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  • ASTRODYNAMICS  (3)
  • Biochemistry and Biotechnology  (1)
  • Superfluidity and superconductivity
  • 1980-1984  (3)
  • 1975-1979  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Production and utilization of Bacillus thuringiensis (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 22 (1980), S. 1297-1304 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Biological insecticide formulations based on the entomogenous bacterium. Bacillus thuringiensis, have begun to be used widely in agriculture. This spore-forming bacillus can be grown in submerged culture and formulated to provide stable agricultural formulations compatible with aerial and ground application systems. The safety of these products to nontarget organisms and man is responsible for the growing interest in their use on a variety of crops including pastures and forests. No longer a laboratory curiosity, B. thuringiensis is an economic alternative to chemical insecticides.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260220703
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Round-trip missions to low delta-V asteroids and implications for material retrieval (1979)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: Low-delta-V asteroids are to be found among those which have perihelia near 1 AU. From the 50 known asteroids with perihelia less than 1.5 AU, 10 candidates for asteroid retrieval missions were selected on the basis of low eccentricity and inclination. To estimate the ranges of orbital elements for which capture in earth orbit may be feasible, a survey was made of 180 deg transfer from a set of orbits having elements near those of the earth to the earth. For 2 of the 10 low-delta-V asteroids and for an additional one with elements more earth-like than any yet known, direct ballistic round trips in the 1980's were computed. A stay time of several months at the asteroid was used. The results show that the total delta V, including that for rendezvous with earth upon return, for the known asteroids is above 14 km/sec. But if asteroids are found similar to the strawman considered, the total delta V could be as low as 10 km/sec.
    Keywords: ASTRODYNAMICS
    Type: NASA. Ames Res. Center Space Resources and Space Settlements; p 161-172
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Optimal orbital transfers and prime rib curves for mission design (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Battin's work on optimal one impulse transfers from circular orbits is extended. Optimal one impulse trajectories from orbits of arbitrary eccentricity through a specified point are determined. This work is then further extended to optimal two impulse transfers between massive planets. Curves derived using this technique are presented showing flyby and rendezvous Delta V requirements for all combinations of launch and arrival true anomalies. Similar curves for times of flight corresponding to the trajectories with minimum total Delta V are derived using Lambert's methods. Possible further extension of these techniques are outlined. The use of these curves for mission design is presented in a companion paper by Hulkower and Ross (1971).
    Keywords: ASTRODYNAMICS
    Type: AIAA PAPER 81-0313 , Aerospace Sciences Meeting; Jan 12, 1981 - Jan 15, 1981; St. Louis, MO
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Material capture by double lunar gravity assist (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The equations yielding the performance of a single lunar flyby in removing incoming hyperbolic excess velocity to capture payloads on interplanetary trajectories are briefly derived. The impossibility of using a single lunar flyby to capture a body entering the earth-moon system with a hyperbolic velocity in excess of about 1.9 km/s is discussed, and a method of using a double flyby of the moon to significantly improve this performance is developed. The equations for achieving a double lunar flyby are derived by solving the orbital equations and Lambert's problem both for the incoming trajectory in the plane of the moon's orbit and for arbitrary declination. For the in-plane case it is shown that the maximum removable hyperbolic excess velocity is 2.2687 km/s. For the inclined case, it is shown that the use of a double lunar flyby allows capture for declinations in excess of 54 degrees, and that for declinations less than 38 degrees the double lunar flyby offers better performance than the single lunar flyby.
    Keywords: ASTRODYNAMICS
    Type: AIAA PAPER 80-1673 , Astrodynamics Conference; Aug 11, 1980 - Aug 13, 1980; Danvers, MA
    Format: text
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    NASA TECHNICAL REPORTS
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