Materials Literature
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Improved oxygen diffusivity is essential for reducing mass transport losses in polymer electrolyte fuel cells (PEFCs). In this work, effective oxygen diffusivity in the presence of liquid water inside a gas diffusion layer (GDL) was investigated by means of coupled experimental and numerical analyses. In order to cont…
Silicon powder was encased within carbon gel microspheres with different porosities by simply adding silicon powder to the water phase during the inverse emulsion polymerization of resorcinol with formaldehyde, followed by drying and carbonization. From the results of charge-discharge experiments, it was confirmed tha…
At Japan Atomic Energy Agency (JAEA), a MeV accelerator has been developed to demonstrate acceleration of H− ion beams at the ITER-relevant power density. After long pulse beam acceleration tests of up to 10 s, molten areas were observed around the apertures of the grids due to excess heat load on the grids. To identi…
Analyzing damage mechanisms when a deformable impactor is impacting a reinforced 3D woven composite is aimed in this work. Low energy impact are considered in this soft shock situation using a drop test tower. Materials involved in this study are hemispherical elastomer impactors and carbon fibers in RTM 6 resin for t…
The New noble metal nanostructure for surface enhanced Raman scattering (SERS) detection in microfluidic devices was developed. In this nanovalley structure, gold nanoparticles of 40 nm diameter were assembled along grooves of 200 nm deep which were fabricated on Polydimethylsiloxane (PDMS) by the nanoimprint method.…
There are now twenty commercial nuclear power reactors operating as of May 2010 in South Korea. As nuclear capacity becomes higher and installations age, the Korean government and industry have launched R&D to estimate appropriate decommissioning costs of power reactors. In this paper, MCNP/ORIGEN2 code system which i…
For the fi rst time the conditions of synthesis by ion-colloid layering of layers of nanocomposite FeOOH— x H 3 PW 12 O 40 on the surface of silica were defined using successively adagulation of FeOOH colloidal particles, and adsorption of H 3 PW 12 O 40 . Investigation of the synthesized layers was carried out by sca…
In this paper a comprehensive set of the time-limited ageing analyses for justification of long-term operation of WWER-440/213 type units will be presented. The scope covers mainly fatigue analyses of Safety Class 1 and 2 structures and components, reactor pressure vessel pressurized thermal shock analyses, etc. like…
Thin films of polyethylene have been exposed to thermal and photochemical accelerated agings at different temperatures and different UV intensities. In both cases, mechanical tests performed on aged samples revealed a severe embrittlement of the PE material. However, a multi‐scale analysis showed that i) under thermal…
The main focus of the article is on the reflection of welding with small foci. Questions regarding efficiency, the chance of increasing speed and thus reducing cycle time in production are particular key subjects. Furthermore, examples of applied parts will be presented and evaluated. Moreover, a correlation will be s…
The scavenging effects of metal complexes of thiacalix[4]arenetetrasulfonate (Me-TCAS[4], Me=H₂, Fe³(+), Mn³(+), Mn²(+), Cu²(+), and Zn²(+)) on superoxide anion radicals (O₂⁻) generated from the xanthine-xanthine oxidase system were investigated by the nitroblue tetrazolium (NBT) method and electron spin resonance (ES…
In this paper, the microstructures of two kinds of butterfly scales, Morpho type and Urania type, are obtained using scanning electron microscope (SEM) and transmission electron microscope (TEM). Three structure models of the first type are constructed and their corresponding reflectivity spectra are simulated using f…
A novel image analysis method combined with recently developed powerful computing hardware is proposed, in which the time course for the image data of silver staining gel taken during the developmental process was used for the analysis of protein spots in two-dimensional polyacrylamide gel electrophoresis. The alignme…
An IC-compatible technique for photonic crystal sensors is presented here to fabricate dense arrays of high aspect ratios nanopillars, which are made of extremely hard materials that are difficult to shape, such as TiO2. This technique, called Atomic layer deposition ARrays Defined by Etch-back technique (AARDE), can…
The corrosion characteristics and mechanical behavior of Al/SiCp/spinel composites prepared by reactive infiltration with fly-ash (FA) and rice-hull ash (RHA) -both with recycled aluminum- were investigated. MgAl2O4 is formed in situ during infiltration in the temperature range 1050-1150 °C for 50-70 min in argon atmo…
In this paper, the 0.98(Na0.5K0.5)NbO3–0.02Ba(Sn0.02Ti0.98)O3 ceramics with the addition of 0–4.0 wt % Mn2O3 have been prepared following the conventional mixed oxide process. The disc samples were sintered in alumina crucible at 1100°C for 3 h in air. For 0.98(Na0.5K0.5)NbO3–0.02Ba(Sn0.02Ti0.98)O3 ceramics, the elect…
Group contribution methods are presently one of the universal and the most frequently used approach to estimate many physico-chemical properties of compounds. One of the important steps in development of group contribution method is a correct division of chemical structures of compounds into defined structural fragmen…
The Einstein crystal method was used to determine free energy differences between some crystalline structures of hard, homonuclear tetramers. The tetramers, each built of four identical hard spheres centered on vertices of a regular tetrahedron of sides equal to the sphere diameter, were arranged in such a way that th…
Reported nanocomposites of poly(vinyl chloride) have been prepared using bentonite‐based clay, Na‐montmorillonite (nature clay) and organophilic clay 30B. Polymer nanocomposites of differing compositions were produced using Buss KO‐kneader via melt intercalation method. The effect of different type of plasticizer (bot…
Hydroxyapatite (HAP) nanoparticles (NPs), which interfaces temporarily or permanently with viable tissues and cells, are in current use covering a wide range of medical applications, hence, it is indispensable to study the potential side effect acting on living organism, and to figure out the biocompatibility evaluati…