Materials Literature
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Analysis of a hypothetical core disruptive accident is important in the safe design of the future generation of reactors such as liquid-metal-cooled reactors. This study determines the fundamental mechanisms underlying the penetration and freezing behavior of molten metal flowing through a sevenpin channel. We conduct…
Thermal expansion behavior was investigated for tangusten zirconium phosphate (Zr 2 (WO 4 )(PO 4 ) 2 (ZWP)) particulate filled poly(ether ether ketone) (PEEK) composite. ZWP is known as ceramic filler with a negative thermal expansion. By incorporating ZWP with 40 volume %, the linear thermal expansion coefficient of…
The effect of direct-current (dc) biasing on the dielectric properties of porous Ba0.6Sr0.4TiO3 with various porosities, pore sizes, and different pore shapes has been studied in the paraelectric state. The existing model did not consider the effect of the change in grain size and pore shape, lead to the theory fittin…
This paper addresses the uncertainties associated with using carbon nanotubes (CNTs) as reinforcement for cement. These uncertainties emerge mainly from the CNTs' wide range of mechanical properties and their interfacial behavior with cement. This study sheds light on the basis of choosing the optimal combinations of…
xDNA constitutes a novel class of size expanded synthetic nucleic acids in which one of the bases of the base pairs is larger than the natural DNA bases. These expanded bases are called x-bases. In this paper, we investigate the hydrogen bonding characteristics and relevant molecular properties of model complexes (xA.…
This paper reports on the results of an experimental investigation into the dielectric properties of a new composite ceramic material BSM, whose tunability increases with increasing concentration of the composite magnesium-containing additive. The main applications of the ferroelectric ceramic material in the accelera…
Processes of tree initiation and growth in LDPE/MgO nanocomposites were investigated by using optical and partial discharge (PD) detection methods. They can be divided into three stages depending on tree length. The first stage corresponds to the initial growth of about 10 ¿m and might be subtly affected by the filler…
Peripheral nerve regeneration can be significantly enhanced by the distribution of the extracellular matrix (ECM) proteins at an increasing concentration along the length of a scaffold. In this study, we have created a gradient of an extracellular matrix protein, laminin, on nanofibrous scaffolds using an external mag…
A metamaterial that is formed by two types of spherical particles of different diameters has been considered. The particles are prepared from a ferroelectric ceramic material with a high permittivity (ɛ ≥ 400), so that the electromagnetic field inside the particles obeys the electrodynamic laws and the external field…
Polyamide-imide (PAI) materials appear as potential candidates for the encapsulation of wide band gap semiconductor power devices operating at high temperature (>200°C). However, electrical properties of PAIs are under-known compared to those of polyimides (Pis). We propose to evaluate the dielectric properties of two…
Ce3+, Tb3+ and Ce3+ plus Tb3+ doped BaZn2(PO4)2 phosphors were prepared by a solid-state reaction under reductive atmosphere. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) techniques confirmed the formation of BaZn2(PO4)2 crystal phase. BaZn2(PO4)2:Ce3+ showed the parity and spin allowed…
We are developing an innovative ZrCo hydride bed design, which is characterized by a large cylindrical filter, very thin cylindrical metal hydride powder packed layer, and large relative heating area per unit weight of ZrCo powder for ITER fuel cycle application. To validate this design concept, two ZrCo bed models ea…
It is found that the absorption and luminescence spectra of CdSe nanocrystals and nanorods depend on the external electric field. It is shown that the external electric field quenches the P -polarized photoluminescence of CdSe nanorods to a degree higher than the degree of field-induced quenching of the S -polarized p…
Abstract Mountainite was described as a new mineral in 1957 with formula (Ca,Na 2 ,K 2 ) 16 Si 32 O 80 · 24 H 2 O; its crystal structure was not solved up to now. We studied the structure of mountainite from the Yubileinaya pegmatite, Lovozero alkaline complex, Kola Peninsula, Russia. Mountainite is monoclinic, P 2/ c…
Reduction processes of WO 3 nanopowder either with carbon or with hydrogen were observed using X-ray powder diffraction and transmission electron microscope. The phase transformations, separation, grain size and electrical conductivity of WO 3-x nanopowder during reductions via partial pressure high energy ball-millin…
The effect of excitation power on the photoluminescence (PL) of three types of ZnO samples, including a polycrystalline pellet, thin film, and nanowires, was investigated. The intensity ratio of the defect to band edge emission as well as the overall spectral line shape of the defect emission was strongly affected by…
It is shown that in graphite the spectral density of phonons polarized along the c axis has a V shaped feature similar to the so-called Dirac singularity characteristic of the electron density of states in graphene. The formation of quasilocal states, which increase the occupation of the quasiparticle levels near this…
The principles of dielectric spectroscopy are reviewed and the techniques in both time and frequency domains are explored in search of appropriate methods for measurement on low loss XLPE cables. By combining the techniques of frequency response analyzer, transformer ratio bridge and discharging current measurements,…
Abstract Enhancement of the physico-chemical properties of elastomers can be achieved by the addition of fillers, such as silica, but the search for less expensive alternative materials continues. The objective of this study was to investigate natural or organically modified clay minerals as such an alternative. Organ…
emical (EPM data), TG–DSC studies and structural investigations indicate that mosandrite presents a particular chemical \ncomposition (low Ca, Na and F contents, high amount of H2O), unit-cell parameters (a 7.398, b 5.595, c 18.662 Å, b 101.37°, \nV 757.29 Å3; space-group symmetry P21/c; Z = 2), and a rinki…