scholarly journals Spectral absorption properties of aerosol particles from 350–2500nm

2009 ◽  
Vol 36 (13) ◽  
Author(s):  
J. Vanderlei Martins ◽  
Paulo Artaxo ◽  
Yoram J. Kaufman ◽  
Andrea D. Castanho ◽  
Lorraine A. Remer
Keyword(s):  
Aerosol Particles ◽  
Spectral Absorption ◽  
Absorption Properties

Spectral absorption properties of dissolved and particulate matter in Lake Erie

2008 ◽  
Vol 112 (4) ◽  
pp. 1702-1711 ◽  
Author(s):  
C BINDING ◽  
J JEROME ◽  
R BUKATA ◽  
W BOOTY
Keyword(s):  
Particulate Matter ◽  
Lake Erie ◽  
Spectral Absorption ◽  
Absorption Properties

First International Workshop on Light Absorption by Aerosol Particles: Background, Activities, and Preliminary Results, 28 July–8 August 1980 Ft. Collins, Colo.

1981 ◽  
Vol 62 (9) ◽  
pp. 1321-1327 ◽  
Author(s):  
Hermann E. Gerber ◽  
Edward E. Hindman
Keyword(s):  
Light Absorption ◽  
Atmospheric Aerosol ◽  
International Workshop ◽  
Aerosol Particles ◽  
Measurement Techniques ◽  
State University ◽  
Absorption Properties ◽  
Colorado State University ◽  
Preliminary Results ◽  
Atmospheric Aerosol Particles

The amount of light absorbed by aerosol particles has not been determined with certainty because errors in measurement techniques have been difficult to quantify. To improve this situation, a workshop was conducted to establish experimentally the errors for the various techniques. The workshop was held between 28 July and 8 August 1980 at the Cloud Simulation and Aerosol Laboratory at Colorado State University. Preliminary results show that, for the same well-characterized aerosol particles, substantial differences exist between results from the various techniques. These differences can explain a fraction of the variations reported for the light absorption properties of similar types of atmospheric aerosol particles.

Effect of rare earth elements in combination with NiO on the spectral-absorption properties of glasses

1972 ◽  
Vol 29 (12) ◽  
pp. 798-800
Author(s):  
S. G. Kovchur ◽  
S. E. Savitskii ◽  
Ya. V. Shklyar ◽  
A. P. Gaiduk
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Spectral Absorption ◽  
Absorption Properties

scholarly journals Natural Flavonoids as Potential Photosensitizers for Dye-Sensitized Solar Cells

2019 ◽  
Vol 26 (1) ◽  
pp. 29-36 ◽  
Author(s):  
Agata Zdyb ◽  
Stanisław Krawczyk
Keyword(s):  
Solar Cells ◽  
Absorption Spectra ◽  
Dye Sensitized Solar Cells ◽  
Visible Range ◽  
Dye Molecules ◽  
Spectral Absorption ◽  
Absorption Properties ◽  
Dye Sensitized ◽  
Structural Differences ◽  
Sensitized Solar Cells

Abstract Natural flavonoids quercetin, morin, fisetin and luteolin were studied as potential photosensitizers for dye-sensitized solar cells (DSSC). Spectroscopic methods were used to investigate the formation of dye/TiO2 nanoparticles assemblies and the development of their absorption spectra. The results show that the flavonoids adsorb well on TiO2 nanoparticles and this process causes the shift of absorption spectra from the near UV into the visible range of solar light. The mode of binding of the dye molecules on TiO2 surface is analyzed by comparison of spectral absorption properties and with the use of structural differences introduced by fisetin and luteolin for discrimination between several possibilities.

scholarly journals Relationships between Visual Field Sensitivity and Spectral Absorption Properties of the Neuroretinal Rim in Glaucoma by Multispectral Imaging

2011 ◽  
Vol 52 (12) ◽  
pp. 8732 ◽  
Author(s):  
Jonathan Denniss ◽  
Ingo Schiessl ◽  
Vincent Nourrit ◽  
Cecilia H. Fenerty ◽  
Ramesh Gautam ◽  
...  
Keyword(s):  
Visual Field ◽  
Multispectral Imaging ◽  
Spectral Absorption ◽  
Absorption Properties ◽  
Neuroretinal Rim ◽  
Field Sensitivity

Spectral absorption properties of organic carbon aerosol during a polluted winter in Beijing, China

2021 ◽  
Vol 755 ◽  
pp. 142600
Author(s):  
Yunfei Wu ◽  
Jiwei Li ◽  
Chen Jiang ◽  
Yunjie Xia ◽  
Jun Tao ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Spectral Absorption ◽  
Absorption Properties ◽  
Beijing China

Studies on the hemoglobin of the great horned owl (Bubo virginianus)

1969 ◽  
Vol 47 (6) ◽  
pp. 571-576 ◽  
Author(s):  
C. Abercrombie ◽  
B. R. Maber ◽  
F. Vella
Keyword(s):  
Alkali Resistance ◽  
Human Hemoglobin ◽  
Spectral Absorption ◽  
Absorption Properties ◽  
Specific Staining ◽  
Bubo Virginianus ◽  
Homologous Sequences ◽  
Starch Gels ◽  
Polypeptide Chains ◽  
Peptide Maps

Hemoglobins of 24 adult great horned owls (Bubo virginianus) were found to be identical on the basis of electrophoretic (using filter paper and agar and starch gels in various continuous and discontinuous buffer systems), alkali resistance, and spectral absorption properties. Peptide maps of tryptic and chymotryptic digests of globin from two specimens were compared with similarly produced maps of globin from human hemoglobin A1. Similarity in position on the map and in specific staining properties of several spots indicated that a number of presumably homologous sequences occur in both these globins. These studies indicate that in this species of owl the adult globin contains two different polypeptide chains (α and β), of which one also occurs in fetal globin (α and γ), and that the β chains in this species and in man are more dissimilar than the α chains of the same two species.

scholarly journals Light absorption properties of aerosols over Southern West Africa

2019 ◽  
Author(s):  
Cyrielle Denjean ◽  
Thierry Bourrianne ◽  
Frederic Burnet ◽  
Marc Mallet ◽  
Nicolas Maury ◽  
...  
Keyword(s):  
Optical Properties ◽  
West Africa ◽  
Biomass Burning ◽  
Aerosol Particles ◽  
Anthropogenic Pollution ◽  
Absorption Properties ◽  
Air Masses ◽  
Carbon Particles ◽  
Biomass Burning Aerosol ◽  
Biomass Burning Particles

Abstract. Southern West Africa (SWA) is an African pollution hotspot but a relatively poorly sampled region of the world. We present an overview of in-situ aerosol optical measurements collected over SWA in June and July 2016 as part as the DACCIWA (Dynamics–Aerosol–Chemistry–Clouds Interactions in West Africa) airborne campaign. The aircraft sampled a wide range of air masses, including anthropogenic pollution plumes emitted from the coastal cities, long-range transported biomass burning plumes from Central and Southern Africa and dust plumes from the Sahara and Sahel region, as well as mixtures of these plumes. The specific objective of this work is to characterize the regional variability of the vertical distribution of aerosol particles and their spectral optical properties (single scattering albedo: SSA, asymmetry parameter, extinction mass efficiency, scattering Ångström exponent and absorption Ångström exponent: AAE). First findings indicate that aerosol optical properties in the planetary boundary layer were dominated by a widespread and persistent biomass burning loading from the Southern Hemisphere. Despite a strong increase of aerosol number concentration in air masses downwind of urban conglomerations, spectral SSA were comparable to the background and showed signatures of the absorption characteristics of biomass burning aerosols. In the free troposphere, moderately to strongly absorbing aerosol layers, dominated by either dust or biomass burning particles, occurred occasionally. In aerosol layers dominated by mineral dust particles, SSA varied from 0.81 to 0.92 at 550 nm depending on the variable proportion of anthropogenic pollution particles externally mixed with the dust. Biomass burning aerosol particles were significantly more light absorbing than those previously measured in other areas (e.g. Amazonia, North America) with SSA ranging from 0.71 to 0.77 at 550 nm. The variability of SSA was mainly controlled by variations in aerosol composition rather than in aerosol size distribution. Correspondingly, values of AAE ranged from 0.9 to 1.1, suggesting that lens-coated black carbon particles were the dominant absorber in the visible range for these biomass burning aerosols. Comparison with literature shows a consistent picture of increasing absorption enhancement of biomass burning aerosol from emission to remote location and underscores that the evolution of SSA occurred a long time after emission. The results presented here build a fundamental basis of knowledge about the aerosol optical properties observed over SWA during the monsoon season and can be used in climate modelling studies and satellite retrievals. In particular and regarding the very high absorbing properties of biomass burning aerosols over SWA, our findings suggest that considering the effect of internal mixing on absorption properties of black carbon particles in climate models should help better assessing the direct and semi-direct radiative effects of biomass burning particles.

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