Materials Literature
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The refractive indices and densities of a number of 4,4'-disubstituted phenyl benzoates and the Merck nematic phases ZLI 1052 and ZLI 389 are reported as functions of temperature in the nematic and isotropic phases. Also two isomers of 4,4'-disubstituted phenyl thiobenzoates are investigated. Comparison of Vuks model…
The authors have studied experimentally on the coprecipitation of dissolved silica with calcium carbonate (calcite or aragonite) and on the influence of silica dissolved in a parent calcium bicarbonate solution on the crystal form of calcium carbonate precipitated from the parent solution. The coprecipitation of disso…
The rates at which molecular sequences may deposit onto growing lamellae in a crystallising polyethylene melt are examined on the basis of the results of recent self-diffusion experiments in such melts, in conjunction with theories of molecular dynamics in polymer melts based on the reptation picture. The results are…
INCONEL Alloy 690 (Ni-30Cr-9Fe-0.02C, wt. %), is a new high-chromium nickel-base alloy, designed to provide a stable austenitic structure combined with resistance to corrosion and oxidation in aggressive industrial environments at elevated temperatures. Extensive laboratory evaluation of Alloy 690 during the past 12 y…
Abstract The generation of blisters due to irradiation by helium ions is investigated theoretically. The possible pressure in helium bubbles in metals, the binding energy of helium atoms and vacancies to a bubble are calculated. The kinetics of bubble growth is studied. Using the known profiles of implanted ions and d…
The formulae currently used to calculate volume changes on activation, ΔV≠0 and reaction, ΔV≠0, are shown to be unsuitable even at pressures of ≈ 1 kbar, and calculations are shown to be sensitive to errors, owing to empirical coefficients present in the formulae.The ΔVp=ΔV0[1–α ln (1 +βp)] relationship is substantiat…
The solubilities of octacosane in decane and dodecane and of hexatriacontane in hexane, octane, decane and dodecane in the temperature interval 11–38°C have been determined, and the standard enthalpies and entropies of solution, ΔHd and ΔSd, have been calculated from the solubility curves. For hexatriacontane ΔHd incr…
Using the optical Zeeman absorption spectrum of ${\mathrm{Er}}^{3+}$ and ${\mathrm{Cr}}^{3+}$ in ErCr${\mathrm{O}}_{3}$, the field-induced spin reorientations between ${\ensuremath{\Gamma}}_{1}$, ${\ensuremath{\Gamma}}_{2}$, and ${\ensuremath{\Gamma}}_{4}$ phases are investigated extensively. The data are analyzed usi…
The nematic liquid crystal is considered as a weak electrolyte. The analysis of the time behaviour of the transient current flowing through the sample allows the estimation of the mean mobility of anions and cations. The electrohydrodynamic flows are avoided thanks to the application of low voltages. For p-octyloxyphe…
Exposure of methanolic or acidic aqueous glasses containing halide salts together with organic phosphines or sulphides gave the electron loss centres R3P˙+ or R2S˙+ which reacted with halide ions (hal–) to give the σ* radicals R3P·—hal and R2S·—hal which were identified by e.s.r. spectroscopy. These were formed in com…
The present authors have studied the influence of barium and magnesium ions, which are contained together in a calcium bicarbonate parent solution, on the crystal form of carbonate formed from the parent solution. Magnesium ions in a parent solution inhibit calcite formation and favor aragonite formation, whereas bari…
Liǵuid us and subsolidus phase relations were studied using the quenching technique. The system contains four ternary compounds stable to liquidus temperatures: Na 2 TiSi 4 O 11 , Na 2 TiSi 2 O 7 , Na 2 TiSiO 5 , and Na 2 Ti 2 Si 2 O 9 . Six eutectics, eight peritecties, and eight thermal maxima were located and a reg…
The influence of metallurgical variables on the environment-sensitive cracking of austenitic Fe—er—Ni alloys, in particular austenitic stainless steels, has been examined. It has been demonstrated that the cracking susceptibility is sensitive to such metallurgical variables as composition, grain size, microstructure,…
An investigation was conducted to determine the nature of the deformation and fracture of silicon carbide and its effects on friction properties. Friction experiments were conducted with hemispherical and conical diamond riders sliding on the basal plane of silicon carbide. The results indicate that, when deformation…
Stress corrosion crack velocity in a-brass has been measured as a function of tensile crosshead speed and solution composition in aqueous solutions, mainly at pH 6.8. At low crosshead speeds the velocity was constant but at crosshead speed values high enough to cause general yielding the velocity increased with crossh…
1. Effects of feeding liquid milk-substitute to young calves either by nipple-pail or open-bucket on the rumen by-pass and on the rate of passage were studied. 2.Sixteen Holstein calves, aged 1 week initially, were used in three experiments in which calves were slaughtered after they were given liquids (milk-substitut…
The inhibitive efficiencies of thiourea and some of its derivatives have been studied in relation to the corrosion of aluminium (Grade 1060) in nitric acid at 25°c, 35°c and 45°c. The efficiency in 20% HNO3 at 25°c decreases in the order: p-chlorophenyl thiourea > m-chlorophenyl thiourea ≥ o-chlorophenyl thiourea ≥ ph…
Abstract Earlier publications demonstrated the capability of the EPIC‐3 code to perform high velocity impact computations in three dimensions. 1,2 These capabilities were demonstrated with simplified material and sliding surface models in a core‐contained computer program. This paper presents recent developments which…
Brushite (CaHPO4·2H2O) has been extensively studied using X-ray1),2),3),4) and infrared techniques5),6),7),8). However, no Raman data have been reported in the literature for this phase. In this paper, we will present the nonpolarized and
Vorlander,1 studying the melting behavior of various polyphenyl compounds, reported that both p-quinquephenyl and p-sexiphenyl exhibited liquid crystalline behavior. Based on these early qualitative observations and subsequent melting point determinations,2 specific mesophase transitions were designated for each compo…