Materials Literature
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Using the Mott–Littleton approach we examine the energies of a number of fundamental optical transitions, as well as those involving self-trapped holes of Mn4+ and O− in LaMnO3 lattice. The reasonable agreement with the experiment of our predicted energies, linewidths and oscillator strengths leads us to plausible ass…
Edible coating based on carboxymethyl cellulose (CMC) and stearic acid were applied on green bell peppers (Capsicum annuum L.) samples in order to investigate its effects as protecting agent to enhance natural characteristics of products. Samples were submitted to three lots according to: (T1) uncoated; (T2) coated in…
In the present work, diamond nanoparticles with sizes of ∼2–70 nm have been produced by Ar+ ion irradiation at the fluence of ∼1022 cm−2. With the help of transmission electron microscope, electron diffraction, and Raman spectroscopy, these nanoparticles’ shape and size were determined and their crystal structure was…
Using monolithic alumina ceramics as the reference, the thermal shock behavior of the hot‐pressed alumina matrix ceramics with 3 mol% neodymium titanate was investigated. The thermal shock resistance of the materials was evaluated by water quenching and a subsequent three‐point bending test to determine the flexural s…
Fatigue crack propagation at elevated temperatures (650 and 725°C) has been studied in a powder processed high strength nickel based superalloy, U720Li, in air and vacuum environments, using trapezoidal loading waveforms. Constant load (increasing ΔK) tests were used to generate da/dN-ΔK curves, while interrupted cons…
The helical pitch of the cholesteric liquid crystal (CLC) can be adjusted to reflect the colors red, green, and blue. Additive mixing of these colors in displays results in multicolor images and it is easy to use pure primary blue and green colors, but the red color is in general very unsaturated. We show by simulatio…
Magnetization processes in iron-based materials with edge dislocations were simulated using Monte Carlo method for the purpose of analyzes of the magnetic nondestructive evaluation. RKKY-type exchange interaction was assumed in this simulation using the Heisenberg Hamiltonian of the metal magnetism. The temperature an…
Crystals of a new lead carbonate, NaPb2(CO3)2(OH), sp. gr. P31c, were prepared by hydrothermal synthesis. The crystal structure was established by the heavy-atom method without knowing the exact chemical formula of the compound. The polar structure of the carbonate and the distortion of the pseudosymmetry described by…
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…