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  • GEOPHYSICS  (354)
  • ENERGY PRODUCTION AND CONVERSION  (176)
  • Biochemistry and Biotechnology
  • 1995-1999
  • 1980-1984  (613)
  • 1983  (258)
  • 1981  (355)
Sammlung
Schlagwörter
Verlag/Herausgeber
Erscheinungszeitraum
  • 1995-1999
  • 1980-1984  (613)
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Cultivation of a filamentous mold in a glass pilot-scale airlift fermentor (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 23 (1981), S. 863-877 
    Details
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Results of pilot plant studies using a glass airlift fermentation device (55 liter fermentation volume) have proven the relative merits of such a system in the fermentation of a filamentous mold, Monascus purpureus, on 4% (w/w) starch media. The resultant overall yield of cell mass (Yx/s) of 0.38 was an appreciable increase over the 0.32 obtained with a pilot scale stirred tank fermentor previously studied. Power requirements of the airlift fermentor were approximately 50% of those for the mechanically agitated system. The lack of mechanical shear in the airlift system provides a more gentle environment or the cultivation of organisms than does the high degree of shear prevalent in the mechanically agitated vessels. Mass transfer of oxygen to the aqueous phase of the fermentation volume is improved significantly through use of the airlift device. Mass transfer coefficients in the range of 200 reciprocal hr were obtained to approximately 80 reciprocal hr in the stirred tank fermentor.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260230416
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    Artikel (Nationallizenzen)
    Volltext
  • 2
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    Is there any chlorine monoxide in the stratosphere? (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: A ground-based search for stratospheric 35-ClO was carried out using an infrared heterodyne spectrometer in the solar absorption mode. Lines due to stratospheric HNO3 and tropospheric OCS were detected at about 0.2 percent absorptance levels, but the expected 0.1 percent lines of ClO in this same region were not seen. We find that stratospheric ClO is at least a factor of seven less abundant than is indicated by in situ measurements, and we set an upper limit of 2.3 x 10 to the 13th molecules/sq cm at the 95 percent confidence level for the integrated vertical column density of ClO. Our results imply that the release of chlorofluorocarbons may be significantly less important for the destruction of stratospheric ozone (O3) than is currently thought. Previously announced in STAR as N83-27518
    Schlagwort(e): GEOPHYSICS
    Materialart: Science (ISSN 0036-8075); 221; July 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Characteristics of optical emissions and particle precipitation in polar cap arcs (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Auroral emission features at high geomagnetic latitudes are identified and characterized using simultaneous optical and particle data from the ISIS-2 satellite. Polar cap arcs are identified from two-dimensional geomagnetic transforms of the optical data along with precipitating electron data for the time at which the satellite is on the field line intersecting the arc. No precipitating protons were detected for any of the arc crossings. The precipitations particle characteristics include: (1) an electron energy spectrum with a peak in the range 350-750 eV superposed on a soft spectrum like that observed in polar rain; (2) a normally isotropic pitch angle dependence, with the exception that field-aligned fluxes are observed in association with an inverted 'v' event; and (3) an energy flux range of approximately 0.8-3 erg/(sq cm s). A possible explanation of the observed precipitating particle characteristics is that parallel electric fields are accelerating polar rain type spectra at an altitude of several thousand km.
    Schlagwort(e): GEOPHYSICS
    Materialart: Planetary and Space Science; 31; Feb. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Analysis of DSN software anomalies (1981)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: A categorized data base of software errors which were discovered during the various stages of development and operational use of the Deep Space Network DSN/Mark 3 System was developed. A study team identified several existing error classification schemes (taxonomies), prepared a detailed annotated bibliography of the error taxonomy literature, and produced a new classification scheme which was tuned to the DSN anomaly reporting system and encapsulated the work of others. Based upon the DSN/RCI error taxonomy, error data on approximately 1000 reported DSN/Mark 3 anomalies were analyzed, interpreted and classified. Next, error data are summarized and histograms were produced highlighting key tendencies.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA-CR-164369 , JPL-9950-536 , RCI-TR-005 , LO-726925
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Report of the NASA working group on tropospheric program planning (1981)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Increased understanding of the chemical phenomena occurring in the troposphere was the research goal. Emphasis was placed on tropospheric impact on environmental quality, including public health, agriculture, climate, and weather.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA-RP-1062 , L-13855
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Plasma regimes in the deep geomagnetic tail - ISEE 3 (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The spacecraft remained close to or within a previously unexplored part of the distant (60-220 earth radii) geomagnetic tail nearly continuously from January 1 to March 30, 1983. Analysis of the data reveals that all of the plasma regimes identified previously with near-earth measurements (plasma sheet, low-latitude boundary layer, plasma mantle, lobe, and magnetosheath) remain recognizable in the distant tail. These regimes, however, are found to be intermingled in a more chaotic fashion than near the earth. Within the plasma sheet at approximately 200 earth radii, typical flow velocities are about 500 km/s tailward, considerably higher than in the near-earth plasma sheet. Earthward flow within the plasma sheet is observed occasionally, indicating the temporary presence of a neutral line beyond 220 earth radii. Also found are strong bidirectional electron anisotropies throughout much of the distant plasma sheet, boundary layer, and magnetosheath.
    Schlagwort(e): GEOPHYSICS
    Materialart: Geophysical Research Letters (ISSN 0094-8276); 10; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    A theoretical assessment of the O3/H2O interference problem in the detection of natural levels of OH via laser induced fluorescence (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Theoretical calculations are presented which estimate the possible magnitude of the O3/H2O derived OH interference signal resulting from the use of the laser-induced fluorescence technique in measuring natural levels of tropospheric OH. Critical to this new assessment has been the measurement of the nascent OH quantum state distribution resulting from the reaction O(1D) + H2O yields 2OH, and an assessment of the subsequent rotational relaxation of the OH species when formed in high k levels.
    Schlagwort(e): GEOPHYSICS
    Materialart: Geophysical Research Letters; 8; Jan. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Is there any chlorine monoxide in the stratosphere? (1983)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: A ground-based search for stratospheric 35-ClO was carried out using an infrared heterodyne spectrometer in the solar absorption mode. Lines due to stratospheric HNO3 and tropospheric OCS were detected at about 0.2% absorptance levels, but the expected 0.1% lines of ClO in this same region were not seen. We find that stratospheric ClO is at least a factor of seven less abundant than is indicated by in situ measurements, and we set an upper limit of 2.3x10 to the 13th molecules/sq cm at the 95% confidence level for the integrated vertical column density of ClO. Our results imply that the release of chlorofluorocarbons may be significantly less important for the destruction of stratospheric ozone (O3) than is currently thought.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA-TM-85026 , NAS 1.15:85026
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Assessment of disk MHD generators for a base load powerplant (1981)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Results from a study of the disk MHD generator are presented. Both open and closed cycle disk systems were investigated. Costing of the open cycle disk components (nozzle, channel, diffuser, radiant boiler, magnet and power management) was done. However, no detailed costing was done for the closed cycle systems. Preliminary plant design for the open cycle systems was also completed. Based on the system study results, an economic assessment of the open cycle systems is presented. Costs of the open cycle disk conponents are less than comparable linear generator components. Also, costs of electricity for the open cycle disk systems are competitive with comparable linear systems. Advantages of the disk design simplicity are considered. Improvements in the channel availability or a reduction in the channel lifetime requirement are possible as a result of the disk design.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA-TM-82609 , DOE/NASA/10769-17 , E-849 , Symp. on Engr. Aspects of Magnetohydrodyn.; Jun 15, 1981 - Jun 17, 1981; Tullahoma, TN; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Applicability of advanced automotive heat engines to solar thermal power (1981)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The requirements of a solar thermal power system are reviewed and compared with the predicted characteristics of automobile engines under development. A good match is found in terms of power level and efficiency when the automobile engines, designed for maximum powers of 65-100 kW (87 to 133 hp) are operated to the nominal 20-40 kW electric output requirement of the solar thermal application. At these reduced power levels it appears that the automotive gas turbine and Stirling engines have the potential to deliver the 40+ percent efficiency goal of the solar thermal program.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA-TM-81658 , E-675 , DOE/NASA/1060-4 , SAE Intern. Eng. Congr. and Exposition,; Feb 23, 1981 - Feb 27, 1981; Detroit, MI; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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