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Jonatas S. RomanoMariane S. Miranda Meiri B.R. OliveiraFlávio A. Rodrigues 《Journal of Cleaner Production》2011,19(11):1224-1228
Metals can be stabilized into cement matrix by solidification/stabilization process. Rice hull is an agricultural residue containing about 10-20% (weight) of silica. It can be used to synthesize β-Ca2SiO4, an important component of Portland cement. Furthermore it is possible to prepare β-Ca2SiO4 doped with heavy metals. Here we describe the synthesis of β-Ca2SiO4 doped with zinc and the behavior of mortars prepared using this material. Products were analyzed by X-ray diffraction, differential thermal analysis and scanning electron microscopy coupled to energy-dispersive spectroscopy. The maximum amount of zinc that can be inserted into β-Ca2SiO4, without affecting the crystalline structure, is limited to 2% (molar basis). In comparison with conventional mortars, zinc-modified mortars show a similar behavior, regarding porosity, resistance to acidic attack and compressive strength. The synthesis of β-Ca2SiO4 doped with zinc presents a new possibility for safety enhancement in solidification/stabilization processes. 相似文献
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Delesposte Jamile Eleutério Rangel Luís Alberto Duncan Meiriño Marcelo Jasmim Narcizo Ramon Baptista Alencar Junior André Armando Mendonça de 《The Environmentalist》2021,41(4):501-522
Environment Systems and Decisions - Sustainable innovation has gained prominence in recent years, due to the demands imposed by global competition, social pressures and the needs of consumers and... 相似文献
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Panayiotis Pafilis Shai Meiri Johannes Foufopoulos Efstratios Valakos 《Die Naturwissenschaften》2009,96(9):1107-1113
Resource availability, competition, and predation commonly drive body size evolution. We assess the impact of high food availability
and the consequent increased intraspecific competition, as expressed by tail injuries and cannibalism, on body size in Skyros
wall lizards (Podarcis gaigeae). Lizard populations on islets surrounding Skyros (Aegean Sea) all have fewer predators and competitors than on Skyros but
differ in the numbers of nesting seabirds. We predicted the following: (1) the presence of breeding seabirds (providing nutrients)
will increase lizard population densities; (2) dense lizard populations will experience stronger intraspecific competition;
and (3) such aggression, will be associated with larger average body size. We found a positive correlation between seabird
and lizard densities. Cannibalism and tail injuries were considerably higher in dense populations. Increases in cannibalism
and tail loss were associated with large body sizes. Adult cannibalism on juveniles may select for rapid growth, fuelled by
high food abundance, setting thus the stage for the evolution of gigantism. 相似文献
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