Kaiserslautern, Rheinland-Pfalz, Germany

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Department of Computer Science
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Department of Physics
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Department of Mathematics
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    ABSTRACT: We study the heat-induced magnetization dynamics in a toy model of a ferrimagnetic alloy, which includes localized spins antiferromagnetically coupled to an itinerant carrier system with a Stoner gap. We determine the one-particle spin-density matrix including exchange scattering between localized and itinerant bands as well as scattering with phonons. While a transient ferromagneticlike state can always be achieved by a sufficiently strong excitation, this transient ferromagneticlike state only leads to magnetization switching for model parameters that also yield a compensation point in the equilibrium $M(T)$ curve.
    Physical Review B 03/2015; 91(10). DOI:10.1103/PhysRevB.91.100402
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    ABSTRACT: A stand-alone technical product in many cases is not sufficient to fulfill customers’ requirements. Machine tool manufacturers have already reacted to this fact by offering combinations of products and services, commonly known as technical Product-Service Systems (PSS). Today, nearly every machine tool manufacturer offers PSS. In order to stay competitive, quality leadership of PSS is a promising competitive strategy for machine tool manufacturers. Thus, it is necessary to develop a PSS specific quality management. However, key performance indicators and criteria for assessing the quality of PSS in the machine tool industry are currently missing. The aim of this paper is to present a customer-oriented approach for assessing the quality of PSS in the machine tool industry. This serves to ensure and continuously improve a long-term business relationship between a PSS provider and its customers. Use cases from the machine tool industry build the basis for this paper. To begin with, existing quality criteria of products and services in the machine tool industry are analyzed. These criteria are gathered by interviews with machine tool manufacturers, customer surveys and literature research. Next, interdependencies between product and service quality are identified. Then PSS-specific quality criteria are developed, which consider product and service quality criteria as well as their interdependencies. Finally, key performance indicators are presented in order to assess and benchmark the quality of PSS.
    12/2014; 16:253–258. DOI:10.1016/j.procir.2014.06.002
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    ABSTRACT: The surface integrity of ground workpieces is not only influenced by the chosen parameters, but also by the coolant supply. Coolant supply in grinding is mainly governed by the nozzles used and their parameters. However, the cooling efficiency in grinding can also be enhanced by altering the macro-topography of the grinding wheel itself. In this paper three different grinding wheels using the same nozzle parameters are compared with respect to their cooling efficiency and hence their impact on the surface integrity of the ground workpieces. Besides a standard grinding wheel with continuous layer, a slotted grinding wheel as well as a segmented grinding wheel are presented and their respective cooling efficiency is evaluated. It is shown that by altering the macro-topography of a grinding wheel the resulting surface integrity can be influenced positively as well as negatively.
    12/2014; 13:8–12. DOI:10.1016/j.procir.2014.04.002


  • Address
    Gottlieb-Daimler-Str., 67653, Kaiserslautern, Rheinland-Pfalz, Germany
  • Head of Institution
    Prof. Dr. Helmut J. Schmidt
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