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  • 1970-1974  (7)
  • 1930-1934
  • 1974  (7)
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  • 1970-1974  (7)
  • 1930-1934
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Dynamic mechanical measurements with the eccentric rotating disks flow (1974)
    Springer
    Rheologica acta 13 (1974), S. 814-829 
    Details
    ISSN: 1435-1528
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Summary The forces generated by flow between eccentric rotating disks (ERD) are examined experimentally. ERD experiments are presented for severalNewtonian and viscoelastic fluids with viscosities ranging from 30 to 240 000 poise. The effects of disk separation, radius, misalignment, and eccentricity are studied. ERD data is compared to the dynamic shear moduli,G′ andG″, defined by small amplitude deformation in oscillatory shear flow. Results confirm theory that the two measurable shear forces generated in the ERD do measureG′ andG″. No significant boundary or inertial effects were noted, but in some cases instrument compliance can be significant. Normal stress measurements in the ERD are also reported.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01527079
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 2
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    The application of acoustic emission technique to fatigue crack measurement (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The applicability of acoustic emission technique to measure fatigue cracks in aluminum alloy specimens was investigated. There are several variables, such as the metallurgical and the physical treatment of the specimen, that can affect the level of acoustic activity of a fatigue specimen. It is therefore recommended that the acoustic emission technique be supplemented by other nondestructive evaluation methods to obtain quantitative data on crack growth.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-TN-D-7695 , L-9530
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 3
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    Comparison of inert-gas-fusion and modified Kjeldahl techniques for determination of nitrogen in niobium alloys (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: This report compares results obtained for the determination of nitrogen in a selected group of niobium-base alloys by the inert-gas-fusion and the Kjeldahl procedures. In the inert-gas-fusion procedure the sample is heated to approximately 2700 C in a helium atmosphere in a single-use graphite crucible. A platinum flux is used to facilitate melting of the sample. The Kjeldahl method consisted of a rapid decomposition with a mixture of hydrofluoric acid, phosphoric acid, and potassium chromate; distillation in the presence of sodium hydroxide; and highly sensitive spectrophotometry with nitroprusside-catalyzed indophenol. In the 30- to 80-ppm range, the relative standard deviation was 5 to 7 percent for the inert-gas-fusion procedure and 2 to 8 percent for the Kjeldahl procedure. The agreement of the nitrogen results obtained by the two techniques is considered satisfactory.
    Schlagwort(e): MATERIALS, METALLIC
    Materialart: NASA-TM-X-3067 , E-7867
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 4
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    A global magnetic anomaly map (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A subset of POGO satellite magnetometer data has been formed that is suitable for analysis of crustal magnetic anomalies. Using a thirteenth order field model, fit to these data, magnetic residuals have been calculated over the world to latitude limits of plus 50 deg. These residuals averaged over one degree latitude-longitude blocks represent a detailed global magnetic anomaly map derived solely from satellite data. Preliminary analysis of the map indicates that the anomalies are real and of geological origin.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA-TM-X-70628 , X-922-74-98 , NSSDC-ID-65-081A-05-PS , NSSDC-ID-67-073A-06-PS , NSSDC-ID-69-051A-21-PS
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 5
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    Interlaboratory comparison of chemical analysis of uranium mononitride (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Analytical methods were established in which the critical variables were controlled, with the result that acceptable interlaboratory agreement was demonstrated for the chemical analysis of uranium mononitride. This was accomplished by using equipment readily available to laboratories performing metallurgical analyses. Agreement among three laboratories was shown to be very good for uranium and nitrogen. Interlaboratory precision of + or - 0.04 percent was achieved for both of these elements. Oxygen was determined to + or - 15 parts per million (ppm) at the 170-ppm level. The carbon determination gave an interlaboratory precision of + or - 46 ppm at the 320-ppm level.
    Schlagwort(e): CHEMISTRY
    Materialart: NASA-TN-D-7536 , E-7674
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 6
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    Rapid method for determining nitrogen in tantalum and niobium alloys (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Adaptation of commercial instrument which measures nitrogen and oxygen in steel gave results in less than four minutes. Sample is heated in helium atmosphere in single-use graphite crucible. Platinum flux facilitates melting of sample. Released gases are separated chromatographically and measured in thermal-conductivity cell.
    Schlagwort(e): MATERIALS
    Materialart: LEW-12237
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 7
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    Evaluation of acoustic emission technique for crack growth measurement in aeronautical structures (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: An investigation has been conducted concerning the possibility to use the acoustic emission technique for the measurement of fatigue crack growth in aluminum alloy specimens. Two types of aluminum alloys were tested in the investigation. It was found that the acoustic emission technique provides a reliable indication of changes in the crack dimensions over relatively short periods of time. The level of acoustic activity serves as an indicator of the size of the cracks.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: International Instrumentation Symposium; May 21, 1974 - May 23, 1974; Albuquerque, NM
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
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