Materials Literature
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This paper describes the effect of fungi on the integrity of posttensioned tendons with respect to the occurrence of stress corrosion cracking (SCC). The occurrence of SCC is interpreted in terms of organic acids produced by fungal metabolic activity.
A new concept of a composite dielectric thin film fabrication is presented. The fabrication process consists of two stages. The first stage is anodizing a thin aluminum film to produce a porous alumina film that contains an array of nanometer sized parallel pores. The second stage is filling the pores with a saturated…
Abstract New copper(II) complexes with 8-hydroxyquinoline-2-carbaldehyde-N-methylnitrone (HL 1 ) (1) and pyridine-2-carbaldehyde-N-methylnitrone (L 2 ) (2) have been synthesized. The crystal structure of compound 1 consists of binuclear molecules Cu 2 (L 1 ) 2 (NO 3 ) 2 with the oxygen atoms of the hydroxy groups acti…
As models of ion channel proteins and naturally occurring pore-forming peptides, we designed a series of Aib rich peptides [Ac-(Aib-Xxx-Aib-Ala)(5)-NH(2) (Xxx = Lys, Glu, Ser, and Gly: BXBA-20)] to investigate the effects of the side chains of the amino acid residues Lys, Glu, Ser, and Gly on the conformation and elec…
On the basis of dielectric investigations of (NH3C2H5)2CuCl4 crystals the existence of phase transitions at T1 = 364 K and T2 = 356 K (in a heating run) was confirmed. In the temperature region of 300–370 K Debye relaxation was observed. The change of the dielectric dispersion character around T3 = 330 K is related to…
Dielectric and ferroelectric properties in systems of permanent and induced dipoles are calculated with a Monte Carlo method, the importance-sampling method. The systems are dipole chains and dipole planes, which can be looked at as subsystems of a perovskite structure. Depending on the system and the parameters we fi…
A influência dos materiais de origem, rochas do Pré-Cambriano e sedimentos coluviais e aluvionares delas derivados, e da posição topográfica na gênese de solos foi estudada em uma toposseqüência representativa das feições geomorfológicas da Baixada Litorânea Fluminense (RJ), no campus da Universidade Federal Rural do…
Interaction of CO 2 , Nd:YAG, excimer and high-power diode laser (HPDL) radiation with the surface of the biomaterial polyethylene (PE), was found to effect varying degrees of change to the wettability characteristics of the material depending upon the laser used. It was observed that interaction with CO 2 , Nd:YAG an…
A comparative study of slow crack propagation in alumina, zirconia and zirconia toughened alumina (ZTA) ceramics is presented keeping in mind the option that ZTA materials offer to improve the lifetime and reliability of ceramic joint prostheses. Different ZTA composites, using either unstabilized or yttria stabilized…
Abstract The Raman spectrum of holmquistite, a Li-containing orthorhombic amphibole from Bessemer City, USA has been measured. The OH-stretching region is characterized by bands at 3661, 3646, 3634 and 3614 cm −1 assigned to 3 Mg–OH, 2 Mg + Fe2+ –OH, Mg + 2Fe 2+ –OH and 3 Fe 2+ –OH, respectively. These Mg and Fe 2+ ca…
Abstract A new optical oxygen sensor based on the luminescence intensity change of a terbium(III) complex, tris(acethylacetonato)(1,10-phenanthroline)terbium(III) complex, ([Tb(acac)3(phen)]), adsorbed thin film onto an alumina plate, was developed. The luminescence peak positions of [Tb(acac)3(phen)] film were observ…
Phosphorus, Mn, or Si solid solution strengthened sheet steels stabilised with Ti and Nb are known to have poor galvanising and galvannealing properties. When these steels are continuously annealed in higher dewpoint atmospheres, selective oxidation processes can occur in the subsurface region of the sheet. A laborato…
The cluster formations in solid–liquid interface boundary layers of KDP crystals have been studied by Raman spectroscopy and ab initio cluster calculations with the density-functional theory. The calculations are made on H2PO4, H4P2O8, and H4P4O16 clusters, which model the cluster structure in different growth layers.…
The electrochemical polarization effect on early adsorption of Flavobacterium breve and Pseudomonas fluorescens P17 to platinum, titanium, stainless steel, copper, aluminum alloy and mild steel was studied. A well‐defined peak characterized the bacterial adsorption dependence on externally applied potential. Maximal a…
The development of the Discontinuous lsoperibolic Thermal Analysis (AITA) aims at setting up a new phase diagram investigation technique efficient in the case of organic component systems. A heterogeneous system (with at least one liquid phase) is kept in isoperibolic conditions and submitted to discontinuous composit…
Soluções sólidas de céria-gadolínia foram preparadas pela técnica de complexação de cátions utilizando o ácido cítrico como agente complexante. Os principais objetivos foram avaliar as condições ideais de calcinação para a obtenção de pós nanométricos com elevada sinterabilidade, e verificar o efeito do teor de dopant…
Much effort has been expended in the past few decades in the attempt to link the degradation of materials exposed to the atmosphere to the causative agents responsible for the degradation. The utility in doing so is primarily to understand the cause and effect relationships involved in the atmospheric corrosion proces…
The risk of decompression sickness (DCS) was modulated by varying the biochemical activity used to eliminate some of the hydrogen (H(2)) stored in the tissues of pigs (19.4 +/- 0.2 kg) during hyperbaric exposures to H(2). Treated pigs (n = 16) received intestinal injections of Methanobrevibacter smithii, a microbe tha…
The crystal structure of xilingolite, ideally Pb3Bi2S6, space group C 2/ m , Z = 4, a 13.511(3), b 4.0850(11), c 20.649(2) A, β 92.15(2)°, was solved and refined from single-crystal X-ray data collected on (001) twinned crystals ( R 1 = 8.65% for 1520 reflections with I > 2σI). Xilingolite is a 4,4 L homologue of the…
The thermal and kinetic aspects of solid state decomposition reactions can be complex and posses a large number of parameters to investigate. The determination of the activation energies for the several intermediates in the thermal decomposition is particularly sensitive to the overlap in thermal decomposition traces.…