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  • 1
    Electronic Resource
    Electronic Resource
    Anneal-tunable Curie temperature and transport of La0.67Ca0.33MnO3 (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 5158-5161 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Resistivity measurements on a La0.67Ca0.33MnO3 film are reported for a series of argon anneals at successively higher temperatures. Tc, the ferromagnetic ordering temperature, increases uniformly with increasing annealing temperature and annealing time. Hence, Tc can be tuned by appropriate annealing. In order to fully anneal these samples, i.e., achieve bulk properties, it proves sufficient to anneal them in argon. Further annealing in oxygen produces only minor changes in the resistivity. Data from Tc up to 1200 K show activated conduction with ρ=BTeEa/kT, the temperature dependence predicted by the Emin–Holstein theory of adiabatic polaron hopping. Their model fits both data from the partially annealed and fully annealed samples better than the variable range hopping or semiconductor models which have been used by previous workers. The activation energy Ea and resistivity coefficient B decrease with increasing maximum anneal temperature. These changes, together with the increase in Tc, are consistent with an anneal induced relaxation of the Mn–O–Mn bond angle. The time dependent resistivity during annealing at a fixed temperature follows the equation ρ=ρ0{1−D ln[1+(t−t0)/τ]}, making it possible to acquire data in a reversible regime, and also to obtain an estimate of the annealing activation energy. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363498
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  • 2
    Electronic Resource
    Electronic Resource
    Growth and small polaron properties of epitaxial La1−xCaxMnO3 thin films (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 5913-5916 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the epitaxial growth and properties of La1−xCaxMnO3 thin films deposited by pulsed laser ablation. We grew and characterized 11 thin films covering the entire doping range, from x=0 to x=1. A presence of oxygen during postdeposition annealing is shown to be required in order to reduce the resistivity of the samples and to obtain reproducible samples. The lattice constant and phonon frequency that appear in the Emin–Holstein, [D. Emin and T. Holstein, Ann. Phys. 53, 439 (1969).] adiabatic small polaron conductivity formula are reported. Resistivity data from 20 to 300 K are also reported. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367454
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetoresistive double spin filter tunnel junction (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 5277-5279 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We propose a magnetoresistive tunnel device that takes advantage of the spin filter effect. Two magnetic tunnel barriers are contacted by normal metal electrodes. The resistance of the device is lower (higher) when the magnetic moments of the two barriers are parallel (antiparallel). We present a theoretical calculation of the magnetoresistance. This device has the potential to work above room temperature, in very small fields, and to give a sensitivity orders of magnitude larger than what is possible with standard magnetic tunnel junctions. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1315619
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  • 4
    Electronic Resource
    Electronic Resource
    Spin-polarized tunneling in La0.67Sr0.33MnO3 (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 900-902 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have developed the ability to grow reproducible La0.67Sr0.33MnO3/SrTiO3/Al tunnel junctions with high quality gap characteristics for spin-polarization measurements. A YBa2Cu3O7 counterelectrode was required to prevent current crowding. In order to fit our data, we have numerically solved Maki's equations which include the effects of orbital depairing, the Zeeman splitting of the spin states, and spin-orbit scattering. We consistently measure P=+72%, for a variety of deposition conditions. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125623
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  • 5
    Electronic Resource
    Electronic Resource
    Role of Human Performance in Energy Systems Management (1992)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Environment and Resources 17 (1992), S. 285-300 
    Details
    ISSN: 1056-3466
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.eg.17.110192.001441
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  • 6
    Electronic Resource
    Electronic Resource
    Control of transpiration in an irrigated Eucalyptus globulus Labill. plantation (2000)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 23 (2000), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Stomatal conductance and transpiration were measured concurrently in an irrigated Eucalyptus globulus Labill. plantation. Canopy stomatal conductance, canopy boundary layer conductance and the dimensionless decoupling coefficient (Ω) were calculated (a) summing the conductance of three canopy layers (gc) and (b) weighting the contribution of foliage according to the amount of radiation received (gc′). Canopy transpiration was then calculated from gc and gc′ for Ω = 1 (Eeq), Ω = 0 (Eimp) and by weighting Eeq and Eimp using Ω (EΩ). Eeq, Eimp and EΩ were compared to transpiration estimated from measurements of heat pulse velocity. The mean value of Ω was 0·63. Transpiration calculated using gc and assuming perfect coupling (12·5 ± 0·9 mmol m−2 s−1) significantly overestimated measured values (8·7 ± 0·8 mmol m−2 s−1). Good estimates of canopy transpiration were obtained either (a) calculating EΩ separately for the individual canopy layers or (b) treating the canopy as a single layer and using gc′ in a calculation of Eimp (Ω = 0). The latter approach only required measurement of stomatal conductance at a single canopy position but would be unsuitable for use in combined models of canopy transpiration and assimilation. It should however, be suitable for estimating transpiration in forests regardless of the degree of coupling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3040.2000.00530.x
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  • 7
    Electronic Resource
    Electronic Resource
    The effect of the annealing temperature on the local distortion of La0.67Ca0.33MnO3 thin films (1999)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 6 (1999), S. 682-684 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049599000953
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  • 8
    Electronic Resource
    Electronic Resource
    Daily stem growth patterns in irrigated Eucalyptus globulus and E. nitens in relation to climate (1999)
    Springer
    Trees 14 (1999), S. 102-111 
    Details
    ISSN: 0931-1890
    Keywords: Key words Stem growth ; Eucalyptus globulus ; Eucalyptus nitens ; Dendrometer ; Growth rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Daily increments in stem radius were determined from hourly dendrometer measurements in each of three irrigated Eucalyptus nitens and E. globulus trees. Multiple regressions determined from daily weather variables accounted for 40–50% of the variance in increment. The use of weather variables lagged by 1–2 days increased the variance explained. The diurnal variation in stem radius was resolved into three mathematically defined phases: shrinkage, recovery and increment. The positive daily net increment in stem radius, by definition, occurred in the increment phase. Average weather conditions during this phase (predominantly night-time) did not explain any more variance in increment than the average daily conditions, determined over a 24 h period. Daily increment was resolved into a rate of stem radius increase during the increment phase and the duration (hours) of that phase. Significant species by month interactions were evident with growth in summer characterised by faster rates of stem expansion over shorter time periods within each diurnal cycle. E. nitens tended to have longer increment phases in spring and autumn, and faster phase rates in autumn than E. globulus. Interactions between weather variables and cambial growth were complicated and varied over the year. The correlation between temperature and stem growth varied from positive in spring to zero or negative during summer. The data indicate a need to understand weather-by- climate interactions at the level of whole tree physiology in order to fully understand the effect of weather on cambial activity and therefore stem increment and wood properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00009752
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  • 9
    Electronic Resource
    Electronic Resource
    The effect ofMetarhizium anisopliae (DAT F-001) concentration and exposure time on the survival of the subterranean pasture pest,Adoryphorus couloni (Col.: Scarabaeidae) (1995)
    Springer
    BioControl 40 (1995), S. 35-45 
    Details
    ISSN: 1573-8248
    Keywords: pathogenicity ; virulence ; infection ; biocontrol ; larval feeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé La virulence deM. anisopliae DAT F-001 pourA. couloni a été analysée en exposant des larves L3 à des concentrations de 101 à 107 spores/g dans un mélange de sable et de tourbe pendant un maximum de 112 jours à une température de 20°±2°C. Toutes les concentrations sont pathogènes pour les larves L3; la survie dépendait de la concentration et est en corrélation avec le temps d'exposition. Les LT50 sont compris entre 18,9 jours (107 spores/g) et 82,7 jours (101 spores/g). L'effet de DAT F-001 sur l'alimentation des larves L3 a été évalué en comparant la production et le poids des fèces/larve/jour des larves non-traitées avec des larves roulées dans des cultures sporulées deM. anisopliae DAT F-001 et DAT F-054 (faible virulence). L'exposition àM. anisopliae DAT F-001 suivie de l'infection a peu d'effet sur l'alimentation des larves. Les larves L3 continuent à s'alimenter au même rythme que les larves non-traitées de DAT F-054, quasiment jusqu'à leur mort.
    Notes: Abstract The virulence of the DAT F-001 isolate ofMetarhizium anisopliae forAdoryphorus couloni was tested by exposing final instar larvae (L3) to concentrations of 101 to 107 spores/g in a sand-peat mix for up to 112 days at 20°±2°C. All concentrations were pathogenic to L3 larvae and survival was dependent on concentration and correlated with exposure time. The time to kill 50% of the treated larvae (LT50) ranged from 18.9 days (107 spores/g) to 82.7 days (101 spores/g). The effect of DAT F-001 on feeding by L3 larvae was determined by comparing the production and weight of frass pellets/larva/day of untreated control larvae with larvae rolled in sporulating cultures ofM. anisopliae DAT F-001 and DAT F-054 (low virulence). Exposure to, and infection byM. anisopliae DAT F-001 had minimal impact on larval feeding. L3 larvae continued to feed at the same rate as both untreated and DAT F-054 treated larvae virtually until they died.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02372679
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  • 10
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    Resonant Activation of a Synthetic Antiferromagnet (2011)
    American Physical Society
    Details
    Publication Date: 2011-08-09
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society
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