Materials Literature
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The effect of Eu 3+ ion doping in the La sites of single-crystal La 4/3 Sr 5/3 Mn 2 O 7 was investigated. Electron spin resonance (ESR) was applied to La 4/3 Sr 5/3 Mn 2 O 7 and (La 0.8 Eu 0.2 ) 4/3 Sr 5/3 Mn 2 O 7 single crystals. A phase separation and phase transitions were observed from the ESR spectra data. Betwe…
An S-band left-handed tunable phase shifter based on Barium-Strontium-Titanate (BST) thin film is developed. The application of left-handed transmission line considerably reduces the size of the phase shifter. The phase shift reaches about 124 degree while the permittivity of the BST film ranges from 225 to 450. The F…
Carbon nanotubes (CNTs) are the ultimate reinforcing materials for the development of an entirely new class of composites. However, they have the complicated shapes and do not usually appear as straight reinforcements when introduced in polymer matrices. This decreases nanotube’s effectiveness in enhancing the matrix…
In this paper, a novel metamaterial absorber is proposed. The absorber is based on metamaterial which is a kind of artificial periodic structures. The top layer of the absorber is composed of split ring resonators (SRRs) with a square metal patches (SMPs) in each SRR and its bottom layer is covered with whole metal. T…
Polyimide-based (PI) nanocomposites possess excellent electrical and thermal performance, widely used in inverter motor. In the paper using different particle sizes made polyimide/titania (PI/TiO2) nanocomposite films in situ polymerization, including 20nm A series and 50nm B series. The results shows that A series ha…
With device dimensions reaching their physical limits, there has been a tremendous focus on development of post CMOS technologies. Carbon based transistors, including graphene and carbon nanotubes, are seen as potential candidates to replace traditional CMOS devices. In that, floating gate graphene field effect transi…
This paper mainly investigates the optimum parameters for the fabrication of uniform diamond-like carbon (DLC) films on the electron cyclotron resonance plasma enhanced chemical vapor deposition (ECR-PECVD) reaction chamber by analyzing the effect of the reacting gas velocity on the film properties. This work makes us…
A new closed-form solution of the axisymmetric nonstationary problem of elasticity is constructed for a circular thick piezoceramic plate whose outer cylindrical surface is rigidly fixed. The use of mixed boundary conditions for a curvilinear plane allows one to obtain sufficiently simple computational relations. The…
Dielectric characteristics of polytetrafluoroethylene (PTFE) films modified by direct current discharge at the anode and cathode have been studied as a function of frequency and temperature. It has been found that the dielectric constant increases slightly as a result of plasma treatment and weakly depends on temperat…
In the framework of density functional theory (DFT), we have studied the electronic properties of alkene/alkyne-hydrosilylated silicon nanocrystals (Si NCs) in the size range from 0.8 nm to 1.6 nm. Among the alkenes with all kinds of functional groups considered in this work, only those containing —NH 2 and —C 4 H 3 S…
This study sought to investigate photoluminescence (PL) emission spectra of poly allyl diglycol carbonate (PADC) irradiated with short wavelength ultraviolet radiation of 254 nm. PADC samples were irradiated with UVC of 254 nm from UVC Corsslinker (Hoefer) with different doses ranging from 900 J/cm2 to 180000 J/cm2. T…
Diamond films and structures were grown by MWCVD. We show that increasing of CH4 concentration in the gas mixture up to 8% results almost in a linear increasing of growth rate (up to 900 nm/h). Unfortunately, diamond film quality decreases due to the dominance of sp2 carbon phases, as confirmed by Raman measurements.…
A blue emitting phosphor Sr 3 Bi(PO 4 ) 3 :Eu 2+ is synthesized by a high-temperature solid state method, and its luminescent property is investigated. Sr 3 Bi(PO 4 ) 3 :Eu 2+ can create blue emission under the 332 radiation excitation, and the prominent luminescence in blue (423 nm) due to the 4f 5d 1 →4 f 7 transiti…
Multiferroic semiconductors of the CuCrO2 type are considered. These materials, in the presence of free charge carriers, allow for the existence of opposite domains (in the ferroelectric FE d phase), along with ordinary 180° domains (in the FE phase). The magnetization phase transition in a chiral multiferroic, allowi…
The paper deals with a comparison of results of measuring residual stresses and with the study of their effect on the fatigue strength of parts of gas-turbine engines after finish treatments by grinding, polishing, and surface plastic deformation.
There are three key electronic parameters in elucidating the physics behind the Hume–Rothery electron concentration rule: the square of the Fermi diameter (2kF)2, the square of the critical reciprocal lattice vector and the electron concentration parameter or the number of itinerant electrons per atom e/a. We have rel…
The characteristics of gallium selenide with a ferroelectric liquid crystal in between its layers are studied. The liquid crystal consists of an achiral smectic (a derivative of phenyl benzoate) and a chiral component. The frequency behavior of the specific impedance, permittivity, and loss tangent at different temper…
A series of poly(A-block-B-block-A) copolymers based on biodegradable poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and amorphous polystyrene (PS) were synthesised by atom transfer radical polymerisation (ATRP). The chemical structure, molecular weight and distribution were systematically characterised by Fourie…
The structural, electronic, and optical properties of rutile—, CaCl 2− , and PdF 2 —ZnF 2 are calculated by the plane-wave pseudopotential method within the density functional theory. The calculated equilibrium lattice constants are in reasonable agreement with the available experimental and other calculated results.…
The species composition of centric diatoms from Lake Frolikha (Transbaikal area) has been studied. The lake is located on the eastern shore of Lake Baikal and connected with it by a river. Twenty-three species of Centrophyceae from 7 genera ( Aulacoseira, Cyclostephanos, Cyclotella, Discostella, Handmania, Pliocaenicu…