The 35 X 42.5 cm (14 X 17 inch) chest film: 7.5 cm too long

Pablo Picasso (1881–1973). Guernica (1937). Oil on canvas, 350 cm x 782 cm

ABOUT THE COVER " I t isn't up to the painter to define the symbols, " said Pablo Picasso when asked to explain his celebrated mural, Guernica. " ….The public who look at the picture must interpret the symbols as they understand them. " Picasso himself did not know what the work would turn out to be when he was commissioned to paint the center-piece for the Spanish Pavilion of the 1937 World's ...

21-cm fluctuations from inhomogeneous X-ray heating before reionization

Many models of early structure formation predict a period of heating immediately preceding reionization, when X-rays raise the gas temperature above that of the cosmic microwave background. These X-rays are often assumed to heat the intergalactic medium (IGM) uniformly, but in reality will heat the gas more strongly closer to the sources. We develop a framework for calculating fluctuations in t...

Proposed laser-driven, dielectric microstructure few-cm long undulator for attosecond coherent X-rays

This article presents the concept of an all-dielectric laser-driven undulator for the generation of coherent X-rays. The proposed laser-driven undulator is expected to produce internal deflection forces equivalent to a severalTesla magnetic field acting on a speed-of-light particle. The key idea for this laser-driven undulator is its ability to provide phase synchronicity between the deflection...

ROTATIONAL ASSIGNMENT OF NEW BANDS IN THE NO , EXCITATION SPECTRUM IN THE SPECTRAL RANGE OF 15600 cm TO 15633 cm

Sub-Doppler excitation spectroscopy in a collimated cold supersonic beam of 5% NO seeded in argon has been performed with a spectral resolution down to 10 MHz for four vibronic bands within the perturbed B ?X A system of NO . The rotational temperature of about 15 K achieved by adiabatic cooling allows the separation of closely lying vibronic bands which overlap in absorption spectra ...

Surgical margins for melanoma: is 2 cm too much?