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  • Digitale Medien  (15)
  • 1975-1979  (15)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    The European physical journal 272 (1975), S. 369-374 
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Neutron rich205Hg (T 1/2=5.2 min) was produced and on-line mass separated at the ISOLDE facility at CERN. The polarization achieved by optical pumping via the atomic line (6s 21 S 0↔6s6p 3 P 1,λ=2 537Å) was monitored by theβ decay asymmetry. Hyperfine structure and isotopic shift of the205Hg absorption line was determined by Zeeman scanning. In addition a magnetic resonance was performed on the polarized205Hg nuclei in the atomic ground state. The results are: $$I(^{205} Hg) = \tfrac{1}{2}$$ (confirmed);μ I (205Hg)=0.5915 (1)μ N (uncorrected for diamagnetism); isotopic shiftδv204/205=v(205Hg)-v(204Hg)=−1.8 (1) GHz.μ I and IS are discussed briefly in the frame of current literature.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    The European physical journal 276 (1976), S. 187-202 
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The extension of the Nuclear Radiation Detected Optical Pumping method to mass-separated samples of isotopes far off stability is presented for a series of light Hg isotopes produced at the ISOLDE facility at CERN. The isotope under investigation is transferred by an automatic transfer system into the optical pumping apparatus. Zeeman scanning of an isotopically pure Hg spectral lamp is used to reach energetic coincidence with the hyperfine structure components of the 6s 2 1 S 06s6p 3P1,λ=2,537 Å resonance line of the investigated isotope and the Hg lamp. The orientation built up by optical pumping is monitored via the asymmetry or anisotropy of the nuclear radiation. Nuclear spins, magnetic moments, electric quadrupole moments and the isotope shifts are obtained for181Hg-191Hg using theβ asymmetry as detector. The extension of the method using theγ anisotropy is discussed and test measurements on193Hg are presented. This paper describes the experimental procedure, results, and discussion are given in a following publication.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    The European physical journal 276 (1976), S. 203-217 
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The hyperfine structure splitting and the isotope shift in the (6 s2 1S0 - 6s 6p3P1,λ=2,537 Å) line of very neutron deficient Hg isotopes were determined by the β radiation detected optical pumping method (β-RADOP). In addition, nuclear magnetic resonance was observed in the atomic ground state. The results are Mean-square nuclear charge radii are calculated. Interpreting the sudden change of nuclear radius between187Hg and185Hg δ〈r2〉187,185=0.42(5)fm2 as oblate-prolate shape transition, one obtains δ〈β2〉 =0.054(5).
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    ISSN: 1432-0630
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The pentaphosphate system Nd1−x Y x P5O14 covers four crystalline phases with five different site geometries for Nd. We determined the4F3/2,4I13/2,4I11/2,4I9/2 stark levels and identified the sites spectroscopically, including the case of the monoclinic layer structureC2/c which has two Nd sites. Crystal field calculations for the energy levels in the monoclinic phaseP2 1/c and the orthorhombic phasepnma with tetragonal and orthorhombic site symmetry approximations are reasonable but reveal their shortcomings. As a consequence, we consider it improper to try to calculate rare-earth optical transition probabilities with approximate crystal fields. Random distribution of Nd and Y causes inhomogeneous broadening (∼6 Å) which peaks atx=0.5. Thermal equilibrium between the4F3/2 levels is reached within 2–5×10−13 sec. The three room temperature modifications could be lased cw. Pure NdP5O14 was found to be the best laser.
    Materialart: Digitale Medien
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Archives of gynecology and obstetrics 228 (1979), S. 130-165 
    ISSN: 1432-0711
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Applied physics 17 (1978), S. 367-370 
    ISSN: 1432-0630
    Schlagwort(e): 42.55 ; 78.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract We report on room temperature quasi-cw laser action in K5Nd(MoO4)4 at a wavelength of 1.067 μm. The crystal was pumped with the 5140 Å line of an argon ion laser. Due to thermal effects actual cw lasing was not possible. Chopping the pump light with a low duty cycle of 1∶1000 leads to quasi-cw laser action and stable output power. We have determined the fundamental laser parameters: threshold pump powerA T=15 mW, slope efficiency η=22%, and internal lossesL=2.5%. In order to explain the measured relaxation oscillations, diffusion of the excited 4f-excitons is considered. According to a recently developed theory, a diffusion constant ofD=2×10−6cm2/s explains the observed results.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Applied physics 18 (1979), S. 77-80 
    ISSN: 1432-0630
    Schlagwort(e): 42.55 ; 78.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract We report, for the first time, on room temperature cw laser action of NdP5O14 and NdAl3(BO3)4 at 1.3 μm wavelength. The emission cross sections of the transition4 F 3/2→4 I 13/2 are 0.24·10−19 cm2 and 1.74·10−19 cm2, respectively. The lowest observed threshold was 45 mW and the slope efficiency was nearly 10%. The minimum threshold is expected to be about 5 mW of absorbed pump light for both materials.
    Materialart: Digitale Medien
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  • 8
    ISSN: 1432-1920
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary CT cisternography and CSF scintigraphy are indispensable in the detailed morphologic and etiologic evaluation of special types of childhood hydrocephalus. In addition these investigations afford interesting insights into CSF dynamics in apparently complete membranous or tumorous obstruction of the fourth ventricle and into the genesis of internal hydrocephalus in cerebellopontine angle tumors.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    European archives of psychiatry and clinical neuroscience 221 (1975), S. 53-66 
    ISSN: 1433-8491
    Schlagwort(e): Late Schizophrenia ; Psychopathology ; Prognosis ; Types of Schizophrenic Course ; Spätschizophrenie ; Psychopathologie ; Prognose ; Verlaufstypen
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Der Begriff “Spätschizophrenie” wird in Anlehnung an M. Bleuler definiert. Von 502 Schizophrenien, die 1945 bis 1959 in der Bonner Nervenklinik stationär aufgenommen waren und spätkatamnestisch untersucht wurden, erkrankten 14%, bei Berücksichtigung der verstorbenen Patienten 17, 1% (110 von 644 Fällen) nach dem 40. Lebensjahr, dabei je 50% zwischen dem 40. und 44. bzw. 45. und 59. Lebensjahr. 24, 3% der Spätschizophrenien manifestierten sich nach dem 50., 3, 1% nach dem 60. Lebensjahr. Die durchschnittliche Beobachtungsdauer betrug 17, 8 Jahre, einschließlich der Prodrome 20, 7 Jahre. In 42, 8% gingen Prodrome und/ oder Vorpostensyndrome voraus. Das weibliche Geschlecht überwiegt mit 64, 3%. Syntone Ausgangspersönlichkeiten sind mit 49, 3% deutlich häufiger, psychopathische Primärpersönlichkeiten dagegen seltener als bei den übrigen Schizophrenien; hinsichtlich prämorbider Intelligenz und familiärer Belastung bestehen keine Unterschiede. Seelisch-reaktive Auslösung ist mit 31, 9% nicht signifikant häufiger als im Gesamtkollektiv (25%). Auch durch soziale Faktoren (soziale Schicht der Elternfamilie, Ledigenquote, Kinderlosigkeit und Spätheirat) lassen sich die Spätschizophrenien nicht sicher von den übrigen abheben. Initiales Prävalieren paranoid-halluzinatorischer (59, 4%) und paranoider Syndrome (23, 2%) ist noch deutlich häufiger als bei den Schizophrenien der ersten Lebenshälfte; depressive Verstimmungen (47, 1%) und Coenästhesien (64, 3%) werden seltener beobachtet als dort. Die Dauerprognose ist, besonders bei den Frauen, günstiger; die Rate der Vollremissionen beträgt 30%, ca. 35% remittieren auf leichte reine Residuen. Alle Verlaufstypen der Schizophrenie kommen auch bei der Spätschizophrenie vor; monophasische Typen sind mit 17, 6% signifikant häufiger, die beiden prognostisch ungünstigsten Verlaufstypen signifikant seltener als beim Gesamtkollektiv. Die Rate sozialer Heilungen ist mit 64, 3% höher, die Rate der Dauerunterbringungen mit 10% niedriger als im Gesamtkollektiv. Für Therapie und Rehabilitation gelten angesichts der Wesensgleichheit mit der Gesamtgruppe der Schizophrenien die gleichen Prinzipien wie dort.
    Notizen: Summary The designation “late schizophrenia” is used with reference to M. Bleuler. Of 502 cases of schizophrenia admitted to the mental hospital of the university of Bonn from 1945–1959 and later catamnestically examined, 14% were taken ill after age 40. Including the deceased,the percentage increases to 17. 1 (110 of 644 cases). The onset of disturbance could be ascertained with 50% occurring equally between age 40–44 and age 45–59. Late schizophrenia became manifest after age 50 in 24. 3% and in 3. 1% after age 60. The average period of observation was 17. 8 years, and 20. 7 years including prodromes. In 42. 8% prodromes and/or signs in advance could be traced. Females predominated (64. 3%). Syntonic personalities were markedly more frequent (49. 3%), psychopathic primary personalities less frequent than in other schizophrenias in the first half of life. With regard to premorbid intelligence or hereditability no differences could be found. Psychic-reactive actuation (31. 9%) was not significantly more frequent than in the group as a whole (25%). Not even by social factors (social class of parental family, bachelorhood rate, childlessness, and late marriage) could late schizophrenia be reliably distinguished from other schizophrenias. The quota of initially dominating paranoid-hallucinatory (55. 4%) and paranoid syndromes (23. 2%) is markedly higher than in schizophrenia of the first half of life, depressive moods (47. 1%) and coenaesthesias (64. 3%) less frequent. The final prognosis is — especially for women — more favorable, the rate of full remissions amounting 30%; 35% showed remissions to slight pure residual symptoms. All types of schizophrenic courses also occur in late schizophrenia; monophasic types are significantly more frequent, the two most prognostically unfavorable types are significantly rarer than in the group as a whole. The rate of social reintegration is with 64. 3% higher and that of permanent hospitalization 10% lower than in the group as a whole. In view of the identity of late schizophrenia with all other schizophrenias, the same principles have to be applied to therapy and rehabilitation.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    European journal of applied physiology 37 (1977), S. 197-204 
    ISSN: 1439-6327
    Schlagwort(e): 400 m run ; Induced alkalosis ; Performance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The influence of bicarbonate and Tris-buffer infusions on the performance capacity for maximal, brief exercise (400 m run) was studied using 10 normal males in their twenties. Run time, maximal lactate concentration and heart rate remained unchanged after the buffer infusions. As a result of the induced elevated buffering capacity, the average pH after exercise was about 0.1 unit higher. Corresponding values for base excess and standard bicarbonate were found. The arterial pCO2 was higher after infusion as a result of the active respiratory compensation. Since the reduction in the work-related metabolic acidosis by the buffering substances caused no improvement in performance, the importance of pH as the performance-limiting factor must be questioned because the investigation gave no evidence for alterations of intracellular pH.
    Materialart: Digitale Medien
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