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0030-4026

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    Desing and simulation of an autonomous 12.6 kW solar plant in the Algeria's M'sila region using PVsyst software

    Salmi M.Baci A.B.Inc M.Lorenzini G....
    5页
    查看更多>>摘要：© 2022 Elsevier GmbHSolar energy is an infinite, unpredictable and enduring energy source among all other incompatible energy options. This work simulates the feasibility of installing a photovoltaic (PV) system isolated with batteries in a typical residential center in M'sila, Algeria, where the study is carried out to assess solar radiation and evaluate the technical and economic aspects of the PV system to supply domestic electrical energy needs. The program has been implemented by PVsyst6. The daily electricity consumption is about 12.6 kWh/day. On an annual basis, the energy that is injected into the grid is 4615 kWh. The average performance ratio (PR) of the Si-poly PV system is operated at 62.9% in the simulated study for the planned location. The maximum electrical energy produced was from June to August, when it reached 354.4 kWh of July. The losses recorded in the study were principally due to temperature of photovoltaic field, which was 12.14%.
      原文链接:
    • NSTL

    Enhanced ultraviolet electroluminescence performance from p-NiO/n-GaN heterojunctions by using i-Ga2O3 as electron blocking layer

    Zhou Y.Peng W.Zhang J.Xiang G....
    5页
    查看更多>>摘要：© 2022 Elsevier GmbHIn recent years, GaN materials have been applied to the field of optoelectronic devices due to their excellent photoelectric properties, especially in the field of light-emitting diodes, which has attracted considerable attention. In this article, we use structural engineering methods to further improve the performance of GaN-based ultraviolet light-emitting diodes. The magnetron sputtering and annealing treatment were used to prepare ultraviolet light-emitting diodes based on p-NiO/i-Ga2O3/n-GaN and p-NiO/n-GaN heterojunction structure. X-ray diffractometer, field emission scanning electron microscope and ultraviolet-visible spectrophotometer were used to study the crystal quality, surface morphology, and optical properties of Ga2O3 film. Compared with the p-NiO/n-GaN heterojunction diode, the p-NiO/i-Ga2O3/n-GaN heterojunction diode exhibits better rectification characteristics and more excellent electroluminescence characteristics. Under the injection voltage of 35 V, the EL spectrum intensity of p-NiO/i-Ga2O3/n-GaN heterojunction diode is nearly 37 times higher than that of p-NiO/n-GaN heterojunction diode. Finally, the working mechanism of the electroluminescence is analyzed in detail through the energy band diagram of the two diodes.
      原文链接:
    • NSTL

    Light attenuation characteristics on a rough surface

    Sun L.
    5页
    查看更多>>摘要：© 2022 Elsevier GmbHThe geometric attenuation characteristics and geometric attenuation factor is significant for reflection on a rough surface, which describes the masking and shadowing effect on rough surfaces. When studying the attenuation of light on random Perfect Electrical Conductor (PEC) Gaussian rough surfaces using the integral equation of electromagnetics and the scattering theory, the incident state and wavelength are taken into account in this paper. The Finite Difference Time Domain (FDTD) simulation results show that light attenuation strongly related to wavelength, incident state, and rough surface topography. As a result, light attenuation can be precisely calculated, simulated, and characterized by the incident parameter and surface topography.
      原文链接:
    • NSTL

    A giantly chirality tunable terahertz metasurface based on 3D folded structure with vanadium dioxide

    Yang F.Li H.Song C.Li J....
    5页
    查看更多>>摘要：© 2022 Elsevier GmbHCompared with ordinary chiral materials, chiral metamaterials possess giant chiral optical response, which have been widely used in many optical applications, such as circular polarizers, chiral light imaging and asymmetric transmission. Here, a tunable 3D folded metasurface based on vanadium dioxide (VO2) is proposed to achieve giant chiral optical effect in the terahertz band. The 3D folded metasurface comprises of two folded antisymmetric rectangular split rings resonators (SRRs). By folding the SRRs at a certain angle, the mirror symmetric structure was broken. The results shows that the circular dichroism (CD) parameter reaches a maximum of 0.83 at the folding angle of 45° and the spin-selective transmission is up to 0.89. The designed 3D folded metasurface can operate in a wide incident angle range of 0–55°. What's more, by adjusting the conductivity of VO2, the dynamic tuning of CD can be realized, achieving the switch between the “ON” and “OFF” states. The proposed 3D folded metasurfaces provides an approach to realize the giant CD, which shows potential application in many fields, such as chiral sensing, polarization control, spin optical communication, and optical imaging.
      原文链接:
    • NSTL

    Sensing performance of temperature insensitive microring resonators with double-layer U-shaped waveguide

    Tang J.Wen H.Xiong J.Chen M....
    5页
    查看更多>>摘要：© 2022 Elsevier GmbHAn temperature insensitive microring resonator with double-layer U-shaped waveguide for sensing applications is proposed and investigated theoretically. The unique structure of microring resonator with double-layer U-shaped waveguide not only limits the light field in the ring, but also releases the evanescent field from the waveguide through the coupling of the upper and lower layers, thus enhancing the interaction between light and matter and improving the sensing ability. Then, through correctly selecting the cross-sectional dimensions of the waveguide, the bending radius, the spacing between the upper and lower waveguides and the shape of overlapping area, it is designed to have very low temperature dependence in aqueous solution, so as to obtain sensing accuracy and stability. The simulation results show that the sensitivity is 496 nm/RIU ± 5 pm/K. Within the temperature change range of 3.2 K, it can be considered that the measurement result is irrelevant to the change in ambient temperature. Compared with the other ring resonators, this resonator does not need extra temperature compensation equipment, active temperature controller, polymer cladding, or even extra processing of the measured data to eliminate the effect of temperature. Thanks to its excellent performance in temperature insensitive and sensing performance, the device is suitable for refractive index measurement in a complex environment. It might have broad application prospects in portable real-time monitoring equipment, for example, analyzing health status from the change of sweat composition, or detecting the content of microorganisms and other harmful substances in drinking water.
      原文链接:
    • NSTL

    Up-conversion luminescence performance of Tm3+/Yb3+ co-doped strontium cerate phosphors

    Seo Y.W.Park S.H.Jeong J.H.Choi B.C....
    5页
    查看更多>>摘要：© 2022Tm3+/Yb3+ co-doped Sr2CeO4 phosphors were fabricated via a high-energy ball milling technique. The structural, morphological, and luminescence characteristics were analyzed by XRD technique, field emission scanning electron microscopy, and up-conversion luminescence spectra, respectively. The structural X-ray diffraction patterns indicate their orthorhombic structure. Under excitation at 975 nm, the up-conversion luminescence spectra of Sr2CeO4:Tm3+/Yb3+ samples with various concentrations of Yb3+ were observed. The phosphor containing 10 mol% Yb3+ ions exhibited optimal up-conversion luminescence. All the samples show emission peaks at 478, 652, and 801 nm, which are assigned to the 1G4 → 3H6, 1G4 → 3F4, and 3H4 → 3H6 transitions of Tm3+. A detailed analysis of the up-conversion mechanisms is proposed based on simplified energy level diagram. The results show that the Sr2CeO4:Tm3+/Yb3+ phosphor has potential application prospects in wide-range and light emitting devices.
      原文链接:
    • NSTL

    Superhydrophobic-antibacterial polycarbonate fabrication using excimer laser treatment

    Sohrabi S.Ghafary B.Mollabashi M.Pazokian H....
    5页
    查看更多>>摘要：© 2022 Elsevier GmbHIn this paper, effect of the excimer laser irradiation on bacterial adhesion of the polycarbonate films was investigated. For this purpose, the surface roughness and wettability as two important factors are examined following laser treatment. The samples were irradiated by a KrF laser with the wavelength of 248 nanometers and pulse duration of about 25 ns. Scanning electron spectroscopy was used for investigating the changes in surface morphology. Finally, the results show that excimer laser irradiation with a proper irradiation parameters improve the antibacterial properties of polycarbonate surface.
      原文链接:
    • NSTL

    Application in optical design: Optimization for high intensity and aberration free camera lens system

    Gowda B N V.K.Gauni S.Maik V.Gurushankar K....
    5页
    查看更多>>摘要：© 2022The cost of a camera device has risen considerably in the last decade due to the optical lens element. Imaging system aberration is primarily caused by the different types of elements. The cost of an optical lens element is also related to the quality of the imaging system. The research proposes a unique optical design with reduced and optimized lens elements while maintaining high output quality. The research proposes the analysis and design of an optical imaging system with a reduced optical lens element. This paper looks at how sequential ray tracing algorithms use fine-tuned bespoke and commercial optical design and suggests more fine-tuning to improve imaging quality. Design stages also include automatic global synthesis, asphere expert, and glass expert, all of which must be correctly optimized to reduce error and improve performance. The proposed design is evaluated utilizing optical simulator analysis features such as the Modulation Transfer Function (MTF), Spot diagram and Quick ray aberration, and Error function to test its performance. The wavefront differential approach blends TOR (full form is needed) analysis for measuring the performance impact of manufacturing and assembly errors with diffraction MTF performance measurements. In both qualitative and quantitative terms, the proposed imaging system outperforms the existing imaging system.
      原文链接:
    • NSTL

    Controllable transmission of Airy pulses in nonlinear dissipative system

    Song L.Liu S.Liu X.Fang L....
    5页
    查看更多>>摘要：© 2022 Elsevier GmbHThe propagation characteristics of truncated Airy pulses have been numerically investigated in complex cubic-quintic Ginzburg-Landau equation and some interesting nonlinear phenomena are observed. The results show that the transmission trajectory and amplitude of the Airy pulses can be controlled by changing the gain dispersion. Due to the complex interaction between the side lobes, the double Airy pulses evolve into single soliton, double solitons and triple solitons, respectively. The interaction between linear loss and nonlinear gain has a significant effect on the propagation dynamics of Airy pulses, which can obtain stable bound state solitons or pulsating-like solitons. In addition, the period, structure and number of solitons can be controlled by properly choosing the parameters of the quintic nonlinear correction term.
      原文链接:
    • NSTL

    Interferometric accurate investigation of opto-thermo-mechanical features with help of artificial intelligence for antimicrobial polyamide-6 fibres grafted by quaternary ammonium salt with nano zinc oxide

    Seisa E.A.Abo-Lila G.M.Omar E.Z.Sokkar T.Z.N....
    5页
    查看更多>>摘要：© 2022 Elsevier GmbHThe Mach–Zehnder interferometer attached with multifunction mechanical stretching and rotation device is utilized for examining the opto-thermo-mechanical features of antimicrobial polyamide-6 fibres grafted by quaternary ammonium salt with nano zinc oxide (PA6-g-QAS/ZnO). A refined artificial intelligence strategy is suggested to perform an accurate investigation for the opto-thermo-mechanical properties of these antimicrobial fibrous materials. The changing in refractive indices and birefringence along the axis of PA6-g-QAS/ZnO fibre is examined. The morphology and the homogeneity of the tested fibre are investigated via the interferometric computed tomographic technique. To improve opto-mechanical features and antimicrobial activity of this fibre, the stretching and annealing processes are suggested. The impact of cold stretching on the optical and structural features of the PA6-g-QAS/ZnO fibres is examined. The antimicrobial activities of the PA6-g-QAS/ZnO fibres are calculated before and after the cold stretching process. Furthermore, the effect of annealing process on the refractive index, and birefringence along the axis of PA6-g-QAS/ZnO fibres and their antimicrobial activities is studied at various temperatures and durations to prefer the annealing conditions. The opto-mechanical properties of the annealed PA6-g-QAS/ZnO fibres at the most preferred annealing conditions is investigated. The obtained results give significant data for improving the opto-mechincal features and antimicrobial activity of antimicrobial materials.
      原文链接:
    • NSTL