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Absorptivity

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Hoyoung Kim – One of the best experts on this subject based on the ideXlab platform.

Alexander Kaplan – One of the best experts on this subject based on the ideXlab platform.

Cham Kim – One of the best experts on this subject based on the ideXlab platform.

  • visible light Absorptivity of a zincoxysulfide znoxs1 x composite semiconductor and its photocatalytic activities for degradation of organic pollutants under visible light irradiation
    Applied Catalysis A-general, 2007
    Co-Authors: Cham Kim, Seok Joo Doh, Se Geun Lee, Sung Jun Lee, Hoyoung Kim
    Abstract:

    Abstract This work reports the development of a visible-light sensible photocatalyst and the photocatalytic degradation of organic pollutants under visible-light irradiation. A composite semiconductor of ZnS and ZnO was prepared through co-precipitation process of Zn(NO3)2 in the mixed solution of aqueous Na2S and NaOH followed by calcination at 400 °C in N2 atmosphere. It was revealed that the composite semiconductor was a solid solution of ZnS and ZnO, a zincoxysulfide (ZnOxS1−x) having advanced visible-light Absorptivity. It was assured that the visible-light Absorptivity was caused by modification of band structure while the solid solution had been prepared, thus we suggested a reasonable band structure model involved in a zincoxysulfide. To observe its photocatalytic activity under visible-light illumination, photodegradation test was done and we confirmed that zincoxysulfide showed predominant photocatalytic activity due to its superior visible-light Absorptivity to pure ZnS and ZnO.

T Andert – One of the best experts on this subject based on the ideXlab platform.

  • microwave Absorptivity by sulfuric acid in the venus atmosphere first results from the venus express radio science experiment vera
    Icarus, 2012
    Co-Authors: Janusz Oschlisniok, Bernd Hausler, M Patzold, G L Tyler, M K Bird, Silvia Tellmann, S Remus, T Andert
    Abstract:

    Abstract The Venus Express (VEX) Radio Science experiment VeRa utilizes radio occultation techniques to investigate the Venus atmosphere over a wide range of latitudes. Radio attenuation measurements with the VEX 3.6 cm (X-band) signal provide information on the Absorptivity distribution within the Venus cloud deck. The combined results from 6 years of occultation measurements reveal a distinct latitudinal variation in Absorptivity in the altitude range from 50 to 55 km. Enhanced Absorptivity is observed at equatorial and mid-latitudes (0–50°S), exceeding 0.008 dB/km on the dayside and 0.01 dB/km on the nightside of the southern hemisphere. Poleward of 50°S latitude a decrease in the Absorptivity is observed, reaching minimal values at polar latitudes (>70°S), where the Absorptivity did not exceed 0.005 dB/km on the dayside and 0.004 dB/km on the nightside. The main absorber of radio waves in the Venus atmosphere, gaseous sulfuric acid, can serve as a tracer for atmospheric motions. The inferred Absorptivity was used to determine the abundance of gaseous sulfuric acid. Abundances of about 1–2 ppm are found between 0°S and 70°S latitude in the altitude range from 50 to about 52 km, sometimes increasing to values of about 3 ppm on the dayside and 5 ppm on the nightside near 50 km. The abundance at polar latitudes (>70°S) did not exceed 1 ppm within the considered altitude range. The Absorptivity and gaseous sulfuric acid height profiles are compared with previous measurements.

M K Bird – One of the best experts on this subject based on the ideXlab platform.

  • microwave Absorptivity by sulfuric acid in the venus atmosphere first results from the venus express radio science experiment vera
    Icarus, 2012
    Co-Authors: Janusz Oschlisniok, Bernd Hausler, M Patzold, G L Tyler, M K Bird, Silvia Tellmann, S Remus, T Andert
    Abstract:

    Abstract The Venus Express (VEX) Radio Science experiment VeRa utilizes radio occultation techniques to investigate the Venus atmosphere over a wide range of latitudes. Radio attenuation measurements with the VEX 3.6 cm (X-band) signal provide information on the Absorptivity distribution within the Venus cloud deck. The combined results from 6 years of occultation measurements reveal a distinct latitudinal variation in Absorptivity in the altitude range from 50 to 55 km. Enhanced Absorptivity is observed at equatorial and mid-latitudes (0–50°S), exceeding 0.008 dB/km on the dayside and 0.01 dB/km on the nightside of the southern hemisphere. Poleward of 50°S latitude a decrease in the Absorptivity is observed, reaching minimal values at polar latitudes (>70°S), where the Absorptivity did not exceed 0.005 dB/km on the dayside and 0.004 dB/km on the nightside. The main absorber of radio waves in the Venus atmosphere, gaseous sulfuric acid, can serve as a tracer for atmospheric motions. The inferred Absorptivity was used to determine the abundance of gaseous sulfuric acid. Abundances of about 1–2 ppm are found between 0°S and 70°S latitude in the altitude range from 50 to about 52 km, sometimes increasing to values of about 3 ppm on the dayside and 5 ppm on the nightside near 50 km. The abundance at polar latitudes (>70°S) did not exceed 1 ppm within the considered altitude range. The Absorptivity and gaseous sulfuric acid height profiles are compared with previous measurements.