Materials Literature
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We have fabricated and tested Schottky-type photovoltaic cells based on chloro(sub-phthalocyaninato)boron(III) complex, SubPcBCl. The vacuum-deposited SubPcBCl layer was sandwiched between standard glass/ITO substrate and evaporated Au , Ag or Al top metallic electrode. Performance of such cells depends on the work fu…
Previous pollution and non-uniform wetting tests for 550 kVac applications have established the improvement in withstand under 60 Hz voltage that can be obtained in the performance of 3.0 m long 32 mm diameter FRP hot sticks when 15 heat-shrunk polymeric sheds are installed. Each shed has an overhang of 30 mm and they…
The numerical model following the equivalent magnetic domain method is proposed to calculate the anisotropy of the magnetic properties of electrical steel. The angle difference between magnetic flux density vector and magnetic field vector, which is observed in the measurement data, is clearly expressed by the propose…
Metamaterials are artificial media with novel electromagnetic properties. We study the metamaterial unit cells at terahertz frequencies, investigate their electric and magnetic responses to the incident wave, and retrieve their effective material parameters. Simulation results reveal the origins of the effective permi…
Thin layers of GaMnAs ferromagnetic semiconductor grown by molecular beam epitaxy on GaAs(001) substrates were studied. To improve their magnetic properties the post-growth annealing procedures were applied, using the surface passivation layers of amorphous arsenic. This post--growth treatment effectively increases th…
Changes in the functional composition of chitosan films in the course of storage under ambient conditions were examined by conductometric titration and IR spectroscopy. The deformation-strength and thermal properties of the films were studied, and their supramolecular structure was analyzed by X-ray diffraction.
Nano-crystalline particles of barium hexaferrite have been prepared by co-precipitation route using solution of iron and barium chlorides with a Fe/Ba molar ratio of 12 by addition of NaOH with OH-/Cl-molar ratio of 2. A mixture of water and diethylene glycol with volume ratio of 1:3 was used as a solvent in the proce…
Abstract Summary: Self‐assembly of a few OPV derivatives having different end functional groups to aggregates, fibrous networks and organogels are discussed. OPV1 and OPV2 functionalized with ester moieties form gels in nonpolar hydrocarbon solvents whereas OPV3 with carboxylic acid groups form gel from THF and dichlo…
CsSmP4O12 crystals have been prepared at 300°C in molten polyphosphoric acids containing Cs, Mg, and Sm cations, and their crystal structure has been determined: sp. gr. I $$ \bar 4 $$ 3d, a = 15.1225(8) Å, Z = 12, CsNdP4O12 structure.
Gold nanoparticles with an average particle size below 3 nm have been synthesized and stabilized with different thiol-derivatized molecules for studying the influence of the capping molecule on the magnetic behavior. Thiolated-alkane chains with different lengths as well as a thiol-containing biomolecule (tiopronin) h…
Solid solutions of the composition LaGa1 − x Ni x O3 (0.01 ≤ x ≤ 0.10) are synthesized, and their magnetic and electrical properties are investigated. It is established that the ground state of the Ni(III) atoms is the low-spin state 2 E g ; however, in the temperature range under investigation, there occurs the 2 E g…
A new Rhoicosphenia species, R. tenuis Levkov & Nakov is described from Lake Ohrid. It is characterized by its narrow linear valves (valve width up to 4.5 μm), which differentiate it from the otherwise similar R. curvata. This species has an ultrastructure typical of the rest of the freshwater representatives of the g…
A newly developed passivation/acid immersion technique was employed to produce pits free from deformation or residual stress on X-52 pipeline steel samples. Pits have been found to be a common source of crack initiation and the experimental procedure would prove useful in research in crack initiation. Pits generated u…
We report on the theoretical and experimental analysis of Omega-type metamaterials operating in X and Ku-bands. The prototypes are fabricated on the basis of metal waveguide technologies (hollow and TEM parallel plate) loaded with printed boards of interconnected Omega-shaped motifs. This interconnection of particles…
The magnetization of Fe/Si multilayers, grown by thermal evaporation in an ultrahigh vacuum system, was investigated at high temperatures. Magnetization and its temperature dependence up to a high temperature of 800 K depend on individual Fe layer thickness dFe. This dependence is the result of the formation of an Fe–…
The nature of the magnetic phase transition of the itinerant ferromagnet CoS2has been studied. We have measured high-pressure X-ray diffraction and magnetization, at different temperatures and fields. Our results are discussed on the basis of a thermodynamic model applicable to itinerant ferromagnets with strong spin…
Impedance spectra of an iron membrane electrode are recorded in a range of the active metal dissolution potentials in an acidic sulfate solution. The rate constants of the elementary adsorption stages of iron dissolution are found to decrease with an increase in the amount of atomic hydrogen. This results in a decreas…
It is revealed that TlS single crystals exhibit a variable range hopping conduction along a normal to their natural layers at temperatures T ≤ 230 K in a dc electric field and a nonactivated hopping conduction at low temperatures in strong electric fields. Estimates are made for the density of states near the Fermi le…
The “exciton gas-plasma” transition (the Mott transition) in a Si 0.93 Ge 0.07 /Si thin quantum well is investigated using low-temperature photoluminescence. It is demonstrated that this transition is smooth and occurs in the concentration range from approximately 6 × 10 10 to 1.2 × 10 12 cm −2 . At a temperature of 2…
Recent studies have led to a rapid increase in our knowledge of auxospore structure in diatoms. However, these studies have been limited to centric and raphid pennate diatoms, and there is still very little information on the sexual reproduction in araphid pennate diatoms. Using LM and SEM, the fine structure of the a…