Materials Literature
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We review and concurrently discuss two recent works conducted by us, which apparently give opposite results. Specifically, we have investigated how extreme thermal histories in glasses can affect their universal properties at low temperatures, by studying: (i) amber, the fossilized natural resin, which is a glass whic…
Solid oxide fuel cells (SOFC) can be used for both distributed electricity generation and cogeneration purposes. They have higher efficiency and certain other advantages over proton exchange membrane fuel cells. However an important weak point of SOFC cells is their lifetime and durability. In particular, high tempera…
Sulfur-doping in graphene is of great importance because it could not only open the band-gap of graphene, but also improve the adsorption of NO2over graphene. In this paper, a simple but efficient strategy was demonstrated to dope S atoms in graphene by introducing hydrogen sulfide gas flow as sulfur source at 1000°C.…
On the basis of the experimentally obtained structure of the magnetic phase of the PrMn 2 O 5 oxide, it is found that in the temperature interval from 18 to 25 K, a transition to this phase should be analytically described by a two-component order parameter and that the effective Hamiltonian of the system should conta…
Impact welding enables metallurgical bonding even between dissimilar metals. The bond is formed during a high speed impact between the two workpieces to be joined under accurately defined conditions. In the application, the accelerating force is provided by an explosive (explosion welding, EXW) or by an electromagneti…
The review reports studies of PHA biodegradation behavior in natural freshwater and marine environments. The factors determining polymer degradation rates in water basin include the temperature and the mineral component of the water, the structure of the aquatic ecosystem and bacterioplankton composition. Anaerobic de…
Owing to its excellent mechanical, thermal, and optical properties, sapphire (crystalline Al 2 O 3, alpha alumina) is extensively used to make optical windows for harsh conditions, for example, underwater surveillance in the oil industry. However, under these conditions the sapphire surfaces are continuously exposed t…
The uneven distribution of voltage along the composite insulator strings harmed their electrical and mechanical properties heavily, which threatened the safety of power system. Inserting metal electrodes in the silicone rubber sheds of composite insulator helps increase their self-capacitance, thereby ameliorating the…
Stabilized polypyrrole dispersions were prepared by oxidative polymerization of pyrrole in aqueous solution of polyvinyl alcohol. The influence of the concentration and molecular mass of polyvinyl alcohol in the reaction mixture on the size of the particles formed was examined, and the particle structure was determine…
Pseudoboehmite (PB) were synthesized through the sol-gel process, using aluminum nitrate as precursor. The pH adjustment of the precursor solution was made by using ammonium carbonate. After the precipitation, the material was dried at 70°C before characterization. The pseudoboehmite obtained were characterized by x-r…
Silver nanoprticles (SNPs) are invested in medical, industrial and environmental applications. Little if any, is known about the morphometric alterations induced by the toxicity of SNPs. The aim of the present work is to find out the effect of variable size of SNPs on different morphometric parameters. Adult healthy m…
Breakthroughs can be expected in multi-component ceramics by adjusting the phase assembly and the micro–nanostructure. Controlling the architecture of multi-materials at different scales is still challenging and provides a great opportunity to broaden the range of functionalities in the field of ferroelectric-based ce…
Complex core/multi-shell quantum dot (QD) configurations can be used to tailor light absorption and emission properties. We present a core/shell/shell/shell structure designed to implement efficient photon upconversion. We report on the design and characterization of two intermediate products that could progress to im…
CaMoO 4 :Eu 3+ red phosphors were successfully synthesized by using a high-energy ball milling method. The X-ray diffraction patterns confirmed their tetragonal structure, and the field emission scanning electron microscopy images exhibited spherical particles. The photoluminescence properties (PL) of CaMoO 4 :Eu 3+ p…
The effect of physical ageing process on the electrical and thermal properties of amorphous and semi-crystalline PEN was investigated by means of the thermally stimulated depolarization currents (TSDC) and the differential scannig calorimetry (DSC). The TSDC measurements revealed a significant decrease in the mobility…
Phytoplankton Channel El Bordo in Xochimilco was studied during the 2008 rainy season and the dry season of 2009. The objective was to determine the stability of the flora of an area requiring remediation. The results of this study showed a diverse composition of phytoplankton, which highlighted the registration of se…
Bi 2 Te 2.7 Se 0.3 was prepared by mechanical alloying (MA) and hot pressing (HP), after which the effects of HP temperature on the transport and the thermoelectric properties were evaluated. Bismuth chalcogenide phases were synthesized afterMA for 4 h, and no secondary phases were observed. The relative densities of…
This paper presents a new method for evaluation and simulation of inrush current in various transformers using operational matrices and Hartley transform. Unlike most of the previous works, time and frequency domain calculations are conducted simultaneously. Mathematical equations are first represented to compute the…
Thermoelectric generators (TEG) are devices that generate electricity when a temperature gradient is created across it. Therefore these generators can be used to power micro-scaled devices by harvesting the heat that is released to the environment in different systems. This work presents the Finite Element (FE) model…
In the spectrum of reflection magnetic circular dichroism (MCD) of Ga1−xMnxAs, the E0 peak energy, which is assigned to the band gap of GaMnAs, is higher than the band gap energy of GaAs. In the past, this blue shift was attributed to the Moss-Burstein effect, in which the Fermi level moves toward lower energy in the…