Characterization of six-coordinated iron (V) in an oxide lattice

On the basis of a discussion of the correlations between the stability of the d³ configuration and the symmetry and size of the cation site, six-coordinated iron (V) has been stabilized in the La₂LiFeO₆ perovskite-type oxide and characterized by magnetic susceptibility, Mössbauer resonance and EPR measurements.     

Ionic conductivity of amorphous mNaFnMF3 thin films (M=Al,Cr)

Evaporated 0.5 to 0.7 μm thick thin films of mNaFnAlF₃ or mNafnCrF₃ were prepared in a 1 mPa vacuum on glass substrates kept at room temperature. Chemical analysis and AC conductivity measurement revealed that in each case studied, a high ionic conductivity plateau existed for the composition range $\text{0.1 <}\text{n}\text{(m+n)}\text{< 0.4}$. The maximum conductivities at room temperature were σ = 1 × 10^?6 S/mm for NaFAlF₃ and σ = 2 × 10^?5 S/m for NaFCrF₃. Those high conductivities were discussed in terms of arrangement of MF₆ octahedra.     

A hybrid data assimilation scheme for model parameter estimation: Application to morphodynamic modelling

We present a novel algorithm for joint state-parameter estimation using sequential three dimensional variational data assimilation (3D Var) and demonstrate its application in the context of morphodynamic modelling using an idealised two parameter 1D sediment transport model. The new scheme combines a static representation of the state background error covariances with a flow dependent approximation of the state-parameter cross-covariances. For the case presented here, this involves calculating a local finite difference approximation of the gradient of the model with respect to the parameters. The new method is easy to implement and computationally inexpensive to run. Experimental results are positive with the scheme able to recover the model parameters to a high level of accuracy. We expect that there is potential for successful application of this new methodology to larger, more realistic models with more complex parameterisations.     

An ultrastructural study of the phagocytosis of Burkholderia pseudomallei

Burkholderia pseudomallei causes melioidosis and is believed to be an intracellular pathogen in human and animal disease. The uptake of B. pseudomallei by mouse peritoneal macrophages and cells in tissue culture was examined by electron microscopy. In all the systems studied B. pseudomallei were phagocytosed and apparently inhibited the normal processes of intracellular killing. Destruction of the phagosome membrane occurred and the bacteria escaped into the cytoplasm.     

Aptitude-treatment interaction research in the clinical setting: A review of attempts to dispel the "patient uniformity" myth.

Aptitude-treatment interaction (ATI) research is directed toward identifying client variables that predict differential treatment responsiveness. As such, insights derived from this research are of potential importance for clinicians faced with the dilemma of selecting the most effective treatment for their clients. Unfortunately, most of the ATI research to date has been characterized by the use of an inappropriate methodology. Therefore, some general methodological issues with regard to ATI research are outlined. The literature encompassing cognitive and/or behavioral treatments for anxiety, depression, pain, obesity, and tobacco dependence is then reviewed. This examination reveals little consistency in the emergence of individual differences relevant to treatment responsiveness. There are some indications that it may be possible to distinguish two (broadly defined) groups of individuals: those with active and those with less active coping styles. The former group appears to fare better in treatments that emphasize self-control rather than therapist control. In addition, the distinction between visually and verbally based coping strategies has been shown in some cases to predict response to visually or verbally based therapies. Overall, however, attempts to identify treatment-relevant client attributes have been disappointing, and suggestions for improving ATI research are forwarded. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A Computer Simulation Study for the Digital Processing of Longitudinal Tomograms Obtained with a Zone Plate Camera

Longitudinal tomoplanes characterizing a three-dimensional object distribution suffer from the problem of interference between planes and their information content can be misleading for diagnostic purposes. Techniques for unscrambling linked tomograms are examined and it is demonstrated that matrix inversion generates artifact free tomographic information. This method is perfectly general and has been applied to zone plate coded aperture imaging. For this system the quantum noise limitation has been examined and is relatively independent of the spatial frequency content of the object. Provided sufficient information can be collected, processed reconstructions faithfully represent both high frequency and uniform object distributions.     

Evolution structurale par substitution cationique dans les perovskites hexagonales fluorees: II - Les systèmes Cs1−xRbxMF3 (M = Mg,Co, Ni,Zn)

The substitution of rubidium for cesium in CsMF₃ phases has the same influence as pressure. While no phase transformation is observed if M is magnesium or zinc, the sequences 2H → 9R → 6H and 9R → 6H → 3C are respectively observed in the case of nickel and cobalt with increasing rubidium concentration. The 9R-Cs_0.70 Rb_0.30 NiF₃ phase is antiferromagnetic and the 6H-Cs_0.50 Rb_0.50 CoF₃ compound is a ferrimagnet (T_C = 62 K).     

Communication and Ecumenism

Ecumenism is dependent upon communication for initiation and for continuance. Yet both concepts, “ecumenism,” and “communication,” seem so mystical as to be a special case of the blind leading the blind. The relationship between ecumenism and communication as reflected in selected recent writings dealing with their reciprocal impact is herein examined.     

Un exemple de chaînes antiferromagnetiques alternees de spin 12: CuWO4

The ordering of Cu and W atoms in the distorted wolframite structure of CuWO₄ gives rise to zigzag chains of edge sharing CuO₆ octahedra linked by similar chains of WO₆ octahedra. The existence of two kinds of connections between the CuO₆ octahedra leads to alternating antiferromagnetic interactions along the chains. The magnetic behavior is explained using a Heisenberg type model of Duffy and Barr with the largest exchange integral : J = ? 67 K and an alternation parameter : a = 0.8. k_B EPR measurements have shown that threedimensional ordering occurs at $\text{T}{}_{\mathrm{N}}\text{? 24}\text{K}$.