Materials Literature
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In this paper we analyze, with the help of density-functional theory calculations, the relationship between the molecular structure and the optical and vibrational properties of two narrow band gap π-conjugated co-oligomers containing an alternating sequence of aromatic donor and o -quinoid acceptor units. The optimiz…
Abstract Crystallization processes of the illite-smectite (I-S) mixed-layer mineral series during alteration of felsic vitric materials in volcaniclastic sediments through two drill holes (IT-2 and IT-8) near the Kakkonda active geothermal system, Japan, were examined by optical microscopy, scanning and transmission e…
6Wood, D. H., “A Three-Dimensional Analysis of Stall-Delay on Horizontal-Axis Wind Turbine,” Journal of Wind Engineering and Industrial Aerodynamics, Vol. 37, 1991, pp. 1–14. 7Cebecci, T., An Engineering Approach to the Calculation of Aerodynamic Flows, Springer, Berlin, 1999, pp. 51–62. 8Banks, W. H. H., and Gaad, G.…
Abstract The purpose of this study is to investigate the biaxial stretchability, the structure developed, molecular orientation and shrinkage of linear low‐density octene copolymers (LLDPEs) biaxially stretched using a laboratory biaxial stretcher. Seven resins having different molecular characteristics were used in t…
The number of protein crystal structures being refined to atomic resolution is increasing each year as well as the size of proteins being studied. There are currently 346 structures in the protein data bank which have been refined to or beyond atomic resolution. The benefits of atomic resolution X-ray data are discuss…
The conditions necessary for synthesizing aragonite by the carbonation process were investigated. Aragonite formation was found to have no relation to the pH value, the mole ratio of MgCl 2 /Ca(OH) 2 , or the magnesium/calcium ion concentration in a solution. The synthesis of aragonite requires a concentration of magn…
The gas tungsten arc (GTA) welding process is widely employed for fabricating duplex stainless steel (DSS) components. The microstructural phase balance is disturbed in DSS welds owing to the thermal cycles associated with welding and the desired phase balance is generally achieved either through control of heat input…
A new method for diffusion bonding nickel base and cobalt base superalloys has been developed, which is based on non-chemical oxide removal before the bonding process. Using this method, diffusion bonds were produced in nickel base and cobalt base superalloys with ‘virtually invisible’ bond interfaces and compositions…
Abstract Two polymerizable cationic surfactants, vinylbenzyl n‐alkyldimethyl (n = 12 or 18) ammonium chlorides, were used for functionalization of montmorillonite (MMT) and preparation of unsaturated polyester (UP)‐clay nanocomposites. Polymerizable organophilic clays were prepared by exchanging the sodium ions of MMT…
The paper reviews the physical properties of the R 1− x A x MnO 3 manganites ( R =La, Pr, Nd, Sm, etc., A =Ca, Sr, Ba) in the region of their electron doping where the divalent atom concentration x in the compound lies in the interval 0.5< x <1.0. Experimental magnetic phase diagrams of the most well-studied compounds…
Abstract Summary: The combustion performance of poly(butylene terephthalate) (PBT) can be improved by the addition of red phosphorus provided it is intermolecularly cross‐linked upon irradiation with 60 Co γ‐rays in the presence of triallyl cyanurate (TAC). At a content of 3 or 4 wt.‐% the latter significantly promote…
Abstract The hydrous calcium carbonate mineral ikaite (CaCO 3 .6H 2 O) forms in nature at low temperature in carbonate- and Ca-rich waters. Ikaite crystallizes in the spacegroup C2/ c , and consists of CaCO 3 .6H 2 O units with Ca ions coordinated by eight oxygens, six from H 2 O and two from the carbonate group. Hydr…
Abstract Novel columnar liquid crystals 5a – f bearing a dibenzo[18]crown[6] central unit have been prepared from bromodialkyloxybenzenes 1 and tetrabromodibenzo[18]crown[6] 2 via Suzuki coupling reactions. Differential scanning calorimetry (DSC) revealed that the length of the alkyl chains in the liquid‐crystalline c…
Abstract Two types of polypyrrol/molybdenum disulfide nanocomposites were prepared by means of in situ polymerization of the intercalated monomers. The nanocomposites were characterized by means of powder X‐ray diffraction, Fourier transformation infrared spectroscopy, scanning electron microscopy and transmission ele…
Liquid crystal technology has become, nowadays, one of the core technologies for implementing optical functions for WDM networks. Their advantage, with respect to other materials, is their unequalled engineering capability which is nowadays decisive in providing more flexible and cost effective systems. First, we brie…
Abstract Closed form solutions have been obtained for bubble dissolution in typical polymer melts encountered in rotational molding. The solutions are in excellent agreement with experimental data available in the literature. Using these solutions, it is shown that under typical rotational molding conditions the polym…
Tetraphenylmethane, tetraphenylsilane, and simple derivatives with substituents that do not engage in hydrogen bonding typically crystallize as close-packed structures with essentially no space available for the inclusion of guests. In contrast, derivatives with hydrogen-bonding groups are known to favor the formation…
Raman and infrared active modes of cerussite were assigned according to their symmetry species and compared to other aragonite group minerals. Small satellite bands at 823 and 1031 cm -1 on the low-wavenumber side of the fundamental vibrations ν 2 and ν 1 , respectively, have been assigned to the isotopic substitution…
Abstract Two reaction protocols are described which involve the use of polymer supports as reaction media for photooxygenation processes: 1) The use of polystyrene beads (PS) loaded with tetraphenyl‐ (TPP) or tetratolylporphyrin (TTP), swollen with the substrate in an appropriate organic solvent and subsequent irradia…
When an electrostatic probe is used to measure the surface charge on an insulating plate of constant thickness, the measuring system is regarded a shift-invariant system and the relation between the surface charge density and the probe output can be treated in the spatial frequency domain. The distribution of the surf…