Materials Literature
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Abstract Models for the crystal structure of cis ‐1,4‐poly(2,3‐dimethyl‐1,3‐butadiene) are elucidated by the joint use of molecular mechanics and WAXS. The chain conformation can be predicted by using different sets of potential functions. A model of crystal structure calculated by molecular mechanics has been refined…
This paper reviews methods available for mapping the distribution of fluid in incontinence pad materials to assist with evaluating existing products and developing new ones, and to provide data for building and validating predictive models. Specifically, the following technologies are considered and their strengths an…
The effect of unidirectional propagation of surface electromagnetic waves on the interface between an isotropic Faraday medium and isotropic optically inactive medium is predicted. Such waves can be excited when the intensity of an external magnetic field exceeds a certain threshold. Solutions to the dispersion relati…
Abstract Positively charged tetra(4‐N,N,N,N‐ trimethylanilinium) porphyrin (TAP) and negatively charged tetrakis(4‐sulphonatophenyl) porphyrin (TPPS 4 ) and their mixtures with dopa melanin in polyvinyl alcohol have been investigated. On the basis of the absorption and fluorescence spectra it has been established the…
Abstract The main problem in post‐consumer plastics recycling is due to the thermomechanical stress acting on the melt during the reprocessing operations. The macromolecules break because of the temperature and of the mechanical stress. The extent of degradation is then correlated to the level of mechanical stress whi…
The QUENCH06 test at Forschungszentrum Karlsruhe (FZK) selected to be the international standard problem (ISP) No. 45 by OECD/NEA has been analyzed by the IMPACT/SAMPSON code, a detailed analysis code for severe accidents in an LWR. The code has been used to perform blind and open phase analyses of the quench phenomen…
Propriedades termofísicas, difusividade térmica e calor específico, de soluções modelo similares a sucos, foram determinadas experimentalmente e ajustadas a modelos matemáticos (STATISTICA 6.0), em função da sua composição química. Para definição das soluções modelo foi realizado um planejamento estrela mantendo-se fi…
T em per at ure dependen ces ( 4{ 300 K ) of t he electron spin-lattice rela xation ha ve b een determined by electron spin echo techni que for free radicals in tw o polymeric systems : phenol-formald ehyde resin and p olyhydra zodi sulphide . T he dep endences are describ ed in terms of dynamics specic for amorphous…
Typical magnetically functionalized Al2O3/Ni nanocomposite materials were fabricated by pulse electric current sintering process. The rapid densification and various microstructures were accomplished with controlling PECS temperature. The PECSed Al2O3/Ni system exhibited peculiar mechanical and magnetic properties wit…
Abstract Solid materials contain impurities from manufacturing/cleaning processes which diffuse (out‐gas) to the exterior during exposure to vacuum, especially at elevated temperature levels. Materials like plastics and resins tend to disintegrate under space conditions. In addition to the above mentioned diffusion pr…
Inherent difficulties in growing protein crystals are major concerns within structural biology and particularly in structural proteomics. Here, we describe a novel approach of engineering target proteins by surface mutagenesis to increase the odds of crystallizing the molecules. To this end, we have exploited our rece…
In this article we present a formulation to account for the effect of cell size distribution on the mechanical behavior of foams. The present approach averages the response of unit cells with different sizes via a Taylor averaging approach. This technique can be applied to different unit cell models where the cell siz…
The importance of aluminum nitride (AlN) stems from its application in microelectronics as a substrate material due to high thermal conductivity, high electrical resistance, mechanical strength and hardness, thermal durability, and chemical stability. Yttria (Y 2 O 3 ) is the best additive for AlN sintering. AlN densi…
The superplastic properties and microstructure evolution of a 0.15%Zr and 0.7%Cu modified 6061 aluminium alloy were examined in tension at temperatures ranging from 475 to 600°C and strain rates ranging from 7 × 10-6 to 2.8 × 10-2 s-1. The refined microstructure with an average grain size of about 11 μm was produced i…
Abstract The intercalation of a saponite with the Al polycation [Al 13 (OH) 24 (H 2 O) 24 ] 15+ is described. This polycation is obtained by reaction of alumina with Al chloride. The intercalation is achieved by reaction of very concentrated solutions of this polycation with the clay in powder form. Solids with a basa…
Propagation of ultrasonic signals induced by nanosecond laser pulses in porous silicon ( por -Si) is considered from both the theoretical and the experimental viewpoints. The experimental samples are por -Si layers with 5-to 40-µm thickness and porosity of 50–75%; these layers were formed on a single-crystal silicon s…
A Sr-exchanged heulandite crystal of composition Sr 4.35 Ca 0.13 (Al 8.96 Si 27.04 O 72 )·26H 2 O was used for stepwise dehydration experiments. The crystal was heated for approximately 12 h from room temperature to 250 °C in steps of 50 °C using an airflow-heater device. For single-crystal X-ray data collection the c…
Single crystals of the nitridosilicate Ca 0.27 La 0.03 Si 11.38 Al 0.62 N 16 with a filled α‐Si 3 N 4 ‐type structure were obtained when preparing lanthanum nitridosilicates in a graphite furnace accidentally containing calcium residues. The lithium α‐SiAlON LiSi 9 Al 3 O 2 N 14 was prepared using spark plasma sinteri…
Abstract New copolyether sulfones having copper(II) chelate units as pendant groups were synthesized by a chemical modification reaction of chloromethylated polysulfones with the sodium salt of copper(II) bis(2,4‐dihydroxybenzaldehyde) in dichloromethane/dimethyl sulfoxide as solvent system, at room temperature. The r…
Abstract In monotectic systems, there are thermodynamic restrictions on compositions and temperatures below the monotectic where the equilibrium solid cannot form directly from the undercooled homogeneous liquid. In this region, the solid can form only after liquid–liquid phase separation has occurred. As suggested by…