Materials Literature
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Abstract The core–shell structured particles which comprise rubbery and glassy layers were prepared by emulsifier‐free emulsion polymerization of poly(n‐butyl acrylate/methyl methacrylate)/poly(methyl methacrylate/n‐butyl acrylate) [P(BA/MMA)/P(MMA/BA)]. The core–shell structured particle toughened PVC blends were inv…
We present linear stability results based on the three-dimensional Stokes equations for chemically reacting, propagating fronts giving rise to an unstable density stratification in a Hele-Shaw cell. The results are compared with the experiments in M. Böckmann and S. C. Müller [Phys. Rev. Lett. 85, 2506 (2000)], as wel…
In the late phase of a severe reactor accident, the molten corium interacts with the vessel wall, and it can lead to the failure of the lower head. Through the failed bottom wall, part of the corium can flow into the cavity, and air can enter the primary circuit. The residual fuel in the core periphery will be further…
Abstract The crystal structures of eight compounds with compositions A 2 Me 2+ ( X O 4 ) 2 · 2H 2 O ( A = Na, X = S, Me 2+ = Mn, Cd; A = Na, X = Se, Me 2+ = Mn, Co, Ni, Zn, Cd; and A = K, X = Se, Me 2+ = Co) were investigated using single crystal X-ray CCD diffraction data. The Mn- and Cd-compounds crystallize in the…
Nanocrystalline diamond particles with 200–500 nm in diameter have been prepared in a 13.56 MHz low pressure inductively coupled CH4/CO/H2 plasma. The chemical bonding map was investigated by electron energy loss spectroscopy (EELS). The EEL spectrum shows a peak at 290 eV due to σ* states and the energy loss near-edg…
Abstract A nearly monomineralic 1.5 m thick bentonite bed sampled in Melo (Uruguay) appears to be a pure high-charge montmorillonite: [Si 3.94 Al 0.06 ](Al 1.40 Fe 3+ 0.11 Ti 0.02 Mg 0.49 Mn 0.01 )O 10 (OH) 2 Na 0.01 K 0.08 Ca 0.18 . However, contrasting swelling behaviours have been demonstrated by fitting the experi…
A model is proposed describing the corium pool behavior with a material composition presenting a miscibility gap. The model is described in the first part of this paper, and the state of its validation is developed in the second part, against SIMECO experiments. Qualitatively the model predicts the experimental behavi…
Abstract This paper describes the results of an extensive study involving the continuous ultrasonic devulcanization of unfilled EPDM rubber. Die pressure and ultrasound power consumption were measured as a function of processing conditions. The mechanical properties of aged and fresh revulcanized EPDM rubber were meas…
Transmission electron spectroscopy is used to examine the low-energy electron transport and emission properties of nanocrystalline chemical-vapor-deposited diamond films. In particular, the intensity and energy distribution of transmitted electrons are measured as a function of film thickness and incident-beam paramet…
The three-dimensional cyano-bridged bimetallic compound of formula [{Co(H 2 O) 2 } 2 Mo(CN) 8 ]·4 H 2 O is described. The single-crystal X-ray structural determination revealed that the compound has a polymeric structure based on a network of [Mo IV (CN) 8 ] units and Co II ions. Each Mo(CN) 8 building block is linked…
The authors have improved a circuit model of transformers by defining a conductance whose losses will be close to the iron losses under any circumstance. Connecting a constant conductance G/sub cs/ in parallel with the main magnetizing inductance is very popular in the literature; however, it is acceptable only if the…
The temperature dependence of the resistivity of nanotubular polyaniline (PANI) doped with H3PO4 and β-naphthalene sulfonic acid (NSA) synthesized by a “template-free method” has been investigated. The molar ratios of H3PO4 (NSA) to aniline monomer (represented by H3PO4/An and NSA/An) of the samples are H3PO4/An=0.01,…
BACKGROUND AND AIMS OF THE STUDY: As progress is made in the development of a tissue-engineered cardiac valve, the need for a reliable cell source is particularly important. A technique has been developed for the reliable biopsy of tricuspid valve leaflets. Expanding the harvested cells in culture is feasible and prov…
Fourteen thermotolerant and thermophilic bacterial isolates from a hot spring in Guanajuato State, Mexico, were tested for their ability to induce the corrosion of carbon steel in monocultures and, in selected cases, in mixed cultures and co-culture with a sulfate-reducing strain, SRB-M. Characterization by 16S rDNA s…
Tryptophan synthase from hyperthermophile, Pyrococcus furiosus, was found to be a tetrameric form (22) composed of and 2 subunits. To elucidate the relationship between the features of the subunit association and the thermal stability of the tryptophan synthase, the subunit association and thermal stability were exami…
Thermal processing of a rice husk sol in air at T ≥750°C leads to the phase transformation of amorphous silicon dioxide (SiO 2 ) into crystobalite (type B samples). Thermal treatment of the same sol at T ≈ 1400 °C in a closed graphite crucible leads to the formation of a mixture comprising hexagonal SiC phases and gra…
The dynamic compressive strength and microscopic failure behavior of TiB 2 /Al 2 O 3 ceramic composites with a range of microstructural morphologies and size scales are analyzed. A split Hopkinson pressure bar is used to achieve loading rates of the order of 400 s −1 . The time‐resolved analysis of the mechanical resp…
In this paper results of calculations of structural and electronic properties of stoichiometric and nonstoichiometric indiumphosphide clusters with up to around 200 atoms are reported. The calculations were carried through using a simplified LCAO-DFT-LDA-TB scheme. We studied finite spherical parts of the zinc blende…
Abstract Peroxide crosslinking of EPDM is commonly applied in rubber practice. Although the presence of a diene termonomer is not a prerequisite for peroxide crosslinking, it does provide a significant increase of the peroxide crosslinking efficiency. Different explanations for the effect of the type and the amount of…
This paper attempts to theoretically analyze the tension and pressure decay of a single layer tubular elastic fabric used for pressure garments. In the theoretical analysis, we assume that the exponential decay model of the fabric tube on pressure and tension is used and supported by the experiment. We also reveal tha…