Materials Literature
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Mn‐doped SrTiO 3 ‐based thin films have been prepared by a simple sol–gel spin‐coating method on silicon substrate. X‐ray diffraction and high‐resolution transmission electron microscopy reveal that these thin films are composed of amorphous and crystalline SrTiO 3 phases. Optical and electrical measurements indicate…
The objective of this research was to determine if a relationship could be found between dielectric strength and other properties of electrical insulating materials in the medium of liquid nitrogen on an empirical basis by using variables predicted by basic theory. A simple equation of the form E=A+Blog (rhov/xirtande…
Thermal aging and consequent embrittlement of materials are ongoing issues in cast and duplex stainless steels. Spinodal decomposition is largely responsible for the well-known “475°C” embrittlement that results in drastic reductions in ductility and toughness in cast materials. This process is also operative in welds…
We investigated the effects of etch rate on low- k damage induced by dry etching under CF 4 , CF 4 /O 2 , and C 4 F 6 /O 2 /Ar chemistry conditions. The amount of damage increases with decreasing etch rate in all chemistries. This is because the amount of fluorine or oxygen radical diffusion increases with plasma expo…
The scattering coefficient and the refractive index of sintered porous silicon are deduced from measurements on 1–4μm thick freestanding films. Mie’s theory is applied to describe the light scattering by the spherical pores. Using a reduced effective refractive index for the host medium in Mie’s theory accounts for th…
It is shown that the hydrodynamic form of nonlinear logarithmic Schrödinger equation (NLSE), in 3 + 1 dimensions, describes a solitonic flow of an isothermal, inviscid, compressible, capillary (Korteweg) fluid. This formulation corresponds to the so-called diffuse interface models used in hydrodynamics for two-phase f…
The synthesis is described of four new chiral liquid crystalline monomers (M2–M5 ) and their corresponding side‐chain homopolysiloxanes (P2–P5 ) containing menthyl groups. Chemical structures were characterised using FT‐IR or 1H NMR spectra, and specific optical rotations were evaluated with a polarimeter. The phase b…
Abstract The possibility to prepare bioinspired collagen nanofibers by electrospinning from aqueous suspension of telopeptide‐free collagen molecules avoiding both organic solvents and blends with any synthetic and natural polymers has been investigated. The results have highlighted the need for a basic atmosphere bet…
This study is part of a broad research project devoted to the “amphibole fibers environmental problem” as related to the proposed excavation of the Susa Valley railway tunnel. In this locality, tunnel excavations are planned through metamorphic formations containing amphibole asbestos minerals, and this may give rise…
Abstract The study addresses the effect of different conditions of carbon nutrition on synthesis of polyhydroxyalkanoates by the bacterium Wautersia eutropha . In experiments with two wild type strains (H16 and B5786), it has been first found that under mixotrophic growth conditions – CO 2 + co‐substrate (alkanoic aci…
The results of studying the pore size distribution of mesoporous silicon by NMR cryoporosimetry are described. These data are compared with the results obtained by adsorption methods.
The capillary pressure and liquid wicking in fibrous nonwoven materials depend on the structural arrangement of fibers in three dimensions, which is influenced by the method and conditions used to manufacture the material. By adapting the hydraulic radius mechanism and drag force theory, a model is established for pre…
This paper reports the results of an in situ HP synchrotron X-ray powder diffraction investigation on the natural zeolite gismondine (ideal chemical formula Ca 4 Al 8 Si 8 O 32 ·16H 2 O, space group P2 1 /c). The study was performed from P amb to 7.9 GPa, and upon decompression, using methanol:ethanol:water (16:3:1) m…
Chloride-bearing clasts from the Udachnaya-East pipe kimberlites, Yakutia, Russia, contain abundant to accessory rasvumite, KFe2S3, and djerfisherite, K6Na0-1(Fe,Ni,Cu)(24)S26Cl, which have been previously described in the groundmass of the host kimberlite. Rasvumite occurs in chloride-"nyerereite" and carbonate clast…
An advanced Monte Carlo software tool CHARIOT was developed to simulate image formation in SEM, energy deposition in EBL, electron spectra, and charging of a target.Scattering of an electron beam in a microstructure, generation of secondary electrons, and characteristics of the detector, as well as the material and sh…
All characterized major ampullate silks from orb-web weaving spiders are composites of primarily two different proteins: MaSp1 and MaSp2. The conserved association of MaSp1 and MaSp2 in these spider species, the highly conserved amino acid motifs, and variable ratios of MaSp1 to MaSp2 demonstrate the importance of bot…
A multiphase approach is used to study macrosegregation phenomena that occur during solidification of steel ingot castings. The goal is to enhance the understanding of different mechanisms of macrosegregation formation. 4 different cases are presented consecutively with increasing complexity of the model assumptions a…
Abstract This work aims to analyze, through weight loss and X‐ray photoelectron spectroscopy (XPS) methods, the inhibitive films of 1‐hydroxyethane‐1,1‐diphosphonic acid (1‐hydroxyethylidene‐1,1‐diphosphonic acid, HEDP) and zinc(II) ions formed on AISI 1020 carbon steel when immersed in solutions containing 30 ppm of…
Clay samples of hydrothermal origin from several oceanic spreading centers were studied using XRD, microprobe, infrared, and thermal analysis. They are talc, smectite, and mixed-layer talc-smectite (T-S) where the talc layers have several degrees of crystalline order. The smectite is trioctahedral in most cases, but t…
The high work hardening rate and ductility of high manganese austenitic steels is mainly attributed to the strong twinning induced plasticity (TWIP) effect found in the material. With a low stacking fault energy, mechanical twinning acts as a competitive mechanism to the more common dislocation glide. In order to unde…