The (1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetra-decane)nickel(I), [Ni(tmc)]+, electrogenerated at glassy carbon cathodes is shown to be an effective catalyst for the intramolecular radical-type cyclisation of bromoalkoxylated derivatives 1 in alcohol and / or alcohol/water mixtures as well as in microemulsions made with cationic and anionic surfactants. The results obtained indicate that the reaction pro...
Este trabalho tem o propósito de estudar composições e aplicações de pigmentos de Minas Gerais. Foi realizado um estudo qualitativo e quantitativo de pigmentos naturais coletados na região de Itabirito. As amostras foram denominadas segundo o Sistema Munsell de Cores e apresentaram composições variadas. Os minerais identificados por difração de raios X e confirmados por microscopia eletrônica de varredura (MEV)...
We investigate the spectrum of small amplitude oscillations of the sine-Gordon vortex-antivortex pair in layered ferromagnetic systems described by the anisotropic three-dimensional XY-model. In the case of a small interlayer coupling constant, vortex-pairs can be formed independently in each plane. Analytical expressions for two discrete modes with zero frequency are obtained. These zero modes are associated w...
Propõem-se como objetivos deste trabalho: Calibrar o modelo CROPGRO - Dry Bean para a cultivar Carioca, em Santo Antônio de Goiás, GO; Testar a performance do modelo calibrado para estimar a produtividade e o desenvolvimento do feijoeiro; Testar o modelo calibrado para a região de Planaltina, DF, utilizando a cultivar Carioca, a fim de comparar as produtividades observadas em campo com aquelas simuladas. ; 2001
The objective of this work was to compare the values of milk somatic cell counts (SCC) using the Somacount 300, and two detergents for sample preparation. The equipment was calibrated using the detergent RBS 35. Forty independent milk samples were analyzed. Each sample was randomly divided into two subsamples, and each subsample was analyzed after preparation with either RBS 35 or Extram MA 01 Alkaline detergen...
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