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In batch and continuous experiments, the influence of NH4 |post|staggered|+-N on anaerobic digestion of liquid piggery manure was investigated. The source of nitrogen as well as its concentration influenced the fermentation. By means of pH-controlled operation and a suitable choice of temperature, inhibitory effects of NH4 |post|staggered|+-N could be(More)
We briefly consider some design aspects of aperture arrays for use in radio astronomy, particularly contrasting the performance of dense and sparse aperture arrays. Recent insights have emerged in the final design phase of LOFAR which suggest that sparse aperture arrays have the best prospects for cost-effective performance at radio frequencies below about(More)
Copyright 2006 Society of Photo-Optical Instrumentation Engineers. This paper will be published in Chemical and Biological Sensors for Industrial and Environmental Monitoring II, edited by S.D. Christesen, A. J. Sedlacek, J. B. Gillespie, K. J. Ewing, Proceedings of SPIE 6378, 2006, and is made available as an electronic preprint with permission of SPIE.(More)
A sample of large northern Spitzer Infrared Nearby Galaxies Survey (SINGS) galaxies has recently been observed with the Westerbork Synthesis Radio Telescope (WSRT). We present observations of the linearly polarized radio continuum emission in this WSRT-SINGS galaxy sample. Of the 28 galaxies treated in this paper, 21 are detected in polarized radio(More)
We present an overview of the occurrence and properties of atomic gas associated with compact radio sources at redshifts up to z = 0.85. Searches for H i 21 cm absorption were made with the Westerbork Synthesis Radio Telescope at UHF-high frequencies (725–1200 MHz). Detections were obtained for 19 of the 57 sources with usable spectra (33%). We have found a(More)
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Context. We have obtained Herschel images at five wavelengths from 100 to 500 μm of a ∼5.5 × 2.5 degree area centred on the local galaxy M 31 (Andromeda), our nearest neighbour spiral galaxy, as part of the Herschel guaranteed time project “HELGA”. The main goals of HELGA are to study the characteristics of the extended dust emission, focusing on larger(More)
Context. Since 2004 we have been carrying out a pulsar survey of the Cygnus region with the Westerbork Synthesis Radio Telescope (WSRT) at a frequency of 328 MHz. The survey pioneered a novel interferometric observing mode, termed 8gr8 (eight-grate), whereby multiple simultaneous digital beams provide high sensitivity over a large field of view. Aims. Since(More)
We present results on the interstellar medium (ISM) properties of 29 galaxies based on a comparison of Spitzer far-infrared and Westerbork Synthesis Radio Telescope radio continuum imagery. Of these 29 galaxies, 18 are close enough to resolve at 1 kpc scales at 70 µm and 22 cm. We extend the Murphy et al. (2006a,b) approach of smoothing infrared images to(More)