Results 141 to 150 of about 134,603 (317)
Chemistry – An Asian Journal, EarlyView.A new visible light‐induced method is reported for the C3‐alkylation of imidazo[1,2‐a]pyrimidines and ‐pyridines with aryldiazoacetates. This protocol can be performed in open air and serves as a convenient entry to several known and new molecules. A formal synthesis of zolpidem is achieved by changing the alkylating agent to an appropriate hypervalent
Ronei M. S. Souza +6 more
wiley +1 more source
The Slow‐Rotating Nucleus of Comet C/2013 R1 (Lovejoy)
Astronomische Nachrichten, EarlyView.ABSTRACT The close approach of comet C/2013 R1 (Lovejoy) allowed us to conduct an in‐depth study of the morphology of the inner coma. From the measurement of the dust emission structures expanding near the cometary nucleus in November–December 2013, we derived a slow rotation period of 47.8±1.2$$ 47.8\pm 1.2 $$ h.
Federico Manzini +12 more
wiley +1 more source
Astronomische Nachrichten, EarlyView.ABSTRACT Classification of galaxies, stars, and quasars using spectral data is fundamental to astronomy, but often relies heavily on redshift. This study evaluates the performance of 10 machine learning algorithms on SDSS data to classify these objects, with a particular focus on scenarios where redshift information is unavailable.
Debashis Chatterjee, Prithwish Ghosh
wiley +1 more source
Gaia Search for Stellar Companions of TESS Objects of Interest V
Astronomische Nachrichten, EarlyView.ABSTRACT In this paper, we present the latest results of our ongoing multiplicity survey of (Community) TESS Objects of Interest, using astrometry and photometry from the latest data release of the ESA Gaia mission to detect stellar companions of these stars and to characterize their properties.
Markus Mugrauer +3 more
wiley +1 more source
IV. On the power of penetrating into space by telescopes; with a comparative determination of the extent of that power in natural vision, and in telescopes of various sizes and constructions; illustrated by select observations [PDF]
William Herschel
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Stochastic Quantum Mechanics in Curved Spaces: Application to Schwarzschild Black Holes
Astronomische Nachrichten, EarlyView.ABSTRACT In this work, we start from the hypothesis that the universe lives in a Gravitational Wave Background (GWB). From this hypothesis, it follows that space–time is not locally flat because we have to take into account the fluctuations of the GWB in space–time. This implies that sufficiently small particles will feel these oscillations, preventing
Juan S. Jerez‐Rodriguez +1 more
wiley +1 more source
On the stellar parallax plates taken with the Yerkes telescope.
, 1904 Frank Schlesinger
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The 200-Inch Telescope and Some Problems It May Solve [PDF]
, 1947 Edwin Hubble
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