Materials Literature
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Shrimp and crab shells as well as other seafood industry residues contain chitin as a major component. Partly degraded (oligomeric) chitin is recognized as an elicitor of plant defense mechanisms and a growth suppressor of pathogenic fungi. A method of composting shrimp shells was developed with the objective of obtai…
Resíduos de borracha, provenientes de indústrias de calçados e de pneus, foram adicionados ao poliestireno visando tenacificá-lo. As misturas foram realizadas em extrusora dupla-rosca e a moldagem feita por compressão e por injeção. Os efeitos da concentração ( 5-25% em peso) e granulometria (1200 a 180mm) dos resíduo…
Abstract In cubic Y 2 O 3 (10–25 mol%) or CaO (14 and 17 mol%) stabilized ZrO 2 , oxygen vacancies are created as charge‐compensating defects. Mechanical loss (internal friction) measurements are performed on single crystals of cubic zirconia with various orientation at frequencies of f ≈︁ 1 Hz and 1 kHz, to study the…
The zero-field-cooled magnetization at the magnetic field H = 300 Oe shows anomolous kinks at TA and TB (>TA far below the reentrant spin-glass-like transition temperature Tf (above which a long-range ferrimagnetic ordering is set up). The irreversibility between the zero-field-cooled and the field-cooled magnetizatio…
A novel class of allyl compounds based on epoxy resins was synthesized and characterized. The synthesis of these allyl compounds was carried out by reacting corresponding epoxy resin with 2-allyl-4-methylphenol. The copolymers of 4,4′-bismaleimi-dodiphenyl methane with the allyl compounds were prepared and their prope…
The wetting behavior of single‐crystalline magnesia (MgO) by fayalite‐type slag melts has been studied by the sessile‐drop technique, which incorporates high‐temperature X‐ray radiography. The experiments have been performed under oxygen partial pressures of 106 and 104 Pa at a temperature of 1473 K. The mass ratios o…
Copper has been proposed as a possible replacement for aluminum as the primary microelectronics metallization material. As the feature sizes of ultralarge scale integration (ULSI) technologies reach sub-0.25 μm in dimension, new metallization processes must be developed to properly fill the extreme topographies. This…
ZnO thin films have been grown on glass substrates using the spray pyrolysis technique. The depositions were carried out in the range of substrate temperatures from 400 to 500 °C. Highly c-axis oriented ZnO films, having a strong (002) X-ray diffraction line, are obtained at lower temperatures (400 to 420 °C). Film su…
Anomalous dispersion of X-ray diffraction at wavelengths near the X-ray K-absorption edge of sulfur at wavelengths around 5 A has been applied to single crystals of trypsin obtained from an ammonium sulfate solution. The multiwavelength anomalous-dispersion method based on 775 unique reflections (+183 Bijvoet mates) m…
Small amounts of polytetrafluoroethylene (PTFE) are shown to modify the combustion behaviour of Acrylonitrile–Butadiene–Styrene terpolymers (ABS) fire retarded with a bromine/antimony synergistic system. PTFE makes ignition more difficult and decreases the rate of flame propagation in the early stage of combustion. Th…
(La,Sr)CoO3/Pb(Zr,Ti)O3/(La,Sr)CoO3 (LSCO) heterostructures have been grown on LaAlO3 substrates by pulsed laser deposition (PLD) to investigate asymmetric polarization switching of Pb(Zr,Ti)O3 (PZT) thin films with different electrode configuration. P-V hysteresis loop of LSCO/PZT/LSCO was symmetric. However, LaCoO3…
Abstract Starch, totally biodegradable polysaccharide biosynthesized by numerous plants, is one of the most abundant renewable resources known to man. Composed mostly from linear amylose and highly branched amylopectin, the starch, in its granular form, is a crystalline material. When mixed with limited amount of wate…
Abstract Crystallization and supramolecular aggregation of 1,4,7,10,13‐pentaoxacyclopentadecane‐2‐ylmethyl 3,4‐bis[4‐(dodecyl‐1‐oxy)benzyloxy]‐5‐(11‐methacryloyloxyundecyl‐1‐oxy)benzoate ( 1 ) and its complexes with sodium triflate are described in solutions of the methacrylate monomers. Formation of a gel was observe…
Abstract The influence of structural recovery or physical aging on the craze initiation of amorphous polystyrene and a styrene‐acrylonitrile copolymer has been examined in two states of stress/deformation and at different temperatures. Studies of craze initiation in equibiaxial creep were performed using a “bubble” in…
Abstract The titled new salts were synthesized by exchanging the unknown counter anion of [Sb(pc)Cl2]+ salt (pc2− = phthalocyaninate, C32H16N82−), which was the first product of the reaction of phthalonitrile with antimony(III) trichloride, with perchlorate, tetrafluoroborate, and hexafluorophosphate. Elemental analyt…
Abstract There is a growing demand for rigid vinyl foam as a wood replacement in window frames, blinds, trimming and other applications. While rigid vinyl foam has existed for many years, additional understanding of its processability and required conditions for good quality extruded profile would be helpful. This pap…
In this paper we propose a fitting procedure to describe the bandpass effect on all x radiation that passes through a focusing graphite monochromator used on the diffracted beam. The proposed bandpass function is: M (2θ)=1/(1+ K mon 1 s K mon 2 ), with s =(2 sin θ)/λ, where K mon 1 and K mon 2 are constants which have…
Electrical resistance measurements and x-ray-diffraction experiments have been carried out under high pressure for \ensuremath{\alpha}-monoclinic and amorphous and trigonal Se. \ensuremath{\alpha}-monoclinic Se showed a transition to the metallic state at 12 GPa, which was considerably lower than 23 GPa of trigonal Se…
Expansion of a mesh skin graft depends on factors pertaining to the graft itself as well as on parameters of the meshing device. With regard to the graft, we examine the efficiency of graft handling and thickness of the skin graft. With regard to the parameters of the meshing apparatus, which determine the expansion r…
The intensity of Raman modes of four different silicate garnets in the energy range 1.9–2.7 eV was investigated. In the case of almandine (Fe3Al2Si3O12) and pyrope (Mg3Al2Si3O12) no change in intensities was observed in this energy region and in uvarovite (Ca3Cr2Si3O12) a weak resonance maximum was observed between 2.…