Materials Literature
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The second-harmonic signal generated within poled silica disks is monitored in real time as the sample is etched with hydrofluoric acid. An oscillating signal is observed when the cathodic side of the sample is etched. This result is in good agreement with the condition of zero potential difference between the two sur…
Oxide–oxide composites were evaluated in a novel combustor design requiring higher wall temperatures than the conventional combustors. The evaluation was based on a combination of numerical modeling and experimental rig testing. The modeling included computational fluid dynamics (CFD) calculations whose results were u…
Si 3 N 4 /SiC composite ceramics were hot‐pressed in order to investigate the crack‐healing behavior under stress. Semi‐elliptical surface cracks of 100 μm in surface length were made on each specimen. The pre‐cracked specimens were crack‐healed under cyclic or constant bending stress, and the resultant bending streng…
Packing density, the fiber distribution in a yarn cross section, can to a great extent influence the properties and quality of the yarn. Thus, the need for precise and concise information about packing density becomes a must for an in-depth understanding of yarn structure and hence yarn mechanics. This paper describes…
Crystals of divalent tungstates are characterized by two main luminescence spectral ranges: a short-wavelength (blue) luminescence band in the range 390–420 nm and a group (often two groups) of longer wavelength (green) bands in the range 480–520 nm. For crystals of calcium, strontium, barium, cadmium, magnesium, zinc…
Dipicolinic acid (DPA) and the Ca2+ complex of DPA (CaDPA) are major chemical components of bacterial spores. With fluorescence being considered for the detection and identification of spores, it is important to understand the optical properties of the major components of the spores. We report in some detail on the ro…
Abstract The small particle size and the random stacking of layers has previously hindered systematic structure investigations of montmorillonite. By applying the convergent-beam electron diffraction mode (CBED) of a transmission electron microscope (TEM) with a beam spot of ~800 Å we were able to examine undisturbed…
The physisorption of radiolabeled (125)I(-) ions from aqueous solution and the Brunauer-Emmett-Teller (BET) surface areas of various carbonaceous materials [HiPco single-wall carbon nanotubes (SWNTs), F-SWNTs, cut SWNTs, charcoal, graphite, F-graphite and C(60)] have been measured and compared. By far, cut SWNTs (main…
Semiempirical calculations on the dihydrated Zn (II) acetate and monohydrated Cu(II) acetate structures have been carried out. The optimized structures by the PM3 and AM1 methods were compared with crystallographic data in order to analyze the reliability of the data and its use in the calculations of the structures o…
The effects of crystallographic texture and microstructure are analyzed for polycrystalline tetragonal BaTiO 3 , pseudotetragonal PZN–PT, and cubic BaTiO 3 . For tetragonal BaTiO 3 and pseudotetragonal PZN–PT, we demonstrate that a high anisotropy of the single‐crystal properties induces an apparent enhancement in the…
Rheology is demonstrated to be a sensitive and quantitative probe of weak attractive forces acting in concentrated stable colloidal dispersions through comparison of rheology and small-angle neutron scattering measurements on a model dispersion with added polyampholyte. Polyampholyte-stabilized dispersions are found t…
This paper investigates a nonlinear controller designed to stabilize a single-degree-of-freedom rotary shape memory alloy (SMA) actuated robotic arm. To this end, a bias-type robotic arm was built using 150 pm Flexinol SMA wire. This robot is designed to lift and position lightweight objects. Upon complete phase trans…
We have developed a process for optimizing sewing conditions to minimize seam pucker using the Taguchi method. The process is applied to two different T/C fabrics with the specified experimental design using an optimum orthogonal array table. The parameters selected for optimization are sewing speed, stitch length, se…
Abstract Localized corrosion morphologies of 2195 Al‐Li alloy with various heat treatment in 4.0% NaCl solution (pH 6.5) were investigated, and its corrosion mechanism was studied using a three‐electrode coupling system of α (Al) substituting for the precipitate‐free zone (PFZ), simulated bulk θ′ (Al 2 Cu) and T1 (Al…
Most electromagnetic problems deal with media with unit permeability. However, recent interest in metamaterials necessitated studies of wave characteristics in media with arbitrary permittivity and permeability whose real parts can be positive or negative. This paper presents analysis of wave characteristics on semiin…
In this work we have developed a stacked Ru underlayer and have studied its effects on the improvement of recording performances for CoCrPt-SiO2 granular-type dual-layer perpendicular media. The c-axis distribution ΔΘ50 of the 13.2 nm thick stacked Ru underlayer was 4.5°, which was about 33% smaller than that of Ru mo…
The melt morphology of polystyrene−poly(ethylene oxide) metallo-supramolecular diblock copolymer has been investigated using small-angle X-ray scattering. The two polymer blocks are linked via a bis(terpyridine)ruthenium(II) ion complex, and tetraphenylborate counterions are used to neutralize the copolymer. A highly…
Abstract Resolution of enantiomers through selective crystallisation of diastereomeric inclusion compounds can extend the scope of traditional racemate resolution beyond salt forming compounds. To assess the practical value of this approach the literature was carefully screened and promising results were checked. Also…
ABSTRACT: A study on the influence of the solubilization and diffusion process on the barrier properties of 4 different edible films is presented. The water and oxygen barrier properties of zein, alginate, casein, and chitosan films were measured at 25°C. A mathematical model was fitted to the experimental data to obt…
High-power ceramics of the composition 0.8Pb(Zr 0.5 Ti 0.5 )O 3 –0.2Pb[(Zn 0.8 Ni 0.2 ) 1/3 Nb 2/3 ]O 3 (0.8PZT–0.2PZNN) + 0.5 wt% MnO 2 have excellent piezoelectric and dielectric properties such as d 33 =320 pC/N, ε 33 T / ε o =1227, k p =0.54, and Q m =1265. However, the sintering temperature of this composition is…