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  • 1
    Electronic Resource
    Electronic Resource
    Synthese von kristallin-flüssigen Verbindungen. I. n-Alkyl- und n-Alkoxyderivate des 3-Hydroxy-2,5-diphenyl-pyrazins (1966)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 33 (1966), S. 265-276 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es werden die Synthesen von 2 homologen Reihen des 3-Hydroxy-2,5-diphenyl-pyrazins und 2-Benzoyl-4(5)-phenyl-imidazols beschrieben. p-n-Alkyl- und p-n-Alkoxyphenylglyoxal-hydrate kondensieren unter ammoniakalischen Bedingungen bevorzugt zu den entsprechenden Imidazolylketonen und nur in geringen Ausbeuten zu Hydroxypyrazinen. Die Alkylhomologen des Pyrazins schmelzen ab Äthylderivat zu kristallin-flüssigen Phasen auf, die dem smektischen Typ angehören. Mit wachsenden Flügelgruppen treten Umwandlungspunkte in diesen Phasen auf. Die beiden ersten Glieder der Ätherreihe haben zusätzlich einen nematischen Bereich. Allen Imidazolylketonen fehlen diese Eigenschaften. Der Einfluß der α-ständigen Hydroxygruppe am heterocyclischen Mittelstück der gestreckten Molekeln wird diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19660330508
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dienoligomerisierung. XVI. Nickelkomplexkatalysierte Codimerisierung von isomeren Octatrienen mit EthenDiese Untersuchungen wurden in der Zeit von September 1973 bis Juli 1975 an der Sektion Verfahrenschemie der TH „Carl Schorlemmer“ Leuna-Merseburg durchgeführt. (1980)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 322 (1980), S. 655-662 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dienoligomerization. XVI. Catalytic Codimerization of Isomeric Octatrienes with Ethene by Nickel ComplexesThe isomeric octatrienes (n-octa-1,3c,t,7-triene 1, n-octa-1,3c,6t-triene 2 and 3-methylhepta-1,4t,6-triene 3), which are easily obtained in high yields by transition metal catalysed dimerization of butadiene, react with ethene 4 in the presence of the cationic tetrakis-(triethylphosphite)-nickelhydride complex 5 to the dodimers 3-methylnona-1,4c,t,8-triene 6, 4-vinylocta-2c, 7-diene 7, 3-methyl nona-1,4c,t,7t-triene 8, 4-vinylocta-2c,6t-diene 9, 3,6-dimethylocta-1,4c,t,7-triene 10 and 3-methyl-4-vinylhepta-1,5c-diene 11. The concentration-time dependence and a possible reaction mechanism of the codimerization are discussed and the structure data of the reaction products are reported.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19803220418
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  • 3
    Electronic Resource
    Electronic Resource
    Dienoligomerisierung. XVII. Nickelkomplexkatalysierte Codimerisierung von isomeren Octatrienen mit PropenDiese Untersuchungen wurden von September 1974 bis Juni 1975 an der Sektion Verfahrenschemie der Technischen Hochschule „Carl Schorlemmer“ Leuna-Merseburg durchgeführt. (1980)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 322 (1980), S. 663-668 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dienoligomerization. XVII. Catalytic Codimerization of Isomeric Octatrienes with Propene by Nickel-ComplexesCodimerizations of isomeric n-octa-1,3c,t,7-triene 1, n-octa-1,3c,6t-triene 2 and 3-methylhepta-1,4t,6-triene 3 with propene 4 in the presence of cationic tetrakis-(triethylphosphite)-nickelhydride complex to form 4-methyldeca-1,5t,9-triene 6, 4-isopropenylocta-2c,7-diene 10, 4-methyldeca-1,5t,8t-triene 12, 4-isopropenylocta-2c,6t-diene 16, 3,6-dimethylnona-1,4t,7c,t-trienes 17, 2,3,6,-trimethylocta-1,4t,7-triene 19 and 3-methyl-4-isopropenylhepta-1,5c-diene 22.The influence of the temperature on the reaction and a reaction mechanism is discussed.No codimers from octatrienes and isobutene were formed under the conditions of this work.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19803220419
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  • 4
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    Hematology and biochemical findings of Spacelab 1 flight (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The changes in erythropoiesis in astronauts caused by weightlessness was experimentally studied during the Spacelab 1 flight. Immediately after landing showed a mean decrease of 9,3 percent in the four astronauts. Neither hyperoxia nor an increase in blood phosphate caused the decrease. Red cell survival time and iron incorporation postflight were not significantly different from their preflight levels. Serum haptoglobin did not decrease, indicating that intravascular hemolysis was not a major cause of red cell mass change. An increase in serum ferritin after the second day of flight may have been caused by red cell breakdown early in flight. The space flight-induced decrease in red cell mass may result from a failure of erythropoesis to replace cells destroyed by the spleen soon after weightlessness is attained.
    Keywords: AEROSPACE MEDICINE
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Spacelab 1 hematology experiment (INS103): Influence of space flight on erythrokinetics in man (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An experiment conducted on the 10-day Spacelab 1 mission aboard the ninth Space Shuttle flight in November to December 1983 was designed to measure factors involved in the control of erythrocyte turnover that might be altered during weightlessness. Blood samples were collected before, during, and after the flight. Immediately after landing, red cell mass showed a mean decrease of 9.3 percent in the four astronauts. Neither hyperoxia nor an increase in blood phosphate was a cause of the decrease. Red cell survival time and iron incorporation postflight were not significantly different from their preflight levels. Serum haptoglobin did not decrease, indicating that intravascular hemolysis was not a major cause of red cell mass change. An increase in serum ferritin after the second day of flight may have been caused by red cell breakdown early in flight. Erythropoietin levels decreased during and after flight, but preflight levels were high and the decrease was not significant. The space flight-induced decrease in red cell mass may result from a failure of erythropoiesis to replace cells destroyed by the spleen soon after weightlessness is attained.
    Keywords: AEROSPACE MEDICINE
    Type: NASA-TM-58268 , S-548 , NAS 1.15:58268
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Study of the application of advanced technologies to long-range transport aircraft. Volume 2: Research and development requirements (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Investigations were conducted to evaluate the relative benefits attainable through the exploitation of advanced technologies and to identify future research and development efforts required to permit the application of selected technologies to transport aircraft entering commercial operation in 1985. Results show that technology advances, particularly in the areas of composite materials, supercritical aerodynamics, and active control systems, will permit the development of long-range, high-payload commercial transports operating at high-subsonic speeds with direct operating costs lower than those of current aircraft. These advanced transports also achieve lower noise levels and lower engine pollutant emissions than current transports. Research and development efforts, including analytical investigations, laboratory test programs, and flight test programs, are required in essentially all technology areas to achieve the potential technology benefits.
    Keywords: AIRCRAFT
    Type: NASA-CR-112089
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Feasibility study of the transonic biplane concept for transport aircraft application (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Investigations were conducted to evaluate the feasibility of a transonic biplane consisting of a forward-mounted swept-back lower wing, a rear-mounted swept-forward upper wing, and a vertical fin connecting the wings at their tips. This wing arrangement results in significant reductions in induced drag relative to a monoplane designed with the same span, and it allows for a constant-section fuselage shape while closely matching an ideal area distribution curve for M = 0.95 cruise. However, no significant reductions in ramp weight were achieved for the biplane relative to a monoplane with the same mission capability. Flutter analyses of the biplane revealed both symmetric and antisymmetric instabilities that occur well below the required flutter speed. Further studies will be required to determine if acceptable flutter speeds can be achieved through the elimination of the instabilities by passive means or by active controls. Configurations designed for other missions, especially those with lower Mach numbers and lower dynamic pressures, should be examined since the geometries suitable for those design constraints might avoid the weight penalties and flutter instabilities which prevent exploitation of induced drag benefits for the configuration studied.
    Keywords: AIRCRAFT
    Type: NASA-CR-132462 , LG74ER0077
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Parametric analysis of ATT configurations. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper describes the results of a Lockheed parametric analysis of the performance, environmental factors, and economics of an advanced commercial transport envisioned for operation in the post-1985 time period. The design parameters investigated include cruise speeds from Mach 0.85 to Mach 1.0, passenger capacities from 200 to 500, ranges of 2800 to 5500 nautical miles, and noise level criteria. NASA high performance configurations and alternate configurations are operated over domestic and international route structures. Indirect and direct costs and return on investment are determined for approximately 40 candidate aircraft configurations. The candidate configurations are input to an aircraft sizing and performance program which includes a subroutine for noise criteria. Comparisons are made between preferred configurations on the basis of maximum return on investment as a function of payload, range, and design cruise speed.
    Keywords: AIRCRAFT
    Type: AIAA PAPER 72-757 , American Institute of Aeronautics and Astronautics, Aircraft Design, Flight Test, and Operations Meeting; Aug 07, 1972 - Aug 09, 1972; Los Angeles, CA
    Format: text
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