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  • Hindawi Limited  (13)
  • 1
    Online Resource
    Online Resource
    An Enhanced Moth-Flame Optimization with Multiple Flame Guidance Mechanism for Parameter Extraction of Photovoltaic Models
    Hindawi Limited ; 2022
    In:  Mathematical Problems in Engineering Vol. 2022 ( 2022-6-11), p. 1-15
    Details
    In: Mathematical Problems in Engineering, Hindawi Limited, Vol. 2022 ( 2022-6-11), p. 1-15
    Abstract: How to accurately and efficiently extract photovoltaic (PV) model parameters is the primary problem of photovoltaic system optimization. To accurately and efficiently extract the parameters of PV models, an enhanced moth-flame optimization (EMFO) with multiple flame guidance mechanism is proposed in this study. In EMFO, an adaptive flame number updating mechanism is used to adaptively control the flame number, which enhances the local and global exploration capabilities of MFO. Meanwhile, a multiple flame guidance mechanism is designed for the full use of the position information of flames, which enhances the global diversity of the population. The EMFO is evaluated with other variants of the MFO on 25 benchmark functions of CEC2005, 28 functions of CEC2017, and 5 photovoltaic model parameter extraction problems. Experimental results show that the EMFO has obtained a better performance than other compared algorithms, which proves the effectiveness of the proposed EMFO. The method proposed in this study provides MFO researchers with ideas for adaptive research and making full use of flame population information.
    Type of Medium: Online Resource
    ISSN: 1563-5147 , 1024-123X
    URL: Article
    DOI: 10.1155/2022/8398768
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2014442-8
    SSG: 11
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  • 2
    Online Resource
    Online Resource
    Study on Vibration Response of Layered Media under the Impact Load
    Hindawi Limited ; 2021
    In:  Shock and Vibration Vol. 2021 ( 2021-10-11), p. 1-21
    Details
    In: Shock and Vibration, Hindawi Limited, Vol. 2021 ( 2021-10-11), p. 1-21
    Abstract: To study the vibration response of the layered medium under impact loading, single-layer concrete slabs, multilayer concrete slabs, and multilayer concrete slabs with a cemented filling layer were used as the working media to simulate the layered medium. A large number of impact loading tests were carried out by using a simple drop hammer device designed by us. The experimental results indicate that, under the impact load, the vibration response of the surface of the medium decreases with the increase in the distance to the impact source, showing the law of fast attenuation near field and slow attenuation far field, and the vibration energy moves to the low-frequency component; the vibration response increases with the increase in the impact energy, and the difference in the vibration response caused by the impact energy decreases as the distance increases; the vibration response is negatively correlated with the thickness of the dielectric layer, and the divergence of vibration response caused by impact energy decreases with the increase in the thickness of the dielectric layer. Due to the existence of the free surface and bedding, the vibration response of the layered medium surface increases with the increase in the number of layers and the vibration velocity response increases with the increase in the distance to the impact source when it is close to the free surface and far from the vibration source. For the filling of the cemented layer, the vibration response of the layered concrete slab becomes more complex under impact loading, showing obvious disorder. At the same time, this paper also used the dimensional analysis method to establish the calculation model of the peak response of vibration velocity of layered media under the impact load, which provided an idea for determining the peak response of vibration velocity of the layered media.
    Type of Medium: Online Resource
    ISSN: 1875-9203 , 1070-9622
    URL: Article
    DOI: 10.1155/2021/4161545
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2070162-7
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  • 3
    Online Resource
    Online Resource
    Hydrogeochemical Characteristics and Genesis of the Chazi Geothermal Field Area in Tibet
    Hindawi Limited ; 2022
    In:  Geofluids Vol. 2022 ( 2022-9-23), p. 1-20
    Details
    In: Geofluids, Hindawi Limited, Vol. 2022 ( 2022-9-23), p. 1-20
    Abstract: The Chazi geothermal field area is located in the large region of Shigatse in southern Tibet. The geothermal resources in this area are abundant, but their exploitation and utilization are low. By studying the water chemistry and isotope characteristics of geochemical fluids in the study area, information on water chemistry, heat storage temperature, recharge source, recharge elevation, and circulation depth was obtained. These results provide a scientific theoretical basis for improving the genetic mechanism of high-temperature geothermal systems in the study area. The type of geothermal fluid hydrochemicals in this area is mainly HCO3–Na. The isotopic geochemical method was used to determine that the recharge source of geothermal fluids was atmospheric precipitation, and the recharge elevation was 5200–6000 m. The geochemical thermometer, Na–K–Mg equilibrium diagram, and silica-enthalpy mixed model indicated the shallow and deep thermal storage temperatures of approximately 150 and 200°C, respectively, and the average circulation depth of 1163.38 m in the study area. Combined with the fracture structure and magmatic activity characteristics of the southwest Qinghai-Tibet Plateau, the source, storage, cover, and general situation of the area were preliminarily summarised, and the conceptual model of geothermal origin was established. The results can provide a scientific theoretical basis for the mechanism of high-temperature geothermal systems and subsequent drilling and resource development.
    Type of Medium: Online Resource
    ISSN: 1468-8123 , 1468-8115
    URL: Article
    DOI: 10.1155/2022/5815996
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2045012-6
    SSG: 13
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  • 4
    Online Resource
    Online Resource
    Research on Failure Characteristics and Zoning Control Technology of Thick-Soft Surrounding Rock for Deep Gob-Side Entry Retaining
    Hindawi Limited ; 2020
    In:  Shock and Vibration Vol. 2020 ( 2020-11-23), p. 1-14
    Details
    In: Shock and Vibration, Hindawi Limited, Vol. 2020 ( 2020-11-23), p. 1-14
    Abstract: Controlling the large deformation caused by bed separation failure of thick and soft surrounding rock in gob-side entry retaining is difficult. The deformation and failure modes of thick and soft surrounding rock are summarized and classified based on field research, theoretical analysis, laboratory tests, and actual measurements. Systematic research is conducted on the lithologic characteristics, failure characteristics, and control methods of the surrounding rock. The research findings are as follows: (1) The low strength, softening, and water swelling of thick mudstone, as well as its cataclasis, dilatancy, and long-term creep under strong mining and high stress are the objective reasons for large deformation of the surrounding rock. (2) Due to the weak stability of the surrounding rock-support structure and low collaborative roof side bearing capacity, no complete supporting structure is formed with the supporting system, causing the support body in each area to be crushed one by one, which is the subjective reason for the deformation and failure of the surrounding rock. (3) The deformation and failure characteristics of thick and soft surrounding rock in gob-side entry retaining are primarily divided into eight types: roof bending and sinking type, roof cutting along filling body, rib spalling type, roof fall type, filling body rotation type, filling body crushing type, roof step type, and roof cutting along the coal side. The initial points and key points for a chain reaction of each failure type are determined. (4) The surrounding rock is divided into 10 support zones at four levels, and control technology for “zonal support and overall reinforcement” is put forward. The mechanical effect of the support body in each zone and its role in maintaining the stability of surrounding rock are analyzed. This technology can ensure the integrity of the surrounding rock structure and improve the roof side collaborative bearing capacity.
    Type of Medium: Online Resource
    ISSN: 1875-9203 , 1070-9622
    URL: Article
    DOI: 10.1155/2020/6613514
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2020
    detail.hit.zdb_id: 2070162-7
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  • 5
    Online Resource
    Online Resource
    Design and performance study of a low concentration photovoltaic-thermal module
    Hindawi Limited ; 2018
    In:  International Journal of Energy Research Vol. 42, No. 6 ( 2018-05), p. 2199-2212
    Details
    In: International Journal of Energy Research, Hindawi Limited, Vol. 42, No. 6 ( 2018-05), p. 2199-2212
    Type of Medium: Online Resource
    ISSN: 0363-907X
    URL: Issue
    URL: Article
    DOI: 10.1002/er.v42.6
    DOI: 10.1002/er.4009
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2018
    detail.hit.zdb_id: 1480879-1
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  • 6
    Online Resource
    Online Resource
    Optimal Wireless Information and Power Transfer Using Deep Q-Network
    Hindawi Limited ; 2021
    In:  Wireless Power Transfer Vol. 2021 ( 2021-5-15), p. 1-12
    Details
    In: Wireless Power Transfer, Hindawi Limited, Vol. 2021 ( 2021-5-15), p. 1-12
    Abstract: In this paper, a multiantenna wireless transmitter communicates with an information receiver while radiating RF energy to surrounding energy harvesters. The channel between the transceivers is known to the transmitter, but the channels between the transmitter and the energy harvesters are unknown to the transmitter. By designing its transmit covariance matrix, the transmitter fully charges the energy buffers of all energy harvesters in the shortest amount of time while maintaining the target information rate toward the receiver. At the beginning of each time slot, the transmitter determines the particular beam pattern to transmit with. Throughout the whole charging process, the transmitter does not estimate the energy harvesting channel vectors. Due to the high complexity of the system, we propose a novel deep Q-network algorithm to determine the optimal transmission strategy for complex systems. Simulation results show that deep Q-network is superior to the existing algorithms in terms of the time consumption to fulfill the wireless charging process.
    Type of Medium: Online Resource
    ISSN: 2052-8418
    URL: Article
    DOI: 10.1155/2021/5513509
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2772406-2
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  • 7
    Online Resource
    Online Resource
    Differential Evolution with Autonomous Selection of Mutation Strategies and Control Parameters and Its Application
    Hindawi Limited ; 2022
    In:  Complexity Vol. 2022 ( 2022-7-21), p. 1-18
    Details
    In: Complexity, Hindawi Limited, Vol. 2022 ( 2022-7-21), p. 1-18
    Abstract: The existing numerous adaptive variants of differential evolution (DE) have been improved the search ability of classic DE to certain extent. Nevertheless, those variants of DE do not obtain the promising performance in solving black box problems with unknown features, which is mainly because the adaptive rules of those variants are designed according to their designers’ cognition on the problem features. To enhance the optimization ability of DE in optimizing black box problems with unknown features, a differential evolution with autonomous selection of mutation strategies and control parameters (ASDE) is proposed in this paper, inspired by autonomous decision-making mechanism of reinforcement learning. In ASDE, a historical experience archive with population features is utilized to preserve accumulated historical experience of the combination of mutation strategies and control parameters. Furthermore, the accumulated historical experience can be autonomously mapped into rules repository, and the individuals can choose the combination of mutation strategies and control parameters according to those rules. Additionally, an updating and utilization mechanism of the historical experience is designed to assure that the historical experience can be effectively accumulated and utilized efficiently. Compared with some state-of-the-art intelligence algorithms on 15 functions of CEC2015, 28 functions of CEC2017, and parameter extraction problems of the photovoltaic model, ASDE has the advantages of solution accuracy, convergence speed, and robustness in solving black box problems with unknown features.
    Type of Medium: Online Resource
    ISSN: 1099-0526 , 1076-2787
    URL: Article
    DOI: 10.1155/2022/7275088
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2004607-8
    SSG: 11
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  • 8
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    Online Resource
    The investigation of desulphurization and water recovery from flue gas using ceramic composite membrane
    Hindawi Limited ; 2019
    In:  International Journal of Energy Research Vol. 43, No. 5 ( 2019-04), p. 1747-1759
    Details
    In: International Journal of Energy Research, Hindawi Limited, Vol. 43, No. 5 ( 2019-04), p. 1747-1759
    Type of Medium: Online Resource
    ISSN: 0363-907X
    URL: Issue
    URL: Article
    DOI: 10.1002/er.v43.5
    DOI: 10.1002/er.4385
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2019
    detail.hit.zdb_id: 1480879-1
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  • 9
    Online Resource
    Online Resource
    Simulation and experiment of a PV‐MCHP‐TE system and ambient parameters impacts
    Hindawi Limited ; 2020
    In:  International Journal of Energy Research Vol. 44, No. 6 ( 2020-05), p. 4595-4604
    Details
    In: International Journal of Energy Research, Hindawi Limited, Vol. 44, No. 6 ( 2020-05), p. 4595-4604
    Type of Medium: Online Resource
    ISSN: 0363-907X , 1099-114X
    URL: Issue
    URL: Article
    DOI: 10.1002/er.v44.6
    DOI: 10.1002/er.5240
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2020
    detail.hit.zdb_id: 1480879-1
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  • 10
    Online Resource
    Online Resource
    Enhancing laccase‐induced soybean protein isolates gel properties by microwave pretreatment
    Hindawi Limited ; 2020
    In:  Journal of Food Processing and Preservation Vol. 44, No. 4 ( 2020-04)
    Details
    In: Journal of Food Processing and Preservation, Hindawi Limited, Vol. 44, No. 4 ( 2020-04)
    Type of Medium: Online Resource
    ISSN: 0145-8892 , 1745-4549
    URL: Issue
    URL: Article
    DOI: 10.1111/jfpp.v44.4
    DOI: 10.1111/jfpp.14386
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2020
    detail.hit.zdb_id: 2175273-4
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