Showing 281 - 300 results of 359 for search '"astronomer"', query time: 0.04s Refine Results
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    Redshifting the Study of Cold Brown Dwarfs and Exoplanets: The Mid-infrared Wavelength Region as an Indicator of Surface Gravity and Mass by S. K. Leggett, Pascal Tremblin

    Published 2025-01-01
    “…For the first time, astronomers have access to mid-infrared spectroscopy for objects colder than 600 K. …”
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  7. 287

    Phylogenetic relationships between Palaearctic species of the Anopheles maculipennis complex (Diptera: Culicidae) revealed by different approaches and markers. The problem of conse... by O. V. Vaulin, Yu. M. Novikov

    Published 2016-12-01
    “…A hypothesis about a significant role of the disparity between the astronomical and biological times in the interpretation of evolutionary processes was proposed. …”
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  8. 288

    Causes of global extinctions in the history of life: facts and hypotheses by T. M. Khlebodarova, V. A. Likhoshvai

    Published 2020-07-01
    “…The review discusses possible causes for mass extinctions in the light of the influence of abiogenic factors, planetary or astronomical, and the consequences of their actions. …”
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    Quantum limits of parameter estimation in long-baseline imaging by Aqil Sajjad, Michael R. Grace, Saikat Guha

    Published 2024-02-01
    “…Telescope systems with distributed apertures are a well-established approach for boosting resolution in astronomical imaging. However, theoretical limits on quantitative imaging precision, and the fundamentally best possible mode-sorting, beam-combining, and detection schemes to use with such arrays, remain largely unexplored. …”
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  12. 292

    Temporal and Spatial Characteristics of Tidal Current in the Eastern Waters of Macao in Summer by FANG Shenguang, HUANG Chunhua, YU Fenghua, WANG Shijun, HE Yong

    Published 2023-01-01
    “…The eastern waters of Macao at the Pearl River Estuary are an important channel for water and sediment discharged by the west beach of Lingdingyang Estuary and Macao waterway.The measured data during the flood seasons shows that the waters feature semi-diurnal tidal currents,and the average velocity in this area is about 21~23 cm/s during the flood and 18~29 cm/s during the ebb.The flowing direction is stable,namely,N—NNW trending during the flood and S trending during the ebb,and tidal power is stronger in the south.The average velocity in the waters is mainly dependent on the tidal type,and the flood runoff mainly affects residual currents and tidal duration.A stagnant area is formed in the north of the waters during the flood,and the water and sediment in the south are transported outside the Lingdingyang Estuary.Wind on the sea surface has a significant impact on the vertical dynamic structure of flow in the range of 40% water depth,and residual flow direction in the range of 10% water depth near the sea surface has a good follow-up.During southwest wind,the maximum horizontal flow velocity gradient appears in the second flood and ebb stage and corresponds to the occurrence of the maximum sediment concentration in the tidal cycle.Due to the shallow water depth in the north of the waters,the bed shear gradient force is generally greater than that in the south.As a result,the sediment concentration observed in the north of the waters is significantly higher than that in the southeast.According to the comprehensive analysis,astronomical tides,flood runoff,and wind are the main controlling dynamic factors in the waters.The friction resistance of shallow water in the north is drastically larger than that in the south,which leads to a significant difference in tidal duration and phases of vertical floods and ebbs.As a consequence,the special vertical dynamic structure of convergence on the surface and dispersion at the bottom is formed in the waters,which is strengthened by massive freshwater runoffs during the flood seasons.This leads to the trend of surface diluted water drifting to the east and the invasion of the nearshore by bottom high-salt water.…”
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  13. 293

    Using the Circular Economy to Mitigate the Global Electronic Waste Challenge: A Systematic Literature Review Approach by Mfowabo Maphosa, Vusumuzi Maphosa

    Published 2024-12-01
    “…The findings show that research outputs increased substantially from two in 2014 to 257 in 2023 and citations grew astronomically, from one in 2014 to 8409 in 2023. The analysis reveals five research clusters: material management and resource recovery, business practices and circular economy strategies, technology integration and sustainability, recycling challenges, and environmental health and sustainable practices. …”
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