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  • 1
    Digitale Medien
    Digitale Medien
    A microcomputer-based solid-state nuclear track image analyzer (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 771-778 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A microcomputer-based image processing system has been developed to use with solid-state nuclear track detectors for number counting, area measurement, and location identification. The image digitizer is designed to interface with a microcomputer and a standard black and white TV camera for data acquisition. A spatial dependent segmentation algorithm is proposed for track identification under nonuniform illumination and the low track-pixel population conditions. The system has been tested using Lexan samples irradiated by a Cf-252 spontaneous fission source. The counting accuracy is approximately 3% with a long term stability of 5%. Efficiency calibration was performed using samples with track densities up to 104/mm2. Results indicate that the proposed track identification scheme tends to reduce the track overlap effect and the system behaves as a nonparalyzable counting system. For track densities below 3000/mm2, either a paralyzable or a nonparalyzable counter model can be established with an accuracy better than 0.5%. For track densities below 1500/mm2, the track registration efficiency is in good agreement with manual counting results.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1141017
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  • 2
    Digitale Medien
    Digitale Medien
    Effect of host diet on acceptance of eastern spruce budworm eggs by Trichogramma minutum (1997)
    Springer
    Entomologia experimentalis et applicata 84 (1997), S. 41-47 
    Details
    ISSN: 1570-7458
    Schlagwort(e): egg parasitoid ; host acceptance ; preference ; Trichogramma minutum/ ; Choristoneura fumiferana/ ; Abies balsamea/ ; biological control
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The acceptance behaviour of the parasitic wasp, Trichogramma minutum Riley (Hymenoptera: Trichogrammatidae), was studied on two types of egg masses of eastern spruce budworm (SBW), Choristoneura fumiferana Clemens. Host eggs were obtained from moths that had been fed balsam fir or artificial diet during their larval stages. Parasitoids were reared from both types of hosts. Host acceptance assays were conducted where females were provided with a single egg mass and with a choice between egg masses. Regardless of the parasitoid's rearing host, females parasitised hosts reared from artificial diet more often than those from balsam fir. Response was consistent in both no-choice and choice assays. Rejection of hosts tended to occur during the examining stage of behaviour, suggesting that acceptability is judged externally. If a host was accepted, the same number of eggs were laid per egg mass regardless of treatment.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1003044813827
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  • 3
    Digitale Medien
    Digitale Medien
    A bounded beam solution for the pulse-echo transducer response of an arbitrary on-axis scatterer in a fluid
    Amsterdam : Elsevier
    Wave Motion 19 (1994), S. 159-169 
    Details
    ISSN: 0165-2125
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0165-2125(94)90064-7
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  • 4
    Digitale Medien
    Digitale Medien
    Comparative study on pathogenesis of selective cerebral lesions in carbon monoxide poisoning and nitrogen hypoxia in cats (1982)
    Springer
    Acta neuropathologica 56 (1982), S. 265-272 
    Details
    ISSN: 1432-0533
    Schlagwort(e): Carbon monoxide encephalopathy ; Nitrogen hypoxia ; Selective white matter lesion
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Since in a previous study hypoxia and subsequent hypotension were considered to be essential for the pathogenesis of carbon monoxide encephalopathy (CO-encephalopathy), experiments were conducted to see whether a combination of nitrogen hypoxia and subsequent systemic hypotension of similar degree and duration as in the previous experimental CO poisoning could induce the same lesion in the CNS of cats. The partial pressure of blood oxygen was reduced to less than 26 mm Hg by increasing the concentration of nitrogen in N2/O2 gas to be inhaled in 1.5 h and then the aortic blood pressure (BP) was reduced to 60–80 mm Hg by blood depletion and ganglion-blockage for 1 h. In 11 of the 15 cats, lesions were produced in the CNS which were similar by light and electron microscopy to those in CO-encephalopathy. In control groups which were treated by hypoxemia only, hypotension only or a combination of CO2-gas inhalation and hypotension without hypoxemia, such lesions were not found in the cerebral white matter. Considering the pathogenesis of lesions in the cerebral white matter in both nitrogen hypoxia and CO-poisoning, two factors, i.e., hypoxemia and subsequent systemic hypotension, are common and essential. Further, the enormous vasodilation in the cerebral white matter induced by hypoxemia and subsequent drop in BP seem to cause a more severe circulatory disturbance in the cerebral white matter than in the cortex.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00691257
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  • 5
    Digitale Medien
    Digitale Medien
    A frequency domain ultrasonic model for the pulse-echo transducer response of an arbitrary scatterer in a fluid (1993)
    Springer
    Research in nondestructive evaluation 5 (1993), S. 111-122 
    Details
    ISSN: 1432-2110
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A very general model formulation is presented in the frequency domain for the pulse-echo ultrasonic response of an arbitrary scatterer in a fluid. The transducer is modeled as a piston source and the scatterer can be located anywhere in the transducer wavefield. The model is computationally efficient and is shown to agree well with initial experiments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01606360
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  • 6
    Digitale Medien
    Digitale Medien
    Ultrasonic flaw classification in weldments using probabilistic neural networks (1992)
    Springer
    Journal of nondestructive evaluation 11 (1992), S. 69-77 
    Details
    ISSN: 1573-4862
    Schlagwort(e): Welds ; flaw classification ; ultrasonics ; neural networks
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Mathematik
    Notizen: Abstract A probabilistic neural network is used here to classify flaws in weldments from their ultrasonic scattering signatures. It is shown that such a network is both simple to construct and fast to train. Probabilistic nets are also shown to be able to exhibit the high performance of other neural networks, such as feed forward nets trained via back-propagation, while possessing important advantages of speed, explicitness of their architecture, and physical meaning of their outputs. Probabilistic nets are also demonstrated to have performance equal to common statistical approaches, such as theK-nearest neighbor method, while retaining their unique advantages.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00568290
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