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Seasonal Quality Assessment of Agricultural Soils along the Bank of Tungan Kawo Dam, Kontagora, Nigeria

Journal of Agricultural Chemistry and Environment 2016年第3期5卷 132-151页

作者： Musa Sabo Abdullahi Adamu Uzairu oluwole joshua okunola Muhammad Lawal Balarabe Department of Chemistry Ahmadu Bello University Zaria Nigeria Department of Applied Chemistry Federal University Dutsin-Ma Nigeria Department of Biological Sciences Ahmadu Bello University Zaria Nigeria

This research work studies the impacts of irrigation and other agricultural practices on the soil along the bank of Tungan Kawo dam. The experimental analysis evaluates the soil physicochemical parameters and metal (Cd, Cu, Cr, Ni, Fe, Mn, Pb and Zn) concentrations using sequential extractions. The physicochemical parameters of the soils across the sites indicated values reported for less polluted soils. Also, analysis of total metals in the soils indicated lower concentration of all metals evaluated than recommended standard limits with exception of Cd. The results of sequen tial extraction of heavy metal in soil sample indicated that all metals were mainly associated with the residual, Fe-MnO and organic bound fractions. The residual fraction has the maximum concentration of metals especially in cool and dry season for Cr, Cu, Ni, Pb and Zn, whereas only a small fraction of all the heavy metal is extracted in water soluble, exchangeable and carbonate bound fractions. It indicates that the bioavailability index is low. Hence, mobility of the heavy metals by the surrounding plants grown on the soils is low.

关键词： Metals Soils Sequential Contamination

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Finite Element Modeling Of Low Heat Conducting Building Bricks

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Journal of Minerals and Materials Characterization and Engineering 2012年第8期11卷 800-806页

作者： O. O. oluwole J. S. joshua H. O. Nwagwo Department Of Mechanical Engineering University Of Ibadan Nigeria

Heat conduction through conventional and interlocking building bricks with cavities was studied in this work. Heat transfer analysis was carried out using MATLAB? partial differential equation toolbox. Regular and staggered hole arrangements were studied. Results showed that four staggered holed interlocking bricks were effective in thermal resistance into the bricks and increasing the holes beyond four did not give any thermal resistance advantage. For the conventional bricks staggered holes did not give any thermal resistance advantage but the four-holed bricks were also adjudged to be effective in thermal resistance into the brick surface. Increasing the number of holes beyond four in conventional bricks did give some thermal resistivity advantage but very minimal. Structural strengths of holed bricks were not considered in this study.

关键词： Building Bricks Finite Element Modeling Heat Conduction

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