Materials Literature
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Graded index -near-zero (GRIN-ENZ) quasi-optical components such as beam steerers and power splitters are designed, simulated and analyzed. The GRIN-ENZ medium is realized using stacked narrow hollow waveguides whose infinite array shows the first transmission peak at 1.0002 THz. Several GRIN-ENZ beam steerers to chan…
Abstract Colloidal silver nanoparticles were prepared by rapid green synthesis using different tannin sources as reducing agent viz. chestnut (CN), mangrove (MG) and quebracho (QB). The aqueous silver ions when exposed to CN, MG and QB tannins were reduced which resulted in formation of silver nanoparticles. The resul…
Abstract The chemical and sorption properties of clay minerals from the Mako area, Senegal, were investigated using FTIR spectroscopy, X-ray diffraction, scanning electron microscopy equipped with an X-ray energy dispersion spectrometer, thermal analysis and chemical analysis. The clay sample is essentially dominated…
Sericin is a globular water-soluble protein that constitutes 25 to 30 % of silk proteins weight in silkworm`s cocoons. This protein envelopes silk fibers gluing them and ensuring the cohesion of the cocoon. During raw silk production, sericin is separated from silk fibers and it is discarded in wastewater, leading to…
Composite materials (also called composition materials or shortened to composites) are materials made from two or more constituent materials with significantly different physical or chemical properties, that when combined, produce a material with characteristics different from the individual components. The individual…
Moisture transportation through fabrics is one of the important parameters which affect clothing comfort. The combination of different factors which include fiber, yarn and fabric structure will yield varying degrees of clothing comfort. This research work concentrated on the use of viscose fibers spun on the vortex s…
A total of 236 species and intraspecific taxa of Bacillariophyta diatoms from 55 genera, including 15 new ones for Russian flora, were found in an SEM study of phytoplankton in Lake Glubokoe and large tributaries (Nizhnyaya Messoyakha, Purparod, Erparod, Paravanga, and Nyakhataparod) in the basin of the lower reaches…
The frequency, field, temperature, and amplitude characteristics of the direct magnetoelectric effect are studied in a planar monolithic structure consisting of a piezoelectric langatate crystal and a layer of electrolytic nickel. A relation between the magnetic and magnetoelectric properties of the structure is demon…
The stability of reactor operation for catalytic oxidation of lean CH 4 has been investigated through modeling and simulation, particularly the influence of switching time and heat extraction on reverse flow reactor (RFR) performance. A mathematical model of the RFR was developed, based on onedimensional pseudo-homoge…
Nowadays, the existence of small gas-filled cavities in solid dielectric such as HV cables and transformers is difficult to avoid during manufacturing process, so detecting their effects on the equipments are very critical for the life of high voltage equipments. It is obvious that the simplest and most famous equival…
A new Schiff base, 4-((6-ethoxybenzothiazole-2-ylimino)methyl)benzene-1,2-diol (3,4-HBAEBT) was synthesized by the condensation reaction of 3,4-dihydroxybenzaldehyde (3,4-HBA) and 2-amino-6-ethoxybenzothiazole. The Schiff base, then, was converted to its polymer derivatives by oxidative polycondensation reaction in bo…
The process of Cu-film compaction on graphene under the action of Ar 13 clusters hitting the surface with an energy of 5 eV is studied using the molecular-dynamics method. The horizontal and vertical components of the self-diffusion coefficient of a Cu film and graphene, the stresses on the horizontal Cu area, the Cu-…
This work proposes a new shape memory actuator based on a slider and slot mechanism. The particular layout can be associated to a simplified air cooling with a single fan and results in a solid and reliable structure. Dimensioning of parts is described and preliminary experimental results are presented.
Among the various Severe Plastic Deformation (SPD) processes, Equal Channel Angular Pressing (ECAP) is one of the most applicable one which improves strength and ductility due to grain refinement and suitable texture development. In this study, cold rolling were carried out on the 4 pass ECAPed (in route A and C) stri…
Graphene on gallium nitride (GaN) will be quite useful when the graphene is used as transparent electrodes to improve the performance of gallium nitride devices. In this work, we report the direct synthesis of graphene on GaN without an extra catalyst by chemical vapor deposition. Raman spectra indicate that the graph…
Patterns of plastic deformation of nanocrystalline (NC) technical grade VT1-0 titanium, are studied in quasi-static tensile experiments, with the average size of the grain d, ranging from 35 nm to 2 μm, at the temperature interval 4.2 K < T < 395 K. The wide range of grain size, and grain size distribution, was made p…
The piezoelectric properties of (100)-orientated BiFeO 3 thin films grown on (100)LaNiO 3 /SiO 2 /(100)Si were investigated. 200-nm-thick LaNiO 3 and 250-nm-thick BiFeO 3 was deposited by the rf magnetron sputtering method and sol–gel method, respectively. The (100)-oriented BiFeO 3 films were distorted to the in-plan…
Effect of a glow discharge on the ferritization process in the Fe2+-Ni2+-SO4 2−-OH− system was studied. The phase and granulometric composition of the samples synthesized was determined. The crystal lattice constants and the crystallite size were found to depend on the synthesis conditions. The main magnetic character…
The spectral-luminescent properties of the synthesized bismuth-containing quartz-like glass exposed to heat treatment have been studied. The appearance of the thermoinduced bismuth centers of luminescence, which are the result of the reduction of Bi3+ ions, has been observed. It has been shown that the reduction of Bi…
The effect of electrolytes with single-, double- and triple-charged counterions, as well as cationic (cetyltrimethylammonium bromide) and anionic (sodium dodecyl sulfate) surfactants, on the electrokinetic potential of multiwall carbon nanotubes prepared via catalytic pyrolysis of propylene in a gas phase according to…