Materials Literature
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Des exprériences de calorimétrie haute résolution ont été réalisées pour déterminer les chaleurs spécifiques et les chaleurs latentes associées aux transitions de phase des homologues de la série crystal liquide nF2BTFO1M7: 3-fluoro-4[1-methyl-heptyloxy]4'-($4''$-alcoxy-$2'',$ $3''$-difluorobenzoyloxy)tolanes. Ces pro…
The objective of the present work was study of the behavior of active coatings of hydrophilic acrylic polymers bearing salicylic acid residues linked covalently to the macromolecular chains, after their application to woven and knitted Dacron vascular grafts. In vitro tests were carried out under dynamic flow conditio…
The dispersion of stress waves in pressure bars distorts a propagating stress pulse, and hence limits the accuracy with which dynamic stress can be measured. This dispersion is caused by a frequency dependence of phase velocity, and previous methods of dispersion correction have adjusted the phase shift of dispersed f…
Abstract The metal complexes ( E,E )‐[{diethyl 2,2′‐[1,2‐phenylenebis(iminomethylidyne)]bis[3‐oxobutanoato]}(2–)‐ N,N′,O 3 ,O 3′ ]manganese (Mn 1a ), [3,3′]‐[1,2‐phenylenebis(iminomethylidyne)bis(2,4‐pentanedionato)(2–)‐ N,N′,O 2 ,O 2′ ]manganese (Mn 1b ), and (Z,Z)‐[diethyl 3,3′‐(1,2‐phenylenediimino)bis(2‐cyano‐2‐pr…
The effect of stable crack extension on fracture toughness test results was determined using single‐edge precracked beam specimens. Crack growth stability was examined theoretically for bars loaded in three‐point bending under displacement control. The calculations took into account the stiffness of both the specimen…
It is possible to design normal-incidence antireflection coatings that reduce the reflectance of any substrate with a refractive index that lies in the range of 1.48 to 1.75. The performance of such coatings depends on the width of the spectral region over which the reflectance is to be suppressed, on the coating mate…
We have determined the entire nucleotide sequence of a 4.4 kbp fragment of pMOP, a plasmid involved in 4-methylphthalate catabolism in Burkholderia cepacia (formerly Pseudomonas cepacia) Pc701. Two complete ORFs were identified and termed mopA and mopB. mopB encodes a 4-methylphthalate permease which is a member of a…
Abstract Chromophric receptors for nucleosides were designed utilizing the boronic acid–diol interaction which effectively operates in aqueous solution. Receptors consist of a boronic acid moiety and a dimethylaminophenylazo moiety. The boronic acid moiety forms a covalently-bonded ester linkage with the 2,3-diol grou…
Abstract Es wird über die beiden Orthothioborate Li 3 BS 3 (Pnma; a = 8,144(1) Å, b = 10,063(2) Å, 6,161(1) Å; Z = 4) und LiSrBS 3 (Pnma; a = 7,557(1) Å, b = 9,083(2) Å, c = 7,049(1) Å; Z = 4) berichtet. Die beiden neuen Phasen wurden durch Hochtemperatur‐Schmelzreaktion aus den Metallsulfiden, amorphem Bor und Schwef…
Al–Ni–Co stable decagonal quasicrystals had been believed to belong to P105/mmc and to have decagonal symmetry of the basic atom-cluster column when projected along the decagonal axis. The space group and the projection symmetry of the cluster columns of Al70Ni30-xCox (x = 15 or 20) quasicrystals were re-examined by c…
The effect of elevated deformation temperatures on microstructural parameters in fatigued nickel single crystals has been studied by transmission electron microscopy. The height and length of edge dipoles and the mean dislocation density in the matrix bundles have been measured as functions of temperature using weak-b…
Poly[(oligoethylene oxide) ethoxysilane)] (I) and poly[(oligoethylene oxide) ethoxysilane)]/(EuCl3)0.67 (II) were synthesized by reacting tetraethoxysilane with oligo(ethylene glycol) of molecular weight 400 and oligo(ethylene glycol)400/(EuCl3)0.317, respectively. The products so obtained are very transparent and rub…
Abstract Unlike previous attempts, the entire cycle of melting‐ and crystallization‐induced reordering is realized in binary polymer blends in the following order: two homopolymers → block copolymer → random copolymer → block copolymer. Blends of poly(ethylene terephthalate) Systematic IUPAC name: poly(oxyethyleneoxyt…
A pyrolysis gas chromatography (Py-GC) method has been developed to study the composition and microstructure of styrene/methyl methacrylate (STY/MMA) copolymers. The composition was quantified by Py-GC using monomer peak intensity. Because of the poor stability of methyl methacrylate oligomers, neither MMA dimer nor M…
The sol - gel process provides a method to blend, down to the molecular scale, organic and inorganic components which can be mixed in virtually any ratio to obtain the desired properties. These hybrid nanocomposites are extremely versatile in their composition, processing and optical and mechanical properties. Hybrid…
Abstract A mathematical model for the polymerization of ethylene using silica‐supported chromium catalysts is presented. The fundamentals for the physical and chemical representation of the phenomenon are detailed. The emerging mathematical problem is attached and solved using a multiple moving‐boundary numerical sche…
Abstract The formation of ordered patterns of nanosize polystyrene aggregates was observed by atomic force scopy. The samples were prepared by simply rinsing a mica surface with a dilute polymer solution in benzene.
The products of vaporization of boron/carbon mixtures around 3000 K were trapped in argon matrices at 10 K and their Fourier transform infrared spectra were measured. Analysis of the spectra combined with the predictions of density functional theory (DFT) calculations have resulted in the assignment of a previously ob…
Abstract Pd/Ni bimetallic clusters have been successfully prepared for the first time by a polyol reduction method, in which a mixed solution of Pd and Ni salts were reduced at high temperature by ethylene glycol. The bimetallic clusters are proved by TEM, XRD and preliminary EXAFS analysis to have an alloy structure.…
Type XI collagen is mainly found as a minor constituent in type II-containing fibrils and presents a alpha1(XI)alpha2(XI)alpha3(XI) stoichiometry. This molecule was shown to be partially processed in its intact tissue form. Moreover, alternative splicing has been demonstrated in the variable region of the N-terminal d…