Elastic Effects in Disordered Nematic Networks

Elastic effects in a model of disordered nematic elastomers are numerically investigated in two dimensions. Networks crosslinked in the isotropic phase exhibit unusual soft mechanical response against stretching. It arises from gradual alignment of orientationally correlated regions that are elongated along the director. A sharp crossover to a macroscopically aligned state is obtained on further stretching. The effect of random internal stress is also discussed.Comment: 5 pages, 5 figure

Optimal Timber Rotation on Multiple Stands with an Asymmetric Externality

Replaced with revised version of paper 07/28/05.forest economics, multiple stands, non-timber goods, flood risk, spatial externality, additivity properties, Resource /Energy Economics and Policy, Q23, Q57,

Quantum Radion on de Sitter branes

The quantum fluctuation of the relative location of two (n-1)-dimensional de Sitter branes (i.e., of n spacetime dimensions) embedded in the (n+1)-dimensional anti-de Sitter bulk, which we shall call the quantum radion, is investigated at the linear perturbation level. The quantization of the radion is done by deriving the effective action of the radion. Assuming the positive tension brane is our universe, the effect of the quantum radion is evaluated by using the effective Einstein equations on the brane in which the radion contributes to the effective energy momentum tensor at the linear order of the radion amplitude. Specifically, the rms effective energy density arising from the quantum radion is compared with the background energy density. It is found out that this ratio remains small for reasonable values of the parameters of the model even without introducing a stabilizing mechanism for radion, although the radion itself has a negative mass squared and is unstable. The reason behind this phenomenon is also discussed.Comment: 17 pages, no figure

Fishery Co-Management in Japanese Coastal Fisheries

This paper presents an empirical analysis of the Japanese coastal fishery co-management system. In particular, the paper focuses on the effectiveness of Fishery Management Organizations (FMOs), which are established by groups of fishermen and set rules and regulations that they self-enforce. The paper finds that FMOs engaged actively in marketing practices in their output markets significantly increased their member fishermen's revenue. Proceeds sharing rules, where individual proceeds are pooled and shared among the members, appeared to have marginal effects despite of several anecdotal evidence that suggests otherwise. Findings suggest that benefit gains from the output markets is substantial in successful fishery co-management.fishery co-management, marketing, sharing rules, Japan, Resource /Energy Economics and Policy,