Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric relaxation of the crystal-amorphous interphase in poly(vinylidene fluoride) and its blends with poly(methyl methacrylate)Bernd Hahn, Joachim Wendorff, and Do Y. YoonCite this: Macromolecules 1985, 18, 4, 718–721Publication Date (Print):April 1, 1985Publication His…
The microstructure of strontium titanate internal boundary layer capacitors at various stages in their processing was studied by transmission electron microscopy of rapidly quenched and normally cooled samples. Compositions containing excess TiO 2 , Al 2 O 3 , and SiO 2 have a completely wetting liquid phase at the si…
Abstract The gas permeabilities of three polyacetylene films, prepared from poly[1‐(trimethylsilyl)‐1‐propyne], poly( tert ‐butylacetylene), and poly(1‐chloro‐2‐phenylacetylene), were studied. Although depending on conditions of polymerization and membrane preparation, typical permeability coefficients P of the polyme…
Films of polyacetylene, , partially oxidized ("p‐doped") to 2% and 7% having compositions and , respectively, were employed as the cathode in electrochemical cells of the type . They were charged and discharged (both immediately and after a 16h delay) at constant currents ranging from 0.01 to 20.00 mA/cm 2 of film, an…
Etude de l'effet des cations modificateurs alcalins et alcalinoterreux sur le degre de polymerisation de verres de silicate, par spectrometrie RMN sous angle magique. La largeur de bande RMN augmente en fonction du pouvoir polarisant du cation. Un effet semblable a lieu dans les verres d'aluminosilicate a reseau tridi…
We derive a system of effective equations for wave propagation in a bubbly liquid. Starting from a microscopic description, we obtain the effective equations by using Foldy's approximation in a nonlinear setting. We discuss in detail the range of validity of the effective equations as well as some of their properties.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInternal model control. 2. Design procedure for multivariable systemsCarlos E. Garcia and Manfred MorariCite this: Ind. Eng. Chem. Process Des. Dev. 1985, 24, 2, 472–484Publication Date (Print):April 1, 1985Publication History Published online1 May 2002Published inissue 1 Ap…
Poly(epsilon-caprolactone) [PEC], a biodegradable aliphatic polyester, undergoes a two-stage degradation process: The first lengthy phase involves nonenzymatic hydrolytic cleavage of ester groups, the second phase beginning when the polymer is more highly crystalline, and of low molecular weight. The cellular events o…
Abstract The apparent viscosity of foam flowing through smooth capillaries was measured experimentally, and a mathematical model was developed. Foam texture (a measure of bubble volume) is a key parameter in determining the following properties of foam flowing through a capillary: (1) whether the foam exists as bulk f…
Anodic growth of polyaniline films on a Au microelectrode array has been carried out to add to the characterization of polyaniline and to fabricate polyaniline-based microelectronic devices, diodes and transistors, that function when the polyaniline-functionalized microelectrode array is immersed in an electrolyte sol…
乗用車用懸架ばねの高応力化指向, 弁ばねのパワーアップ指向は, 両者の要求レベルに差はあるとはいえ, いずれも耐久性の向上が共通した目標である. これを達成するには, 素材であるばね鋼の超清浄鋼化が1つの有力な手段であると考えられる.そこで, 低コスト・大量生産を前提とした脱ガス法を一般ばね鋼に適用して超清浄鋼を製造し, 懸架ばね用あるいは弁ばね用素材としての特性を検討した. その結果,(1) 200kgf/mm2級高強度懸架ばね用材料として, 酸素レベルを15ppm以下に下げたULO鋼が1つの有効な手段であるとの見通しを得た.(2) 低酸素化 (ULO) および低TiN化 (UL・TiN) 処理を適用したULO+UL・TiN鋼は…
Block copolymers represent an important class of multi-phase material, which have received very widespread attention, particularly since their successful commercial development in the mid-1960s. Much of the interest in these polymers has arisen because of their rather remarkable micro phase morphology and, hence, they…
The 'plate domain' structure in an Fe(5% Si) bar crystal with Neel orientation (bar axis (110); side faces (110) and (001)) is scanned by perpendicular transmission with polarised neutrons ( lambda >or=0.4 nm) and subsequent three-dimensional polarisation analysis, using a 80 mu m slit. The domains magnetised parallel…
The short-term, seasonal input of ground water to a small, precipitation-dominated oligotrophic lake in northern Wisconsin amounts to less than 10 percent of the annual water budget of the lake but accounts for nearly all the external silica loading. Silica is a necessary nutrient for diatoms. A large spring diatom bl…
Nature and Stability of Some Metallic Complexes of Dinucleating Cryptands in Solution. I. A Polyazapolyoxa Cylindrical Macrotricycle and its Monocyclic Subunit pH‐metry and UV spectrophotometry were used to study the complexing properties of the cylindrical macrotricycle, 1,7,13,19‐tetraaza‐4,16‐dioxa‐10,22,27,32‐tetr…
Abstract Water exchange on hexaaquavanadium (III) has been studied as a function of temperature (255 to 413 K) and pressure (up to 250 MPa, at several temperatures) by 17 O‐NMR spectroscopy at 8.13 and 27.11 MHz. The samples contained V 3+ (0.30–1.53 m), H + (0.19–2.25 m) and 17 O‐enriched (10–20%) H 2 O. The trifluor…
Abstract Additions of silicon to iron-base alloys have, in certain cases, produced significant improvements in resistance to general corrosion in a variety of acids, to chloride pitting resistance and to chloride stress corrosion cracking. The largest effect is produced by addition of 14.5% Si to iron, which make this…
Collagen from bone, dentine and tendon (type I), all of which contain the pyridinoline cross-link at varying levels, were each digested with CNBr. The resulting peptide mixtures were resolved by gel filtration on A1.5m agarose and assayed for pyridinoline. The polymeric cross-linked peptide complex, poly alpha 1CB6 [(…
We have measured accurate x-ray crystallographic data from the InSb(111)2\ifmmode\times\else\texttimes\fi{}2 reconstructed surface using synchrotron radiation from the DORIS storage ring at DESY. We have analyzed these independently of all models and find a structure with seven atoms in the unit cell, implying that on…
The temperature dependence of the infrared reflectivity spectra of NaNO 2 is reported for the ferroelectric and paraelectric phases, over a wide temperature range (10-500K). Reflectivity spectra from 5 to 600 cm -1 have been fitted with a model of the factorised form of the dielectric function including the relaxation…