Materials Literature
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The Korea Atomic Energy Research Institute (KAERI) and some foreign laboratories have carried out six examinations of pulled tubes from Korean nuclear power plants, since the first commercial operation of Kori Unit 1 in 1978. A total of 15 tubes were extracted that exhibited different types of failures such as pitting…
Summary In this paper, we extend to three fluid phases a prior finite-element study of hydraulic conductance of two-phase creeping flow in angular capillaries. Previously, we obtained analytic expressions for the hydraulic conductance of water in corner filaments. Here, we present the results of a large numerical stud…
We have studied the pinning of magnetic domain walls on a simplified model of the cell structure of Sm(Co,Fe,Cu,Zr)/sub z/ precipitation hardened magnets. The pinning field strongly depends on the thickness of the intercellular phase if it is smaller than the domain wall width. Its maximum value has been verified with…
The basic mechanisms of crystallisation in polymers and copolymers are reviewed and compared with those of other classes of materials. It is shown that, with one possible exception, polymers generally crystallise by secondary nucleation, like other covalent materials. In the case of polymers, however, the behaviour is…
Abstract Because of very different heating rates in hot‐tool and vibration welding, and the higher weld pressures used in vibration welding inducing more squeeze flow, the weld zones in these two processes see very different flows and cooling rates, resulting in different morphologies. The weld morphologies of bisphen…
The dominant components of the χ(2)(-ω; ω, 0) nonlinear quadratic susceptibility tensor of a poled polymer-based nonlinear organic thin film are measured independently with a Fabry–Pérot interferometric technique. Electro-optic dispersion is obtained from visible wavelengths up to 1.550 μm leading to a wavelength-inde…
The magnetic domain structure and properties of sintered Sm(Co/sub bal/Cu/sub 0.07/Fe/sub 0.22/Zr/sub 0.04/)/sub 7.4/ have been investigated, at different aging stages and applied fields. A low coercivity (0.2-2 kOe) developed during isothermal aging at 800/spl deg/C for 16 h, while a maximum coercivity of 31 kOe was…
The oxidation of naphthalene was investigated in a biomimetic catalytic system using KHSO 5 and iron(III) tetrakis(p-sulfonatophenyl)porphyrin ( FeTPPS ) in order to elucidate the influence of solution forms, such as buffer pH and co-solvent types, on the reaction. 1,4-naphthoquinone was the main byproduct and the eff…
Abstract This paper is in four parts. The first is related to general considerations and experimental analyses, and each of the successive papers is related to different approaches to theoretical analyses of the mechanical behaviour of weft-knitted fabrics and weft-knitted reinforced composites made of glass fibre. Th…
Wood-plastic composites have emerged primarily in response to the need for moisture-durable wood-based materials. Although a great deal of research has addressed extruded composites and formulations, little work has addressed the use of thermoplastics to modify conventional particulate wood composites. This research i…
The flow behaviour and ductility of the Al-alloy AA7075, Mg-alloy AZ80 and Ti-alloy Ti-6Al-4V were investigated in quasi-static and dynamic compression tests at strain rates in the range 0.001 s -1 ≤e ≤5000 s -1 and temperatures between 20°C and 450°C. For strain rates e≤100 s -1 , the compression tests were carried o…
Undoped and phosphorus-doped diamond thin films grown by Microwave Plasma-enhanced Chemical Vapour Deposition (MPCVD) on Ib {111}-oriented diamond substrates have been studied by confocal micro-Raman spectroscopy and confocal Raman imaging. A distinct Raman peak, broader and 6 cm−1 lower than the zone-centre optical p…
A complex investigation of the dynamics of electronic excitations in potassium dihydrophosphate (KDP) crystals is performed by low-temperature time-resolved vacuum ultraviolet optical luminescence spectroscopy with subnanosecond time resolution and with selective photoexcitation by synchrotron radiation. For KDP cryst…
Degradation of water resources due to anthropogenic activities is a major problem all over the world. Monitoring changes in water quality is expensive but essential for management of water resources. Diatom assemblages can serve as useful indicators of changes in water quality. In order to determine changes in stream…
Abstract A near infrared (NIR) spectroscopy approach was undertaken to collect information on the Al cationic distribution in tetrahedral and octahedral sites in natural chlorite (clinochlore) samples. Structural formulae were established using electron microprobe and Mössbauer spectroscopy. A band located near 7115 c…
The process of polymers weathering and the methods of polymers weathering and accelerated ageing investigations were characterized. Accelerated ageing tests of polyethylene and polypropylene samples have been done in laboratory conditions. The ageing time (up to 400 h) influence, at various levels of ageing factors: U…
The soft magnetic property of FeCo films with thin NiFe or NiFeCr seed layers (saturation flux density of 2.4 T) is discussed in relation to lattice strain of the FeCo films. The coercivity along hard axis of magnetization (H/sub c//sup HA/) reduces as the Ar pressure during sputtering deposition decreases, and moreov…
Taylor impact tests were performed on ductile and brittle materials metals and the results indicate that failure is initiated by the coalescence of lateral release waves behind the incident shock formed upon impact. The failure process in the ductile materials involves nucleation and growth of voids and in the brittle…
Abstract We present a foam flow model for flow pattern prediction in the polyurethane foaming process that considers the flow caused by foam expansion due to bubble generation. The flow pattern in the cavity is calculated by taking into account the initial volume shape and the rate of foam expansion of a poured reacti…
A continuum model is employed to study systematically the optical response of hybrid-aligned nematic (HAN) liquid crystal cells under the application of an external electric field. The influence of the flexoelectric effect is discussed for a large range of anchoring strengths at the homeotropic alignment layer. It is…