Materials Literature
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Abstract The sorption and diffusion of four esters into polypropylene packaging films immersed in four different solutions have been studied by the FTIR method at 45°C. Kinetic curves have been generated for these systems to compute diffusion coefficients. The calculated results are discussed in terms of size and shap…
Abstract In XPS, it is often observed that the x‐ray flux causes changes in the surface structure and chemistry in the surface region of organic materials. However, at present, there is no standard guide to estimate the relationship between the degradation rate and x‐ray source flux. To investigate this relationship,…
To study the influence of a polymeric substrate, hydroxypropylcellulose (HPC), on the dynamics of the nematic mixture E7, the real (ε′) and imaginary (ε″) parts of the complex dielectric permittivity of the unaligned composite system (polymeric substrate covered with liquid crystal) were measured as a function of freq…
Technically and economically optimized insulation systems can only be offered today if there is complete knowledge of phenomena in the winding insulation that determine its service life. This paper describes how such mechanisms are influenced by operating conditions, how they are detected using modern diagnosis method…
Direct measurements of individual bubble oscillations in lithotripsy fields have been performed using light-scattering techniques. Studies were performed with bubble clouds in gassy water as well as single levitated bubbles in degassed water. There is direct evidence that the bubble survives the inertial collapse, reb…
Samples of PC/PET blends, prepared by reactive blending in the presence of different catalysts, were analyzed by 1H NMR and DSC, in order to evidence the effects of the transesterification reactions on the molecular structure and thermal properties. The 1H NMR analysis evidences the formation of copolymers whose degre…
The paper presents a comparative analysis of different theoretical iron losses evaluation techniques, coupling finite-element calculations and material modeling. This coupling can be performed at different levels: as a postprocessing step or inside the nonlinear solution loop. Comparisons on an induction machine struc…
The 3-keto-L-gulonate 6-phosphate decarboxylase (KGPDC) encoded by the ulaD gene in the Escherichia coli genome [Yew, W. S., and Gerlt, J. A. (2002) J. Bacteriol. 184, 302-306] and orotidine 5'-monophosphate decarboxylase (OMPDC) are homologous (derived from a common ancestor) but catalyze different reactions. The met…
A new cellulosomal protein from Clostridium cellulolyticum Cel9M was characterized. The protein contains a catalytic domain belonging to family 9 and a dockerin domain. Cel9M is active on carboxymethyl cellulose, and the hydrolysis of this substrate is accompanied by a decrease in viscosity. Cel9M has a slight, albeit…
A higher anticancer activity is observed in photodynamic tests with the first sterically bulky (nonplanar) perhalogenated zinc phthalocyanine (Pc), [F64PcZn(acetone)2] (see structure: F green, N blue, O red, C gray) in comparison with planar zinc perfluorophthalocyanine. The perfluoroisopropyl substituents enhance the…
Valve wear has been a problem to engine designers and manufacturers for many years. Although new valve materials and production techniques are constantly being developed, these advances have been outpaced by demands for increased engine performance. The aim of this work was to establish the effect of engine operating…
This paper presents a method based on genetic algorithms and neural networks suitable for finding the five parameters of the Jiles-Atherton (JA) model for generalization to dynamic hysteresis loops. The aim is to obtain an equivalent static model for dynamic loops by updating its parameters varying the frequency of th…
Numerous studies have reported marked sensitivities of diatom species to phosphate and organic pollution but have ignored interactions with other common contaminants. The aim of the present study was to investigate the single and joint effects of increased phosphate and metal (cadmium, zinc) concentrations on benthic…
Sintered xerogel films (porous SiO2) show a much higher thermal conductivity than other low dielectric constant (low-K) materials available for the same value of K. The thermal conductivity of xerogels which we have processed using different methods is compared with that of other low-K materials such as silica hybrid…
Shape memory and pseudoelastic effects are thermomechanical phenomena associated with martensitic phase transformations, presented by shape memory alloys. The dynamical analysis of intelligent systems that use shape memory actuators involves a multi-degree of freedom system. This contribution concerns with the chaotic…
In many technical applications, ranging from composites to body armor, fabrics that are mouldable can be very useful. This paper investigates the mouldability of angle-interlock woven fabrics, which have low shear rigidity compared to woven fabrics with other weave structures. Angle-interlock fabrics with different st…
Carbon paste electrode modified with H3(PMo12O40). X H2O (PMo12) which was encapsulated in the channel surface of MCM-41 modified with 3-aminopropyltriethoxysilane was prepared and characterized. The chemical interaction between PMo12 and the support was stronger on the modified MCM-41 than on unmodified MCM-41. The l…
Abstract— We have fabricated a 13.3‐in. XGA (1024 × 768) TFT sequential‐color liquid‐crystal display using optically compensated birefringency (OCB), illuminated by an LED backlight. We fabricated the sequential‐color display feasible process technology, and examined the performance and potential of a field‐sequential…
Ba 0.6 Sr 0.4 TiO 3 thin films were epitaxially grown on (001) MgO substrates using pulsed laser ablation. Cross-sectional and plan-view transmission electron microscopy have been employed to study the microstructures and the interface behavior of the as-grown thin films. The 110-nm-thick Ba0.6Sr0.4TiO3 thin films hav…
End-linked polydimethysiloxane (PDMS) networks were prepared by end-linking vinyl-terminated PDMS chains with tetrafunctional silanes. Dielectric α-relaxation spectra, thermal expansivities, and the (rubbery) elastic modulus were measured for these materials. From the cross-link density at which marked changes occur i…