154 research outputs found

    Topography of inland deltas: Observations, modeling, and experiments

    Get PDF
    The topography of inland deltas is influenced by the water-sediment balance in distributary channels and local evaporation and seepage rates. In this letter a reduced complexity model is applied to simulate inland delta formation, and results are compared with the Okavango Delta, Botswana and with a laboratory experiment. We show that water loss in inland deltas produces fundamentally different dynamics of water and sediment transport than coastal deltas, especially deposition associated with expansion-contraction dynamics at the channel head. These dynamics lead to a systematic decrease in the mean topographic slope of the inland delta with distance from the apex following a power law with exponent alpha = -0.69 +/- 0.02 where the data for both simulation and experiment can be collapsed onto a single curve. In coastal deltas, on the contrary, the slope increases toward the end of the deposition zone.This work was funded by the Swiss National Foundation grant NF20021-116050/1. The author D. A. was affiliated to the Institute of Geodesy and Photogrammetry of ETH Zurich when performing the project. J. S. A. J would like to thank the Brazilian agencies CNPq, CAPES and FUNCAP for financial support.Publisher's Versio

    Recomendações de híbridos de milho para a zona agreste do nordeste brasileiro: ensaios realizados no ano agrícola de 2006.

    Get PDF
    O trabalho objetiva conhecer o desempenho produtivo de diversos híbridos de milho quando submetidos a diferentes condições ambientais do agreste nordestino, de modo a recomendar, com maior segurança, materiais com melhor adaptação aos diferentes sitemas de produção da região.bitstream/CPATC/19579/1/cot-64.pdfISSN 1678-1937

    Avaliação e seleção de variedades de mandioca com a participação de agricultores do Semi-Árido do Nordeste brasileiro.

    Get PDF
    Este trabalho teve por objetivos avaliar e selecionar variedades de mandioca com a participação de agricultores do Semi-árido do Nordeste brasileiro. Foi utilizada a metodologia de pesquisa participativa a qual se fudamenta na maior integração entre pesquisadores, extencionista e agricultores na seleção de novas variedades de mandioca. No trabalho, realizado no período de 1996 a 1998, foram estabelecidas trinta e uma provas participativas em propriedades de agricultores localizados no Semi-árido dos estados do Ceará, Pernembuco, Bahia e Sergipe. Em cada prova foram plantados nove clones melhorados mais a variedade local. Cada prova foi composta de 50 plantas por clone, sem repetição, utilizando-se o manejo tradicional do agricultor. Foram feitas análises de preferência através do uso de matrizes e de curvas de regressão e análises de estabilidade de produção. Indentificou-se os principais critérios de seleção de variedades de mandioca utilizados pelos agricultores. Algumas variedades apresentaram alta probabilidade de aceitação pelos agricultores. Concluiu-se que a participação dos agricultores na avaliação e seleção das variedades de mandioca geradas pela pesquisa é fundamental para se agilizar o processo de difusão e adoção das novas variedades melhoradas.bitstream/item/81385/1/Avaliacao-e-selecao-de-variedadesWania-Fukuda-Boletim-pesquisa-18-2000.pdfMemória

    Factors associated with inflamm-aging in institutionalized older people

    Get PDF
    The increase in inflammatory cytokines associated with a reduction in the bioavailability of zinc has been used as a marker for inflammation. Despite the high inflammatory state found in institutionalized older individuals, few studies have proposed verifying the factors associated with this condition in this population. To verify the factors associated with inflamm-aging in institutionalized older people. A total of 178 older people (≥ 60 years old) living in nursing homes in Natal/RN were included in the study. Cluster analysis was used to identify three groups according to their inflammatory state. Analysis anthropometric, biochemical, sociodemographic, and health-related variables was carried out. In sequence, an ordinal logistic regression was performed for a confidence level of 95% in those variables with p < 0.20 in the bivariate analysis. IL-6, TNF-α, zinc, low-density lipids (LDL), high-density lipids (HDL), and triglycerides were associated with inflamm-aging. The increase of 1 unit of measurement of LDL, HDL, and triglycerides increased the chance of inflammation-aging by 1.5%, 4.1%, and 0.9%, respectively, while the oldest old (≥ 80 years old) had an 84.9% chance of presenting inflamm-aging in relation to non-long-lived older people (< 80 years). The association between biochemical markers and inflamm-aging demonstrates a relationship between endothelial injury and the inflammatory state. In addition, the presence of a greater amount of fat in the blood may present a higher relative risk of death
    corecore