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1
Content available remote Research on Grid-Connected Photovoltaic System Based on Improved Algorithm
100%
Cai W. , Ren H.
Przegląd Elektrotechniczny
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2012
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tom R. 88, nr 3b
22-25
EN
In order to simulate and predict the behaviors of the real photovoltaic system, this paper develops a grid-connected photovoltaic simulation system with maximum power point tracking (MPPT) function using MATLAB software. An engineering model for the photovoltaic (PV) cell is first established and then combined with the models of an MPPT controller and a DC-DC converter. This paper uses an improved algorithm in the MPPT controller by comparing with the commonly-used algorithms. A DC-AC inverter using double closed loop control method is used to track the grid characteristics. The simulation results show that the system not only achieves the maximum power point tracking function quickly but also modulates the outputs of the inverter into sine waveforms accompanied with fewer ripples. And the power factor is close to 1.
PL
W artykule zaproponowano symulację połączonego sieciowo system fotowoltaicznego z funkcja śledzenia maksymalnej mocy. Zaproponowano model inżynierski w MATLABie złożony ze sterownika i przekształtnika. Przekształtnik DC-AC wykorzystuje podwójną zamkniętą pętlę sterowania.
2
Potholes of mountain river as biodiversity spots: structure and dynamics of the benthic invertebrate community
70%
Ren H. , Yuan X. , Yue J. , Wang X. , Liu H.
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tom 64
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nr 1
EN
Temporary freshwater rock pools, as special, small-sized and isolated habitats, provide ideal systems for studying island biogeography and ecological theories and processes. In this study, a total of 70 potholes of mountain rivers were sampled during the four seasons from November 2013 to October 2014 to assess the structure of the benthic invertebrate community and to identify the relationships between habitat characteristics and the community composition. Pothole area ranged from approximately 0.01 to 0.39 m², and pothole depth ranged from 0.03 to 0.74 m. Forty-three taxa belonging to 37 families and 16 orders were collected from the potholes. The highest numbers of benthic invertebrate taxa were observed in summer and the highest average number of taxa per pothole (8.5) was observed in autumn. The diversity was the highest in spring, and the average densities of benthic invertebrates were highest in autumn. Large potholes supported more taxa than small ones and significant relationships between richness and pothole area, richness and water volume were observed. The results of Redundancy Analysis show that the community composition of benthic invertebrates in the potholes was closely correlated with water temperature, pothole area and water depth. Our results indicate that benthic invertebrate communities in river potholes are mainly structured by water depth, pothole area and water volume. The seasonal changes are also an important factor determining the presence/absence of certain taxa.
3
Content available remote Potholes of Mountain River as Biodiversity Spots : Structure and Dynamics of the Benthic Invertebrate Community
70%
Ren H. , Yuan X. , Yue J. , Wang X. , Liu H.
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2016
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tom Vol. 64, nr 1
70--83
EN
Temporary freshwater rock pools, as special, small-sized and isolated habitats, provide ideal systems for studying island biogeography and ecological theories and processes. In this study, a total of 70 potholes of mountain rivers were sampled during the four seasons from November 2013 to October 2014 to assess the structure of the benthic invertebrate community and to identify the relationships between habitat characteristics and the community composition. Pothole area ranged from approximately 0.01 to 0.39 m2, and pothole depth ranged from 0.03 to 0.74 m. Forty-three taxa belonging to 37 families and 16 orders were collected from the potholes. The highest numbers of benthic invertebrate taxa were observed in summer and the highest average number of taxa per pothole (8.5) was observed in autumn. The diversity was the highest in spring, and the average densities of benthic invertebrates were highest in autumn. Large potholes supported more taxa than small ones and significant relationships between richness and pothole area, richness and water volume were observed. The results of Redundancy Analysis show that the community composition of benthic invertebrates in the potholes was closely correlated with water temperature, pothole area and water depth. Our results indicate that benthic invertebrate communities in river potholes are mainly structured by water depth, pothole area and water volume. The seasonal changes are also an important factor determining the presence/absence of certain taxa.
4
Content available A new adaptation for in vitro co-culture of single porcine parthenogenetic embryos using feeder cells
51%
Zhang L. , Lin Z. , Hua Z. , Zheng X. , Xiao H. , Hua W. , Ren H. , Zhu Z. , Molenaar A. , Bi Y.
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nr 4
5
Content available Impact of different sources of donor cells upon the nuclear transfer efficiency in Chinese indigenous Meishan pig
51%
Liu X. , Hua Z. , Zhang L. , Zheng X. , Xiao H. , Xu G. , Bi Y. , Hua W. , Li L. , Ren H.
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nr 1
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