Materials Literature
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The assignments of FTIR and Raman spectra of poly (vinyl alcohol) (PVOH) and four ethylene vinyl alcohol (EVOH) copolymers 72, 59, 44, and 32mole% of ethylene group, has been performed by in-situ measurements and deconvolution analysis. By comparing with the spectra of high-density polyethylene, the bands in the regio…
Abstract In adiabatic vacuum and dynamic calorimeters the temperature dependence of the heat capacity C p 0 of tetrahydro‐1,3‐oxazin‐2‐one (THO) and poly(oxy‐1,3‐propanediyliminocarbonyl) (PTHO) was studied between 5 and 500 K. The melting temperature of the monomer and the polymer, the enthalpies of melting of THO an…
To integrate irreconcilable material properties into a single component, novel engineered materials termed ‘surface composites’ have been developed. In these engineered materials, the second phase is spatially distributed in the near surface region, whereas the phase composition is linearly graded as a function of dis…
Vector hysteresis models are generally regarded as helpful tools that can be utilized in simulating multi-dimensional field-media interactions. In this paper, simulation of vector hysteresis is proposed by using a superposition of isotropic Preisach-type models. This approach gives the opportunity to fully incorporate…
XLPE power cables were introduced in Norway by Alcatel Kabel Norge AS in 1968. The standard XLPE construction sold to the Norwegian electric utilities today is an axially and radially watertight power cable construction presented in 1991. The objective of this paper is to summarize test results that show the developme…
EXAFS is used to study changes in local structure which occur on doping at the B site in two related perovskite oxides, SrSn 1-x Sb x O 3 and BaPb 1-x Bi x O 3 . In the case of the stannate, data is taken at the Sr K, Sb K and Sn K edges. A combination of near-edge XAS and EXAFS measurements show that Sb dopes into th…
The cation exchange capacity (GEC) of soil is an important criteria for assessing soil fertility beside its use in soil classification. Seven methods, namely, (1) BaCl2 - triethanolamine of BaCl2 - TEA (PH 8.2), (2) NH40Ac (PH 7.0) - leaching, (3) NH40Ac (PH 7.0) - shaking, (4) compulsive exchange method of Gillman (1…
The clinical results of biological vascular grafts have been unsatisfactory. The poor results of these vascular grafts may be attributed to the fixatives, aldehydes, used in fixing tissues. In an attempt to overcome this problem, a new fixative, epoxy compound, has recently been used to fix biological vascular grafts.…
Pure mullite, with and without small amounts (=2%) of transition metal ions (Mn, Fe, Cr, and Tl) as dopants, has been synthesised by coprecipitating the hydroxides of Al, Si, and the dopant with ammonia. Water soluble salts and organometallic compounds were used as starting materials. The coprecipitates were calcined…
The primary alcohol groups of four kinds of polysaccharides (com starch, rice starch, sweet potato starch, and cellulose), with different structures and water solubilities, were oxidized to carboxyl groups using 2,2,6,6-tetramethyl-1-piperidine oxoammonium ion (TEMPO) at . The optimum pH, TEMPO content, and NaBr conte…
A structure consisting of four penetrable wedges with a common edge is considered. For a certain polarization and direction of incidence of the primary plane wave, the edge does not scatter and geometrical optics is the exact solution. Two derivative structures are described that also do not scatter-one consisting of…
A small series of merocyanine dyes has been synthesized in which substituents are incorporated into the polymethine backbone. The substituent perturbs the local structure in the polyenic bridge, as evidenced by changes to the bond order, the valence electronic charge on certain bridging carbon atoms, the bond length a…
Abstract
Single crystals of Ba2Li2/3Ti16/3O13 have been isolated and its crystal structure solved from X-ray diffraction data. The structure is similar to that of Ba2Ti6O13and Na2Ti6O13 [monoclinic, space group C2/m (no.12), a=15.171(13), b=3.8992(18), c=9.106(4) Å, β=98.64(6)°, Z=2], but one of the three independent octahedra…
The spectroscopic properties of two phenylethynylbenzene derivatives capable of forming nematic discotic (N D ) liquid crystals are studied in solution and in their N D phase. Their electronic absorption spectra are analysed with the help of fluorescence anisotropy measurements and on the basis of a previous theoretic…
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Bis(4,5-disulfanyl-1,3-dithiol-2-onato)nickelate anion complexes [Ni(C 3 S 4 O) 2 ] 2- were prepared. A single- crystal structure analysis has been performed for the bis(tetraethylammonium) salt 1: orthorhombic, space group I4(1)acd, Z = 8, a = b = 19.605(3), c = 16.217(5) Å. Full-matrix least-squares refinement based…
In the present investigation, chemical hardness and electronic chemical potential for isomers of different molecules were studied by taking into account the principle of maximum hardness. Different isomers of the molecules, XC(O)OX (X=F, Cl), C2H3NO, C2H2, and HCNC, were considered for the above investigation. In most…
The introduction of large amounts of hydrogen into low-carbon steel specimens by cathodic polarization produces hydrogen damage such as blisters, microcracks and dislocations. Hydrogen exists in the specimens as atoms dissolved in the iron lattice, as atoms trapped at lattice defects such as dislocations, and as gas p…
Several novel tiacumicin derivatives containing bromine have been produced by the addition of inorganic bromine to the fermentation broth of Dactylosporangium aurantiacum subsp. hamdenensis. Structures were elucidated employing mass spectrometry and NMR spectroscopy. Antibacterial activity of the bromotiacumicins is c…