Materials Literature
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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…
A series of poly(o-hydroxyamide)s having high molecular weights were synthesized by means of low-temperature solution polycondensation of 4,4′-[isopropylidenebis(1,4-phenylene)dioxy]dibenzoyl chloride (1) and 4,4′-[hexafluoroisopropylidenebis(1,4-phenylene)dioxy]dibenzoyl chloride (2) with three bis(o-aminophenol)s. S…
We have investigated the dynamics of the process of annihilation of a wedge disclination pair generated in a nematic cell with hybrid alignment, by quenching it from its isotropic phase. The time evolution of the separation between the defect pair can be classified into two stages: the early stage, with a stringlike p…
Zinc-coated (galvanized) and 55% Al-Zn alloy-coated steel sheet was tested for atmospheric corrosion resistance for 20 years in rural (Saylorsburg, Pennsylvania), industrial (Bethlehem, Pennsylvania), moderate marine (250-m [880-ft] lot, Kure Beach, North Carolina), and severe marine (25-m [80-ft] lot, Kure Beach, Nor…
In this paper, the energy dissipation in soft magnetic materials using the dynamic Preisach model is discussed. The main goal is the establishment of the f/sup 1.5/ law for the excess losses from this hysteresis model. By building up the energy balance of a lamination model combined with the dynamic Preisach theory, t…
Charge‐collection (CC) current was measured at a single grain boundary, which exhibited positive temperature coefficient of resistivity (PTCR) effects, in 0.1‐mol%‐Nb‐doped BaTiO 3 . The CC current systematically reversed across the grain boundary above the Curie point, which indicated the presence of a double Schottk…