Materials Literature
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We present the realization and characterization of an active spherical diffraction grating with variable radius of curvature to be used in grazing-incidence monochromators. The device consists of a bimorph deformable mirror on the top of which a diffraction grating with laminar profile is realized by UV lithography. T…
Abstract A review on the growth and characterization of site‐selective quantum dots (QDs) is presented. First, a theoretical model is used to describe the mechanism leading to the formation of QDs at pre‐defined locations. The structural properties of site‐selective QDs was revealed and their optical quality was teste…
Ultrathin doped layers, known as delta-doped layers, were introduced within the intrinsic amorphous silicon (a-Si) active layer to fabricate hydrogenated amorphous silicon (a-Si:H) thin-film transistors (TFTs) with enhanced field-effect mobility. The performance of the delta-doped a-Si:H TFTs depended on the phosphine…
Here, we show that some organic solvents can act as electric double layer (EDL) gate media for thin film transistors (TFTs), in a similar way to solid electrolytes, ionic liquids, and water. The ability to act as gate medium is a property of the solvent, not a property of the semiconductor used in the TFT. Only solven…
This paper presents experimental results of a negative electron affinity (NEA) electron emitter using a diamond p-i-n diode which achieves a power transmission efficiency of 73.7 % at 10 kV during RT operations first time. This result proves that a vacuum switches of 100 kV made of diamond can be operated beyond 99.9%…
The electronic and optical properties of the defect chalcopyrite CdGa2Te4 compound are studied based on the first-principles calculations. The band structure and density of states are calculated to discuss the electronic properties and orbital hybridized properties of the compound. The optical properties, including co…
As shown in several studies, various properties of biomaterials such as stiffness, surface roughness, chemical composition or the amount of functional groups at the surface can influence adhesion, viability, proliferation and functionalities of cells. The aim of this work was to explore whether a cell-selective effect…
Con el fin de estimar la factibilidad de reforzar una matriz de almidón termoplástico (TPS) con fibras de Fique, se efectuaron pruebas de micro-mecánica mediante la técnica de zafado de una fibra (pull-out). El TPS se obtuvo a partir de la plastificación, con glicerol, de un almidón nativo de yuca (manihot sculenta Cr…
In this paper an analysis of phenomena of laser welding of steel thin-walled element is presented. Coupled mathematical and numerical models of thermal phenomena, mechanical and phase transitions in solid and liquid state are proposed. To the modeling of phase transformation in the solid state the macroscopic model ba…
The chemical composition of a substrate can influence the adhesion, viability and proliferation of cells seeded on the substrate. The aim of this work was to investigate the influence of different cationic or anionic moieties in acrylonitrile-based copolymers on the interaction with fibroblasts. A series of ten differ…
Se-doped ZnO lms have been deposited on the sapphire substrates by the radio-frequency magnetron sputtering technique. An inuence of the isoelectronic impurity Se on the room-temperature luminescence of the ZnO lms is studied. It is revealed that the Se doping leads to an appearance of the intense near-band edge emiss…
Surface changes of electrochemically-grown polypyrrole films on vitreous carbon substrates are analyzed by atomic force microscopy (AFM) as a function of the pH of the source solutions. Thick films are obtained when using H2SO4 (i.e., 8.035 μm thick when grown at constant potential, CP and 0.157 μm thick when grown by…
A critical need in the field of nanotechnology is the development of a reliable and eco-friendly process for synthesis of metallic nanoparticles. A number of different organisms, including bacteria, microalgae, yeast and fungi, have shown their ability to produce metal nanoparticles. But they have some drawbacks in pr…
In this work, the electrochemical sensor based on graphene/ copper phthalocyanine(CuPc)/ polyaniline(PANI) nanocomposite modified screen printed electrode(SPE) for detection of ascorbicacid (AA) was successfully fabricated. Copper phthalocyanine was immobilized on graphene by using PANI as a matrix. The nanocomposites…
Owing to the nonlinear characteristics, electric arc furnace (EAF) loads can result in serious electrical disturbances such as harmonics and voltage flicker in power system. Amplitude modulation of the supply voltage in the frequency range of 6–10 Hz created by EAF can cause annoying fluctuations of the electric light…
In this paper we introduce, for the first time, a compact and dual band substrate integrated waveguide metamaterial impedance transformer. The proposed transformer has been proposed to functions at bandwidth from 4.5 GHz and 6.5 GHz for all possible upper WiMAX frequencies. The design procedures supported by the analy…
Stephanopyxis is a cosmopolitan planktonic marine diatom genus. It comprises a large number of fossil species but only four living species: S. nipponica, S. orbicularis, S. palmeriana and S. turris. In this study, the morphology and occurrence of Stephanopyxis species were studied by means of light and scanning electr…
Article MECHANICAL PULPING: The influence of fiber dimensions on mechanical pulp long fiber tensile index and density was published on December 1, 2012 in the journal Nordic Pulp & Paper Research Journal (volume 27, issue 5).
Aluminum sulfate nano structures have been prepared by solution combustion synthesis using aluminum nitrate nonahydrate (Al(NO3)3.9H2O) and ammonium sulfate ((NH4)2SO4). The resultant aluminum sulfate nano structures were calcined at different temperatures to study thermal decomposition of aluminum sulfate. The crysta…
Abstract In this paper results of microsegregation in the newly developed nodular cast iron with carbides are presented. To investigate the pearlitic and bainitic cast iron with carbides obtained by Inmold method were chosen. The distribution of linear elements on the eutectic cell radius was examined. To investigate…