Materials Literature
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Polarization-selective gratings are designed by use of rigorous electromagnetic diffraction theory. The polarizing effects are attained by special surface-relief structures. We present a scheme for coding two different optical functions in one diffractive element. It is based on a combination of the scalar diffraction…
The α → γ phase transformation, which occurs during quenching and produces extremely fine α2-γ lamellae, is discussed in relation to the analysis of the α2-γ interface structure. In a high-resolution image obtained from the growth edge of a γ plate in the α2 matrix, steps that were always found to be (0002)α2 or (111)…
Abstract We have synthesized four new ferrocene monomers (three diols and one diester). The redox potential of these ferrocene derivatives varies between 0 mV and 230 mV due to different degrees of ring alkylation. Amorphous and liquid crystalline copolyesters were prepared with these monomers in the polymer main chai…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEstimation of Exciton Sizes in Squaraine Monolayers by Intralayer Photoinduced Electron TransferKangning Liang, Kock-Yee Law, and David G. WhittenCite this: J. Phys. Chem. 1995, 99, 45, 16704–16708Publication Date (Print):November 1, 1995Publication History Published online1…
This work summarizes results of a simple procedure to incorporate dopants into the near surface region of single-crystal sapphire. We demonstrate the formation of iron-doped and chromium-doped sapphire thin films by solid-phase epitaxial growth. Amorphous alumina films of about 200–350 nm thickness were deposited onto…
Sorption of Pt, Pd, Ir and Au on polyaniline, synthesised by chemical oxidation of aniline in HC1, from HC1, LiC1 and H2SO4 solutions in the concentration range 0.1 to 10 mol dm-3 has been studied. The as-prepared polyaniline (acid-PANI) and the one treated with 1 mol dm-3 NH4OH (base-PANl) have been used. Analysis of…
Benzene derivatives give, in cyclohexane solution, a strongly emitting (Φ f up to 0.8) excited complex with dibenzoylmethanatoboron difluoride (DBMBF 2 ). The rate constant k ex for the complex formation varies between 3.5 × 10 9 and 2.6 × 10 10 M −1 s −1 depending on the benzene derivative, and the complex emission c…
It has been stated that multistep-lap (MSL) jointed cores show distinct improvements regarding power losses P in comparison to single-step-lap (SSL). On the other hand, model core experiments tend to yield contradictory results. In the paper, special emphasis was put on the underlying physical mechanisms, taking into…
A new description of concentration-dependent ion exchange is presented. A three-dimensional, quasi-chemical approximation is used to estimate the chemical potentials of the exchanging cations. The diffusion coefficient is then expressed as a function of the self-diffusion coefficients, excess interaction energy and ca…
This article investigates, by a novel spectral analysis technique, the possibility of applying conventional x-ray photoelectron spectroscopy to characterize the initial oxidation process. Quantitative analysis of submonolayer native oxides is made possible by spectral decomposition of Si 2p into Si4+, Six+, and Si0+ b…
ABSTRACT Renaturation of α1 chains from shark skin collagen (1) was measured by the increase in optical rotation and viscosity. The rotation change of the α1(1) chains became constant after 18 hr, while the viscosity increased further with time. Size exclusion chromatographic patterns of renaturation products of α1 (I…
Recently, Cherkaev, Lurie, and Milton (1992) established an invariance of stress field in planar linear anisotropic elasticity under a specific shift in bulk and shear moduli; this is now known as the CLM theorem. Motivated by the importance of micropolar models in mechanics of media with micropolar structures, Ostaja…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheory and Simulation of Optical Banded Textures of Nematic Polymers during Shear FlowW. H. Han and A. D. ReyCite this: Macromolecules 1995, 28, 24, 8401–8405Publication Date (Print):November 1, 1995Publication History Published online1 May 2002Published inissue 1 November 1…
The information available on ultrasound field distributions in cleaning baths is limited. Two techniques capable of providing this information have been investigated. The first employs a thermistor probe coated with ultrasound absorbing material and uses the rate of temperature rise when the ultrasound is switched on…
Proteins associated with poly-beta-hydroxybutyrate (PHB) granules were purified from four Acinetobacter strains isolated from modified activated sludge treatment plants. Four predominant proteins of 64 kDa, 41 kDa, 38 kDa and 13 kDa were identified. N-terminal amino acid sequencing of the 64-kDa and 13-kDa proteins fr…
A tubular, hierarchically structured hybrid vascular tissue composed of vascular cells and collagen was prepared. First, a cold mixed solution of bovine aortic smooth muscle cells (SMCs) and Type I collagen was poured into a tubular glass mold composed of a mandrel and a sheath (example of dimensions: inner diameter,…
The boundaries of stable plastic deformation, characterized by critical stresses τi(T), are investigated for single crystals of Cu-2 at.% Mn and compared with those of polycrystals. The single crystals were oriented along [100], i.e. for symmetric multiple glide, or for single glide. Strain rate sensitivity was measur…
Abstract UV-vis absorption spectra of nonplanar dodecaphenylporphyrin H2DPP show a strong solvent dependence caused by the hydrogen-bonding interactions of pyrrole NH protons and pyrrolenine nitrogen lone pairs with solvent molecules.
A 2.8-kb HindIII fragment, containing three open reading frames, has been cloned and sequenced from Clostridium litorale. The first gene grdA encoded the selenocysteine-containing protein PA of the glycine reductase complex, a protein of 159 amino acids with a deduced molecular mass of 16.7 kDa. The second gene (grdB)…
Abstract Polyester macromonomers bearing a polymerizable methacryloyl or 10-undecenolyl group at the chain end were synthesized by the lipase-catalyzed ring-opening polymerization of 12-dodecanolide in the presence of a vinyl ester having the corresponding polymerizable group.