Materials Literature
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To reduce the radiological consequences of postulated severe accidents, the design of future European nuclear reactors includes measures to avoid basemat penetration in case of a core meltdown. The considered retention schemes include a temporary retention of the debris in the reactor pit followed by the spreading of…
Abstract The classical methods available for evaluating the degree of crosslinking in elastomers are stress-strain and swelling measurements. In this study, we have adopted a new analytical approach based on thermoporometry, densimetry and DSC for comparing the crosslinking density in elastomers. Crosslinking by chemi…
The time-periodic finite-element method is applied to hysteretic eddy-current analysis. A new method for determining the relaxation factor of Newton iteration is proposed for fast convergence to periodic solutions. The influence of hysteretic terms in the Jacobian matrix on the Newton iteration is discussed. Applicati…
Ultradisperse particles of CdSe x Te 1− x (0≤ x ≤1) were formed in the matrix of a silicate glass by introduction of corresponding prepared compounds into a mixture of SiO 2 and Ca, Na, K, and Li oxides. Initially produced particles with an average size of 10–15 nm grow by a factor of 2–3 after additional thermal trea…
The coating of fabrics generally involves the use of complex fluids as coating compounds. During the coating process, these compounds are submitted to various stresses. This paper investigates the influence of the rheological properties of the fluid on its penetration into the fabric. Experiments were performed with s…
This paper presents a two-dimensional analytical model of a spiral-shaped PZT ceramic actuator. Developed using elasticity theory and a zero-stress assumption, the theoretical analysis has been formulated for a piecewise semicircular representation of the spiral-shaped actuator. Closed-form solutions of the tangential…
Polyaniline-fullerene composites were prepared by the introduction of fullerene during polymerization of aniline. An investigation of the composites using FTIR and 13 C NMR spectroscopy indicated interaction between fullerene and the imine groups of polyaniline. The formation of a polyaniline-fullerene complex with a…
Short carbon fiber-filled conductive rubber composites have been derived from EVA, EPDM and their 50:50 blend. The electrical and mechanical properties for each system have been studied. The SCF-filled composites show poorer mechanical properties than the carbon black-filled composite because of the lower degree of in…
Abstract This study focuses on the mineralogical and chemical analysis of sediments overlying basaltic basement through which seawater circulates (ODP Leg 168, flank of the Juan de Fuca Ridge). A SEM and TEM-EDX study of the authigenic clays and zeolites allowed the characterization of the hydrothermal phases and the…
Silicon carbide (SiC) particles were modified in situ , using Al 3+ complexes in aqueous media, via control of Al(NO 3 ) 3 concentration and pH. The Al 3+ formed hydrolyzed complexes that adsorbed onto the charged sites on the SiC particle surfaces. As a result, the surface‐modified SiC particles behaved in an alumina…
Carrier transport in porous silicon layers has been studied by the time-of-flight method in the strong injection mode at temperatures T =290–350 K and electric field strengths F =(1.5–7)×10 4 V cm −1 . The electron and hole drift mobilities μ e ≈2×10 −3 cm 2 V −1 s −1 and μ h ≈6×10 −4 cm 2 V −1 s −1 were obtained at T…
The drape attributes of fabrics, number of folds, depth of folds and evenness of folds were measured together with the drape coefficient. The relationship between these measurements and the subjective evaluation of the fabric drape were modelled for each end use on a neural network using back propagation, which can co…
Fourier transform infrared spectroscopy is often used to study liquid crystals and liquid crystal systems. In this work, the factors that influence the IR absorbance of nematic liquid crystals and their consequences on FT-IR imaging are examined. In the IR spectrum of E7, ordering in the nematic phase causes a 28.7% r…
Large epiphytic and epilithic diatom species were observed to act as substrata for other diatoms at freshwater, brackish and marine sites in southern California, USA. The most commonly encountered examples involved species that form long filaments attached to rocks or macroalgae. Biddulphia biddulphiana, B. tridens, O…
A simple new preparation method for silver surface-enhanced Raman scattering (SERS) substrate (Ag/Cu film) was developed by reduction of aqueous Ag + on copper foil, which is used for making print circuit board. The properties of the substrate were evaluated. The approximate limit of detection (LOD) was measured using…
Abstract An experimental investigation has been conducted to evaluate the use of recycled rubbers in blends for the development of new thermoplastic elastomers (TPE) and rubber-toughened plastics. The recycled rubbers were obtained from various commercial sources and included representatives from the EPDM, SBR, and NR…
An x-ray diffuse scattering investigation of p-type porous silicon (PS) is reported. Synchrotron radiation and laboratory measurements of the x-ray diffuse scattering at small and large scattering wave-vector q values are presented. At small q values and for p−-type material, small isotropic crystallites of a few nano…
Abstract The clay mineralogy of sediments collected from the San Simón inlet, the Ría de Vigo, the Galician Platform, the Galician Margin and the Celtic Sea has been studied using XRD, IR and TEM with a microanalytical attachment. All samples consisted largely of dioctahedral mica and kaolin minerals, in addition to s…
Weak-fringing faults have been observed in planar slip bands in a Ti-6 wt% Al alloy by transmission electron microscopy. The magnitude of the contrast was observed to increase with the number of dislocations shearing a particular region in the slip plane, and the fringe contrast was observed to saturate along a slip b…
2-Cyclohexenol (1) is oxidized chemoselectively to 2-cyclohexenone (2a) by the α-Keggin chromium-substituted polyoxometalate (POM) Ia as the catalyst and iodosobenzene as the oxygen source. For the chromium(salen) catalyst IIa the same chemoselectivity in favor of allylic CH oxidation is observed. The manganese-substi…