Materials Literature
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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…
A method to calculate the low frequency complex electric field in polluted insulators is proposed. The method is based on a quasi-static approximation which permits the decoupling of Maxwell’s equations. The method is implemented numerically through the finite element technique by defining a complex functional.
A long range attractive force occurs between freshly molten glass surfaces in water vapor. The attraction extends to distances of micrometers. The effect is more pronounced for low melting glasses with a high soda content. It is due to dissolution of the silica matrix components in vapor condensate which forms thick f…
Although the slag, which is secondary product of steel production, has become to be utilized in many ways, the ratio of utilizing reducing slag produced from electric arc furnace is still low because of its swelling character, for instance. To utilize reducing slag produced from electric arc furnace for the improvemen…
General properties of magnesium alloys with one or two different rare earth metals are briefly summarized and discussed. The regular trends observed in the intermediate phase formation are used to predict the characteristics of the room temperature isothermal section of the Gd-Y-Mg system. The partial experimental sec…
Spherical crystallization of asprin by solvent change methods was carried out in a crystallization system composed of acid buffer (pH 2.5), methanol and chloroform. The agglomerates contained salicylic acid less than the I.P. limits prescribed. Agglomeration process significantly improved the flow properties of the dr…
This paper investigates failure criteria used in modeling matrix failure in unidirectional and cross-ply laminates of ceramic matrix composites. In particular, the critical matrix strain energy (CMSE) criterion, as recently introduced by the authors, is examined in detail. In principle, a failure criterion, such as CM…
Mg–17~21 mass%Li–7.2~12.4 mass%Al ternary alloys were melted in order to improve the specific strength, and their heat treatment characteristics and tensile properties were investigated. Specific gravity of investigated alloys is in the range between 1.20 and 1.34, which is lower than that of the conventional Mg–Li al…