Presentación. 1820-1823. Nuevas miradas sobre la primera revolución europea del siglo XIX.

Se presenta el primer registro conocido del Lasiocampidae Streblote panda Hübner, [1820] 1816 para Ceuta (España).

We produce harmonics in the molecule ethylene ðC2H4Þ with two different wavelengths and three pulse durations. Due to the low ionization potential ðIp 1⁄4 10:5 eVÞ of C2H4, longer wavelengths are needed to extend the maximum photon energy produced. Our results show that regardless of the strong dependence of the efficiency of the harmonic generation process with wavelength, at 1820 nm the cutof...

Using manuscript and secondary sources, this paper calculates a consistent series of day wages for male farm workers in England from 1670 to 1850. The new series differs considerably for the years 1790-1820 from the still widely used Bowley series. Wages are also estimated for four regions by quinquennia. The new series suggests that real agricultural wages showed little long term movement in t...

We present the results of a study with the Swift Burst Alert Telescope in the 14 – 195 keV range of the long-term variability of 5 low mass X-ray binaries with reported or suspected super-orbital periods — 4U 1636-536, 4U 1820-303, 4U 1916-053, Cyg X-2 and Sco X-1. No significant periodic modulation was detected around the previously reported values in the 4U 1916-053, Cyg X-2 or Sco X-1 light ...

The horse fly fauna (Diptera: Tabanidae) of Jordan is, after Israel, the richest in the Levant, with 24 known species. During the 20-year project "The Ecology and Zoogeography of the Lepidoptera of the Near East," we regularly collected blood-feeding flies, resulting in 11 additional species of Tabanidae for Jordan. The new records are: Atylotus quadrifarius (Loew, 1874), Chrysops caecutiens (L...

Kemp neatly calls, the "fantasia", expressed by the painting of the Last Supper in which the perspectival illusion is interestingly explained. In the scientific field, similarly inspired ingenuity is found in Leonardo's geometrical transformations. The physiological truth so beautifully symbolized in the Leda and the Swan and the portrait of a Lady on a Balcony (the Mona Lisa) is here interpret...