نتایج جستجو برای: ice nucleating agents
تعداد نتایج: 414330 فیلتر نتایج به سال:
The initiation of ice in an isolated orographic wave cloud was compared with expectations based on ice nucleating aerosol concentrations and with predictions from new ice nucleation parameterizations applied in a cloud parcel model. Measurements of ice crystal number concentrations were found to be in good agreement both with measured number concentrations of ice nuclei feeding the clouds and w...
Abstract. Large amounts of dust aerosols are lifted to the upper troposphere every year and play a major role in cirrus formation by acting as efficient ice nuclei. However, relative importance heterogeneous nucleation spontaneous homogenous dust-related clouds is still not well evaluated globally. Here, based on spaceborne observations, we propose method identify two ice-nucleating regimes clo...
The formation of ice particles in the Earth’s atmosphere strongly affects the properties of clouds and their impact on climate. Despite the importance of ice formation in determining the properties of clouds, the Intergovernmental Panel on Climate Change (IPCC, 2007) was unable to assess the impact of atmospheric ice formation in their most recent report because our basic knowledge is insuffici...
The formation of ice particles in the Earth's atmosphere strongly affects the properties of clouds and their impact on climate. Despite the importance of ice formation in determining the properties of clouds, the Intergovernmental Panel on Climate Change (IPCC, 2007) was unable to assess the impact of atmospheric ice formation in their most recent report because our basic knowledge is insuffici...
Biological ice nucleators (IN) function as catalysts for freezing at relatively warm temperatures (warmer than -10 degrees C). We examined the concentration (per volume of liquid) and nature of IN in precipitation collected from Montana and Louisiana, the Alps and Pyrenees (France), Ross Island (Antarctica), and Yukon (Canada). The temperature of detectable ice-nucleating activity for more than...
Ice nucleating particles (INP) active at a few degrees below 0°C are produced by a range of organisms and released into the environment. They may affect cloud properties and precipitation when becoming airborne. So far, our knowledge about sources of biological INP is based on grab samples of vegetation, soil or water studied in the laboratory. By combining measurements of INP concentrations in...
Controlling the solid-state morphology of semiconducting polymers is crucial for function and performance optoelectronic photonic devices. Nucleation a commonly used straightforward approach to tailor semi-crystalline polymers. However, efficient nucleating agents are still rare. Here, we present conceptual supramolecular polymer, poly(3-hexylthiophene) (P3HT). Using this approach, developed cl...
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