Materials Literature
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Possibility of preparation of transparent nanostructured glass crystalline materials based on fluorophosphate glasses with high fluoride content is demonstrated. The influence of concentration of rare earth ions (REI) on the crystallization process is studied. We determined the conditions of heat treatment to form nan…
Porous-layer capillary columns with a hybrid organic-inorganic sorbent based on structured silica are described. Properties of the prepared columns are discussed. Examples of separating C 1 –C 4 hydrocarbons and a mixture of solvents on the obtained columns are presented. It is shown that changes in the organic compon…
An antenna design to increase the directivity of a terahertz (THz) photomixer used as a THz source is presented. The antenna is consisted of a full-wavelength dipole on a GaAs membrane substrate and covered by a frequency-selective surface (FSS). The perfect mirror of ground plane and the partially reflective mirror o…
State of the art LED pico-projectors using single-channeled optical layouts are always constricted by a trade-off between achievable flux and minimum system size. Furthermore, their limited depth of focus require additional mechanically moving components for focusing if variable projection distances are essential for…
The number of situations where it is necessary to intervene in existing structures is increasing. In Spain, rehabilitation and maintenance of buildings accounts for 30% of the activity of the construction sector and it is growing. This paper evaluates the residual safety of T prestressed joists with severe corrosion a…
The results of studying the effect of electrothermopolarization on the electret properties and charge state of PE + Cr and PE + PbCrO4 composites are described. It is shown that an increase in the polarization field intensity to E p = 5 × 106 V/m leads to an improvement in the polarization processes in the composites;…
A combined supercapacitor and electrolytic capacitor energy storage system offers efficiency improvements in excess of 10% when compared to a supercapacitor-only storage system used in short-duration (<;1s), high-current discharge applications. The technique is suited to distributed generation applications where low-v…
The short glass fiber (SGF)/polypropylene (PP) composites were prepared by extrusion and subsequently injection processes. The evolution of phase structures and mechanical properties of SGF/PP composites were performed using scanning electron microscopy (SEM), contact angle tensiometer, universal testing machine and i…
The most power quality disturbances such as voltage sag and swell that occur in the distribution side can be compensated by using custom power device dynamic voltage restorer (DVR). This paper describes the techniques for compensation of voltage sag and voltage swell by DVR based on Voltage Source Converter (VSC). Vol…
The analysis of the type material of Pinnularia divergentissima (Grunow in Van Heurck) Cleve revealed the presence of two distinct Pinnularia taxa in the same slide. Comparison with the original drawing of P. divergentissima by Grunow showed that recent taxonomic treatments of P. divergentissima are not in accordance…
Carbon nanotubes (CNTs) are said to be among the most potential materials in applications of nanodevices, nanocomposites and nanostructure due to their excellent mechanical and physical attributes. CNTs were first discovered by S. Iijima in 1991 where he has reported in his article the synthesis of needle-like tubes b…
Bulk glasses of xNb2O5(1-x)La2O3(NL) with high refractive index were prepared by aerodynamic levitation method. Only when x ranges from 0.62 to 0.72, NL glasses can be obtained. The effect of compositions on the thermal property and refractive index was investigated. The results indicated that the glass transition tem…
This paper deals with a new High Frequency Transformer Model HFTM, taking into account magnetic core and fractionated winding. For electromagnetic transient phenomena, capacitive effects are considered by a series of capacitors among different transformer elements. This model has been tested using excitation by ramp o…
This investigation examines a fundamentally new type of thermal interface material (TIM) based on a double-sided array of tin nanowires (NWs) prepared using a hot-pressing approach with the assistance of anodic aluminum oxide templates. The metal based TIM effectively reduces the contact resistance, while the flexible…
Abstract In this work, a method was investigated to eliminate the presence of undesirable Al4C3 phases in a high-aluminium alloys, and thus improve the production process. The melting conditions employed in this work enabled the formation of a Fe-Al-C liquid solution. Moreover, titanium additions into the liquid allow…
Abstract HgO7S2, monoclinic, P21/n (no. 14), a = 5.1467(2) Å, b = 12.9327(4) Å, c = 8.2178(3) Å, β = 92.519(1)°, V = 546.5 Å3, Z = 4, Rgt(F) = 0.0170, wRref(F2) = 0.0450, T = 153 K.
Abstract The effect of C60 fullerene on the expression levels of genes, related to endoplasmic reticulum stress and cell proliferation, in human astrocytes was investigated. The exposure of human astrocytes to C60 fullerene during 24 or 72 h increases the expression levels of transcription factor E2F8, insulin‐like gr…
Lead sulfide (PbS) nanoparticles have been synthesized by photo chemical method and also in the dark ambient at room temperature. The pH of the solution is maintained by adding NaOH. The as-prepared PbS nanoparticles have been characterized by X-Ray Diffraction (XRD), Scanning electron microscopy (SEM), Energy-dispers…
A survey of radiation modeling and circuit simulation approaches that are essential for stockpile stewardship.
The aim of the paper is to analyse how different mechanical properties of bonded metals influence the cyclic behaviour of bimetallic components. The simulations also include different initial state of stress since one of the methods for manufacturing bimetals is explosive welding which introduces residual stresses int…