Spheric domains in smectic liquid crystals
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Age-related Differences in Human Skin Collagen: Solubility in Solvent, Susceptibility to Pepsin Digestion, and the Spectrum of the Solubilized Polymeric Collagen Molecules
Age-related differences of human skin collagen in solubility, susceptibility to pepsin digestion, and the spectrum of collagen molecules were systematically examined. Less than .5% of the skin collagen were solubilized in a neutral salt solution. The solubility in acetic acid decreased rapidly during maturation and th…
Diamond Anvil Pressure Cell and Pressure Sensor for High-Temperature Use
A new modification of the diamond anvil pressure cell was made for high-temperature and high-pressure use. After this modification, a high temperature of up to 700°C could be obtained at a pressure of up to 7 GPa. Various sensor materials for pressure measurement at high temperatures were also investigated. It was fou…
Magnetic performance of step-lap joints in distribution transformer cores
The magnetic characteristis of cores with step-lap joints are analyzed by using the finite element method taking into account eddy current and magnetic saturation. The effects of the following factors on the magnetic characteristics such as flux and eddy current distributions and magnetizing current are clarified quan…
Diffusion and localized swelling resistances in glassy polymers
Abstract The sorption of swelling penetrants in glassy polymers is modeled as a diffusion problem with moving boundary. The velocity of the swelling front is related to the stress exerted by the penetrant on the glassy matrix at the moving boundary. The solvent stress is considered as the sum of the osmotic tension an…
Soliton Propagation in Liquid Crystals
Soliton propagation in nematic liquid crystals under shear is shown to be possible and studied theoretically. Calculations including those pertaining to the modulation of monochromatic or white light passing through such a liquid-crystal cell are presented. Recent experiments are interpreted accordingly and are in goo…
Differences in magnetic properties between amorphous and crystalline alloys
The magnetic properties of the following intermetallic compounds were determined: HFCo2, HfCo3, Hf6Co23, HfCo7, TaCo2, TaCo3, NbCo2, and NbCo3. Several amorphous alloys of the type Y1−xCox (in the concentration range x=0.30 to x=0.55) were prepared by melt spinning. Their magnetic properties have been compared with th…
Stabilization of water/oil/water multiple emulsions by polymerization of the aqueous phases
In order to improve the stability of w/o/w multiple emulsions which have isopropyl myristate as the non-aqueous 'oil' phase, either the internal aqueous phase of the multiple system or the secondary (outer or continuous) aqueous phase can be gelled. Production, by gamma-irradiation, or cross-linked polyacrylamide or p…
The Rheology and Processing of Olefin-Based Thermoplastic Vulcanizates
Abstract Olefinic thermoplastic vulcanizates (OTV's) comprise rubber in the form of discrete, completely crosslinked particles uniformly dispersed in an olefinic thermoplastic matrix. By their nature, they flow like filled polymer melts: die swell is low, and shows evidence of a particle association at low shear rate…
Radiation Damage in a Rare‐Earth Silicate With the Apatite Structure
The effects of radiation on the rare‐earth silicate, Ca 2 Nd 8 (SiO 4 ) 6 O 2 , with the apatite structure was investigated using 244 Cm doping and alpha, gamma, and electron irradiations. Amorphization of the initially crystalline material was observed to occur only in the Cm‐doped material. Alpha irradiation produce…
Magnetic properties of compositionally modulated thin films
The magnetization density per cm3 of Ni-content of compositionally modulated Cu–Ni thin films at 5 K was found to depend on the modulation wavelength (λ) and amplitude (A) and reached ∼90% of that of pure Ni. Short-λ and low-T studies on Cu–Ni showed an inter-wavelength coupling of the moments of Ni-rich regions that…
Dehydrochlorination of poly(vinyl chloride) by aqueous sodium hydroxide solution under two‐phase conditions
Abstract The reaction of poly(vinyl chloride) powder with aqueous sodium hydroxide solution in the presence of quaternary ammonium or phosphonium halides yielded dehydrochlorinated products of conjugated polyene structure. The reaction was discussed in terms of a phase transfer catalytic mechanism between aqueous and…
Relationship between microstructures and magnetic properties of ferrites containing closed pores
A model for the effect of demagnetizing field caused by closed pores and grain boundaries in ferrites was developed. This paper presents the expressions to transform the magnetic properties free from the demagnetizing field into the apparent magnetic properties. The expression for the apparent permeability is\mu_{app}…
Argon branching ratios for spectral intensity calibration: a reply
Branching ratios have been obtained for 33 lines originating from nine levels in Ar ii by Fourier spectroscopic measurements on a high-current hollow cathode. The values are compared with recent literature data.
Low‐frequency and high‐frequency relaxations in dynamic electric birefringence of poly(γ‐benzyl‐L‐glutamate) in m‐cresol
Abstract The dc component Δ n of the electric birefringence of poly(γ‐benzyl‐ L ‐glutamate) in m ‐cresol is measured under an ac electric field at frequencies from 0.5 Hz to 200 kHz for solutions covering the dilute and semidilute regions. The dispersion curve indicates that at low frequencies Δ n decreases with incre…
Electrochemical synthesis and characterization of the single-electron oxidation products of ferric porphyrins
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical synthesis and characterization of the single-electron oxidation products of ferric porphyrinsMartin A. Phillippi and Harold M. GoffCite this: J. Am. Chem. Soc. 1982, 104, 22, 6026–6034Publication Date (Print):November 1, 1982Publication History Published onli…
Electron Spin Resonance Investigation of Mn2+ Complexation in Natural and Synthetic Organics
Abstract Mechanisms of Mn 2+ bonding in soil organics and pure organic compounds were compared by using electron spin resonance (ESR) spectroscopy. The observation that Mn 2+ in lower‐than‐cubic symmetry produces a very broad signal was used to quantitatively determine the degree of metal complexation by organics. As…
An analysis of the moisture‐related properties of hydrolyzed polyester
Abstract Alkaline hydrolysis causes pitting of the surface of polyester (PET) fibers and films and improves their wettability, as indicated by contact angle measurements. The enhanced wettability is due to an increase in either the number or the accessibility of polymer hydrophilic groups to water and/or an increase i…
Conditioning Surfaces to Suit the Biomedical Environment: Recent Progress
One major determinant of the suitability of various engineering materials for use in biological settings is the relative strength of adhesion obtained between those materials and their contacting viable phases. Maximal adhesive strength and immobility are desired for orthopedic and dental implants, for example, while…
Solute and solvent diffusion in Zr-V alloys
Solute and solvent diffusion in Zr-V alloys (V∼0–2 at.%) have been studied in the temperature ranges 1166–1480 K and 1167–1476 K, respectively, using the sectioning method. With increasing V content, the diffusion parameters D0 and Q for 48V diffusion vary from 8·9 to 0·7 × 10−9 m2 s−1 and 116·55 to 94·16 kJ mol−1, re…