Materials Literature
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The time dependence of the complex dielectric constant ε of ferroelectric ceramics is well known as aging which is ascribed by most authors to a modification of the 90°-domain walls. Measurement of aging of Fe-doped PZT ceramic (rhombohedral) and Cr-doped BT ceramic (tetragonal), show that aging in these ceramics can…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActinide thermodynamic predictions. 3. Thermodynamics of compounds and aquo-ions of the 2+, 3+, and 4+ oxidation states and standard electrode potentials at 298.15 KSteven G. Bratsch and J. J. LagowskiCite this: J. Phys. Chem. 1986, 90, 2, 307–312Publication Date (Print):Jan…
Two chemical bleached pulps were treated with a crude enzyme mixture in the presence of HgCI2, (1 mM). Such treatment inhibited endo-cellulases. Xylans were- thus subjected to selective in-situ hydrolysis. The enzyme-treated pulps car. be compared to slightly beaten pulps. The modified fibers show external fibrillatio…
Abstract Experimental measurements have been conducted of Knudsen diffusion through a model porous medium fabricated by the pelleting of monodisperse silica spheres. Tortuosity factors for this random‐assemblage‐of‐spheres porous solid are calculated and compared with values obtained from both theory and measurements…
Pepsin-solubilized bovine corium collagen was purified, reconstituted, and treated with various levels of glutaraldehyde. Treatment of suspensions of fibrillar collagen with low concentrations of glutaraldehyde appeared to have little effect on the gross morphology of fibrils, as judged by electron microscopy, but did…
Saturation effects in transformers and shunt reactors can produce harmonics in power systems. Their magnitude can sometimes be found with an electromagnetic transients program, by going from an approximate linear ac steady-state solution directly into a transient simulation in which the nonlinear effects are included.…
A new analytical function is proposed for absorption correction. It is expressed by surface harmonics with polar angles that specify the primary and secondary beam directions. This function has an advantage over Fourier expansion because it is rotationally invariant. Two empirical, methods are used to determine the ex…
Description Emphasizes toughness as related to damage tolerance of advanced composites. Discusses the problems researchers face in characterizing and analyzing the complex failure mechanisms associated with stress concentration and delaminations. Contains several papers on multi-dimensionally reinforced materials in t…
A Wien Filter electron spectrometer has been successfully combined with a dedicated scanning transmission electron microscope (STEM) to obtain an energy resolution of 140 meV with a specimen collection semiangle of 25 mR at 100 keV. A cold-field emission electron source is used to produce a 0.35–10-nm-size electron be…
We show explicitly that, in a realistic model of diffusion-controlled dendritic solidification, Ivantsov's continuous family of steady-state needle crystals is destroyed by the addition of surface tension. Our starting point is the exact integro-differential equation for the one-sided model, in two dimensions, in a mo…
Abstract Commercial high density polyethylene and polyamide‐6 (PA) resins were melt blended in the Brabender Plasticorder twin‐screw extruder. The blends containing zero to 30 wt percent of polyamide‐6 were examined in dynamic and steady state shear at 150, 200, and 250°C. The Theological test results are discussed in…
Electron-energy-loss spectra of all core-level absorption edges of MgO microcrystals were recorded in the transmission mode using 60-keV electrons. The low-noise signal attained at a resolution of 0.5 eV reveals details of fine structure in the near-edge region. The spectra obtained were analyzed by the application of…
The ability of 21 nonencapsulated and 15 encapsulated coagulase-negative staphylococci (CNS) to adhere to xylene in xylene-water emulsions and to fluorinated poly(ethylenepropylene) (FEP) films revealed remarkable differences. Nonencapsulated CNS strains adhered well to FEP, whereas their adherence to xylene ranged wi…
A new actuator of a joint mechanism is proposed, composed of two TiNi alloy wires. First, the static and dynamic properties of the TiNi alloy wire that were not known are analyzed. Then the mathemati cal model of the actuator is induced. Next, the control sys tems of the actuator are synthesized by pulse width modu la…
Fabrication de composites par infiltration et depot chimique en phase vapeur de SiC dans une structure fibreuse de SiC. L'utilisation d'un gradient thermique et d'un ecoulement gazeux force permet de reduire la duree d'infiltration. On etudie les proprietes mecaniques de ces composites
Si(001)-2×1 single-domain structure has been observed by reflection high-energy electron diffraction (RHEED) after a substrate annealing at a temperature of 1000°C for 20 min. This implies surface steps have been changed from monatomic layer to biatomic layer height by the annealing. It was found that the single-domai…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBis axially coordinated (phthalocyaninato)ruthenium(II) compoundsWolfram Kobel and Michael HanackCite this: Inorg. Chem. 1986, 25, 1, 103–107Publication Date (Print):January 1, 1986Publication History Published online1 May 2002Published inissue 1 January 1986https://pubs.acs…
Type V collagen and type I collagen were obtained from human placentas by pepsin treatment, followed by salt fractionation. The precipitates formed at 37 degrees C from a mixed solution of type V collagen and type I collagen, reacted with antibodies to either type V collagen or type I collagen. The precipitates seen b…
We examined collagen materials for soft tissue augmentation [Zyderm Collagen Implant (ZCI), glutaraldehyde cross-linked (GAX) collagen, and Koken Atelocollagen (Atelocollagen)]; hemostatic collagens [Gelfoam Gelatin Powder (Gelfoam), Avitene Microfibrillar Collagen Hemostat (Avitene), and Collastat Collagen Hemostat (…
The two-dimensional random-parking limit is the area fraction of a plane covered by circles when the circles are added sequentially in a random way, without overlap, until no further circles can be added. As yet, no analytical solution exists for this limit. Several computer simulations and one experimental study have…