Materials Literature
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Metal oxide nanoparticles have been shown to improve the dielectric breakdown strength of insulating polymers. Polyamideimide is a material of practical use for high temperature insulation, and nanoparticle fillers show promise in improving the high temperature stability and dielectric breakdown strength. This work de…
The mechanical properties of E-glass/epoxy composite at high strain rates are important in evaluating this kind of composite under dynamic and impulsive loading. The in-plane and out-of-plane compressive properties at strain rates from 300 to 2500 s-1 were tested with split Hopkinson pressure bar. Samples were tested…
Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.
Wear resistance and structural transformations upon abrasive and adhesive wear of titanium nickelide Ti49.4Ni50.6 in microcrystalline (MC) and submicrocrystalline (SMC) states have been investigated. It has been shown that the abrasive wear resistance of this alloy exceeds that of the steel 12Kh18N9 by a factor of abo…
High-quality Zn1−xCoxO layers were obtained with isolated Co ions in the host (x no more than 0.008). The photoluminescence properties of excitonic and Co-related emissions in the Zn1−xCoxO (x=0.0015) layer were mainly investigated in both zero and up to 7 T magnetic fields in order to clear the energy transfer proces…
GoldMag (Fe3O4/Au) nanoparticles have the advantages of both magnetic response in an external magnetic field and the immobilization of molecules on their surface in a single step. The cytotoxicities of GoldMag nanoparticles and GoldMag nanoparticles loaded with doxorubicin (Dox-GoldMag) combined with an external magne…
Cs1 − x Rb x H2PO4 solid solutions have been synthesized for the first time in a broad composition range, x = 0.03–0.9. At room temperature, the Cs1 − x Rb x H2PO4 solid solutions are isostructural with the low-temperature phase of CsH2PO4 over the entire composition range studied. In the CsH2PO4-based solid-solution…
Adornment (Toison d'Or de la Parure de Couleur) in 1749, but was stolen in 1792 during the French Revolution. Twenty years later, a 45.52 ct blue diamond appeared for sale in London and eventually became part of the collection of Henry Philip Hope. Recent computer modeling studies have established that the Hope diamon…
A multi-component blend of inhibitors containing sodium salt of diethyldithiocarbamate (DEDTC) (50 to 100 ppm), Zn 2+ as ZnS0 4 .7H 2 0 (50 to 70 ppm) and 1-hydroxy ethyledene-1,1-diphosphonic acid (HEDP) (50 to 150 ppm) was formulated as corrosion and fouling inhibitor for carbon steel in open recirculating cooling w…
We present the dispersion relation of guided-mode resonances in planar periodic waveguides, both for s-polarized (TE mode) and p-polarized (TM mode) incident waves. For a fixed homogeneous planar waveguide, dispersion curves of the TE eigenmode cannot cross that of the TM eigenmode at all. That is to say, at a certain…
Aluminium nitrite (AlN) or alumina (Al2O3) substrates are widely used in power electronics modules, due to their ability to provide both electrical insulation, and heat conduction properties. A gel layer usually covers the substrate, semiconductor chips, and bondings to prevent partial discharges (PD) from occurring w…
Vibrations and longitudinal waves in a composite formed by a viscoelastic matrix and solid-state inclusions are considered. Vibration-wave processes in the long-wave approximation are described on the basis of the complex dynamic density taking into account inertial-elastic-viscous interaction of the matrix and inclus…
The different parts of Calotropis gigantea and Vinca rosea belonging to the families of Asclepiadaceae and Apocynaceae were studied for their antioxidant and antimicrobial activities against selected bacterial strains. From the results it was evident that the flower of Vinca rosea showed the highest antioxidant activi…
In this study effects of small amount of yttrium addition on grain growth of C.P titanium (single α), Ti-14Mo-3Nb-1.5Zr (single β) and a newly developed Ti-4.5Al-6Nb-2Mo-2Fe (α+β) titanium alloy are investigated. By adding yttrium nano-sized Y 2 O 3 particles are formed in 'in-situ' mode. These particles lead to signi…
The authors have studied the field emission (FE) behavior of multiwalled carbon nanotube (MWCNT) yarn at different temperatures. By analyzing how the FE characteristics change with temperature and the residual gas spectra of the vacuum chamber, it was concluded that the intrinsic FE of MWCNTs follows the Fowler–Nordhe…
Results from tests of technology for decontaminating spent radioactive ion-exchange resins at the Balakovo and Kalinin nuclear power stations are presented. Versions of technological schemes with cleaning and repeated use of decontaminating solution are considered. The possibility of considerably reducing the volume o…
Core-shell structured heterogeneous catalyst nano-particles offer the promise of more efficient precious metal usage and also novel functionalities but are as yet poorly characterised due to large compositional variations over short ranges. High angle annular dark field detector in a scanning transmission electron mic…
The particulars of the EPR spectrum of magnetically concentrated crystals of double molybdates and tungstenates with a crystal structure of low symmetry were studied at liquid-helium temperatures in the frequency range 15–120GHz. The directions of the principal magnetic axes were determined and the principal values of…
Abstract A synthetic strontium isomorph (Sr 2 ZnSi 2 O 7 ) of the hardystonite structure (Ca 2 ZnSi 2 O 7 ) was investigated with X-ray powder diffraction. The average structure (S.G. P -42 1 m ), a = 8.0007(1) Å, c = 5.1722(1) Å, was refined by Rietveld method and a R F 2 = 0.0216 was achieved using 394 independent r…
Ca 0.9 Yb 0.1 MnO 3 nanopowder prepared by a gas-phase reaction (GPR) consisted of well-dispersed particles with an average diameter of 47 nm. Sintering of this GPR powder proceeded rapidly and at a lower temperature than that required for a comparable powder prepared by conventional solid-state reaction (SSR). The si…