Materials Literature
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It is important to stress that XRD must not be used as a &s;black box&s; to characterize cementitious materials. Ordinary Portland cement (OPC) is not made from pure minerals but from quarries that generally contain substantial amounts of impurities. Thus, the alite component of Portland cement is not pure C^S but is…
Abstract The crystal structure of Cu 4 Bi 4 Se 9 , synthesized at 400 °C, was determined from single crystal X-ray diffraction data and refined to the R 1 value of 0.05. The compound is orthorhombic, with a = 32.692 Å, b = 4.120 Å, and c = 12.202 Å, space group Pnma . The structure contains three square pyramidal Bi s…
This is an electronic version of the revised U.S. Air Force Damage Tolerant Design Handbook. The technical content of the 2002 edition is enhanced by the addition of new developments in the areas of corrosion, widespread fatigue damage, and probabilistic methods. New sample problems are included which illustrate the s…
Fluorescence quantum yields and luminescence spectra for solid samples are presented and interpreted. Re-absorption of the emitted light is very important in these systems causing a decrease in the observed luminescence quantum yield as well as distortions in emission spectra (usually a shift to longer wavelengths). T…
Dislocation motion in short-range-ordered solid solutions under stress are investigated in situ by transmission electron microscopy. For the first time, local reordering created by the back slip of mobile dislocations is proven to exist. Dislocation movement within pile-ups produces local disordering by forward slip d…
The effect of rim structure formation and external restraint pressure on fission gas release at transient conditions has been examined by using an out-of-pile high pressure heating technique for high burnup UO2 fuels (60, 74 and 90 GWd/t), which had been irradiated in test reactors. The latter two fuels bore a develop…
Abstract Blends of 75/25 poly(ethylene terephthalate) (PET)/high density polyethylene (HDPE) containing poly(ethylene‐co‐methacrylic acid) partially neutralized with lithium (PEMA‐Li) were obtained by direct injection molding in an attempt (i) to ameliorate the poor performance of the binary blend and (ii) to find the…
Impedance spectroscopy was used to study the temperature dependence of the resistance and capacitance of niobium‐doped strontium titanate ceramics and also to identify the main contributions determining potential applications. Nyquist plots ( Z ″ versus Z ′) show a main contribution in the intermediate‐frequency range…
We report on the transport characteristics of individual multiwalled carbon nanotube/nanofibers (MWCNTs) grown by plasma-enhanced chemical vapor deposition (PECVD). The measurements were performed on individual MWCNT nanobridges suspended by sputtered Nb contacts. Temperature dependent measurements of conductance reve…
Abstract A reinforced trouser tear test was developed to evaluate the tear resistance of thin ductile films. Tests with blown film of linear low‐density polyethylene blended with up to 30 wt% of a high melt strength polypropylene (hmsPP) demonstrated that the test differentiated among films based on composition and th…
Reaction of Ce(NO 3 ) 3 ·6H 2 O and 1,10-phenanthroline in CH 3 OH / H 2 O afforded the title compound [Ce(phen) 2 (H 2 O) 2 (NO 3 ) 2 ](NO 3 )(phen) 2 (H 2 O), which consists of [Ce(phen) 2- (H 2 O) 2 (NO 3 ) 2 ] + complex cations, NO 3 - anions, phen and crystal water molecules. Within the [Ce(phen) 2 (H 2 O) 2 (NO…
Several formulations of the differential theory for anisotropic gratings are investigated numerically. Conventional formulations and recent formulations based on Li's Fourier factorization rules are applied to a sinusoidal-profiled grating made of an anisotropic and conducting material. For both types of formulation,…
Diagenetic illite (mixed layer illite-smectite, I-S) from Ordovician and Devonian potassium bentonite (K-bentonite) and shales was studied in the proximal southern Appalachian Basin (Alabama through Virginia) to understand in more detail the timing of illite formation as well as attempt to describe the chemistry of th…
Abstract Styrene–butadiene rubber (SBR) vulcanizates with graded network chain densities were prepared by a conventional method of rubber science and technology. The characteristics of the gradient and gradient direction of the network chain density were examined from the perspective of the mechanical properties of th…
A water-soluble bifunctional polyurethane WPU200 is prepared and used for wash-and- wear finishing of silk fabrics. The wet resiliency of the finished silks greatly improves, and dry resiliency drops a little. Anionic and nonionic softeners, which can improve the dry crease recovery angle and handle of finished silk f…
Abstract A method of estimating the dependency of the relative viscosities and average sedimentation velocities of particle dispersions on the particle packing behavior, which is related to the shape (sphericity or aspect ratio) of the particle and the ruggedness of the particle surface is proposed. For each ensemble…
Ultrafine‐grained monoclinic ZrO 2 polycrystals (MZP) and 3‐mol%‐Y 2 O 3 ‐stabilized tetragonal ZrO 2 polycrystals (3Y‐TZP) were obtained by hot isostatic pressing (HIP). Both MZP and TZP were “high‐purity” materials with impurities less than 0.1 wt%. The deformation behavior was studied at 1373 K, which was lower tha…
The mechanism of formation of fragmented (banded, block) dislocation structures (FDSs) in crystals subjected to large plastic deformations are discussed. The theoretical analysis is based on the kinetic equations for the density of geometrically necessary dislocations (GNDs). The equations include the processes of mul…
The oxidation behaviour and strength degradation of a Yb2O3−SiO2−doped hot-pressed silicon nitride ceramic were investigated in air for up to 100 h at temperatures between 1200 and 1500°C. The parabolic weight gain versus oxidation time was measured. The oxidation products consisted of Yb2Si2O7 and SiO2 (α-cristobalit…
An investigation of the reactions of metallo-5-nitro-2,3,7,8,12,13,17,18-octaethylporphyrins with Grignard reagents, benzyl oxide, phenoxide and benzenethiolate nucleophiles shows that, except for benzenethiolate reactions, they are less efficient than related reactions of metallo-2-nitro-5,10,15,20-tetraarylporphyrin…