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  • Körpergröße  (1)
  • PACS: 14.20.Dh Properties of specific particles: Protons and neutrons – 24.70.+s Nuclear reactions: Polarization phenomena in reactions – 13.40.Gp Specific reactions and phenomenology: Electromagnetic form factors – 25.10.+s Nuclear reactions involving few–nucleon systems – 25.30.Fj Nuclear reactions: Inelastic electron scattering to continuum  (1)
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  • 1
    ISSN: 1434-601X
    Keywords: PACS: 14.20.Dh Properties of specific particles: Protons and neutrons – 24.70.+s Nuclear reactions: Polarization phenomena in reactions – 13.40.Gp Specific reactions and phenomenology: Electromagnetic form factors – 25.10.+s Nuclear reactions involving few–nucleon systems – 25.30.Fj Nuclear reactions: Inelastic electron scattering to continuum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The electric form factor of the neutron GEn has been determined in double polarized exclusive 3 He(e,e'n) scattering in quasi–elastic kinematics by measuring asymmetries A ⊥, A ∥ of the cross section with respect to helicity reversal of the electron, with the nuclear spin being oriented perpendicular to the momentum transfer q in case of A⊥ and parallel in case of A∥. The experiment was performed at the 855 MeV c. w. microtron MAMI at Mainz. The degree of polarization of the electron beam and of the gaseous 3 He target were each about 50%. Scattered electrons and neutrons were detected in coincidence by detector arrays covering large solid angles. Quasi–elastic scattering events were reconstructed from the measured electron scattering angles ϑe, φe and the neutron momentum vector p n ′ in the plane wave impulse approximation. We obtain the result 〈G En〉(0.27 〈 Q2c2/GeV2 〈 0.5)= 0.0334 ± 0.0033stat± 0.0028syst which is averaged over the indicated range of Q 2, the squared momentum transfer. This G En value is significantly smaller than measured from the D(e,e'n) reaction under similar kinematical conditions. To what extent final state interactions in 3He quench the G En result is subject of calculations currently in progress elsewhere.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Normales Hirngewicht ; Erwachsene ; Alter ; Geschlecht ; Körpergröße ; Gewicht ; Key words Normal brain weight ; Adults ; Age ; Sex ; Height ; Weight
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Based on more than 8000 autopsies of male and female patients without brain diseases the normal brain weight of adult males and females in relation to sex, age, body-weight, and body-height as well as Body Mass Index were calculated. The average brain weight of the adult male was 1336 gr; for the adult female 1198 gr. With increasing age, brain weight decreases by 2.7 gr in males, and by 2.2 gr in females per year. Per centimeter body height brain weight increases independent of sex by an average of about 3.7 gr. Body Mass Index is of minor importance and only relevant in males. Based on these data the independent variables, age and height, were for the first time combined in a nomogram for the calculation of brain weight. The mathematical functions were integrated in a computer program which facilitates the calculation of normal brain weights in individual cases.
    Notes: Zusammenfassung Anhand von über 8000 Autopsien von Patienten ohne Hirnkrankheiten wurden die Normgewichte der Gehirne für Männer und Frauen in Abhängigkeit von Alter, Körpergröße, Gewicht und Body Mass Index berechnet. Das Hirngewicht des erwachsenen Mannes beträgt im Durchschnitt 1336 g, das der erwachsenen Frau 1198 g. Pro Altersjahr nimmt das Hirngewicht beim Mann um ca. 2,7 g, bei der Frau um ca. 2,2 g ab. Pro cm Körpergröße nimmt das Hirngewicht bei beiden Geschlechtern um ca. 3,7 g zu. Den geringsten Einfluß auf das Hirngewicht hat der Body Mass Index, der praktisch nur bei Männern bedeutsam ist. Aus den unabhängigen Variablen, Alter und Körpergröße, wurde erstmals ein Nomogramm für das zu erwartende Hirngewicht konstruiert. Gleichzeitig wurden die Funktionen unter Berücksichtigung der wichtigsten Einflußgrößen in ein Computerprogramm integriert, das die Normgewichte errechnet und quantitative Aussagen über die Abweichung des Hirngewichts von der Norm im Einzelfall erlaubt.
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