Rosa M Alzamora

Evaluación del costo de producción para faenas de aserrío portátil

SUMMARY New technologies in portable bandsaw mill operations for small and medium size production scale shows several advantages face to traditional saw practice in the country. The main importance aspects are better yield of raw material, lowness surface roughness of sawn timber, great equipment mobility and versatility in cutting programs. However, production costs involved in each operation is a fundamental aspect to consider, because determine his feasibility. The study developed shows a detailed production costs analysis in different scenarios, for bandsaw mill operations, reflecting consistent results in computer program developed for this study, concerning technical and economical feasibility in real operations.

Evaluación de pérdidas en volumen comercial de Pinus radiata por efecto de Dothistroma septospora en distintos escenarios de manejo y control químico, en la provincia de Valdivia

Este estudio presenta la evaluacion fisica y economica de distintos regimenes silviculturales que consideran la aplicacion de pesticidas para controlar Dothistroma en un ensayo de Pinus radiata. En el ensayo estan representadas varias situaciones de manejo y control quimico. En tal sentido, el objetivo fue evaluar la eficiencia de este control sobre el dano de Dothistroma en terminos del desempeno fisico y economico de las plantaciones al turno de la rotacion. Los resultados indican que el control quimico aplicado fue eficaz en salvamento de volumen; no obstante, al evaluar dicha decision desde el punto de vista economico, resulta inconveniente, siendo los costos del control muy superiores a los beneficios del salvamento en volumen.

Using a production approach to estimate economic weights for structural attributes of Pinus radiata wood

Abstract We modeled the technical relationships between volume of Pinus radiata D. Don structural lumber (with stiffness>8 GPa) and log attributes using a stochastic frontier approach. The production models were Cobb–Douglas and Translog, while the log attributes were small end diameter (SED), wood stiffness (STF), and largest branch (LBR); however, the effect of the latter trait was not significant (p>0.05). Economic values of log traits were represented by their values of marginal product (VMP). The coefficients for the Cobb–Douglas frontier were statistically significant and the model met most of the production theoretical properties. VMP derived from the Cobb–Douglas were 2.23 NZ

Valoración de diámetro menor, ramas y módulo de elasticidad en trozas de Pinus radiata mediante una regresión parcial

/cm for SED and 16.88 NZ

Using Conditional Value at Risk (CVaR) to select radiata pine trees for operational deployment

/GPa for STF. The Translog frontier coefficients were also significant (p<0.05) and VMP derived from this model were 1.67 NZ

A hedonic approach to value Pinus radiata log traits for appearance-grade lumber production.

/cm for SED and 9.15 NZ

Building deployment portfolios for genotypes under performance instability

/GPa for STF. Thus, for the analyzed production stage, changes to SED and STF were relevant for improving log value recovery above MSG8+. Technical efficiency derived from the frontiers allowed to identify and characterize the best logs to produce structural grades with stiffness of 8 GPa or higher.

A DEA approach to assess the efficiency of radiata pine logs to produce New Zealand structural grades

Los valores economicos de atributos de calidad de madera de P. radiata son una guia para tomar decisiones en mejoramiento genetico y segregacion de trozas, porque permiten focalizarse en los atributos con mayor valor; no obstante, en Chile, dicha informacion no ha sido reportada. Este estudio aplico el enfoque de las regresiones parciales para valorar los atributos de troza: diametro menor, diametro de rama y modulo de elasticidad dinamico (MoEd) a partir de una muestra de 71 trozas no podadas. El retorno de conversion promedio de las trozas fue 57 US

Valoración de diámetro menor, ramas y módulo de elasticidad en trozas de Pinus radiata mediante una regresión parcial Valuing small end diameter, branches and modulus of elasticity in Pinus radiata logs by a partial regression

m-3 y mostro una positiva y significativa correlacion con el MoEd. La regresion genero valores comparables a estudios afines; asi, los valores economicos fueron 0,6 US

Using Conditional Value at Risk (CVaR) to select radiata pine trees for operational deployment Uso del valor en riesgo condicional (CVaR) para seleccionar árboles de Pinus radiata para establecimiento operacional

cm-1 y 17,1 US