Materials Literature
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The sequence of phase formation through the solidification range of BS 1400: AB2 nickel-aluminium bronze has been studied using both a controlled unidirectional solidification technique and isothermal treatments. Two different forms of iron-rich k1-phase were seen to be precipitated from the liquid at above the liquid…
Results of several uniaxial in-reactor creep tests, carried out in a temperature range of 553 to 623 K on Zircaloy-2 cold-worked specimens in fast flux (E > 1 MeV) from 1.2 × 1017 to 1.1 × 1018 n·m−2 · s and in a stress range from 98 to 157 MPa, are presented. The effects of instantaneous flux and applied tensile stre…
The transport properties of NaCI single crystals have been investigated using material with a cation impurity content ∼ 1 ppm and a dislocation density of 103-104 cm−2. Over the temperature range 374-505°, vacancy diffusion of 22Na through the lattice occurs with an energy of 1.25 eV. Marked linear tails in the diffus…
Energy loss and straggling for protons, deuterons and α-particles in thin gold foils were measured by the indirect transmission technique. The measured stopping powers of the hydrogen ions agree reasonably well with the semi-empirical values of Andersen and Ziegler. The measured stopping powers for the helium ions are…
Ion-profile analysis (by ion sputtering) and ultraviolet spectroscopic examination of thin plates (0.5 mm) of sodium borate glass (35 mol% Na2O), subjected to electrolysis using a thallium-amalgam anode and a platinum cathode, reveal migration of some sodium ions from the anode region and their replacement, at least p…
We measure the apparent bulk modulus corresponding to the layer compression of a SA liquid crystal, versus the frequency of an applied strain. For thin samples, we observe an elastic regime, a high frequency internal friction resonance, and at low frequency a stress relaxation attributed to the climb of edge dislocati…
A thin-film electrochromic device using Li 2 WO 4 , which is shown to be an Li electrolyte by the fact that the coloration response is independent of the atmosphere, is found to exhibit quick response (coloration: 50 ms, bleaching: 200 ms). The spontaneous coloration is suppressed by the deposition of a WO 3 film at l…
This paper presents a coordinate-free method of solving the problem of electromagnetic wave reflection from the surface of a uniaxially anisotropic medium. Based on the direct manipulation of vectors, dyadics, and their invariants, the method eliminates the use of coordinate systems. It facilitates solutions and provi…
The motions of individual dislocations and dislocation arrangements in white tin single crystals deformed in tension were closely investigated using the etch hillock technique. When dislocations of the slip system (010) [100] move, they form bands (A-bands) which contain a high density of dislocations and run nearly p…
The corrosion performance of one-side Precoated steels for automotive body was investigated and new precoated steel suitable for exterior panel use was evaluated by several kinds of corrosion testing. Ni-Zn alloy electroplated steel may be more effective for insufficiently painted portion. Application of Fe-Zn alloy p…
A general equation for determining squeeze life has been developed which can be derived theoretically and correlates extremely well with experimental and field data. This equation can be applied to scale inhibitor residual data to more accurately predict the average scale inhibitor concentration in the residual water…
Transmission-loss characteristics of Al2O3-doped silica fibers have been investigated to develop an Al2O3alternative dopant for VAD silica-based optical fibers. Optical properties of Al2O3-doped silica bulk glass and fibers were measured in the0.11-30-\mum spectral region. From the experimental results, the intrinsic…
The properties of chalcogenide glasses depend on both chemical composition and molecular structure. The method of controlling the properties of chalcogenide glasses by changing their molecular structure is considered. The effect of both the chemical composition and the nature of the chemical bonding on the efficiency…
Abstract A number of new liquid crystalline tetrazine derivatives was synthesized. The electro‐optical studies showed that the 3‐n‐alkyl‐6‐[4‐(4‐n‐alkyl‐cyclohexanoyloxy)phenyl]‐1,2,4,5‐tetrazines are excellent dyes for guest‐host displays with positive colour contrast.
This paper deals with some specific properties of amidopolyamines, closely related to polyamides, which have been used as curing agents for epoxy resins. A series of compounds has been prepared and their general properties described. Only two properties have been examined in detail, namely, those of inhibit(on of corr…
Lattice parameters of quenched Mn1−XFeX (X=0.27–0.31), (Mn1−XFeX)0.95Cu0.05 (X=0.15–0.28), and (Mn1−XCoX)0.95Cu0.05 (X=0.05–0.19) alloys were measured at temperatures between 80 and 480 K. The Mn–Fe and Mn–Fe–Cu alloys transformed from fcc to fct(c⁄a<1) structure on cooling below a critical temperature which was equal…
We theoretically investigate fluctuations in a nematic liquid crystal about a non-equilibrium steady state due to a stationary shear flow. For the special case, where the wave-vector lies in the shear plane, we find that the central peak in the light scattering spectrum (caused by director fluctuations) is (in additio…
The permeability to water of the fibre cell wall of birch (Betula pubescens Ehrh.) and lime (Tilia × vulgaris Hayne) wood, was measured in wood slices in which most of the void space was filled with paraffin wax or a polymerizing silicone elastomer. An osmotic technique was used with solutes of molecular weight great…
The smectogenic compound 4-acetyl-4'-n-tetradecanoyloxyazobenzene was considered. The phase diagram of the binary mixture of its constituent parts, that is dodecane and 4-acetyl-4'n-acetoyloxyazobenzene, was determined. A miscibility gap in the liquid state was observed. This was considered as support for the view tha…
An evaluation has been made of the action of khellin, a furochromone derivative from Ammi visnaga, at the dose of 50 mg q.i.d. during four weeks, on the plasma lipids of 20 non-obese normolipaemic male subjects after a placebo period of two weeks. The plasma lipids were measured each week and one week after discontinu…