搜索结果: 1-15 共查到“理学 CCN”相关记录52条 . 查询时间(0.064 秒)
CCN中基于节点状态模型的缓存污染攻击检测算法
内容中心网络 缓存污染攻击 缓存状态模型 攻击检测
2016/12/3
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。
Adaptive method of lines for multi-component aerosol condensational growth and CCN activation
Adaptive method of lines multicomponent aerosol condensational growth CCN activation
2014/12/9
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 ...
环北京春季大气气溶胶分布、来源及其与CCN转化关系的飞机探测
气溶胶 CCN 飞机观测 粒子谱
2013/8/19
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...
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 ...
Hygroscopicity distribution concept for measurement data analysis and modeling of aerosol particle mixing state with regard to hygroscopic growth and CCN activation
Hygroscopicity distribution concept measurement data analysis aerosol particle mixing state hygroscopic growth CCN activation
2010/8/16
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...
The contribution of anthropogenic aerosols to aerosol light-scattering and CCN activity in the California coastal zone
anthropogenic aerosols aerosol light-scattering CCN activity the California coastal zone
2010/8/16
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...
The importance of aerosol mixing state and size-resolved composition on CCN concentration and the variation of the importance with atmospheric aging of aerosols
aerosol mixing state size-resolved composition CCN concentration atmospheric aerosols
2010/8/16
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...
Empirical estimates of CCN from aerosol optical properties at four remote sites
Empirical estimates CCN aerosol optical properties four remote sites
2010/8/16
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...
Global distribution of the effective aerosol hygroscopicity parameter for CCN activation
Global distribution the effective aerosol hygroscopicity parameter CCN activation
2010/8/13
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...
CCN predictions using simplified assumptions of organic aerosol composition and mixing state: a synthesis from six different locations
CCN predictions organic aerosol composition a synthesis six different locations
2010/8/13
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...
Towards closing the gap between hygroscopic growth and CCN activation for secondary organic aerosols – Part 3: Influence of the chemical composition on the hygroscopic properties and volatile fractions of aerosols
hygroscopic growth CCN activation secondary organic aerosols the chemical composition the hygroscopic properties aerosols
2010/8/12
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...
Cloud condensation nuclei in polluted air and biomass burning smoke near the mega-city Guangzhou, China – Part 1: Size-resolved measurements and implications for the modeling of aerosol particle hygroscopicity and CCN activity
Cloud condensation nuclei polluted air and biomass Size-resolved measurements and implications aerosol particle hygroscopicity CCN activity
2010/8/12
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...
Consistency between parameterisations of aerosol hygroscopicity and CCN activity during the RHaMBLe discovery cruise
aerosol hygroscopicity CCN activity
2010/8/12
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 ...
Comprehensively accounting for the effect of giant CCN in cloud activation parameterizations
Comprehensively accounting effect giant CCN cloud activation parameterizations
2010/3/16
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...
Water-soluble SOA from Alkene ozonolysis: composition and droplet activation kinetics inferences from analysis of CCN activity
Water-soluble SOA droplet activation kinetics inferences CCN activity
2010/2/21
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...