Materials Literature
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In the work we develop programs for computation of the system of atoms at every step and visualization of that data, also we research of thermodynamic properties and conditions of formation of different carbon nanostructures, try to predict existence of new materials. Nowadays we have two separate programs: one for co…
We present the design and fabrication of metamaterials, and investigated the power transmission properties of the metamaterials in the frequency ranging from 1.04THz to 4.25THz. The measured results reveal a global maximum transmission peak at 2.52THz. We compared measured power transmission performances of four types…
Neutron diffraction studies on technical ferroelectric ceramics under the influence of high electric fields were performed to establish correlations between the macroscopic poling behaviour and corresponding structural changes. The investigations were carried out on bulk samples of lanthanum doped lead zirconate titan…
A magnetic state of real system of biocompatible particles Ca0.5Ba0.5Fe12O19with a quite wide size distribution within the single domain limit was studied in this paper.
We have investigated the molecular alignment structure of ferroelectric liquid crystals (FLCs) in a wide-gap cell for application to optical devices, such as an electrically controlled lens. The transformation of the smectic layer structure has been observed under an electric field, particularly under a low electric f…
KMg0.09Fe1.91(PO4)2is isotypic with KMIIFe(PO4)2(MII- Fe, Cu) (monoclinic system, space group P 21/n). The framework is built up from [FeO5] and [Fe(Mg)O6] polyhedra sharing vertices, edges and connected by two types of bridging PO4tetrahedra. The K atoms are nine-coordinated and are located in hexagonal channels runn…
Bismuth/barium-containing crystals have attracted much attention in application of material engineering because of their importance for the development of nonlinear optical (NLO) information processing technology. Compared to crystals, glasses have shown many advantages in the material engineering, such as easier shap…
For a better force computation of a three phase permanent magnet linear synchronous actuator, the self inductances of this actuator are modeled. A two dimensional axi-symmetric finite element model is built for the actuator taking into account saturation effects. The inductance values are computed for different curren…
The comparative analysis of computer modeling and experimental investigations results for temperature distribution in dielectric materials using different types of radiators are presented.
The brittle to ductile transition (BDT) in nickel free high nitrogen austenitic stainless steel was investigated. Falling weight impact tests at 176, 273 and 336 K revealed that Fe–25Cr–1·1N (wt-%) austenitic steel exhibits a sharp BDT in spite of being a face centred cubic alloy. The plastic deformation observed foll…
Electronic and ionic defects are unavoidable elements of structural disorder in oxide materials resulting from nonstoichiometry or impurity/doping ions. Many point defects involving electrons or transition metal ions give rise to optical absorption, providing a probe to study defect chemistry and transport properties…
We present various classes of monolithically-integrated nanoplasmonic devices and circuits on a complementary metal-oxide-semiconductor (CMOS) platform for electronic-plasmonic hybrid integration. Through this investigation, we demonstrate ultrafast switching, modulation and routing of such devices.
Using a cavity based on a periodic-surface-lattice (PSL) the concept of a high-power, 200GHz Cherenkov source is developed. If the PSL satisfies certain defined conditions single mode operation is observed.
A new strategy for preparation of nano-sized barium titanate (BaTiO3) particles was applied by using: layered (tetramethyl)ammonium titanate, barium acetate and tetramethylammonium hydroxide. An addition of barium salt to aqueous layered titanate colloids leads to a precipitation phenomenon by which barium titanate pr…
We demonstrate the concept of an anti-rod dimer planar metamaterial with strong birefringence and optical activity in the THz range. The retrieval of circular transmission components shows an asymmetric transmission effect for right-to-left and left-to-right polarization conversion.
We theoretically investigate the nonlinear terahertz photon-mixing effect in graphene and topological insulator. We show that the nonlinear intraband optical absorption in both materials dominate over the linear response under a very moderate external electric field strength. The nonlinear response is thermally enhanc…
We present the fabrication, structural, and transport properties of MgB2-based ceramic composites with magnetic nanospheres fabricated by spark plasma sintering. The nanospheres are either carbon–encapsulated iron or iron oxide. The former nanospheres have been prepared by laser pyrolysis whereas the iron oxide was ob…
Through first-principles electronic-structure calculations, we suggest that because the transitionmetal (TM)-d levels are located deep within the conduction band, TM (M = Hf, Zr, or Ti)-doped amorphous In 2 O 3 (a-In 2 O 3 ) can provide shallow donors, even though the effective mass of the a-In 2 O 3 is slightly incre…
AVANT PROPOSCe rapport contient les résultats de relevés de traces d'érosion faits pendant les mois d'avril et de mai 2012 dans le bassin versant La Chevrotière dans le cadre du projet « Cartographie d'érosion hydrique du sol par télédétection satellitaire à très haute résolution spatiale -application aux terres agric…
Interaction of a single chemically active bubble in water with acoustic waves is numerically studied within the framework of the model of a two-dimensional unsteady flow of an ideal compressible medium. The boundaries between the phases are explicitly identified. It is demonstrated that bubble explosion initiation can…