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  • Chemical Engineering  (43)
  • STRUCTURAL MECHANICS  (36)
  • ASTRONOMY
  • Life and Medical Sciences
  • 1995-1999
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  • 1970-1974  (127)
  • 1960-1964
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  • 1974  (127)
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  • 1995-1999
  • 1980-1984
  • 1970-1974  (127)
  • 1960-1964
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  • 1
    Digitale Medien
    Digitale Medien
    Turbulent drag reduction in fiber-polymer systems: Specificity considerations (1974)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 20 (1974), S. 1218-1219 
    Details
    ISSN: 0001-1541
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aic.690200626
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    Artikel (Nationallizenzen)
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  • 2
    Digitale Medien
    Digitale Medien
    Effect of phase-volume ratio and phase-inversion on viscosity of microemulsions and liquid crystals (1974)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 20 (1974), S. 510-514 
    Details
    ISSN: 0001-1541
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Microemulsions, which are optically transparent oil-water dispersions, were spontaneously produced upon mixing hexadecane, hexanol, potassium oleate, and water in specific proportions. The viscosity of the microemulsions was measured for several water/oil ratios including the phase-inversion region. The striking optical and viscosity changes observed at specific water/oil ratios were in agreement with the proposed mechanism of phase-inversion, namely, water spheres → water cylinders → water lammellae → continuous water phase, for this system. In the phase-inversion region, the dispersion exhibited birefringence and rheopectic properties. An extremely high viscosity (〉 100,000 cps) exhibited by the dispersions between water/oil ratios of 2.0 and 3.5 were explained in terms of ion-dipole association between oleate and hexanol molecules on adjacent droplets.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aic.690200311
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  • 3
    Digitale Medien
    Digitale Medien
    Lithography and radiation chemistry of epoxy containing negative electron resists (1974)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 14 (1974), S. 529-533 
    Details
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: A class of negative electron-beam resists is described which have excellent lithographic characteristics. The resists are copolymers of glycidyl methacrylate and ethyl acrylate. Their molecular weights, epoxy contents, and polydispersivities can be controlled to give an adjustable range of electron sensitivity and contrast. The copolymers are compared to other epoxy containing, negative electron-beam resists.Micrography of resist profiles generated from a single line scan of the electron beam have been used to illustrate the complex interaction of accelerating voltage of the electron beam and resist contrast on resolution. Optical gratings made from single line scans of the beam have feature sizes less than 300 nm in the resist, etched metals, and dielectrics.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pen.760140713
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  • 4
    Digitale Medien
    Digitale Medien
    Nature of fatigue behavior and effect of flaw size in polystyrene (1974)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 14 (1974), S. 801-805 
    Details
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Fatigue tests under reversed tension-compression have been made on polystyrene specimens in both the unnotched and notched condition. For the notched specimens subject to a stress amplitude of 2500 psi, the log of the fatigue life was found to be a linear function of the log of the notch size. From the data, it was possible to determine an inherent flaw size for polystyrene subject to alternating loading and this value is compared to corresponding values obtained from static tests. Fracture surfaces were examined by scanning electron microscopy and the changes produced by notching are discussed.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pen.760141112
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  • 5
    facet.materialart.
    Unbekannt
    High resolution spectrophotometry of selected features in the 1.1 micron spectrum of Comet Kohoutek /1973f/ (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Fabry-Perot interferometry of Comet Kohoutek (1973f) at 1.1 microns with a resolution of 1.2 A showed emission features identified as OH and CN lines in addition to a strong Fraunhofer continuum. Central intensities have been derived for three cases (uniform, Gaussian, and Gaussian plus inverse-rho law) of brightness profiles in the comet coma. Limits for CH4, H2O, HeI, SiI and CrI are also derived.
    Schlagwort(e): ASTRONOMY
    Materialart: Icarus; 23; Nov. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
    facet.materialart.
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    Rocket-ultraviolet spectra of kappa, lambda, tau, and upsilon Scorpii (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The present work describes high- and low-resolution rocket-ultraviolet spectra of kappa, lambda, tau, and upsilon Scorpii obtained in the range from 1160 to 1880 A. The Si IV resonance lines in tau Sco show asymmetries indicating outward mass motions of up to about 400 km/sec. The suitability of some of the lines observed for indication of luminosity or temperature is discussed. It is pointed out that the intrinsic strength and large changes of the lines of Si III and C IV may permit a more accurate spectral classification of stars between B0 and B3 than has been demonstrated in this same spectral type region using visible spectra.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; 194; Nov. 15
    Format: text
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  • 7
    facet.materialart.
    Unbekannt
    Application of boundary integral method to elastoplastic analysis of V-notched beams (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The boundary integral equation method was applied in the solution of the plane elastoplastic problem. The use of this method was illustrated by obtaining stress and strain distributions for a number of specimens with a single-edge notch and subjected to pure bending. The boundary integral equation method reduced the inhomogeneous biharmonic equation to two coupled Fredholm-type integral equations. These integral equations were replaced by a system of simultaneous algebraic equations and solved numerically in conjunction with a method of successive elastic solutions.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-TN-D-7637 , E-7658
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
    facet.materialart.
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    Theory to test comparisons for selected aerospace multishell structures and their interfaces under thermomechanical loadings (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Guidelines for structural shell analyses were obtained on the basis of theory-to-test comparisons made on two large-scale aerospace structures subject to thermomechanical loads. The first structural test was the cylindrical aluminum skin-stringer-ring construction of the S-IC forward skirt and S-II interstage. The second structural test included the truncated, cone-shaped, bonded honeycomb sandwich shell of the Spacecraft Lunar Module Adapter; the cylindrical bonded aluminum honeycomb sandwich construction of the Instrument Unit; and the skin-stringer construction with rings and intercostals of the S-IVB forward skirt. Analyses were made for loadings simulating the flight environment. Elementary shear lag theory was superimposed on shell analysis for interface junctions between stages to obtain favorable theory-to-test stress comparisons.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: AIAA PAPER 74-1270 , Canadian Aeronautics and Space Institute and American Institute of Aeronautics and Astronautics, Joint Meeting, Toronto; Oct 30, 1974 - Oct 31, 1974; Toronto; Canada
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
    facet.materialart.
    Unbekannt
    A comparison of lyman alpha and He lambda 10830 line structures and variations in early-type star atmospheres (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Line profiles were first obtained at maximum velocity separation of the spectroscopic binary Spica (alpha Vir), and then high resolution spectrophotometric images of selected features in the 1.1 micron spectrum of Comet Kohoutek were obtained in order to gain insight into the structures and variations in early-type star atmospheres.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA-CR-140572
    Format: application/pdf
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  • 10
    facet.materialart.
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    A numerical-perturbation method for the nonlinear analysis of structural vibrations (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: A numerical-perturbation method is proposed for the determination of the nonlinear forced response of structural elements. Purely analytical techniques are capable of determining the response of structural elements having simple geometries and simple variations in thickness and properties, but they are not applicable to elements with complicated structure and boundaries. Numerical techniques are effective in determining the linear response of complicated structures, but they are not optimal for determining the nonlinear response of even simple elements when modal interactions take place due to the complicated nature of the response. Therefore, the optimum is a combined numerical and perturbation technique. The present technique is applied to beams with varying cross sections.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: AIAA PAPER 74-104 , Aerospace Sciences Meeting; Jan 30, 1974 - Feb 01, 1974; Washington, DC
    Format: text
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