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The influence of the solvents in the extraction of strong mineral acids with high-molecular amines has been investigated. The use of empirical parameters was shown to allow the determination of the solvent influence. Linear dependencies between the logarithms of the extraction constants and the parameters of IS (ELm) were obtained. A new scale of empirical parameters is proposed. 相似文献
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D.A. Genov K. Seal A.K. Sarychev H. Noh V.M. Shalaev Z.C. Ying X. Zhang H. Cao 《Applied physics. B, Lasers and optics》2006,84(1-2):205-210
Theoretical and experimental studies of the electromagnetic response of semicontinuous metal films are presented. A scaling
theory is developed by solving the surface plasmon eigenproblem. The short-range correlations in the governing Kirchhoff Hamiltonian
result in delocalization of the surface plasmon eigenmodes. Although their relative weight in the spectrum becomes asymptotically
small for large systems, the existence of these delocalized states modifies the critical indices for the high-order field
moments. This modification is confirmed experimentally by the near-field measurement of high-order intensity moments for percolating
silver films on glass substrates.
PACS 68.37.Uv; 73.20.Mf; 42.25.Dd; 78.67.-n 相似文献
5.
CM Thaker S Rayaprol Krushna Mavani DS Rana MS Sahasrabudhe SI Patil DG Kuberkar 《Pramana》2002,58(5-6):1035-1039
The effect of simultaneous substitution of a fluctuating cation and a divalent cation in LaMnO3 perovskite modifies the properties of the material to exhibit large valence colossal magnetoresistance (CMR) effect. A good
example of these properties is (La1−2x
Pr
x
Ca
x
)MnO3 (LPCMO) type CMR material. In this communication it is reported that, with the increase in x (for x=0.1, 0.15, 0.2), the T
c varies between 100 and 120 K with improvisation in metal-insulator transition. Interestingly, resistance increases with x from few hundred ohms to few kilo ohms with corresponding decrease in the unit cell volume. The results of the studies using
X-ray diffraction (XRD), electrical resistivity, magnetoresistance and ac susceptibility measurements on LPCMO samples for
understanding the structural, transport and magnetic properties are discussed in detail. 相似文献
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Liu H Genov DA Wu DM Liu YM Steele JM Sun C Zhu SN Zhang X 《Physical review letters》2006,97(24):243902
A one-dimensional magnetic plasmon propagating in a linear chain of single split ring resonators is proposed. The subwavelength size resonators interact mainly through exchange of conduction current, resulting in stronger coupling as compared to the corresponding magneto-inductive interaction. Finite-difference time-domain simulations in conjunction with a developed analytical theory show that efficient energy transfer with signal attenuation of less then 0.57 dB/microm and group velocity higher than 1/4c can be achieved. The proposed novel mechanism of energy transport in the nanoscale has potential applications in subwavelength transmission lines for a wide range of integrated optical devices. 相似文献
8.
Seal K Genov DA Sarychev AK Noh H Shalaev VM Ying ZC Zhang X Cao H 《Physical review letters》2006,97(20):206103
Near-field intensity statistics in semicontinuous silver films over a wide range of surface coverage are investigated using near-field scanning optical microscopy. The variance of intensity fluctuations and the high-order moments of intensity enhancement exhibit local minima at the percolation threshold. This reduction in local field fluctuations results from resonant excitation of delocalized surface plasmon modes. By probing the modification of the critical indices for high-order moments of intensity enhancement caused by the delocalized states, we provide the first experimental evidence for the coexistence of localized and delocalized surface plasmon modes in percolating metal films. 相似文献
9.
Zsolt Varga József Fehér Genovéva Filipcsei Miklós Zrínyi 《Macromolecular Symposia》2003,200(1):93-100
The combination of polymers with nanomaterials displays novel and often enhanced properties compared to the traditional materials. They can open up possibilities for new technological applications. The magnetic polymer gel represents a new type of composites consisting of small magnetic particles, usually from the nanometer range to the micron range, dispersed in a highly elastic polymeric gel matrix. Combination of magnetic and elastic properties leads to a number of striking phenomena that are exhibited in response to impressed magnetic fields. Giant deformational effects, high elasticity, anisotropic properties, temporary reinforcement and quick response to magnetic field open new opportunities for using such materials for various applications. 相似文献
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