ChemInform Abstract: Solution‐Processed Two‐Dimensional MoS2 Nanosheets: Preparation, Hybridization, and Applications
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Energia nuclear: vantagens e desvantagens
A humanidade, da maneira como se desenvolveu, depende cada vez mais de energia para a sua subsistencia. Ate a era da revolucao industrial, o consumo de energia no mundo aumentou de forma atenuada sendo que nos ultimos 50 anos a demanda global de energia triplicou e podera triplicar novamente nos proximos 30 anos. Dest…
Calculation and optimization for UHV AC GIS spacer in electrical and mechanical fields
Epoxy spacers play supporting conductors, isolating chambers and electrical insulation roles in gas insulated switchgear (GIS), affecting the insulation level and equipment lifetime of GIS. Inappropriate configuration of GIS spacer will not only lead to flashover or partial discharge when imposed by high voltage but a…
Partial discharge feature extraction through contourlet transform for XLPE cable defect models classification
Partial discharge feature extraction is an important processing procedure in XLPE cable defect models classification. For feature extraction in the wavelet domain, the energies of subbands are usually extracted. However, the energy of one subband is just a specific feature. In this paper, we propose an efficient featu…
Effect of Thickness in Carbon Nanotube Electrode Layer for Electrochemi-Luminescence Cells Applications
The nanoelectrode layer in electrochemi-luminescence (ECL) cells can be improved the performance of light intensity.In this work, the ECL cells were fabricated using carbon nanotubes (CNT) and Ru(II) complex as a luminescent material.We reported to the effect of the thickness of the CNTs layer in ECL cell.The produced…
Broadband transparent metasurfaces for full phase shift and polarization control
We have achieved a broadband transparent metasurface useful for full phase control and conversion from linear polarization to any elliptical polarization. This can be applied in the field of telecommunications to obtain circular polarized signals, taking advantage of that every other polarization state can be decompos…
Possibilities of modification of polymer/SiO2 composite by various types of carrier
The main aim of this paper is to describe possibilities of modification of polymer insulating materials by various types of carrier. The major problem of currently used insulation system is their inhomogeneous structure. Therefore, there is an efforts to develop material that is macroscopically homogeneous. New compos…
Ultrasonic streaming and cavitation for nano particle dispersion
Recently, non-contact type ultrasonic dispersion technique is attracting attention in various industrial fields. To disperse the nano particle suspension effectively, new dispersion system was suggested using arrayed piezoelectric vibrators with high resonant frequency. The suggested system has high intensity ultrason…
Dielectric properties of ferroelectric composites (NaNO2)0.95/(PbTiO3)0.05
The temperature and frequency dependences of dielectric properties of the ferroelectric composite (NaNO2)0,95/(PbTiO3)0,05 near the phase transition of sodium nitrite have been studied. A significant increase in the real part of the dielectric constant at low frequencies and its strong decrease with increasing frequen…
On the 2D Quantum Tunneling
In this paper, we have solved a quantum tunneling problem for 2-dimensional systems, including electron gas and graphene. In spite of the one-dimensional scattering problems, in two dimensions, we observe phenomenon of tunneling at energies above the barrier. This effect is an analogue to the total internal reflection…
The Impact of the Dislocation Density, Lattice and Impurity Friction on the Dynamics of Expansion of a Dislocation Loop in FCC Metals
The study of the role of various factors in plastic behavior of materials is carried out using a mathematical model that takes into account fundamental properties of deformation defects in a crystal lattice based on the continuum theory of dislocations. Calculations were performed for copper, nickel, aluminum, and lea…
Dynamics of Thin-Walled Elements of Rocket Engine under Impact Loads
Stress-strain analysis of a solid-propellant rocket engine is the subject of this study. A chosen material is selected in order to ensure its maximum strength at minimum weight of the engine. The airframe of the rocket engine is a thin-walled structure, which consists of cylindrical and spherical parts. The dynamic be…
"Ship-in-a-Bottle” Synthesis of Fluorescent Iridium (III) Complex Ion unto Zeolite Y Supercages
Incorporation of photosensitizer complex, Ir (bpy) 3 3+ inside zeolite Y supercages was done via “ship-in-a-bottle” synthesis method. Elemental analysis of the Ir (III) exchanged – zeolite Y showed that the ratio of Ir to Al to Si (Ir:Al:Si) was 1:1.6:2. The light-harvesting ability of the iridium complex has been obs…
The Study of Aging Cold Rolled and Hot Dip Galvanized Automotive Steel
This paper provides the study of aging hot dip galvanized rolled products of low-carbon high-resistance automotive steels featuring good formability, weldability and dent-resistance. The authors carried out the experiment to obtain data on the period of warranty of mechanical properties of rolled products manufactured…
Ceria‐Based Nanocatalysts: Recent Progress in Well‐Controlled Synthesis of Ceria‐Based Nanocatalysts towards Enhanced Catalytic Performance (Adv. Energy Mater. 17/2016)
In article number 1600501, Chun-Hua Yan and co-workers provide an overall review of substantial developments in controlled synthesis and catalytic applications of ceria based nanocatalysts in both environmental and energy related fields. The upper Chinese knot in this image shows the crystal structure of cerium dioxid…
Physical description and analysis of doped carbon nanotube interconnects
Ever since the discovery of graphene, the 2D carbon structure material has been attracting a lot interest due its electrical, thermal and mechanical properties. Here, we investigate the carbon nanotubes (CNT), wrapping a 2D graphene sheet to form a 1D carbon structure. CNT has a Dirac-cone energy band, which makes it…
Influence of nano-Al<inf>2</inf>O<inf>3</inf> on electrical properties of insulation paper under thermal aging
Composite papers (hand sheets) with 2wt% nanoAl2O3doped and blank papers were prepared and the accelerated thermal aging test under 130oC with oil-blank paper and oil-composed paper were performed. The main electrical parameters of paper were tested. According to corresponding data analysis, it can be concluded that t…
Transparent terahertz metamaterial with a refractive index of zero
It is commonly believed that most of naturally occurring transparent materials have small positive refractive indices around 1 in the terahertz waveband. However, metamaterials have made a paradigm shift and achieve the design of man-made materials with both on-demand electromagnetic properties and unprecedented refra…
Diagnostic and acceptance tests of AC long lengths high voltage power cables
Test procedures and on-site diagnostics of high voltage power cables are one of the main problems of asset management carried-out by power utility companies. It is obvious that cable lines are very important components of the transmission network. So it is very significant to check the initial condition of cables carr…
Nonlinear conductivity and space charge behaviors of SiR/SiC composites
High temperature vulcanized (HTV) silicone rubber (SiR), due to its excellent electrical insulation, elasticity and temperature resistance, is used in cable accessories for HVDC cables. The space charge, generated under dc stress in SiR, would distort the local electric field, furtherly influencing the characteristics…