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  • NONMETALLIC MATERIALS  (3)
  • Organic Chemistry  (3)
  • 68.35  (1)
  • 2020-2021
  • 1990-1994  (7)
  • 1960-1964
  • 1
    Electronic Resource
    Electronic Resource
    Wavelength-dependent anisotropy of surface second-harmonic generation from Si(111) in the vicinity of bulk absorption (1994)
    Springer
    Applied physics 58 (1994), S. 111-115 
    Details
    ISSN: 1432-0649
    Keywords: 42.65 ; 68.35
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A wavelength-dependence study of surface second-harmonic generation from Si(111) is presented. Femtosecond laser pulses tuned from 430 nm to 710 nm were used to probe the dispersion characteristics of the nonlinear response from the surface in the vicinity of bulk absorption. Changes in the rotational symmetry and in the phase of the generated second-harmonic signal were observed. An explanation of the observed changes is given based on a simple anharmonic oscillator model [1]
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01082344
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Cyclocondensation of 4-Benzyl-1-hydrazinophthalazine (1990)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 1041-1048 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1-Hydrazino-4-benzylphthalazine 1 underwent closure and/or condensation reaction with formic acid, acetic acid, acetic anhydride, trifluoroacetic anhydride, ortho esteres, aldehydes, urea or carbon disulphide to afford the N-formyl 3a, N-acyl 3b, and the appropriate 3-substituted-6-benzyl-s-triazolo [3,4-a] phthalazines 4a, c, 7, 8. Alkylation of the obtained s-triazolo[3,4-a]-phthalazine-3-thione 7 and s-triazolo [3,4-a] phthalazin-3-one 8 with N-substituted chloroacetamides gave the thioether 9 and N-substitution products 10, respectively. Likewise, applying Mannich conditions of the previously mentioned intermediates 7 and 8 yielded the N-Mannich bases (11 and 12). The new products were characterized by their elemental and spectral data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19903320622
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis of polyfunctionally substituted pyridazines (1990)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1990 (1990), S. 293-296 
    Details
    ISSN: 0170-2041
    Keywords: Pyridazine, derivatives ; Pyrazolo-pyridazine, derivative ; Pyrido-pyridazine, derivative ; Isoxazolo-pyridazine, derivative ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The pyridazines 3, 4, 5, and 7 were obtained by reaction of the hydrazone derivatives 2 with several reagents. By treatment of 5 with acetic acid/hydrochloric acid, the pyrazolo[4,3-c]-pyridazine 6 was formed. The pyrido-pyridazine derivatives 8 and 9 were obtained by reaction of 2 and 3 with malononitrile and ethyl cyanoacetate, respectively, and the isoxazolo-pyridazines 11 by reaction of 3a, b with hydroxylamine hydrochloride in ethanolic sodium ethoxide solution. The intermediate 9 was separated by reaction of 3a, b with hydroxylamine hydrochloride in ethanolic sodium acetate solution.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199019900153
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis of 2-alkyl-3-vinyloxaziridines as potential antitumor agents (1990)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1990 (1990), S. 461-464 
    Details
    ISSN: 0170-2041
    Keywords: Antitumor agents ; Oxaziridines ; Aldimines, unsaturated ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A convenient method for the synthesis of previously unknown oxaziridines having unsaturated substituents at the 3-position (3a-k) is based on the selective oxidation of the imino group of α,β-unsaturated aldimines 2 with m-chloroperbenzoic acid. The title compounds and 2-tert-butyl-3-(phenylethynyl)oxaziridine (3k) exhibit potent activity against experimental tumor cells in vitro.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199019900187
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  • 5
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    Morphological characterization of selected balloon films and its effects on balloon performances (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Morphological characterization of several polyethylene balloon films have been studied using various techniques. The objective is to determine, if any, differentiating structural or morphological features that can be related to the performance of these balloon film materials. The results of the study indicate that the films are composed of either linear low denstiy polyethylene (LLDPE) or low density polyethylene (LDPE). A selective examination of these data imply that films limited degree of branching and larger crystallites size (same % crystallinity) showed good mechanical properties that appear to correlate with their high level of success in balloon flights.
    Keywords: NONMETALLIC MATERIALS
    Type: Advances in Space Research (ISSN 0273-1177); 14; 2; p. (2)31-(2)34
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Characterization of path effects on the properties of balloon films (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The effect of stress and temperature path on the mechanical properties of a balloon film material (Astrofilm E2) have been studied using two techniques. The first technique is based on uniaxial tensile measurements of prestrained strips of the film as a function of temperature. Data are analyzed in terms of two temperature coefficients, defined here as a stiffness coefficient and a strength coefficient; and by comparing the areas under the stress-strain curves. The second technique investigated the effect of stress and temperature path on inflated cylinders of the same material. The changes in the mechanical properties due to preconditioning in the biaxial stress state were evaluated using the ball burst test. Preliminary findings indicate that the material is stress and temperature path dependent. Changes in stiffness coefficient, draw strength and toughness were measured and discussed. The above techniques may be suitable to document path dependent changes, and to discriminate among films of different manufacture.
    Keywords: NONMETALLIC MATERIALS
    Type: Advances in Space Research (ISSN 0273-1177); 14; 2; p. (2)27-(2)30
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    An assessment on the validity of toughness as a balloon film discriminator (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Uniaxial and ball burst toughness for eight commercial polyethylene balloon films have been investigated and compared. Uniaxial toughness was measured in both machine and transverse directions using a rectangular sample 25.4 mm wide by 50.8 mm gage length with an average nominal thickness of 20.32 microns (0.8 mils). Ball burst toughness was measured using a ball burst test fixture with 127 mm hole diameter and 50.8 mm ball diameter resulting in a 0.4 ball to hole diameter ratio. Both the size and shape of the deformed area were observed and the ball burst toughness was calculated based on the deformed area of the film instead of the full area. Specimens were tested at 23 C and -80 C and cross head speed was maintained at 508 mm per minute. The uniaxial toughness were in general, higher than the ball burst toughness. The toughness of the films varied from 12 to 365 MPa when measured uniaxially and from 24 to 73 MPa when measured in the ball burst test. Further investigation showed an apparent correlation between film performance in flight as measured by its stress index and its toughness.
    Keywords: NONMETALLIC MATERIALS
    Type: AIAA PAPER 91-3662 , AIAA International Balloon Technology Conference; Oct 08, 1991 - Oct 10, 1991; Albuquerque, NM; United States
    Format: text
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    NASA TECHNICAL REPORTS
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