Materials Literature
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Coupons of stainless steel type AISI-304 were exposed to the industrial cooling system of a petrochemical plant fed by seawater from the Guanabara Bay, Rio de Janeiro, Brazil, in order to study the in situ formation of biofilms. Bacteria, microalgae and fungi were detected on the coupons as soon as 48 h after exposure…
Electrodeposition of ion resulted in the growth of single‐crystal particles on an amorphous carbon electrode in solution. single crystals grow at potentials higher than −0.55 V vs. saturated calomel electrode (SCE) in (pH 7) as well as (pH 2.0) and HCl (pH 2.1) solutions. However, as well as Cu particles are formed si…
High resolution ac calorimetric measurements have been carried out for two liquid-crystal systems: 4-(1-methylheptyloxycarbonyl) phenyl 4\ensuremath{'}-octyloxybiphenyl-4-carboxylate (MHPOBC), and 2-fluoro-4-{[(1-trifluoromethyl) undecyloxy] carbonyl} phenyl 4\ensuremath{'}-(dodecyloxy) biphenyl-4-carboxylate (12BIMF1…
Tilting of the crystal profile during directional solidification is studied numerically, when the crystalline axis is misoriented from the temperature gradient and the pulling direction. Only with the anisotropy in surface stiffness is the crystal shown to tilt to an angle \ensuremath{\varphi} smaller than the misorie…
A group theoretical analysis, based on the correlation method, is presented for the symmetric stretch vibration of the carbonate ion in three crystalline forms of calcium carbonate: calcite, aragonite and vaterite. Numbers of Raman and infrared active components are calculated and compared with experimental data, incl…
Contaminant effects on the morphology of turkey egg-white lysozyme (TEWL) crystals grown in ungelled and in gelled growth media have been investigated. The latter may serve as a model system for future microgravity experiments. Hen egg-white lysozyme (HEWL) was added as the contaminant at levels ranging from 4 up to 7…
L-Lactate monooxygenase (LMO) from Mycobacterium smegmatis was mutated at glycine 99 to alanine, and the properties of the resulting mutant (referred to as G99A) were studied. Mutant G99A of LMO was designed to test the postulate that the smaller glycine residue in the vicinity of the alpha-carbon methyl group of lact…
Abstract The Pb 2+ luminescence in a series of silicate oxyapatites Me 2 (Y, Gd) 8 (SiO 4 ) 6 O 2 , Me 4 Y 6 (SiO 4 ) 6 O(Me = Mg, Ca, Sr) is reported and discussed in relation to the crystal structure. The maximum wavelengths of the excitation ( 1 S 0 3 P 1 ) and emission ( 3 P 1 − 1 S 0 ) bands of Pb 2+ are independ…
The gene encoding the tetrameric malate dehydrogenase (MDH) in a thermophilic Bacillus species (BI) has been cloned in an Escherichia coli plasmid. The nucleotide sequence of the gene, the first to be elucidated for a tetrameric MDH, shows the MDH subunit to contain 312 amino acids and have a molecular mass of 33648 D…
We use only nitrogen as the reaction gas to deposit on the cleaned Si wafer an extra-thin Si nitride film (∼40 Å) by electron cyclotron resonance method. Electroluminescence (EL) with its peak wavelength at about 7000 Å from the semitransparent Au/extra-thin Si nitride film/p-Si structure has been detected. The effect…
The biomedical study of NiTi shape memory alloys has been undertaken in China since 1978. A series of stimulating corrosion tests, histological observations, toxicity tests, carcinogenicity tests, trace nickel elements analysis and a number of clinical trials have been conducted. The results showed that the NiTi shape…
We study the relaxational dynamics of the one-spin facilitated Ising model introduced by Fredrickson and Andersen. We show the existence of a critical time which separates an initial regime in which the relaxation is exponentially fast and aging is absent from a regime in which relaxation becomes slow and aging effect…
Pb 0.91 La 0.06 (Zr 0.65 Ti 0.35 )O 3 (PLZT 6/65/35) is a relaxor ferroelectric near and above the temperature of the dielectric maximum (∼180°C). The relaxor state can persist to room temperature upon fast cooling. However, this relaxor state gradually changes to a normal ferroelectric over a long time period at 25°C…
The main electrochemical characteristics of a new aluminum vanadium oxide synthesized via a sol‐gel process are reported. The kinetics of the electrochemical insertion of lithium into has been investigated using ac impedance spectroscopy and the pulse relaxation technique. These two methods, which involve basically di…
Films of Sn oxide and oxyfluoride were made by reactive rf magnetron sputtering onto ITO-coated glass. We analyzed the composition by Rutherford backscattering spectrometry, the structure by x-ray diffraction, and the surface topography by atomic force microscopy. Li intercalation from a liquid electrolyte was more fa…
A Ni8 cube, assembled with twelve bridging μ-violurato ligands, is present in 1 (H3vi = violuric acid). The oximate groups of the ligands lie along the edges of the cube, connecting the metal ions in an unprecedented trans conformation (see picture, • Ni) and mediating a strong antiferromagnetic coupling between the…
Dielectric permittivity studies of Na0.5Bi0.5TiO3 single crystals in a broad range of frequency up to 10 MHz and temperature 300—823 K are reported. In this temperature range dielectric dispersion below 1 MHz has been found. The obtained data were fitted to the Cole-Cole relation. The mean relaxation time τ is strongl…
A monomer with reactive double bonds was mixed with a liquid crystal and polymerized under UV irradiation in various phases of the liquid crystal. The polymer networks formed are found to be anisotropic and fiber-like, if the monomer is polymerized in an oriented liquid crystal state. The orientational order of the po…
Quantum paraelectrics are incipient ferroelectrics whose transition is hindered by the zero-point quantum motion. Recently however, electronparamagnetic-resonance measurements uncovered a phase-transition-like anomaly in the quantum paraelectric SrTiO3 at T q ≈ 37 K. The observed line shifts are accompanied by no meas…
We have studied the effects of suction air pressure on the structural parameters and mechanical properties of yarn. Changing the amount of suction air pressure improves the fiber extent in yam and yarn appearance. Therefore, photographic and fiber tracing methods are used to evaluate, respectively, yam appearance and…