Materials Literature
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We use ac susceptibility to study the vortex pinning force anisotropy and the magnetic lock-in effect in the organic superconductor (TMTSF${)}_{2}$${\mathrm{ClO}}_{4}$, which is believed to have an in-plane anisotropy of ${\ensuremath{\gamma}}_{\mathit{b}\mathit{a}}$\ensuremath{\sim}10 and a maximum out-of-plane aniso…
Predominant parameters in the shock-induced transition from graphite materials to diamond were examined in the present study by using quenching and powder methods under pressures of 50–60 GPa and 80–90 GPa, respectively, in the temperature range from 750 to 3500 K. Effects of the material parameters of the starting gr…
Fourier transform infrared internal reflection spectroscopy and X-ray photoelectron spectroscopy XPS have been applied to investigate the surface of polyacrylonitrile-based carbon fibers treated by chemical oxidation and electrochemical oxidation. We have found that infrared spectroscopy has comparable sensitivity to…
Capabilities and limitations of X-ray computed microtomography (CT) in characterizing relevant composite material issues as identified during manufacturing processes were investigated. Damage in engine subcomponents was evaluated and compared with damage detected in pedigreed coupon type specimens. The system used is…
Polarization reversal switching transients of nylon 11 were measured for samples annealed in various conditions. The relation between the ferroelectric properties and hydrogen bonds between main chains is discussed. Polarization reversal of nylon 11 begins by breaking of the hydrogen bonds and ends by linking of them.…
We present a numerical study of the performance of a one-dimensional Confocal Scanning Optical Microscope (CSOM) when used as a profiler of highly reflecting surfaces. The study is conducted by means of a computer simulation that describes the interaction between the incident beam and the sample in a fairly rigorous m…
The diamagnetic susceptibility χ of aligned carbon nanotubes is anisotropic: χ || differs from χ ⊥ . The ratio χ || /χ ⊥ exhibits a singularity at 40 K. Below this temperature χ || differs in samples cooled in magnetic field from those cooled in zero field. This observation suggested interaction of the magnetic moment…
Abstract The relations between the adjoint group and the additive group of a radical ring and its nilpotency are investigated. It is shown that certain finiteness conditions carry over from the adjoint group to the additive group and that the converse holds for the class of minimax groups.
We describe the effects of yarn twist on the structure, properties, and production of a T/C composite yarn. The results show that yarn twist in the special structure of a composite yarn is very critical, and good properties of 19.7 tex T/C composite yam such as high skein strength, good abrasion resistance, and low ir…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDescription of Phase Behavior of Polymer Blends by Different Equation-of-State Theories. 1. Phase Diagrams and Thermodynamic Reasons for Mixing and DemixingBernd Rudolf and Hans-Joachim CantowCite this: Macromolecules 1995, 28, 19, 6586–6594Publication Date (Print):September…
Abstract The sodium salts of carboxylic acids and other weak acids are routinely used as nucleation agents for injection moldable poly(ethylene terephthalate) (PET) resins. One of the primary drawbacks accompanying their use is the degradation of the PET resulting from the attack of the ester by the sodium carboxylate…
Abstract Activated carbons were prepared by ZnCl 2 /CO 2 activation of the chips of oil trunk. The surface area and the nature of the porosity of the resulting activated carbons were found to be related to the concentration of the impergnated zinc solution to the precursor. It is possible to prepare activated carbons…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiodegradation of the cross-linked cationic poly(amino acid) hydrogels by proteolytic enzymesHiroyuki Yamamoto and Yuuki HirataCite this: Macromolecules 1995, 28, 20, 6701–6704Publication Date (Print):September 1, 1995Publication History Published online1 May 2002Published i…
We present a new method to determine the Flory–Huggins polymer–polymer interaction parameter and self- (or tracer) diffusion coefficients in a ternary polymer solution made of two monodisperse polymers and a solvent by quasielastic light scattering (QELS). Previously proposed methods based on the random phase approxim…
The shrinkage process of large pores during hot isostatic pressing (HIP) of presintered Al 2 O 3 and Al 2 O 3 ‐ZrO 2 ceramics has been investigated. Large pores were observed to collapse by grain‐boundary sliding, and then small pores resulting from the misfit of flowed grains disappeared, mainly by diffusion. Due to…
Abstract Recent developments in characterization techniques have permitted estimation of the crosslink density attained in dynamically vulcanized thermoplastic elastomers. The range of techniques available for investigation of the phase morphology of this type of TPE has also increased. The characterization of experim…
Article The Role of Macromolecular Entanglements in the Gel Spinning Process and Properties of High Performance Polyacrylonitrile Fibers was published on September 1, 1995 in the journal Journal of Polymer Engineering (volume 15, issue 3-4).
Scattering of a two-dimensional, spatially partially coherent electromagnetic field by a two-dimensionally-modulated microstructured medium is treated exactly by means of the coherent-mode representation of the cross-spectral density tensor and a rigorous diffraction theory for fully coherent fields. An explicit metho…
Abstract The Carrión lacustrine basin (≈10 km 2 ), central Spain, is filled with Neogene-Quaternary sediments (20–25 m thick) rich in palygorskite. Two clay units of ∼15 m thick are of particular interest in the basin. The lower one contains over 75% phyllosilicates (palygorskite up to 90%, smectites and illite) in ma…
Electric impedance of nematic liquid crystal (5CB) cells has been measured to detect ion behavior. The experimental and theoretical results show that a single type of ion carries a current in 5CB. The thickness of double layer at the surface becomes thinner with decrease in the frequency.