Materials Literature
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This paper describes the synthesis of polymer hybrids between polyoxazoline and silica gel, in which the transition metal salts are incorporated. Organic-inorganic polymer hybrids were prepared by the acid-catalyzed sol-gel reaction of tetraethoxysilane in the presence of poly (2-methyl-2-oxazoline). To this system we…
The material design program has been developed for the Nd-Fe-B sintered magnets. This method enables to estimate the phase volume percent and magnetic properties. This program has been applied for the development of (BH)max=45MGOe with iHc=13kOe magnet and high energy product magnet. From the design of (BH)max=45MGOe…
Behavior of F and O on the Si(100) surfaces dipped in aqueous solution of HF was examined by use of X-ray photoelectron spectroscopy (XPS). The F 1 s spectrum observed was separated into two Gaussian peaks with 685.6eV and 687.4eV binding energies, which are considered to correspond to Si-F and Si-F2 bonding respectiv…
Crystals of Eu-(Gly-Gly-Gly).(H2O)5.(ClO4)3 are triclinic, spacegroup P1 with a = 9.123 (2), b = 11.185 (5), c = 11.426 (2) A; alpha = 90.79 (2), beta = 98.08 (1), gamma = 98.57 (2) degrees; Z = 2. The europium cation is surrounded by four oxygens from three different peptide units and four oxygens from water molecule…
Partially oxidized rhodium metal showed remarkable and stable activity for the partial oxidation of methane into synthesis gas by oxygen species trasported through Rh/YSZ/Ag under 1 atm and at a low temperature of 773 K.
It is wellknown that 6.5% Si steel has excellent soft magnetic properties, but high Si steel more than 4% Si are so brittle that it is impossible to manufacture thin gauge steel sheets using the conventional rolling process.Using the siliconizing method, we have succeeded in developing the world's first non-oriented 6…
Landau theory predicts significant differences between the ordering transitions in hexagonal close packed (hcp) and face centered cubic (fcc), based on symmetry arguments alone, even though it is possible with pairwise first and second neighbor interaction energies to assign identical energies to corresponding tetrahe…
Effect of fluoride ions on the pitting behavior of type 304 stainless steel has been studied in neutral chloride solutions at 303K. It has been confirmed by means of potentiodynamic polarization measurements that fluoride ions inhibit the chloride ion-induced pitting corrosion and promote the uniform dissolution of th…
A fatigue cut growth evaluation for thermoplastic polyurethanes is pre sented. The results from an experimental design study that included four different polyol types, the effect of the molecular weight of the polyol and three different urethane contents are discussed. The polycarbonate polyol showed the lowest fatigu…
Computerized image analysis was used to obtain Fourier contour parameters and the fractal dimension of insulin zinc crystals (IZC). These methods are capable of characterizing and identifying small changes in the morphological and surface parameters of IZC with different crystal habits during dissolution. The Fourier…
Improved thermal stability of adhesion for an epoxy resin and a polyimide to copper has been achieved by pretreating the copper surface with polybenzimidazole solution. The adhesion strength for modified specimens was found to be twice of that for unmodified after aging at 250°C for 30 min. The coupling mechanism and…
Detailed two-dimensional plane strain analysis results for a reactor pressure vessel (RPV) with a shallow inner-surface axial flaw subject to a postulated pressurized thermal shock (PTS) transient are presented. The PTS transient simulates the pressure-fluid temperature history of an RPV in a pressurized water reactor…
The characteristics of rotary transformers can be successfully simulated by axisymmetric finite element analysis. Stator and rotor inductances, combinational inductances, leakage inductances, and coupling coefficients are calculated and compared with data measured from a commercial product. The calculated data are in…
Reaction of acetone oxime with [NBun4]4[α-Mo8O26] in refluxing methanol yielded [NBun4]2[Mo4O12(Me2CNO)2]1 while that with [MoO2(acac)2](acac = acetylacetonate) at room temperature resulted in the formation of [Mo4O10(OMe)4(Me2CNHO)2]2. The crystal structures of 1 and 2 have been determined [1, space group P, a= 9.009…
No presente estudo, foi avaliada a introdução de métodos de análises de micro-estrutura de fibras celulósicas. O algodão utilizado, proveniente das variedades IAC 17, IAC 19 e IAC 20, foi colhido em dez localidades do ensaio regional de variedades do Estado de São Paulo, no ano agrícola de 1985/86. Amostras de fibras…
The stress corrosion cracking (SCC) behavior of alloy 718 is known to be controlled by the microstructure of the material. By evaluating the SCC susceptibility of alloy 718 as a function of thermal treatment and by characterizing the microstructure produced during various thermal treatments, it has been possible to id…
The positive temperature coefficient of resistivity (PTCR) behavior of semiconductive BaTiO 3 is well explained by the Heywang model, which predicts the resistivity behavior above the Curie point based on the acceptor state density at the grain boundaries, the charge carrier density, and the energy gap, E s , between…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
The spectroscopic properties of octahedrally coordinated ${\mathrm{Ni}}^{2+}$ ions in ${\mathrm{Gd}}_{3}$${\mathrm{Ga}}_{5}$${\mathrm{O}}_{12}$ garnet are described with a five-parameter model in the framework of the adiabatic approximation. The effect of spin-orbit coupling on the vibronic potentials due to the fully…
Based on experience gained from processing samples from the Cenozoic basins of south-west Ecuador, a composite procedure for the processing of fossil diatoms from lithified or partially consolidated sediments is presented. The procedure is divided into four stages: (I) initial sample breakdown. (II) cemented rock brea…