Small range 文档类型:"3"

Totally found 62 items.

  • [期刊] Atmospheric histories, growth rates and solubilities in seawater and other natural waters of the potential transient tracers HCFC-22, HCFC-141b, HCFC-142b, HFC-134a, HFC-125, HFC-23, PFC-14 and PFC-116
    We present consistent annual mean atmospheric histories and growth rates for the mainly anthropogenic halogenated compounds HCFC-22, HCFC-141b, HCFC-142b, HFC-134a, HFC-125, HFC-23, PFC-14 and PFC-116, which are all potentially useful oceanic transient tracers (tracers of water transport within the ocean), for the Northern and Southern Hemisphere with the aim of providing input histories of these compounds for the equilibrium between the atmosphere and surface ocean. We use observations of these halogenated compounds made by the Advanced Global Atmospheric Gases Experiment (AGAGE), the Scripps Institution of Oceanography (SIO), the Commonwealth Scientific and Industrial Research Organization (CSIRO), the National Oceanic and Atmospheric Administration (NOAA) and the University of East Anglia (UEA). Prior to the direct observational record, we use archived air measurements, firn air measurements and published model calculations to estimate the atmospheric mole fraction histories. The results show that the atmospheric mole fractions for each species, except HCFC-14 lb and HCFC-142b, have been increasing since they were initially produced. Recently, the atmospheric growth rates have been decreasing for the HCFCs (HCFC-22, HCFC-141b and HCFC-142b), increasing for the HFCs (HFC-134a, HFC-125, HFC-23) and stable with little fluctuation for the PFCs (PFC-14 and PFC-116) investigated here. The atmospheric histories (source functions) and natural background mole fractions show that HCFC-22, HCFC-141b, HCFC-142b, HFC-134a, HFC-125 and HFC-23 have the potential to be oceanic transient tracers for the next few decades only because of the recently imposed bans on production and consumption. When the atmospheric histories of the compounds are not monotonically changing, the equilibrium atmospheric mole fraction (and ultimately the age associated with that mole fraction) calculated from their concentration in the ocean is not unique, reducing their potential as transient tracers.
  • [期刊] 中国聚氨酯工业协会第13次年会论文集——低成本HCFC-141b型聚氨酯硬泡组合料的研制
    研制了具有良好流动性的HCFC-l41b作为发泡剂的聚氨酯硬泡组合料。对制备低成本HCFC-l41b聚氨酯组合聚醚中影响发泡性能的有关因素进行了探讨。以此制备的硬质泡沫塑料具有良好的流动性和尺寸稳定性、较低的配方成本,达到了电热水器、太阳能热水器、冰箱冰柜、管道及夹芯板等产品使用的要求。
  • [期刊] HCFC-141b阻燃组合聚醚的研制
  • [期刊] 用于HCFC-141b发泡的聚醚的合成
    介绍了一种用于HCFC-141b发泡的聚醚多元醇的制备方法,对影响聚醚质量的因素进行了讨论,结果表明,以该聚醚为多元醇原料、HCFC-141b为发泡剂制备的聚氨酯硬泡,其性能与CFC-11发泡剂制备的泡沫相近.
  • [期刊] LaRoche idles HCFC-141b plant
    focus on solvents; N.11 2000; 5
  • [期刊] HCFC-141b的研究与开发
  • [期刊] HCFC-141b型组合聚醚发泡绝热材料
    本文简述了聚氨酯泡沫行业无氟替代进展,介绍了采用HCFC-141b型组合聚醚的优点及其物理化学性能,同时论述了太阳热水器行业使用该组合聚醚建议的发泡工艺条件。采用HCFC-141b型组合聚醚完全可以适用太阳热水器生产。
  • [期刊] HCFC-141b阻燃组合聚醚的研制
  • [期刊] 中国聚氨酯工业协会第13次年会论文集——低成本HCFC-141b型聚氨酯硬泡组合料的研制
    研制了具有良好流动性的HCFC-l41b作为发泡剂的聚氨酯硬泡组合料。对制备低成本HCFC-l41b聚氨酯组合聚醚中影响发泡性能的有关因素进行了探讨。以此制备的硬质泡沫塑料具有良好的流动性和尺寸稳定性、较低的配方成本,达到了电热水器、太阳能热水器、冰箱冰柜、管道及夹芯板等产品使用的要求。
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