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  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Charakterystyka wybranych cech funkcjonalnych tachimetrów elektronicznych
    (Wydawnictwa AGH, 2006) Buśko, Małgorzata 
    The paper includes a brief characteristics of the selected design solutions of modern electronic tacheometers. These instruments are systematically improved due to scientific progress in such fields like electronics, optics, information technology and precision mechanics. The subject of the detailed discussion in this paper was a principle of operation of the main axis vertical swing compensation system of the instrument, the system to enable automatic aiming of the tacheometer telescope at the reflector, and tracking of the moving prism and possibility to conduct distance measurements without using a reflector. Tacheometers made by Topcon, incorporating the above mentioned features, were used in field and laboratory surveys. Laboratory distance measurements were related to the reference values, obtained based on measurements taken by laser interferometer HP5529A. The performed measurements enabled to formulate the conclusions, regarding the application capabilities and limits of tacheometers in geodetic practice, particularly in the aspect of non-prism measurements.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    The impact of temperature on furan resin and binder structure
    (2012) Bobrowski, Artur; Grabowska, Beata
    Exposure to high temperature causes a series of structural changes in binders used to prepare moulding and core sands. These changes may consist in the formation of new bonds, changes to their character or a transformation of the structure which may be accompanied, for example, by the destruction (disappearance) of some chemical bonds. They have a significant impact on the mechanical and technological properties of sands, but also on their environmental noxiousness or the ability to reclaim the sand. This article presents the results of infrared structural examinations of two furan resins and two binders produced based on those resins. Both pure resins and binders made of them were exposed to temperature. Changes taking place in their structure in the 25-200 °C temperature range were determined using infrared spectroscopy.