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Performance of a Surface Densified P/M Gear for a Passenger Car Gear Box
Rau Gunter,Sigl Lorenz S.,Mork Gerold,Wattenberg Frank 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Selective surface densification is a tool for improving the mechanical properties of PM steels, such that the requirements for highly loaded gears can be matched. This paper describes the manufacturing and the properties of a helical P/M gear. The gear performance was evaluated on a 3-shaft back to back test rig, on a load bearing test rig and on a sound test bench. The results of these tests are presented and compared to data obtained from solid steel gear with identical geometry and surface quality. This comparison indicates that P/M gears have a load bearing capacity and noise level which are both well comparable to solid steel gears.
Implications of strong intergalactic magnetic fields for ultrahigh-energy cosmic-ray astronomy
Alves Batista, Rafael,Shin, Min-Su,Devriendt, Julien,Semikoz, Dmitri,Sigl, Guenter American Physical Society 2017 Physical review. D Vol.96 No.2
<P>We study the propagation of ultrahigh-energy cosmic rays in the magnetized cosmic web. We focus on the particular case of highly magnetized voids (B similar to nG), using the upper bounds from the Planck satellite. The cosmic web was obtained from purely magnetohydrodynamical cosmological simulations of structure formation considering different power spectra for the seed magnetic field in order to account for theoretical uncertainties. We investigate the impact of these uncertainties on the propagation of cosmic rays, showing that they can affect the measured spectrum and composition by up to. similar or equal to 80% and. similar or equal to 5%, respectively. In our scenarios, even if magnetic fields in voids are strong, deflections of 50 EeV protons from sources closer than similar to 50 Mpc are less than 15 degrees in approximately 10-50% of the sky, depending on the distribution of sources and magnetic power spectrum. Therefore, UHECR astronomy might be possible in a significant portion of the sky depending on the primordial magnetic power spectrum, provided that protons constitute a sizeable fraction of the observed UHECR flux.</P>
Lee, S. B.,Lee, J.-H.,Cho, P.-S.,Kim, D.-Y.,Sigle, W.,Phillipp, F. WILEY-VCH Verlag 2007 Advanced Materials Vol.19 No.3
<B>Graphic Abstract</B> <P>A correlation between a grain-boundary structural transition and a change in electrical properties is demonstrated, using a SrTiO<SUB>3</SUB> bicrystalline grain boundary as a model system. A grain-boundary faceting–defaceting transition is seen between 1500 and 1600 °C (the grain-boundary of the bicrystal annealed at 1600 °C for one day is shown in the figure) accompanied by an abrupt change in grain-boundary electrical impedance. <img src='wiley_img/09359648-2007-19-3-ADMA200602153-content.gif' alt='wiley_img/09359648-2007-19-3-ADMA200602153-content'> </P>
Lee, S.B.,Lee, J.H.,Cho, Y.H.,Kim, D.Y.,Sigle, W.,Phillipp, F.,van Aken, P.A. Elsevier Science 2008 ACTA MATERIALIA Vol.56 No.18
Dependence of the electrical properties on grain-boundary plane orientation is examined by a combination of high-resolution transmission electron microscopy, impedance spectroscopy, and electron energy-loss spectrometry using two kinds of SrTiO<SUB>3</SUB> Σ5 ([100]/36.8<SUP>o</SUP>) bicrystalline grain boundaries: symmetric (310) (18.4<SUP>o</SUP>/18.4<SUP>o</SUP>) and asymmetric (8.4<SUP>o</SUP>/28.4<SUP>o</SUP>). While the symmetric grain boundary is observed to be straight with the symmetric (310)//(310) plane orientation, the asymmetric grain boundary is faceted into symmetric (310)//(310) and (210)//(210), and asymmetric (100)//(430). Grain-boundary impedance is observed only in the asymmetric grain boundary, and the electron energy-loss spectrometry quantification indicates that the asymmetric (100)//(430) facets are more oxygen-deficient than the symmetric ones. The results suggest that the asymmetric (100)//(430) facets are the most resistive among the three different facets.