查看更多>>摘要：A (2+1)-dimensional coupled NLS model with the partially nonlocal nonlinearity under harmonic and linear potentials is focused on. In order to find matter wave solutions, a correspondence between variables in the nonautonomous equation and variables in the autonomous equation is erected. With the help of this correspondence, and by employing the Hirota's bilinearization method, vector bright-dark one-soliton and two-soliton solutions are analytically derived.
Al-Buriahi, M. S.Alrowaili, Z. A.Eke, CanelAlzahrani, Jamila S....
10页
查看更多>>摘要：Three TeO2-ZnO-Na2O ternary glass samples with chemical formula 80TeO(2)-xZnO-(20-x)Na2O (where x = 20, 10, and 0 mol% represents TeZnNa1, TeZnNa2, and TeZnNa3 respectively) were investigated for their optical and radiation shielding attributes. The calculated optical parameters namely structure molar refractivity (R-Mol), molar polarizability (alpha(Mol.)), reflection loss (R-Loss) and optical transmission (T-Opt.) all vary with the chemical content of the glasses. The FLUKA Monte Carlo code and XCOM software was used to estimate mass attenuation coefficient MAC of the glasses. Furthermore, the fast neutron absorption probability sigma(R) was estimated through standard expressions. The MAC values varies between 0.03796 and 0.16191 for TeZnNa1, 0.03793-0.16206 for TeZnNa2 and 0.03791-0.16221 cm(2)/g for TeZnNa3 as photon energy changes from 284 keV to 2.506 MeV. Analysis of other photon shielding parameters such as effective atomic number and mean free path showed that TeZnNa3 is the best shield among the glasses. The sigma(R) of the glasses also changed from 0.0942 to 0.1117 cm(-1) as Na2O content increased from 0 to 20 ml%. The photon and fast neutron removal cross section of the glasses compared relatively well with standard radiation shields. The glasses are hence, can be used for radiation absorption purposes.
查看更多>>摘要：The following article aims to investigate the influence of porphyrin (PP) on the crystallinity, electronic structure, and optical properties of graphene oxide (GO), using the density functional theory (DFT). Theoretical calculation indicates that porphyrin substitution brings about significant distortion in the GO sheet. The substitution of porphyrin on the graphene oxide layer (GO PP), leads to decrease the bandgap of the GO material. After substitution, the absorption coefficient decreases in the UV domain and increases in the visible range. Thus, the observed redshift in absorption peaks upon porphyrin substitution was attributed to the assembly that consists of J aggregates. In this work, we explore the substitution effect of PP chain on the GO sheet as a window layer, over the power conversion efficiency of solar cells. The substitution of PP chain on the GO sheet improves the degree of power conversion efficiency of solar cells. Further comparison indicates that calculations are consistent with experimental observation, which indicates that DFT calculation at CASTEP code level gives good results of porphyrin substitution on the graphene oxide layer.
查看更多>>摘要：The application of metal nanoparticles to promote chemical reactions by catalysis is an important approach for increasing the reaction rate. For light-assisted water splitting, the utilisation of plasmonic resonance has the capability to further increase the water dissociation by means of plasmonic scattering or plasmonic catalysis. In this study, Au and Ag nanoparticles were prepared on amorphous silicon and characterised by optical, morphological, and photo-electrochemical approaches. The influence of various contributions to the reaction rate related to the presence of the nanoparticles is analysed. A significant increase of current under light conditions was achieved for both Au-and Ag-based amorphous structures. The chemical catalysis supported by plasmonic catalysis was suggested as a dominant source of the increased reaction rate. While the Au nanoparticles coverage of the surface remains the same during the characterisation, the stability of Ag nanoparticles is the key issue for practical application. Prepared Au nanoparticles exhibited stability in a harsh environment giving the perspective for practical utilisation for water splitting structures, while Ag nanoparticles showed significantly lower stability.
Yusoff, N. MohdHadi, M. A. W. AbdulAbidin, N. H. ZainolAlresheedi, M. T....
10页
查看更多>>摘要：A Q-switched mode-locked (QSML) erbium-doped fiber laser integrating aluminum oxide saturable absorber (Al2O3-SA) is demonstrated. With the help of polydimethylsiloxane polymer, Al2O3 powder was securely transferred on a tapered fiber surface and functioned as SA. A QSML pulse sequence was realized at a central wavelength of 1567.4 nm from 80 to 320 mW pump power with its envelope repetition rate ranging from 30.59 to 77.46 kHz. The short duration of 2.54 mu s Q-switched envelope comprised of 8.3 ns ML pulses with 252 nJ pulse energy was realized at the maximum pump power of 320 mW. The high damage threshold of Al2O3-SA of beyond 7 GW/cm(2) contributes to the future exploration of bulk metal oxide for high-energy optical pulse generation in near-infrared wavelengths.
查看更多>>摘要：The pulsed laser deposition (PLD) technique has been widely used to prepare and characterize Tungsten Trioxide (WO3) nanoparticles on Porous Silicon (PS) substrate produced on n-type Si (100) wafer using a Nd-YAG laser with a wavelength of 355 nm, a repetition rate of 1 Hz, and various laser ablated energy of 440 mJ, 640 mJ, and 840 mJ at room temperature. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), photoluminescence (PL), Raman spectroscopy, are used to investigate the structural and morphological, electric properties and photodetector of the WO3NPS. In high laser ablated energy of 640 mJ and 840 mJ, the XRD analysis revealed that all of the reflection peaks of WO3 NPS can be triclinic WO3 structure, and they became polycrystalline. The size of surface grains grew larger when the energy pulse was increased. Current-voltage (I-V) measures, the electrical characteristics, like the height of the barrier (phi(B)) and ideality factor (n) of Al/WO(3)NPs/PS/n-Si/Al heterojunction have been determined, as between 1.22 and 4.44 ideality factors. It was found that as the laser energy utilized increases, the photocurrent density decreases. The high responsivity curve from the photodetector device has migrated to the visible area as the energy gap has reduced. When the energy pulse was increased to 800 nm, the quantum efficiency of WO3 NPS photodetectors increased to 89%.
查看更多>>摘要：In this work, we extend the sliding mode control technology so that it can be applied to laser network synchronization. Firstly, the adaptive parameter observer is designed and the uncertain parameters in the synchronization target are effectively identified based on the extended sliding mode control technology. Furthermore, we design the laser network controller in order to achieve complete synchronization between the laser network and the synchronization target. In our strategy, the designed network controller is very simple. The complex Lyapunov function is not required, and the only work required is to determine the range of adjusting parameters for achieving synchronization. Therefore, this technology is simple and practical.
查看更多>>摘要：This paper presents the evaluation of properties like elastic moduli, shear moduli and poisson's ratio as a function of volume fraction of fibres and angle of orientation of reinforcement. The simulation has been carried out for bidirectional carbon epoxy composites. Micromechanical models like Mori-Tanaka, Self-Consistent technique are used for predictions. The application of the method shows its capability in quick prediction of properties avoiding the dependence on experimental data and reducing the design cycle time. Carbon epoxy composites were fabricated and tested at various orientations with respect to principal reinforcement directions. A good match has been obtained between the simulation and the experimental data.
查看更多>>摘要：Vectorial structure light through scattering media is attracting significant attention due to the scattering resistance and structural stability. Here we explore experimentally the propagation properties of the Ince-Gaussian (IG) vector beams through a scattering media. By using computer generated digital holography and superposition of orthogonal polarized components, we propose a vector light generator for creating of the IG vector beams. The generated third-order and fourth order IG vector beams propagate through a suspension of mono-disperse polystyrene beads with different concentrations. Full stokes parameters are measured and the experimental results show that high-order vectorial structure beams present better structural transmission stability through the scattering medium than the scalar Gaussian beams. The quantum-like correlations between the polarization and the spatial amplitude components contributes to the robustness through complex medium.
查看更多>>摘要：The determination of the octane number plays a major role in quantifying the quality of gasoline. The standard method, the international standard ASTM-CFR internal combustion engine, used for this purpose suffers from its high cost and time. Many algorithms have been developed to address the limitations of this method, taking advantage of infrared spectroscopy, which provides easily measurable parameters that can be used to predict the octane number. This paper proposes two methods to compete with three existing algorithms (ELM, IELM, and SaDE-ELM) and also aims at achieving high accuracy results compared to the engine-based measurement method. The proposed methods used ensemble learning strategy combined with ELM instead of single ELM learner, used in the aforementioned algorithms, to achieve better predictions of the octane number. The findings indicate our algorithms outperformed the existing algorithms and the predictions are very close to that of the standard method. This can be considered an important achievement in the field of octane number prediction that can eventually replace the standard method. Also, contrary to the common belief that Boosting algorithms are superior to Bagging algorithms, in this paper, we demonstrated that our Bagging algorithm performed almost identically compared with the Boosting algorithm. Despite these promising results, further research should be undertaken to investigate the Hughes effect phenomenon that the gasoline data set, used in this work, suffer from.
NSTL
Elsevier