Materials Literature
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We have investigated the complex ac conductivity of for , temperatures and frequencies . In addition, results from dc measurements are presented. From the frequency dependence of the complex conductivity we find hopping of Anderson-localized charge carriers as the dominant transport process in certain temperature and…
It is shown that certain regions of commercially available 500 kV non-ceramic insulators have surface electric fields that are above the threshold for water drop corona. Observations made in a full scale accelerated aging chamber, and in service, demonstrate that water drop corona occurs on such insulators. A correlat…
Readily available R8Si8O12 frameworks react selectively with aqueous Et4NOH to afford discrete incompletely-condensed silsesquioxanes: reaction of R8Si8O12 (2a, R = c-C6H11; 2b, R = Bui) with Et4NOH first produces endo-D2-R8Si8O11(OH)2 (3a, R = c-C6H11; 3b, R = Bui), which reacts further with Et4NOH to produce endo-C2…
We report measurements of the dc magnetization, the low-field ac magnetic susceptibility, and the electrical resistivity of large (up to 0.5 ${\mathrm{cm}}^{3}$) single-grain samples of icosahedral $R\ensuremath{-}\mathrm{M}\mathrm{g}\ensuremath{-}\mathrm{Z}\mathrm{n}$ $(R=\mathrm{Y},$ Tb, Dy, Ho, and Er). The dc magn…
Elastomeric networks of poly(dimethylsiloxane) (PDMS) were reinforced with silica particles introduced in two rather different ways. The first was by the simple blending of separately-prepared particles into hydroxyl-terminated PDMS chains that were subsequently end-linked, and the second was by in-situ precipitation…
The synthesis of three new derivatives of tert-butylcalix[4]arene bearing four carbamoylmethylphosphine oxide (CMPO) groups as ligating functions on the narrow rim is described. These are easily prepared in 65–80% yield via acylation of the corresponding fixed cone aminoalkoxy (C2 to C4) derivatives with p-nitrophenyl…
Magnetic properties of anisotropic M-type Sr-ferrite containing La and Co (Sr1-xLaxCoxFe12-xO19) was investigated in detail. At a composition of x = 0.3, the magnetic properties for permanent magnets were much improved, with the highest values of Br = 4.45 kG, HcJ = 4.82 kOe, and (BH)max = 4.86 MGOe. The temperature d…
The high-temperature reaction of pure metals with silicon diimide Si(NH) 2 in a specially developed radiofrequency furnace has been successfully applied to the synthesis of novel highly condensed nitridosilicates. With SrCO 3 as an additional starting material this procedure has now been extended to the synthesis of o…
The elastic moduli of yttria (Y 2 O 3 ) samples that were made from powders with various particle morphologies were studied by means of ultrasonic measurements. The soundwave velocities in the longitudinal and transverse modes were measured. The elastic moduli were calculated from the sound velocities and density. For…
The electrical and dielectric properties of co-continuous polystyrene (PS)/poly(methylmethacrylate)(PMMA) blends loaded with carbon black (CB) of a special grade (BP 1000) have been studied. They strongly depend on the selective localization of the CB particles at the blend interface quite consistently with the double…
Continuous mammalian cell lines are important hosts for the production of biological pharmaceuticals. However, these cell lines show some severe disorders in primary metabolism, which they have in common with many cancer cells. This leads to a high throughput of substrates giving a low energy yield and ample toxic sid…
Using a model potential function we have performed a molecular dynamics simulation of several static and dynamical properties of glycerol in the crystal, glass and liquid phases. Comparison with available experimental data shows an excellent agreeent and proves the validity of the potential model used. For the calcula…
The behavior of a system of macroscopic particles introduced in a nematic liquid crystal is studied theoretically. The energy of the pair interparticle interaction associated with the director elastic field deformation is found. The interaction intensity and character are studied as functions of the distance, the geom…
The critical exponents of the second-order ferromagnetic-paramagnetic phase transition of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CoO}}_{3}$ $(0.20<~x<~0.30)$ compounds are obtained. The results $0.43<~\ensuremath{\beta}<~0.46,$ $1.39<~\ensuremath{\gamma}<~1.43,$ and $4.02<~\ens…
The effect of hydrogen on stress corrosion cracking (SCC) of pipeline steels in the near-neutral pH solutions that form in coating disbondments was studied using slow strain rate tests (SSRT), polarization techniques, scanning electron microscopy (SEM), and secondary ion mass spectrometry (SIMS). Results showed hydrog…
The mechanics and materials approach to fatigue problems in engineering materials aspects of fatigue threshold stress range for short crack growth fatigue strength assessment of AlSi7Mg castings micromechanical modelling of fatigue in nodular cast iron direct observation of the formation of striations fatigue fracture…
The simple overlap model is used to calculate crystal field parameters from the crystal structure. It is applied to 25 rare earth and some actinide and 3d transition element compounds for which crystal field parameters have been previously determined experimentally. The model is based on effective charges, located aro…
Quantum-confined CdS nanowires with diameters around 4 nm and lengths ranging from 150 to 250 nm were grown for the first time from cadmium bis(diethyldithiocarbamate) [Cd(DDTC)2]2 by removal of the four thione groups with ethylenediamine (en) at 117 °C for 2 min.
We investigated changes in structures and properties of the endomysium and perimysium during development of semitendinosus muscle in relation to the increase in toughness of pork using samples from neonates to 55-mo-old pigs. The shear force value of pork increased linearly until 6 mo of age, and the rate of increase…
A simple tight-binding plus dispersion model is developed to describe the stacking of graphite planes, and then applied to the study of multi-walled carbon nanotubes. According to this model, the variations in the interlayer interaction energy as two nested nanotubes are rotated and translated relative to one another…