Materials Literature
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As a new method for maximizing yarn and fabric strengths, an exploratory blending experiment is completed in a 4-week period by processing 2117 bales of three different cottons in a textile mill to produce 94.4 tex (6.3/1 Ne) open-end spun yarns, and weaving them into a denim fabric. Bale selection is done in such a w…
The atomic coordinates of K 2 (NbO) 2 Si 4 O 12 reported in space group P 4 bm satisfy the structural criteria for ferroelectricity. The estimated phase-transition temperature, T c = 2230 (250) K, is substantially in excess of T melting = 1476 (5) K; the hypothetical paraelectric phase in space group P 4/ mbm is hence…
Abstract The Polar Satellite Launch Vehicle (PSLV) makes use of hydroxy terminated polybutadiene (HTPB) based solid propellant in the booster stages, strap‐ons, and the third stage. An empirical model that describes the change in viscosity of various formulations of propellant slurry with time and temperature has been…
Epitaxial growth of YBCO thin films with a MgO buffer layer on Si[100] substrate is reported. The MgO thin film was deposited by RF magnetron sputtering, using a single crystal MgO target. The crystallization of the MgO thin films was found to be dependent on the substrate temperature and the sputtering gas mixture. T…
The complexes of the composition [Ln(PMVP)3.Hp.C2H50H].H20 (where Ln = trivalent lanthanides such as La, Ce, Nd, Sm, Gd, Dy, Er and PMVP = l-phenyl-3-methyl-4-valeroyl-2-pyrazoline-5-one) have been synthesised. These have been characterised on the basis of elemental analyses, conductance, magnetic measurement, electro…
Buildup of scale in the kraft digester and black-liquor evaporators is a major contributor to lost pulp mill productivity. Scale deposition occurs in areas such as the heaters and extraction screens of continuous digesters and the liquor side of heat-transfer surfaces in the evaporators. This reduces the efficiency an…
The reduction of NO by CO on Pt has been extensively investigated in the past since it helps to eliminate NO of the exhaust gas of cars. However, the dissociation of NO in this reaction and the deactivation of the NO/CO reaction on Pt-supported catalysts still need to be discussed. In this work, the reduction of NO wi…
Abstract The clay mineralogy of an oxisol-saprolite overlying serpentinite and underlying basalt was studied with different techniques to evaluate the clay mineral transformation that occurred and to understand the origin of Fe 3+ -rich smectite. The saprolite zone of the oxisol, up to 30 m thick, contains smectites o…
Abstract The deuteration technique was used to assign unknown infrared (IR) bands of Ge-bearing talcs. Procedures to achieve partial or complete H/D replacement in synthetic Ge-bearing (Mg, Ni and Co)-talcs have been investigated. From the spectral shift of IR absorption bands in the 4000–300 cm -1 region resulting fr…
This paper reports the Ferroelectric and Piezoelectric properties of lanthanum doped lead barium niobate ceramics with formula Pbx-3y/2 Ba1-x Lay Nb2 O6. Piezoelectric properties showed a strong enhancement at morphotrophic phase boundary between tetragonal and orthorhombic phases. d33 value of 350 pc/N obtained is hi…
A model of the ice proton system taking into account quantum-mechanical tunneling of protons along hydrogen bonds has been formulated and investigated. When the tunneling amplitude is small the quantum ground state of the proton system is degenerate, like the classical ground state. At higher tunneling amplitudes, how…
The room-temperature crystal structure of the B-site ordered complex perovskite strontium ytterbium niobate, Sr(Yb(0.5)Nb(0.5))O(3) [monoclinic, Z = 2, P2(1)/n (set 2), a = 5.79095 (8), b = 5.82210 (7), c = 8.20358 (12) Å, beta = 90.126 (1) degrees, with final R(wp) = 0.0595, R(Bragg) = 0.0203 for the neutron profile…
Abstract The influence of sodium oleate additives on processing and morphology of polypropylene ‐ co ‐polyamide (PP/CPA) mixture melts has been investigated. It is shown that sodium oleate is located in the interphase of the components and acts at small additives (up to 3 wt%) as an interfacial tension agent, improvin…
This study proposes a new approximating formula for calculating gamma-ray buildup factors in multilayer shields. The formula combines the buildup factors of single-layer shields with products and quotients. The feasibility of the formula for reproducing the buildup factors was tested by using point isotropic buildup f…
The structure of a topological dipole (two nematic point defects with opposite charges) is considered theoretically both in an infinite space and in a capillary. It is shown that the Frank elastic energy tends to concentrate within a spheroidal string if the defects are not too far from each other. The string thicknes…
Polysulfone was modified by incorporation of hydrophilic poly(oxy-1,4-butanediyl) [synonyms: poly(tetramethylene ether glycol), PTMG, poly(tetrahydrofuran), poly(THF), poly(tetramethylene oxide)] units into the polysulfone chain resulting in the formation of segmented block copolymers. These block copolymers were prep…
A recently developed method for fitting a Monte Carlo computer simulation model to observed single-crystal diffuse X-ray scattering has been applied to ( hk 0) scattering data obtained for the guest–host system (inclusion compound) cyclohexane–perhydrotriphenylene (cyclohexane–PHTP), C 6 H 12 /C 18 H 30 , at 295 K. A…
Susceptibility to radiation of rare-earth elements and transition metals in Y3Al5O12, YAlO3, LiNbO3, SrGdGa3O7 single crystals was investigated. Additional absorption bands after g-irradiation with doses 103-107 Gy and protons with fluencies of 1013-1016 cm-2 were found. A decrease in additional absorption with increa…
We report 17 O magic-angle spinning (MAS) NMR data for crystalline NaAlO 2 and CaAl 2 O 4 at external magnetic fields of 9.4 and 14.1 T, as model compounds for Al-O-Al sites in tetrahedral networks. The former contains one peak with isotropic chemical shift (δ iso ) = 30.9 ppm and quadrupolar coupling constant (C Q )…
The electronic structure of perovskite manganese oxides is investigated in terms of a Kondo lattice model with ferromagnetic Hund coupling and antiferromagnetic exchange between ${t}_{2g}$ spins using a finite temperature diagonalization technique. Results for the dynamic structure factor are consistent with recent ne…