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  • 1
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    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
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    Waste Management System Using IoT-Based Machine Learning in University
    Hindawi Limited ; 2020
    In:  Wireless Communications and Mobile Computing Vol. 2020 ( 2020-02-27), p. 1-13
    Details
    In: Wireless Communications and Mobile Computing, Hindawi Limited, Vol. 2020 ( 2020-02-27), p. 1-13
    Abstract: Along with the development of the Internet of Things (IoT), waste management has appeared as a serious issue. Waste management is a daily task in urban areas, which requires a large amount of labour resources and affects natural, budgetary, efficiency, and social aspects. Many approaches have been proposed to optimize waste management, such as using the nearest neighbour search, colony optimization, genetic algorithm, and particle swarm optimization methods. However, the results are still too vague and cannot be applied in real systems, such as in universities or cities. Recently, there has been a trend of combining optimal waste management strategies with low-cost IoT architectures. In this paper, we propose a novel method that vigorously and efficiently achieves waste management by predicting the probability of the waste level in trash bins. By using machine learning and graph theory, the system can optimize the collection of waste with the shortest path. This article presents an investigation case implemented at the real campus of Ton Duc Thang University (Vietnam) to evaluate the performance and practicability of the system’s implementation. We examine data transfer on the LoRa module and demonstrate the advantages of the proposed system, which is implemented through a simple circuit designed with low cost, ease of use, and replace ability. Our system saves time by finding the best route in the management of waste collection.
    Type of Medium: Online Resource
    ISSN: 1530-8669 , 1530-8677
    URL: Article
    DOI: 10.1155/2020/6138637
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2020
    detail.hit.zdb_id: 2045240-8
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  • 3
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    Genome-Wide Analysis of Genes Encoding Methionine-Rich Proteins in Arabidopsis and Soybean Suggesting Their Roles in the Adaptation of Plants to Abiotic Stress
    Hindawi Limited ; 2016
    In:  International Journal of Genomics Vol. 2016 ( 2016), p. 1-8
    Details
    In: International Journal of Genomics, Hindawi Limited, Vol. 2016 ( 2016), p. 1-8
    Abstract: Oxidation and reduction of methionine (Met) play important roles in scavenging reactive oxygen species (ROS) and signaling in living organisms. To understand the impacts of Met oxidation and reduction in plants during stress, we surveyed the genomes of Arabidopsis and soybean ( Glycine max L.) for genes encoding Met-rich proteins (MRPs). We found 121 and 213 genes encoding MRPs in Arabidopsis and soybean, respectively. Gene annotation indicated that those with known function are involved in vital cellular processes such as transcriptional control, calcium signaling, protein modification, and metal transport. Next, we analyzed the transcript levels of MRP-coding genes under normal and stress conditions. We found that 57 AtMRPs were responsive either to drought or to high salinity stress in Arabidopsis ; 35 GmMRPs were responsive to drought in the leaf of late vegetative or early reproductive stages of soybean. Among the MRP genes with a known function, the majority of the abiotic stress-responsive genes are involved in transcription control and calcium signaling. Finally, Arabidopsis plant which overexpressed an MRP-coding gene, whose transcripts were downregulated by abiotic stress, was more sensitive to paraquat than the control. Taken together, our report indicates that MRPs participate in various vital processes of plants under normal and stress conditions.
    Type of Medium: Online Resource
    ISSN: 2314-436X , 2314-4378
    URL: Article
    DOI: 10.1155/2016/5427062
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2016
    detail.hit.zdb_id: 2711883-6
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  • 4
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    Multiresidue Pesticides Analysis of Vegetables in Vietnam by Ultrahigh-Performance Liquid Chromatography in Combination with High-Resolution Mass Spectrometry (UPLC-Orbitrap MS)
    Hindawi Limited ; 2019
    In:  Journal of Analytical Methods in Chemistry Vol. 2019 ( 2019-05-08), p. 1-12
    Details
    In: Journal of Analytical Methods in Chemistry, Hindawi Limited, Vol. 2019 ( 2019-05-08), p. 1-12
    Abstract: An ultrahigh-performance liquid chromatography in combination with high-resolution mass spectrometry Thermo Q-Extractive Focus Orbitrap MS has been introduced for analysis of multiclass pesticides in vegetable samples collected in Hanoi, Vietnam. Multiclass pesticides were separated on the Thermo Hypersil Gold PFP column utilizing a gradient of the mobile phase consisting of 5 mM ammonium formate, 0.1% formic acid in deionized water, and methanol. The target analytes were detected in the full-scan mode on Thermo Scientific Q-Exactive Focus Orbitrap MS for quantitation at the optimum operating conditions. These conditions included, but not limit to, the resolution of 70000 at the full width at half maximum in both positive and negative mode, mass range from 80 to 1000  m/z , and optimized parameters for the heated electrospray ionization source. The identification of the analytes in real samples was based on retention times, mass to charge ratios, mass accuracies, and MS/MS spectra at the confirmation mode with the inclusion list of target analytes. The mass accuracies of target analytes were from −4.14 ppm (dinotefuran) to 1.42 ppm (cinosulfuron) in the neat solvent and from −3.91 ppm (spinosad D) to 1.29 ppm (cinosulfuron) in the matrix-matched solution. Target analytes in the vegetable-based matrix were extracted by the QuEChERS method. Some critical parameters of the analytical method such as linearity, repeatability, limit of detection, and limit of quantitation have been evaluated and implemented. Excellent LOD and LOQ of the developed method were achieved at the range of 0.04–0.85 and 0.13–2.9  μ g·kg −1 , respectively. Intraday and interday repeatability of the analytical signal (peak area, n = 6 ) of the developed method were below 3% and 10%, correspondingly. The matrix effect, extraction recovery, and overall recovery were fully investigated by spiking experiments. Experimental results demonstrated that the ionization suppression or enhancement was the main contribution on the overall recoveries of target analytes. Finally, the in-house validated method was applied to pesticides screening in vegetables samples in local villages in Hanoi, Vietnam. The concentrations of all target analytes were below limit of quantitation and lower than US-FDA or EU maximum residue levels.
    Type of Medium: Online Resource
    ISSN: 2090-8865 , 2090-8873
    URL: Article
    DOI: 10.1155/2019/3489634
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2019
    detail.hit.zdb_id: 2654178-6
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  • 5
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    Separation of Spherical Nanosilica from Agricultural Wastes in Vietnam via Ultrasonic-Assisted Precipitation and Application for Effective Removal of Methylene Blue from Aqueous Solution
    Hindawi Limited ; 2023
    In:  Journal of Nanotechnology Vol. 2023 ( 2023-9-26), p. 1-16
    Details
    In: Journal of Nanotechnology, Hindawi Limited, Vol. 2023 ( 2023-9-26), p. 1-16
    Abstract: Agricultural wastes including bagasse and rice husk ashes are employed for synthesizing spherical nanosilica materials via the ultrasonic-assisted precipitation process in the present study. The comparison between them and nanosilica prepared from pure sodium silicate is also carried out. The role of the NH4OH : ethanol volume ratio is demonstrated. The obtained nanosilica is characterized by modern methods including X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), infrared spectroscopy (IR), scanning electron microscopy (SEM), and nitrogen adsorption/desorption isotherms (BET). The nanosilica material is employed as an effective adsorbent for the removal of methylene blue (MB) from an aqueous solution. The suitable pH and adsorbent dosage are determined at 8 and 0.375 g·L−1. The adsorption isotherm study is surveyed based on Langmuir and Freundlich isotherm models. Pseudo-second-order kinetic model and Weber–Morris intraparticle diffusion model well describe the chemical nature of the adsorption. The thermodynamic parameters of the reaction are determined based on the Van’t Hoff equation.
    Type of Medium: Online Resource
    ISSN: 1687-9511 , 1687-9503
    URL: Article
    DOI: 10.1155/2023/8884113
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2023
    detail.hit.zdb_id: 2523901-6
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  • 6
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    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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  • 7
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    High-Order Iterative Scheme for a Viscoelastic Wave Equation and Numerical Results
    Hindawi Limited ; 2021
    In:  Mathematical Problems in Engineering Vol. 2021 ( 2021-6-5), p. 1-27
    Details
    In: Mathematical Problems in Engineering, Hindawi Limited, Vol. 2021 ( 2021-6-5), p. 1-27
    Abstract: In this paper, we consider a Robin problem for a viscoelastic wave equation. First, by the high-order iterative method coupled with the Galerkin method, the existence of a recurrent sequence via an N -order iterative scheme is established, and then the N -order convergent rate of the obtained sequence to the unique weak solution of the proposed model is also proved. Next, with N = 2 , a numerical algorithm given by the finite-difference method is constructed to approximate the solution via the 2-order iterative scheme. Moreover, the same algorithm for the single-iterative scheme generated by the 2-order iterative scheme is also considered. Finally, comparison with errors of the numerical solutions obtained by the single-iterative scheme and the 2-order iterative scheme shows that the convergent rate of the 2-order iterative scheme is faster than that of the single-iterative scheme.
    Type of Medium: Online Resource
    ISSN: 1563-5147 , 1024-123X
    URL: Article
    DOI: 10.1155/2021/9917271
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2014442-8
    SSG: 11
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  • 8
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    Designing Efficient Smart Home Management with IoT Smart Lighting: A Case Study
    Hindawi Limited ; 2020
    In:  Wireless Communications and Mobile Computing Vol. 2020 ( 2020-11-20), p. 1-18
    Details
    In: Wireless Communications and Mobile Computing, Hindawi Limited, Vol. 2020 ( 2020-11-20), p. 1-18
    Abstract: Smart homes are an element of developing smart cities. In recent years, countries around the world have spared no effort in promoting smart cities. Smart homes are an interesting technological advancement that can make people’s lives much more convenient. The development of smart homes involves multiple technological aspects, which include big data, mobile networks, cloud computing, Internet of Things, and even artificial intelligence. Digital information is the main component of signal control and flow in a smart home, while information security is another important aspect. In the event of equipment failure, the task of safeguarding the system’s information is of the utmost importance. Since smart homes are automatically controlled, the problem of mobile network security must be taken seriously. To address these issues, this paper focuses on information security, big data, mobile networks, cloud computing, and the Internet of Things. Security efficiency can be enhanced by using a Secure Hash Algorithm 256 (SHA-256), which is an authentication mechanism that, with the help of the user, can authenticate each interaction of a given device with a WebServer by using an encrypted username, password, and token. This framework could be used for an automated burglar alarm system, guest attendance monitoring, and light switches, all of which are easily integrated with any smart city base. In this way, IoT solutions can allow real-time monitoring and connection with central systems for automated burglar alarms. The monitoring framework is developed on the strength of the web application to obtain real-time display, storage, and warning functions for local or remote monitoring control. The monitoring system is stable and reliable when applying SHA-256.
    Type of Medium: Online Resource
    ISSN: 1530-8677 , 1530-8669
    URL: Article
    DOI: 10.1155/2020/8896637
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2020
    detail.hit.zdb_id: 2045240-8
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  • 9
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    Synthesis of Bi 0.5 Li 0.5 TiO 3 Nanoparticles by Sol-Gel Method for Photocatalytic Methylene Blue Degradation and Antibacterial Activity
    Hindawi Limited ; 2019
    In:  Journal of Nanomaterials Vol. 2019 ( 2019-08-29), p. 1-9
    Details
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2019 ( 2019-08-29), p. 1-9
    Abstract: Facile synthesis of nanomaterials for advanced characterization and application is gaining interest from many researchers. In this study, Bi 0.5 Li 0.5 TiO 3 nanoparticles were synthesized through the sol-gel method. The photocatalytic activity of the synthesized Bi 0.5 Li 0.5 TiO 3 was investigated for degradation of methylene blue (MB) under UV irradiation. A photocatalytic efficiency of 74% was found at 150 min when the degradation was performed in the basic media, and the kinetic rate constant was calculated equal to 0.0093 min -1 . The antibacterial activity of Bi 0.5 Li 0.5 TiO 3 nanoparticles was evaluated against E. coli , and the results showed considerable efficiency.
    Type of Medium: Online Resource
    ISSN: 1687-4110 , 1687-4129
    URL: Article
    DOI: 10.1155/2019/5784610
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2019
    detail.hit.zdb_id: 2229480-6
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  • 10
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    Improving Efficacy of Endoscopic Diagnosis of Early Gastric Cancer: Gaps to Overcome from the Real-World Practice in Vietnam
    Hindawi Limited ; 2020
    In:  BioMed Research International Vol. 2020 ( 2020-04-27), p. 1-7
    Details
    In: BioMed Research International, Hindawi Limited, Vol. 2020 ( 2020-04-27), p. 1-7
    Abstract: Objective . To identify factors associated with increased proportion of early gastric cancer to total detected gastric cancer among patients undergoing diagnostic esophagogastroduodenoscopy. Methods . A nationwide survey was conducted across 6 central-type and 6 municipal-type Vietnamese hospitals. A questionnaire regarding annual esophagogastroduodenoscopy volume, esophagogastroduodenoscopy preparation, the use of image-enhanced endoscopy, and number of gastric cancer diagnosed in 2018 was sent to each hospital. Results . The total proportion of early gastric cancer was 4.0% (115/2857). Routine preparation with simethicone and the use of image-enhanced endoscopy were associated with higher proportion of early gastric cancer (OR 1.9, 95% CI: 1.1–3.2, p = 0.016 ; OR 2.7, 95% CI: 1.8–4.0, p 〈 0.001 , respectively). Esophagogastroduodenoscopies performed at central-type hospitals were associated with higher proportion of early gastric cancer (OR 1.9, 95% CI: 1.1–3.2, p = 0.017 ). Esophagogastroduodenoscopies performed at hospitals with an annual volume of 30.000–60.000 were associated with higher proportion of early gastric cancer than those performed at hospitals with an annual volume of 10.000- 〈 30.000 (OR 2.7, 95% CI: 1.6–4.8, p 〈 0.001 ) and with a volume of 〉 60.000–100.000 (OR 2.7, 95% CI: 1.7–4.2, p 〈 0.001 ). Only four (33.3%) hospitals reported all endoscopic types of early gastric cancer. Conclusions . The detection of early gastric cancer is still challenging even for endoscopists working in regions with relatively high prevalence. The real-world evidence showed that endoscopic detection of early gastric cancer could potentially improve with simple adjustments of esophagogastroduodenoscopy protocols.
    Type of Medium: Online Resource
    ISSN: 2314-6133 , 2314-6141
    URL: Article
    DOI: 10.1155/2020/7239075
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2020
    detail.hit.zdb_id: 2698540-8
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