AB S TRACT The optical counterparts of 23 extragalactic radio sources, of which 13 are in the southern hemisphere, have been observed by three telescopes equipped with CCDs. By reference to the Astrographic/Tycho (ACT) Reference, Carlsberg Meridian (CMC), Positions and Proper Motions (PPM), Hipparcos (HIP) and Lick Northern Proper Motion (NPM) catalogues, the positions of the 23 objects have be...

We present a catalog of 321 compact radio sources in the declination range 0 > δ > −30. The positions of these sources have been measured with a two–dimensional rms accuracy of 35 milliarcseconds using the NRAOa Very Large Array. Each source has a peak flux density> 50 mJy at 8.4 GHz. We intend for this catalog to be used mainly for selection of phase calibration sources for radio interferomete...

The orientations of buildings at the ancient Mesoamerican temple centers of Teotihuacan, Tula, Chichen Itza, Palenque, Tikal, Copan, and Monte Alban were plotted against the past magnetic declination for that region to test the possibility that they were constructed to align with magnetic north. Archaeomagnetic data did not extend back far enough for a check of Olmec buildings, the most likely ...

The Extended Self-Similarity (ESS) of cosmic microwave background (CMB) radiation has been studied using recent data obtained by the space-craft based Wilkinson Microwave Anisotropy Probe. Using the ESS and the high angular scale resolution (arcminutes) of the data it is shown that the CMB temperature space increments exhibit considerable and systematic declination from Gaussianity for high ord...

Steams, C. and Van der Voo, R., 1987. Paleomagnetic results from the Lower Devonian Llandstadwell Formation, Dyfed, Wales. Tectonophysics, 143: 329-334. A paleomagnetic investigation of the Lower Devonian Llandstadwell Eormation in southwest Wales has yielded a characteristic direction (declination = 196’. inclination = 5’) that passes a fold test. Comparison of the corresponding virtual geomag...

A model of diffusion accounting for a distribution of barriers heights is developed. It is demonstrated that activation energy of diffusion depends on the maximal height of barrier that is to be overcome, not on the average height of barriers. The temperature dependence of diffusivity (respectively of ion conductivity) declines from strict Arrhenius behavior, although the declination is not as ...

ABSTRACT We extend the SDSS Stripe 82 Standard Stars catalogue with post-2007 imaging data. This improved version lists averaged ugriz photometry for nearly a million stars brighter than r ∼ 22 mag. With 2–3 times more measurements per star, random errors are 1.4–1.7 smaller in original catalogue, and about three individual runs. Random new $\lesssim$0.01 mag 20.0, 21.0, 20.5, 19.0 u, g, r, i, ...