Periodic Golay pairs and pairwise balanced designs

Journal of Algebraic Combinatorics - In this paper we exploit a relationship between certain pairwise balanced designs with v points and periodic Golay pairs of length v, to classify periodic Golay...     

1-Chloro-2-deoxy-3,5-di-p-toluoyl-D-erythro-pentosyl Chloride - A Versatile Synthetic Intermediate

Syntheses of 1b-d is described using 1-chloro-2-deoxy-3,5-di-p-toluoyl-D-erythro-pentosyl chloride.     

Scanning tunneling microscopy and spectroscopy of the semi-insulating CdZnTe(110) surface

The morphology and electronic structure of the (110) surface of semi-insulating CdZnTe has been studied by scanning tunneling microscopy and spectroscopy. The surface shows a 1 × 1 reconstruction whilst the tunneling spectra are highly rectified implying that imaging could only be performed at negative sample bias. Theoretical computations of the tunnel current have been used to fit to experiment to reveal the origin of each tunneling component and explain the rectification observed. The implications of various surface defects and surface states are considered. A discussion on scanning tunneling microscopy and spectroscopy on semi-insulating materials in general is also given.     

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Ohne Zusammenfassung     

The endogenous GABA analogue gamma-hydroxybutyric acid: Tritium labeling at high specific activity

2,3,4-³H] Gamma-hydroxybutyric acid (GHB, 4) was prepared by means of a catalytic tritium reduction of 2(5H)-furanone (2) followed by hydrolysis. It has proven useful as a tool to study the GHB receptor. This revised version was published online in July 2006 with corrections to the Cover Date.     

On the design of broadband quasioptical systems for submillimeter-wave radio-astronomy receivers

In this paper, we summarize the issues that should be considered when designing broadband quasioptical systems for submillimetre-wave radioastronomy receivers. We cover topics such as bandwidth, cross-talk, truncation, and aberrations, and we argue that it should be possible to manufacture high-efficiency systems that have several octaves of bandwidth. A key feature of the paper is that we use the language of multimode Gaussian optics throughout, and in this way, we emphasize that a receiver is a diffraction-limited imaging system rather than just a collection of components for guiding Gaussian beams. The whole discussion is conducted in terms of a particular system we are constructing for the James Clerk Maxwell Telescope in Hawaii.