Materials Literature
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Abstract Crystallization behavior of blends of poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) (PHBV) and poly(1,2‐propandiolcarbonate) (PR(CO 2 )) has been investigated by polarized light microscopy (PLM). The spherulite growth rates (SGR) of all blends were faster than that of pure PHBV, and the spherulite growth rates…
Abstract The use of boundary‐conforming finite element methods is considered for the solution of surface‐tension‐dominated free‐surface flow problems in three dimensions. This class of method is based upon the use of a moving mesh whose velocity is driven by the motion of the free surface, which is in turn determined…
The clay deposit of Caxambu Hill occurs in a NW/SE oriented graben originated by syntectonic sedimentation during Cenozoic. Four facies were identified (fragmentary, nodular, massive and friable) and their differentiation is related to gravity mass-flow processes. The fragmentary facies is composed of extraclast fragm…
Neste trabalho foi estudada a degradação de alguns dos principais constituintes dos rejeitos plásticos (polietileno de alta densidade (HDPE), polietileno de baixa densidade (LDPE) e polipropileno (PP)), empregando-se um catalisador exausto de unidades de craqueamento de fluidos (FCC) e um catalisador zeolítico (ADZ3)…
Abstract A review of the historical development, manufacture, properties and applications of solvent‐cast cellulose diacetate film.
The one-pot high temperature catalytic polycyclocondensation of diamines and dianhydrides in molten benzoic acid (BA) was studied. Due to specific features of molten BA as a solvent, obtaining new random and alternating copolyimides (CPIs) becomes possible. Several series of CPIs containing the moieties of different d…
Abstract Ultrafine alumina–silica powders with varying composition gradients within the particles have been produced by chemical vapor synthesis in a hot‐wall reactor using the precursors tetraethoxysilane (TEOS) and aluminiumtrisecbutylate (ASB). The surface chemistry at the particle/liquid interface in aqueous dispe…
Mixed ammonia-water vapor postsynthesis treatment provides a simple and convenient method for stabilizing mesostructured silica films. X-ray diffraction, transmission electron microscopy, nitrogen adsorption/desorption, and solid-state NMR (13C, 29Si) were applied to study the effects of mixed ammonia-water vapor at 9…
Charge carriers injected from the electrode and charge carriers generated in the bulk contribute space charge in low density polyethylene (LDPE). However, it is sometimes difficult to separate their contributions. In this paper, a fluorinated ethylene propylene copolymer (FEP) film was used as a blocking layer. It was…
Technical insulators are largely characterised by unipolar ionic flow. The carriers are supplied by injection, or by bulk ionisation, and the charge transport is space charge perturbed. Continuum equations have provided the basis for models of charge flow. First I show the validity of the Deutsch assumption in gases,…
The laboratory implementation of grazing incidence in-plane X-ray diffraction, using an unmodified commercial diffractometer, is described. Low resolution, high intensity measurements are illustrated in the study of the in-plane lattice parameters and texture of a thin polycrystalline ZnO film on glass, the in-plane o…
We investigated the effects of a chemically‐vapor‐deposited mullite coating (∼100 nm) on the oxidation resistance of sintered Si 3 N 4 in air and steam environments. The coating was sacrificially incorporated into the thermally grown oxide (TGO) on Si 3 N 4 during isothermal oxidation in air at 1400°C, leading to sign…
Swelling properties of chitosan-gelatin films cross-linked by sulfate were investigated. Sulfate cross-linked chitosan-gelatin films (SCG) were prepared simply by dipping chitosan-gelatin films into sodium sulfate solution. The swelling behavior of SCG was investigated as a function of pH and ionic strength. Under aci…
Time-resolved luminescence spectra of an exciton-exciton scattering process and an electron–hole plasma (EHP) were measured in ZnO epitaxial thin films by the optical Kerr gate method. At moderate excitation density below critical Mott density, stimulated emission of luminescence due to the exciton–exciton scattering…
EXPERIMENTS ON ALUMINUM TUBES WITH VARYING D/T RATIOS AND THEIR FINITE ELEMENT SIMULATION HAVE BEEN PERFORMED TO STUDY THEIR COLLAPSE MECHANISM AS WELL AS THE LOAD COMPRESSION AND THE ENERGY ABSORPTION RESPONSES. CONVERGENCE STUDIES WITH RESPECT TO MODEL PARAMETERS LIKE LOAD STEP SIZE, MESH DENSITY AND BOUNDARY CONDIT…
A utilização de proteínas sarcoplasmáticas junto de proteínas miofibrilares pode ser interessante na tecnologia de filmes comestíveis, pois eliminaria o processo de lavagem do músculo no preparo das proteínas. O objetivo deste trabalho foi estudar propriedades físicas de filmes constituídos de proteínas miofibrilares…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
In air-jet weft insertion, the weft yarn is moved by the frictional drag between the air stream and the yarn surface. This paper reports the computer simulation of this process in order to determine the motion of the yarn during weft insertion. Forces acting on the weft . depend on time as well as the varying position…
The paper presents alternative numerical techniques implemented in power transformer analysis and design focusing on the short circuit impedance evaluation. The proposed method adopts a particular reduced scalar potential formulation enabling a three-dimensional (3-D) magnetostatic problem solution. This method, requi…
Nickel oxide/zinc oxide structures were formed by evaporating Ni onto ZnO and annealing in oxygen. The electrical properties of this nickel oxide layer were investigated by four-point probe measurements and those of the nickel oxide/zinc oxide junction by variable temperature current-voltage (I-V) measurements. NiO la…