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  • 1
    Electronic Resource
    Electronic Resource
    Transition from Parabolic to Linear Kinetics in the High-Temperature Nitridation of Niobium (1999)
    Springer
    Oxidation of metals 52 (1999), S. 155-176 
    Details
    ISSN: 1573-4889
    Keywords: NITRIDATION ; NIOBIUM ; GROWTH MECHANISMS ; PARABOLIC-TO-LINEAR KINETICS TRANSITION
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The nitridation behavior of pure niobium wasinvestigated in nitrogen gas over the pressure range of10-2 to 1 torr and over the temperature range1600-2000°C. A surface layer of Nb2Nformed at 1 and 10-1 torr, obeying parabolickinetics for the former and linear kinetics for thelatter. This transition in time dependency firstmanifested itself at 1 torr in nonlinear plots ofln(Kc) vs. 1/T, consistent with an adsorption-controlledreaction. An evaluation of the flux of nitrogen acrossthe gas-metal interface is presented, comparing thekinetics of gas arrival based on the kinetic theory of gases with gas removal because of inwarddiffusion into the metal. Data from the literature areused to estimate these adsorptive and diffusive fluxesand justify the observed behavior. Nitridation ofniobium at 10-2 torr resulted in gasdissolution only, with no nitride layer beingformed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018879109285
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Object Recognition Based on Human Saccadic Behaviour (1999)
    Springer
    Pattern analysis and applications 2 (1999), S. 251-263 
    Details
    ISSN: 1433-755X
    Keywords: Key words: Computer vision; Object recognition; Saccadic behaviour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract: The automated recognition of targets in complex backgrounds is a difficult problem, yet humans perform such tasks with ease. We therefore propose a recognition model based on behavioural and physiological aspects of the human visual system. Emulating saccadic behaviour, an object is first memorised as a sequence of fixations. At each fixation an artificial visual field is constructed using a multi-resolution/ orientation Gabor filterbank, edge features are extracted, and a new saccadic location is automatically selected. When a new image is scanned and a ‘familiar’ field of view encountered, the memorised saccadic sequence is executed over the new image. If the expected visual field is found around each fixation point, the memorised object is recognised. Results are presented from trials in which individual objects were first memorised and then searched for in collages of similar objects acting as distractors. In the different collages, entries of the memorised objects were subjected to various combinations of rotation, translation and noise corruption. The model successfully detected the memorised object in over 93% of the ‘object present’ trials, and correctly rejected collages in over 98% of the trials in which the object was not present in the collage. These results are compared with those obtained using a correlation-based recogniser, and the behavioural model is found to provide superior performance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100440050033
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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