Materials Literature
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The symmetry groups of double-wall carbon nanotubes (DWCNs) are the line and point groups for the commensurate and incommensurate walls, respectively. For the tubes with diameters between 2.8 Å and 50 Å all possible DWCNs are found. Among them all the 318 commensurate DWCNs are singled out and their symmetry groups ar…
We have investigated the effect of carbon addition on the structure and magnetic properties of melt-spun Sm(Co 0.9 Fe 0.1 ) 6.8 Zr 0.2 C x ( x = 0, 0.03, 0.06, 0.09 and 0.12) ribbons. The samples mainly have a single TbCu 7 structure. The added carbon helps formation of a microstructure with fine and homogeneous grain…
Undercooled melt was produced in the alumina‐rich portion of the Al 2 O 3 –Y 2 O 3 system, heating the metastable eutectic structure to above the metastable eutectic temperature but below the equilibrium eutectic temperature, followed immediately by solidification along the equilibrium path in the undercooled melt. Co…
Surfaces of nano-silica particles can be effectively modified by means of irradiation graft polymerization. When polypropylene (PP) was compounded with these treated nanoparticles, an overall improvement in the mechanical properties of the composites at rather low filler content was acquired. The present work observed…
Abstract Three new extended iron‐containing heteropolytungstates were synthesized and structurally characterized: K 6 [{Fe II (H 2 O) 4 } 2 (H 2 W 12 O 42 )]·15H 2 O ( 1 ), Na 5 [{Fe(H 2 O) 3 } 2 {Fe(H 2 O) 4 } 0.5 (H 2 W 12 O 42 )]·30H 2 O ( 2 ) and (H 3 O) + 2 [{Fe(H 2 O) 4 Fe(H 2 O) 3 } 2 (H 2 W 12 O 42 )]·20H 2 O…
The effect of mimosa tannin on the electrochemical behavior of carbon steel (CS) in borate buffer solution (pH 8.4) was studied using potentiodynamic and electrochemical impedance spectroscopy techniques. Mimosa tannin was found to increase the dissolution rate of CS in the active range by forming a soluble iron(II) t…
The tensile strength and energy absorption for dissimilar metal friction welds between 6061-T6 Al alloy and type 304 stainless steel at high rates of loading were determined using the split Hopkinson bar. Cylindrical tensile specimens machined from as welded butt joints of 13 mm in diameter were used in both static an…
Abstract The application of a Monte‐Carlo (MC) algorithm to account fully for loop formation in RA 2 + R′B 3 and RA 2 + R′B 4 polymerizations is described. The resulting interpretation of experimental elastic moduli of HDI‐based polyurethane networks prepared at different dilutions shows it is essential to account for…
Abstract The goal of the investigation presented here was to evaluate the influence of semifluorinated side chains on the bulk structure and the surface properties of polysulfones with different chain structure. Thus, segmented block copolymers consisting of polysulfone and semifluorinated aromatic polyester segments…
Two series of liquid crystalline cyclic siloxane tetramers, one containing the 2-methylbutyl chiral group and the other the 1-methylheptyl chiral group, were prepared to investigate, in a systematic manner, the role of molecular structure of (a) the spacer group, (b) the mesogenic side chain and (c) the chiral end gro…
While it is acknowledged that roll wear is one of the most challenges to hot strip mills (HSM), very few studies which detail an exact prediction model have been published. The aim of this work is to evaluate and compare two prediction models with measured roll wear. The first prediction model, model 1, developed for…
Abstract A semiempirical PM3 quantum computational method has been used to generate the electronic and optimized geometrical structure of SWNT of zigzag and armchair types. We shed light on the electronic structures of SWNT with various diameters and lengths of the tube. Particularly, the calculated HOMO, LUMO and ban…
For over fifty years companies have been performing partial discharge measurements on electric equipment in order to obtain information as to the quality of insulation on operating equipment. Partial discharge activity is a well-accepted indicator of insulation deterioration. Consequently, trending of partial discharg…
The distribution of luminescent Eu 3+ ions in crystals with the cubic bixbyite-type structure is subject of debate. In this work, the actual occupancy of the two cation sites available for europium in yttria and lutetia nanocrystals with sizes of 10 - 20 nm has been evaluated by means of 151Eu Mössbauer spectroscopy.…
Günter Reiter and Jens-Uwe Sommer (eds.) Springer-Verlag (2003), 386 pp. ISBN: 3-540-44342-8 $67 / €72.95
In this study a new model for calculating shielding requirements in diagnostic X-ray facilities is presented. It is based on the combination and modification of models and concepts originally proposed by other authors in order to calculate barrier requirements in diagnostic X-ray facilities accurately and realisticall…
For the first time, direct experimental evidence of a new mechanism for the quenching of fluorescence of organic ligands (L) in complex compounds with lanthanide ions (Ln3+) is obtained. By analogy with the mechanism of luminescence quenching upon pair interactions of Ln3+ ions in inorganic systems, this mechanism is…
In this paper, the infrared optical properties of diamond films grown on silicon substrates by means of the microwave plasma chemical vapour deposition (MPCVD) method were first studied by infrared spectroscopic ellipsometry in the photo energy range of 0.1–0.4 eV. Using the effects of annealing treatment on the extin…
Powders of yttria–alumina materials YAlO3 (YAP) and Y3Al5O12 (YAG) have been prepared from commercially-available preformed sols, and the products were compared with those from preformed sol-nitrate, nitrate-citric acid and alkoxide methods. The preformed sol route offers an alternative cheap and rapid method, and dif…
Shrimp shell waste from seafood restaurants and canned shrimp industries is potential to be used as chitosan source. This material contains 18.1% of chitin which could be converted into chitosan through demineralization, deproteination and deacetylation process. Chitosan is fine chemical used to adsorb fat from body,…