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  • Electronic Resource  (9)
  • 1990-1994  (9)
  • 1975-1979
  • 1990  (9)
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  • Electronic Resource  (9)
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  • 1990-1994  (9)
  • 1975-1979
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  • 1
    Electronic Resource
    Electronic Resource
    Two-wavelength operation of a tunable KrF excimer laser — A promising technique for combustion diagnostics (1990)
    Springer
    Applied physics 51 (1990), S. 91-93 
    Details
    ISSN: 1432-0649
    Keywords: 42.55.Gp ; 42.60.Da
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A KrF excimer laser was operated on two independently tunable lines. This was achieved by a double-resonator configuration with two gratings. Tuning range and gain competition were investigated. The narrow line width (〈1 cm−1) and the independent tunability make this laser ideal for simultaneous spectroscopic detection of two species and temperature measurements in combustion processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00326005
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  • 2
    Electronic Resource
    Electronic Resource
    Berechnung des Spannungs- und Verschiebungsfeldes anisotroper Scheiben mit elliptischem Ausschnitt (1990)
    Springer
    Archive of applied mechanics 60 (1990), S. 507-517 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary The plane stress and displacement field around the elliptical hole of an anisotropic linear elastic plate under arbitary orientation of tension force and fibres is analytically determined by the method of stress functions of a complex variable. For this purpose the infinite plate under uniaxial tension is used as mathematical model. For the example of glass fibre reinforced plastics with orthotropic properties it is shown that the data gathered from isotropic materials on the behaviour of stress and displacement around elliptical and circular holes are not applicable to anisotropic materials. This is especially true when load and orthotropic principal directions (off-axis-load) diverge. For several particular cases, the hole stress concentration factors which are decisive for the design are depicted in polar diagrams. The position of the maximum stress is also given which — in contrast to isotropic materials — generally no longer coincides with the notch base.
    Notes: Übersicht Für die anisotrope linear-elastische Scheibe unter beliebiger Zugkraft- und Faserorientierung wird analytisch das ebene Spannungs- und Verschiebungsfeld um die elliptische Innenkerbe mittels komplex-wertiger Spannungsfunktionen ermittelt. Dabei dient als mathematisches Modell der (gezogene) Scheibenstreifen unendlicher Breite. Am Beispiel orthotrop glasfaserverstärkter Werkstoffe wird gezeigt, daß die vom isotropen Werkstoff her bekannten Aussagen über das Spannungs- und Verschiebungsverhalten an elliptischen und kreisförmigen Kerben auf anisotrope Werkstoffe nicht übertragbar sind. Insbesondere gilt dies bei Auseinanderklaffen von Last- und Orthotropiehauptrichtung (off-axis-Belastung). Für einige ausgezeichnete Fälle werden die für die Dimensionierung maßgebenden Spannungsüberhöhungsfaktoren in Polardiagrammen dargestellt sowie der Ort der maximalen Spannungsüberhöhung angegeben, der — im Unterschied zum isotropen Werkstoff — i. allg. nicht mehr mit dem Kerbgrund zusammenfällt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00541907
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  • 3
    Electronic Resource
    Electronic Resource
    Audiovocal interactions during development? Vocalisation in deafened young horseshoe bats vs. audition in vocalisation-impaired bats (1990)
    Springer
    Journal of comparative physiology 167 (1990), S. 771-784 
    Details
    ISSN: 1432-1351
    Keywords: Ontogeny ; Audition ; Vocalisation ; Sensorimotor interaction ; Rhinolophus rouxi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Horseshoe bats (Rhinolophus rouxi) were deafened in their 3rd–5th postnatal week. Subsequently their vocalisations were monitored to evaluate the impact of audition on the development of echolocation pulses. Hearing impairment affected the echolocation pulses as follows: the frequency of the constant frequency (CF) component was altered by between + 4 kHz and − 14 kHz, and the dominance of the second harmonic of the pulses was neutralised by a relative increase in intensity of the first and third harmonics. A second experiment focused on possible influences of acoustical self-stimulation with echolocation pulses on the establishment of auditory fovea representation in the inferior colliculus (IC). Frequency control of echolocation pulses was disrupted by larynx denervation. Thereafter, the bats produced multiharmonic echolocation signals (4–11 harmonics) varying in frequency. IC tonotopy, however, as monitored by stereotaxic electrophysiology, showed the same developmental dynamics as seen in control specimens (Fig. 10). Both experiments indicate that throughout postnatal development echolocation pulses are under auditory feedback control, whereas maturation of the auditory fovea and shifts in its frequency tuning represent an innate process. The significance of this postnatal development might be the adjustment of the vocal motor system of each bat to the frequency of its ‘personal’ auditory fovea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00189767
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  • 4
    Electronic Resource
    Electronic Resource
    Ontogenesis of auditory fovea representation in the inferior colliculus of the Sri Lankan rufous horseshoe bat, Rhinolophus rouxi (1990)
    Springer
    Journal of comparative physiology 167 (1990), S. 757-769 
    Details
    ISSN: 1432-1351
    Keywords: Ontogeny ; Auditory fovea ; Tonotopy ; Sexual dimorphism ; Rhinolophus rouxi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary This report describes the ontogenesis of tonotopy in the inferior colliculus (IC) of the rufous horseshoe bat (Rhinolophus rouxi). Horseshoe bats are deaf at birth, but consistent tonotopy with a low-to-high frequency gradient from dorsolateral to ventromedial develops from the 2nd up to the 5th week. The representation of the auditory fovea is established in ventro-mediocaudal parts of the IC during the 3rd postnatal week (Fig. 3). Then, a narrow frequency band 5 kHz in width, comprising 16% of the bat's auditory range, captures 50–60 vol% of the IC (Fig. 3c). However, foveal tuning is 10–12 kHz (1/3 octave) lower than in adults; foveal tuning in females (65–68 kHz) is 2–3 kHz higher than in males (62–65 kHz). Thereafter, foveal tuning increases by 1–1.5 kHz per day up to the 5th postnatal week, when the adult hearing range is established (Figs. 4, 5). The increase of sensitivity and of tuning sharpness of single units also follows a low-to-high frequency gradient (Fig. 6). Throughout this development the foveal tuning matches the second harmonic of the echolocation pulses vocalised by these young bats. The results confirm the hypothesis of developmental shifts in the frequency-place code for the foveal high frequency representation in the IC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00189766
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  • 5
    Electronic Resource
    Electronic Resource
    Inclusive π0 and η meson production in electron positron interactions at $$\sqrt s = 10 GeV$$ (1990)
    Springer
    The European physical journal 46 (1990), S. 15-23 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on a high statistics study of π0 and η production in continuum events and in direct decays of the Γ(1S) and Γ(2S) resonances. The measured production rates per event are $$\left\langle {n_{\pi ^0 } } \right\rangle$$ =3.22 ± 0.07 ± 0.31 (3.97 ± 0.23 ± 0.38) and 〈n η〉=0.19 ± 0.04 ± 0.04 (0.40 ± 0.14 ± 0.09) for continuum events (direct Γ(1S) decays).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02440829
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  • 6
    Electronic Resource
    Electronic Resource
    Measurement ofK + K − production in γγ collisions (1990)
    Springer
    The European physical journal 48 (1990), S. 183-190 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The production of charged kaon pairs in two-photon interactions has been studied with the ARGUS detector and the topological cross section has been measured. The γγ-widths and interference parameters have been determined for the tensor mesonsf 2 (1270),a 2 (1318) andf′ 2 (1525). The helicity structure assumed for the continuum contribution has a significant effect on the result. Upper limits have been obtained for the γγ-widths of the glueball candidate statesf 2 (1720) andX (2230).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01554464
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  • 7
    Electronic Resource
    Electronic Resource
    Exclusive hadronic decays ofB mesons (1990)
    Springer
    The European physical journal 48 (1990), S. 543-551 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the ARGUS detector at thee + e − storage ring DORIS II, we have measuredB decays into exclusive final states containing aD orD * meson plus several pions, or containing aJ/ψ or ψ′ meson plus a strange particle. Some of these channels have not been seen before, while others represent updated measurements of previous results. The branching ratios are compared with the predictions of the model of Bauer, Stech and Wirbel. Using the cleanest decay channels, the mass of the charged and neutralB meson are found to bem B −=(5280.5±1.0±2.0) MeV/c2 andm B 0=(5279.6±0.7±2.0) MeV/c2 respectively, yielding a mass differencem B 0−m B − =(−0.9±1.2±0.5) MeV/c2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01614687
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  • 8
    Electronic Resource
    Electronic Resource
    A study of Cabibbo-suppressedD 0 decays (1990)
    Springer
    The European physical journal 46 (1990), S. 9-14 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the ARGUS detector at thee + e − storage ring DORIS II, we have measured branching ratios for the Cabibbo-suppressed decaysD 0→π-π+,D 0→K − K +, andD 0→K s 0 K -π+, observed the Cabibbo-allowed decayD 0→K s 0 K s 0 and obtained an upper limit on the branching ratio for $$D^0 \to K^0 \bar K^0$$ .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02440828
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  • 9
    Electronic Resource
    Electronic Resource
    Agglomerations- und Schüttguttechnik sowie Partikelmeßtechnik (1990)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 62 (1990), S. 968-977 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330621129
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