Materials Literature
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New or redefined printed symbols are proposed in the light of the recently accepted redefinition of symmetry elements [de Wolff et al. (1989). Acta Cryst. A45, 494–499]. In particular, the letter e covers certain glide planes which hitherto had no unique symbol, such as those called 'either a or b'. The use of e in th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn unexpected chiral spiro tetramer offers mechanistic insight into an improved sodium cyanide initiated polymerization of n-hexyl isocyanate in tolueneYoshio Okamoto, Yoshikazu Nagamura, Koichi Hatada, Chetan Khatri, and Mark M. GreenCite this: Macromolecules 1992, 25, 20,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Fatty Acid Esters and Hydroxy Ketones from Fruits of Laurus nobilisS. N. Garg, M. S. Siddiqui, and S. K. AgarwalCite this: J. Nat. Prod. 1992, 55, 9, 1315–1319Publication Date (Print):September 1, 1992Publication History Published online1 July 2004Published inissue 1 Sep…
The minerals constituting the wodfinite group are isostructural oxides, with the general formula ABC20s (Z = 4); A = Mn2+, Fe2+, Li, Q B = Sn +, Ti, Fe3+, Ta; C = Ta, Nb. A classification system based on the chemistry of the A-and B-cation sites has been devised; it uses chemical modifiers in conjunction with the root…
Abstract The crystal structure of klyuchevskite, K 3 Cu 3 (Fe,Al)O 2 (SO 4 ) 4 , was determined in space group I2 using the total of 715 independent reflections up to R 0.12. Klyuchevskite is a structural analogue of piypite (caratiite) K 4 Cu 4 O 2 (SO 4 ) 4 MeCl with the substitution K + + Cu 2+ → (Fe 3+ ,Al) + MeCl…
Oriented thin films of barium hexaferrite, BaFe/sub 12/O/sub 19/, were grown in situ on (0001) sapphire substrates utilizing a pulsed laser deposition technique. X-ray diffraction, elastic backscattering spectrometry, ferrimagnetic resonance, and vibrating sample magnetometry confirm that the structure, composition, a…
Abstract Quasiharmonic equations are derived for stress‐induced vibrational frequency shifts in the infrared and Raman spectra of polymer chains subjected to a tensile stress. The expressions are applied to the helical chains of polyoxymethylene and isotactic polypropylene. Observed frequency shifts can be reproduced…
Abstract A series of multiblock poly(ether‐ester‐amide)s (PEEA) based on polyamide‐6 (PA6) and poly(ethylene glycol) (PEG) is synthesized in a two‐step process. The first step represents the hydrolytic polymerization of ε‐caprolactam (CL) in the presence of adipic acid (AA) to carboxyl‐terminated PA6 oligomers of diff…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of the Stoeber reaction. 1. Properties of colloidal silica spheres prepared via alkoxide hydrolysisL. Jelinek, P. Dong, C. Rojas-Pazos, H. Taibi, and E. S. KovatsCite this: Langmuir 1992, 8, 9, 2152–2164Publication Date (Print):September 1, 1992Publication History Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnionic polymerization of monomers containing functional groups. 4. Anionic living polymerization of N,N-dialkyl-4-vinylbenzenesulfonamidesTakashi Ishizone, Junji Tsuchiya, Akira Hirao, and Seiichi NakahamaCite this: Macromolecules 1992, 25, 19, 4840–4847Publication Date (Pr…
We have investigated the pressure dependence of the superconducting transition temperature ${\mathit{T}}_{\mathit{c}}$ of elemental arsenic up to 41 GPa both experimentally and theoretically. Our measurements indicate that a peak in ${\mathit{T}}_{\mathit{c}}$ occurs at the rhombohedral--simple-cubic structural phase…
An investigation has been carried out to demonstrate the possibility of using the electrochemical potentiokinetic reactivation (EPR) method for determining the degree of sensitization of 12% Cr ferritic stainless steels. EPR tests were conducted on as-received and thermal-treated samples of a commercial heat of steel…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSteroid moieties attached to macromolecular petroleum fraction via di- or polysulfide bridgesP. Adam, B. Mycke, J. C. Schmid, J. Connan, and P. AlbrechtCite this: Energy Fuels 1992, 6, 5, 553–559Publication Date (Print):September 1, 1992Publication History Published online1…
Powder materials having the composition Pb 0.88 Ba 0.12 (Zn 1/3 Nb 2/3 ) 0.30 (Mg 1/3 Nb 2/3 ) 0.50 Ti 0.20 O 3 were prepared by a two-step calcination method. All the constituent oxides, except for PbO, were precalcined, and then the resulting mixtures were postcalcined with PbO to obtain powders having the desired c…
Variation of the saturation magnetization, the electrical resistivity, the Hall parameters, and the Seebeck coefficient with quenching temperature was measured in cobalt ferrites, Co/sub x/Fe/sub 3-x/O/sub 4/ (x=0.94, 0.97, 1.00, and 1.03). With increasing quenching temperature, the saturation magnetization of cobalt…
The reflectance and transmittance of dielectric thin films at oblique angles of incidence have strong polarization effects. For some applications these effects are undesirable. A nonpolarizing beam splitter design concept is shown, which is based on the fact that in a quarter-wave stack at lambda(o) two effective indi…
The SAXS behavior of six selected samples of a set of polyetherester thermoplastic elastomers based on polybutylene terephthalate (PBT) as hard segments and polyethylene glycol (PEG) as soft segments in ratios 41/59, 49/51, 57/43, and 75/25 wt. % was studied under and without stress. Three different glycols with M n o…
A number of different experimental techniques have been used to probe the details of structural changes on the binding of Ca(II) to the large number of known calcium-binding proteins. The use of luminescent lanthanide(III) ions, especially terbium(III) and europium(III), as substitutional replacement for calcium(II),…
This paper proposes new types of one and two-dimensional electrooptic (E-O) lenses of simple structure. The two-dimensional lens is composed of two one-dimensional E-O lenses which are arranged to converge light beams perpendicular to each other. The refractive index distribution of the lens is calculated using the fi…
This introductory textbook emphasizes the fundamental principles of textile science and describes the basic processes of fabric manufacturing. The presentation comprises five parts: fibers, yarns, fabrics, colors and finishes, and fabric end uses. The fibers section contains chapters on fiber classification, theory, a…