Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical nature of conduction in iodine-doped trans-1,4-poly(buta-1,3-diene) and some of its derivatives: the presence of I3- and the effect of double-bond configurationQuan Yuan Shang, Shekhar Pramanick, and Bruce HudsonCite this: Macromolecules 1990, 23, 6, 1886–1889Public…
The equilibrium partitioning of molecular or colloidal solutes between a bulk phase and the interstices of a fibrous matrix is studied in the case when the matrix is of low or moderate density. Geometrical concepts necessary to define a random-fiber model are presented. The concentration profile for hard-spherical par…
We present phase-matched, second-harmonic generation in the ferroelectric liquid-crystal material SCE9 (manufactured by BDH Ltd.). From the analysis of these results, the absolute values of all nonzero components of the d tensor have been obtained. A direct comparison between this material and the most efficient ferro…
The interactions of human hemoglobin (hHb) with the anti-diol epoxide of benzo[a]pyrene (aBaPDE) and with the corresponding tetrols formed by hydrolysis of the epoxide were investigated with the aim of characterizing the covalent adducts formed by reaction of the epoxide with the protein. The major product (80% of the…
Abstract Finite elements with embedded shocks are used to investigate transient strain localization phenomena in frictional solids. In particular, we seek to elucidate the effect of rate sensitivity and inertia on the development of shear bands in solids subjected to impulsive loading. As in the static case, our resul…
We study a renormalization group for a tight-binding Hamiltonian on the standard octagonal tiling. Our method can be generalized to any self-similar quasi-crystal in 2D or even 3D. In the limit of large potentials compared to the hopping parameters, there are numerical evidences that the spectrum is a Cantor set with…
Skin-surface water loss (SSWL) and transepidermal water loss (TEWL) were studied after a plastic occlusion stress test (POST) in visually non-damaged skin treated with 7% sodium lauryl sulphate for 3 days (open application). After removal of the 24-h plastic occlusion, SSWL and TEWL were recorded continuously for 25 m…
Absolute inelastic-electron-scattering cross-sections have been measured in solids at 100 keV from a range of elements in the periodic table. Total inelastic cross-sections integrated over all atomic shells and inner-shell cross-sections have been determined. Comparison is made with previous experimental and theoretic…
A truncated regulatory subunit of cAMP-dependent protein kinase I was constructed which contained deletions at both the carboxyl terminus and at the amino terminus. The entire carboxyl-terminal cAMP-binding domain was deleted as well as the first 92 residues up to the hinge region. This monomeric truncated protein sti…
The $^{35}\mathrm{Cl}$ nuclear quadrupole resonance (NQR) and the quadrupole perturbed $^{2}\mathrm{D}$ NMR have been investigated in (${\mathrm{ND}}_{4}$)${\mathrm{TeCl}}_{6}$ in the temperature range 4.2--85 K. The $^{2}\mathrm{D}$ spin-lattice relaxation rate shows a classical maximum at about 80 K and a broad peak…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA synthesis of polycyclic aromatic compounds by the calcium acetate-induced aromatization of polyoxoalkanedioates generated from diesters and acetoacetate dianionMasahiko Yamaguchi, Koichi Hasebe, Hirofumi Higashi, Minoru Uchida, Akemi Irie, and Toru MinamiCite this: J. Org.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariable photon energy photoelectron spectroscopy on FeCl4-. An unusual electronic structure for high-spin d5 complexesKristine D. Butcher, Stephen V. Didziulis, Bernard Briat, and Edward I. SolomonCite this: J. Am. Chem. Soc. 1990, 112, 6, 2231–2242Publication Date (Print):…
Fracture resistance behavior was characterized for SiC‐whisker‐reinforced alumina composites with porosities ranging from 0.6% to 11.5% The composites were hot‐pressed from an Al 2 O 3 powder with 25 wt% SiC whiskers. Strengths of individual specimens were measured in four‐point flexure either for natural flaws or for…
Poly(methyl methacrylate) (PMMA) was chosen as a model lithographic material to study the effect of A1 Kα radiation and the thermal (flood gun) electron flux on polymer surface. The main chemical changes, which can occur in polymers by radiation, are (1) main-chain scission, (2) cross linking, and (3) volatile product…
We show that the optimum structure of polyisothianaphthene strongly depends on the chain length. Short oligomers have an aromatic structure, while chains consisting of more than 9 monomers exhibit an aromatic to quinoidal transition along the chain.
Using calorimetry and scanning electron microscopy, we have investigated the formation process and phase behavior of a polyurethane-based polymer-dispersed liquid crystal system. We have measured the kinetics and energetics of the cure process during which liquid crystal microdroplets form by phase separation from the…
Abstract Clay dispersion in southeastern USA soils needs to be better characterized, because dispersion influences crusting, infiltration, and erosion of field soils. In order to study dispersion of highly weathered soils, clays separated from Ap and Bt horizons of three soil series from the Georgia Piedmont were equi…
Osteochondral defects in the distal femoral condyles of rabbits exposed to a pulsing direct current exhibits an enhanced quality of repair. The signal, with a peak value of 2 microA repeating at 100 Hz, imposed an electric field in the tissue of 20-60 mV/cm2. Maximum efficacy was seen with a shorter period of exposure…
Methods which consider the effect of grain orientation and work hardening on short-fatigue-crack growth are examined. Fatigue cracks are assumed to form in the most favourably oriented grains on the surface of the specimen and propagate through less well oriented grains. A method of deriving the sequence of orientatio…
The sintering of spherical borosilicate glass powder (particle size 5 to 10 μm) under a uniaxial stress was studied at 800°C. The experiments allowed the measurement of the kinetics of densification and creep, the viscosities for creep and bulk deformation, and the sintering stress which was found to increase with den…