Materials Literature
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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…
The effect of flavour absorption on the oxygen permeability of low-density polyethylene (LDPE), polypropylene (PP), polycarbonate (PC) and polyethylene terephthalate (PET) was studied using an isostatic continuous flow system. Polymer samples were exposed to a model solution containing limonene, hexyl acetate, nonanon…
In this paper, a novel and easy-to-implement approach to the harmonic-balance finite-element modeling of electromagnetic devices is presented. The governing system of nonlinear algebraic equations is derived assuming an arbitrary (anisotropic) magnetic constitutive law. It is solved by means of the Newton-Raphson (NR)…
Abstract Hydroxyl‐functionalized three‐arm poly(ϵ‐caprolactone)s (PGCL‐OHs) were synthesized by the ring‐opening polymerization of ϵ‐caprolactone in the presence of glycerol (as the core) and stannous octoate. The effect of the feed ratio of ϵ‐caprolactone to glycerol on the ring‐opening polymerization was studied. Th…
Abstract The study deals with the Payne effect (a substantial decrease in the storage modulus of a particle‐reinforced elastomer with an increase in the amplitude of mechanical oscillations). The influence of temperature, concentration of filler and amplitude and frequency of strains is analyzed on the mechanical resp…
For rotating electric machines, the reluctance forces (Maxwell stresses) acting on the stator teeth are a major cause of noise emission. Next to the reluctance forces, magnetostriction is a potential cause of additional noise from electric machines. First, a thermal stress analogy is used to introduce magnetostriction…
Durch Selbstorganisation bilden Blockcopolymere eine Vielzahl von Überstrukturen mit charakteristischen Abmessungen im Bereich von wenigen Nanometern bis hin zu mehreren Mikrometern. Durch das Zusammenspiel von Supramolekularer Physik und Chemie ergeben sich dabei neue Ansatzpunkte, anorganische, organische und biolog…
The fundamental mechanisms of the deformation of heavily deformed multiphase materials are not clearly understood despite the vast literature and the amount of data on this subject. This paper presents a new plastic flow mechanism observed by in-situ transmission electron microscopy deformation on Cu-Nb continuous mul…
The slip behaviour in coherent and semicoherent metallic bilayer composites is examined by atomic simulation in the Cu/Ni and Cu/Ag systems. The coherent interface in Cu/Ni, although energetically unfavourable relative to the semicoherent interface in thick layers, reveals several interesting phenomena. Linear elastic…
Fabrication and applications are discussed for a visible-wavelength micropolarizer array consisting of a linear polarizer and a micropatterned liquid-crystal (LC) cell. LC alignment direction is controlled by means of depositing an optically transparent gold film at an oblique angle and coating the surface with an alk…
This work deals with the comparison of two identification procedures of Scalar and Vector Preisach Model. The first one is to assume a Preisach function and determine the different parameters with the knowledge of the remanence and the coercivity. The second one is to measure the Everett function directly.
The reaction of α-[P2W15O56]12− with divalent cations M2+ leads to sandwich complexes of the formula [M4(H2O)2(P2W15O56)2]16− (M4P4W30) where M = MnII, CoII, NiII, CuII, ZnII, or CdII. An FeIII tetranuclear sandwich complex has also been obtained. Full details are reported concerning procedures by which the pure sandw…