Abstract: The invention relates to a method and a system for providing a decision support for users for selecting drilling and cutting elements for use in a construction material region, wherein areas of application of aggregate materials for concrete as a factor of the different drilling and cutting resistances of the aggregate materials in the zones are grouped in a geographical information storage medium. In this geographical information storage medium, a reference number is assigned to each of the zones, which represent a drilling and cutting resistance of a specific magnitude. The drilling and cutting elements to be used in an area of application of aggregate materials of specific drilling and cutting resistance are provided with a reference number corresponding to the reference number of the zones.

Abstract: A sharpening method and associated sharpening means (1) for a drilling tool (2), which is set with grinding segments (3) comprised of hard material. The sharpening means (1) is filled with abrasive materials (6) and is chordlike.

Abstract: The invention relates to a process for production of a sintered oxide ceramic of composition CexMyDzO2-a with dense structure without open porosity or with a predetermined porosity. The first doping element M is at least one element of the group consisting of the rare earths but M≠Ce, alkali and earth alkali metals. The educts are used with a second doping element D of at least one metal of the group consisting of Cu, Co, Fe, Ni and Mn, in the submicron particle size or as a salt solution, and sintered at a temperature in the range of 750-1250° C. into an oxide ceramic with extremely fine structure of a grain size of maximum around 0.5 &mgr;m.

Abstract: The invention relates to a method and a system for providing a decision support for users for selecting drilling and cutting elements for use in a construction material region, wherein areas of application of aggregate materials for concrete as a factor of the different drilling and cutting resistances of the aggregate materials in the zones are grouped in a geographical information storage medium. In this geographical information storage medium, a reference number is assigned to each of the zones, which represent a drilling and cutting resistance of a specific magnitude. The drilling and cutting elements to be used in an area of application of aggregate materials of specific drilling and cutting resistance are provided with a reference number corresponding to the reference number of the zones.

Abstract: The invention relates to a process for production of a sintered oxide ceramic of composition CexMyDzO2-a with dense structure without open porosity or with a predetermined porosity. The first doping element M is at least one element of the group consisting of the rare earths but M≢Ce, alkali and earth alkali metals. The educts are used with a second doping element D of at least one metal of the group consisting of Cu, Co, Fe, Ni and Mn, in the submicron particle size or as a salt solution, and sintered at a temperature in the range of 750-1250° C. into an oxide ceramic with extremely fine structure of a grain size of maximum around 0.5 &mgr;m.