Materials Literature
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The reflection and transmission of optical videopulses incident axially upon a slab of a chiral sculptured thin film (STF) is studied using a finite-difference simulation in the time domain. Videopulse bleeding is shown to occur when the handedness of the carrier plane wave matches the structural handedness of the chi…
The use of silicon nitride for high temperature components in gas turbine engine and other heat engine applications continues to be sought due to the potential for significant improvements in both efficiency and emissions. However, low impact resistance and inadequate resistance to environmental degradation of current…
The Rayleigh-Plesset equation has been used extensively to model spherical bubble dynamics, yet it has been shown that it cannot correctly capture damping effects due to mass and thermal diffusion. Radial diffusion equations may be solved for a single bubble, but these are too computationally expensive to implement in…
Mesoporous Si-MCM-41 supported Ga2O3 is a highly active catalyst for the acylation of aromatic compounds with different acyl chlorides. Moreover, this catalyst is not deactivated by water and hence does not require moisture-free reaction conditions.
(Novel photosensitive glasses / Ebendorff-Heidepriem, H. et al.) From Glastech. Ber. Glass Sci. Technol. 75 C2 (2002)54-59 by courtesy of the German Society of Glass Technology(DGG).
A phase-field model is developed to simulate free dendritic growth coupled with fluid flow for a pure material in three dimensions. The preliminary results presented here illustrate the strong influence of convection on the three-dimensional (3D) dendrite growth morphology. The detailed knowledge of the flow and tempe…
Removal of the carbon template from WS2-coated multi-walled carbon nanotube (MWCN) composites, produced WS2 nanotubes with intriguing microstructures. TEM characterisation shows that the intermediate phases of amorphous WO3−x-WS2 nanostructures, support the previously proposed growth model for WS2 nanotubes on MWCNs.
To solve a recent technical problem relating to larger-size wafer production and thinner packaging technology, a new photodefinable polyimide, which can give smaller wafer bow (curvature) after curing and also can attain finer pattern performance, is designed based on xanthene-structure dianhydride. This paper describ…
We constructed a hybrid piston cylinder-type high-pressure cell using a homemade NiCrAl alloy. It was designed as a hydrostatic pressure cell; 67 mm in length with an outer diameter of 25 mm to be used with a dilution refrigerator. We have succeeded in the resistivity measurement under hydrostatic pressure up to about…
S-sulfokeratein is prepared through S-sulfonation after the cleavage of disulfide bonds in keratin using ditiothreitol in urea. S-sulfokeratein is composed of two fractions, matrix and microfibril components, and S-sulfokeratein from the matrix component (Bs) can regenerate disulfide bonds. In this study, the effects…
To delineate the effect of Radiation Induced Surface Activity (RISA) on boiling phenomenon, surface wettability in high-temperature environment or Leidenfrost condition and critical heat flux (CHF) of oxide metals irradiated by gamma rays were investigated. When the temperature of the heating surface reaches the wetti…
Crossing of 38 clones of Nitzschia longissima (Breb.) Ralfs (Bacillariophyta) isolated from the coastal zone of the Black Sea near Karadag (Crimea) was carried out under laboratory conditions. This species is widely distributed in seas and oceans. It was shown that sexual heterogeneity is characteristic of the studied…
An air jet loom equipped with a profile reed and sub-nozzles is able to weave wider fabrics at higher speed than other types. A study on the characteristics of airflow and behavior of the weft yam in the weft passage area of the profile reed during inserting the weft yam is very important. The velocity distributions o…
A simple model of hydrogen diffusion and hydride precipitation was developed to estimate the radial re-distribution of hydrogen in zirconium-lined Zircaloy-2 claddings for light water reactors. Numerical calculation based on the model agreed well with experimental data and clearly showed that a slight difference of th…
In this paper, a computational simulation study is presented on the prediction of helium bubble evolution during repair welding of irradiated 304 stainless steel. Realistic spatial and temporal temperature and stress evolution during welding were obtained from simulation of the repair welding operation using the finit…
Optical second harmonic generation in Polyazomethine ether has been observed experimentally. The complete syntheses as well as the spectral analyses are made to establish the physical properties of polyazomethine ether as a stable polymer. Experimental studies using a nanosecond pulse Q-switched 1.06 ; m Nd:YAG laser…
The mechanical and dielectric properties of styrene butadiene rubber (SBR) reinforced with polyester (PE) short-fiber loaded with high abrasion furnace (HAF) carbon black in concentrations up to 60 phr have been investigated. The effect of ageing on these properties was also studied. It was found that the tensile stre…
Polymer-polymer interactions, such as hydrophobic and electrostatic interactions, were introduced into covalently crosslinked composite matrices consisting of an anionic polysaccharide, hyaluronic acid (HyA) and a cationic polypeptide, type II collagen. The matrices were covalently crosslinked using a water soluble ca…
The sensitization of Eu(III) and Tb(III) by ethylenediaminetetraaceticacid (EDTA)-derivatized tryptophan (Trp), 7-azatryptophan (7AW) and 5-hydroxytryptophan (5HW) has been examined. These Trp analogs were utilized in the present study because they can be incorporated into proteins in place of native Trp residues and…
Transpassive Dissolution Mechanism of Ni-Based Alloys in a Simulated Bleaching Solution : Effect of Alloying Elements , Betova, Iva, Bojinov, Martin, Kinnunen, Petri, Laitinen, Timo, Pohjanne, Pekka, Saario, Timo, Vilpas, Martti