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  • Polymer and Materials Science  (5)
  • AIR TRANSPORTATION AND SAFETY  (1)
  • FACILITIES, RESEARCH, AND SUPPORT  (1)
  • Man/System Technology and Life Support
  • 1975-1979  (3)
  • 1970-1974  (4)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Characterization of the A ⇄ B transition of DNA in fibers and gels by laser Raman spectroscopy (1975)
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 1245-1257 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Both Raman spectra and X-ray diffraction patterns have been obtained from oriented fibers of sodium deoxyribonucleic acid (Na-DNA) as a function of salt content and relative humidity. We have confirmed the previously reported X-ray results that, for oriented fibers, the A-form always exists between 75 and 92% relative humidity and that the conformation will change to the B-form at 92% relative humidity only if an excess (3-5%) of added salt is present. Oriented fibers containing low amounts of added salt remain in the A-type conformation at 92% relative humidity and higher. An exact correlation has been found between the familiar A- and B-type X-ray diffraction patterns of DNA fibers and the Raman spectra previously reported without X-ray verification from this laboratory for the A- and B-forms. In particular, a band at 807 cm-1 was always present when a fiber showed the A-type diffraction pattern, and this band shifts to 790 cm-1 in the B-form. Using the Raman spectrum to determine the specific conformation of DNA in samples less amenable to X-ray analysis, we have studied the A ⇄ Btransformation in unoriented fibrous masses of DNA and in concentrated, oriented gels. We find that in unoriented fibrous masses, the A ⇄ B transition always occurs at 92% relative humidity even at very low salt concentration (0-4%). However, in oriented DNA gels at low salt, the A-form can persist as a metastable state to concentration as low as 20% DNA. The origin of the bands at 807 and 790 cm-1 and the possible biological implications of these findings are discussed.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1975.360140613
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Neue Erkenntnisse auf dem Gebiet der ferritischen rostfreien Stähle (1970)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 21 (1970), S. 336-342 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Recent developments in ferritic stainless steelsThe pitting resistance of ferritic stainless steels in HCl is visibly improved by Mo, in particular in the case of vacuum-melted material. In this context the ratio Cr:Mo = 25:2 is superior ta Cr:Mo = 17:3; addition of Mo prevents, beyond that, crevice corrosion. Ti increases resistance in the Strauß test but not in the Huey test, while Nb turns out to have a positive effect in either test. Steels containing Cr: Mo = 17:l are certainly still susceptible to pitting, but no longer to stress corrosion cracking in boiling MgCl2, solution; stress corrosion cracking is not observed in 55% boiling Ca(NO3)2, and 25% boiling NaOH, but after annealing at 980 °C intercrystalline corrosion takes place. The test duration required for establishing cracking susceptibility is considerably shorter with ferritic than with austenitic steels (100 and 1000 to 2000 hours respectively).
    Notes: Die Beständigkeit von nichtrostenden ferritischen Stählen gegen Lochfraß in HCl wird durch Mo deutlich verbessert, besonders, wenn es sich un vakuumerschmolzenes Material handelt. Hierbei ist die Kombination Cr :Mo 25 :2 besser als 17:3; der Mo-Zusatz verhindert außerdem Spaltkorrosion. Ti erhöht die Beständigkeit im Strauß-Test, nicht hingegen im Huey-Test, während Nb sich in beiden Medien als günstig erweist. Stäble mit Cr:Mo 17:l sind zwar noch anfällig fur Lochfraß, nicht mehr hingegen für Spannunnsrißkorrosion in kochendem MgCl2; auch in kochendem Ca-Nitrat (55%) oder NaOH (25%) tritt keine Spannungsrißkorrosion auf; doch wird nach Glühen bei bei 980°C interkristalline Korrosion beobachtet. Die zur Prüfung der Rißbildungsneigung erforderliche Versuchsdauer ist für die ferritischen Stähle wesentlich kürzer als für austenitische (100 gegen 100 bei 2000 Std).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19700210505
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  • 3
    Electronic Resource
    Electronic Resource
    Corrosion resistance and mechanical properties of nickel-bearing ferritic stainless steels (1977)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 28 (1977), S. 536-543 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Korrosinsbeständigkeit und mechanische Eigenschaften von nickelhaltigen ferritischen stählenZusatz von nickel zu ferritischen Stählen mit 25-28% Cr und 2-4% Mo verbessert die Schlagzähigkeit, vor allem bei Ni-Gehalten oberhalb 2%. Die Wirkung des Nickels nimmt bis zur untersuchten Obergrenze (4%) zu. Niobstabilisierte Stähle haben niedrigere Übergangstemperaturen als entsprechende titanstabilisierte. Stähle mit 4% Nickel müssen bei 1050°C angelassen werden, um Bildung intermetallischer Verbindungen zu vermeiden. Ferner wurde beobachte, dß Nickel die obere Schwellenenergie bei der Kerbschlagprüfung nach Charpy verringert und den scharfen Überzug zäh/spröd aus schalter. Ein deutlicher Einfluß des Nickels auf das Lochkorrosionspotential wurde nicht festgestellt; die Stähle in der Reihe 25 Cr-3,5 Mo-Ni--Ti hatten jedoch durchweg edlere Lochkorrosionspotentiale und besser Spaltkorrosionsbeständigkeit als die Stähle mit 28Cr und 2Mo (Ni Ti) Die Spaltkorrosionsbeständigkeit wird durch 1 order 2% Nickel verbessert, während höhere Gehalte ungünstig zu sein scheinen. Die kritische Passivierungsstromdichte in 1 n Schwefel-und Salzsäure wird durch Nickel stark verringert, weshalb die Beständigkeit dann erhöht ist. Durch 1% Nickel werden die angelassenen Stähle anfällig für Spannungsrißkorrosion in Magnesiumchloridlösung bei 140°C, während geschweißte Stähle mit 4% Nickel in siedender 25%tiger Natriumchloridlösung bei pH l Keine Rißbildung aufweisen.
    Notes: Additions of nickel to ferritic steels containing 25-28% Cr and 2-4% Mo increased the impact toguhness especially when more than 2% Ni was present. The effect of nickel content increased up to 4% Ni, the largest addition studied. Steels stabilized with niobium had lower transition temperatures then did corresponding steels stablizied with titanium. Steels containing 4% Ni required annealing at 1050 C to avoid intermetalic compounds. It was also noted that nickel reduced the upper shelf energy in the Charpy impact test and eliminated a sharp transition from ductile to brittle behaviour.No definite effect of nickel on pitting potential was pound but steels in the series 25Cr-3.5 Mo-Ni-Ti consistenly had more noble pitting potentials and greater resistance to crevice corrosion than the 28 Cr-2Mo-Ni-Ti steels. Nickel contents of 1 or 2% tended to improve crevice corrosion resistance while larger nickel contents were somewhat ditrimental. Nickel strongly reduced critical current densities for passivity both in l N H2SO4 and in l N HCL and yielded corresponding increases in resistance to corrosion by these acids. Although 1% Ni or more caused the annealed steels to be susceptible to stress corrosion cracking in MgCl2 boiling at 140 C, while the as-Welded steels containing 4% Ni did not crack in boiling 25% Nacl at pH 1.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19770280804
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of precipitating polymer on the rates of vinyl polymerization initiated by the cupric sulphate-hydrazine system (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 9 (1971), S. 1777-1778 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.150090630
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  • 5
    Electronic Resource
    Electronic Resource
    Study of the kinetics of the polymerization of N-vinyl pyrrolidone by viscometry (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 9 (1971), S. 1775-1775 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.150090629
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  • 6
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    Study of the impact of cruise speed on scheduling and productivity of commercial transport aircraft (1977)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A comparison is made between airplane productivity and utilization levels derived from commercial airline type schedules which were developed for two subsonic and four supersonic cruise speed aircraft. The cruise speed component is the only difference between the schedules which are based on 1995 passenger demand forecasts. Productivity-to-speed relationships were determined for the three discrete route systems: North Atlantic, Trans-Pacific, and North-South America. Selected combinations of these route systems were also studied. Other areas affecting the productivity-to-speed relationship such as aircraft design range and scheduled turn time were examined.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: NASA-CR-145189 , LR-28114
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    The design of components for an advanced Rankine cycle test facility. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The design of a facility for testing components of an advanced Rankine cycle power system is summarized. The facility is a three-loop system in which lithium, potassium and NaK-78 are the working fluids of the primary, secondary and heat-rejection loops, respectively. Design bases and performance predictions for the major loop components, including the lithium heater and the potassium boiler, condenser and preheater, are outlined.
    Keywords: FACILITIES, RESEARCH, AND SUPPORT
    Type: Intersociety Energy Conversion Engineering Conference; Energy 70; Sep 21, 1970 - Sep 25, 1970; Las Vegas, NV
    Format: text
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    NASA TECHNICAL REPORTS
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