Materials Literature
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O trabalho trata da formação de solos arenosos hidromórficos com morfologia de Espodossolo, encontrados em extensas planícies, onde ocorrem áreas isoladas de Latossolos, em terrenos ondulados e bem drenados de colinas. O objetivo do estudo é elucidar a existência de relação pedogenética num sistema Latossolo-Espodosso…
Our previous modeling of hopping in localized bandtails has improved the description of electrical transport in amorphous carbon films and elemental amorphous semiconductors. This model is further developed to understand the role of the wavefunction localization radius γ—1 and density of states (DOS) distribution N(E)…
Abstract The isolation and identification of eighteen components from the leaves of Schefflera taiwaniana are presented. Their structures were determined on the basis of spectral data as well as direct comparison with authentic samples. These compounds include two polyacetylenes, one carotenoid‐like, three sesquiterpe…
We have incorporated nematic liquid crystal into periodic, polymer host structures templated from self-assembled colloids. Using these composite materials, we demonstrate the first electrically switchable three-dimensional Bragg diffraction. The switchable beam deflection is potentially useful for non-mechanical beam…
The initial rise method is one of the most reliable methods for evaluating the activation energy (E) of a single glow peak. However, this method gives erroneous values of activation energy in cases where the thermal quenching effect is present during the initial rise measurements. It is well established that the therm…
A lattice model for an electrolyte solution is proposed, which assumes that the hydrated ion occupies τ i ( i = 1, 2) sites on a water lattice. A lattice site is available to an ion “ i ” only if it is “free” (it is occupied by a water molecule, which does not hydrate an ion) and has also at least (τ i − 1) first-neig…
A Lagrangian finite element algorithm is described for solving two‐dimensional, time‐dependent free surface fluid flows such as those that occur in industrial printing processes. The algorithm is applied using a problem specific structured meshing strategy, implemented with periodic remeshing to control element distor…
We report on the absorption coefficient at 355 nm laser wavelength for 4H- and 6H-SiC over a wide temperature range. The measurements were carried out using a depth- and time-resolved free-carrier-absorption technique. The values of the absorption coefficient for the fundamental E ⊥ ĉ and E ‖ ĉ light polarization were…
The contribution presented here is the development of the system for qualitative prediction of garment appearance quality. The starting point for designing such a system is a qualitative evaluation of garment appearance quality, based on the study of relation of fabric mechanical properties and achieved quality level…
Molecular simulations and in situ atomic force microscopy (AFM) experiments are used to demonstrate the influence of the ionic strength of the solution and the mechanism of growth inhibitors on growth and dissolution of barite with some comparative experiments on celestite. Growth and dissolution rates, as determined…
At Forschungszentrum Jülich, glass-ceramic materials from the BaO-CaO-Al2O3-SiO2-system are used to join high temperature fuel cell stacks. Requirements for the sealant and characterisation of the glasses are shown in this paper. Characterisation is done in three steps: determination of glass properties, characterisat…
J Antimicrob Chemother2001; 48: Suppl. S1, 43–57 In Table V the lower breakpoint for cefoperazone of 1 mg/L has been used to allow the detection of extended-spectrum β-lactamases. In Table VII the ATCC reference strain was incorrectly given as ATCC 25932; this should have read ATCC 25923. In Tables VII and VIII the ch…
The effects of specimen thickness, testing conditions and preparation technique on the measured ramp-breakdown strength of 2 polyethylene systems have been investigated. The obtained data have been found to be highly reproducible, enabling results under different test conditions to be correlated with one another. In a…
Diffraction peak profiles broaden due to the smallness of crystallites and the presence of lattice defects. Strain broadening of powders of polycrystalline materials is often anisotropic in terms of the hkl indices. This kind of strain anisotropy has been shown to be well interpreted assuming dislocations as one of th…
Syntheses and biodegradation of random copolymers of L-lactide (L-LA) with trimethylene carbonate (TMC), 1,1-dimethyltrimethylene carbonate (1,1-DTMC) and 2,2-dimethyltrimethylene carbonate (2,2-DTMC) were investigated at various monomer ratios using SmMe(C5Me5)2THF as an initiator at 80 °C for 24 h in toluene. Enzyma…
The structure of the cubic‐ZrO 2 symmetrical tilt Σ5 (310)/[001] grain boundary is examined using density functional theory within the local density and pseudopotential approximations. Several pristine stoichiometric grain‐boundary structures are investigated and compared with Z‐contrast scanning transmission electron…
Two pipeline steels of different grades were used to study the effect of cyclic loading prior to corrosion exposure upon the initiation of stress corrosion cracks in a near-neutral-pH soil environment. A cyclic loading scheme was constructed based on pressure fluctuation data collected on operating pipeline systems. T…
Abstract Regional differences in clay mineralogy are found in British Lower Palaeozoic slate belts formed during Caledonian terrane amalgamation. Extensional basins in Wales, the northern Lake District and the Isle of Man are characterized by a greater diversity of species in clay mineral assemblages. Slates that evol…
Abstract Composites based on isotactic polypropylene (PP) and sisal fiber (SF) were prepared by melt mixing and injection molding. The melt mixing characteristics, thermal properties, morphology, crystalline structure, and mechanical behavior of the PP/SF composites were systematically investigated. The results show t…
Abstract An attempt is made to reconcile observations and theories of cross-slip with recent models of cyclic plasticity and the fatigue endurance limit of crystals. According to this view, the stress required to separate two screw dislocations of opposite signs, which are just on the point of mutual annihilation by c…