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Two new six-ring double-swallow-tailed mesogens were prepared. The phase behaviours of these compounds were studied by optical methods and by calorimetry. One of them shows the very unusual phase sequence crystalline-smectic C-cubic-isotropic-nematic-isotropic.
A pure-bending apparatus is used to measure the constitutive relationship between applied pure bending moments and the resulting curvatures of a few superelastic alloy wires. The sample nickel-titanium alloy (NiTi) wires change phase when ample bending moments are imposed. Like the material’s uniaxial tension stress-s…
In this paper, a model that describes the transient heating of a thin wire causing the tip to melt, roll-up of the molten mass into a ball due to surface tension forces, and the subsequent solidification of the molten material due to conduction up the wire and convection and radiation from the surface, has been provid…
Abstract The molecular interactions of poly(vinylchloride) (PVC) with some solvents [cyclohexanone (CH), methyl ethyl ketone (MEK) and N ‐methylpirrolidone (MP)], esters [dioctylphthalate (DOP) and butyl stearate (BuSt)], and polyesters [poly(ethylene adipate) (PEA) and poly(ε‐caprolactone) (PCL)] have been investigat…
The paramagnetic and optical properties of sixfold coordinated ${\mathrm{Zr}}^{3+}$ ions (T centers) in x-ray-irradiated yttria-stabilized zirconia have been investigated. We propose the attribution of the optical absorption to intracenter transitions as suggested by optical bleaching experiments. Wave functions and e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructures and Magnetic Susceptibility Studies of Four New High-Nuclearity Copper(II) Halide OligomersM. R. Bond, H. Place, Z. Wang, R. D. Willett, Ying Liu, Todd E. Grigereit, John E. Drumheller, and George F. TuthillCite this: Inorg. Chem. 1995, 34, 12, 3134–3141Publicatio…
The feasibility of preparing small‐diameter, high‐strength, thermally stable silicon carbide fiber tows by the continuous chemical vapor deposition (CVD) of SiC onto carbon fiber tows was experimentally evaluated. Calculations of bending stresses and stresses caused by thermal expansion mismatch between the substrate…
Experimental results are presented for the relaxation of a two dimensional soap foam in which wall breakage is initiated through gentle warming of the foam cell. Significantly different phenomenology from the relaxation of nonbreaking foams is observed. At a critical ``break time,'' which depends on the temperature ra…
In this paper it is shown that nonhomogeneities in the field sweep rate dB/dt along the length of a Rutherford cable provoke a nonhomogeneous current distribution during a field sweep. This process can be described by means of super coupling currents (SCCs) flowing through the strands over lengths far larger than the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDinuclear Titanium(III) Complexes. Exchange Coupling in (Cp2Ti)2(.mu.-O)Wayne W. Lukens Jr. and Richard A. AndersenCite this: Inorg. Chem. 1995, 34, 13, 3440–3443Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1 June 1995h…
The fluorescence of ${\mathrm{Sm}}^{2+}$:BaFCl and ${\mathrm{Sm}}^{2+}$:SrFCl has been measured under pressures up to 8 GPa. The energy-level schemes of ${\mathrm{Sm}}^{2+}$ in the two host crystals are determined in this pressure range. The earlier problem in the crystal-field (CF) levels of the $^{5}$${\mathit{D}}_{…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplex Formation between Sodium Dodecyl Sulfate and Poly(4-vinylpyridine N-oxide)Pratap Bahadur, Paul Dubin, and Y. Kameshwer RaoCite this: Langmuir 1995, 11, 6, 1951–1955Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBonding in Mg2Si Studied with X-ray Photoelectron SpectroscopyM. R. J. van Buuren, F. Voermans, and H. vanKempenCite this: J. Phys. Chem. 1995, 99, 23, 9519–9522Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1 June 1995ht…
The dielectric constant and losses of good quality ceramic samples of Nb-doped (1 wt % ${\mathrm{Nb}}_{2}$${\mathrm{O}}_{5}$) ${\mathrm{PbZr}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ti}}_{\mathit{x}}$${\mathrm{O}}_{3}$ about the ferroelectric-paraelectric transition for 0.03\ensuremath{\le}x\ensuremath{\le}0.0…
In an Fe-Al-Si-O-H (FASH) system, the predominant hypothetical stoichiometric end-members are H2Fe4Al18Si8O48 (2H) and H6Fe2Al18Si8O48 (6H). End-member molar volume (V), specific heat (Cp), and calorimetric entropy (S) are presented. Using: 1) the above values for V and Cp, 2) thermodynamic data for additional phases…
Abstract Narrow‐distribution fractions of poly{2,5‐bis[(4‐methoxybenzoyl)oxy] styrene} ranging in weight‐average molecular weight Mw from 1.1 × 10 5 to 1.96 × 10 6 were studied by static light scattering and viscometry in THF at 25 ° C. From Mw and the intrinsic viscosity [ η ] Mark‐Houwink‐Sakurada equation was formu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDensity Discontinuity at the Microphase Separation Transition of a Symmetric Diblock CopolymerH. Kasten and B. StuehnCite this: Macromolecules 1995, 28, 13, 4777–4778Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1 June 1…
Summary The sorption of zinc (Zn) by two acid tropical soils, Mazowe clay loam (kaolinitic, coarse, Rhodic Kandiustalf) and Bulawayo clay loam (coarse, kaolinitic, Lithic Rodustalf), was studied over a wide range of Zn solution concentrations. Samples of the two soils used in the experiments were collected at both unc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEfficient Preparation of the .alpha.,.alpha.,.beta.,.beta.-Atropoisomer of meso-Tetrakis(o-aminophenyl)porphyrinEric Rose, Aurelien Cardon-Pilotaz, Melanie Quelquejeu, Nicolas Bernard, Alain Kossanyi, and Bernard DesmazieresCite this: J. Org. Chem. 1995, 60, 12, 3919–3920Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray Photoelectron Spectroscopic Studies of Cadmium and Selenite Adsorption on Aluminum OxidesCharalambos. PapelisCite this: Environ. Sci. Technol. 1995, 29, 6, 1526–1533Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1 J…