Materials Literature
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The degradation and/or apatite layer precipitation ability of porous β-tricalcium phosphate(β-TCP) samples treated and untreated with microwave radiation during synthesis is investigated. Microwave heating was used to accelerate the formation of CDHA with the Ca/P ratio 1.5 in a shorter processing time which later for…
Sorption of Pu from weakly acidic and weakly alkaline solutions on Taunit carbon nanomaterial was studied. Under these conditions, both polymeric Pu(IV) and ionic Pu(V, VI) species are recovered from freshly prepared solutions. Also, Pu is efficiently sorbed from simulated groundwater after more than 10 months of stor…
The kinetics of growth of a new nanosized phase in a binary diffusion couple during isothermal annealing has been investigated with allowance made for the size dependence of kinetic coefficients. It has been demonstrated using this approach that the exponent of the growth rate of the new phase can be non-monotonic in…
Results from a study of the structure and properties of the metal of drums made of Grade 16GNM steel that have been in operation for a long period of time are presented. A change in the strength characteristics and fracture ductility of metal with respect to its initial properties indicated in its certification data i…
A new asymmetric backward coupler is obtained by edge-coupling two types of composite right/left handed (CRLH) lines. This novel coupler is analyzed in a microwave range (1-10 GHz) and the magnitude of the scattering parameters reveals tight coupling effects (even 0 dB) in a dual frequency band and also very good dire…
We present a theoretical study of amorphous and crystalline thin-film solar cells with a periodic pattern on a sub-micron scale realized in the silicon layer and filled with silicon dioxide right below a properly designed antireflection coating. The study and optimization of the PV structure as a function of all the p…
This paper addresses the influence of the viscoelastic material properties of adhesives on the functionality of SHM (Structural Health Monitoring) sensor applications. Epoxy adhesives behave viscoelastically and show a strong temperature and time dependency of their mechanical properties. Creep processes increase the…
Defects of carbon and low-carbon steel reinforcement of periodic profile are investigated. Optimal heat-treatment conditions for reinforcement used in Kazakhstan are investigated in laboratory tests.
This paper is a review of the thermal stability of nanostructured nitride coatings synthesised by reactive magnetron sputtering technique. In the last three decade, nitride based coatings have been widely applied as hard wear-protective coatings in mechanical components. More recently, a larger interest has been addre…
We report research on the characterization of stresses in relation to defects in multicrystalline silicon (mc-Si) solar cell material. Photoelasticity and micro-Raman spectroscopy (μRS) techniques are combined to understand this correlation at different length scales. While photoelasticity can probe small residual the…
Upon variation in the duration of mechanical activation, characteristic temperatures of thermal explosion (TE) in Ti-Ni powder mixtures and phase composition of products were explored by electron microscopy, optical metallography, and XRD. The results shed new light on the mechanism of structure formation during TE an…
This paper reports characteristic of iron loss in two Induction Motors made with Soft Magnetic Composite core based on Finite Element Analysis. Two Induction Motors made with Soft Magnetic Composite are All SMC Induction Motor and Stator SMC Induction Motor. Iron loss at no-load running in the All SMC Induction Motor…
A description of a microthruster operating on the single-component propellant-hydrazine with the Shell-405 catalyst is presented. The hydrazine decomposition reaction at the specified parameters occurs on the surface. The gas temperature entering the nozzle actually depends on the catalyst temperature. It is establish…
Effects of time-varying sheared E×B flow on turbulence driven by slab ion temperature gradient instabilities are investigated by means of Landau fluid simulation. Here, the E×B flow, which consists of stationary and time-periodic oscillatory parts, is externally imposed to the turbulence. The dependence on the amplitu…
This paper describes the functioning of a hardening installation with electromagnetic induction from the point of view of generating harmonics in the power distribution. The authors modeled a simplified active filter in parallel configuration in scope of reducing the effects of the generated non-sinusoidal regime. Mod…
Monodisperse gold nanoparticles made in our lab can be used for high magnification calibration of transmission electron microscope (TEM), providing the clear lattice image, good stability and image contrast. TEM was adjusted to focus on gold nanoparticle lattice structures, and the lattice spacings were determined by…
Abstract Single‐crystal X‐ray diffraction studies of two terminally protected tetrapeptides Boc‐Ile‐Aib‐Val‐m‐ABA‐OMe (I) and Boc‐Ile‐Aib‐Phe‐m‐ABA‐OMe (II) (Aib=α‐aminoisobutyric acid; m‐ABA=meta‐aminobenzoic acid) reveal that they form continuous H‐bonded helices through the association of double‐bend (type III and…
The hybrid Kevlar/PTFE (polytetrafluroethylene) fabric composite was prepared by impregnating of Kevlar/PTFE fabric in phenolic resin containing nano-alumina and the successive curing. To investigate the effects of nano-alumina on the tribological properties of the fabric composite, wear tests were performed on block-…
Homogeneous MnIn 2 S 4 single crystals ∼14 mm in diameter and ∼40 mm long were grown by directional solidification of melt. For these MnIn 2 S 4 single crystals, the composition was determined by electron probe microanalysis, structure by X-ray diffraction, and melting temperature by differential thermal analysis. Tra…
In this paper, an empirical model was developed for high stress abrasive wear behaviour of unidirectional sisal fibre reinforced epoxy composites under varying operating parameters, for which a number of experiments were carried out to determine the abrasive wear behaviour of the composites. Polysulphide modified epox…