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  • 1
    Online Resource
    Online Resource
    Design, Synthesis, and Biological Activity Evaluation of Novel AZT and Adenosine-Derived 1,2,3-Triazoles
    Hindawi Limited ; 2023
    In:  Journal of Chemistry Vol. 2023 ( 2023-9-28), p. 1-17
    Details
    In: Journal of Chemistry, Hindawi Limited, Vol. 2023 ( 2023-9-28), p. 1-17
    Abstract: CuSO4/hydrazine hydrate was used as a catalyst system for copper(I)-catalyzed alkyne-azide cycloaddition (CuAAC) of AZT and 5′-azido adenosine with terminal alkynes to give 30 novel 1,2,3-triazole derivatives. Screening for their anticancer, anti-inflammatory, angiotensin-converting enzyme 2 (ACE2), and 3C-like protease (3CLpro) inhibitory activities showed that several triazoles of AZT containing murayafoline A and indirubin-3′-oxime inhibited the growth of HepG2 and LU-1 with the IC50 values ranging from 11.01 to 19.87 μg/mL. Besides that, some triazole derivatives of adenosine exhibited anti-inflammatory activity against RAW264.7 cells with the IC50 values within an interval of 12.00–59.48.00 μg/mL. Especially, two triazoles of adenosine with indirubin-3′-oxime at O- and N1 positions expressed the ACE2 and 3CLpro inhibitory activities in which the triazole of adenosine with indirubin-3′-oxime at N1 inhibited both ACE2 and 3CLpro inhibitory activities with IC50 values of 135.62 and 142.95 μg/mL, respectively.
    Type of Medium: Online Resource
    ISSN: 2090-9071 , 2090-9063
    URL: Article
    DOI: 10.1155/2023/1605316
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2023
    detail.hit.zdb_id: 2393625-3
    detail.hit.zdb_id: 2703077-5
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  • 2
    Online Resource
    Online Resource
    Quantum Beat of Excitons in the Prolate Ellipsoidal Quantum Dots
    Hindawi Limited ; 2022
    In:  Journal of Nanomaterials Vol. 2022 ( 2022-8-1), p. 1-14
    Details
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2022 ( 2022-8-1), p. 1-14
    Abstract: In this paper, renormalized wavefunction method was applied to study quantum beats of excitons in the InGaAs/InAlAs prolate ellipsoidal quantum dots (QDs). The obtained results show that, without the pump laser, the exciton absorption intensity is just a smooth curve. In contrast, when the system is illuminated by a strong pump laser resonating with two exciton levels, the oscillation behavior of exciton absorption intensity, which is known as quantum beats of excitons, is observed. That result can be interpreted as an indirect consequence of the Pauli exclusion principle leading to a splitting of the electron levels, which forms two close exciton levels, and if two excitons are excited coherently, the interference of these two excitons will finally form a quantum beat. The study also shows that the geometry shape of the QDs has strong influence on the properties of quantum beats. Changing the period of quantum beats in particular or optical properties in general in QDs thus becomes more flexible through changing their geometry shapes. This is one interested advantage of the ellipsoidal QDs and is expected to increase their applicability more than the spherical QDs.
    Type of Medium: Online Resource
    ISSN: 1687-4129 , 1687-4110
    URL: Article
    DOI: 10.1155/2022/6979280
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2229480-6
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  • 3
    Online Resource
    Online Resource
    The Study’s Chemical Interaction of the Sodium Silicate Solution with Extender Pigments to Investigate High Heat Resistance Silicate Coating
    Hindawi Limited ; 2021
    In:  Journal of Analytical Methods in Chemistry Vol. 2021 ( 2021-4-5), p. 1-11
    Details
    In: Journal of Analytical Methods in Chemistry, Hindawi Limited, Vol. 2021 ( 2021-4-5), p. 1-11
    Abstract: Silicate coating is water-based paint with many advantages and wide applications in many different industries. However, there are still some problems with silicate coating: how to increase its resistance to heat at high temperatures and prolong the life of the coating. Silicate paints have high durability and longevity dependent mainly on the chemical interaction of the silicate binder with extender pigments. Therefore, our groups have studied the geopolymerization process of the sodium silicate solution with extender pigments to investigate high heat resistance silicate coating. The effect of curing time on the chemical interaction between sodium silicate solution and extender pigments (ZnO, TiO2, Fe2O3, CaCO3, and Na2SiF6) was investigated by Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis (TGA), and X-ray diffraction (XRD). The shift of antisymmetric stretching vibration of the Si-O-Si bond (1060 cm−1) to low frequency and increase of the intensity of the Si-O-Si stretching as curing time increases from 1 to 20 days are due to the increased chemical interaction between extender pigments (ZnO, TiO2, Fe2O3, CaCO3, and Na2SiF6) and sodium silicate solution. Moreover, TG results of ZnO-silicate, TiO2-silicate, CaCO3-silicate, Na2SiF6-silicate, and Fe2O3-silicate coating at 1 and 20 days of curing show high residual geopolymer about 69–90% at 800°C. Thus, we proposed that the geopolymerization process between sodium silicate solution and extender pigments (ZnO, TiO2, Fe2O3, CaCO3, and Na2SiF6) increases when the curing time from 1 to 20 days leads to forming geopolymer silicate with high thermal stability. In addition, the optimal mixing ratio between sodium silicate solution and extender pigments (ZnO, TiO2, Fe2O3, CaCO3, and Na2SiF6) is as follows: 25% binder (sodium silicate solution), 8% ZnO; 5% TiO2, 5% Fe2O3, 1% Na2SiF6, 21% CaCO3, 34% H2O, and 1% additives to make high heat resistance silicate coating with temperature resistance at 1000°C.
    Type of Medium: Online Resource
    ISSN: 2090-8873 , 2090-8865
    URL: Article
    DOI: 10.1155/2021/5510193
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2654178-6
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  • 4
    Online Resource
    Online Resource
    A Novel Wideband Circularly Polarized Antenna for RF Energy Harvesting in Wireless Sensor Nodes
    Hindawi Limited ; 2018
    In:  International Journal of Antennas and Propagation Vol. 2018 ( 2018), p. 1-9
    Details
    In: International Journal of Antennas and Propagation, Hindawi Limited, Vol. 2018 ( 2018), p. 1-9
    Abstract: A novel wideband circularly polarized antenna array using sequential rotation feeding network is presented in this paper. The proposed antenna array has a relative bandwidth of 38.7% at frequencies from 5.05 GHz to 7.45 GHz with a highest gain of 12 dBi at 6 GHz. A corresponding left-handed metamaterial is designed in order to increase antenna gain without significantly affecting its polarization characteristics. The wideband circularly polarized antenna with 2.4 GHz of bandwidth is a promising solution for wireless communication system such as tracking or wireless energy harvesting from Wi-Fi signal based on IEEE 802.11ac standard or future 5G cellular. A potential application of this antenna as a receiving antenna for RF-DC device to obtain DC power for a wireless sensor node from Wi-Fi signal is shown.
    Type of Medium: Online Resource
    ISSN: 1687-5869 , 1687-5877
    URL: Article
    DOI: 10.1155/2018/1692018
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2018
    detail.hit.zdb_id: 2397585-4
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  • 5
    Online Resource
    Online Resource
    The Resistive Switching Behavior of Al/Chitosan-Graphene Oxide/FTO Structure
    Hindawi Limited ; 2021
    In:  Journal of Nanomaterials Vol. 2021 ( 2021-4-6), p. 1-7
    Details
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2021 ( 2021-4-6), p. 1-7
    Abstract: Resistive random access memory (RRAM) is emerging as a new class of nonvolatile memory that offers promising electronic properties and simple metal-insulator-metal (MIM) structures for sandwich layers, such as organics, inorganics, and hybrid materials. Hybrid structures have attracted much interest recently because of their advantageous properties. The combination of chitosan (CS) and graphene oxide (GO) acts as switching layers in the Al/CS-GO/FTO RRAM structure it is studied with bipolar switching behavior at approximately 102 ON/OFF ratios during 100 cycles. This hybrid interaction is identified by shifts in the D, G, and 2D bands using Raman spectroscopy. The conduction mechanism is proposed to be a space-charge-limited conduction (SCLC) mechanism and trap-assisted tunneling conduction mechanism in the ON and OFF states, respectively. The trapped and detrapped electrons move through the trap sites with external electric fields, and this movement is responsible for the switching mechanism of the CS-GO nanocomposite memory device.
    Type of Medium: Online Resource
    ISSN: 1687-4129 , 1687-4110
    URL: Article
    DOI: 10.1155/2021/5565169
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2229480-6
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  • 6
    Online Resource
    Online Resource
    Monodisperse Uniform CeO 2 Nanoparticles: Controlled Synthesis and Photocatalytic Property
    Hindawi Limited ; 2016
    In:  Journal of Nanomaterials Vol. 2016 ( 2016), p. 1-7
    Details
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2016 ( 2016), p. 1-7
    Abstract: Ceria nanostructure-based catalysts have attracted much attention in recent years because of their unique physiochemical properties. Herein, we have presented a simple two-phase approach for the synthesis of ceria nanocrystals. Structural and morphological characterization by XRD and TEM showed that the as-synthesized monodisperse CeO 2 nanoparticles (NPs) had cubic fluorite crystal structure with average particle size about 6.75 nm. The effects of hydrothermal temperature, annealing time, and concentration of cerium nitrate on the nanostructures of the products were also investigated and discussed. In addition, the CeO 2 nanocrystals proved to be an effective catalyst for the photodegradation of blue methylene under UV illumination.
    Type of Medium: Online Resource
    ISSN: 1687-4110 , 1687-4129
    URL: Article
    DOI: 10.1155/2016/8682747
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2016
    detail.hit.zdb_id: 2229480-6
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  • 7
    Online Resource
    Online Resource
    Novel Integrated Nanofertilizers for Improving the Growth of Polyscias fruticosa and Asparagus officinalis
    Hindawi Limited ; 2022
    In:  Journal of Nanomaterials Vol. 2022 ( 2022-4-28), p. 1-10
    Details
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2022 ( 2022-4-28), p. 1-10
    Abstract: The study of nanotechnology has been focused in recent years on the application in various fields including agriculture. Nanofertilizers were suggested to have the ability to supply plants with nutrients more effectively and thus significantly improve crop productivity. Previous studies reported the fabrication of nanofertilizers that contained only one or two essential elements. The addition of other nutrients is necessary for promoting plant development. Therefore, in this study, a novel integrated nanofertilizer containing both macro- and micronutritional elements was synthesized and characterized. The results showed that the prepared fertilizer had the rod shape and nanosize of 20-30 nm in width and 80 nm in length. Treatment of Polyscias fruticosa and Asparagus officinalis crops with the integrated nanofertilizer increased the number of branches, leaf area, dry matter production, and total biomass up to 50% at using level of 5% compared to nontreatment groups.
    Type of Medium: Online Resource
    ISSN: 1687-4129 , 1687-4110
    URL: Article
    DOI: 10.1155/2022/5791922
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2229480-6
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