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11.
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
12.
John W.Grove 《数学物理学报(B辑英文版)》2010,30(2):563-594
This article describes mathematical models for phase separated mixtures of materials that are in pressure and velocity equilibrium but not necessarily temperature equilibrium. General conditions for constitutive models for such mixtures that exhibit a single mixture sound speed are discussed and specific examples are described. 相似文献
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Gorman BA Francis PS Dunstan DE Barnett NW 《Chemical communications (Cambridge, England)》2007,(4):395-397
Mixtures of silver(I) and citrate that are used to produce silver nanoparticles evoke intense chemiluminescence with tris(2,2'-bipyridyl)ruthenium(II) and cerium(IV), which can be exploited for the determination of citrate ions and other analytes over a wide concentration range. 相似文献
15.
Polymer solutions are complex fluids that show elasticity and deformation in response to shear flows. A fluorescence resonance
energy transfer (FRET) technique has been applied to measure the end-to-end distances of individual polymer molecules in Couette
flow, using end-tagged reversible-addition fragmentation chain transfer (RAFT) polymerised poly(methyl methacrylate) (PMMA).
Real-time rheofluorescence measurements on these polymers in solution above the critical overlap concentration are reported
at several shear rates. The PMMA in Couette flow shows a systematic decrease in fluorescence, corresponding to a reduction
in end-to-end distance of the polymer molecules with shear exposure. Full reversibility of the fluorescence signal is observed
after the cessation of shear. These results show that polymer solution elasticity arises from compressive deformation of the
polymer molecules in Couette flow. At polymer concentrations above the critical overlap, the polymer molecules are restricted
by their neighbours and the net hydrodynamic forces are compressive rather than extensive. 相似文献
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