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  • 1990-1994  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Optimum capacitor ratio in a transversely excited atmospheric CO2 laser (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 71-75 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The performance of a pulsed CO2 laser using the capacitor transfer circuit is generally known to improve with an optimum peaking-to-storage capacitor ratio Cp/Cs which varies from around 0.1 to almost 0.5. There has been no reported attempt to account for precisely the origin of this optimum ratio and the large difference amongst them with different experimental setups. In this paper, the optimum capacitor ratio is shown to depend uniquely on the distributed circuit inductances. This may be understood from a simple consideration of the impedance matching for achieving an optimum power transfer at a quasiconstant E/N ratio into the main discharge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144404
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    A simple two-stage cascading spark gap for ultraviolet preionized transversely excited atmospheric CO2 lasers (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 2584-2587 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A simple trigatron spark-gap chamber is modified to accommodate two cascading high-voltage breakdowns, separated by the time lag of the second spark formation. The time lag is employed as a temporal delay for synchronizing the ultraviolet preionization and the main discharge in the transversely excited atmospheric CO2 laser. Owing to prompt triggering and in situ preionization of the second breakdown, reliable delay up to 500 ns is possible by simply varying the separation of the second spark-gap electrode to that of the first spark gap.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142234
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Public perception towards sewage treatment plants in selected areas in Selangor and Kuala lumpur, Malaysia (1990)
    Springer
    The environmentalist 10 (1990), S. 85-93 
    Details
    ISSN: 1573-2991
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Summary A public perception survey on sewage treatment plants carried out in selected areas in Selangor and Kuala Lumpur revealed several interesting and unexpected findings. The general perception patterns regarding odour, noise and visual impact, suggest that the perceived intensity is a function of the time of adaptation. It was also revealed that pests constitute a serious nuisance, to which adaptation was not possible. The level of public awareness regarding sewage treatment was surprisingly low, despite the urban locality of the study areas. The need to educate the public on health and sanitation is viewed as extremely important in terms of social acceptance and the proper operation of sewage treatment plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02244386
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A comparison of different culture methods for hybridoma propagation and monoclonal antibody production (1990)
    Springer
    Cytotechnology 4 (1990), S. 69-76 
    Details
    ISSN: 1573-0778
    Keywords: hybridoma ; monoclonal ; productivity ; batch ; continuous ; perfusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A major variable to consider in the production of biologicals from mammalian cell cultures is the mode of operation, be it a batch, continuous, perfusion, fed-batch or other production method. The final choice must consider a number of fundamental and economic issues. Here we present some antibody production data from different cell lines using different modes of production and discuss the important factors for consideration in choosing a production strategy. It was found that the productivity of batch cultures was lower than that obtained in continuous and perfused cultures, but that productivity could be improved by implementing suitable feeding strategies. The antibody productivity of one cell line, MCL1, during exponential phase was not affected by media type or glucose level. The maximum productivity of two cell lines in continuous culture was found to occur at dilution rates below the maximum, from 0.019 to 0.030 hr−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148812
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    Paper (German National Licenses)
    Fulltext
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