Analysis of guidance law performance using personal computers

A point mass, three-degree of freedom model is presented as a basic development tool for PC based simulation models. The model has been used in the development of guidance algorithms as well as in other applications such as performance management systems to compute optimal speeds. Its limitations and advantages are discussed with regard to the windshear environment. A method for simulating a simple autopilot is explained in detail and applied in the analysis of different guidance laws

Increasing Cultivar Diversity of Processing Tomato under Large Scale Organic Production in California

At an organic farm in California, higher plant diversity was hypothesized to enhance ecosystem functions and services. Plant diversity was manipulated temporally and spatially: mustard cover crop vs. no cover crop (fallow) in winter, and mixtures with one (farmer’s best choice), three, or five processing tomato cultivars in summer. Soil N, soil microbial biomass, crop nutrient uptake, canopy light interception, disease, GHG emissions and biomass were measured. Results show that the mustard cover crop reduced soil nitrate (NO3-) in winter and also during the tomato crop, which was associated with decreased growth and canopy development. All cultivar mixtures had fairly similar yield and shoot biomass. The ‘choice cultivar’ (i.e. farmer’s best choice) showed plasticity depending on the mixture, tending to have higher biomass production in mixtures. This study shows the complexity of cultivar-mixture interactions. To achieve the greatest benefit for ecosystem functions in organic farming, mixtures require greater understanding of cultivar plasticity and phenological and physiological trait diversity

An Impact Analysis of the Forest Occupancy Management Project: Doña Remedios Trinidad, Bulacan

This article is a product of a nine-month training and application program implemented by the micro component of the Economic and Social Impact Analysis/Women in Development (ESIA/WID) and the Food Systems Program of the East-West Center Resource Systems Institute (RSI). It focuses on two primary areas of concern: the cooperator’s income structure before and after joining the program and the actual resource conservation/depletion as a direct offshoot of the program. It also includes analysis of indirect impacts of the Bureau of Forest Development in the area.forestry sector, impact analysis

Growth Convergence and Spending Efficiency among Filipino Households

A growth model is used in the context of Sala-i-Martin’s definition of conditional convergence to assess the household income dynamics in segmented groups at the provincial level in the Philippines. There is a direct relationship between spending efficiency and income growth convergence across income groups. The lower income convergence rate among low income households can be attributed to their relatively less efficient access to the factors of production. The study provides tools in identifying targeted intervention strategies that will facilitate poverty alleviation among the households at the provincial level. The viability of poverty alleviation strategy can be assessed in terms of convergence of the different income groups. Low income groups converging slower than the high income groups support the recent data on measures of inequality in the Philippines (very minimal movement among the indicators). In order to alleviate inequality, the low-income group should be targeted for poverty-alleviating interventions like the conditional cash transfer.

An Impact Analysis of the Forest Occupancy Management Project: Doña Remedios Trinidad, Bulacan

This article is a product of a nine-month training and application program implemented by the micro component of the Economic and Social Impact Analysis/Women in Development (ESIA/WID) and the Food Systems Program of the East-West Center Resource Systems Institute (RSI). It focuses on two primary areas of concern: the cooperator’s income structure before and after joining the program and the actual resource conservation/depletion as a direct offshoot of the program. It also includes analysis of indirect impacts of the Bureau of Forest Development in the area.forestry sector, impact analysis

The complex high order Toda lattice and polynomials generated by three term recurrence relations

Se estudia la relación entre redes de Toda y sucesiones de polinomios dados por recuurencias a tres término