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Disponibilidade de formas de fósforo do solo às plantas
(Universidade Federal de Santa Maria, 2003-02-27)
The soil phosphorus availability depends on a dynamic process and it involves its different forms in the soil. The bond energy of phosphorus and its ligants drives the desorption phenomenon and lability of the different ...
Efeito das flutuações na espessura do isolante sobre o tunelamento em junções de A1/A10x/A1
(Universidade Federal de Santa Maria, 2003-12-23)
Unable to insert abstract.
Estudo dos constituintes quimicos isolados de plantas medicinais da região do vale do Purus no Acre (Amazônia)
(Universidade Federal de Santa Maria, 2003-12-19)
The present work describes especially the extraction, isolation and identification of the chemical compounds of the tuber of Humirianthera ampla Miers (Icacynaceae) and the barks of the Himatanthus sucuuba Spruce (Apocynaceae). ...
O papel da competição por luz e da troca de nutrientes na interação entre plantas
(Universidade Federal de Santa Maria, 2003-12-03)
At this work we present two models to describe de growth dynamics of interacting plants. The first system that we have used describes de water dynamics, and then relates it with the cations in the ground and with the biomass ...
Síntese, estrutura e propriedades de complexos de Cu(II) e Tl(I) com ligantes triazenos monocatenados
(Universidade Federal de Santa Maria, 2003-12-18)
In this work we synthesized and determinate the crystalline/ molecular structure of
three Cu(II) complexes and one Tl(I) complex, all of them showing monocatenated triazenide ligands
previously deprotonated. We present ...
Proposta, análise e implementação de técnicas de comutação sob tensão nula aplicadas a fontes cc-cc isoladas para telecomunicações
(Universidade Federal de Santa Maria, 2003-08-13)
Dc-dc isolated converters with Zero-Voltage-Switching are proposed and studied in this
thesis. Special attention is focused on converters with series switches connections, which
allow the use of switches designed for ...
Reações de 3-trialoacetil-4,5-diidrofuranos e 5-trialoacetil-3,4-diidro-2H-piranos com aminas e álcoois
(Universidade Federal de Santa Maria, 2003-03-21)
This work presents the synthesis of α-alkylaminomethylene-γ-
lactones 8 (one pot reaction) and α-alkylaminomethylene-δ-lactones 9 (two steps
reaction), from the reaction of 3-trichloroacetyl-4,5-dihydrofuran (3) and ...
Controle adaptativo robusto de tempo discreto por modelo de referência e controle repetitivo
(Universidade Federal de Santa Maria, 2003-07-18)
This work is motivated by the recent advances in the electrical-electronics and in
process control field, that extensively use microprocessing systems and require apropriated
good performance control techniques with the ...
Aplicação de carbocátions calcogênio estabilizados na síntese de 1,2,3,4-tetraidroisoquinolinas funcionalizadas
(Universidade Federal de Santa Maria, 2003-04-15)
Unable to insert abstract.
Síntese de sulfetos e dissulfetos aziridínicos quirais e aplicação em catálise assimétrica
(Universidade Federal de Santa Maria, 2003-03-12)
Unable to insert abstract.