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WORK on photovoltalc cells for space use has led to development of a photocell matrix for moire fringe machine control. Thin film cadmium sulphide/copper sulphide heterojunction cells, investigated at IRD as an alternative to silicon 'solar' cells, are fabricated in matrices of 100 and 1000 photovoltaic lines per inch.
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A new method is presented to determine the optimum number and location of monitoring stations in an air pollution network. The selection of the monitoring stations is based on the spatial representativity of the sites. In particular, the spatial coecient of the correlation between the pollutant conc
In this research the use of negative-ion mass spectrometry for the monitoring of oxygencontaining gases has been demonstrated. Electron impact by low-energy electrons of oxygen-containing gases will result in dissociative electron capture forming 0 -By introducing into a negative-ion mass spectromet