Materials Literature
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The study presents synthesis of vinyl alcohol and L-aspartic acid copolymers (PVA-co-Asp), by solution polycondensation procedure using manganese acetate as a catalyst. Two copolymers were obtained with molar ratio of poly(vinyl alcohol) (PVA) structural unit to aspartic acid equal to 10/0.5 and 10/1, respectively. PV…
The influence of oxygen content on the dielectric property of BiFeO 3 ceramics is studied by experiment and first-principles calculation. The experimental result demonstrates that the dielectric constant of BiFeO 3 is strongly dependent on introduced oxygen and oxygen vacancies. By comparison with BiFeO 3 , the introd…
It is known that hydrogen embrittlement occurs in austenitic stainless steels like type 304 because of the strain induced martensitic transformation. Rotary bending fatigue tests of type 310S stainless steel with hydrogen cathodic charging were carried out to investigate the effect of hydrogen charging on the austenit…
The aging of the epoxy-paper insulation of an oil-impregnated transformer was studied through partial discharge analysis. Accelerated electrical aging tests were carried out on samples of transformers windings, with and without paper insulation. Partial discharge (PD) measurements according to standard IEC 60270 were…
Means of improving and stabilizing the mechanical properties of titanium alloys are proposed: alloying with fewer alloying elements; thermal and thermomechanical treatment.
Samples of ultradispersed polytetrafluoroethylene, which were prepared with the use of different technological approaches, were studied by X-ray diffraction. The samples were found to belong to the monoclinic system. For some samples, basal reflections, which can be related to paraffins, were found for the first time.…
An extensive study of the intercalation of a number of commercially important anions into a range of layered double hydroxides (LDHs) has been presented. Intercalating anions include key drugs, vitamins, fragrances, dye, etc. The immense potential of LDH systems as reservoirs and carrier of different functional anions…
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…