229 research outputs found
"Global Observation Data Analysis System (GODAS): Visualization tools for global atmospheric data based on PV-wave and their applications to data analysis of ILAS, TOMS, and SAGEII"
No full textOn the Long Term Variation of Stratospheric Aerosol Content After the Eruption of Volcano El Chichón: Lidar Measurements at Nagoya, Japan
No full textLidar observation of stratospheric aerosol increase after the El Chichon eruption: Nagoya, April to December 1982
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The Effects of the Volcanic Eruption of St. Helens on the Polarization Properties of Stratospheric Aerosols; Lidar Measurement at Nagoya
No full textLidar observation of stratospheric aerosol increase after the El Chichon eruption: Nagoya, April to December 1982
No full textP(論文)The volcano El Chichon (Mexico) erupted violently over several days at the end of March and at the beginning of April 1982. After the eruptions a sudden increase of backscattered light from the stratospheric aerosol layer was detected by a lidar (0.6943μm) at Nagoya (35°N, 137°E) in mid-April 1982. At the end of May the observed scattering ratio reached the maximum value about 44. The effect of the eruption of El Chichon on the stratospheric aerosol layer seems to be larger than that of the volcan de Fuego eruption or Mt. St. Helens eruption. Immediately after the eruption, an apparent two-layer structure of scattering ratio profiles was observed. According to the radio sonde data over Japan, the aerosols in the upper layer were possibly transported by easterly wind and those in the lower layer by westerly wind, respectively. After September 1982 the centroid height of particulate backscattering and the main peak height decreased gradually due to the effect of sedimentation.departmental bulletin pape
Analysis of ozone loss in the Arctic stratosphere during the late winter and spring of 1997 using the Chemical Species Mapping on Trajectories (CSMT) technique
No full textUranyl nitrate-induced glomerular-basement-membrane alterations in rabbits: a quantitative-analysis
No full textPT: J; CR: AVASTHI PS, 1980, J CLIN INVEST, V65, P121 BLANTZ RC, 1985, KIDNEY INT, V28, P733 FOULKES EC, 1971, TOXICOL APPL PHARM, V20, P380 HAYASHIDA M, 1986, EXP GERONTOL, V21, P535 KANWAR YS, 1979, J CELL BIOL, V81, P137 KOBAYASHI S, 1984, KIDNEY INT, V26, P808 LATOUCHE YD, 1987, HEALTH PHYS, V53, P147 OSTERBY R, 1971, LAB INVEST, V25, P15 OSTRBY R, 1975, ACTA MED SCAND S, V574, P1 SEILER MW, 1975, SCIENCE, V189, P390 SINGH A, 1981, PATHOLOGY, V13, P487 SINGH A, 1985, ANN M AM ASS ADV SCI STEFFES MW, 1983, LAB INVEST, V49, P82 STEIN JH, 1975, KIDNEY INT, V8, P27 WEHNER H, 1973, DIABETOLOGIA, V9, P255; NR: 15; TC: 4; J9: BULL ENVIRON CONTAM TOXICOL; PG: 7; GA: HC562Source type: Electronic(1
Atmospheric Chemistry of Ozone Photolysis at High Latitudes: Laboratory and Modeling Studies (Extended Abstract)
No full textapplication/pdf紀要類 (bulletin)606312 bytesdepartmental bulletin pape
Correlated X-ray/ultraviolet/optical variability in the very low mass AGN NGC 4395
No full textWe report the results of a 1-yr Swift X-ray/ultraviolet (UV)/optical programme monitoring the dwarf Seyfert nucleus in NGC4395 in 2008-2009. The UV/optical flux from the nucleus was found to vary dramatically over the monitoring period, with a similar pattern of variation in each of the observed UV/optical bands (spanning 1900-5500 Å). In particular, the luminosity of NGC4395 in the 1900 Å band changed by more than a factor of 8 over the monitoring period. The fractional variability was smaller in the UV/optical bands than that seen in the X-rays, with the X-ray/optical ratio increasing with increasing flux. Pseudo-instantaneous flux measurements in the X-ray and each UV/optical band were well correlated, with cross-correlation coefficients of ≥0.7, significant at 99.9per cent confidence. Archival Swift observations from 2006 sample the intra-day X-ray/optical variability on NGC4395. These archival data show a very strong correlation between the X-ray and b bands, with a cross-correlation coefficient of 0.84 (significant at >99per cent confidence). The peak in the cross-correlation function is marginally resolved and asymmetric, suggesting that X-rays lead the b band, but by ≤1h. In response to recent (2011 August) very high X-ray flux levels from NGC4395 we triggered Swift target of opportunity observations, which sample the intra-hour X-ray/UV variability. These observations indicate, albeit with large uncertainties, a lag of the 1900 Å band behind the X-ray flux of ∼400s. The tight correlation between the X-ray and UV/optical lightcurves, together with the constraints we place on the lag time-scale, is consistent with the UV/optical variability of NGC4395 being primarily due to reprocessing of X-ray photons by the accretion disc
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