Materials Literature
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ABSTRACT Extracellular polymeric substance (EPS) secretion was examined in the stalked marine diatom Achnanthes longipes Ag. in defined medium. This common biofouling diatom exhibited an absolute requirement for bromide for stalk production and substratum attachment, whereas elevated iodide concentrations in the growt…
A stack of seven 15 μ thick polyvinlyl alcohol (PVA) foils was irradiated with 16 MeV electrons. In order to allow for the electrons’ slowing-down until stopping, six 5 mm thick Al plates had been inserted in between these PVA foils. The fractional depth distribution of the PVA destruction is derived from the change i…
Results are presented which demonstrate the existence of unambiguous three-dimensional quantum confinement of phonons within crystallites of the II-VI semiconductor CdSe, which were prepared by the method of diffusive growth within a doped glass matrix. The confinement was investigated by means of Raman scattering fro…
We study the velocity correlation function of a selected particle in a suspension of interacting Brownian particles. Experimentally, the velocity correlation function can be observed with diffusing wave spectroscopy. The function has also been determined in computer simulation. We assume a wide separation of time scal…
DC, AC electrical resistivity (ρdc and ρac (ω) and dielectric properties (ε' and tan δ) were studied for Zn0.8Co0.2Fe2O4 ferrite samples prepared at sintering temperatures (Ts) in the range 1273 to 1473 K by the usual ceramic technique. The experimental results indicated that the DC and AC electrical resistivity, Curi…
Abstract A methodology of predicting novel target high‐energy compounds has been developed. A formalized approach to computer generation of structural isomers starting from previous optimized gross formula has been elaborated on the joined basis of the graph theory, molecular crystal structure modeling methods and qua…
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…