Domestic Determinants of Preferential Trade Agreements

The purpose of this paper is to expand previous research on the economic determinants of preferential trade agreements, both by using a updated data set and also by including new potential non-trade and domestic explanatory variables. I find that the differences in primary market sectors of trading partners, the differences in level of infrastructure, the size of countries\u27 agricultural sectors, and differences in countries\u27 degree of democratization are all significant factors in bilateral PTA creation, along with several other variables. While results may not be as strong as in earlier studies, there are several plausible explanations for this, and the inclusion of these domestic factors adds a non-trivial amount of predictive power over the trade-only gravity models used in previous research

A generalization of tree automata and its relation to matrix grammars

In this thesis we introduce alpha and beta tree acceptors, generalizations of tree automata. The alpha tree acceptors recognize a tree by final symbol and the beta tree acceptors by final state. We show that alpha and beta tree acceptors recognize the same sets of Gorn trees and demonstrate that there are sets of Gorn trees not recognizably by any alpha tree acceptor. The tree automata are equivalent to the one state alpha tree acceptors. We show that the languages of alpha tree acceptors are exactly those of matrix grammars and the derivation trees of matrix grammars are recognized by alpha tree acceptors. Finally we show that nondeterministic alpha tree acceptors are no more powerful than deterministic alpha tree acceptors

Effects of different yield functions and initial inventory on harvest schedules for Douglas-fir

The procedure of forest level harvest scheduling incorporates many inputs of an uncertain nature. Forest management planners must be aware of the possible effects of the use of erroneous input information on the results of their planning. With that knowledge they can better plan a risk management strategy and make appropriate adjustments in assumptions or recommendations. Two of the most important uncertain input elements are future yield predictions and initial inventory information. The objective of this study was to identify the size of effects on harvest schedules of using uncertain yield and inventory data, specifically for Douglas-fir of the Pacific Northwest. To do this sensitivity analysis, harvest schedules were developed using the sequential even-flow option of the TREES simulation model (Tedder et al. 1980) with a ceteris paribus format where all was held constant except the yield predictions or the initial inventory data. Several different yield models have been developed for predicting future yields of Douglas-fir. For extensive management, this study compares four plus an arbitrary adjustment of one of the four in a harvest scheduling context; hypothesizing that there should not be any meaningful differences in harvest schedules developed when using the different yields. The tested yields included Bulletin 201 (McArdle et al. 1930) , DFIT (Bruce et al. 1977, Reukema, Bruce 1977), DNR Empirical Yields (Chambers, Wilson 1972), Hoyer's Natural Stand Yields (Hoyer 1975), and Bulletin 201 less 15 percent. Bulletin 201 as modified by Beuter et al. (1976) , DFIT, and modified Bulletin 201 less 15 percent were tested for intensive management. Eight sample inventories were obtained that represent a spectrum of site class and initial structure. Each inventory is adjusted twice to make a total of 24 different inventories which are combined with the yield information to generate the harvest schedules. Relative differences in percent are reported with emphasis on first decade, last decade, and total planning horizon differences

Irrigated forage and livestock production in the Oregon Columbia Plateau counties : a preliminary report

Published January 1973. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo

Effects of projected yields and initial inventories on harvest schedules of Douglas-fir

Comparisons were made to determine how the uncertainty of initial inventories and projected yields affect harvest schedules for Douglas-fir. Results indicate that short-run harvests are most affected by errors in initial inventory, with the effect being less than the size of the error. Long-run harvests are most affected by yield projections and approach-to normality predictions

Stubble management influences soil freezing

Published January 1984. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo

Some Willamette hillslope erosion rates

Published April 1985. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo

Wind erosion control on irrigated Columbia Basin land : a handbook of practices

Published October 1976. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo

Annual cropping on shallow soils

Published January 1984. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo

Drainage for erosion control in western Oregon

Published February 1985. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo