Materials Literature
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The phase transitions in series of crystals with the general formulas A2BB’X6 (X=F, Cl, Br, or CN) and Pb2BB’O6 that belong to the elpasolite family (space group $$Fm\bar 3m$$ ) are analyzed. The influence of the size and the shape of cations and anions on the entropy and the mechanism of structural distortions is dis…
Novel segmented polyurethanes (SPUs) have been synthesized using hydrolyzed cellulose triacetate (HCTA) and 1,4-butanediol (BD) as diol component. By altering the molar ratio of HCTA to diphenylmethane diisocyanate (MDI), a series of polymers having poly(butadiene) (PBD) diol soft segments and varying content of HCTA…
Al2O3-coated graphite powder was prepared by a sol-gel method using ethyl acetoacetate aluminium diisopropoxide. An Al2O3-C castable refractory was prepared from the Al2O3-coated graphite powder. The flowability of this castable refractory was higher than that prepared from a graphite powder. The apparent porosity of…
Previously derived equations connecting the mechanical properties of plain woven fabrics with their geometrical parameters are introduced, and used to generate relations among the mechanical properties. One of these suggests a method of estimating the real shear modulus of the fabric, and this leads to a discussion of…
The macroporous PS–DVB resin was prepared in the laboratory by suspension polymerization using gelatin as stabilizer and toluene as porogen. This is subsequently nitrated by a mixture of NO and NO2 (called NOx) in a gas phase reaction, and the carbon–nitrogen covalent bonding has been demonstrated by modified Laissagn…
The generally accepted view that phosphonate derivatives are more potent than the analogous carboxylates as crystal growth modifiers for barium sulfate has been systematically studied by using trifunctional molecules varying from the triphosphonate through to the analogous tricarboxylate; the results suggest that pred…
A study has been made on the effects of Al, Si and Mo on anodic polarization characteristics of Fe–10Cr alloys in 0.05–1.0 kmol·m−3 H2SO4 and NaCl solutions. Potential decay curves have also been measured in order to evaluate the stability of the passive films formed on Fe–10Cr alloys containing Al, Si and Mo. The ana…
The ferroelectricity of perovskite oxide CdTiO3 was ascertained by the measurements of the dielectric constant, D-E loops, and pyroelectricity. The ferroelectric Curie temperature TC was about 80 K and the residual electrical polarization was 0.2 μC/cm2. Below TC , the temperature dependence of the lattice parameter a…
A silicone-containing epoxide named as EPSIB was prepared For silk crease-resist finishing. The major influence parameters for the synthesis of EPSIB were discussed. These treatments are shown to improve significantly both dry and wet resiliencies of silk with a good laundering durability. The shrinkage of finished si…
The Raman spectra of Na2O–Al2O3–SiO2 system with different Al2O3contents (up to 25 mol%) and with Na2O/SiO2ratio from 1 to2have been measured at 1 673 K.In the disilicate systems, the Raman spectra do not change significantly with increasing of Al2O3 content except the development of the 500 cm-1 band which is assigne…
The structure of a pentagonal quasicrystal, which has been called “basic Co-rich state of Al–Co–Ni decagonal quasicrystals”, in an Al72.5Co17.5Ni10 alloy annealed at 900°C for 40 hr has been studied by high-angle annular detector dark-field scanning transmission electron (HAADF-STEM). An observed HADDF-STEM image clea…
Three novel complexes, [Ag(S,S-1)][CF3SO3] (3), [Ag(S,S-2)][CF3SO3]·0.5H2O (4) and [Ag(R,R-2)][CF3SO3]·0.5H2O (5) [1 = 2,2-bis(4′-benzyloxazolin-2′-yl)propane, 2 = 2,2-bis(4′-phenyloxazolin-2′-yl)propane] were obtained from silver trifluoromethanesulfonate and the corresponding bis(oxazoline) ligands. The crystal stru…
In this thesis, a schematic model for the structure ofaggregated cellulose I fibrils is proposed. The model consistsof a crystalline fibril core surrounded by less orderedcellulose forms. These cel ...
The Solid State Energy Conversion Alliance (SECA) was initiated in the fall of 1999 to encourage the development of environmentally friendly solid oxide fuel cell (SOFC) modules for use with commonly available fossil fuels at low cost. In order to quickly achieve the necessary manufacturing volume to reduce costs to c…
Based on a plane-wave pseudopotential method,the electronic structure calculations of NaNO2 from first principles are perforined.The linear refractive indices and the static second-harmonic generation (SHG) coefficients are also calculated by the SHG formula improved by us.The calculated values are in good agreement w…
Pure magnesium powder was mechanically alloyed with SiO2 powder by using a planetary ball mill under an Ar atmosphere. After mechanical alloying, the powder was consolidated to the P/M material by vacuum hot pressing.
Paleosols, which are known as soils formed during the past climatic conditions, part of south India in Anantapur district of Andhra Pradesh are described here. Morphological properties of five pedons (P1 to P5} like depth, colour, structure, texture, presence of clay cutans, etc. and physical and chemical properties s…
Composites of mullite and zirconia were fabricated via the cyclic infiltration of porous zirconia‐based preforms with a liquid mullite precursor. The maximal amount of mullite precursor that could be infiltrated was dependent primarily on the initial open porosity of the preforms. When a zirconia preform with an initi…
Amplitude ratios of various reflected and transmitted elastic waves from a plane interface separating a viscous liquid half‐space and a micropolar elastic solid half‐space, are obtained in two cases (i) when longitudinal wave propagating through the solid half‐space is made incident at the interface and (ii) when “cou…
Calcification limits the long-term durability of xenograft glutaraldehyde (GA)-crosslinked heart valves. Previously, a study in rats showed that epoxy-crosslinked heart valves reduced lymphocyte reactions to the same extent as the GA-crosslinked control and induced a similar foreign-body response and calcification rea…