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  • Analytical Chemistry and Spectroscopy  (3)
  • SPACE SCIENCES  (2)
  • 1
    Publication Date: 2019-06-27
    Description: Two different types of X-ray polarimeters were used in a sounding rocket to search for X-ray polarization of the Crab Nebula. Polarization was detected at a statistical confidence level of 99.7%. If the X-ray polarization is assumed to be independent of energy, the results of this and a previous experiment lead to a polarization of 15.4 (plus or minus 5.2) percent at a position angle of 156 (plus or minus 10) deg. This result confirms the synchrotron model for X-ray emission from the Crab Nebula.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 174; May 15
    Format: text
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  • 2
    Publication Date: 2019-07-13
    Description: Taurus X-1 X ray emission polarization from rocket-borne polarimeter measurements, utilizing incoherent scattering
    Keywords: SPACE SCIENCES
    Type: CRAB NEBULA SYMPOSIUM; Aug 05, 1970 - Aug 07, 1970; MANCHESTE; United Kingdom
    Format: text
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  • 3
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the basis of the CNDO/2 method paramagnetic screening constants of the central atom of tetrasubstituted silicon compounds of the type Me4-nSiXn (X = F, OMe, NMe2, C1) are calculated, both with and without ΔE approximation. The results are compared with the experimental 29Si n.m.r. chemical shifts. The ‘averaged excitation energies’ ΔE obtained from the comparison of calculated values depend on the charge of the central atom and cannot be considered to be constant for quantitative studies.
    Notes: Auf der Basis des CNDO/2-Verfahrens werden paramagnetische Abschirmungskonstanten für das Zentralatom tetrasubstituierter Siliciumverbindungen Me4-nSiXn (X = F, OMe, NMe2, C1) mit und ohne ΔE-Näherung berechnet und mit den experimentellen 29Si-NMR-chemischen Verschiebungen verglichen. Die aus dem Vergleich der berechneten Werte erhaltenen ‘mittleren Anregungsenergien’ ΔE sind von der Ladung am Zentralatom abhängig und können für quantitative Betrachtungen nicht als konstant angesehen werden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 11 (1978), S. 390-394 
    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 1H and 13C NMR chemical shifts as well as vicinal HH coupling constants of substituted 5-phenyl-2,4-pentadienoic acids Ar—CH=CH—CR=CR—COOH are reported and discussed in connection with the molecular structure. The 13C chemical shift values show an alternation along the chain and can be linearly correlated to the π-electron charge densities as calculated by use of the PPP-method. The effect of para-substituents and solvents upon the 13C chemical shifts can be described in terms of the mutual atom-atom polarizabilities.
    Notes: 1H- und 13C-NMR-chemische Verschiebungen sowie vicinale HH-Kopplungskonstanten von verschieden substituierten 5-Phenyl-2,4-pentadiensäuren Ar—CH=CH—CR=CR—COOH werden mitgeteilt und im Zusammenhang mit der Molekülstruktur diskutiert. Die entlang der Molekülkette alternierenden 13C-chemischen Verschiebungen können linear mit den entsprechenden in PPP-Näherung berechneten π-Elektronenladungsdichten korreliert werden. Die ebenfalls alternierenden Einflüsse der paraständigen Substituenten bzw. der Lösungsmittel auf die 13C-chemischen Verschiebungen sind mittels Atom-Atom-Polarisierbarkeiten beschreibbar.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The introduction of a benzene ring between the hydroxyl and carbomethoxyl groups of long chain aliphatic hydroxy esters results in a steric hindrance which restrains the interactions between the functional groups and the resulting fragmentations. The study of a series of methyl p-(hydroxyalky) benzoates shows that the importance of these interactions decreases considerably state with (9 + φ)links, or less to the benefit of those fragmentations which do not require such interactions. It is further shown that the specific transfer of a benzylic hydrogen atom to the carbomethoxyl group involves transfer via the hydroxyl group.
    Notes: L'introduction d'un noyau benzénique entre les groupes hydroxyle et carbométhoxyle d'hydroxyesters aliphatiques à longue chaîne introduit une contrainte stérique qui s'oppose aux interactions entre les deux groupes fonctionnels et aux fragmentations qui en résultent. L'étude d'une série de p-(hydroxyalkyl)benzoates de méthyle montre que l'importance de ces interactions diminue considérablement lorsque le transfert de l'hydrogène hydroxylique sur le groupe carbométhoxyle nécessite un état de transition de (9+ φ) chaînons, ou moins, au profit des fragmentations qui ne résultent pas de ces interactions. Il est montré qu'un transfert spécifique d'un hydrogène benzylique sur le groupe carbométhoxyle s'opère via le groupe hydroxyle qui sert de relais.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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