Materials Literature
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The ground-state energies in magnetic fields are calculated for the electron crystals with the bcc and fcc structures at low electronic densities. The energies are obtained as sums of the static energy and the zero-point vibration energy in the harmonic approximation. The zero-point energy of the fcc becomes lower tha…
The rotational viscosity ${\ensuremath{\gamma}}_{1}(T)$ of a nematic is of dominant importance for wide operating temperature display applications. In this paper we show that ${\ensuremath{\gamma}}_{1}(T)$ is, except for a small prefactor variation, a universal function of $T\ensuremath{-}{T}_{g}$ where ${T}_{g}$ is t…
Deuteron NQR spectra of several model systems involving alcoholic of phenolic-OD groups are discussed. The spectra of alpha hydroquinone and its two isomers resorcinol and catechol show complex structure due to the presence of inequivalent O–D⋅⋅⋅O hydrogen bonds. In the case of hydroquinone, this structure collapses t…
The microstructure of two commercial 2:17 precipitation hardened rare-earth magnets has been examined and compared with the magnetic properties. Transmission electron microscope studies on Sm(Co,Fe,Cu,Hf)7.25, Hicorex 99C show a fine cellular microstructure with 2:17 rhombohedral cells surrounded by coherent 1:5 hexag…
The infrared spectra of Ni1−xCuxFe2O4 (x=0, 0.1, 0.2) studied at room temperature in the range of 250–800 cm−1 show two main bands. On adding copper to nickel ferrite, the center frequency of these two bands is found to shift to lower energies. The force constants obtained using the center frequency have been observed…
Effects of Si addition into amorphous (Fe0.064Co0.936)76.5 -B23.5 alloy having zero magnetostriction were investigated by the measurement of high-field magnetization at room temperature in the field range 150≤H≤13 000 Oe. The FeCo-B alloy shows anomalies in both the law of approach to saturation and the para process.…
Abstract The sol content of previously extracted samples of lightly crosslinked silicone rubber has been found to increase during prolonged storage under relatively mild conditions. Simultaneously, the tensile stress slowly decreases in samples held stretched, and the equilibrium degree of swelling increases somewhat.…
A lattice model with full rotational invariance is proposed for describing nematic liquid crystals. Orientational long-range order at low temperature is proved using the infrared bound method.
An apparatus is described which is used to measure the magnetic field vectors in electrical steel sheets in rotating magnetic fields. To avoid complicated eddy current effects we produce a rotating B-vector with constant modulus and angular velocity. Considerable variations of the modulus of the magnetic field strengt…
The applications of ferromagnetic amorphous alloys provide an excellent example of the unpredictable nature of the benefits from research and from the development of a technology. This paper traces a brief history of applications of amorphous alloys as soft magnetic materials. Specific applications are then discussed…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational spectra and analyses of the S42+, Se42+, Te42+, and trans-Te2Se22+ polyatomic cationsRobert C. Burns and Ronald J. GillespieCite this: Inorg. Chem. 1982, 21, 11, 3877–3886Publication Date (Print):November 1, 1982Publication History Published online1 May 2002Publi…
Abstract A long‐term experiment was conducted on a highly acidic (pH 4.6), coarse‐textured Ultisol (Typic Paleudult; loamy, siliceous, isohyperthermic) in the high rainfall region of southeastern Nigeria in order to evaluate the requirement for and residual value of lime [Ca(OH) 2 ] to a continuous crop rotation, and…
Abstract A comparative experimental study of the rheological properties of four cis -1,4 polyisoprenes, two naturally occurring and two synthetic, is reported. The two naturally occurring elastomers are from the hevea tree and guayule bush, and the synthetics are produced by alkyl lithium and Ziegler catalysts. Transi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal reactivity of poly(styrene peroxide): a thermodynamic approachK. Kishore and K. RavindranCite this: Macromolecules 1982, 15, 6, 1638–1639Publication Date (Print):November 1, 1982Publication History Published online1 May 2002Published inissue 1 November 1982https://pu…
Abstract The concept of using optical fibers to distribute light within heterogeneous photo‐assisted catalysts is extended to photo‐electrochemical cells. The potential drop in a semiconductor photo‐electrode is predicted for various types of ohmic electrical contacts, and the optimum contact location is determined. T…
The magnetic behavior of hcp-Fe (epsilon iron) has been investigated by the Mössbauer Effect over a wide range of temperature T, pressure P, and applied magnetic field H0. The internal field Hi of the induced moment is given by Hi=0.20±0.01 H0 and is independent of T and P. Enhanced paramagnetism is suggested as the m…
Light propagation in helical structures is formulated as an eigenvalue problem based on Berreman's 4×4 matrix. Diagonalization of the secular equation is carried out to obtain the optical eigenmodes as a function of wavenumber and propagation direction relative to the helical axis, and sets of the optical eigenmodes a…
Slip bands and the corresponding dislocation structures in [111] aluminium single crystals at various strains have been simultaneously studied in detail by high-voltage electron microscopy to investigate the mean free path of mobile dislocations. The length of the slip bands is determined by the cell size at every str…
The effects of stress coaxial, transverse, and biaxial relative to applied field on magnetization, susceptibility, and domain wall configurations are derived and confirmed using rod, hollow cylinder, and hollow toroid steel samples. The effective stress σ=σ∥−σ⊥ is linearly proportional to pressure on 90° domain walls…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReversible iron-nitrogen migration of alkyl, aryl, or vinyl groups in iron porphyrins: a possible passage between .sigma. FeIII(porphyrin)(R) and FeII(N-R)(porphyrin)complexesDaniel Mansuy, Jean Paul Battioni, Daniel Dupre, Eric Sartori, and Genevieve ChottardCite this: J. A…