Materials Literature
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A new calculation method of atomic flux divergence (AFDgen) due to electromigration has recently been proposed by considering all the factors on void formation, and AFDgen has been identified as a parameter governing void formation by observing agreement of the numerical prediction of the void with experiment. In this…
A variety of alumina‐based ceramics were evaluated for dissolution in an azeotropic aqueous hydrofluoric acid test protocol at temperatures up to 200°C. Weight change measurements and microstructure analysis showed that HF corrosion in polycrystalline aluminas generally occurred at grain boundaries by the dissolution…
The effects of 1.5 MeV Kr‐ion irradiation on seven X 2 YO 4 phases with the olivine (A 2 VI B IV O 4 ), spinel (A IV B 2 VI O 4 ), and phenakite structures have been investigated using in situ and high‐resolution transmission electron microscopy (HRTEM) over a wide temperature range (20‐873 K). At low temperatures (&l…
Ceria‐samaria is one of the most interesting of fluorite oxides since its oxide ionic conductivity is higher than that of yttria‐stabilized zirconia and other oxides. In this study, the effective index is proposed to maximize the oxide ionic conductivity in based oxides. Considering the crystallographic character of f…
For a Na0.5B0.5TiO2 single crystal the intensity variation of the satellite reflection was measured by X-ray diffraction. No hystereses were observed for the phase transitions into both the rhombohedra1 and the tetragonal phases, however there is a coexistence of both phases in the range between ∼250°C and 300°C. By f…
Abstract A quantitative analysis of data from an in vitro assay presented allows for simultaneous study of cell migration within as well as cell traction on tissue equivalents (collagen gels seeded with tissue cells to serve as model tissues). Using our anisotropic biphasic theory for modeling tissue equivalents, the…
A novel acoustic method has been used to characterize the zeta potential and potential of zero charge in the pores of sulfuric acid anodized aluminum as a function of pH and concentration of oxo‐chromium(VI) compounds (those containing anions of chromate and dichromate). The results show that aqueous solutions of oxo‐…
Rice husk is produced in large quantities as a by-product of rice milling in rice-producing countries and has posed disposal problems in these countries. Disposal of or energy recovery from rice husk can be accomplished by thermochemical conversion processes (pyrolysis, combustion, and gasification). However, it appea…
To minutely understand the effect of foreign N-terminal residues on the conformational stability of human lysozyme, five mutant proteins were constructed: two had Met or Ala in place of the N-terminal Lys residue (K1M and K1A, respectively), and others had one additional residue, Met, Gly or Pro, to the N-terminal Lys…
The anaerobic corrosion of mild steel in seawater was studied by atomic force microscopy (AFM). In the presence of sulfate reducing bacteria (SRB), corrosion was intensified and accelerated. A biofilm consists of heterogeneous microbial cells and extracellular polymeric substance with interstitial voids was observed o…
Imposing to a single polymer chain of N monomers either a fixed pair of forces +/-f acting at the chain ends (stress ensemble) or a fixed end-to-end vector R (strain ensemble) does correspond to the use of different statistical mechanical ensembles. In particular, the two elasticity laws, R(f)=g(f) and f(R)=h(R), wher…
This paper reviews the nature of defects and optical centers in magnesium aluminate spinel. The identification of absorption and luminescence bands was used to investigate the influence of UV and electron irradiation on optical center formation. Crystals examined were nominally pure MgO‐ n Al 2 O 3 crystals with compo…
A refined expression for the secondary Bjerknes force between two spherical gas bubbles in a viscous incompressible fluid is derived, allowing for the dipole oscillations of the bubbles and acoustic streaming around them. The investigation is motivated by the fact that the existing theory [see, for example, E. A. Zabo…
This paper presents a review of leakage current (Lc) measurements on nonceramic insulators and material samples. It is divided into two parts: First, the field investigations of LC, include a development of LC measuring systems and how the on-line LC measurements correlate to the insulator performance as well as to th…
A conjugated polymer−redox polymer hybrid based on the complexation of poly[2-(2-pyridyl)bibenzimidazole] with bis(2,2‘-bipyridyl)Ru 2+ has been prepared to take advantage of electronic communication between metal centers through the conjugated backbone. The existence of such communication is confirmed by the observat…
Kinetics of the development of a conversion coating from a stannate bath on commercial purity magnesium (Mgcomm), magnesium-based alloys ZC71 and WE43, and a metal matrix composite (MMC), comprising a ZC71 alloy matrix and 12 vol% silicon carbide (SiC) particles were studied using linear polarization resistance, poten…
Abstract Extensive hydrothermal alteration is observed around volcanogenic massive sulfide deposits. These deposits are related to Late Cretaceous volcanism in various parts of the Eastern Pontide province. Mineral assemblages resulting from alteration consist of mostly clay minerals and silica polymorphs, some sulfat…
The syntheses and structures of the two mixedvalence crystalline molybdenum blue compounds Na26[Mo142O432(H2O)58H14] · ca. 300 H2O (1) (containing the maximal number of well defined defects which influence the overall structure and the reactivity of the anionic cluster) and Na16[(MoO3)176(H2O)63(CH3OH)17H16] · ca. 600…
Abstract The results of an experimental study on the effect of processing variables and filler concentration on the electrical resistivity of conductive composites based on nylon 6 filled with carbon black are reported. A typical percolation behavior in the effect of electroconductive filler content on the resistivity…
Thermogravimetry, derivative thermogravimetry (TG, DTG), differential scanning calorimetry (DSC) and X ray diffraction powder patterns have been used to study trimethoprim, sulfamethoxazole, ampicillim, tetracycline hydrochloride and rifampim. The results revealed the extent of their thermal stability and also allowed…