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  • 1
    Online Resource
    Online Resource
    Detection of Cd2+ based on Nano-Fe3O4/MoS2/Nafion/GCE sensor
    Springer Science and Business Media LLC ; 2023
    In:  Analytical Sciences Vol. 39, No. 9 ( 2023-09), p. 1445-1454
    Details
    In: Analytical Sciences, Springer Science and Business Media LLC, Vol. 39, No. 9 ( 2023-09), p. 1445-1454
    Abstract: It is necessary to detect cadmium ions in seawater with high sensitivity because the pollution of cadmium ions seriously endangers the health and life of human beings. Nano-Fe 3 O 4 /MoS 2 /Nafion modified glassy carbon electrode was prepared by a drop coating method. The electrocatalytic properties of Nano-Fe 3 O 4 /MoS 2 /Nafion were measured by Cyclic Voltammetry (CV). Differential Pulse Voltammetry (DPV) was used to study the stripping Voltammetry response of the modified electrode to Cd 2+ . The optimal conditions were determined: In 0.1 mol/L HAc-NaAc solution, the solution pH was 4.2, the deposition potential was − 1.0 V, and the deposition time was 720 s, the membrane thickness was 8 μL. Under the optimum condition, the linear relation of Cd 2+ concentration was found in the range of 5–300 μg/L, and the detection limit was 0.053 μg/L. The recovery of Cd 2+ in seawater ranged from 99.2 to 102.9%. A composite material with simple operation, rapid response and high sensitivity was constructed for the determination of Cd 2+ in seawater. Graphical abstract
    Type of Medium: Online Resource
    ISSN: 0910-6340 , 1348-2246
    URL: Article
    DOI: 10.1007/s44211-023-00359-9
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 1483376-1
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  • 2
    Online Resource
    Online Resource
    Design of Control System for Multistage Distillation Seawater Desalination Device Driven by Photovoltaic-Thermal
    MDPI AG ; 2023
    In:  Journal of Marine Science and Engineering Vol. 11, No. 1 ( 2023-01-14), p. 222-
    Details
    In: Journal of Marine Science and Engineering, MDPI AG, Vol. 11, No. 1 ( 2023-01-14), p. 222-
    Abstract: This research proposes a seawater desalination system driven by photovoltaic and solar thermal energy for remote regions such as islands and seaside villages where fresh water is not accessible. The performance of this system is demonstrated through experiments, and the main concerns are the output of the photovoltaic power generation system, power quantity, water yield, and the loads under different solar irradiance and temperature. In this system, a PLC is used as the controller to adjust the water pump by the collection and processing of sensor data. A load switching time system is designed to select different operating schemes under different environments in order to save energy. The control method of this system is developed to ensure that the photovoltaic power generation system does not undervoltage while maintaining the normal operation of the desalination system. An improved Perturbation and Observation (P & O) algorithm is also proposed as a new Maximum Point Power Tracking (MPPT) method to solve the problem of misjudgment and oscillation after tracking the maximum power point (MPP) in the traditional P & O algorithm. The simulation test in the MATLAB/Simulink environment shows that when external irradiance changes, the improved P & O algorithm can track the MPP faster than the traditional P & O algorithm, and the amplitude of oscillation on the MPP is smaller. The hardware experiments show that this system can operate stably and flexibly, and it is capable of producing 5.18 kWh of electric energy and 335.81 kg of freshwater per day. The maximum yield of the unit can reach 565.75 kg per day and the maximum daily power generation is 8.12 kWh.
    Type of Medium: Online Resource
    ISSN: 2077-1312
    URL: Article
    DOI: 10.3390/jmse11010222
    Language: English
    Publisher: MDPI AG
    Publication Date: 2023
    detail.hit.zdb_id: 2738390-8
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  • 3
    Online Resource
    Online Resource
    ZnO-CNT/Nano-Au modified electrodes for the detection of trace Hg(II) in coastal seawater
    IOP Publishing ; 2023
    In:  Materials Research Express Vol. 10, No. 1 ( 2023-01-01), p. 015503-
    Details
    In: Materials Research Express, IOP Publishing, Vol. 10, No. 1 ( 2023-01-01), p. 015503-
    Abstract: Mercury (Hg) in seawater enters the body through the food chain, causing damage to organs and the nervous system. Thus, there is an urgent need to explore a rapid and convenient sensor for the detection and monitoring of Hg(II) in seawater. Herein, a ZnO-CNTs/Nano-Au modified glassy carbon electrode was prepared by the dropping method. The structure of the composite membrane is mainly observed by scanning electron microscopy (SEM), and the results show that the composite has a larger specific surface area. Moreover, the composite can increase the ion adsorption of the surface electrode and enhance the conductivity. Differential pulse voltammetry (DPV) was applied to determine trace amounts of Hg(II) in seawater. The optimized conditions were as follows: accumulation potential, accumulation time, pH value, film thickness and concentration. Under the optimal experimental conditions, the linear relationship between the values of the oxidation peak current and concentration was kept in the range of 1.49 ∼ 5.97 μ M, with a linear correlation coefficient R 2 = 0.991 and a detection limit of Hg(II) of 0.0118 μ M. The proposed method was applied to the analysis of coastal water of the Maowei Sea, giving values of recovery in the range of 94.2%∼98.4%. The ZnO-CNTs/Nano-Au-modified electrode has high sensitivity, convenient operation and good practical application value.
    Type of Medium: Online Resource
    ISSN: 2053-1591
    URL: Article
    DOI: 10.1088/2053-1591/acafd6
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2760382-9
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  • 4
    Online Resource
    Online Resource
    Integrated Optimization Method of IPPS under TOU and Tiered Electricity Price
    Hindawi Limited ; 2021
    In:  Discrete Dynamics in Nature and Society Vol. 2021 ( 2021-8-23), p. 1-11
    Details
    In: Discrete Dynamics in Nature and Society, Hindawi Limited, Vol. 2021 ( 2021-8-23), p. 1-11
    Abstract: Energy-saving production is one of the issues that must be paid attention to by today’s manufacturing enterprises. Aiming at the problem of integrated process planning and scheduling (IPPS) in the manufacturing process, considering Time-of-Use (TOU) and tiered electricity price, this paper systematically studies the energy-saving scheduling problem in order to reduce the power consumption in processing and production. To establish the multiobjective optimization mathematical model of the problem, the load balancing problem of the equipment is considered, the minimization of the power consumption and the maximum load of the equipment are taken as the optimization objectives. Then, considering the constraints of resource and multiprocess, the switching strategy of the equipment in idle time is introduced, including shutdown and restart operations. In order to solve the model easily, a multiobjective firefly algorithm (MOFA) based on five-layer coding is designed, and the elite strategy is introduced to protect the excellent firefly individuals in the iterative population. Finally, through a specific example, the Pareto solution set is obtained, which provides a reference scheme for decision-makers, and verifies the correctness of the model and the effectiveness of the algorithm.
    Type of Medium: Online Resource
    ISSN: 1607-887X , 1026-0226
    URL: Article
    DOI: 10.1155/2021/8081618
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2033014-5
    SSG: 11
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  • 5
    Online Resource
    Online Resource
    DataSheet_1.docx
    Frontiers Media SA ; 2023
    In:  Frontiers in Plant Science Vol. 14 ( 2023-5-29)
    Details
    In: Frontiers in Plant Science, Frontiers Media SA, Vol. 14 ( 2023-5-29)
    Abstract: Coptis plants (Ranunculaceae) contain high levels of isoquinoline alkaloids and have a long history of medicinal use. Coptis species are of great value in pharmaceutical industries and scientific research. Mitochondria are considered as one of the central units for receiving stress signals and arranging immediate responses. Comprehensive characterizations of plant mitogenomes are imperative for revealing the relationship between mitochondria, elucidating biological functions of mitochondria and understanding the environmental adaptation mechanisms of plants. Here, the mitochondrial genomes of C. chinensis , C. deltoidea and C. omeiensis were assembled through the Nanopore and Illumina sequencing platform for the first time. The genome organization, gene number, RNA editing sites, repeat sequences, gene migration from chloroplast to mitochondria were compared. The mitogenomes of C. chinensis , C. deltoidea and C. omeiensis have six, two, two circular-mapping molecules with the total length of 1,425,403 bp, 1,520,338 bp and 1,152,812 bp, respectively. The complete mitogenomes harbors 68-86 predicted functional genes including 39-51 PCGs, 26-35 tRNAs and 2-5 rRNAs. C. deltoidea mitogenome host the most abundant repeat sequences, while C. chinensis mitogenome has the largest number of transferred fragments from its chloroplasts. The large repeat sequences and foreign sequences in the mitochondrial genomes of Coptis species were related to substantial rearrangements, changes in relative position of genes and multiple copy genes. Further comparative analysis illustrated that the PCGs under selected pressure in mitochondrial genomes of the three Coptis species mainly belong to the mitochondrial complex I (NADH dehydrogenase). Heat stress adversely affected the mitochondrial complex I and V, antioxidant enzyme system, ROS accumulation and ATP production of the three Coptis species. The activation of antioxidant enzymes, increase of T-AOC and maintenance of low ROS accumulation in C. chinensis under heat stress were suggested as the factors for its thermal acclimation and normal growth at lower altitudes. This study provides comprehensive information on the Coptis mitogenomes and is of great importance to elucidate the mitochondrial functions, understand the different thermal acclimation mechanisms of Coptis plants, and breed heat-tolerant varieties.
    Type of Medium: Online Resource
    ISSN: 1664-462X
    URL: Article
    URL: Article
    DOI: 10.3389/fpls.2023.1166420
    DOI: 10.3389/fpls.2023.1166420.s001
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2023
    detail.hit.zdb_id: 2687947-5
    detail.hit.zdb_id: 2613694-6
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  • 6
    Online Resource
    Online Resource
    MWCNT/Nafion/Lead Ionophore Modified Electrode for The Detection of Trace Pb 2+ in Coastal Seawater
    IOP Publishing ; 2021
    In:  Journal of Physics: Conference Series Vol. 1820, No. 1 ( 2021-03-01), p. 012139-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 1820, No. 1 ( 2021-03-01), p. 012139-
    Abstract: Lead ions in coastal seawater will be enriched in marine organisms, further to endanger human health, so it is essential to conduct detection with high-sensitivity and high-selectivity for lead ions concentration in seawater. In this paper, multi-walled carbon nanotubes (MWCNT)/Nafion/lead ionophore electrode modification materials have been prepared therefore to obtain modified glassy carbon electrodes by a coating method. In order to define trace levels of Pb 2+ , differential pulse stripping voltammetry (DPSV) was used. Moreover, the experimental conditions i.e. accumulation potential, concentration, pH, accumulation time were in optimized condition. Thereby, results show that the peak current which was obtained in the range of 3~100 μg·L − 1 for Pb 2+ have a linear relationship with concentration corresponded, with the detection limits of 1.2 μg·L − 1 for Pb 2+ . The modified electrode was used to determine the Pb 2+ content in the coastal seawater of the Maowei Sea, and the recovery rate was between 90.4%~104.7%, which provided a novel approach of detection to define trace Pb 2+ in seawater.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/1820/1/012139
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2166409-2
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  • 7
    Online Resource
    Online Resource
    DataSheet1.PDF
    Frontiers Media SA ; 2022
    In:  Frontiers in Chemistry Vol. 10 ( 2022-8-25)
    Details
    In: Frontiers in Chemistry, Frontiers Media SA, Vol. 10 ( 2022-8-25)
    Abstract: Benzo(a)pyrene, as the main polycyclic aromatic hydrocarbon pollutant in marine oil spill pollution, has negative effects on marine ecology and human health. A facile and sensitive method of rapid benzo(a)pyrene detection in seawater is essential for marine conservation. In this paper, a novel immunosensor is fabricated using a multi-walled carbon nanotubes-chitosan composite loaded with benzo(a)pyrene antibody. This immunosensor is based on a biosensing assay mechanism that uses multi-walled carbon nanotubes-chitosan composites as conductive mediators to enhance electron transfer kinetics. Then, potassium ferricyanide was used as an electrochemical probe to produce an electrochemical signal for the voltammetric behavior investigation of the immune response by differential pulse voltammetry. Under optimal experimental conditions, the peak current change was inversely proportional to the benzo(a)pyrene concentration in the range of 0.5 ng⋅ml −1 and 80 ng⋅ml −1 with a detection limit of 0.27 ng⋅ml −1 . The immunosensor was successfully applied to assay BaP in seawater, and the recovery was between 96.6 and 100%, which exhibited a novel, sensitive and interference-resistant analytical method for real-time water environment monitoring. The results demonstrate that the proposed immunosensor has a great potential for application in the monitoring of seawater.
    Type of Medium: Online Resource
    ISSN: 2296-2646
    URL: Article
    URL: Article
    DOI: 10.3389/fchem.2022.950854
    DOI: 10.3389/fchem.2022.950854.s001
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2022
    detail.hit.zdb_id: 2711776-5
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  • 8
    Online Resource
    Online Resource
    A Survey on Energy Internet: Architecture, Approach, and Emerging Technologies
    Institute of Electrical and Electronics Engineers (IEEE) ; 2018
    In:  IEEE Systems Journal Vol. 12, No. 3 ( 2018-9), p. 2403-2416
    Details
    In: IEEE Systems Journal, Institute of Electrical and Electronics Engineers (IEEE), Vol. 12, No. 3 ( 2018-9), p. 2403-2416
    Type of Medium: Online Resource
    ISSN: 1932-8184 , 1937-9234 , 2373-7816
    URL: Journal
    URL: Article
    DOI: 10.1109/JSYST.4267003
    DOI: 10.1109/JSYST.2016.2639820
    Language: Unknown
    Publisher: Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018
    detail.hit.zdb_id: 2260091-7
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  • 9
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    Online Resource
    Intelligent Prediction Model of Shanghai Composite Index Based on Technical Indicators and Big Data Analysis
    Darcy & Roy Press Co. Ltd. ; 2023
    In:  Highlights in Business, Economics and Management Vol. 17 ( 2023-08-31), p. 370-389
    Details
    In: Highlights in Business, Economics and Management, Darcy & Roy Press Co. Ltd., Vol. 17 ( 2023-08-31), p. 370-389
    Abstract: Technical indicators provide useful information for investors to study the stock market. Based on the Shanghai Composite index from November 1994 to March 2022, we construct 20 technical indicators based on the moving-average (MA) rules, momentum (MOM) rules and volume on balance (VOL) rules, and model and analyze through ordinary least squares and extracted principal components. We found that the technical indicators provide effective information for the forecasting of the excess return rate of the Shanghai Composite index both in- and out-of sample, and the model has more superior forecasting performance in the decline period of the business cycle. In addition, this paper finds that the information provided by the technical indicators can better predict the rise of the peak front and the trough front of the business cycle. Finally, this paper studies the economic significance of the yield forecasting using technical indicators, and finds that the information in technical indicators can help investors to obtain better investment returns without transaction fees.
    Type of Medium: Online Resource
    ISSN: 2957-952X
    URL: Article
    DOI: 10.54097/hbem.v17i.11486
    Language: Unknown
    Publisher: Darcy & Roy Press Co. Ltd.
    Publication Date: 2023
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  • 10
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    Online Resource
    The Method and Study of Detecting Phenanthrene in Seawater Based on a Carbon Nanotube–Chitosan Oligosaccharide Modified Electrode Immunosensor
    MDPI AG ; 2023
    In:  Molecules Vol. 28, No. 15 ( 2023-07-27), p. 5701-
    Details
    In: Molecules, MDPI AG, Vol. 28, No. 15 ( 2023-07-27), p. 5701-
    Abstract: Phenanthrene (PHE), as a structurally simple, tricyclic, polycyclic aromatic hydrocarbon (PAHs), is widely present in marine environments and organisms, with serious ecological and health impacts. It is crucial to study fast and simple high-sensitivity detection methods for phenanthrene in seawater for the environment and the human body. In this paper, a immunosensor was prepared by using a multi-wall carbon nanotube (MWCNTs)-chitosan oligosaccharide (COS) nanocomposite membrane loaded with phenanthrene antibody. The principle was based on the antibody–antigen reaction in the immune reaction, using the strong electron transfer ability of multi-walled carbon nanotubes, coupled with chitosan oligosaccharides with an excellent film formation and biocompatibility, to amplify the detection signal. The content of the phenanthrene in seawater was studied via differential pulse voltammetry (DPV) using a potassium ferricyanide system as a redox probe. The antibody concentration, pH value, and probe concentration were optimized. Under the optimal experimental conditions, the response peak current of the phenanthrene was inversely proportional to the concentration of phenanthrene, in the range from 0.5 ng·mL−1 to 80 ng·mL−1, and the detection limit was 0.30 ng·mL−1. The immune sensor was successfully applied to the detection of phenanthrene in marine water, with a recovery rate of 96.1~101.5%, and provided a stable, sensitive, and accurate method for the real-time monitoring of marine environments.
    Type of Medium: Online Resource
    ISSN: 1420-3049
    URL: Article
    DOI: 10.3390/molecules28155701
    Language: English
    Publisher: MDPI AG
    Publication Date: 2023
    detail.hit.zdb_id: 2008644-1
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