Materials Literature
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A model is presented for $pn$ junction formation near metal-semiconductor contacts in two-dimensional semiconducting systems such as graphene. Carrier type switching occurs in a region near the metal-semiconductor junction when energy band bending leads to a crossing between the junction Fermi level and the Dirac ener…
In this work the influence of the thermal treatment on the local mechanical properties of model diluted Cu-Co alloys with Co content of 4 at.% is investigated. The samples underwent annealing at 1273 K followed by water quenching. The further thermal treatment at 1073 K of the oversaturated solid solution generated a…
The mechanism of underground steel pipelines destruction by induced alternate currents in defects of waterproofing coat is considered in the article. Experimental assemblies have been developed to define the limit of qualitative change of character of degradation processes in steel under the action of alternate curren…
It was demonstrated that the application of self-propagating high-temperature synthesis as a low energy expenditure method to produce alloys of the Al-TiC system is of high priority. The process for the preparation of the charge and obtaining a composite alloywere described. The results of studies of electrical conduc…
A new approach to obtaining bulk AlN single crystals by vapor-phase epitaxy has been tested. NH 3 and Al vapor were used as growth reagents. The following ranges of growth parameters were admissible for the laboratory equipment (experimental growth installation): temperatures of 1050–1500°C at ammonia flow rates of up…
In contrast to imaging in visible spectrum temporally-varying distortion (drift distortion) caused by positional errors of electron beam during the scanning process occurs in SEM devices. This effect is always present in the data from SEM and its magnitude depends on acquisition time, magnification and conductivity of…
The aim of the paper is to present developed methodology for evaluation of mechanical properties using nondestructive (NDT) methods. The final methodology will focus on evaluating the mechanical properties of the heterogeneous weld structure. The mechanical properties are determined by conducting NDT instrumented Vick…
The physic and dielectric properties of the polyetherimide/bamboo charcoal (PEI/BC) composites were studied by using bamboo charcoal as the conductive filler. The PEI/BC composites are fabricated using PEI, dispersant, solvents, and BC powder (BCP). The effects of the content of BCP on the physical and dielectric prop…
Transmittivity of one-dimensional defected photonic crystal is analytically computed for normal and oblique incidences of electromagnetic wave. Presence of defect is considered in both the layers of unit cell (GaN/AlxGa1-xN), and result is compared with that obtained for ideal structure. Transfer matrix technique is u…
NiTi shape memory alloy thin film sputter-deposited on a large scale silicon wafer was characterized by means of instrumented (depth-sensing) indentation technique. Thickness of deposited thin film was measured by calotest device. Microstructure of thin film was observed using differential interference (Nomarski) cont…
Due to deregulation of electric market providing quality power has become an important concern of both power suppliers and customers. Lots of efforts have been made to improve the power quality using passive filters, active power filters, hybrid filters and the new concept of custom power. The custom power devices are…
An analytical thin film thickness model based on the geometry of a commercial vacuum coating system is proposed. This model can calculate the profiles of linear variable filters (LVFs), which are used to eliminate overlapping orders of spectra due to the use of a diffraction grating and which are fabricated using a lo…
De acordo com a classificação API, os óleos básicos estão divididos em cinco grupos. Desses, três grupos são relacionados às bases minerais parafínicas (grupo I, II e III) tendo como parâmetro de diferenciação o teor de saturados, enxofre e índice de viscosidade. Além das diferenças de propriedades encontradas entre o…
This paper examines the mechanical properties of the composite of thermoplastic polymer matrix with carbon nanotubes. As the basic polymer matrix polyamide (PA) was used to which the nanoparticles in a given percentage by weight in the form of nanotubes were added. Composite was injected into the Arburg injection mold…
The Random Phase Approximation (RPA) is a widely employed post Hartree-Fock or DFT method, capable of capturing van der Waal interactions and other dynamic correlation effects at relatively low costs of $\mathcal O(N^3)$ in time and $\mathcal O(N^2)$ in memory, if calculated from imaginary time propagators. However, s…
Abstract C24H20MnN6O5, triclinic, P1̅ (no. 2), a = 10.442(4) Å, b = 11.450(4) Å, c = 11.487(4) Å, α = 75.534(7)°, β = 64.803(7)°, γ = 82.086(7)°, V = 1202.5 Å3, Z = 2, Rgt(F) = 0.0598, wRref(F2) = 0.1756, T = 296 K.
Austempered Ductile Iron (ADI) is a nodular cast iron, thermally treated by the austempering process, which results in superior mechanical properties such as tenacity, ductility, wear and fatigue resistance, broadening the application field of cast irons and becoming a high competitive engineering material. In this pa…
Plastic zone around a fatigue crack in AISI 304 stainless steel was studied experimentally using nanoindentation and numerically by the finite element analysis. Results obtained from one experimental observation of crack propagating under constant amplitude loading showed that nanohardness can be correlated to strain…
Power Quality is defined as “any occurrence manifested in current, voltage, or frequency deviations that results in damage, upset or failure of end-use equipment’s. It is common experience that electric power of poor quality has detrimental effects on health of different equipment and systems. The voltage at the equip…
La conservacion de microorganismos viables tiene interes en diversos sectores industriales. Asi, por ejemplo en la industria alimentaria, la panificacion, vinicultura y cerveceria entre otros requieren procesos de fermentacion que son iniciados con starters o microorganismos colonizadores requeridos para la generacion…