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  • Articles  (334)
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  • 1
    Electronic Resource
    Electronic Resource
    Inhibitors of aldosterone secretion
    Amsterdam : Elsevier
    Journal of Steroid Biochemistry 27 (1987), S. 941-946 
    Details
    ISSN: 0022-4731
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-4731(87)90171-3
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  • 2
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    Observation system simulation experiment for new radio occultation observations using multiple small satellites on Venus (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-04-25
    Description: The radio occultation (RO) observations using multiple small satellites are expected not to be interrupted by a thick global cloud layer at about 48–70 km altitudes, and to enable frequent observations of the global vertical temperature distribution at 40–90 km altitudes. In this study, we focus on a phenomenon peculiar to Venus called “cold collar”, in which the polar region becomes warmer than the surrounding latitudes of 60–80 ° at 65 km altitude, and the Observation System Simulation Experiment (OSSE) is carried out assuming RO observation by satellites to be launched in the future. For the Venus assimilation system, “ALEDAS-V” (AFES LETKF Data Assimilation System for Venus) based on LETKF (Local Ensemble Transform Kalman Filter) is used. For the ensemble forecast, the Venus general circulation model “AFES-Venus” is used. For the pseudo-observation data, we use the temperature output of the IPSL Venus GCM (now called the Venus “Planetary Climate Model; PCM”) which represent ideal cold collar by radiative forcing. The temperature at 40–90 km altitudes corresponding to observation points obtained by orbit calculations is used as pseudo-observation data. As a result, while the experiment without assimilation (free run) cannot reproduce the cold collar at 67 km altitude, the RO OSSE reproduces it.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 3
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    Super-rotation independent of horizontal diffusion reproduced in a Venus GCM (AFES-Venus) (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-04-25
    Description: In the Venus atmosphere, fast zonal wind has been observed, which is called super-rotation, because it is much faster than the rotation period of the solid part of the planet. So far, Venus general circulation models (VGCMs) have been used to study the super-rotation and several studies obtained fully developed super-rotation faster than 100 m/s. It has been suggested that horizontal diffusion and resolution are important factors to generate and maintain the super-rotation in the general circulation model because waves which transport angular momentum are sensitive to them. Here, we investigated how the super-rotation depends on the magnitude of horizontal hyper diffusion using a VGCM (AFES-Venus) with medium and high resolutions (T42L60 and T159L120 where T and L denote the triangular truncation number for spherical harmonics and vertical levels, respectively). In both the runs, we found a parameter range where the structure of fully developed super-rotation is almost independent of the magnitude of horizontal diffusion. Spectral analysis shows that unrealistically strong super-rotation is developed when medium-scale disturbances are dissipated by stronger horizontal diffusion. On the other hand, artificially weak super-rotation is also realized because spurious small-scale disturbances are accumulated when the horizontal diffusion is too weak. We elucidated that the super-rotation reproduced in our VGCM is caused by resolved eddies. Moreover, we could estimate appropriate magnitude of horizontal diffusion by the spectral analysis. This study has broad implications for the planetary atmospheric science, not only in modeling but also in observational aspects.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 4
    Electronic Resource
    Electronic Resource
    Short-period fluctuations in the atmospheric electric field over the ocean (1978)
    Springer
    Pure and applied geophysics 116 (1978), S. 1089-1100 
    Details
    ISSN: 1420-9136
    Keywords: Atmospheric electric field
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Fluctuations of short period in the atmospheric electric field were studied through the measurements of electric field and space charge density on the Mid-Pacific Ocean. The amplitude of fluctuation is about one third of the mean electric field, and the period mainly ranges from 2 to 5 min. The fluctuations are considered to be under the influence of spatial and temporal variation of space charge layer that possibly originates from the electrode effect above the sea surface. The unit of electrical irregularities in the atmosphere above the ocean has horizontal scale of the order of 1.5 km and indicates a tendency to become large as the wind speed increases. The vertical scale of space charge layer is estimated at several tens meters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00874673
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  • 5
    Electronic Resource
    Electronic Resource
    A seasonal effect in diurnal variation of the atmospheric electric field on the Pacific coast of Japan (1980)
    Springer
    Pure and applied geophysics 118 (1980), S. 953-963 
    Details
    ISSN: 1420-9136
    Keywords: Electric field ; Atmospheric electric field ; —seasonal variation of
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The measurement of the atmospheric electric field was carried out with a field mill at a small island in a bay on the Pacific coast of Japan. The data obtained during 80 months from 1971 to 1977 were analysed. It was found that characteristically the diurnal variation regularly alters with the seasons. Whereas the electric field in winter has the same diurnal pattern as that observed at globally representative stations, it exhibits in summer a pattern depending on the variation of the local electric conductivity. The alteration is inferred to be associated with regional atmospheric conditions surrounding the observation site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01593042
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  • 6
    Electronic Resource
    Electronic Resource
    Measurement of lower-stratospheric aerosol by a balloon-borne photometer (1980)
    Springer
    Pure and applied geophysics 118 (1980), S. 858-866 
    Details
    ISSN: 1420-9136
    Keywords: Atmospheric aerosol ; Aerosol ; Stratospheric
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Height distribution of the stratospheric aerosol extinction coefficient was measured in the altitude range 10 to 20 km by a balloon-borne multi-color sunphotometer in May 1978. It is demonstrated that detailed structures of the distribution of stratospheric aerosol can be remotely measured by the solar occultation method as well as by lidar andin situ particle counter observations. In the aerosol layer appearing at 18 km altitude the extinction coefficient at 800–1000 nm wavelength reached to 3×10−7 m−1, which was reasonable compared with lidar observations. Wavelength dependence of the aerosol optical depth was crudely estimated to be proportional toλ −1.5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01593037
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  • 7
    Electronic Resource
    Electronic Resource
    Stratospheric aerosol inferred from electrical conductivity during a volcanically quiescent period (1982)
    Springer
    Pure and applied geophysics 120 (1982), S. 1-10 
    Details
    ISSN: 1420-9136
    Keywords: Stratospheric aerosol ; Stratospheric electric conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Profiles of electrical conductivity in the troposphere and stratosphere were measured by balloon-borne conductivity sondes at Garmisch-Partenkirchen, West Germany, from January to May, 1980, when volcanic activity was low. The aerosol concentration has been deduced from the relative decrease of conductivity from surrounding values by assuming the effective attachment coefficient of ions to aerosols. A prominent decrease of the conductivity near the tropopause is usually observed indicating high concentrations of Aitken particles (500–1000 cm−3). A decrease of conductivity, well above the tropopause, is sometimes observed, probably due to the transport of tropospheric Aitken particles with high concentration (200–400 cm−3) into the stratosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00879422
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  • 8
    Electronic Resource
    Electronic Resource
    The effect of the Mt St Helens eruption on tropospheric and stratospheric ions (1982)
    Springer
    Pure and applied geophysics 120 (1982), S. 11-17 
    Details
    ISSN: 1420-9136
    Keywords: Tropospheric and stratospheric ions ; Volcanoes — effects on ion concentration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Balloon-borne observations of electrical conductivity in the troposphere and stratosphere were performed using conductivity sondes at Garmisch-Partenkirchen, West Germany, from June to November, 1980, after the Mt St Helens eruption. A significant decrease of atmospheric ions in the altitudes from the troposphere to lower stratosphere has been detected until several months after the eruption in comparison with the observational results obtained before the eruption. Simulteneous ruby lidar observation a month after the eruption indicates an increased amount of aerosol at nearly the same altitude as that of conductivity decrease. Several months after the eruption it appears that aerosols detected by lidar and those effective in reducing ion concentration have different profiles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00879423
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  • 9
    Electronic Resource
    Electronic Resource
    Limited feeding of potassium nitrate for intracellular lipid and triglyceride accumulation of Nannochloris sp. UTEX LB1999 (2000)
    Springer
    Applied microbiology and biotechnology 54 (2000), S. 112-117 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Limited feeding of nitrate during culture of Nannochloris sp. UTEX LB1999 for intracellular lipid and triglyceride accumulation was investigated with the aim of obtaining cells superior for liquefaction into a fuel oil. The intracellular lipid contents and the percentage of triglycerides in the lipids of cells grown in a nitrogen-limited medium (0.9 mM KNO3) were 1.3 times as high as those grown in a modified NORO medium containing 2.0–9.9 mM KNO3. However, the cell concentration was too low for the practical production of fuel oil by high-pressure liquefaction of the cell mass. A single feeding of 0.9 mM nitrate after nitrate depletion during cultivation in a nitrate-limited medium increased the cell concentration to twice that obtained without such feeding, and the lipid content was maintained at a high level. The timing of nitrate feeding, i.e., whether it was given during the log phase (before nitrate depletion), the constant growth phase (just after the depletion), or the stationary phase (after the depletion), had negligible effect on the intracellular lipid content and percentage of triglycerides in the lipids. When 0.9 mM nitrate was intermittently fed ten times during the log phase in addition to the initial nitrate feed (0.9 mM), the cell concentration reached almost the same (2.16 g/l) and the intracellular lipid content and the percentage of triglycerides in the lipids increased from 31.0 to 50.9% and 26.0 to 47.6%, respectively, compared with those of cells cultured in a modified NORO medium containing 9.9 mM KNO3 without additional nitrate feeding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530000333
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  • 10
    Electronic Resource
    Electronic Resource
    Line emission from semiconductive CdS single crystals (1982)
    Springer
    Applied physics 27 (1982), S. 125-127 
    Details
    ISSN: 1432-0630
    Keywords: 78.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract When a pulse voltage of sufficient width is applied to a semiconductive CdS bar, a large increase in the electric current occurs with an intense light emission. The dominant part of this emission spectrum consists of Cd(I) atomic lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615815
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