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  • Polymer and Materials Science  (2)
  • 134Cs  (1)
  • 79.40  (1)
  • topological maps  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Learning View Graphs for Robot Navigation (1998)
    Springer
    Autonomous robots 5 (1998), S. 111-125 
    Details
    ISSN: 1573-7527
    Keywords: visual navigation ; topological maps ; environment modeling ; exploration ; cognitive maps ; mobile robots ; omnidirectional sensor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We present a purely vision-based scheme for learning a topological representation of an open environment. The system represents selected places by local views of the surrounding scene, and finds traversable paths between them. The set of recorded views and their connections are combined into a graph model of the environment. To navigate between views connected in the graph, we employ a homing strategy inspired by findings of insect ethology. In robot experiments, we demonstrate that complex visual exploration and navigation tasks can thus be performed without using metric information.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008821210922
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  • 2
    Electronic Resource
    Electronic Resource
    Energy distribution of post-accelerated electrons field-emitted from carbon fibres (1977)
    Springer
    Applied physics 12 (1977), S. 197-202 
    Details
    ISSN: 1432-0630
    Keywords: 79.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An electron gun system with post-acceleration is described suitable to operation with a carbon fibre field-emission tip. The system was tested in an electron optical bench with a vacuum pressure of about 10−6 torr. The electron current was most stable if the current to the extraction electrode was minimized. The half width of the energy distribution of the electrons accelerated up to 30 keV was 215 meV for small currents (≈10−9A). The half width of the distribution increases with growing emission current. This increase may be attributed to instabilities in the surface structure due to ion bombardment and to the circumstance that more than one emission centre contributes to the electron current.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00896148
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  • 3
    Electronic Resource
    Electronic Resource
    Prevention of enteral radiocesium absorption by hexacyanoferrates(II) in piglets (1988)
    Springer
    Cellular and molecular life sciences 44 (1988), S. 502-504 
    Details
    ISSN: 1420-9071
    Keywords: Hexacyanoferrate(II) ; 134Cs ; cesium absorption ; biological half-life ; piglet
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The efficacy of different hexacyanoferrates(II) in preventing the enteral absorption of134Cs was studied in piglets. As compared to the controls, oral application of134Cs together with KFe[Fe(CN)6], NH4Fe[Fe(CN)6], or Fe4[Fe(CN)6]3 resulted in a strong reduction of the134Cs-uptake by more than 97%. The decrease in enteral absorption depends on the dose of administered hexacyanoferrate(II), whereas differences between the compounds under study were small. The biological half-life of134Cs in non-hexacyanoferrate(II) treated piglets was 21.6±3.3 days (mean±SD).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01958927
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  • 4
    Electronic Resource
    Electronic Resource
    Verschleißkorrosion von Eisenwerkstoff-Kunststoffpaarungen in Trichlorethylen (1980)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 31 (1980), S. 191-196 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Erosion corrosion of ferrous material/plastic couples in trichloroethyleneLow alloy steel is attacked by wear corrosion if H2O and O2 are present; high alloy steel too, if hard wear particles have an abrasive effect on the protecting passive layer. If the HKW contents stabilisers in a sufficient degree, only abrasive wear can be observed.
    Notes: Niedrig legierter Stahl wird bei Anwesenheit von H2O und O2 durch Verschleißkorrosion angegriffen; hochlegierter auch, wenn harte Verschleißpartikel abrasiv auf die schützende Passivschicht einwirken. Bei Anwesenheit von Stabilisatoren in ausreichendem Maße findet nur abrasiver Verschleiß statt.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19800310308
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  • 5
    Electronic Resource
    Electronic Resource
    Experimental results with Ceramic Components in passenger-car diesel enginesVeröffentlicht aus: “Ceramic Materials and Components for Engines”, edited by W. Bunk and H. Hausner. Verlag: Deutsche Keramische Gesellschaft e.V., Postfach 1226, 5340 Bad Honnef 1. (1988)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 19 (1988), S. 23-27 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19880190104
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