Materials Literature
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This paper describes the hydrolytic degradation of three stereoregular poly(ester amides) which were obtained by polycondensation reaction of 1-amino-1-deoxy-2,3,4-tri- O -methyl-5- O -[(pentachlorophenoxy)succinyl]- l -arabinitol, 1-amino-1-deoxy-2,3,4-tri- O -methyl-5- O -[(pentachlorophenoxy)glutaryl]- l -arabinito…
A linear electrooptic coefficient of 0.3 pm/V is induced in a germanosilicate fiber by thermal/electric-field poling. Reducing the fiber thickness by simple mechanical polishing following the poling, leads to a half-wave drive voltage of only 75 V for a 12-cm active length with no measurable linear optical loss in the…
Constitutive equations for the superplastic behaviour of titanium and aluminium aerospace alloys have been presented and computational procedures developed for the determination of the material parameters arising in the equations. The equations include a description of grain growth kinetics with deformation enabling t…
We use the variational cluster approximation to study the relative thermodynamic stability of the spatially uniform phases of binary mixtures of hard rods and discs. The factors promoting the stability of the biaxial nematic phase are identified and discussed. The results suggest that a stable thermotropic nematic bia…
The high pressure d.c. sputtering method has been used to fabricate (YBa/sub 2/Cu/sub 3/O/sub 7//Nd/sub 0.67/Sr/sub 0.33/MnO/sub 3-y/)//sub n/ [(YBCO/NSMO)/sub n/] superlattices. X-ray analyses show c-axis epitaxial growth on LaAlO/sub 3/ (100) substrates. Nd/sub 0.67/Sr/sub 0.33/MnO/sub 3-y/ films are strained due to…
“Classical” superplasticity of SiAlON ceramics with the nominal composition (Y x Li y ) 0.6/(3 x + y ) Si 8.9 Al 3.1 O 2.5 N 13.5 is reported in this study. During deformation, these materials exhibit little microstructural evolution, with negligible growth of elongated β′‐phase grains and minimal texture formation. E…
A study on the effective thermomechanical response of a composite laminate with shape memory alloy (SMA) layers based on the implementation of the layerwise laminate theory in the finite element method is carried out in this paper. The SMA thermomechanical constitutive response is based on a thermomechanical model rec…
Enzymatic oxidative polymerization of p-alkylphenols using horseradish peroxidase as catalyst has been carried out in two polymerization solvent systems: a mixture of phosphate buffer (pH 7) and 1,4-dioxane, and a reverse micellar solution, yielding powdery polymeric materials. The polymer yield was much dependent upo…
Materials such as Terfenol-D that are capable of giant magnetostriction are increasingly being used for sensing and actuation in active and adaptive structures. Designers of such adaptive structures need robust analytical and modeling tools for solving coupled electro-magneto - mechanical boundary value problems. Whil…
Significant advances have been made over the past decade in using computer simulation to investigate the mechanisms associated with defect production by displacement cascades in metals. As reported at COSIRES '92 by Diaz de la Rubia et al. (Rad. Eff. and Def. Sol. 130–131 (1994) 39) and COSIRES '94 by Bacon et al. (Nu…
The leuB gene from the psychrotrophic strain Vibrio sp. I5 has been cloned and sequenced. The gene codes for 3-isopropylmalate dehydrogenase, a 360-residue, dimeric enzyme involved in the biosynthesis of leucine. Three recently solved homologous isopropylmalate dehydrogenase (IPMDH) crystal structures from thermophili…
Abstracts Systematics and description of polyions of both linked cation- and anion-centered polyhedra with face-, edge-, and corner-sharing are discussed. Some additions to the system introduced by Liebau (1985) for cation-centered polyions are proposed which take into account the property of linking. The concept of l…
The binding of three different amphiphiles (with different hydrophobic characters) to oppositely charged polyelectrolytes (κ-carrageenan, dextran sulphate, alginate, and hyaluronan) is investigated. It is shown that the degree of binding is related not only to the hydrophobicity of the amphiphile and to the charge den…
(Alkylsulfonyl)methyl-substituted poly(oxyalkylene)s were synthesized in two steps. (Alkylthio)methyl-substituted poly(oxyalkylene)s were made by the reaction of poly[oxy(chloromethyl)ethylene] (CE), poly[oxy(chloromethyl)ethylene -co- oxyethylene] (CEE), or poly[oxy-2,2-bis(chloromethyl)trimethylene] (BCT) with sodiu…
The growth of a supercritical nucleus from a diffusion field is studied numerically using a phase-field model. This represents growth of a crystal with small or vanishing anisotropy. We find three-dimensional cooperating multiplets instead of dendrites, in analogy to the doublons found previously in two dimensions. Tr…
A series of fluoro-substituted phenylthiophene monomers has been synthesized with high isolated yields (71–90%). Generalized coupling reactions have been developed for the series with a Pd(dppf)Cl2 catalyst and via Zn-complex mediated reactions. The controlled electropolymerization of monomers yielded polymeric materi…
Abstract : This report documents the numerical algorithms used in an explicit Lagrangian finite element hydrocode. One, two, and three dimensional implementations of the numerical solution of the conservation equations are covered. Triangular and tetrahedral continuum elements and shell elements are described. SPH (Sm…
The reaction of Au with a molten mixture of A 2 Q/P 2 Q 5 /Q (Q = S, Se) produced the quaternary compounds A 3 AuP 2 Se 8 (A = K, Rb, Cs) ( I − III ), A 2 Au 2 P 2 Se 6 (A = K, Rb) ( IV, V ), A 2 AuPS 4 (A = K, Rb, Cs) ( VI − VIII ), and AAuP 2 S 7 (A = K, Rb) ( IX, X ). I − III crystallize in the acentric space group…
The effect of oxide crystallinity on the oxidation rate of silicon carbide was investigated. CVD SiC coupons were oxidized in a clean TGA reactor system at 1300°C initially in flowing oxygen, immediately annealed in argon, and then reoxidized, all in situ and without cooling (so as to preserve oxide integrity). The pa…
(1997). BRIDGED POLYCYCLIC AROMATIC HYDROCARBONS. A REVIEW. Organic Preparations and Procedures International: Vol. 29, No. 3, pp. 243-283.