Mapping and monitoring observations of SiO maser sources near the Galactic center were made with the Nobeyama 45-m telescope at 43 GHz. Rectangular mapping an area of approximately 200 × 100 in a 30 grid, and triangular mapping in a 20 grid toward the Galactic center, resulted in 15 detections of SiO sources; the positions of the sources were obtained with errors of 5–10, except for a few weak ...

Yb3+-doped phosphate glasses containing different amounts of SiO₂ were successfully synthesized by the conventional melt-quenching method. The influence mechanism of SiO₂ on the structural and spectroscopic properties was investigated systematically using the micro-Raman technique. It was worth noting that the glass with 26.7 mol % SiO₂ possessed the longest fluorescence lifetime (1.51 ms), the...

We have surveyed 401 color selected IRAS sources in the Galactic disk in the SiO J = 1–0 v = 1 and 2 maser lines at 43 GHz, resulting in 254 (239 new) detections. The observed sources lie mostly in a strip of the inner Galactic disk with boundaries −10 < l < 40 and |b|< 3. This survey provides radial velocities of inner-disk stars for which optical measurements cannot be made due to interstella...

High angular resolution Australia Telescope Compact Array (ATCA) observations of SiO ‘thermal’ millimetre line emission towards the two oxygen-rich, low mass loss rate AGB stars R Dor and L Pup are presented. In both cases the emission is resolved with an overall spherical symmetry. Detailed radiative transfer modelling of the SiO line emission has been performed, and the comparison between obs...

An unexpected oxygen-assisted reduction of cationic Au species by CO was found on a Au/SiO(2) catalyst at room temperature and the produced metallic Au species plays an essential role in CO oxidation on Au/SiO(2).

In the paper an approach to analysis of the structure of repositories based on network analysis is proposed. The repository metadata can be transformed into several (one-mode or two-mode) networks. Using the methods of network analysis interesting substructures in these networks can be detected. The proposed approach is illustrated with some analyses of SIO (Slovenian Educational Network) repos...

The degradation of SiO, coatings deposited on alloys by metal organic chemical vapour deposition (MOCVD) in sulphidizing high-temperature environments is determined by delamination and crack formation. With increasing water concentration during deposition, the crack density in silica decreases and the critical thickness for delamination of SiO, coatings increases. This improvement is supposed t...

Context. The detection of a narrow SiO line emission toward the young shocks of the L1448-mm outflow has been interpreted as a signature of the magnetic precursor of C-shocks. In contrast with the very low SiO abundances (≤10−12) derived from the ambient gas, the narrow SiO emission in the precursor component at almost ambient velocities reveals enhanced SiO abundances of ∼10−11. This enhanceme...

Aims. The main aim is to derive reliable mass-loss rates and circumstellar SiO abundances for a sample of 40 S-type AGB stars based on new multi-transitional CO and SiO radio line observations. In addition, the results are compared to previous results for M-type AGB stars and carbon stars to look for trends with chemical type. Methods. The circumstellar envelopes are assumed to be spherically s...

We present a complete SiO v = 0 J = 2 → 1 synthesis image of the red-shifted outflow lobe from the Class 0 protostar L 1448-mm. The image is a 5-field mosaic obtained with the IRAM interferometer at ∼3′′ angular resolution. The SiO emission arises in a highly-collimated jet extending over 0.2 pc. The jet consists of fourmain blobs, probably corresponding to successive episodes of mass-loss from...