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  • 1
    Electronic Resource
    Electronic Resource
    A flueric respiratory and anesthetic gas analyzer (1982)
    Springer
    Annals of biomedical engineering 10 (1982), S. 83-96 
    Details
    ISSN: 1573-9686
    Keywords: Fluidic gas sensor ; Flueric sensors ; Jet-edge resonator oscillator ; Fluidic oscillator sensor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract A unique fluidic-electronic system utilizing flueric jet-edge resonator oscillator sensors has been developed to continuously measure concentrations of oxygen, carbon dioxide, halothane, enflurane, and nitrous oxide in respiratory and anesthetic gases. The sensing unit consists of two flueric jet-edge resonator oscillators operating in parallel. At a constant geometry, flow rate, and temperature, the frequency generated by these oscillators is a function of the molecular weight and specific heat of the gases flowing through them. Oscillator frequencies are detected by pressure transducers. These transducer signals are processed and converted electronically to a.d.c. voltage which is calibrated and displayed in units of constituent concentrations per voltage. The change in frequency of the sensing unit is linear for CO2 and O2 in air and for CO2, N2O, halothane, and enflurane in oxygen. The sensitivity of the sensors is approximately 65 Hz/%CO2 and 20 Hz/%O2 when referenced against air. For these same sensors, sensitivities for CO2, N2O, halothane, and enflurane are approximately 55 Hz/%CO2, 45 Hz/%N2O, 680 Hz/% halothane, and 790 Hz/%enflurane when referenced against oxygen. Time response for the sensor system is 450±10 msec from zero to 90% full scale.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02367000
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    Paper (German National Licenses)
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  • 2
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    The effect of Rhizobium inoculation on white clover in improved hill soils in the United Kingdom (1982)
    Cambridge University Press
    Details
    Publication Date: 1982-12-01
    Description: SUMMARYThe benefits to establishment and growth of white clover cvs Aberystwyth S.184 and Grasslands Huia of inoculation with three strains of Rhizobium trifolii, using the peat or liquid inoculum techniques, were investigated during 1975–8 on improved hill soils ranging from brown earth through dry and wet peaty podzol to deep peat.Inoculation induced positive response in either number of seedlings, plant cover or dry-matter production in 18 out of 139 comparisons, had no effect in 118 and produced a negative response in three. Most of the positive responses to inoculation were at sites with wet peaty podzol or deep peat soils but of the five sites where increase in clover D.M. production was found in the first harvest year one was a brown earth. The positive agronomic responses occurred only when the proportion of plants with nodules was high and where a substantial proportion ( 〉 50%) of the latter contained introduced Rhizobium strains at least in the year of sowing. The three negative responses were in numbers of seedlings on one brown earth and two dry peaty podzol soils and with the Huia cultivar only. Despite lack of statistical significance at individual sites the dominant overall trend was for inoculation to enhance seedling establishment and the early growtli of white clover in all soil types.On one brown earth and one dry peaty podzol soil there was some evidence that spraying the Rhizobium on to emerging white clover seedlings was more beneficial, atleast in microbiological terms, than the customary peat inoculum procedure.The incorporation of even a small amount of nitrogen (30 kg/ha) into the seed bed at the time of sowing adversely affected germination, establishment and growth of white clover in some soils. Sometimes the effects of this nitrogen persisted into the first harvest year.
    Print ISSN: 0021-8596
    Electronic ISSN: 1469-5146
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Cambridge University Press
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