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  • 1
    Online Resource
    Online Resource
    Adsorptive Removal of Iron Using SiO 2 Nanoparticles Extracted from Rice Husk Ash
    Hindawi Limited ; 2019
    In:  Journal of Analytical Methods in Chemistry Vol. 2019 ( 2019-06-02), p. 1-8
    Details
    In: Journal of Analytical Methods in Chemistry, Hindawi Limited, Vol. 2019 ( 2019-06-02), p. 1-8
    Abstract: In this work, SiO 2 nanoparticles were prepared by the sol-gel method after sodium silicate was extracted from rice husk ash (RHA) under various experimental conditions such as types of acids, NaOH concentration, dissolved time, and temperature and used for removal of Fe 2+ ions from aqueous solutions. The extracted SiO 2 was morphologically and chemically characterized and showed a surface area of 78 m 2 /g and uniform pores of 2.71 nm, offering high adsorption capacity for Fe 2+ ions. The influence of pH, contact time, and amount of adsorbent was studied in order to establish the best conditions for the Fe 2+ adsorption and removal. Furthermore, the adsorption data were fitted with an exponential shape curve for all the three variable parameters that affect the adsorption process. The best results were obtained for pH 5, 20 min contact time, and 0.5 g adsorbent dose. The loading adsorption capacity was 9 mg of Fe 2+ ions/g SiO 2 in the concentration range 0.1–1.0 mgL −1 . In addition, the synthesized SiO 2 with the size of around 50 nm can be used for specific heavy metal removal and drug delivery, after modification of the SiO 2 surface with various functional groups.
    Type of Medium: Online Resource
    ISSN: 2090-8865 , 2090-8873
    URL: Article
    DOI: 10.1155/2019/6210240
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2019
    detail.hit.zdb_id: 2654178-6
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  • 2
    Online Resource
    Online Resource
    An Innovatory Method Based on Continuation Power Flow to Analyze Power System Voltage Stability with Distributed Generation Penetration
    Hindawi Limited ; 2020
    In:  Complexity Vol. 2020 ( 2020-09-07), p. 1-15
    Details
    In: Complexity, Hindawi Limited, Vol. 2020 ( 2020-09-07), p. 1-15
    Abstract: With the penetration of distributed generation (DG) units, the power systems will face insecurity problems and voltage stability issues. This paper proposes an innovatory method by modifying the conventional continuation power flow (CCPF) method. The proposed method is realized on two prediction and correction steps to find successive load flow solutions according to a specific load scenario. Firstly, the tangent predictor is proposed to estimate the next predicted solution from two previous corrected solutions. And then, the corrector step is proposed to determine the next corrected solution on the exact solution. This corrected solution is constrained to lie in the hyperplane running through the predicted solution orthogonal to the line from the two previous corrected solutions. Besides, once the convergence criterion is reached, the procedure for cutting the step length control down to a smaller one is proposed to be implemented. The effectiveness of the proposed method is verified via numerical simulations on three standard test systems, namely, IEEE 14-bus, 57-bus, and 118-bus, and compared to the CCPF method.
    Type of Medium: Online Resource
    ISSN: 1076-2787 , 1099-0526
    URL: Article
    DOI: 10.1155/2020/8037837
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2020
    detail.hit.zdb_id: 2004607-8
    SSG: 11
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  • 3
    Online Resource
    Online Resource
    Network Reconfiguration and Distributed Generation Placement for Multi-Goal Function Based on Improved Moth Swarm Algorithm
    Hindawi Limited ; 2022
    In:  Mathematical Problems in Engineering Vol. 2022 ( 2022-4-11), p. 1-16
    Details
    In: Mathematical Problems in Engineering, Hindawi Limited, Vol. 2022 ( 2022-4-11), p. 1-16
    Abstract: This paper demonstrates an effective method of performing network reconfiguration (NR) and distributed generation placement (DGP) simultaneously called NR-DGP for the multi-goal function of reducing power loss and voltage deviation as well as enhancing load balance and feeder balance with the least number of changing switches. These membership goals are combined by the fuzzy decision-making relied on the max-min technique. The results for the NR and NR-DGP on two test system including of 33 and 84 nodes are gained by the improved moth swarm algorithm (IMSA). Wherein, IMSA is developed based on the original moth swarm algorithm (MSA) with improvement of the exploration mechanism using Lévy distribution. The calculated results show that NR-DGP method has gained the better improvement of the test systems’ technical indicators than the NR only. The obtained results also show that IMSA has better performance for the NR and NR-DGP problems than the MSA in term the quality of the obtained optimal solution. Thus, IMSA can be an effective approach for determining the optimal solution of the NR and NR-DGP problems.
    Type of Medium: Online Resource
    ISSN: 1563-5147 , 1024-123X
    URL: Article
    DOI: 10.1155/2022/5015771
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2014442-8
    SSG: 11
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  • 4
    Online Resource
    Online Resource
    Effects of Zinc Oxide Nanoparticles on the Properties of Pectin/Alginate Edible Films
    Hindawi Limited ; 2018
    In:  International Journal of Polymer Science Vol. 2018 ( 2018-10-22), p. 1-9
    Details
    In: International Journal of Polymer Science, Hindawi Limited, Vol. 2018 ( 2018-10-22), p. 1-9
    Abstract: This study aimed at developing the functional packaging properties of pectin/alginate films by adding zinc oxide nanoparticles (ZnO-NPs). The ZnO-NPs were added to the pectin/alginate film at the concentrations of 0.5, 2.5, 5, and 25 g/100 g of blended polymer. The effects of the ZnO-NP incorporation on the mechanical properties, hydration properties, oxygen permeability, ultraviolet transmission, transparency, and antimicrobial activity of the films were investigated. The addition of ZnO-NPs from 0 to 5 g/100 g of blended polymer to the pectin/alginate film increased 191.4% of the tensile strength, 169.8% of elongation at break, and antimicrobial properties (against Aspergillus niger , Colletotrichum gloeosporioides , Escherichia coli , and Saccharomyces cerevisiae ). In contrast, it reduced the solubility from 30.38% to 22.49%, water vapor permeability from 1.01 × 10 −14 to 0.414 × 10 −14  kg·m/m 2 ·Pa·s, moisture absorption, ultraviolet light transmission, and oxygen permeability from 270.86 × 10 −19 to 110.79 × 10 −19  kg·m/m 2 ·Pa·s. The effects are the highest when the concentration of the ZnO-NPs in the film was 5 g/100 g of blended polymer. Attenuated total reflectance-Fourier transform infrared analysis indicated that some interactions between the ZnO-NPs and pectin/alginate matrices were formed. These results suggest that pectin/alginate/ZnO-NPs films can be used as active packaging for food preservation.
    Type of Medium: Online Resource
    ISSN: 1687-9422 , 1687-9430
    URL: Article
    DOI: 10.1155/2018/5645797
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2018
    detail.hit.zdb_id: 2520688-6
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  • 5
    Online Resource
    Online Resource
    Immobilization of Protein A on Monodisperse Magnetic Nanoparticles for Biomedical Applications
    Hindawi Limited ; 2019
    In:  Journal of Nanomaterials Vol. 2019 ( 2019-03-24), p. 1-9
    Details
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2019 ( 2019-03-24), p. 1-9
    Abstract: We presented synthesis and physical characterization of iron oxide magnetic nanoparticles (Fe 3 O 4 ) for biomedical applications in the size range of 10-30 nm. Magnetic nanoparticles were synthesized by the coprecipitation method, and the particles’ size was controlled by two different injection methods of sodium hydroxide (NaOH). The synthesized magnetic nanoparticles were then modified by using series of linkers including tetraethyl orthosilicate (TEOS), 3-aminopropyltriethoxysilane (APTES), and glutaraldehyde (GA) to generate the structure of Fe 3 O 4 /SiO 2 /NH 2 /CHO, which can be used for immobilization of protein A. Additionally, we used transmission electron microscopy (TEM), X-ray powder diffraction (XRD), vibrating-sample magnetometry (VSM), and Fourier-transform infrared spectroscopy (FTIR), for characterization of properties and structure of the nanoparticles. An immobilization of protein A on magnetic nanoparticles was studied with a UV-Vis spectrum (UV-Vis) and fluorescence electron microscopy and Bradford method. Results showed that an XRD spectrum with a peak at (311) corresponded to the standard peak of magnetic nanoparticles. In addition, the magnetic nanoparticles with d ≥ 30  nm have higher saturation magnetizations in comparison with the smaller ones with d ≤ 10  nm. However, the smaller magnetic nanoparticles offered higher efficiency for binding of protein A, due to the high surface/volume ratio. These particles with functional groups on their surface are promising candidates for biomedical applications, e.g., drug delivery, controlled drug release, or disease diagnosis in point-of-care test.
    Type of Medium: Online Resource
    ISSN: 1687-4110 , 1687-4129
    URL: Article
    DOI: 10.1155/2019/2182471
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2019
    detail.hit.zdb_id: 2229480-6
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  • 6
    Online Resource
    Online Resource
    Finding Radial Network Configuration of Distribution System Based on Modified Symbiotic Organisms Search
    Hindawi Limited ; 2021
    In:  Complexity Vol. 2021 ( 2021-2-9), p. 1-23
    Details
    In: Complexity, Hindawi Limited, Vol. 2021 ( 2021-2-9), p. 1-23
    Abstract: Network reconfiguration (NR) is one of the most effective methods to reduce line power loss in the distribution system, which causes higher losses than the other parts of the power system. This paper proposes a modified symbiotic organisms search (MSOS) algorithm to solve the NR problem. For the purpose of enhancing the effectiveness of MSOS, the mutualism and parasitism strategies of the original symbiotic organisms search (SOS) have been modified to create better new solutions. In the mutualism strategy, the so-far best solution is updated immediately as soon as new solutions are created. In the parasitism strategy, the update is only implemented for the first half of control variables, whereas another half still remains unchanged. The comparison results between MSOS and SOS on twenty-five benchmark functions and different scales of test distribution systems with 14, 33, 69, and 119 nodes show that the improvement level of MSOS over SOS is significant with higher success rates and better quality of gained solutions. Similarly, MSOS also reaches better results than other methods in the literature. Consequently, MSOS can be a favorable method for determining the most appropriate configurations for the distribution systems.
    Type of Medium: Online Resource
    ISSN: 1099-0526 , 1076-2787
    URL: Article
    DOI: 10.1155/2021/7135318
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2004607-8
    SSG: 11
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