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Wissenschaftliche Verlagsgesellschaft
Optik

Wissenschaftliche Verlagsgesellschaft

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    Structural, elastic and mechanical analysis of samarium doped zinc-borosilicate glass

    Cheong W.M.Zaid M.H.M.Matori K.A.Fen Y.W....
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHSamarium (III) oxide doped zinc-borosilicate glasses were successfully fabricated using the melt-quenching method by using SLS glass as a source of SiO2. With the progression of Sm3+ concentration, the density of the sample improved from 3.423 g/cm3 to 3.495 g/cm3, while the molar volume raised from 21.760 cm3/mol to 23.665 cm3/mol. The XRD analysis verified the samples’ amorphous nature. Besides, the longitudinal and shear velocity range between 5265.15 and 5706.244 m/s and 2900.247–3039.522 m/s, respectively. The elastic moduli for longitudinal, shear, bulk, and Young's modulus range between 96.389–111.457 GPa, 29.247–31.624 GPa, 56.493–69.292 GPa, and 75.000–82.345, respectively. Furthermore, with the increment of Sm3+ concentration, the sample's Poisson's ratio reduces from 0.302 to 0.270, indicating a progressive rise in cross-link density due to increased glass ionicity. Moreover, the fractal bond connectivity and fugacity rise from 1.826 to 2.170 and 0.060 to 0.083, respectively, with the progression of Sm3+ concentration. The findings imply that the Sm3+ dopant acts as a glass modifier, impacting the elastic performance of the zinc-borosilicate glasses.
      原文链接:
    • NSTL
    • Elsevier

    Structural, optical and photo-induced catalytic properties of derived-Leucoxene /BiVO4 composite prepared by sonochemical process

    Kansaard T.Pecharapa W.Ishihara K.N.
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHIn this work, the Leucoxene /BiVO4 composite material was prepared by sonochemical-assisted process by using low-cost leucoxene derived material (LDM) as titanium dioxide source and BiVO4 with different composition ratios. Crystallinity of composite specimens show the combining structure between monoclinic BiVO4 and TiO2 rutile phase with corresponding optical band gap of 2.4 eV and 2.85 eV, respectively. The 2:8-LDM:BV composite performed superior photocatalytic activity with complete decomposition of RhB dye under 20 min of light exposure due to heterojunction structure assisting the recombination retardment of photogenerated electron-hole pair. Superoxide radical (?O2-) is revealed to be major active specie induced by this composite. The composite catalyst exhibits excellent repeatability and reusability with 80% decomposition of organic compound after 10 times of usage.
      原文链接:
    • NSTL
    • Elsevier

    An efficient fuzzy-logic based MPPT controller for grid-connected PV systems by farmland fertility optimization algorithm

    Hai T.Zhou J.Muranaka K.
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHSolar energy has largely been penetrated into electric power systems due to its numerous merits such as zero emissions while having no noise. In this regard, the operation of such systems would not be a straightforward task as obtaining the maximum power point (MPP) in the presence of modules mismatching and partial shading (PS) problems would be very challenging. Accordingly, MPP tracking (MPPT) techniques have been introduced to address the problem while these techniques themselves also may have some issues to investigate, such as the tracking speed and conciseness. There have been numerous methods developed thus far for the MPPT applications in solar photovoltaic (PV) panels. In between, prevalent approaches are considered quick and straightforward algorithms, but they present rational performance with stable climatic conditions. Furthermore, usually, these methods are trapped into local maxima and global maxima would be overlooked. Hence, a combinatorial MPPT algorithm is proposed in this paper based on the fuzzy logic controller (FLC) and improved farmland fertility optimization (IFFO) method to optimally tune the parameters of the controller. This method would bring excellent performance to the system in the case of uniform irradiance (UI) and PS. The performance of the presented approach has been validated by making a comprehensive comparison with six other methods while it leads to the highest efficiencies of 99 % for UI, PS1, and PS2. It is also noteworthy the solar system is operated together with a battery energy storage (BES) system to effectively address the solar power generation deficit during the day.
      原文链接:
    • NSTL
    • Elsevier

    Concurrent topology and fiber orientation optimization of CFRP structures in space-borne optical remote sensor

    Huang B.Li Z.H.Tian X.Z.Yang L....
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHLightweight design is one of the most important concepts in the design of space-borne optical remote sensors. Carbon fiber reinforced polymer (CFRP), as one material with high ratio of modulus to density, is widely employed to realize the lightweight design. To maximize the stiffness and strength of CFRP with prescribed mass, fiber orientation and topology optimization are accomplished and optimum design result is acquired in this paper. First, the optimization algorithm of fiber orientation is put forward to find the optimal fiber direction and verified by theoretical analysis and simulations, illustrating that [90°/+ 45°/? 45°/0°] fiber orientation and symmetrical laminas are indispensable. Furthermore, the topology optimization algorithm including the density interpolation method and sensitivity analysis method is brought about to find the optimal material distribution. The algorithm is validated to be convergent and can provide a conceptual model which offers a reference for the critical design. Finally, acquired in the mechanical test is the performance of the optical remote sensor whose first three characteristic frequencies are respectively 66.95 Hz, 70.37 Hz, and 98.84 Hz. The mechanical amplification factor is 5.29, which meet the performance requirement of the stiffness and strength for the optical remote sensor.
      原文链接:
    • NSTL
    • Elsevier

    An ultraviolet to near-infrared photosensor based on microstructured CuO

    Michel C.R.Camarena-Corona E.Martinez-Preciado A.H.
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHCopper (II) oxide was obtained at 400 °C by the coprecipitation method. The morphology corresponds to a porous network of interconnected submicron particles. The bandgap energy (Eg) of this material was ~1.44 eV. The photocurrent experiments show a decreased from 54 μA to 27 μA, when the radiation was changed from UV-A (365 nm) to near-infrared (850 nm), indicating the key role of the photon energy. When different values of optical irradiance were used, from 60 to 100 mW/cm2, the results revealed a reliable quantitative detection of light. From I - V curves, an ohmic behavior was observed, regardless of the wavelength used. The best values of photoresponsivity, quantum efficiency and specific detectivity were obtained in UV light. Field experiments revealed a high sensitivity to variations in the intensity of sunlight, which suggests its application in photocells. This study shows that CuO can be used in broad-spectrum optoelectronic sensors.
      原文链接:
    • NSTL
    • Elsevier

    Fundamentals of organic solar cells: A review on mobility issues and measurement methods

    Ghorab M.Fattah A.Joodaki M.
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHIn the past few years, there have been impressive breakthroughs to enhance the structure of organic solar cells (OSCs) in order to improve the performance. Resulting in increment of the power conversion efficiency (PCE) from 5% to 18% in OSCs and up to 25% in OSCs module. The Developments cause these thin and flexible, eco-friendly, and low-cost photovoltaic devices to be promising technology for wide range of applications such as internet of things (IOT), sensors, architecture, and wearable electronics.In the past few years, there have been impressive breakthroughs to enhance the structure of organic solar cells (OSCs) in order to improve the performance. Resulting in increment of the power conversion efficiency (PCE) from 5% to 18% in OSCs and up to 25% in OSCs module. The Developments cause these thin and flexible, eco-friendly, and low-cost photovoltaic devices to be promising technology for wide range of applications such as internet of things (IOT), sensors, architecture, and wearable electronics. Further, in this article, fundamental characteristics, operation principles, charge carriers transport mechanisms, and electrical model parameters of an OSC is reviewed. Considering polymers as main and most common building blocks of an OSC, charge transport and current models also have been studied. In addition, mobility characteristics, as one of the critical parameters affecting the OSC performance has investigated. Time of flight (TOF), space charge limited current (SCLC), charge extraction by linearly extracting voltage (CELIV), and impedance spectroscopy as the four fundamental methods to measure mobility in OSCs along with discussion about the advantages and drawbacks of each technique have been studied.
      原文链接:
    • NSTL
    • Elsevier

    Optical modeling for geometric phase for the Hasimoto transformations on unit sphere

    Korpinar T.Korpinar Z.Ugur Kaymanli G.
    5页
    查看更多>>摘要：? 2022In this paper, the key issue we address here is the Hasimoto transformation in three-dimensional Euclidean space, which allows us to specify the magnetic trajectory for the spherical curve in R3. We, then show the motion of the spherical curve is equal to the nonlinear heat system. Lastly, we solve this nonlinear heat system numerically and then give a physical application of it.
      原文链接:
    • NSTL
    • Elsevier

    Tuneable luminescence of Pr3+-doped sodium aluminium gadolinium phosphate glasses for photonics applications

    Wantana N.Chanthima N.Kaewkhao J.Kaewnuam E....
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHPr3+ doped sodium aluminium gadolinium phosphate (Pr:NaAlGdP) glasses were prepared to characterize on the structure, physical and especially spectroscopic properties. From XRD and FTIR results, synthesized glasses had the amorphous nature with phosphate complexes as the main structure units. The density, molar volume and refractive index of glass increased with increment of Pr2O3 concentration. The absorption spectra demonstrated the strong absorbance of Pr3+ dopant in visible light and near infrared region. The emission spectra recorded under 444, 468 and 481 nm excitation exhibited overlapping of Pr3+ emission from two emitting levels, 1D2 and 3P0. The 1D2→3H4 transition was of the highest intensity with emission maxima at 600 nm. The distinct excitation wavelengths caused the different emission patterns, resulting to the tuneable color of emission as pink, orange, and reddish orange. The optimum concentration of Pr2O3 in NaAlGdP glass is 0.1 mol% with the highest photoluminescence intensity and the 2nd longest decay time in hundred microsecond order. The non-single exponential decay profile and the reduction of decay time with added Pr2O3 content indicated the resonant energy transfer between Pr3+ ions. The high values of stimulated emission cross-section, branching ratio and quantum efficiency from Judd-Ofelt analysis confirmed the potential lasing action and light emitting with 600 nm from this glass. The radioluminescence study also represented the interesting ability of glass for X-ray detection. The Pr:NaAlGdP glass is a promising new photonics material for the tuneable light source, LED, display / screen, waveguide and laser medium.
      原文链接:
    • NSTL
    • Elsevier

    Conservation laws for dispersive optical solitons with Radhakrishnan–Kundu–Lakshmanan model having quadrupled power-law of self-phase modulation

    Biswas A.Kara A.H.Yildirim Y.Alshehri A.M....
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHThis paper obtains conservation laws for the newest version of Radhakrishnan–Kundu–Lakshmanan model that comes with quadrupled form of nonlinearity. The multiplier approach makes this retrieval possible. The conserved quantities are derived from the bright 1-soliton that has been recently reported. The results are in terms of special functions.
      原文链接:
    • NSTL
    • Elsevier

    Sr-substitution-guided Eu2+ site engineering of Ca9Nd(PO4)7:Eu2+ for high-efficiency white light-emitting diodes

    Zhao J.Zhou J.Wang L.Dong J....
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHThe phosphor-converted white light-emitting diodes (pc-WLEDs) have been regarded as a promising alternative to the traditional light source in the fields of lighting and display. Herein, Ca9?xSrxNd(PO4)7: Eu2+ phosphor with moderately broadband ed emission was successfully designed and synthesized based on Ca9Nd(PO4)7. The X-ray diffraction (XRD) patterns ensure the phase purity of the materials. Further XRD Rietveld refinements were performed to shed light on the Sr/Ca substitution impact and the site occupations induced by intentionally introduced Sr. The site strategy was proved to be feasible along with the Sr/Ca3 and sequentially Eu/Sr preferable occupations, which leads to confined regulation of the Eu luminescent in the host. Theoretical simulations based on density functional theory (DFT) suggest a good potential of the materials as hosting matrices of Eu2+ before and after Sr/Ca substitution, while the site preference was proved from the theoretical aspect as well. At last, the materials were coated onto a near-ultraviolet (n-UV) commercial LED chip to fabricate a pc-WLED with warm white-light emission and high color rendering index (Ra). The prototype pc-WLED also survived a long-term stability test and current-dependent test to show great potential in practical application.
      原文链接:
    • NSTL
    • Elsevier