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: 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
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    ABSTRACT: In this paper, measurement results of the embodied energy of a corundum grinding wheel and a coated cemented carbide end mill are presented. Both tools are industrial standard regarding geometry and composition. The single process steps and their energy demands for the manufacturing of both tools is analyzed and compared. In addition, based on literature values, their respective wear behavior machining Inconel 718 is compared. Despite a much higher embodied energy of the grinding wheel compared to the end mill, it is shown that the required embodied energy to machine a specific volume of material (J/mm3) is considerably lower for the grinding wheel.
    12/2014; 15:74–79. DOI:10.1016/j.procir.2014.06.037


  • Address
    Gottlieb-Daimler-Str., 67653, Kaiserslautern, Rheinland-Pfalz, Germany
  • Head of Institution
    Prof. Dr. Helmut J. Schmidt
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Top publications last week by downloads

IEEE Communications Magazine 05/2014; 52(5):26-35. DOI:10.1109/MCOM.2014.6815890
Food and Chemical Toxicology 02/2002; 40(2-3):193-236. DOI:10.1016/S0278-6915(01)00118-1

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