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  • MATERIALS, METALLIC  (47)
  • Analytical Chemistry and Spectroscopy
  • 1980-1984
  • 1970-1974  (78)
  • 1972  (78)
Collection
Keywords
Publisher
Years
  • 1980-1984
  • 1970-1974  (78)
Year
  • 1
    Electronic Resource
    Electronic Resource
    The proton chemical shifts of polychlorinated biphenyls (1972)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 4 (1972), S. 309-319 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A 220 MHz NMR spectrometer has been used to identify the structure of polychlorinated biphenyls (PCBs). The proton chemical shifts and approximate coupling constants of PCBs fractionated from Aroclor 1254 are given in the text. The spectra of model compounds are included in the supplement. The chemical shifts are also tabulated according to the ring substitution pattern, when it can be seen that the shifts change systematically with the degree of both the total ring substitution and the substitution in the positions ‘ortho’ to the bridging bond between the rings.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270040210
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The NMR spectra of fluoroaromatics - IV:For Part III, see Ref. 1. 1H and 19F spectra of some fluorinated benzofurans (1972)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 4 (1972), S. 343-352 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The complete analyses of the 19F spectra of some fluorinated benzofurans are given. These provide an unambiguous determination of the substituent position in these compounds. Comparison of the 19F SCS and coupling constants in the benzofuran, benzothiophene and benzene series shows that 19F spectral parameters can be transposed from the benzene series with caution.A large increase in the para F—F coupling with ring closure of the hetero-ring is noteworthy. A long-range through-space 8JH is reported which arises from the proximity of the 3 carboethoxy methyl group and the C4 fluorine in these molecules.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270040214
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Substituent effects in the field ionization mass spectra of acetophenones (1972)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 6 (1972), S. 923-930 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Substituent effects in the electron-impact and field ionization mass spectra of acteophenones are compared. No Hammett correlation could be found for the fragments formed on the surface of the field anode. A straight line log z/z0 versus σ+ was observed, however, for the metastable decomposition of para-substituted acetophenones (and also some benzophenones). Meta-substituted compounds did not yield such straight lines.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210060813
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  • 4
    facet.materialart.
    Unknown
    The effects of high-temperature brazing and thermal cycling on the mechanical properties of Hastelloy X (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Data are presented on the effects of brazing alloy, brazing operation, thermal cycling, and combinations of these on the yield strength, elongation, tensile strength, and fatigue life of thin gage Hastelloy X. These data show that brazing at 1461 K (2170 F) with a Ni-Pd-Au alloy and subsequent exposure to 200 service thermal cycles between 533 and 1144 K (500 and 1600 F) result in reduction of as much as 39 percent in yield strength, 33 percent in elongation, 14 percent in tensile strength, and 26 percent in fatigue limit of Hastelloy X, as compared to as-received materials. These property losses are primarily caused by the brazing operation rather than the subsequent service thermal cycles.
    Keywords: MATERIALS, METALLIC
    Type: Proc. of the Symp. on Welding, Bonding, and Fastening; 23 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
    facet.materialart.
    Unknown
    The effect of alloy composition on the mechanism of stress-corrosion cracking of titanium alloys in aqueous environments (1972)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A detailed study was made of the relation between the size distribution of Ti3Al particles in a Ti-8Al alloy and the tensile properties measured in air and in saltwater. The size distribution of Ti3Al was varied by isothermal aging for various times at temperatures in the range 770 to 970 K (930 to 1290 F). The aging kinetics were found to be relatively slow. Quantitative measurements of the particle coarsening rate at 920 K (1200 F) showed good agreement with the predicted behavior for coarsening controlled by matrix diffusion, and suggested that the specific free energy of the Ti3Al alpha interface in negligible small. In all cases, the Ti3Al particles were sheared by the glide dislocations. It was concluded that there is a definite correlation between the presence of deformable Ti3Al particles and an alloy's susceptibility to aqueous stress corrosion cracking. Furthermore, the appearance of the surface slip lines and the dislocation substructure in deformed specimens suggest that the specific effect of the Ti3Al particles is to cause a nonhomogeneous planar slip character and an enhanced chemical potential of the slip bands.
    Keywords: MATERIALS, METALLIC
    Type: NASA-CR-131872
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Unknown
    The effect of alloy composition on the mechanism of stress corrosion cracking of titanium alloys in aqueous environments (1972)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The effects of alloy composition on the aqueous stress corrosion of titanium alloys were studied with emphasis on determining the interrelations among composition, phase structure, and deformation and fracture properties of the alpha phase in alpha-beta alloys. Accomplishments summarized include the effects of alloy composition on susceptibility, and metallurgical mechanisms of stress-corrosion cracking.
    Keywords: MATERIALS, METALLIC
    Type: NASA-CR-126217 , QPR-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
    Electronic Resource
    Electronic Resource
    Solvent effects in NMR spectra induced by benzene in amidoximes - V (1972)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 4 (1972), S. 229-235 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Proton chemical shifts as well as solvent shifts induced by benzene in several amidoximes are examined with respect to their configuration and are compared to the solvent shifts induced in benzalanilines. The geometry of the benzene-solute ‘collision-complex’ is also discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270040204
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  • 8
    Electronic Resource
    Electronic Resource
    An NMR study of the conformational equilibrium of 5-fluoro-1,3-dioxan in solution. Dependence on solventSee Ref. 1. (1972)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 4 (1972), S. 369-376 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 1H and 19F NMR parameters of 5-fluoro-1,3-dioxan (1) dissolved in a number of solvent systems are interpreted on the basis of fast inversion between two chair conformations. In cyclohexane solution the two chair conformations are almost equally populated, whereas in more polar solvents, such as chloroform, the conformation having the fluorine substituent in an axial position is strongly preferred. Addition of acetic acid to a solution of 1 in cyclohexane increases the preference of the fluorine substituent for the axial orientation. Possible reasons for these observations are discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270040303
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  • 9
    Electronic Resource
    Electronic Resource
    The NMR spectra and conformations of cyclic compounds—V: Proton couplings and chemical shifts in bridged cyclobutanes (1972)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 4 (1972), S. 489-507 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The PMR spectra of twelve pinene derivatives are reported, analysed and assigned.The proton couplings in the bridged cyclobutane group are compared with those of other strained cyclobutanes, and the relationship between 2JHH and the C.CH2.C angle is shown to be anomalous in these systems, suggesting unusually small H. C. H. angles in cyclobutanes.The very large values of 4JHH (eq-eq) in buckled cyclobutanes are interpreted in terms of current M. O. theory and also given a simple geometric rationalisation based on the direct mechanism.The various couplings in the pinene skeleton are discussed in terms of present theories and minor conformational effects in these molecules. Substituent chemical shift (SCS) values for Me and OH groups around the pinene skeleton are obtained, and shown not to agree with calculations based on present theories of chemical shifts.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270040409
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  • 10
    Electronic Resource
    Electronic Resource
    13C-NMR-chemische Verschiebungen von Polymethinen. Elektronenstruktur und Lösungsmitteleinfluss6. Mitteilung über Solvatochromieprobleme. 7. Mitt. vergl.1 (1972)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 4 (1972), S. 571-576 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The 13chemical shifts of simple polymethines (cyanines and merocyanines) show the very pronounced charge alternation in these compounds. The 13C shifts of polar merocyanines are also susceptible to solvent polarity, which in this case has a strong influence upon the electron structure.
    Notes: Die 13C-NMR-chemischen Verschiebungen von einfachsten Polymethinen bestätigen die alternierende Elektronendichteverteilung bei diesen Verbindungen. Die Verschiebungen polarer Merocyanine sind von der Polarität des Lösungsmittels abhängig und beweisen damit eine lösungsmittelinduzierte Veränderung der Elektronenstruktur.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270040418
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