The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The paper is dedicated to the methods and results of the simulation of thermal radiation from heterogeneous combustion products of peat burning in power plants. The source data comprises the chemical composition, optical properties, and dispersivity of ash peat particles. The calculation of the gaseous phase components was made based on the thermal characteristics of the source fuel. The results of...
Heat dissipation has become one of the biggest challenges to improving the performance, reliability and power density of electronic devices. One of the crucial components in electronics packaging that must be further developed to address this challenge is thermal interface materials (TIMs). Recently, packed SiO2 nanoparticles, which could serve as TIMs when embedded in a polymer matrix, have been...
Poly (3-hexylthiophene) (P3HT) thin films were spin coated onto plain glass and ITO coated glass substrates to study their optical and photoelectrical properties respectively. Optical studies were done using Uv-vis radiation to study the absorption and the band gap. Photoelectrical properties of P3HT were studied by noting the resistance variation with respect to light. Rapid decrease in resistance...
The ZnO thin films were deposited by spray pyrolysis technique on glass substrate heated at 450° C, using as source zinc acetate with a molar concentration of 0.05 mol/l. Our interest is to study in some details the effect of doping Gd:ZnO (GZO) and co-doping Gd,Li:ZnO (GLZO) on optical properties. For this, we have used the optical UV-Visible spectroscopy to determine the band gap energy of the samples...
We have investigated theoretically the optical absorption and magnetic properties of Mn doped 4H-SiC, using the first principal calculation, based on Full Potential Linearized Augmented Plane Wave (FPLAPW) method of Density Functional Theory (DFT). The obtained results indicating that optical absorption increasing at visible light region as function manganese concentration doped 4H-SiC, also the Mn...
In this study, we compare the structural properties of the three phases wurtzite (B4), zinc blende (B3), and rocksalt (B1) of ZnO using the generalized gradient approximation (GGA) and the modified Becke-Johnson TB-mBJ potential to compare their electronic and optical properties. It's found that the wurtzite phase is energetically the most stable. Zinc blende and wurtzite structures show similar electronic...
In our current research, thin films of Copper oxide (CuO) were deposited on copper plate in an electrolytic bath containing CuSO4.5H2O, 3M lactic acid and NaOH by electrodeposition process. CuO thin films were electrodeposited at different voltage and different temperature whereas bath concentration, pH and time were kept constant. The characterization of the CuO thin films deposited at different...
Dy3+ ion embedded in 50Li2O ∶ 20CaO ∶ (30−x)B2O3 ∶ xDy2O3 (x = 0.00, 0.10, 0.30, 0.50, and 1.0 mol%) glass matrices are prepared and investigated their optical absorption and photoluminescence (PL) as a function of different concentrations of Dy3+ ions. Based on the Judd-Ofelt theory, three spectral intensity parameters Ωλ (λ = 2, 4, 6) are calculated from absorption spectra. The PL spectra show two...
In the present study the results of an ab-initio theoretical study of the electronic structural and optical properties corrected by scissor of zinc oxide in wurtzite phase using an implementation of the FP method(L) APW in the framework of the density functional theory (DFT); the potential for exchange and correlation is treated within the generalized gradient approximation of the Engel-Vosko GGA-EV...
First principles calculations were performed to study the electronic structures of Magnesium diboride (MgB2) bulk and nanosheet with different layer and thickness in order to understand the influence of layer number and thickness on electronic and optical properties for this compound, using the Full Potential Linearized Augmented Plane Waves (FP-LAPW) method with the Generalized Gradient Approximation...
The noble material platinum nitride (PtN) was studied by means of first-principle calculations. The electronic and optical properties were calculated in order to learn the peculiar characterize of this compound. The platinum nitride has the rock-salt structure which can only been synthesized in the laboratories. There must be some special hybridization between platinum and nitride that combine the...
The plane wave pseudo-potential method within density functional theory (DFT) has been used to investigate the structural, electronic and optical properties of ZnGeAs2 chalcopyrite semiconductor. The lattice constants are calculated from the optimized unit cells and compared with the experimental values. The band structure, total density of states (TDOS) and partial density of states (PDOS) have been...
Nanocrystalline titanium-manganese mixed oxides (TMMO) with Mn content of 13–16 at. % were first synthesized by manganese hydroxide precipitation on anatase or rutile particles. UV-vis absorption spectra were investigated in 2.4–6.0 eV region and revealed that compared with pure TiO2 the presence of manganese oxides results in an increase of the absorption intensity and significant red shift of the...
Novel blue light-emitting materials were designed by the substitution at the 4-position of 1,8-naphthalimide with electron-donating phenoxy group. The effect of molecular structure on the photophysical, electronic structure properties of the derivatives was explored by UV-visible absorption spectroscopy, photoluminescence spectroscopy, cyclic voltammetry and quantum chemical calculations. Both UV-visible...
Amorphous carbon (a-C) thin films was deposited using Aerosol-Assisted CVD (AACVD) method and the properties was discussed. Flow rate of the experimental setup was varied (15, 30, 45 and 60 bubbles per minute) in order to optimize the a-C thin film characteristics and the electrical, optical and structural properties were investigated. The electrical properties was characterized by current-voltage...
β-FeSi2 films were deposited on silicon substrates by RF-sputtering method with a Si-rich FeSi4 target and optical absorption properties of the films were investigated. Direct bandgap of the β-FeSi2 films deposited using an FeSi4 target was larger than that using an FeSi3 target because Si crystals were formed in the films deposited using a Si-rich FeSi4 target.
The increase in frequencies and the noxious effects of HABs in global coastal waters have led to enhanced interest in monitoring and detecting of such blooms. In December 2009, a toxic bloom hit Singapore waters along East Johor Strait causing massive fish kills and great economic losses. Interdisciplinary approach involving robotic network adaptation, multi-scale-sensing using autonomous vehicles...
Gallium doped zinc oxide, GZO, thin films have been deposited onto glass substrate by RF magnetron sputtering at various substrate temperatures. The electrical and optical properties of the thin films have been studied as a function of substrate temperature. X-ray diffraction was used in order to investigate thin film structures. The thin film structure was stabilised by heating the samples in air...
The invasive algae in the Mediterranean Caulerpa taxifolia and Caulerpa racemosa var. cylindracea have gained much interest in the Adriatic Sea due to their fast spread and negative impacts on native seaweed species. Lack of accurate mapping and its overall high costs present some of the major difficulties for successful detection and subsequent environmental management. Remote sensing techniques...
A facile route to synthesis silver nanoparticles into polyvinylpyrrolidone (PVP) or silica (SiO2) matrices using sol-gel method has been developed. The influence of matrices on the size and optical properties of silver nanoparticles were studied. Because the particle size increases at different rate with silver nitrate (AgNO3) concentration in different matrices, there is an up-limit for AgNO3 concentration...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.