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11.
The present work shows how the new defined value Q can play a role in spectral reclassification of Be stars. 相似文献
12.
The present work represents a catalogue of spectral classification and photometric data of 2047 B type stars using the Q method. 相似文献
13.
Natural Hazards - To investigate the propagation of meteorological droughts to agricultural and hydrological droughts, the relationship between droughts was analyzed using observed precipitation... 相似文献
14.
Kazuo Abe Norihisa Nakagawa Katsuyuki Abo Mutsumi Tsujino 《Journal of Oceanography》2013,69(2):269-275
Temporary enhancement of the nutrient concentrations in the coastal area was observed after heavy rain in the central Seto Inland Sea in July 2012. After passage of a stationary front accompanied by heavy rain, the river outflow was enhanced, and low salinity and high nutrient concentrations were detected near the mouths of rivers. The offshore salinity and nutrients increased and decreased, respectively, which suggested that a snapshot event, such as heavy rain, could influence the short-term variation of the coastal marine environmental conditions, such as the salinity and nutrient distributions. 相似文献
15.
M.A. Hamdy M.S. Abo Elazm S.M. Saad H.O. Nafie H.E. Abdel Baeth 《Astrophysics and Space Science》2002,279(3):203-218
The aim of this paper is to get new critertia for spectral classification of some early type stars which depend on the flux
in the UV region λ λ 1500–2500 by carrying out spectrophotometric analysis of observational ultraviolet data of stars obtained
by the S2/68 Ultraviolet Sky Survey Telescope (UVSST) aboard the European Space Research Organization (ESRO) Satellite TD1.
We have developed these new criteria based on the Intrinsic Ultraviolet Colour Index (IUI), and the Intrinsic Flux Ratio (IFR).
Using these quantities we are going to represent the results of spectral classification of 323 early type stars mainly from
spectral type B and A. The results of calculations of the Intrinsic Flux Ratios for the stars under investigation together
with their Colour Temperatures (Tc) are given. Comparison between our suggested two new criteria with the MK classification
system and Cucchairo (1980) classification system was carried out.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
16.
Awad Adel M. Mashat Abdul-Wahab S. Salem Faisal F. Abo 《Arabian Journal of Geosciences》2015,8(4):2265-2282
Arabian Journal of Geosciences - Three classes of dust over the southwest region of the Kingdom of Saudi Arabia were classified based on both the values and distribution of the TOMS Aerosol Index.... 相似文献
17.
Yasunori Fujiwara Yoshiyuki Hamaguchi Takuji Nakamura Masaki Tsutsumi Makoto Abo 《Earth, Moon, and Planets》2008,102(1-4):309-314
The MU radar of RISH (Research Institute for Sustainable Humanosphere, Kyoto University), which is a MST radar (46.5 MHz,
1 MW peak power), has been successfully applied to meteor studies by using its very high versatility. The system has recently
renewed with 25 channel digital receivers which significantly improved the sensitivity and precision of interferometer used
in meteor observation. The transmission is now synchronized to GPS signals, and two external receiving sites with a ranging
capability has additionally been operated in order to determine the trajectories and speeds of meteoroids. 相似文献
18.
Julie Pariseau Richard Saint-Louis Maryse Delaporte Mohammed Abo El Khair Réjean Tremblay Emilien Pelletier 《Marine pollution bulletin》2009,58(4):503-514
The aetiology of haemic neoplasia (HN) is unknown, so far but many causative factors are suggested such as viral, pollution and genetics. The aim of this study was to determine if, under chronic exposure, two major pesticides (chlorothalonil and mancozeb) which are used in potato production could induce HN in soft-shell clams (Mya arenaria). Short-term experiments with acute exposure were also performed. Clams were collected from an epizootic site (North River, PEI) and from a site free of the disease (Magdalen Islands, Quebec). The tetraploid level of haemocytes was assessed by flow cytometry for each clam to determine the HN status. The bioaccumulation of pesticides in tissues was quantified by gas chromatography/mass spectrometry (GC/MS) for chlorothalonil while mancozeb and manganese were quantified by inductively coupled plasma-mass spectrometer (ICP/MS). Long term exposure to fungicide Bravo 500® did not induce high tetraploid levels on negative calm from North River and the analysis of the digestive gland and the mantle did not reveal any detectable level of chlorothalonil. In the Manzate 200 DF®, some clams revealed high level of tetraploid cells but no difference were observed between the treatments and the control. The analysis of the digestive gland and the mantle for manganese did not highlight any significant difference in tissue concentration (p = 0.05). For the acute exposure, chlorothalonil analysis showed that the active ingredient is distributed between four chlorinated compounds: 99.5% for chlorothalonil isomers, 0.4% for pentachlorothalonil and 0.1% for trichlorothalonil isomers. For a 72 h experiment, the accumulation was within 4 h; the higher tissue concentration of chlorothalonil was 59.2 μg g−1 in the mantle after 48 h, following by a decrease to an undetectable level at the end. For the manganese, the accumulation was detected after 4 h; the higher tissue concentration was 48.8 μg g−1 in the mantle after 24 h and, over the following 48 h, the accumulation decreased until the end of the trial. Based on the data, the accumulation of these fungicides seems to be transitory. Chlorothalonil and mancozeb are both oxidative-stress promoters and could have induced cell dysfunction while in the tissue. Study on the effect of these fungicides on the p53 protein system is an example of strategy that would provide information on cellular events promoting neoplasia. 相似文献