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  • Articles  (67)
  • 1995-1999  (57)
  • 1980-1984  (10)
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  • 11
    Electronic Resource
    Electronic Resource
    Crossed anisotropies in FeB/CoSiB bilayers induced by the bowed-substrate sputtering technique (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 105-107 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: FeB/CoSiB bilayers were deposited onto bowed glass substrates using the radio frequency sputtering technique. On removing the bilayers from the sputtering chamber, a magnetoelastic anisotropy was induced due to the compressive stress developed when the substrates recovered their initial planar shape. The bulk magnetic behavior was investigated using magnetometry techniques over a wide temperature range (5–350 K). The surface magnetism was analyzed using room-temperature Kerr magnetometry. Due to the positive/negative magnetostrictive nature of each of the layers deposited, the induced anisotropies are found to be crossed. Evidence of crossed anisotropies is obtained from the surface hysteresis loops as well as from the low-temperature thermomagnetic behavior. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122965
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  • 12
    Electronic Resource
    Electronic Resource
    Extraordinary anisotropic magnetoresistance effect under 35 Oe field at room temperature in Co/Ni multilayers (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 718-720 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Extraordinary magnetoresistance effect has been found in Ni/Co sputtered multilayers. Magnetoresistance values higher than 130% are achieved at room temperature with a saturation magnetic field of 35 Oe, using a particular arrangement of contacts. The large anisotropic magnetoresistance and the low coercivity of these samples are the origin of such an outstanding property. The results reported here seem to have promising applications in magnetoresistive devices. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115285
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  • 13
    Electronic Resource
    Electronic Resource
    Influence of the interfaces on the anisotropic magnetoresistance of Ni/Co multilayers (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 2596-2598 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Anisotropic magnetoresistance in Ni is found to increase abruptly when Co impurity layers are inserted. Some experiments carried out in different Ni/Co multilayers indicate that interfaces are responsible for the magnetoresistance enhancement. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117711
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  • 14
    Electronic Resource
    Electronic Resource
    Dislocation dynamics in confined geometry (1999)
    Springer
    Journal of computer-aided materials design 6 (1999), S. 157-164 
    Details
    ISSN: 1573-4900
    Keywords: Dislocation dynamics ; Frank-Read source ; Plasticity ; Simulation ; Thin film
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A simulation of dislocation dynamics has been used to calculate the critical stress for a threading dislocation moving in a confined geometry. The optimum conditions for conducting simulations in systems of various sizes, down to the nanometer range, are defined. The results are critically compared with the available theoretical and numerical estimates for the problem of dislocation motion in capped layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008730711221
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  • 15
    Electronic Resource
    Electronic Resource
    Experimental study of pollination by ants in Mediterranean high mountain and arid habitats (1996)
    Springer
    Oecologia 105 (1996), S. 236-242 
    Details
    ISSN: 1432-1939
    Keywords: Ant pollination ; High-mountain ecology ; Mediterranean habitats ; Mutualism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In this paper, we report the results of an experimental study on ant pollination of three plant species inhabiting the Mediterranean high mountains (Alyssum purpureum, Arenaria tetraquetra and Sedum anglicum) and four species inhabiting the aridlands (Lepidium subulatum, Gypsophyla struthium, Frankenia thymifolia and Retama sphaerocarpa) of South-eastern Spain. We determined several plant and ant traits, as well as the composition and abundance of the pollinator assemblage. Insects belonging to 29 families and five orders visited the flowers of the plant species studied. In all but two, L. subulatum and G. struthium, the ants comprised 70–100% of the flower visitors. The results clearly show that five out of seven of these plant species were pollinated by ants. The role of the ants as pollinators seems to depend heavily on the relative abundance of the ants with respect to the other species of the pollinator assemblage, ant pollination becoming evident when ants outnumber other floral visitors. The ant-pollination systems analysed in this study may be the result of prevailing ecological conditions more than an evolutionary result of a specialized interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00328552
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  • 16
    Electronic Resource
    Electronic Resource
    All free of complex expansion null orbits type-D electrovac solutions with λ (1983)
    Springer
    General relativity and gravitation 15 (1983), S. 417-423 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The free of complex expansion type-D solutions of Einstein-Maxwell equations with cosmological constant possessing a noninvertible group of local isometries with null orbits for the alignment of the general electromagnetic field along the doubleD-P directions are presented. These solutions are endowed with five continuous parameters, and are found to be a special case of the Carter non-null orbits metricB(−).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00759935
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  • 17
    Electronic Resource
    Electronic Resource
    Type-D vacuum solutions with cosmological constant (1984)
    Springer
    General relativity and gravitation 16 (1984), S. 417-422 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract All type-D vacuum (nonnull orbit and null orbit) solutions with λ are exhibited in canonical coordinates. The nonnull orbit metrics with λ contain four families of solutions: the static Levi-Cività metrics, the nondivergingD's, the divergingD's, and the diverging and twisting solutions. The null orbit metrics subdivide into two subclasses of solutions: the divergenceless null orbitD's, and the diverging and twisting null orbit solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00762333
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  • 18
    Electronic Resource
    Electronic Resource
    Kinetics of electron transfer between the tetrahemic cytochrome and the special pair in isolated reaction centers of Roseobacter denitrificans (1998)
    Springer
    Photosynthesis research 55 (1998), S. 331-335 
    Details
    ISSN: 1573-5079
    Keywords: electron transfer ; photosynthetic reaction center ; Roseobacter denitrificans ; tetrahemic cytochrome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have analyzed the rate of electron transfer between the tetrahemic cytochrome and the primary electron donor in isolated reaction centers of Roseobacter denitrificans as a function of the ambient redox potential. Three different phases are observed: a slow phase (half-time 〉 ms), and two fast phases with half-times of 5 µs and 380 ns. The slow phase is present at high redox potential, it corresponds to the kinetics of charge recombination between the photo-oxidized primary electron acceptor P+ and the reduced primary acceptor (Q A − ). The 5 µs phase titrates with the reduction of the highest potential heme (HP1). This phase corresponds to the electron transfer between heme HP1 and P+. At redox potentials where the second high potential heme HP2 becomes reduced, the 5 µs phase disappears and is replaced by the 380 ns phase, which is therefore related to the electron transfer between the high potential heme HP2 and P+. To explain the large difference in the rate of oxidation of HP1 and HP2 we propose a tentative model where the heme HP2 is closest to P.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005941031263
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  • 19
    Electronic Resource
    Electronic Resource
    Optimization of conditions to prepare PLZT thin films from oxide precursors (1999)
    Springer
    Journal of materials science 18 (1999), S. 1961-1962 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006610021339
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  • 20
    Electronic Resource
    Electronic Resource
    Fast firing of reaction-bonded aluminium oxide RBAO composites (1995)
    Springer
    Journal of materials science 30 (1995), S. 5121-5124 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Al2O3/ZrO2 composites have been prepared by fast firing of oxidized Al/Al2O3/ZrO2 precursors produced by the reaction-bonded aluminium oxide (RBAO) technique. This fabrication route results in high-strength ceramics at relatively low densities. For example, after fast firing for 20 min at 1550 °C, RBAO containing 20 vol% ZrO2 shows four-point bending strengths of 〉 600 MPa at a density of ∼95% theoretical which is comparable to conventionally sintered RBAO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00356058
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