Materials Literature
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Abstract The origin of internal stresses in a polymeric component, subjected to an arbitrary cooling, will be described. The differential volume relaxation arising as a result of the different thermal history suffered by each body point was considered as the primary source of stresses build up. A numerical routine was…
In this work we investigate the influence of self-affine roughness parameters on the pull-in voltage in capacitive microelectromechanical devices. The capacitor plate roughness is considered as self-affine type, which is described by the roughness amplitude w, the lateral correlation length ξ, and the roughness expone…
For a better understanding of the relationship between the microstructure of UNS S31803 duplex stainless steel (DSS) and the shape of the polarization curves, this study evaluated the influence of the microstructure on the potentiodynamic polarization of the 850°C isothermal-aged UNS S31803 DSS in 0.5 M sulfuric acid…
In 2003, a joint research project entitled “Nano and graded thermoelectric materials/Photovoltaic-thermoelectric-wind power generation” is established in cooperation among research institutes from Japan and China. The major research institutes include State Key Laboratory of Advanced Technology for Materials Synthesis…
We investigate the structure of 1/3⟨111⟩ disconnections at Σ3 {111} twin boundaries in gold. Our high-resolution transmission electron microscopy (HREM) observations and atomistic simulations show that the core relaxation of this defect is dramatically affected by reversing the sign of the Burgers vector, as oriented…
A new coordination complex, [Zn(MCZ)3](NO3)2·H2O, was synthesized by the reaction of the aqueous solutions of zinc(II) nitrate and methyl carbazate. The complex was characterized by IR spectroscopy, elemental analysis and X-ray diffraction. It crystallizes in the monoclinic space group P2(1)/n. The central metal ion h…
a - Si : H ∕ Si O 2 multilayers prepared by plasma-enhanced chemical-vapor deposition exhibit a luminescence band around 760nm, which is quenched after a dehydrogenation process. Subsequent hydrogen plasma annealing (HPA) treatments are carried out, and the luminescence is then recovered. The effects of HPA are invest…
Methanol extracts were prepared from aerial parts of 8 medicinal plants and evaluated for their potential antiulcerogenic effects using ethanol and Aspirin-induced gastric ulcerations in rats. Oral administration of the methanol extract (400 mg/kg) of Bidens bipinnata Linn., Zygophyllum album Linn. f., Plantago major…
An advanced materials characterisation methodology has been used to examine systematically a range of sol-gel glass materials of contemporary biomedical interest. High energy X-ray total diffraction, X-ray fluorescence and Raman spectroscopy, and isotope-enriched O-17 and P-31 MAS NMR have been used to study the local…
Liquid crystal polymer (LCP) and Cu thin film cleaned with radio frequency (RF) plasma in a vacuum pressure of 3.0/spl times/10/sup -3/ Pa followed by Cu deposition on LCP were bonded at room temperature. Immediately after bonding, the samples were unloaded, heated in air, argon, nitrogen, hydrogen, and oxygen gases,…
We report the results of the first-principles calculation on the hydrogen storage material CaSi. The stability and bonding nature of CaSi hydride have been investigated theoretically with the ultrasoft pseudopotential method based on the density functional theory before experimentation. Theoretical prediction has sugg…
Abstract The crystal structure of the ordered double perovskite Sr 2 MnTeO 6 has been refined at ambient temperature from high resolution neutron and X‐ray powder diffraction data in the monoclinic space group I 1 2/m 1 with a = 5.6166(1) Å, b = 5.5807(1) Å, c = 7.8797(1) Å and β = 90.048(2)°. The structure is the res…
The impact of photodynamic processes induced by pump radiation in crystals doped with rare-earth (RE) ions on the possibility of generating stimulated radiation in the UV and VUV spectral ranges is analyzed. It is shown that, in addition to objective factors, one of the main causes preventing the lasing effect from be…
Extended abstract of a paper presented at Microscopy and Microanalysis 2005 in Honolulu, Hawaii, USA, July 31--August 4, 2005
The microscopic mechanism of appearance and evolution of pores and cracks is proposed to investigate the process of micropore nucleation in solids under impact and fixed loadings. The size distribution function and the critical size of pores are defined. The dependencies between the rate of pore nucleation and the rat…
We have investigated the change of the intercalated amount and conformational behavior of dodecyldiamine (C(12)H(28)N(2), di-C(12)amine) inside the confined space of the montmorillonite (MMT) intergallery at different pHs of the intercalation solution (H(2)O/ethanol/Na(+)-MMT/di-C(12)amine), and these results were com…
Dielectric measurements on molecular liquids just above the glass transition indicate that alpha relaxation is characterized by a generic high-frequency loss varying as ω −1/2 , whereas deviations from this come from one or more low-lying beta processes (Olsen et al. , Phys. Rev. Lett. 86 (2001) 1271). Assuming that l…
Natural rubber was reinforced with various concentrations of sisal and coir fibres. Green strength measurements were carried out to determine the fibre orientation. The rubber–fibre interfacial bond was improved by a resorcinol-hexamethylene tetramine dry bonding system. The composites were vulcanized at 150°C, and th…
A micro- or nanopatterned planar-aligned cell ordinarily requires a pair of mirror-image patterned substrates that must be aligned in register to ⪡1μm. As an alternative we examine the director orientation profile of a nematic liquid crystal in a cell composed of one substrate whose easy axis is patterned on micromete…
An inducible phenylserine aldolase (L-threo-3-phenylserine benzaldehyde-lyase, EC 4.1.2.26), which catalyzes the cleavage of L-3-phenylserine to yield benzaldehyde and glycine, was purified to homogeneity from a crude extract of Pseudomonas putida 24-1 isolated from soil. The enzyme was a hexamer with the apparent sub…