Produção orgânica de cenoura com compostos orgânicos elaborados por leira estática aerada.

Esse trabalho objetivou avaliar fitotecnicamente compostos orgânicos enriquecidos em N, P e k obtidos pela leira estática aerada ao longo do processo de compostagem. Foram realizadas seis amostragens, a cada quinze dias, durante a compostagem.CD-ROM. Suplemento. Trabalho apresentado no 51. Congresso Brasileiro de Olericultura, Viçosa, MG

Cultivares e adubação de pimentão para cultivo orgânico de inverno no cerrado.

Suplemento. Trabalho apresentado no Congresso Brasileiro de Olericultura, 50., 2010, Guarapari. Cinquenta anos contribuindo para a saúde da população brasileira. Trabalho A2886-T4488

Composto orgânico enriquecido em nitrogênio e fósforo.

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Efeito residual da adubação com compostos orgânicos enriquecidos em nutrientes e com diferentes graus de decomposição no cultivo da alface em sistema orgânico.

Suplemento. Trabalho apresentado no Congresso Brasileiro de Olericultura, 50., 2010, Guarapari. Cinquenta anos contribuindo para a saúde da população brasileira. Trabalho A2886-T4963

A network description of the non-Gaussian stress-optic and Raman scattering responses of elastomer networks

The ability to measure orientation in dual or multi-phase materials is of current relevance in the study conthe constitution and deformation characteristics of the separate phases in many technologically important polymeric systems. Raman spectroscopy is a very useful tool in this regard because separation of the scattered Raman intensities by phase is possible and because it can be used accurately on thick specimens. A three dimensional network model concept used previously to describe the stress and birefringence reponses of elastomers is extended to describe the components of the Raman tensor for amorphous elastomers under general finite deformations. The utility of the model is verified via its ability to predict the finite deformation responses of elastomeric networks under large shear deformations. Polydimethylsiloxane (PDMS) networks are tested to large deformations in uniaxial compression and in shear for comparison with the theory. Simultaneous displacement, load and optical retardation data are collected using apparatus specially designed to allow optical access throughout the deformation tests. The importance of properly accounting for finite rotations when relating the computational results to the experimentally measured optical data is discussed. The proposed network description of the Raman tensor is also compared to Raman intensity in the literature on polyethylene terephthalate (PET). The results indicate that the theory accurately predicts the anisotropic Raman tensor components over the full range of deformation for which data are available.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/41702/1/707_2005_Article_BF01170305.pd

Polarized raman analysis of polymer chain orientation in ultrafine individual nanofibers with variable low crystallinity

Recent mechanical studies of ultrafine electrospun polymer nanofibers showed they can simultaneously possess high strength and toughness attributed to high degree of chain alignment coupled with low crystallinity. Quantitative analysis of macromolecular alignment in nanofibers is needed for better understanding of processing/structure/properties relationships and optimization. However, quantification of structural features in nanofibers with ultrafine diameters and low variable crystallinity is highly challenging. Here, we show that application of standard orientation analysis protocols developed for polarized Raman microscopy of bulk polymers and films can lead to severe errors in subwavelength diameter samples. A modified polarized Raman method is proposed and implemented for study of size-dependent orientation in individual nanofibers as small as 140 nm. Macromolecular alignment improved significantly with the reduction of nanofiber diameter, correlating with nanofiber modulus increase. Applicability of the proposed method for quantitative comparative studies of nanofiber systems fabricated from solutions with different solvents is demonstrated

Preparation and characterization of bismuth germanium oxide (BGO) polymer composites

Bismuth germanium oxide Bi12GeO20 (BGO) has very interesting electrical, optical and magnetic properties. In order to make devices based on this material more flexible, its powder was used for preparing polymer composites. This study reports investigation of the effects of using different solvents and polymers in preparation of BGO composite on the microstructural and optical behaviour of the resulting material. Preparation of such composites by a solution casting method is described. Poly (methyl methacrylate) (PMMA) and polystyrene (PS)) were used as matrix materials and acetone and chloroform as solvents. Their microstructure and the quality of BGO dispersion and deaggregation in polymer matrix were analyzed by SEM, Raman, XRD and optical spectroscopy. The influence of particle size distribution, their shapes, and concentration on the optical transmission is calculated based on Mie scattering theory and discussed, too