为进一步提高沥青路面的路用性能,提出将多孔中空二氧化硅纳米颗粒(MHSN)作为沥青烟的吸附剂,掺入沥青混合料中,测定改性沥青的路用性能。通过扫描电子显微镜(scanning electron microscope,SEM)、透射电子显微镜(transmission electron...为进一步提高沥青路面的路用性能,提出将多孔中空二氧化硅纳米颗粒(MHSN)作为沥青烟的吸附剂,掺入沥青混合料中,测定改性沥青的路用性能。通过扫描电子显微镜(scanning electron microscope,SEM)、透射电子显微镜(transmission electron microscope,TEM)和BET(Brunauer-Emmett-Teller)等测试手段对水热法制备的纳米MHSN进行表征,并测定MHSN改性沥青的流变性能和VOC的排放量。结果表明:MHSN表面的孔径大部分连续分布在0~50 nm;MHSN的掺入降低了沥青的针入度和提高了软化点,提高了沥青的复合剪切模量,使沥青的相位角略有减小,可以提高沥青混合料的高温抗车辙性能;MHSN的掺入可以显著降低沥青VOC的总排放量,对沥青VOC中各组分的排放有不同程度的抑制作用。由此可见,纳米MHSN掺量的沥青混合料路用性能表现优越,可用于道路施工中,并且经济效益和社会效益明显。展开更多
A one-year field study was conducted to determine the conversion ratio of phytoplankton biomass carbon （Phyto-C） to chlorophyll-a （Chl-a） in Jiaozhou Bay, China. We measured suspended particulate organic carbon （...A one-year field study was conducted to determine the conversion ratio of phytoplankton biomass carbon （Phyto-C） to chlorophyll-a （Chl-a） in Jiaozhou Bay, China. We measured suspended particulate organic carbon （POC） and phytoplankton Chl-a samples collected in surface water monthly from March 2005 to February 2006. The temporal and spatial variations of Chl-a and POC concentrations were observed in the bay. Based on the field measurements, a linear regression model Ⅱwas used to generate the conversion ratio of Phyto-C to Chl-a. In most cases, a good linear correlation was found between the observed POC and Chl-a concentrations, and the calculated conversion ratios ranged from 26 to 250 with a mean value of 56 μg ·μl^-1. The conversion ratio in the fall was higher than that in the winter and spring months, and had the lowest values in the summer. The ratios also exhibited spatial variations, generally with low values in the near shore regions and relatively high values in offshore waters. Our study suggests that temperature was likely to be the main factor influencing the observed seasonal variations of conversion ratios while nutrient supply and light penetration played important roles in controlling the spatial variations.展开更多
O625.463 2000064039蒽醌衍生物在不同酸度溶液中的吸收光谱=Effect ofacidity on absopion spectra of anthraquinonederivatives[刊,中]/丁世岭,沈淑引,熊国祥,周庆复(中科院感光化学所.北京(100101))//感光科学与光化学.—1999,17(4)...O625.463 2000064039蒽醌衍生物在不同酸度溶液中的吸收光谱=Effect ofacidity on absopion spectra of anthraquinonederivatives[刊,中]/丁世岭,沈淑引,熊国祥,周庆复(中科院感光化学所.北京(100101))//感光科学与光化学.—1999,17(4).—343-346设计合成了两种新的蒽醌类化合物,测试它们在溶液中的吸收光谱。展开更多
文摘为进一步提高沥青路面的路用性能,提出将多孔中空二氧化硅纳米颗粒(MHSN)作为沥青烟的吸附剂,掺入沥青混合料中,测定改性沥青的路用性能。通过扫描电子显微镜(scanning electron microscope,SEM)、透射电子显微镜(transmission electron microscope,TEM)和BET(Brunauer-Emmett-Teller)等测试手段对水热法制备的纳米MHSN进行表征,并测定MHSN改性沥青的流变性能和VOC的排放量。结果表明:MHSN表面的孔径大部分连续分布在0~50 nm;MHSN的掺入降低了沥青的针入度和提高了软化点,提高了沥青的复合剪切模量,使沥青的相位角略有减小,可以提高沥青混合料的高温抗车辙性能;MHSN的掺入可以显著降低沥青VOC的总排放量,对沥青VOC中各组分的排放有不同程度的抑制作用。由此可见,纳米MHSN掺量的沥青混合料路用性能表现优越,可用于道路施工中,并且经济效益和社会效益明显。
基金Supported by the Knowledge Innovation Project of Chinese Academy of Sciences (Nos.KZCX3-SW-214KZCX-YW-213-3)
文摘A one-year field study was conducted to determine the conversion ratio of phytoplankton biomass carbon （Phyto-C） to chlorophyll-a （Chl-a） in Jiaozhou Bay, China. We measured suspended particulate organic carbon （POC） and phytoplankton Chl-a samples collected in surface water monthly from March 2005 to February 2006. The temporal and spatial variations of Chl-a and POC concentrations were observed in the bay. Based on the field measurements, a linear regression model Ⅱwas used to generate the conversion ratio of Phyto-C to Chl-a. In most cases, a good linear correlation was found between the observed POC and Chl-a concentrations, and the calculated conversion ratios ranged from 26 to 250 with a mean value of 56 μg ·μl^-1. The conversion ratio in the fall was higher than that in the winter and spring months, and had the lowest values in the summer. The ratios also exhibited spatial variations, generally with low values in the near shore regions and relatively high values in offshore waters. Our study suggests that temperature was likely to be the main factor influencing the observed seasonal variations of conversion ratios while nutrient supply and light penetration played important roles in controlling the spatial variations.
文摘O625.463 2000064039蒽醌衍生物在不同酸度溶液中的吸收光谱=Effect ofacidity on absopion spectra of anthraquinonederivatives[刊,中]/丁世岭,沈淑引,熊国祥,周庆复(中科院感光化学所.北京(100101))//感光科学与光化学.—1999,17(4).—343-346设计合成了两种新的蒽醌类化合物,测试它们在溶液中的吸收光谱。
