One quarter scale experiment device of a typical L-shape architecture structure including a burning room and an adjacent hallway is established to carry out the research.The smoke characteristics at the sampling point...One quarter scale experiment device of a typical L-shape architecture structure including a burning room and an adjacent hallway is established to carry out the research.The smoke characteristics at the sampling points below the ceiling of the burning compartment and the roof of the hallway are studied systematically to find out the effects of different ceilings on the local fire origin compartment and the smoke transportation to a remote area.A series of tests is reported and the smoke residence time,the concentration peak and the concentration build up rate are investigated as functions of the type of the ceiling.The smoke residence time,the most important factor concerning smoke toxicity,is described by a novel concept,wavelength,in this study.Furthermore,it is worth emphasizing that the PVC ceiling exhibits a phenomenon of frequent collapse during the fire developing period.The single heat action is conducted to judge the smoke and the heat effect on the fire risk.展开更多
150 pollen samples collected between the years 2009 and 2011 from 30 locations, divided according to agricultural practice were analysed for the presence of pesticides. In 2009, residues were found in pollen samples f...150 pollen samples collected between the years 2009 and 2011 from 30 locations, divided according to agricultural practice were analysed for the presence of pesticides. In 2009, residues were found in pollen samples from twelve locations （40%）, in 2010, in samples from four locations （13.3%） and in 2011, in samples from three locations （10%）. Altogether 15 different residues in pollen were found in 2009, two in year 2010 and five in 2011. Residues found in the pollen samples ranged from 0.001 mg/kg to 76 mg/kg. The highest number （twelve） of residues was found in pollen from the intensive fruit farming locations and from the intensive viticulture locations （eight）. The residues were mostly from the fungicide group （69%）. Insecticide residues （chlorpyrifos-ethyl, methoxyfenozide, thiacloprid） were found in the pollen samples from eight locations. Residues in the pollen did not statistically influence the development of the honeybee colonies or infestation rate of Nosema （Nosema spp.）, or viruses ABPV （acute bee paralysis virus）, SBV （sacbrood virus）, DWV （deformed wing virus）, and BQCV （black queen cell virus））.展开更多
文摘One quarter scale experiment device of a typical L-shape architecture structure including a burning room and an adjacent hallway is established to carry out the research.The smoke characteristics at the sampling points below the ceiling of the burning compartment and the roof of the hallway are studied systematically to find out the effects of different ceilings on the local fire origin compartment and the smoke transportation to a remote area.A series of tests is reported and the smoke residence time,the concentration peak and the concentration build up rate are investigated as functions of the type of the ceiling.The smoke residence time,the most important factor concerning smoke toxicity,is described by a novel concept,wavelength,in this study.Furthermore,it is worth emphasizing that the PVC ceiling exhibits a phenomenon of frequent collapse during the fire developing period.The single heat action is conducted to judge the smoke and the heat effect on the fire risk.
文摘150 pollen samples collected between the years 2009 and 2011 from 30 locations, divided according to agricultural practice were analysed for the presence of pesticides. In 2009, residues were found in pollen samples from twelve locations （40%）, in 2010, in samples from four locations （13.3%） and in 2011, in samples from three locations （10%）. Altogether 15 different residues in pollen were found in 2009, two in year 2010 and five in 2011. Residues found in the pollen samples ranged from 0.001 mg/kg to 76 mg/kg. The highest number （twelve） of residues was found in pollen from the intensive fruit farming locations and from the intensive viticulture locations （eight）. The residues were mostly from the fungicide group （69%）. Insecticide residues （chlorpyrifos-ethyl, methoxyfenozide, thiacloprid） were found in the pollen samples from eight locations. Residues in the pollen did not statistically influence the development of the honeybee colonies or infestation rate of Nosema （Nosema spp.）, or viruses ABPV （acute bee paralysis virus）, SBV （sacbrood virus）, DWV （deformed wing virus）, and BQCV （black queen cell virus））.
