Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 11
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    International Journal of Psychophysiology 14 (1993), S. 125 
    ISSN: 0167-8760
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine , Psychology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Computing 36 (1986), S. 263-270 
    ISSN: 1436-5057
    Keywords: 90C10 ; Matching problem ; assignment problem ; computational results
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Wir zeigen wie optimale „Fractional Matchings”, d. h. optimale Lösungen der LP-Relaxation des Matching-Problems, benutzt werden können, um Ausgangslösungen für die kürzeste erweiternde Wege-Methode zur Lösung des Matching-Problems zu konstruieren. Numerische Untersuchungen zeigen, daß diese Startprozedur höchst effizient ist und den Aufwand für den eigentlichen Matching-Algorithmus signifikant reduziert, so daß die Gesamtrechenzeit drastisch reduziert wird.
    Notes: Abstract We show how optimal fractional matchings can be used to start the shortest augmenting path method for solving the (integer) matching problem. Computational results are presented which indicate that this start procedure is highly efficient, i.e. it is fast and reduces the amount of work for the shortest augementing path method significantly such that the overall computing time is reduced drastically.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Computing 36 (1986), S. 301-311 
    ISSN: 1436-5057
    Keywords: 90C08 ; Assignment problem ; algorithms ; computational results
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Wir beschreiben eine neue Implementierung der kürzesten-erweiternden-Wege-Methode zur Lösung dünner Zuordnungsprobleme und berichten über numerische Untersuchungen, die die Effizienz dieser Implementierung dokumentieren.
    Notes: Abstract We describe a new implementation of the shortest augmenting path approach for solving sparse assignment problems and report computational experience documenting its efficiency.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical programming 50 (1991), S. 113-121 
    ISSN: 1436-4646
    Keywords: Matching problem ; two-phase approach ; fast matching algorithms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract In this paper we describe computational results for a modification of the shortest augmenting path approach for solving large scale matching problems. Using a new assignment start procedure and the two-phase strategy, where first the problem is solved on a sparse subgraph and then reoptimization is used, matching problems on complete graphs with 1000 nodes are solved in about 10–15 seconds on an IBM 4361.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 15
    ISSN: 1432-1246
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 16
    ISSN: 1432-1246
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 17
    ISSN: 1432-1246
    Keywords: Whole-body vibration ; Transmission ; Resonance ; Damping ; Whole-body vibration ; Transmission ; Electromyogram ; Vestibular organ ; Stabilography ; Whole-body vibration ; Performance ; Subjective assessment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Part II. On exposure to vibration the electrical muscular activity of the dorsal extensor increases (ECG-potentials eliminated) when the body-posture is strictly controlled. The higher vibration intensity 11 leads to a greater increase of the activity than the lower 12. The intensity dependence is particularly marked in the range 4 Hz. On exposure at 2 Hz the increase of the muscular activity is smaller than at 4 Hz or 8 Hz. No difference in the muscular response to sinusoidal and stochastic vibration can be shown by means of the mean muscular voltage. The muscular response under exposure to vibration is regarded as a reflex reaction which can produce an active vibration damping with exposure-dependent effectivity. The regulation of the body posture, characterized by the standard deviation (s) of the amplitude-histogram of stabilograms, shows a dependence on the vibration frequency immediately after exposure. After exposure to 2 Hz vibration there is (in contrast to 4 Hz and 8 Hz) a marked increase of s in the sagittal stabilogram, which is interpreted as a symptom of a latent kinetosis. Under the conditions studied it can be said that sinusoidal and stochastic vibrations do not affect the standard deviation differently. The galvanic vestibular excitability is recorded quantitatively as mean body-sway response (b.s.r.). After stochastic vibration the b.s.r. is less marked than after sinusoidal vibration. 15 minutes after the end of the stochastic vibration with the intensity I1 the b.s.r. is still smaller than after exposure to sinusoidal vibration of the same intensity. These results are discussed in relation to a different effect on the otolithes, which is dependent on the mode of vibration.
    Abstract: Summary Part III. Psychically regulated performances are investigated by means of the optical clock-test and an acoustical signal-detection during az-vibrations (2 Hz − 2.4 and 1.2 m/s2; 4 Hz − 1.7 and 2.4 m/s2; 8 Hz − 1.7 and 3.4 m/s2). Already when the “fatigue-decreased proficiency boundary” of ISO 2631 is not exceeded, significant performance-worsenings cannot be excluded. When this intensity is exceeded, marked performance-worsenings are observed. The results indicate that the frequencies 2 Hz and 4 Hz produce a stronger performance-worsening than a vibration of 8 Hz; statistically ensured differences can, however, not be shown. Sinusoidal and stochastic vibrations of the same r.m.s. do not differ with respect to their effects on psychically regulated performance; their subjective assessment is, however, different. From the results described in parts I, II, and III we conclude that: 1. the investigated sinusoidal and stochastic vibrations have nearly the same biological effects; there are some indications of more marked effects of stochastic vibration; 2. the “fatigue-decreased proficiency boundary” of ISO 2631 for the physical conditions investigated is minimum requirement for guaranteeing the entire proficiency; 2. for the frequency 2 Hz a stronger biological effect can be assumed than that fixed at present in ISO 2631. The hypothesis is discussed that a more pronounced effect of stochastic vibration, compared with sinusoidal vibration, can occur with increasing intensity and/or exposure time.
    Notes: Summary Part I. Investigations with sinusoidal and stochastic octave-band-wide az-vibration with the frequencies or mid-band frequencies 2, 4, and 8 Hz, respectively, and the same r.m.s. of the vibration acceleration for both modes of vibration and a 30-minute exposure are reported. In order to assess the effect, measurements of the transmission, vibration-related changes of the electromyogram of the dorsal muscles, the regulation of the body-posture (stabilography), the vestibular galvanic excitability, and psychically regulated performances were used. With a controlled unrestrained body-posture the transmission is lower at the intensities 11 (2 Hz − 2.4 m/s2; 4 Hz − 1.7 m/s2; 8 Hz − 1.7 m/s2) than at the intensities 12 (2 Hz − 1.2 m/s2; 4 Hz − 0.85 m/s2; 8 Hz − 0.85 m/s2). With the resonance frequency 4 Hz this non-linearity is particularly marked. A systematic difference between sinusoidal and stochastic vibration is not observed with regard to the transmission. Only stochastic vibration of 4 Hz − 0.85 m/s2 is more strongly damped than sinusoidal vibration of the same r.m.s.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 18
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 105 (1925), S. XVII 
    ISSN: 1432-1912
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 19
    ISSN: 1420-908X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Protein kinase C (PKC) mediates a number of intracellular signal transduction pathways implicated in the pathogenesis of inflammation, including phospholipase A2-dependent arachidonic acid release and eicosanoid production. Recent studies demonstrate that the PKC inhibitor GF109203X significantly reduces a number of inflammatory processes resulting from PKC activation by the topical application of phorbol myristate acetate (PMA) to mouse ears. In this model, GF109203X significantly reduced edema at doses similar to the PKC inhibitor staurosporine, and more effectively than indomethacin, zileuton, or sodium meclofenamate. Histological and biochemical analysis of biopsies from control and drug-treated ears revealed a marked reduction in edema, infiltrating neutrophils, and levels of the neutrophil-specific marker, myeloperoxidase, in GF109203X-treated mice. Prostaglandin E2 levels were also reduced in ears treated with GF109203X. These data suggest that GF109203X is an effective antiinflammatory agent as evaluated in the PMA model of edema, and implicates PKC as a potential target in the development of novel anti-inflammatory agents.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 20
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 9 (1999), S. 601-609 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We study inclusive electroproduction on the proton at low x and low $Q^2$ using a soft and a hard Pomeron. The contribution of the soft Pomeron is based on the Stochastic Vacuum Model, in which a nonperturbative dipole-dipole cross section can be calculated by means of a gauge invariant gluon field strength correlator. To model the hard Pomeron exchange we phenomenologically extend the leading order evolution of a power-behaved structure function, $F_2 \propto x^{- \lambda}$ , proposed by López and Ynduráin. This extension allows to consider both the case $Q^2 = 0$ and the region of higher $Q^2$ on the basis of the same parametrization. A good simultaneous fit to the data on $F_2$ and on the cross section $\sigma_{\gamma p}$ of real photoproduction is obtained for $\lambda=0.37$ . With four parameters we achieve a $\chi^2/\textrm{d.o.f.} = 0.98$ for 222 data points. In addition, we use our model of the inclusive $\gamma^{\ast} p$ interaction to compute the longitudinal structure function $F_L$ .
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...