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  • 1
    Digitale Medien
    Digitale Medien
    Trapped ion temperature gradient driven instabilities with bounce resonance (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 3757-3763 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A kinetic analysis of ion temperature gradient modes with the trapped ion bounce resonance in tokamaks is presented under the long-wavelength limit. The dispersion relations of the toroidal and slab branches are derived by employing two-scale expansion, and their eigenfunctions are obtained analytically. The growth rates and stability thresholds of the more unstable toroidal and slab ion modes are evaluated in the cases with and without trapped electron dynamics. It is found that the minority trapped ion bounce resonances possess approximately the same effects on the toroidal and slab ion modes as the majority ion transit resonances. The nonadiabatic trapped electron dynamics does also strongly affect the toroidal ion mode while it affects the slab branch, the trapped electrons have a destabilizing effect on these ion modes. In addition, the effects of trapped electron temperature gradient on the trapped ion temperature gradient modes are considered. For high collisionality, the trapped electron temperature gradient destabilizes toroidal and slab ion modes. On the contrary, it plays a role of stabilizing to the toroidal and slab ion modes in the case of very low collisionality. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.871445
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  • 2
    Digitale Medien
    Digitale Medien
    High-resolution study of magnetization and susceptibility by spin-polarized scanning tunneling microscopy (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6475-6477 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We present static measurements of the domain structure and dynamic results on domain wall motion and local susceptibility obtained by spin-polarized scanning tunneling microscopy. The topography and the magnetic structure of the sample are recorded simultaneously with down to 10 nm resolution. With this technique, domain wall movement on Co(0001) is studied in situ. In some cases, the magnetization of the sample is locally influenced by the stray field of the tip. Measuring higher harmonics in the tunneling current allows one to quantify this influence and measure magnetic susceptibilities on similar scales. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.372742
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  • 3
    Digitale Medien
    Digitale Medien
    Gas phase electronic spectrum of C3H in the visible (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 6913-6919 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The electronic spectrum of C3H has been observed by means of a resonant two color two photon ionization technique sampling a supersonic plasma source. On the basis of ab initio calculations, vibrational and rotational analysis, the complex vibronic system observed in the visible and near UV is assigned to three electronic transitions, A˜ 2A′←X 2Π, B˜ 2A″←X 2Π and C˜ 2A″←X 2Π of C3H. Potential curves along the CCH bending coordinate have been obtained because of its role for the electronic spectrum and dynamics of C3H. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1404391
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  • 4
    Digitale Medien
    Digitale Medien
    Preliminary study of the crack healing and strength recovery of Al2O3-matrix composites (2004)
    PO Box 1354, 9600 Garsington Road, Oxford OX4 2XG, UK. : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 27 (2004), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Notizen: This study focused on the crack-healing behaviour of three commercial Al2O3–ceramic-matrix composites: TiCP/Al2O3, ZrO2/Al2O3 and SiCW/Al2O3. Vickers indentation was used to introduce surface flaws with different loads of 49, 98 and 196 N. Then the cracked specimens were annealed in air for 1 h at 1000, 1200 and 1400 °C. The annealing treatment was also conducted at 1200 °C in vacuum for 1 h. Results showed that the annealing treatments increased the indentation strength, but the extent of the increase was different. When annealed in air, the main crack-healing mechanism of TiCP/Al2O3 and SiCW/Al2O3 composites was chemical reaction. When annealed in vacuum, stress relaxation caused much less strength recovery. The main crack-healing mechanism of ZrO2/Al2O3 was the existence of low melting eutectic and the rearrangement of grains caused by ZrO2(m)→ ZrO2(t) transformation in the crack-opening process zone. The effects of annealing temperature, atmosphere and indentation load on the degree of strength recovery were all related to the crack-healing mechanisms.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-2695.2004.00725.x
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  • 5
    Digitale Medien
    Digitale Medien
    A statistical model of fatigue damage evolution in particulate-reinforced metal-matrix-composites (2000)
    Oxford, UK : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 23 (2000), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Notizen: A statistical model of fatigue damage evolution has been developed for particulate-reinforced metal-matrix-composites (MMCs) by taking into considerations both the initial damage distribution and the effect of particulate reinforcement on fatigue damage development. The growth of microscopically fatigue-damaged regions in particulate-reinforced MMCs is considered as a stochastic process, and both the non-equilibrium statistical method and minimum strength principle are used to establish the evolution equation of fatigue damage. The fatigue damage evolution equation developed in the present study characterizes not only the kinetic process of fatigue damage evolution but also sets up the relationship between the mechanism of fatigue damage growth of the microscopically damaged regions and the result of fatigue damage, i.e. degradation of mechanical properties of particulate-reinforced MMCs. A new expression for calculating the cumulative fatigue damage and a new formula for predicting the average fatigue strength of the particulate-reinforced MMCs are derived. Experimental data of 2080Al/SiCp composites are analysed and compared with results obtained with the present model. It is shown that the experimental results can be described well by the calculations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1460-2695.2000.00337.x
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  • 6
    Digitale Medien
    Digitale Medien
    A low-cycle fatigue life prediction model of ultrafine-grained metals (2002)
    Oxford, UK : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 25 (2002), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Notizen: A (high strain) low-cycle fatigue (LCF) life prediction model of ultrafine-grained (UFG) metals has been proposed. The microstructure of a UFG metal is treated as a two-phase ‘composite’ consisting of the ‘soft’ matrix (all the grain interiors) and the ‘hard’ reinforcement (all the grain boundaries). The dislocation strengthening of the grain interiors is considered as the major strengthening mechanism in the case of UFG metals. The proposed model is based upon the assumption that there is a fatigue-damaged zone ahead of the crack tip within which the actual degradation of the UFG metal takes place. In high-strain LCF conditions, the fatigue-damaged zone is described as the region in which the local cyclic stress level approaches the ultimate tensile strength of the UFG metal, with the plastic strain localization caused by a dislocation sliding-off process within it. The fatigue crack growth rate is directly correlated to the range of the crack-tip opening displacement. The empirical Coffin–Manson and Basquin relationships are derived theoretically and compared with experimental fatigue data obtained on UFG copper (99.99%) at room temperature under both strain and stress control. Good agreement is found between the model and the experimental data. It is remarkable that, although the model is essentially formulated for high strains (LCF), it is also found to be applicable at low strains in the high-cycle fatigue (HCF) regime.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1460-2695.2002.00564.x
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  • 7
    Digitale Medien
    Digitale Medien
    The origin of multiple superconducting gaps in MgB 2 (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 423 (2003), S. 65-67 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Magnesium diboride, MgB2, has the highest transition temperature (Tc = 39 K) of the known metallic superconductors. Whether the anomalously high Tc can be described within the conventional BCS (Bardeen–Cooper–Schrieffer) framework has ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/nature01619
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  • 8
    Digitale Medien
    Digitale Medien
    Spectroscopic evidence for a pseudogap in the normal state of underdoped high- T c superconductors (1996)
    [s.l.] : Nature Publishing Group
    Nature 382 (1996), S. 51-54 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] In ARPES, photons incident upon a sample cause electrons to be ejected, whose energies and momenta are measured. From this one obtains the electronic excitation spectrum of the sample. Our experiments were carried out at the Synchrotron Radiation Center, Wisconsin, following procedures described ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/382051a0
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  • 9
    Digitale Medien
    Digitale Medien
    Microscopic electronic inhomogeneity in the high- T c superconductor Bi 2 Sr 2 CaCu 2 O 8+ x (2001)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 413 (2001), S. 282-285 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The parent compounds of the copper oxide high-transition-temperature (high-Tc) superconductors are unusual insulators (so-called Mott insulators). Superconductivity arises when they are ‘doped’ away from stoichiometry. For the compound ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/35095012
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  • 10
    Digitale Medien
    Digitale Medien
    Destruction of the Fermi surface in underdoped high- T c superconductors (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 392 (1998), S. 157-160 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The Fermi surface—the set of points in momentum space describing gapless electronic excitations—is a central concept in the theory of metals. In this context, the normal ‘metallic’ state of the optimally doped high-temperature superconductors is not very unusual: above ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/32366
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