منابع مشابه
Radiant distribution of micrometeors
Precise knowledge of the angle between the meteor vector velocity and the radar beam axis is one of the largest source of errors in the Arecibo Observatory (AO) microme-teor observations. In this paper we study ∼250 high signal-to-noise ratio (SNR) meteor head-echoes obtained using the dual-beam 430 MHz AO Radar in Puerto Rico, in or-5 der to reveal the distribution of this angle. All of these ...
متن کاملDependence of calculus retropulsion dynamics on fiber size and radiant exposure during Ho:YAG lithotripsy.
During pulsed laser lithotripsy, the calculus is subject to a strong recoil momentum which moves the calculus away from laser delivery and prolongs the operation. This study was designed to quantify the recoil momentum during Ho:YAG laser lithotripsy. The correlation among crater shape, debris trajectory, laser-induced bubble and recoil momentum was investigated. Calculus phantoms made from pla...
متن کاملRadiant Energy and the Eye
Ophthalmology Series. (Pp 321, Figs 167, Tables 41. £25.00). London: Bailliere Tindall, 1980. THIS well presented and well organised book discusses the known and potential effects and hazards of radiant energy on the eye. It admirably correlates current scientific knowledge concerning radiant erergy with its biological effects on ocular structures and documents the various mechanisms whereby v;...
متن کاملNuclear Matter and Nuclear Dynamics
1. Introduction The Equation of State (EOS) of nuclear matter plays a fundamental role in the understanding of many aspects of nuclear physics and astrophysics. Transient states of nuclear matter far from normal conditions can be created in terrestrial laboratories and many experimental and theoretical efforts have been devoted to the study of nuclear reactions, from low to intermediate energie...
متن کاملChiral Dynamics and Nuclear Matter
We calculate the equation of state of isospin-symmetric nuclear matter in the threeloop approximation of chiral perturbation theory. The contributions to the energy per particle Ē(kf ) from oneand two-pion exchange diagrams are ordered in powers of the Fermi momentum kf (modulo functions of kf/mπ). It is demonstrated that, already at orderO(k4 f ), two-pion exchange produces realistic nuclear b...
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ژورنال
عنوان ژورنال: Nature
سال: 1881
ISSN: 0028-0836,1476-4687
DOI: 10.1038/023483b0