES FOR BIOTECH LABELING
Consumer/Household Economics,
A MULTINOMIAL LOGIT MODEL OF CONSUMER PERCEPTIONS FOR BIOTECH FOOD LABELING
A multinomial logit analysis is employed to analyze consumers' perceptions about purchasing biotech foods and their preferences for mandatory and voluntary labeling. Results showed that consumers who are sensitive to the possible side effects of biotech crops on wildlife and the environment are more likely to support a mandatory labeling policy. Results also indicated that respondents who believe biotech foods may have unforeseen health risks are more likely to favor mandatory labeling. Furthermore, the study found that respondents who are willing to buy a meat product produced using biotechnology are more likely to favor a voluntary labeling policy.Institutional and Behavioral Economics,
- …