Materials Literature
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We show experimentally and numerically that cholesteric-type metal-dielectric structures, made of twisted sub-wavelength hole elliptical–shaped arrays, exhibit strong optical activity and circular dichroism. The experimental demonstration is carried out with terahertz time-domain spectroscopy measurements on a three l…
Magneto-optical spectra of polycrystalline samples of the Fe 48 Mn 24 Ga 28 Heusler alloy undergoing martensitic transformation from the high-temperature paramagnetic austenitic to ferromagnetic martensitic phase have been studied at 50–320 K in the transversal Kerr effect geometry. A comparison of magnetooptical spec…
Inhibition of low carbon steel (LCS) corrosion in 3.5% NaCl of Pluchea indica Less. leaves extract (PILLE) has been studied using various investigation techniques such as weight loss and polarization methods. The percentage of inhibition increased as the concentration of the inhibitor increased. The results of corrosi…
Radio-absorbing properties of polymer composite materials with carbon nanotubes (CNT) are studied in the extremely high frequency (EHF) range. The possibility is shown of producing radio-absorbing materials (RAMs) with CNT efficiently absorbing electromagnetic radiation (EMR) in the range of 52–73 GHz at thicknesses 1…
An examination is made of the main analytical relationships for determining the thermophysical properties of polymer composites, recommended for engineering calculations of equipment for the production and processing of these materials.
Abstract Five green algal taxa rarely occurring in the world were found in subalpine lakes of the High Tatra Mountains in Poland. These are Actinastrum gracillimum G.M. Sm. var. elongatum (G.M. Sm.) Fott, Monoraphidium tatrae (Hindák) Hindák, Pediastrum braunii Wartm. in Wartm. et Schenk, Scotiella tuberculata Bourr.…
The morphotropic phase boundary (MPB) for high-density solid solutions with compositions of xPb(Mn1/3Nb2/3)O3–yPbZrO3–zPbTiO3 (PMnNZT) with x = 0.02–0.16, y = 0.42–0.56, and z = 0.42–0.56 has been refined on the basis of an analysis of the dielectric and piezoelectric properties of the fabricated samples. An X-ray dif…
In this paper, the flame pyrolysis method to synthesize self-oriented carbon nanotubes (CNTs) with Fe/Mo/Al2O3 as catalyst is studied. The outcome arrays are well aligned and relatively good in morphology. Furthermore, after electric field being applied to flame pyrolysis synthesis, the arrays become straighter and lo…
Addition of fine zirconia particles in the alumina matrix in order to produce ZTA composite is a well-known method for improving the mechanical properties of alumina ceramics such as flexural strength and fracture toughness. Increasing homogeneity and reducing alumina grain size are two key factors for achieving prope…
Novel polymer nanocomposites with iron oxide nanoparticles in a poly(1-vinyl-1,2,4-triazole) matrix are promising for the development of new biomedical materials of long-term effect.
This paper presents a new method dedicated to thermal properties (conductivity and diffusivity) measurement of dry bulk materials including powders. The cylindrical three layers experimental device (brass/bulk material/stainless steel) and the principle of the measurement method based on a crenel thermal excitation ar…
Here, we report on the structural and the optical properties of polycrystalline NiO thin films prepared by using the thermal oxidation of metallic Ni. After the deposition of the Ni films, they were placed in a thermal oxidation furnace at different temperatures (400, 500, 600, 700, and 1000 °C), resulting in mean cry…
Magnesium oxide (MgO) nanopowders were synthesised by a sol–gel method with different amounts of ammonium hydroxide (NH 3 ·H 2 O) and characterised by a combination of thermo gravimetric analysis, X‐ray diffraction and transmission electron microscopy. It was found that the structure and morphology of MgO nanopowders…
The electrical characteristics of hybrid super capacitor were evaluated by synthesizing LTO (Li 4 Ti 5 O 12 ) using TiO 2 having a hydrogen titanate nanowire form. Preparation of the hydrogen titanate nanowire was implemented by using TiO 2 having size of 60 nm and NaOH, and performing synthesis at 70 °C for 6 h with…
The influence of heat treatment on the structural uniformity, degree of residual-austenite decomposition, working-layer hardness, and residual-stress distribution in two-layer high-chromium rollers is studied in production conditions. A new method is proposed for the cyclic heat treatment of two-layer rollers.
Carbon nanowalls (CNWs) consist of walls of thin graphite with thicknesses of a few tens of nanometers that stand vertically on a substrate. For modification of their structure after growth, we developed a method utilizing etching with oxygen atoms generated by an inductively coupled oxygen plasma. We found that oxyge…
Objective(s): To evaluate the influences of aqueous extracts of plant parts (stem, leaves, and root) of Portulaca oleracea L. on bioformation of silver nanoparticles (AgNPs). Materials and Methods: Synthesis of silver nanoparticles by different plant part extracts of Portulaca oleracea L. was carried out and formation…
The Special Power Excursion Reactor Test III (SPERT III) was a series of reactivity insertion experiments conducted in the 1950s. This paper describes the validation of the U.S. NRC coupled code system TRITON/PARCS/TRACE to simulate reactivity insertion accidents (RIA) using several of the SPERT III tests. The NRC cou…
We consider possibility of the self-organization of crystals during the plastic deformation in the form of band-structure elements — MBs and SBs. They contribute to prolongation of the deformation under the dislocation slide braking whereby the hydrodynamic flow within the MBs and SBs. The distinctions between the pro…
Angiostrongylus cantonensis is an important causative agent of eosinophilic meningitis and eosinophilic meningoencephalitis in humans. MicroRNAs (miRNAs) are small non-coding RNAs that participate in a wide range of biological processes. This study employed a deep-sequencing approach to study miRNAs from young adults…