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搜索结果: 1-15 共查到理学 CCN相关记录52条 . 查询时间(0.062 秒)
针对内容中心网络中的缓存污染攻击问题,以污染内容数量、分布状态和攻击强度3个参数对缓存污染攻击进行定量描述和分析,建立了攻击下的节点缓存状态模型。通过分析节点关键参数的变化,提出了基于节点状态模型的攻击检测原则,并分别以单位时间缓存替换率和请求达到率为观测参数进行算法实例化设计。仿真结果与性能分析表明,所提检测算法在应对分散式攻击与集中式攻击时,可以取得良好的检测性能。
The process of formation of cloud droplets on an ensemble of aerosol particles is modelled by numerous investigators using the method of lines (MOL). The method involves discretisation of the aerosol ...
利用2009年春季开展的“环北京云观测试验”(Beijing cloud experiment, BCE)观测的气溶胶和云凝结核(CCN)数据, 研究了试验期间大气气溶胶的分布、来源特征及其与云凝结核(CCN)的转化关系. 结果表明, 高浓度气溶胶基本分布在4500 m以下的区域, 量级可以达到103 个/cm3. 4500 m以上气溶胶呈显著下降趋势, 仅为101 个/cm3的量级; 气溶胶平均...
An Arctic CCN-limited cloud-aerosol regime     airborne aerosol particles  the Earth's surface       font style='font-size:12px;'> 2011/1/19
On average, airborne aerosol particles cool the Earth's surface directly by absorbing and scattering sunlight and indirectly by influencing cloud reflectivity, life time, thickness or extent. Here we ...
This paper presents a general concept and mathematical framework of particle hygroscopicity distribution for the analysis and modeling of aerosol hygroscopic growth and cloud condensation nucleus (CCN...
Aircraft-based measurements of aerosol light-scattering coefficient, cloud condensation nuclei (CCN) measured directly or by proxy, and aerosol chemical composition are reported for three different ye...
Aerosol microphysics, chemical composition, and CCN concentrations were measured at the T0 urban supersite in Mexico City during Megacity Initiative: Local and Global Research Observations (MILAGRO) i...
This study presents an empirical method to estimate the CCN concentration as a function of percent supersaturation. The aerosol optical properties, backscatter fraction and single scatter albedo, func...
In this study we use the ECHAM/MESSy Atmospheric Chemistry (EMAC) model to simulate global fields of the effective hygroscopicity parameter κ which approximately describes the influence of chemical co...
An accurate but simple quantification of the fraction of aerosol particles that can act as cloud condensation nuclei (CCN) is needed for implementation in large-scale models. Data on aerosol size dist...
The influence of varying levels of water mixing ratio, r, during the formation of secondary organic aerosol (SOA) from the ozonolysis of α-pinene on the SOA hygroscopicity and volatility was investiga...
Atmospheric aerosol particles serving as Cloud Condensation Nuclei (CCN) are key elements of the hydrological cycle and climate. We measured and characterized CCN in polluted air and biomass burning s...
Results from a measurement study performed in the Tropical Atlantic on board the RHaMBLe Discovery Cruise D319 are presented. Measurements of aerosol composition, hygroscopicity and CCN activity were ...
Large cloud condensation nuclei (CCN) (e.g., aged dust particles and seasalt) cannot attain their equilibrium size during the typical timescale of cloud droplet activation. Cloud activation parameteri...
Cloud formation characteristics of the water-soluble organic fraction (WSOC) of secondary organic aerosol (SOA) formed from the ozonolysis of alkene hydrocarbons (terpinolene, 1-methlycycloheptene and...

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