Materials Literature
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A detailed finite-difference approximation of equations of the model for crystal pattern formation in a solidifying binary alloy is given. The stability of the numerical scheme obtained is investigated and the criterion of von Neumann for computing stability is defined. A solution of the finite-difference equations si…
The main tendencies in the formation of local magnetic moments and hyperfine magnetic fields at Fe nuclei in Fe-Sn and Fe-Si alloys at low metalloid concentrations are analyzed on the basis of “first-principles” calculations. The results of calculations are compared with experimental data. The main differences between…
Austenitic stainless steels are currently known to have irradiation-assisted stress corrosion cracking (IASCC) susceptibility when exposed to critical neutron irradiation in pure water environment at high temperatures. Since the radiation induced segregation (RIS) at grain boundaries (GBs) has been considered as a pre…
An extended and generalized Flory–Huggins model for calculating the heats of mixing and predicting the phase stability and spinodal diagrams of binary polymer–polymer mixtures is presented. In this model, the interaction parameter is considered to be a function of both temperature and composition. It is qualitatively…
Electrochemical impedance spectroscopy was used to assess the corrosion behavior of the weld zones and surface conditions of a laser-clad nickel aluminum bronze immersed in a 3.5% neutral saline solution. The zones and conditions examined included: (i) as-cast base material; (ii) laser-clad material with the high temp…
The thermal properties of blends of polycarbonate (PC) and poly(ε-caprolactone) (PCL) were investigated by differential scanning calorimetry (DSC). From the thermal analysis of PC-PCL blends, a single glass-transition temperature (Tg) was observed for all the blend compositions. These results indicate that there is mi…
We report magnetization and magnetoresistance studies of the geometrically frustrated spinel compound LiMn2O4 near its charge ordering temperature. The effect of a 7 T magnetic field is to very slightly shift the transition in the resistivity to lower temperatures resulting in large negative magnetoresistance with sig…
New delafossite-type CuInO2 was synthesized by ion exchange reaction of CuCl with α-NaFeO2-type NaInO2 or with α-LiFeO2-type LiInO2. According to the XRD, after 144 h the main product obtained at 623 K was CuInO2 in either starting material. Lattice parameters of CuInO2 derived from NaInO2 or LiInO2 as determined by R…
Both conjugated polymers and guest-host organic materials have been investigated as potential candidates for optical switching applications. The non-linear optical properties have been charactrized and their suitability compared with the standard switching criteria. Copyright © 2000 John Wiley & Sons, Ltd.
A guideline for a stable π-extended Wurster type redox system is proposed and two new acceptor molecules having a pyrene π-system were prepared and structurally characterised. 3,8-Bis(3′,5′-di-tert-butylphenyl)-13,13,14,14-tetracyano-1,6-pyrenoquinodimethane gave an electron transfer complex with Mn(TPP) (H2TPP = m-te…
The role played by sorbed water molecules present within poly(ethylene terephthalate) film at the moment of uniaxial drawing on the appearance and the percentage of the strain-induced crystalline (SIC) phase is investigated by birefringence, X-ray diffraction, and differential scanning calorimetry measurements. We sho…
The magnetic properties of Nd-Fe-B alloy magnet powders produced by the HDDR process were found to depend strongly on the hydrogen pressure. Anisotropic magnet powder is obtained by treatment at low hydrogen pressure, whereas isotropic magnet powder is obtained at high hydrogen pressure. Since the reaction rate is det…
Chiral-twisted iron(III) porphyrin dimers were self-assembled to high-molecular-weight polynuclear species through the intermolecular formation of μ-oxo dimers.
High temperature oxide melt solution calorimetry is a versatile technique for studying the energetics of formation, solid solution mixing, phase transition, and order/disorder in complex perovskites. The methodology is described and examples of both present and possible future applications given. The stability of the…
Yttrium niobate doped with Bi was prepared using a solid‐state reaction technique and its luminescence behavior was investigated under ultraviolet and low‐voltage electron excitations and with the first‐principle calculations. The optimization of the photo‐and cathodoluminescent properties was studied with control of…
The combustion of 0.32-cm-diameter pure iron rods in gaseous oxygen under normal and reduced gravity conditions has been investigated to determine whether the upward Regression Rate of the Melting Interface (RRMI) and other burning characteristics are affected by the type of igniter material (wire) used. The experimen…
Combined Scale Removal and Scale Inhibition Treatments P.S. Smith; P.S. Smith BP Amoco Search for other works by this author on: This Site Google Scholar C.C. Clement, Jr.; C.C. Clement, Jr. BP Amoco Search for other works by this author on: This Site Google Scholar A. Mendoza Rojas A. Mendoza Rojas Ecopetrol - Instit…
In the present article we review several postembedding cytochemical techniques using the colloidal gold marker. Owing to the high atomic number of gold, the colloidal gold particles are electron dense. They are spherical in shape and can be prepared in sizes from 1 to 25 nm, which renders this marker among the best fo…
A coalescence mechanism for the coarsening behavior of polymer blends during a quiescent annealing process is proposed, in which the effect of different particle sizes is taken into consideration. All existing forces, such as thermal agitation, van der Waals attraction, interfacial tension, and viscous resistance, con…
自然界で微生物によりH2OとCO2に完全に分解されるポリ-β-ヒドロキシ酪酸 (PHB) とポリカプロラクトン (PCL) をベースにして, 生分解性プラスチックスの開発を試みた. ダンベル型試験片およびシートの機械的性質の検討で, PHBの欠点である伸び率および衝撃強度, またPCLの欠点である弾性率はPHBにPCLを40～60% 混合することにより改善された. さらに, PHB, PCLおよびPHB/PCLの混合物について押出ブロー成形を行ったところ, PCLおよびPHB/PCLの混合物で成形ボトル (500L容) を得ることができた. これらの成形ボトルの酸素透過率は, PHBの混合割合が増加するに従い低下し, PHB/PC…