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Claude Carel - One of the best experts on this subject based on the ideXlab platform.

  • The complex nonstoichiometry of wüstite Fe 1-z O: review and comments
    Progress in Solid State Chemistry, 2019
    Co-Authors: Jean-raymond Gavarri, Claude Carel
    Abstract:

    Thermodynamic properties and structural aspects of the nonstoichiometric wüstite Fe1-zO, and its modifications - the so-called pseudo-phases - as functions of departure z from stoichiometry and of equilibrium temperature are reviewed from 1960 to present. The complexity of the equilibrium phase diagram is described in some details. The first order transition W ⇆ W’ is specified on the iron/wüstite boundary near 1185 K. Transitions correlated to the modifications Wi at T(W) > 1185 K and W’j at T(W’) < 1185 K (i and j =1,2,3) are re-examined. Structural determinations based on the characterization of point defects stabilization and of their clustering are reviewed. Additionally, the pseudo-phases are examined based on the transformation of defect clusters or of their Mode of Distribution (i.e., percolation or superstructure) with the inclusion of changes in electronic charge carriers.

  • A review about wüstite Fe 1-z O, pseudo-phases and defect clustering
    2017
    Co-Authors: Jean-raymond Gavarri, Claude Carel
    Abstract:

    Thermodynamic properties and structural aspects of the non-stoichiometric wüstite Fe 1-z O, and its modifications-the so-called pseudo-phases-as functions of composition z and equilibrium temperature are reviewed from 1960 to present (159 references). The focus is first put on the complexity of the equilibrium phase diagram. The first order transition W <==> W' is specified on the boundary iron/ wüstite close to 1185 K. Transitions correlated to the modifications Wi at T(W) > 1185 K and W'j at 1185K < T(W') < T(W) (i and j =1,2,3) are reexamined. Structural determinations based on point defects and their clustering are recalled. A series of equilibria are developed, trying to justify the stabilization of the pseudo-phases, which can be interpreted in terms of transformation of defect clusters, or their Mode of Distribution (percolation, superstructure) including changes in electronic charge carriers.

Jean-raymond Gavarri - One of the best experts on this subject based on the ideXlab platform.

  • The complex nonstoichiometry of wüstite Fe 1-z O: review and comments
    Progress in Solid State Chemistry, 2019
    Co-Authors: Jean-raymond Gavarri, Claude Carel
    Abstract:

    Thermodynamic properties and structural aspects of the nonstoichiometric wüstite Fe1-zO, and its modifications - the so-called pseudo-phases - as functions of departure z from stoichiometry and of equilibrium temperature are reviewed from 1960 to present. The complexity of the equilibrium phase diagram is described in some details. The first order transition W ⇆ W’ is specified on the iron/wüstite boundary near 1185 K. Transitions correlated to the modifications Wi at T(W) > 1185 K and W’j at T(W’) < 1185 K (i and j =1,2,3) are re-examined. Structural determinations based on the characterization of point defects stabilization and of their clustering are reviewed. Additionally, the pseudo-phases are examined based on the transformation of defect clusters or of their Mode of Distribution (i.e., percolation or superstructure) with the inclusion of changes in electronic charge carriers.

  • A review about wüstite Fe 1-z O, pseudo-phases and defect clustering
    2017
    Co-Authors: Jean-raymond Gavarri, Claude Carel
    Abstract:

    Thermodynamic properties and structural aspects of the non-stoichiometric wüstite Fe 1-z O, and its modifications-the so-called pseudo-phases-as functions of composition z and equilibrium temperature are reviewed from 1960 to present (159 references). The focus is first put on the complexity of the equilibrium phase diagram. The first order transition W <==> W' is specified on the boundary iron/ wüstite close to 1185 K. Transitions correlated to the modifications Wi at T(W) > 1185 K and W'j at 1185K < T(W') < T(W) (i and j =1,2,3) are reexamined. Structural determinations based on point defects and their clustering are recalled. A series of equilibria are developed, trying to justify the stabilization of the pseudo-phases, which can be interpreted in terms of transformation of defect clusters, or their Mode of Distribution (percolation, superstructure) including changes in electronic charge carriers.

D.j. Hirst - One of the best experts on this subject based on the ideXlab platform.

  • Depth Distribution of cherry (Prunus avium L.) tree roots as influenced by grass root competition
    Plant and Soil, 2001
    Co-Authors: L.a. Dawson, E.i. Duff, C.d. Campbell, D.j. Hirst
    Abstract:

    We investigated the effect of competition from grass roots (as controlled by herbicide application) on the depth Distribution of white roots in cherry trees, grown with varying rates and frequency of application of N in an agroforestry system. Statistical summaries of Distribution, namely mean and skewness, produced a concise and interpretable analysis of the data. There was a large increase in tree root numbers in the surface horizons after the herbicide had reduced grass root competition. Where the surrounding grass had not been reduced by herbicide, the average depth of tree roots increased with time, contrasting with a marked shift in the Mode of Distribution of root numbers to shallow depths when grass competition was removed. These findings are important in the understanding of plant root competition and for prescribing best practise for tree establishment in agroforestry systems.

L.a. Dawson - One of the best experts on this subject based on the ideXlab platform.

  • Depth Distribution of cherry (Prunus avium L.) tree roots as influenced by grass root competition
    Plant and Soil, 2001
    Co-Authors: L.a. Dawson, E.i. Duff, C.d. Campbell, D.j. Hirst
    Abstract:

    We investigated the effect of competition from grass roots (as controlled by herbicide application) on the depth Distribution of white roots in cherry trees, grown with varying rates and frequency of application of N in an agroforestry system. Statistical summaries of Distribution, namely mean and skewness, produced a concise and interpretable analysis of the data. There was a large increase in tree root numbers in the surface horizons after the herbicide had reduced grass root competition. Where the surrounding grass had not been reduced by herbicide, the average depth of tree roots increased with time, contrasting with a marked shift in the Mode of Distribution of root numbers to shallow depths when grass competition was removed. These findings are important in the understanding of plant root competition and for prescribing best practise for tree establishment in agroforestry systems.

Zhang Hailong - One of the best experts on this subject based on the ideXlab platform.

  • Research of New Feeder Automation System Based on GPRS
    Low Voltage Apparatus, 2009
    Co-Authors: Zhang Hailong
    Abstract:

    Realization of feeder automation based on GPRS network was introduced.The hardware realization of intelligent FTU device and its anti-interference measures were expounded.The protection scheme of whole feeder automation system was designed.This system was equipped with powerful background monitoring software which can real-time monitor the working condition of whole feeder circuit.Its successful application improved the automation level and optimized the running Mode of Distribution power grid,easy to access the operation for staff.