Materials Literature
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Abstract Summary: A new diamine monomer containing a crown ether was made to react with commercial diacid chlorides and dianhydrides to yield new aromatic polyamides and polyimides. The crown ether moiety was introduced as a pendant group so that the polymers showed enhanced solubility in organic solvents, good therma…
The correlation between space charge accumulation and insulation failure has been investigated in four, polyethylene-based materials subjected to a DC field of 50 kV/mm. Two of the materials contained tree-retardant additives and all four materials were aged for extended periods up to 19,000 h. The specimens were remo…
The new orthorhombic meta-oxoborates RE(BO 2 ) 3 (≡REB 3 O 6 ) (RE = Dy-Lu) have been synthesized under high-pressure and high-temperature conditions in a Walker-type multianvil apparatus at 7.5 GPa and 1100 °C. They are isotypic to the known ambient pressure phase Tb(BO 2 ) 3 , space group Pnma. In contrast to Dy(BO…
Chitosan, poly-β-(1,4)-2-acetamido-2-deoxy-Đ-glucose ( N-deacetylated) was used as an adsorbent to adsorb the excess oil from oily wastewater. Chitosan is a biodegradable cationic biopolymer achieved by the extensive deacetylation of chitin obtained from prawn shell waste. Palm oil mill effluent (POME) is one of the m…
Gadolinium magnetic resonance contrast agents are known to interfere with some clinical chemistry tests, particularly colorimetric assays for serum calcium. We studied the effects of 4 agents, gadodiamide, gadoversetamide, gadopentetate dimeglumine, and gadoteridol, for interference with multiple serum assays. Gadodia…
Tourmaline has recently been shown to incorporate large amounts of substituent B at the tetrahedral site. To characterize the response of the tourmaline atomic arrangement to differing amounts of substitution of B for Si, five samples were separated from a core-to-rim (∼3 mm) section of an Fe-bearing olenite with a da…
Abstract The system Sn‐Beta/hydrogen peroxide is applied to the Baeyer–Villiger oxidation of delfone to δ‐decalactone, which is an industrial fragrance. The reaction is carried out without solvent and with a substrate/catalyst ratio>200 (wt/wt). Starting with an enantiomerically enriched delfone it is shown that th…
We report here about the effect of rare‐earth dopants on the improvement of room‐temperature mechanical properties of alumina. Rare‐earth ions (RE = Yb 3+ , Er 3+ , and La 3+ ) of different ionic radii in a minimum concentration of 1000 ppm were added as dopants individually to high‐purity alumina and densified by pre…
It is well known that radon emanation is affected by moisture. The models which explain radon emanation can be considered to come in three types. One is to predict the maximum possibility of radon emanation assuming uniform distribution of radium in a solid grain independent of moisture. The other two are to explain m…
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…