Materials Literature
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The thermal conductivities of alkali silicate melts containing fluorides have been determined using the non-stationary hot wire method. Measurements were carried out over the temperature range 1050–1550 K on the following six samples: Li2O–2SiO2, Na2O–2SiO2, 0·7Li2O–0·6LiF–2SiO2, 0·9Na2O–0·2NaF–2SiO2, 0·7Na2O–0·6NaF–2…
Austempering kinetic measurements and mechanical property measurements are reported for two Mn ductile irons with and without Co and three austempering treatments. It is shown that Co accelerates the stage I reaction in each of the irons and for each of the austempering treatments but has little affect on the stage II…
The paramagnetic complexes ( FPc )( Me ) Rh - (4) and (FPc)( PMe 3 )( Me ) Rh - (10) have been prepared by reducing ( FPc )( Me ) Rh (1) and ( FPc )( PMe 3 )( Me ) Rh (2) with NaBH 4 in methanol-d 4 [ FPc 2- = dianion of 1,4,8,11,15,18,22,25-octakis(trifluoromethyl)phthalocyanine]. Compounds 4 and 10 are further reduc…
The effect of synthesis conditions on the size and morphology of boehmite particles in the sol produced by hydrothermal processing has been investigated. Transmission electron microscopy, X-ray diffraction and Laser particle size analysis were used to characterise the synthesized boehmite. Results show that the initia…
Following the discovery of X-rays by Röntgen in 1895, three major fields of materials investigation and analysis developed. Röntgen already demonstrated the first of these--radiography--in his first publication. The second, X-ray emission spectroscopy, has its roots in the 1910s, but was rediscovered as X-ray fluoresc…
Abstract This paper considers the effective properties of cellular materials. The present approach and some earlier proposed methods are compared and discussed. The main effort is placed upon the continuum mechanics approaches' ability to predict effective elastic properties. It is shown that two methods are distinctl…
The impact of organic compounds on iodine volatility was investigated under a range of postaccident chemical conditions expected in a reactor containment structure. The rate of production of volatile iodine was evaluated in the presence of 10-3 M concentrations of carbonyl, alkyl halide, and aromatic compounds. A benc…
Ferroelectric domains of the tetragonal (Pb0.985Bi0.01)(Ni1/4Zn1/12Nb2/3)0.2(ZrσTi1−σ)0.8O3 (σ=0.30 and 0.40) ceramics were investigated by transmission electron microscopy and electron diffraction. It was observed that the 90° macrodomains displayed the shape of simple lamella twinning, and that the δ-fringe contrast…
The activity of inorganic substrates in the catalysed nucleation of polymer melts was studied using a nonisothermal differential scanning calorimetry technique (DSC). The analysis of the results was made by using the method developed by Dobreva-Veleva et al.1). In this method the kinetics of nonisothermal overall crys…
We have synthesized carbon chaplets in nanometer-scale size consisting of a nanotube bearing beads by catalytic thermal chemical vapor deposition. The catalyst is a patterned, layered thin film of iron and indium (Fe/In) that is coated indium tin oxide. The bushlike chaplets grow on both Fe/In-coated and Fe/In-uncoate…
Elastic fabrics used to make pressure garments are normally cut in various sizes and different aspect ratios ( i.e., width of fabric divided by gauge length). Because the aspect ratio may vary the load-strain relationships measured from the elastic fabric, the resultant pressure of a tubular elastic fabric exerted on…
An attenuated total reflectance (ATR) permeation cell has been used to evaluate the permeation of polymer samples from chemical protective clothing (CPC), mainly gloves, by several chemical types including a solvent, a commercial pesticide mix, and a volatile solid. Good contact between sample and ATR crystal was ensu…
Abstract The rate of the morphology development of immiscible polymer blends is closely related to the rates of melting of the polymer constituents. A two‐zone model was developed to describe the rate of melting of the polymer pellets of mixtures of two semicrystalline polymers in an internal batch mixer. The mixing c…
Two different silicon nitride powders, one produced by self‐propagating high‐temperature synthesis (SHS) and one commercial, have been equally processed to obtain dense materials. Y 2 O 3 powders as a sintering aid and hot‐pressing techniques were used to process the materials. The fracture toughness and strength of t…
ZrO{sub 2}-SiO{sub 2} sol-gel powders were produced using tetraethoxysilane (TEOS) and zirconium propoxide. After gellation, the ZrO{sub 2} crystallization process was investigated using X-ray diffraction (XRD), thermal analysis (DTA/TGA), and scanning electron microscopy (SEM). Fresh gels were amorphous. Thermal trea…
Abstract Molecular dynamics (MD) simulations have been performed for several pure alkali nitrate melts. Special attention was paid to the examination of the interaction potential: macroscopic quantities like pressure were calculated and compared with real values. To improve the results the commonly used potential for…
The stitch formation process of a lockstitch sewing machine has been investigated with the aid of transducers which facilitate real-time monitoring of the sewing cycle. It has been found that increasing the travel of the check-spring by three millimetres from the normal position significantly reduces needle thread con…
The paper reports on an ESR study of Cr-and Ca-codoped SrTiO 3 films, 1700 and 350 nm thick, before and after UV irradiation (λ=365 nm). The spectrum of the thick film (1700 nm) exhibits two ESR lines with g factors of 1.977 and 1.974, which belong to the Cr 3+ centers. In the spectrum of the thin film (350 nm), one o…
This study examined the influences of stitch density on the strength, extensibility, and stress withstand retention of three stitch types commonly used for knitted fabrics. With experimental and theoretical analyses the patterns of changes in various stitch structures brought about by the increase of stitch density we…
Derivative thermograms (DTG) for the desorption of dimethylformamide (DMF) from M n + −SWy−2/DMF complexes can be used to distinguish between different exchange cations simply by the temperature at which the most strongly held DMF molecules are desorbed. The maxima for the desorption of this strongly bound DMF in the…