Materials Literature
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Benzocrown ethers carrying a para-substituted biphenyl group, (1a–c and 2a,b), display a nematic liquid crystal phase; selective complexation with picrates in the liquid crystal phase was observed by doping experiments.
The in vitro antiplatelet aggregating activity of magnesium and magnesium associated with soluble citroflavonoids (hesperidin and eriodictin, 1:1) is well-established. The degree of inhibition of in vitro platelet aggregation activity produced by different concentrations of magnesium halogenates was determined. ADP (4…
Following an earlier paper, the equilibrium of an axisymmetric sessile drop resting on a thin, elastic plate has been considered using the minimum free energy hypothesis. A consequence is that although Young's equation is still obeyed at the triple line when considering the true contact angle, the apparent contact ang…
The kinetics of the nitrogen reaction with liquid Fe-C alloys was investigated by using the isotope exchange technique. The effect of small amounts of S, P, Pb, Sn, Bi and Te in Fe-Csat, alloys on the rate constant of the interfacial nitrogen reaction was studied at 1450°C The rate constant for Fe-Csat.-S alloys was i…
The structure of first-order twin boundaries in Mg-Al spinel has been examined using high-resolution transmission electron microscopy. Comparison of experimental images with computer calculated images of model twin boundaries, obtained using a multislice image simulation program, allow different twin structures to be…
A range of surface treatments including degreasing, abrasion, chromate etching, plasma etching and nitric-sulfuric acid etching were applied to unreinforced and 20 vol. % glass fiber reinforced polyetheretherketone. Single lap shear adhesive joints were prepared using a nylon-fabric-supported epoxy resin film adhesive…
Experimental data indicate that in the isostructural series the easy axis of the spontaneous magnetisation within the hexagonal plane alternates with the sign of the third Stevens factor. This confirms that the magnetocrystalline anisotropy of the rare-earth ions in the RCo 5 and R 2 Co 17 intermetallics has a single-…
The crystallization of glass/ceramic composite was examined, using borosilicate glass and several kinds of ceramic powders. Most composite systems consisted of borosilicate glass and ceramics formed cristobalite during firing, whereas those specimens that include alumina or aluminum nitride did not form any crystal.Th…
This will be an entirely personal report about the development of a branch of experimental physics more than 50 years ago at the “Physikalisches Institut” of the “Eidgenössische Technische Hochschule”, (ETH) in Zurich. At that time Paul Scherrer—best known for his contribution to the development of the Debye-Scherrer-…
Comparisons are made between experiment and theory for the bremsstrahlung cross-section differential in photon-emission angle and energy for incident electrons of 50, 75, and 100 keV, for target elements of C, Al, Cu, Y, Ag, Te, Tb, Au, Bi, and U for photons radiated at 90\ifmmode^\circ\else\textdegree\fi{}. The prima…
Surface interactions of H2, CO and CO2 with the perovskite-type oxide LaMnO3 have been studied by temperature-programmed desorption (t.p.d.) and i.r. spectroscopy. A t.p.d. desorption peak of H2 at 355–360 K, which increases in intensity with increasing reduction temperature of the oxide (Tr), is assigned to molecular…
The solid state polymorphism of MBBA has been studied and its phase diagram completed. Literature data were analysed and, essentially, neutron scattering results were used to describe the phase situation in MBBA. Transitions between the metastable solid modifications-originating from the fast-cooled glassy state-are c…
The influence of oxoacidity on the corrosion of iron in molten sodium nitrate‐nitrite mixtures has been demonstrated by means of potential‐ p O 2− diagram. Oxoacidobasic titrations of iron(III) have been carried out by means of potentiometric measurements with an yttria‐stabilized zirconia membrane electrode, indicato…
p-アシロキシ安息香酸を液状パラフィンまたはサームS800 (R) 中で重合させることにより, 針状のポリ (p－オキシベンゾイル) 結晶を得た. 重合は静止状態330℃で360分間行った. 得られた針状結晶の密度は, 1.50～1.51g/cm3で単位格子の大きさから求めた結晶密度1.52g/cm3に非常に近い値を示した. また, X線粉末図形では非晶部に基づくピークは認められなかった. 更に, 他の形態を持つ結晶と比較して高い転移温度及び分解温度を示した.これらの事実からこの針状結晶が高分子ウイスカーであることが強く示唆された.
Electronic spectroscopic data are reported for CoI, CoII, and CoIII mononuclear tetra(neopentoxy)-phthalocyaninate(2–)(L1) and bridged binuclear tri(neopentoxy)phthalocyaninate(2–) species in solution and film phases. Electrochemical data show that the [CoIIL1] species cannot exist in a non-co-ordinating or weakly co-…
The oxidation kinetics of Zircaloy-4 in steam have been extended to 2400°C. Growth of the ZrO2 and α-Zr(O) layers display parabolic behavior over the entire temperature range studied; however, a discontinuity in the oxidation kinetics above 1510°C causes rates to increase above those previously established by the Bake…
The strength of obstacles impeding the motion of dislocations has been studied using an etch hillock technique. Plate tin single crystals (99.999 mass% purity) were stretched in the [110] direction by a creep-testing apparatus. When applied shear stresses on the [100](010) slip system were more than 55 kPa, all the pr…
Effects of CaO and SiO2 additives on the magnetic properties, density and microstructures of the sintered compacts of Sr-ferrite were investigated. It was revealed that CaO and SiO2 additives play important roles of rapid densification and grain growth controll through the sintering process of Sr-ferrite compacts. EPM…
Abstract It could be shown that the structure of poly(styrylpyridine)s (PSP), which are heat resistant thermosetting resins resulting from the polycondensation of 2,4,6‐trimethylpyridine ( 1 ) with terephtalaldehyde ( 2 ), is much more complicated than that expected from this polycondensation. 2‐Styrylpyridines were s…
Presented in this paper are the effects of temperature on the early age properties of two rapid-hardening magnesium phosphate-based cements and their combinations, as follows: (a) magnesium phosphate cement for cold and regular weather use; (b) magnesium phosphate cement for hot weather use; (c) a 50-50 blend of magne…