Materials Literature
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Calcium aluminate glasses show high sensitivity to ultraviolet radiation without the doping of optically active components. A mechanism is proposed to account for their photosensitivity on the basis of the result that the cause of UV‐induced coloring is the emergence of two kinds of paramagnetic centers, an aluminum‐o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemical and electrochemical characterization of the iron-iron multiple-bonded [Fe2(.eta.5-C5H5-xMex)2(.mu.-NO)2]n dimers (x = 0, 1, 5; n = 0, 1-): a structural-bonding analysis of the iron and cobalt nitrosyl bridged [M2(.eta.5-C5H5)2(.mu.-NO)2]n series (M = Fe, n = 0…
Alpha implantations in boron carbide samples were carried out different controlled temperatures ranging from 750 to 1720°C and the irradiated samples were observed in an electron microscope. Below 1500°C one part of the implanted helium produces lenticular bubbles within the grains whereas another part accumulates at…
Abstract The paper starts with some general introductory comments on properties and influence factors such as biocompatibility, surface structure, processibility and purity. Hence it is derived that polyurethanes deserve special attention as biomaterials, which is explained by the variability of the structure. A numbe…
Raman spectra have been recorded for glasses in the binary systems CeO 2 ‐P 2 O 5 and Pr 2 O 3 ‐P 2 O 5 . The cerium phosphate glasses were prepared having different concentrations of CeO 2 and the praseodymium phosphate glasses with different ratios of Pr 3+ to Pr 4+ . The spectra indicate that both cerium and praseo…
Calcium aluminate glasses show high sensitivity to ultraviolet radiation without the doping of optically active components. In this paper, photosensitive characteristics and the cause of UV‐induced coloring were investigated for these glasses. Ultraviolet rays below 270 nm were effective for inducing the coloring. The…
Abstract A ternary‐solvent HPLC method for analysis of the components of the tumor‐localizing product HPD is described. This HPLC system was used to assess the utility of a new method, based on gel exclusion chromatography, for purification of hematoporphyrin.
The complex dielectric constant ε as well as the complex piezoelectric constant d and the complex elastic constant s of iron doped PZT ceramics were measured after poling as a function of time. It was found that the aging behaviour of the material parameters is similar. The time dependence of the losses shows that agi…
The diatom genus Cyclostephanos Round is invalidly published because a legal type was not designated at the time of description. Round apparently intended for Stephanodiscus novaezeelandiae Cleve to be the type of the genus. That species is proposed here as the lectotype of the name Cyclostephanos and a lectotype is p…
Dielectric measurements in the frequency range (104 to 10-3 Hz) are presented for opaque PMN [Pb(Mg1/3Nb2/3)O3] hot-pressed ceramic samples. Equivalent results for transparent lanthanum-doped PMN and PMN (90%): PbTiO3 (10%) are also presented. Observation of “Anomalous Low-Frequency Dispersion” has new implications fo…
An analysis of the use of fines destruction during batch crystallization based on the population (number) balance is presented. The effects of operating policy and fines crystal cut size and destruction rate are examined in detail for two cases viz. natural and controlled cooling respectively. It is predicted that use…
Abstract Magnetic particles of iron oxide were blended into portions of a high molecular weight sample of poly(dimethylsiloxane) which were then peroxide cured in a magnetic field. Strips cut from the resulting elastomers parallel and perpendicular to the magnetic lines of force were studied with respect to their equi…
Titanite CaTiOSiOa from calc-silicate rocks of Gebel Umm Shagir, Egypt, associated with garnet, p,'roxene, scapolite, calcite and quartz, contains up to 11 wt.9o Nb2O5, 6 wt.9o Al2O3 and2 *t.Vo V2Oj. Other elements present in minor amounts are Fe, Ta, Sn, and F. The main substiturions are2Ti : Nb + AI, Ti + O = Al + (…
Fifteen reference patterns of boride, silicide, selenide, telluride and oxide ceramics are reported. Included in the 15 reference patterns are data for three oxide phases which are related to high critical temperature (T c ) superconducting materials: BaCuO 2 , BaCuSm 2 O 5 and BaCuYb 2 O 5 . Four other patterns are i…
A nonsteady-state cooling method has been used to measure the thermal diffusivity (α) of nonwovens. The method is relatively simple and requires a minimum of spe cialized equipment. The calculations required to obtain α from cooling curves are somewhat involved but can be easily performed on a small computer. The appa…
Abstract ESCA and contact‐angle measurements were used to characterize the surfaces of polystyrene films exposed to SF 6 , CF 4 , and C 2 F 6 plasmas. SF 6 plasmas cause loss of aromaticity in the polystyrene surface region via saturation of the phenyl ring and/or carbon‐bond breakage and subsequent fluorination. C 2…
Sinterability of undoped, MgO‐doped, and TiO 2 ‐doped Al 2 O 3 has been examined by applying reported sintering equations. The order of sinterability was MgO‐doped ∼ undoped≪ TiO 2 ‐doped Al 2 O 3 in the initial and intermediate stages of sintering, but a relative sintered density at 1600°C for 1 h occurred in the ord…
Neutron inelastic scattering experiments have been performed to investigate the long-wavelength spin dynamics of the amorphous isotropic ferromagnet ${\mathrm{Fe}}_{100\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{B}}_{\mathrm{x}}$ (for x=14 and 18). At both iron concentrations this system exhibits Invar behavior. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of (alkylperoxo)cobalt(III) porphyrins: first direct evidence for metal-carbon bond homolysis in dioxygen insertion reactionsMaureen J. Kendrick and Walid Al-AkhdarCite this: Inorg. Chem. 1987, 26, 24, 3971–3972Publication Date (Print):Decemb…
Abstract The split-Hopkinson pressure bar (SHPB) technique has been adapted to measure the dynamic response of soil to impulse loads. The experimental technique is relatively simple and can investigate soil response in regimes beyond the capabilities of current equipment used for dynamic soil laboratory investigations…