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  • 1
    Online Resource
    Online Resource
    Structural, Morphological, Optical, and Antibacterial Activities of Zinc Oxide Nanopowders: A Comparative Study of Green and Soft Chemical Synthesis
    Hindawi Limited ; 2022
    In:  Advances in Materials Science and Engineering Vol. 2022 ( 2022-9-6), p. 1-11
    Details
    In: Advances in Materials Science and Engineering, Hindawi Limited, Vol. 2022 ( 2022-9-6), p. 1-11
    Abstract: Zinc oxide, a well-known inorganic metal oxide in nanoparticle form, has outstanding antibacterial properties. In this work, the authors focus on determining ZnO nanoparticles’ structural, optical, and antibacterial activity. A simple soft chemical route synthesizes C-ZnO nanoparticles chemically, while the green synthesis method is used to prepare G-ZnO nanoparticles. Ocimum tenuiflorum leaf extract was used to prepare G-ZnO nanopowders. These samples are investigated and compared in terms of their structural, morphological, optical, and antibacterial properties. According to XRD investigations, the synthesized ZnO nanopowders possess a hexagonal structure. The particle size of G-ZnO is smaller than that of C-ZnO nanoparticles. The XPS result revealed the binding and interactions between molecules. The FTIR study confirmed the presence of molecules and their vibrations. UV-vis-DRS spectroscopy was used to investigate optical properties such as reflectance and band gap. The grain size of the G-ZnO nanopowders was decreased, and oxygen vacancy was produced. The antibacterial efficiency of plant extracts against two different bacterial strains, S. aureus (Gram-positive) and E.coli (Gram-negative), has been studied and reported.
    Type of Medium: Online Resource
    ISSN: 1687-8442 , 1687-8434
    URL: Article
    DOI: 10.1155/2022/7778328
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2501025-6
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  • 2
    Online Resource
    Online Resource
    Safety Assessment of Ubiquinol Acetate: Subchronic Toxicity and Genotoxicity Studies
    Hindawi Limited ; 2019
    In:  Journal of Toxicology Vol. 2019 ( 2019-04-01), p. 1-25
    Details
    In: Journal of Toxicology, Hindawi Limited, Vol. 2019 ( 2019-04-01), p. 1-25
    Abstract: Coenzyme Q10 (CoQ10) is a lipid soluble, endogenous antioxidant present at highest levels in the heart followed by the kidney and liver. The reduced CoQ10 ubiquinol is well known for its chemical instability and low bioavailability. The present study was designed to synthesize ubiquinol acetate, which is more stable and biologically active, and further evaluate its safety and genotoxic potential. Synthesized ubiquinol acetate showed better stability than that of ubiquinol at the end of 3 months. In vitro genotoxicity studies (AMES test, in vitro micronucleus and chromosomal aberration) showed ubiquinol acetate as nongenotoxic with no clastogenic or aneugenic effects at high dose of 5000 and 62.5 μ g/mL, respectively. In subchronic toxicity study, ubiquinol acetate was administered orally to Sprague Dawley rats at 150, 300, and 600 mg/kg/day for 90 days. No treatment related adverse effects were observed in males at 600 mg/kg/day; however, females showed treatment related increase in AST and ALT with small focal irregular white-yellow spots in liver on gross necropsy examination. Histopathological evaluation revealed hepatocellular necrosis in high dose females which was considered as adverse. Based on the results, the No-Observed-Adverse-Effect Level (NOAEL) of ubiquinol acetate in males and females was determined as 600 and 300 mg/kg/day, respectively.
    Type of Medium: Online Resource
    ISSN: 1687-8191 , 1687-8205
    URL: Article
    DOI: 10.1155/2019/3680757
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2019
    detail.hit.zdb_id: 2495098-1
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  • 3
    Online Resource
    Online Resource
    Sprayable reduced graphene oxide based high‐temperature solar absorber coatings for concentrated solar power applications
    Hindawi Limited ; 2021
    In:  International Journal of Energy Research Vol. 45, No. 15 ( 2021-12), p. 21487-21496
    Details
    In: International Journal of Energy Research, Hindawi Limited, Vol. 45, No. 15 ( 2021-12), p. 21487-21496
    Type of Medium: Online Resource
    ISSN: 0363-907X , 1099-114X
    URL: Issue
    URL: Article
    DOI: 10.1002/er.v45.15
    DOI: 10.1002/er.7196
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 1480879-1
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  • 4
    Online Resource
    Online Resource
    Application of Deep Learning to the Prediction of Solar Irradiance through Missing Data
    Hindawi Limited ; 2023
    In:  International Journal of Photoenergy Vol. 2023 ( 2023-9-22), p. 1-17
    Details
    In: International Journal of Photoenergy, Hindawi Limited, Vol. 2023 ( 2023-9-22), p. 1-17
    Abstract: The task of predicting solar irradiance is critical in the development of renewable energy sources. This research is aimed at predicting the photovoltaic plant’s irradiance or power and serving as a standard for grid stability. In practical situations, missing data can drastically diminish prediction precision. Meanwhile, it is tough to pick an appropriate imputation approach before modeling because of not knowing the distribution of datasets. Furthermore, not all datasets benefit equally from using the same imputation technique. This research suggests utilizing a recurrent neural network (RNN) equipped with an adaptive neural imputation module (ANIM) to estimate direct solar irradiance when some data is missing. Without imputed information, the typical projects’ imminent 4-hour irradiance depends on gaps in antique climatic and irradiation records. The projected model is evaluated on the widely available information by simulating missing data in each input series. The performance model is assessed alternative imputation techniques under a range of missing rates and input parameters. The outcomes prove that the suggested methods perform better than competing strategies when measured by various criteria. Moreover, combine the methodology with the attentive mechanism and invent that it excels in low-light conditions.
    Type of Medium: Online Resource
    ISSN: 1687-529X , 1110-662X
    URL: Article
    DOI: 10.1155/2023/4717110
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2023
    detail.hit.zdb_id: 2028941-8
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  • 5
    Online Resource
    Online Resource
    Application of Nontraditional Optimization Techniques for Airfoil Shape Optimization
    Hindawi Limited ; 2012
    In:  Modelling and Simulation in Engineering Vol. 2012 ( 2012), p. 1-6
    Details
    In: Modelling and Simulation in Engineering, Hindawi Limited, Vol. 2012 ( 2012), p. 1-6
    Abstract: The method of optimization algorithms is one of the most important parameters which will strongly influence the fidelity of the solution during an aerodynamic shape optimization problem. Nowadays, various optimization methods, such as genetic algorithm (GA), simulated annealing (SA), and particle swarm optimization (PSO), are more widely employed to solve the aerodynamic shape optimization problems. In addition to the optimization method, the geometry parameterization becomes an important factor to be considered during the aerodynamic shape optimization process. The objective of this work is to introduce the knowledge of describing general airfoil geometry using twelve parameters by representing its shape as a polynomial function and coupling this approach with flow solution and optimization algorithms. An aerodynamic shape optimization problem is formulated for NACA 0012 airfoil and solved using the methods of simulated annealing and genetic algorithm for 5.0 deg angle of attack. The results show that the simulated annealing optimization scheme is more effective in finding the optimum solution among the various possible solutions. It is also found that the SA shows more exploitation characteristics as compared to the GA which is considered to be more effective explorer.
    Type of Medium: Online Resource
    ISSN: 1687-5591 , 1687-5605
    URL: Article
    DOI: 10.1155/2012/636135
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2012
    detail.hit.zdb_id: 2401601-9
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  • 6
    Online Resource
    Online Resource
    Synthesis of Modified Phase-Changing Material with Latent Heat and Thermal Conductivity to Store Solar Energy Using a Carbon Nanotube
    Hindawi Limited ; 2022
    In:  International Journal of Photoenergy Vol. 2022 ( 2022-4-11), p. 1-12
    Details
    In: International Journal of Photoenergy, Hindawi Limited, Vol. 2022 ( 2022-4-11), p. 1-12
    Abstract: MicroPCMs’ excellent thermal capacity and photothermal translation features benefit solar energy storage applications significantly. A successful in situ polymerization procedure was employed to build microencapsulated phase-change materials using n-hexadecanol as the core and melamine-formaldehyde resin as the outer shell, and the thermal characteristics of the microPCMs were evaluated. In terms of micromorphology, the incorporation of hydroxylated carbon nanotubes into microPCMs with a compact shell has little effect on their spherical structure. MicroPCMs’ melting heat and latent heat are both 51.5°C with a 0.2 weight percent dose of hydroxylated carbon nanotubes, and n-energy hexadecanol’s storage efficiency is determined to be 75.25 percent. Thermal conductivity and photothermal conversion efficiency of microencapsulated phase-change materials engendered with increased hydroxylated carbon nanotube dosage have improved significantly, laying the foundation for improved photothermal storage efficiency. When 0.6 weight % hydroxylated carbon nanotubes are added to the mixture, microencapsulated phase-change materials have a thermal conduction of 0.3597 Wm−1·K−1 and 181.5 J·g−1. Additionally, all of the improved microPCMs show exceptional thermal stability across 500 heat cycles. Because of their large thermal capability and efficient photothermal conversion, the new microPCMs appear to be an appealing option for solar energy storage in direct-absorption solar collector systems.
    Type of Medium: Online Resource
    ISSN: 1687-529X , 1110-662X
    URL: Article
    DOI: 10.1155/2022/3412817
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2028941-8
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  • 7
    Online Resource
    Online Resource
    Performance Development and Evaluation of Solar Air Collector with Novel Phase Change Material
    Hindawi Limited ; 2022
    In:  International Journal of Photoenergy Vol. 2022 ( 2022-7-4), p. 1-12
    Details
    In: International Journal of Photoenergy, Hindawi Limited, Vol. 2022 ( 2022-7-4), p. 1-12
    Abstract: Experiments were carried out on an evacuated tube solar air collector connected to intrinsic thermal power storage to provide warm air unless solar radiation was available. As a phase change material, stearic acid was employed (PCM). Water has been used as a base fluid for converting sunlight into electricity gain to warm air, and the solar collector’s manifold was connected to the intrinsic thermal energy store. The most significant temperature variation between warm air and ecologic air was 38°C and 22°C, respectively, during direct and indirect solar radiation. A circular fin arrangement was used to achieve a flow rate of 0.020 kg s-1. The efficiency of minimum airflow rates (0.020 kg s-1) was 0.08–0.48 times that of maximum airflow rates (0.04 kg s-1). Because of the PCM’s better heat-storing capability, this system has a benefit over sensible storage systems in that it may be used after sunset.
    Type of Medium: Online Resource
    ISSN: 1687-529X , 1110-662X
    URL: Article
    DOI: 10.1155/2022/3787141
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2028941-8
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  • 8
    Online Resource
    Online Resource
    Comparative and Equilibrium Studies on Anionic and Cationic Dyes Removal by Nano-Alumina-Doped Catechol Formaldehyde Composite
    Hindawi Limited ; 2020
    In:  Journal of Chemistry Vol. 2020 ( 2020-09-26), p. 1-15
    Details
    In: Journal of Chemistry, Hindawi Limited, Vol. 2020 ( 2020-09-26), p. 1-15
    Abstract: Nano-alumina-doped catechol formaldehyde polymeric composite was prepared, characterized, and applied as an adsorbent for the removal of an anionic dye Congo red (CR) and a cationic dye SafraninO (SF), by adsorption process especially from aqueous solutions. Characterizations such as particle size distribution, zeta potential, BET, FTIR, and FESEM-EDAX were carried out for the adsorbent prepared. All experiments were conducted at the batch condition to study the effects of initial dye concentration (CR: 30–90 mg/L and SF: 10–50 mg/L), pH (2–11), temperature (25–55°C), and adsorbent dosage (0.05–0.3 g) on dye removal. The isotherm models (Langmuir, Freundlich, and Temkin) were analyzed for this adsorption work. The kinetic data obtained were analyzed by the pseudo-first-order, pseudo-second-order, Bangham, and Chien–Clayton equations. Dyes adsorption data were well fitted with the Freundlich isotherm equilibrium model and the pseudo-second-order kinetic model. Study results suggested that the nano-alumina-polymeric composite could be an effective adsorbent for anionic dye rather than cationic dye.
    Type of Medium: Online Resource
    ISSN: 2090-9063 , 2090-9071
    URL: Article
    DOI: 10.1155/2020/7617989
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2020
    detail.hit.zdb_id: 2393625-3
    detail.hit.zdb_id: 2703077-5
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  • 9
    Online Resource
    Online Resource
    Subcritical Water Technology for Enhanced Extraction of Biochemical Compounds from Chlorella vulgaris
    Hindawi Limited ; 2016
    In:  BioMed Research International Vol. 2016 ( 2016), p. 1-10
    Details
    In: BioMed Research International, Hindawi Limited, Vol. 2016 ( 2016), p. 1-10
    Abstract: Subcritical water extraction (SWE) technology has been used for the extraction of active compounds from different biomass materials with low process cost, mild operating conditions, short process times, and environmental sustainability. With the limited application of the technology to microalgal biomass, this work investigates parametrically the potential of subcritical water for high-yield extraction of biochemicals such as carbohydrates and proteins from microalgal biomass. The SWE process was optimized using central composite design (CCD) under varying process conditions of temperature (180–374°C), extraction time (1–20 min), biomass particulate size (38–250  μ m), and microalgal biomass loading (5–40 wt.%). Chlorella vulgaris used in this study shows high volatile matter (83.5 wt.%) and carbon content (47.11 wt.%), giving advantage as a feedstock for biofuel production. The results showed maximum total carbohydrate content and protein yields of 14.2 g/100 g and 31.2 g/100 g, respectively, achieved under the process conditions of 277°C, 5% of microalgal biomass loading, and 5 min extraction time. Statistical analysis revealed that, of all the parameters investigated, temperature is the most critical during SWE of microalgal biomass for protein and carbohydrate production.
    Type of Medium: Online Resource
    ISSN: 2314-6133 , 2314-6141
    URL: Article
    DOI: 10.1155/2016/5816974
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2016
    detail.hit.zdb_id: 2698540-8
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  • 10
    Online Resource
    Online Resource
    Particulate Size of Microalgal Biomass Affects Hydrolysate Properties and Bioethanol Concentration
    Hindawi Limited ; 2014
    In:  BioMed Research International Vol. 2014 ( 2014), p. 1-8
    Details
    In: BioMed Research International, Hindawi Limited, Vol. 2014 ( 2014), p. 1-8
    Abstract: Effective optimization of microalgae-to-bioethanol process systems hinges on an in-depth characterization of key process parameters relevant to the overall bioprocess engineering. One of the such important variables is the biomass particle size distribution and the effects on saccharification levels and bioethanol titres. This study examined the effects of three different microalgal biomass particle size ranges, 35  μ m ≤ x ≤ 90  μ m, 125  μ m ≤ x ≤ 180  μ m, and 295  μ m ≤ x ≤ 425  μ m, on the degree of enzymatic hydrolysis and bioethanol production. Two scenarios were investigated: single enzyme hydrolysis (cellulase) and double enzyme hydrolysis (cellulase and cellobiase). The glucose yield from biomass in the smallest particle size range (35  μ m ≤ x ≤ 90  μ m) was the highest, 134.73 mg glucose/g algae, while the yield from biomass in the larger particle size range (295  μ m ≤ x ≤ 425  μ m) was 75.45 mg glucose/g algae. A similar trend was observed for bioethanol yield, with the highest yield of 0.47 g EtOH/g glucose obtained from biomass in the smallest particle size range. The results have shown that the microalgal biomass particle size has a significant effect on enzymatic hydrolysis and bioethanol yield.
    Type of Medium: Online Resource
    ISSN: 2314-6133 , 2314-6141
    URL: Article
    DOI: 10.1155/2014/435631
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2014
    detail.hit.zdb_id: 2698540-8
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