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Natural selection: Fair weather cooperators
Current Biology, 2022An impressive long-term study of Greater Ani birds reveals fluctuating selection for group size. In wet years, with abundant food, larger groups enjoy greater protection from predators. In dry years, however, larger groups suffer greater nestling mortality relative to smaller groups.
Andrew G, Zink, Bruce E, Lyon
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Science of the Total Environment, 2020
This paper presents the heavy metal content in river water, sediment and bedrock in the karst area of the Pearl River Basin in China to evaluate the long-term impact of natural weathering and mining on the ecological environment. The results show that Cd
Weihua Wu, S. Qu, W. Nel, J. Ji
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This paper presents the heavy metal content in river water, sediment and bedrock in the karst area of the Pearl River Basin in China to evaluate the long-term impact of natural weathering and mining on the ecological environment. The results show that Cd
Weihua Wu, S. Qu, W. Nel, J. Ji
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Characterization of Naturally Weathered Polypropylene Plates
Journal of Macromolecular Science, Part A, 2006The natural outdoor ageing of thick plates of isotactic polypropylene is investigated. Different techniques (infrared spectroscopy, thermal analysis, scanning electron microscopy, and mechanical tests) are used in order to obtain a comprehensive view of the modifications occurring during the environmental ageing.
R. Gallo +3 more
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Fuel, 1984
Abstract The effects of weathering on the mean maximum vitrinite reflectance, moisture content, and low-temperature ash mineralogy of the low volatile bituminous, Lower Mississippian Price Formation coals of southwest Virginia were determined on samples from depth profiles of three weathered coal beds.
Gayle R. Ingram, J.Donald Rimstidt
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Abstract The effects of weathering on the mean maximum vitrinite reflectance, moisture content, and low-temperature ash mineralogy of the low volatile bituminous, Lower Mississippian Price Formation coals of southwest Virginia were determined on samples from depth profiles of three weathered coal beds.
Gayle R. Ingram, J.Donald Rimstidt
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Cement and Concrete Composites, 2017
C. Hung, Yen-Fang Su, Hsuan-Hui Hung
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C. Hung, Yen-Fang Su, Hsuan-Hui Hung
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Natural weathering of sixteen wood species: Changes on surface properties
, 2020In this study, natural weathering behavior of sixteen different wood species was investigated under the same conditions in order to clarify the resistance against outdoor degrading agents regarding wood color, gloss, surface roughness and surface ...
S. S. Arpaci +3 more
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Rheological and structural evolution of SBS modified asphalts under natural weathering
Fuel, 2016Xinyu Zhao +3 more
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1972
The final test of a paint is its performance under actual conditions of use. For exterior paints, this means on the walls of buildings, railway cars, highway vehicles, ships, and the like. Such tests are expensive and time consuming. Hence, there has developed the practice of conducting tests on a small scale. These screening tests allow studies of the
NB Garlock, GG Sward
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The final test of a paint is its performance under actual conditions of use. For exterior paints, this means on the walls of buildings, railway cars, highway vehicles, ships, and the like. Such tests are expensive and time consuming. Hence, there has developed the practice of conducting tests on a small scale. These screening tests allow studies of the
NB Garlock, GG Sward
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Composites Part B: Engineering, 2019
The Babool, Sheesham, Mango, and Mahogany trees are commonly found in India. The wood-plastic composites (WPCs) were prepared by injection molding using wood dust of the selected Indian trees as the reinforcements in the polypropylene matrix.
A. Vedrtnam, Sawan Kumar, S. Chaturvedi
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The Babool, Sheesham, Mango, and Mahogany trees are commonly found in India. The wood-plastic composites (WPCs) were prepared by injection molding using wood dust of the selected Indian trees as the reinforcements in the polypropylene matrix.
A. Vedrtnam, Sawan Kumar, S. Chaturvedi
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Weathering and weathering rates of natural stone
Environmental Geology and Water Sciences, 1987Physical and chemical weathering were studied as separate processes in the past. Recent research, however, shows that most processes are physicochemical in nature. The rates at which calcite and silica weather by dissolution are dependent on the regional and local climatic environment.
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