AGRICULTURAL COOPERATIVE ENTERPRISE IN THE TRANSITION FROM SOCIALIST COLLECTIVE FARMING

Cooperative enterprise has appeal as a means of filling gaps in the economic institutions of the rural sectors of the transition economies of Central and Eastern Europe and the former Soviet Union. But in addition to problems that have faced cooperatives in the West because of their inherent characteristics, the Soviet-era legacy created cultural burdens that cooperatives will have to overcome. A review of countries’ experiences since 1989 indicates some commonalities in attempts to create “new cooperatives,” but also instructive differences across countries. The evidence so far is unfavorable for cooperatives in agricultural production. In marketing and input supply the current situation is more promising. In both production and marketing, the economic institutions remain in flux. Unique approaches involving cooperatives may take permanent root, but their long-term prospects are in doubt.Agribusiness,

Agricultural Cooperative Enterprise in the Transition from Socialist Collective Farming

Cooperative enterprise has appeal as a means of filling gaps in the economic institutions of the rural sectors of the transition economies of Central and Eastern Europe and the former Soviet Union. But in addition to problems that have faced cooperatives in the West because of their inherent characteristics, the Soviet-era legacy created cultural burdens that cooperatives will have to overcome. A review of countries’ experiences since 1989 indicates some commonalities in attempts to create “new cooperatives,†but also instructive differences across countries. The evidence so far is unfavorable for cooperatives in agricultural production. In marketing and input supply the current situation is more promising. In both production and marketing, the economic institutions remain in flux. Unique approaches involving cooperatives may take permanent root, but their long-term prospects are in doubt.Agribusiness,

A saddle in a corner - a model of collinear triatomic chemical reactions

A geometrical model which captures the main ingredients governing atom-diatom collinear chemical reactions is proposed. This model is neither near-integrable nor hyperbolic, yet it is amenable to analysis using a combination of the recently developed tools for studying systems with steep potentials and the study of the phase space structure near a center-saddle equilibrium. The nontrivial dependence of the reaction rates on parameters, initial conditions and energy is thus qualitatively explained. Conditions under which the phase space transition state theory assumptions are satisfied and conditions under which these fail are derived

Four-vortex motion around a circular cylinder

The motion of two pairs of counter-rotating point vortices placed in a uniform flow past a circular cylinder is studied analytically and numerically. When the dynamics is restricted to the symmetric subspace---a case that can be realized experimentally by placing a splitter plate in the center plane---, it is found that there is a family of linearly stable equilibria for same-signed vortex pairs. The nonlinear dynamics in the symmetric subspace is investigated and several types of orbits are presented. The analysis reported here provides new insights and reveals novel features of this four-vortex system, such as the fact that there is no equilibrium for two pairs of vortices of opposite signs on the opposite sides of the cylinder. (It is argued that such equilibria might exist for vortex flows past a cylinder confined in a channel.) In addition, a new family of opposite-signed equilibria on the normal line is reported. The stability analysis for antisymmetric perturbations is also carried out and it shows that all equilibria are unstable in this case.Comment: 27 pages, 13 figures, to be published in Physics of Fluid