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  • 1
    Electronic Resource
    Electronic Resource
    Ferromagnetic resonance and exchange anisotropy in ferromagnetic/antiferromagnetic bilayers (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 2180-2185 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this article, we study the in-plane ferromagnetic resonance (FMR) and exchange anisotropy in a ferromagnetic (FM)/antiferromagnetic (AFM) bilayer. In the semi-infinite limit for the AFM layer, the equilibrium energy for the system is established, and then analytical expressions are derived for FMR frequency, frequency linewidth, exchange anisotropy constant, effective exchange bias, and pinning angle. Three physical parameters are important, i.e., the classical exchange bias, the interface turning coefficient, and the applied field angle. Combining the formulas derived with numerical calculation, it is shown that there are two branches of FMR modes distinguished by critical fields which depend on the interface turning the coefficient and the applied field angle. We find that the effective exchange bias depends on the applied field angle but not on its magnitude. A comparison with previously reported theoretical results is made, and experimental measurements for physical parameters are suggested. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1433927
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  • 2
    Electronic Resource
    Electronic Resource
    Thickness and angular dependencies of exchange bias in ferromagnetic/antiferromagnetic bilayers (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 92 (2002), S. 1009-1013 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A generalized Meiklejohn–Bean model in which the exchange coupling includes bilinear (direct exchange) and biquadratic (spin–flop) terms is proposed to study the exchange bias in ferromagnetic (FM)/antiferromagnetic (AFM) bilayers. For the strong antiferromagnetic anisotropy, an explicit formula for the exchange bias is derived and used to discuss the thickness and angular dependencies, and a lot of recent experimental results can thus be illustrated. The results show that both the critical thickness of the antiferromagnetic layer displaying the exchange bias and the saturation value of the exchange bias depend on the exchange coupling constants, the angle between the FM easy axis and AFM easy axis, as well as the orientation of an applied field. The bilinear and biquadratic terms will provide competitive contributions to the exchange bias, while the angular variation of the applied field can tune the exchange bias. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1486020
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  • 3
    Electronic Resource
    Electronic Resource
    Extended nature of coupled optical interface modes in Thue-Morse dielectric superlattices (2003)
    Springer
    The European physical journal 32 (2003), S. 291-296 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 63.20.Dj Phonon states and bands, normal modes, and phonon dispersion – 68.35.Ja Surface and interface dynamics and vibrations – 71.45.-d Collective effects 61.44.Br Quasicrystals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We investigate coupled optical interface modes in Thue-Morse (TM) dielectric superlattices composed of two kinds of materials with frequency-dependent dielectric functions. Four basic transfer matrices are derived in the dielectric continuum approximation. By a standard matrix operation method, the trace map of the global transfer matrix in this configuration is obtained. Under Born-von Kármán boundary conditions, the frequency spectra are calculated and their branching rules together with the quartet property are elucidated. It is further proved rigorously that nearly all eigenmodes in this framework have extended nature. The quartet of the eigenmodes is illuminated analytically. The common features and pronounced differences compared with coupled optical interface modes in periodic and Fibonacci dielectric superlattices as well as with other collective elementary excitations in TM structures are also revealed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2003-00100-1
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  • 4
    Electronic Resource
    Electronic Resource
    Free-Form Reflector Design Using Differential Evolution Algorithm (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 364-366 (Dec. 2007), p. 138-142 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: NURBS surface representation, combined with Differential Evolution (DE), enables us toperform automated non-imaging reflector design. The overall result is a simple automated nonimagingreflector design technique and only a little data such as desired illuminance distribution andsearching limits are needed. Merit functions specific to non-imaging reflector design are presented.Using different merit functions, the generated illuminance distribution can be uniform as well asconcentrated. DE is performed to obtain the reflector that generates the desired illuminancedistribution. The photometric distributions are calculated through Monte-Carlo ray tracing and theilluminance value is used to calculate the merit function value. The validity of the proposedapproach is demonstrated by optimization examples. Almost the same uniform illuminancedistribution can be obtained using the algorithm proposed in this paper as that obtained by edge-raymethod.A concentrated illuminance distribution can also be generated using the algorithmproposed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.364-366.138.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Fast Computing Model for Thermal Field of Auto Lamp (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 364-366 (Dec. 2007), p. 783-788 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Thermal field analysis for automotive lamps is a complicated thermodynamics problem.According to the features of structure and lighting process of automotive lamps, a simple andconvenient model is put forward here for analyzing their thermal field. Under certain assumptions,it simplifies the complicated geometrical structure to the relative simple cavities and only considersthe influence of thermal conduction and thermal radiation as main forms of heat transfer for thermalfield of the lamps. The consistency of numerical analysis and actual test demonstrates that thismodeling method calculates thermal field of the lamps quickly and perfectly, and indicates itspractical signification
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.364-366.783.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Research on High-Temperature Corrosion-Resistance Performance of Exhaust Pipe of Heavy Duty Vehicle (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 373-374 (Mar. 2008), p. 589-592 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The exhaust pipe of a heavy duty vehicle, due to its harsh operating environment, issubject to corrosion caused by high temperature oxidization, chlorination and sulfuration, therefore,corrosion occurs very easily, which affects normal operation of the engine. The exhaust pipe of theengine can be protected by means of electro-thermal explosion spray-coating technique. Thecorrosion-resistant ability of coating in high temperature environment is surveyed respectively. Themicro organizational structure of coating is studied in combination with SEM, EDS and other teststo search for corrosion-resistant principle of the coating in an attempt to improve thecorrosion-resistance of the exhaust pipe of the engine
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.373-374.589.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    A Novel Living-Cell Imaging System Design with Ultra-Long Working Distance and High Numerical Aperture (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 364-366 (Dec. 2007), p. 1077-1082 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Microscopy is an important tool in biology and medicine, but it is often limited to opticalimaging structures with high numerical aperture(NA) with a short working distance(wd), forexample NA = 0.6 and wd 〈1 mm are usual. The common microscope objective is inadequate forimaging of living cells in culture as an optical imaging structure with both high numerical apertureand long working distance is required. In this study, a novel optical design has been developed tomeet the long working distance and high resolution power imaging of living cells in a vessel with ahigh culture solution thickness, where cells need to be developed in about 48 hours or a week. Thedeveloped optical design was characterized by an ultra-long working distance (wd 〉13.5 mm) andhigh numerical aperture (NA = 0.7). This optical imaging system is not only good for thesubcellular imaging of free-floating cells in culture, but also for the imaging of cells attached at asurface of vessel
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.364-366.1077.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Nanocrystallization of Drill Hole Surface by High Speed Drilling (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Journal of metastable and nanocrystalline materials Vol. 24-25 (Sept. 2005), p. 601-604 
    Details
    ISSN: 1422-6375
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/43/transtech_doi~10.4028%252Fwww.scientific.net%252FJMNM.24-25.601.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Partial melting zones in the crust in southern Tibet from magnetotelluric results (1986)
    [s.l.] : Nature Publishing Group
    Nature 319 (1986), S. 310-314 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Tibetan Plateau is the largest topographical mass on the Earth, with an unusually high average elevation (5 km above sea level). Although its uplift must be related to the Himalayan continental collision and penetration of India into Asia1, there is considerable debate over its present ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/319310a0
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  • 10
    Electronic Resource
    Electronic Resource
    Role of Strain Gradient and Dynamic Transformation on the Formation of Nanocrystalline Structure Produced by Severe Plastic Deformation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 2787-2792 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Formation of nanocrystalline structure by severe plastic deformation has studiedextensively. Although ultra fine grained structure (grain size larger than 100 nm) had been obtainedin many processes such as heavy cold rolling, equal channel angular pressing (ECAP) or accumulativeroll bonding (ARB), the formation of nano grained structure (〈 100 nm) is limited to processes suchas ball milling, shot peening or drilling. In the present study, high pressure torsion (HPT) deformationand drilling were carried out to understand the conditions necessary to obtain nano grained structurein steels. The results of HPT experiments in pure Fe showed that HPT has superior ability ofstrengthening and grain refinement probably due to a strain gradient but the saturation of grainrefinement occurs before reaching nano grained structure. Drilling experiments in high carbonmartensitic steel revelaed that nano grained ferrite forms at the drilled hole surface only when thetransformation from ferrite to austenite takes place during drilling. Considering various otherprocesses by which nano grained ferrite was produced, it is proposed that heavy strains with largestrain gradients together with dynamic transformation are necessary to reach nano grained ferritestructure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.2787.pdf
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