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  • 1
    Electronic Resource
    Electronic Resource
    Out-of-plane magnetoresistivity for fields parallel to the c axis in single-crystalline (La1−xSrx)2 CuO4 (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 1706-1710 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The c-axis magnetoresistivity as a function of temperature T and field H for fields parallel to the c axis is experimentally investigated for single-crystalline (La1−xSrx)2CuO4 (x=0.068). It is argued that the observed Lorentz force free magnetoresistive phenomena cannot be accounted for by previously considered mechanisms. By contrast, they can be explained by the extended Josephson coupling model, which takes into account both effective thermal energy and anisotropy. Based on this extended model, it is shown that all the magnetoresistivity curves obtained in H//I//c at various constant temperatures could be nicely scaled onto a single curve without any adjustable parameter in a wide transition region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357685
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetoresistivity below Tc in silver-clad Bi1.8Pb0.4Sr2Ca2Cu3Oy tape (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 2613-2617 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured the magnetoresistance curves of a silver-clad Bi (2223) tape below critical temperature Tc over a magnetic field range up to 8 T. At temperatures well below Tc the magnetoresistive transition can be well described by a thermally activated flux flow (TAFF) process. The activation energies inferred from such dissipation measurements are found to have the form U=U0+U' (H,T), where U0 is magnetic field and temperature independent, U' (H,T) is proportional to (1−T/Tc)n/H. At temperatures very close to Tc the TAFF dissipation can no longer be found and the magnetoresistance seems to be determined by the combination of viscous flux flow and thermal fluctuation. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358725
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic-field-induced strains and magnetic properties of Heusler alloy Ni52Mn23Ga25 (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6292-6294 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Large magnetic-field-induced strain (MFIS) of −2700 ppm has been obtained from the Heusler alloy Ni52Mn23Ga25 at 300 K. The temperature for structure transformation was confirmed by three types of magnetic measurements. A burst of MFIS up to 5400 ppm could be induced by rotating a steady field of 1 T. In the martensitic phase, the material have a high saturated magnetization of 66 Am2/kg and a high anisotropy of 0.8 T. The variant reorientation mainly occurred in the region of 0.2–0.8 T. The large MFIS is sensitive to temperature, suggesting that it can only be induced when martensite and parent phase are coexisted. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372683
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  • 4
    Electronic Resource
    Electronic Resource
    Giant magnetic-field-induced strains in Heusler alloy NiMnGa with modified composition (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2990-2992 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A giant magnetic-field-induced strain (MFIS) of −3100 ppm has been obtained in Heusler alloy Ni52Mn22.2Ga25.8 single crystal in the [001] direction at a temperature from 23 to 31 °C. This MFIS reaches saturation in an applied field about 6 kOe, and exhibits the same amplitude with an opposite sign while the field is perpendicular to the samples. According to a previous model, this MFIS associates with the twin boundary motion. The martensitic self-strain has been found to be 2%, implying a preferential orientation of martensite variants. Results related to the magnetic properties are discussed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125211
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  • 5
    Electronic Resource
    Electronic Resource
    Resistive transition of Bi(2223) silver clamped thick film (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 5108-5111 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Detailed measurements of voltage-current (V-I) curves and magnetoresistance (R-H) for Bi(2223) thick film were carried out for various temperatures and magnetic fields. The results indicate that a flux lattice melting transition takes place as the temperature and the field are raised. This transition boundary in the (H,T) phase diagram was found to follow the irreversibility line described by the function of H=H0(1−T/Tc)3/2. Above this line, the V-I curves display a flux-flow-like character. Temperature and magnetic field dependencies of flow resistance Rf-T and Rf-H show a varied viscosity in different temperature and field ranges. Below this line, V-I curves in the low voltage region present a thermally activated flux creep property. The R-H measurements indicate that the fields at the onset and the midpoint of the magnetoresistive transition also follow a (1−T/Tc)3/2 dependence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354297
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic properties and shape memory of Fe-doped Ni52Mn24Ga24 single crystals (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 634-636 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single crystals of a pseudoquaternary Heusler alloy, Ni52Mn16Fe8Ga24, have now been synthesized. The substitution of Fe for Mn strengthens the magnetic exchange interactions, increasing the Curie temperature to 381 K. The Fe also increases the Ni magnetic moment to 0.41 μB relative to that in the stoichiometric Heusler composition. The strain accompanying the martensitic transformation is 2.4% in zero field and can be enhanced to 4.2% by a field of 1.2 T. A field-induced strain of 1.15% has been induced along [001] in unstressed crystals with magnetic fields of 1.2 T applied at 291 K. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1447003
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  • 7
    Electronic Resource
    Electronic Resource
    Stress-free two-way thermoelastic shape memory and field-enhanced strain in Ni52Mn24Ga24 single crystals (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 3245-3247 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Stress-free and two-way thermoelastic shape memory, with 1.2% strain and 6 K temperature hysteresis, has been found in single crystalline Ni52Mn24Ga24. The deformation can be enhanced more than three times, up to 4.0% shrinkage with a bias field 1.2 T applied along the measurement direction, or changed to 1.5% expansion by the 1.2 T applied perpendicular to the measurement direction. For achieving a large deformation, the magnetic field exhibits a more evident contribution than an external stress on this material. These characteristics can be attributed to the low level of internal stress and the preferential orientation of the martensitic variants. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1325388
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  • 8
    Electronic Resource
    Electronic Resource
    Intermartensitic transformation and magnetic-field-induced strain in Ni52Mn24.5Ga23.5 single crystals (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 1148-1150 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have found a complete thermoelastic intermartensitic transformation between modulated and unmodulated martensite in single-crystal Ni52Mn24.5Ga23.5. This intermartensitic transformation provides a much larger strain than that of the martensitic transformation. A giant switching-like strain of ±5.0% can be achieved by a small magnetic field of 0.2 T upon the intermartensitic transformation. In the modulated martensite, a large recoverable magnetic-field-induced strain of up to 1.2% has been obtained. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1396820
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  • 9
    Electronic Resource
    Electronic Resource
    Production of Spontaneous Diploid Lines from Isolated Microspores Following Cryopreservation in Spring Rapeseed (Brassica napus L.) (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 108 (1992), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Cryopreservation of microspores provides a potentially powerful means for increasing percentage of spontaneous diploids in microspore-derived populations in rapeseed (Brassica napus L.). This study was to investigate the production of spontaneous diploid lines in relation to steps of cryopreserving micro-spores of two spring rapeseed breeding lines G-231 and M3-124. Microspores of both genotypes were isolated and subjected to Cryopreservation. The step of cooling process (before liquid nitrogen immersion) in a Cryopreservation protocol resulted in high percentages of spontaneous diploids in lines regenerated from frozen microspores in both genotypes. Liquid nitrogen immersion and subsequent thawing process had no influence on the percentage of spontaneous diploids. A linear relationship between percentage of spontaneous diploids and cooling temperatures was detected. The lowest cooling temperature of −40 °C yielded the highest percentages of spontaneous diploids (51.1 % in G-231 and 47.7 % in M3-124, respectively), which were more than doubled in comparison to those in the corresponding unfrozen controls. The current study indicated that cold treatment may be utilized to greatly enhance the percentage of spontaneous diploids in rapeseed breeding programs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1992.tb00138.x
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  • 10
    Electronic Resource
    Electronic Resource
    Optimal cutting frequency and intervals derived from Johnson and Thornley's model of grass growth
    Amsterdam : Elsevier
    Agricultural Systems 22 (1986), S. 305-314 
    Details
    ISSN: 0308-521X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0308-521X(86)90097-1
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