Materials Literature
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A hysteresis model is developed on the basis of a physical description of domain wall motion in magnetic materials. The mean behavior of a domain wall under the action of an external field is described by a simplified Preisach model. The superposition of several domain wall contributions to the average magnetization i…
Pseudomonas sp. 61-3 is able to produce a blend of poly(3-hydroxybutyrate) [P(3HB)] homopolymer and a random copolymer [P(3HB-co-3HA)] consisting of 3-hydroxyalkanoate units of 4–12 carbon atoms. In a cell accumulating polyhydroxyalkanoates upon glucose or alkanoic acids, both needle-type and mushroom-type structures…
Dielectric constant (ε′) and electrical conductivity ([sgrave]) of the binary mixtures of cholesteryl pelargonate (ChP) and nonyloxybenzoic acid (NOBA) of different concentrations have been measured in the frequency range of 100 Hz to 10 MHz from room temperature to 150°C both in planar and homeotropic alignments. The…
Abstract A pH-sensitive MRI contrast agent whose signal intensity is activated only at the lower pH was newly designed to establish a novel imaging concept which depict microenvironment differences in pathophysiological features of damaged tissues.
A composition‐graded solid electrolyte has been used to determine the standard Gibbs free energy of formation of lanthanum zirconate (La 2 Zr 2 O 7 ) from the component oxides lanthana (La 2 O 3 ) (A‐rare earth) and zirconia (ZrO 2 ) (monoclinic) in the temperature range of 870–1240 K. The cell used for measurement ca…
An approximate theoretical analysis of the tension increase for nonflexible fibers and yams passing around a peg is presented, yielding a convenient, improved capstan equation. The formulas include the influence of fiber and yarn bending behavior on the tension increase, and they correct the capstan equation for outgo…
FePd L1/sub 0/ ferromagnets with ultra-fine microstructures (submicron/nanoscale) have been studied. The powders and thin films with nanoscale microstructure were produced using high energy ball milling and vacuum sputtering, respectively. These ultra-fine grained materials were characterized using TEM, SEM, and X-ray…
Crystals of human heparin binding protein (HBP) diffract to 1.1 A when flash-frozen at 120 K. The atomic resolution structure has been refined anisotropically using SHELXL96. The final model of HBP consists of 221 amino-acid residues of 225 possible, three glycosylation units, one chloride ion, 15 precipitant ethanol…
Pyrocarbon/silicon carbide (PyC/SiC){sub n} and boron nitride/silicon carbide (BN/SiC){sub n} nanoscale multilayers have been fabricated by pressure pulsed-CVI (P-CVI), pyrocarbon, boron nitride and silicon carbide were deposited from C{sub 3}H{sub 8}, BCl{sub 3}-NH{sub 3} and MTS-H{sub 2} gas precursors, respectively…
In most glass-forming materials external perturbations are relaxed in a non-exponential fashion. It is shown that the degree of non-exponentiality is phenomenologically correlated with the departure from simple thermally activated behavior as measured by the fragility index m. In model glass formers such as the Ge-As-…
The Commission on Neutron Diffraction has initiated a project for compiling accurate temperature factors [International Union of Crystallography (1985). Acta Cryst. B41, 374]. Recommended values of the temperature factors of 14 hexagonal close packed (h.c.p.) elements are presented in this compilation.
Abstract A large number of solid fluoride and heteroligand acidocomplex compounds of antimony(III) and bismuth(III) with single and mixed cations has been prepared from aqueous solutions. Their crystal structures and 121,123 Sb and 209 Bi NQR spectra have been investigated in a wide temperature range.
We have developed new bistable twisted nematic (BTN) displays that operate between the −π/2 and 3π/2 twist states and between the π/2 and 5π/2 twist states. Together with the (0,2π) BTN, this forms a set of all possible transmittive BTNs. Experimentally, it was confirmed that several switching wave forms could be used…
Cholesteric liquid crystal polysiloxane oligomers can be prepared in the Grandjean texture and fractured into smaller pieces called flakes. These flakes function as discrete domains whose degree of orientation can be evaluated by means of Fergason's Equation and turbidity. Further, these flakes can be embedded in a ca…
It is shown that globular proteins display a universal average structure factor accounting for their common aminoacid base. This property, linked to the construction of a random elastic network to study the low-frequency dynamics, leads to striking similarities between the physics of globular proteins and that of glas…
A crack induces a local inhomogeneity in the magnetic flux path in a material and any change in crack area results in change in the distribution of magnetic flux. From the results of measurements on A533B steel and Cr-Mo steels, not only were the magnetic properties found to change with crack area, but also a linear r…
The effects of compacting methods, heat treatment and chemical additives on the magnetic properties of NdFeB particles have been studied, Five sets of NdFeB powder particles, doped with different amounts of Dy from 0.1-2.9 wt%, were prepared in powder form by gas atomization and annealed at 650-750/spl deg/C for 600 s…
Electrohydrodynamic convection in freely suspended smectic-$C$ ${(S}_{C})$ and smectic-${C}^{*}{(S}_{C}^{*})$ films is investigated experimentally by means of reflection polarizing microscopy. A two-dimensional vortex flow is observed when a dc field is applied in the plane of the smectic layers while the electrodes a…
A generalized fabric bending model is developed based on the nonlinear bending moment-curvature relationship of fabrics. This model makes it possible to theoretically investigate the effects of fabric nonlinear bending behavior on measured bending prop erty values. The dependence of measured parameters (e.g., bending…
Fully dense fine‐grained 32.6‐vol%‐zirconia‐toughened alumina composites have been fabricated from nanocrystalline rapidly solidified material. A model considering the thermodynamics of the constrained t ‐ZrO 2 m ‐ZrO 2 phase transformation was developed for this percolated two‐phase material. This analysis indicated…