Economically optimal management of a continuous cover forest is considered here. Initially, there is a large number of trees of different sizes and the forest may contain several species. We want to optimize the harvest decisions over time, using continuous cover forestry, which is denoted by CCF. We maximize our objective function, the expected present value, with consideration of stochastic p...

#465 Summary: The problem the economists in the field of renewable resources face is that of determining and recommending the harvest intensity that will maximize the economic value to the consuming society and also maximize the producers' surplus at a level of production in perpetuity. The optimal control theoretic approach was employed in this paper to theoretically answer this problem within...

We consider the harvest of a certain proportion of a population that is modeled by an integro-difference equation. This model is discrete in time and continuous in the space variable. The dispersal of the population is modeled by an integral of the population density against a kernel function. The control is the harvest, and the goal is to maximize the profit. The optimal control is characteriz...

Over 100 native herbaceous forest perennials are harvested in the United States. Management of these populations for continued survival requires information on the long-term effects of varied harvesting levels on populations of forest perennials. Allium tricoccum Ait. is a species that is harvested throughout its range for its edible bulb. We examined the recovery of A. tricoccum populations ov...

Harvest and post-harvest operations constitute principal constraints to rice production, especially in irrigated systems, because of the larger yield that has to be handled. Post-harvest crop losses of up to 35% have been reported and attributed to inefficiency of manual threshing of rice by small-scale farmers. This leads to poor grain quality and rejection of locally produced rice. The Africa...

INTRODUCTION Despite renewed clinical interest in radial artery grafts (RA) for coronary artery bypass grafting, there is a paucity of controlled prospective data on its efficacy. We report on the rate of harvest related complications from a randomized radial artery study. METHODS Two hundred eighty nine patients were divided into two groups. Group 1 received RA grafts (n=154 patients) and Gr...

EDITOR’S NOTE: This is the first in a four-part series of articles dealing with the Church’s ministry to the elderly. This article will attempt to give a brief profile of the problems faced by the aging. Succeeding articles will treat tradi­ tional Church responses to the needs of the elderly and look at some new approaches to the situa­ tion and new directions of action, including South Bend H...