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We define here a new symmetry operator called reciprocation. Apertures that remain unchanged afler reciprocation are called self-reciprocal, and have a number of unique properties. When excited suddenly by a voltage, a self-reciprocal aperture becomes an antenna. This antenna is an approximation to a TEM horn, to a lens IRA (TEM feed + lens), or to a reflector IRA (TEM feed + reflector). Becaus...

Measurement of the time delay between multiple images of a gravitational lens system is potentially an accurate method of determining the Hubble constant over cosmological distances. One of the most promising candidates for an application of this technique is the system B0218+357 which was found in the Jodrell Bank/VLA Astrometric Survey (JVAS). This system consists of two images of a compact r...

volume 121 | number 5 | May 2013 • Environmental Health Perspectives Erratum: Williams et al. “RDX Binds to the GABAA Receptor–Convulsant Site and Blocks GABAA Receptor–Mediated Currents in the Amygdala: A Mechanism for RDX‐Induced Seizures” [119:357–363 (2011)] In Figure 2 of the paper by Williams et al. [Environ Health Perspect 119:357–363 (2011)], the units for “Brain RDX concentration” (y‐a...

We have detected the J = 4 ← 3 rotational transition of CO in absorption at z = 0.89 towards the quasar PKS 1830−211, but not the CO (5 ← 4) or the P1 ← 3 P0 fine structure line of neutral carbon. The intervening molecular medium thus has a total CO column density of 10 cm ≤ N(CO) ≤ 5×10 cmwith a most likely value of N(CO) ≃ 2×10 cm, which corresponds to the large column density of molecular hy...

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