Materials Literature
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Abstract Practical countermeasures to prevent the occurrence of ferroresonance in floating systems are compared. Most attention is paid to the design of practical damping circuits. Existing criteria to determine the necessary ohmic load are evaluated and a new mathematical tool based on harmonic balance is presented.…
Abstract By IR observation, Lewis acid sites of medium strength were found by CO adsorption on a mesoporous Ta-TMS-1 while no basic sites were detected by CO2 adsorption. Methyl migration of methoxy species and formation of methoxy species from adsorbed dimethyl ether were quantitatively demonstrated.
The magnetic and electrical properties of R1−xSrxCoO3 materials (R=La, Pr, Nd, Gd) (0⩽x⩽0.50) are studied. Rare-earths with angular momentum L≠0 enhance coercive field values. They are maximum for R=Nd (the highest L) and much smaller for Gd and La (L=0). The result is interpreted as the contribution of the L–S coupli…
The relaxation of the initial permeability has been measured in polycrystalline Ti-doped Ba–W hexaferrites with nominal composition BaTixFe18−xO27, with x ranging among x=0 and 0.3. The samples have been sintered at different temperatures in the 1250 °C<T<1350 °C range in a reducing CO2 atmosphere and ra…
Abstract Two types of periodic surfaces were fabricated by utilizing two-dimensionally ordered arrays, in one case as a template and in another as a mask. In the first case, a bulb-like microstructured surface was formed, and, in the second, a cylinder-like microstructure. The Raman spectra of these films indicate tha…
The role of magneto-elastic interactions in controlling the magnitude of switching field and coercivity is investigated using sputter-deposited TbFe/FeCo multilayers. In the absence of long-range anisotropy in amorphous TbFe layers, along with negligible magneto-crystalline anisotropy in FeCo layers, reversal behavior…
Abstract An experimental study of film formation and structure development of polyethylene 2,6‐naphthalate (PEN) in single and double bubble tubular film extrusion is presented. PEN was largely stable in film blowing. The films produced were characterized with wide angle X‐ray diffraction, DSC, and Abbe refractometer…
Alloyed In metal-bonded magnets with ρ=∼6.5 g cm−3 were molded from surface-coated fine powders, Zn/Sm2Fe17Nx (x=∼3), under conditions of 1.4 GPa, ∼460 K, and 1.4 MA m−1 by adding an appropriate amount of In metal powder. The resulting In–Zn alloy with an eutectic composition served as the metal binder and the lowered…
The phase transition of orthorhombic sulphur α-S8 to a high pressure amorphous sulphur allotrope (a-S) has been investigated by Raman spectroscopy. The conversion is found to be induced by the absorption of laser light and can be discussed in terms of ring opening followed by cis-trans conversion of the dihedral angle…
When the Ni concentration exceeds about $18%,$ Mn-Ni alloys were expected to support two different noncollinear spin-density wave (SDW) phases. A triple-$Q$ SDW with moments along the crystal diagonals was believed to appear in the fcc phase between ${T}_{N}$ and ${T}_{t}.$ Below ${T}_{t},$ the fct phase with $c>a$…
We investigate the escape rate of a biaxial spin particle with an arbitrarily directed magnetic field in the easy plane, described by Hamiltonian $\mathcal{H}=\ensuremath{-}{\mathrm{AS}}_{z}^{2}\ensuremath{-}{\mathrm{BS}}_{x}^{2}\ensuremath{-}{H}_{x}{S}_{x}\ensuremath{-}{H}_{z}{S}_{z},$ $(A>B>0).$ We derive an e…
Objectives: To entrap methotrexate (MTX) in thermosensitive liposomes, to characterise liposomes for different physicochemical properties and to investigate the potential of liposome entrapped MTX and localised hyperthermia (HT) in management of melanoma B16F1. Methods: Thermosensitive liposomes, made of synthetic lip…
Fluorescence emissions at both 1.31 and 1.55 μm communication windows were observed from Pr 3+ /Er 3+ codoped Ge‐As‐Ga‐S glasses with a single wavelength pumping at 986 nm. The lifetime of the Er 3+ : 4 I 11/2 level decreased as the Pr 3+ concentration increased, and that of the Pr 3+ : 1 G 4 level increased as the Er…
We present a new high energy resonant x-ray scattering study of a brominated chiral liquid crystal material exhibiting antiferro, ferri and ferroelectric smectic C phases. The absorption K-edge of bromine is at much higher energy (13.49 keV) than the sulfur K-edge (2.47 keV) which should enable a wider variety of expe…
Abstract Investigation of third-order optical nonlinearity of complex 1, [C6H5N-R][Ni(mnt)2] where R = p-nitrobenzyl, mnt = maleonitrile-1,2-dithiolate, with 7 ns laser pulses at 532 nm shows that it exhibits negligible nonlinear absorption, but considerable nonlinear refraction. In terms of two calculated figures of…
Complexes of Y(III), La(III), Pr(III), Nd(III), Sm(III), Gd(III), Tb(III) and Dy(III) with salicylaldehyde benzoyl hydrazone, (C6H5CONHN[dbnd]CHC6H4OH), abbreviated as H2L, have been synthesized and characterized. The analytical data are suggestive of 2:3 metal: ligand stoichiometry in the complexes except in the case…
Examination of the gastrointestinal (GI) tract has been performed for decades using barium sulfate. Although this agent has many recognized limitations including extreme radiopacity, poor intrinsic affinity for the GI mucosa, and very high density, no alternative contrast agents have emerged which produce comparable o…
The permeability spectra of composite magnetic materials (NiZn ferrite composites and YIG composites) has been experimentally studied on a wide range in magnetic load C. The resonance frequency decreases with the increasing magnetic load of the mixture. This is attributed to the fading of the magnetic pole on the surf…
The crack‐growth behavior of a yttria‐stabilized zirconia ceramic (8 mol% of cubic‐phase yttria) was studied at room temperature. Double‐cantilever‐beam specimens were loaded with pure bending moments in a specially designed loading fixture inside an environmental scanning electron microscope. Crack‐growth data were o…
Nanoheterogeneous polymer networks based on polyurethanes (PU) were synthesised by utilisation of the competition between reactivity, dynamics and phase separation processes. Oligomeric α,ω-dihydroxyoxolanes (PTHF), 4,4′-methylene-bisphenylisocyanate (MDI), and trimethylolpropane (TMP) were chosen as reaction componen…