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  • 1
    Electronic Resource
    Electronic Resource
    Spin-polarized transport through a ZnSe/Zn1−xMnxSe heterostructure under an applied electric field (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 6614-6617 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate spin-dependent transport through a band-gap-matched ZnSe/Zn1−xMnxSe heterostructure with a single paramagnetic layer under influence of both an electric and a magnetic field. It is shown that the magnetic-field tunable potential and its symmetry in this system can be significantly modulated by the electric field, which results in obvious dependence of the magnitude of the electronic spin polarization on the electric field magnitude. The results obtained in this work might shed light on the development of new electron-polarized devices. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1322070
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  • 2
    Electronic Resource
    Electronic Resource
    Tunneling time of spin-polarized electrons in ferromagnet/insulator (semiconductor) double junctions under an applied electric field (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 1318-1323 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Based on the group velocity concept and the two-band model, we investigated tunneling properties of spin-polarized electrons traversing ferromagnetic/insulator (semiconductor) double junctions under the influence of an external electric field. The tunneling time and the transmission coefficient, as well as the spin polarization, were calculated and examined. Effects of the electric field and quantum size are also considered. The results indicate that the tunneling time strongly depends on the spin orientation of tunneling electrons. In a wide range of incident energy, spin-down electrons spend a longer time tunneling through the structure than spin-up ones, and the difference of the tunneling time Δτ between electrons with opposite spin orientation is very sensitive to the incident energy in the lower energy region. Moreover, the variation of Δτ with the increasing of the incident energy shows pronounced oscillations for certain applied bias and structural size. The results also indicate that spin polarization shows frequent wide-range oscillations and its magnitude decays slowly with the increasing of the incident energy, which reveal that the spin polarization in ferromagnetic/insulator (semiconductor) junctions possesses quite different properties from those exhibited in semiconductor electric-barrier or magnetic-barrier structures as well as semiconductor/semimagnetic semiconductor hybrid heterostructures. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1427140
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  • 3
    Electronic Resource
    Electronic Resource
    Numerical study of the nonlinear evolution of toroidicity-induced Alfvén eigenmodes (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 226-237 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A simulation code for the nonlinear evolution of the toroidicity-induced Alfvén eigenmodes (TAE) is implemented based on a collisional δf simulation method [Phys. Plasmas 4, 3591 (1997)] and a Hamiltonian formulation of the guiding-center motion [Phys. Fluids 27, 2455 (1984)]. The nonlinear behavior of TAE in the regime of weak damping is studied numerically and compared with the predictions of theoretical analysis. The theoretical prediction for the scaling of the saturation amplitude with the linear growth rate and the collision rate is well confirmed. The enhancement of the saturation level due to resonance overlapping when there are multiple modes is observed and analyzed. The simulation code is applied to the alpha-driven TAE's in the Tokamak Fusion Test Reactor (TFTR) [Plasma Phys. Controlled Fusion 26, 11 (1984)]. An estimate of the background damping rate is obtained from the simulation result. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873275
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  • 4
    Electronic Resource
    Electronic Resource
    Two-dimensional horn imaging arrays (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1592-1592 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A two-dimensional horn imaging array has been demonstrated at 242 and 93 GHz. In this configuration, a dipole is suspended in a pyramidal horn, fabricated by an anisotropic chemical etch technique, on a 1-μm silicon-oxynitride membrane. This approach leaves room for low-frequency lines and processing electronics. Pattern measurements on a 1.45-λ imaging array agree well with theory, show no sidelobes, and a 3-dB beamwidth of 35° and 46° for the E and H planes, respectively. Application areas include a superconducting tunnel-junction receiver for radio astronomy and imaging arrays for real-time electron density mapping in fusion plasmas. Support for this project was provided by DOE contract DE-FG03-86-ER-53225 (subcontracted from U.C.L.A.).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140156
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  • 5
    Electronic Resource
    Electronic Resource
    Resonance splitting effect and wave-vector filtering effect in magnetic superlattices (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 4545-4547 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The resonance splitting and wave-vector filtering for electron tunneling through magnetic superlattices are investigated theoretically. Two kinds of magnetic superlattices are examined. One is a periodic arrangement of identical magnetic barriers while the other is periodically juxtaposed with two different magnetic barriers. In general, one resonant domain in the former splits into two resonant domains in the latter. It is confirmed that both the resonance splitting and wave-vector filtering strongly depend on the structure of the magnetic superlattices. The numerical results indicate that the magnetic superlattice, which is a periodic arrangement of two different magnetic barriers, possesses stronger wave-vector filtering. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367218
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  • 6
    Electronic Resource
    Electronic Resource
    Resonant tunneling in step-barrier structures under an applied electric field (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 918-924 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Resonant tunneling in step-barrier structures is investigated by using the transfer-matrix technique. The formulas for the transmission coefficient and the current density are derived when taking into account the coupling between components of the motion of an electron in directions parallel and perpendicular to the interfaces. By making a detailed comparison of resonant tunneling among single square-barrier structures, asymmetric double-barrier structures, and step-barrier structures, the tunneling properties in step-barrier structures are revealed. It is shown that the global behavior of step-barrier structures obtained resembles that of asymmetric double-barrier structures, and step-barrier structures are superior to both single- and double-barrier structures in many aspects. In comparison to asymmetric double-barrier structures, step-barrier structures have several features, such as a wider negative-differential resistance region, easier fabrication, high-speed response, and a relatively lower transmission coefficient and current peak-to-valley ratios. Moreover, higher resonant bias is required in order to obtain optimal transmission resonances in the step-barrier structure. The results shown in this work not only shed new light on the physics of resonant tunneling in electric-barrier structures but are also helpful in designing quantum devices based on step-barrier tunneling structures. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368156
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  • 7
    Electronic Resource
    Electronic Resource
    A Stationary Phase for Open Tubular Liquid Chromatography and Electrochromatography Using Sol-Gel Technology (1995)
    s.l. : American Chemical Society
    Analytical chemistry 67 (1995), S. 2511-2516 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00111a003
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  • 8
    Electronic Resource
    Electronic Resource
    Aberrant cannabinoid signaling impairs oviductal transport of embryos (2004)
    [s.l.] : Nature Publishing Group
    Nature medicine 10 (2004), S. 1074-1080 
    Details
    ISSN: 1546-170X
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Ectopic pregnancy is a major reproductive health issue. Although other underlying causes remain largely unknown, one cause of ectopic pregnancy is embryo retention in the fallopian tube. Here we show that genetic or pharmacologic silencing of cannabinoid receptor CB1 causes retention of a large ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nm1104
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  • 9
    Electronic Resource
    Electronic Resource
    A chemokine receptor CCR2 allele delays HIV-1 disease progression and is associated with a CCR5 promoter mutation (1998)
    [s.l.] : Nature Publishing Group
    Nature medicine 4 (1998), S. 350-353 
    Details
    ISSN: 1546-170X
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Viral and host factors influence the rate of HIV-1 disease progression1. For HIV-1 to fuse, a CD4+ cell must express a co-receptor that the virus can use2,3. The chemokine receptors CCR5 and CXCR4 are used by R5 and X4 viruses, respectively4. Most new infections involve transmission of R5 viruses, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nm0398-350
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  • 10
    Electronic Resource
    Electronic Resource
    Experimental Studies on Axially Loaded Concrete Columns Confined by Different Materials (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 400-402 (Oct. 2008), p. 513-518 
    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 improvement of the load carrying capacity of concrete columns under a triaxial compressive stress results from the strain restriction. Under a triaxial stress state, the capacity of the deformation of concrete is greatly decreased with the increase of the side compression. Therefore, confining the deformation in the lateral orientation is an effective way to improve the strength and ductility of concrete columns. This paper carried out an experimental investigation on axially loaded normal strength concrete columns confined by 10 different types of materials, including steel tube, glass fiber confined steel tube (GFRP), PVC tube, carbon fiber confined PVC tube (CFRP), glass fiber confined PVC tube (GFRP), CFRP, GFRP, polyethylene (PE), PE hybrid CFRP and PE hybrid GFRP. The deformation, macroscopical deformation characters, failure mechanism and failure modes are studied in this paper. The ultimate bearing capacity of these 10 types of confined concrete columns and the influences of the confining materials on the ultimate bearing capacity are obtained. The advantages and disadvantages of these 10 types of confining methods are compared
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/58/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.400-402.513.pdf
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