نتایج جستجو برای: soot particle size

تعداد نتایج: 697744  

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2008
Renyi Zhang Alexei F Khalizov Joakim Pagels Dan Zhang Huaxin Xue Peter H McMurry

The atmospheric effects of soot aerosols include interference with radiative transfer, visibility impairment, and alteration of cloud formation and are highly sensitive to the manner by which soot is internally mixed with other aerosol constituents. We present experimental studies to show that soot particles acquire a large mass fraction of sulfuric acid during atmospheric aging, considerably a...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2009
Ryan C Moffet Kimberly A Prather

Our ability to predict how global temperatures will change in the future is currently limited by the large uncertainties associated with aerosols. Soot aerosols represent a major research focus as they influence climate by absorbing incoming solar radiation resulting in a highly uncertain warming effect. The uncertainty stems from the fact that the actual amount soot warms our atmosphere strong...

Journal: :international journal of nanoscience and nanotechnology 2010
m. a. dabbaghian a. a. babalou p. hadi e. jannatdoust

in this study, sio2 nanoparticles were successfully synthesized via sol-gel precipitation method and the effects of different parameters such as temperature, ethanol, ammonia and tetraethylorthosilicate (teos) contents based on water were investigated in a systematic way applying taguchi experimental design method. it was found that, among all the investigated parameters, ethanol as a co-solven...

2015
María Antiñolo Megan D. Willis Shouming Zhou Jonathan P.D. Abbatt

Although it is known that soot particles are emitted in large quantities to the atmosphere, our understanding of their environmental effects is limited by our knowledge of how their composition is subsequently altered through atmospheric processing. Here we present an on-line mass spectrometric study of the changing chemical composition of hydrocarbon soot particles as they are oxidized by gas-...

2015
D. Koch Y. Balkanski S. E. Bauer N. Yan R. C. Easter S. Ferrachat S. J. Ghan C. Hoose T. Iversen A. Kirkevåg J. E. Kristjansson X. Liu U. Lohmann S. Menon J. Quaas M. Schulz Ø. Seland T. Takemura

We use global models to explore the microphysical effects of carbonaceous aerosols on liquid clouds. Although absorption of solar radiation by soot warms the atmosphere, soot may cause climate cooling due to its contribution to cloud condensation nuclei (CCN) and therefore cloud brightness. Six global models conducted three soot experiments; four of the models had detailed aerosol microphysical...

Journal: :Energies 2022

This paper studies the generation process and emission characteristics of soot from Marine diesel engine. On basis Particulate size mimic (PSM) detailed model, parameters related to obtained reaction mechanism calculation 3 surrogate different carbon chain length: n-heptane, n-tetradecane n-tetradecane-toluene were compared analyzed including precursor soot, quality density particle distributio...

2014
Rajan K. Chakrabarty Nicholas D. Beres Hans Moosmüller Swarup China Claudio Mazzoleni Manvendra K. Dubey Li Liu Michael I. Mishchenko

Wildfires contribute significantly to global soot emissions, yet their aerosol formation mechanisms and resulting particle properties are poorly understood and parameterized in climate models. The conventional view holds that soot is formed via the cluster-dilute aggregation mechanism in wildfires and emitted as aggregates with fractal dimension Df ≈ 1.8 mobility diameter Dm ≤ 1 μm, and aerodyn...

Journal: :علوم و تکنولوژی پلیمر 0
محمد دانشگر ابراهیم واشقانی فراهانی مهدی نکومنش حقیقی

in suspension polymerization, particle size distribution of polymer is the outcome of dynamic equilibrium between the break up and coalescence phenomena. the rates of break up and coalescence and consequently polymerization stability depend on several parameters, the most important of which are type and concentration of stabilizer. in this study, the effects of type and concentration of stabili...

2007
D. Baumgardner G. L. Kok G. B. Raga

The mass of light absorbing carbon (LAC) in individual, internally mixed aerosol particles was measured with the Single Particle Soot Photometer (SP2) in April of 2003 and 2005 and evaluated with respect to concentrations of carbon monoxide (CO), particle bound polycyclic aromatic hydrocarbons (PPAH) and condensation nuclei (CN). The LAC and CO have matching diurnal trends that are linked to tr...

2006
J. V. Niemi S. Saarikoski

Aerosol samples were collected at a rural background site in southern Finland in May 2004 during pollution episode (PM1∼16μg m−3, backward air mass trajectories from south-east), intermediate period (PM1∼5μg m−3, backtrajectories from north-east) and clean period (PM1∼2μg m−3, backtrajectories from northwest/north). The elemental composition, morphology and mixing state of individual aerosol pa...

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