Wyniki wyszukiwania

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A flexible control strategy for shore-to-ship power system in terms of grid connected and off-grid switch

100%

Ji Z., Zhao Z., Wang J., Lv Z.

Polish Maritime Research

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2018

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tom 25

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nr Special Issue S2

There are promising application prospects for applying the shore power technology to the ships in the port for the purpose of pollution prevention. However, the grid-connection of the shore power supply to the ship power grid leads to current surges, damages the ship power consumption equipment, and results in the instability of the ship power grid system, which will seriously affect the reliability of the operation of the ship power grid system. In order to address this problem, the mathematical model of virtual synchronous generator is introduced in this paper. Then, a control method for the flexible grid-connection of the shore power supply to the ship power grid based on the virtual synchronous generator is proposed. Next, the output characteristics of the shore power supply are optimized to match the characteristics of the ship generator, which contributes to the flexible grid-connection of the shore power supply to the ship power grid system. The effectiveness and the feasibility of this method are verified by simulation and experiments

2

Visualization investigation on the marine data with multivariate statistical analysis methods

100%

Li Y., Lv Z., Wang M.

Polish Maritime Research

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2017

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tom 24

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nr Special Issue S2

Marine information is an important way for us to know and study more about the ocean. Marine data makes the basic of marine information. Because of the huge quantity and diversity of marine data, and at the same time marine data is polyatomic variable, we start with statistical analysis methods to search for the regularity of the marine data. On one hand, we get the aggregate variation functions of the marine data by factor analyzing in aspect of the spatiality. Then we visually describe the marine status of the studied sea area with pre variogram function and post variogram function. On the other hand, we used cluster analysis method to get the verifying rule in time and make visible graphs of the marine data. In this way, we can also supply with the suggestions in classifying the sea seawater quality. The data processing result shows that the suggested methods in this article are both operable and effective. At the same time some reasonable suggestions are given in the article

3

Entropy-cloud model of heavy metals pollution assessment in farmland soils of mining areas

88%

Yang J., Liu H., Yu X., Lv Z., Xiao F.

Polish Journal of Environmental Studies

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2016

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tom 25

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nr 3

An entropy-cloud model is proposed to deal with soil heavy metal pollution assessment based on entropy and cloud model theory. Parameters of the cloud model of each heavy metal level are calculated with the chosen indicators, and hybrid entropy weights are determined based on Shannon entropy and the analytic hierarchy process (AHP) to generate an entropy-cloud model of all indicators. Certainty degrees of each level are calculated by the entropy-cloud model, and the fuzzy entropy of certainty degrees is calculated to indicate the complexity of heavy metal pollution. Heavy metal pollution of 10 farmland soils in mining areas is assessed by the entropy-cloud model. Comparative studies with variable fuzzy sets, artificial neural network, and normal cloud model show that the entropy-cloud model is effective and intuitive, which can assess the soil heavy metal pollution from two aspects of level and complexity. Different from other methods, this model provides a new way to assess soil heavy metal pollution.

4

Pinellia ternata agglutinin produced in Bombyx mori cells exhibits bioactivity

88%

Xu T., Wang B., Wang L., Zhang Y., Lv Z.

Acta Biochimica Polonica

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2012

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tom 59

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nr 2

Pinellia ternata agglutinin (PTA) is highly homologous to many other monocot mannose-binding lectins which reportedly possess antitumor activities. Its production in silkworm cells has great application potential because the baculovirus expression system can produce post-translationally modified proteins at low cost. In the current study, the pta gene was cloned and expressed in silkworm cells, and the expressed protein was analyzed using a hemagglutination assay. A preliminary in vitro study on its anti-proliferative activity was performed. The results show that the recombinant PTA with an apparent molecular mass of 29 kDa can hemagglutinate rabbit erythrocytes and this activity can be inhibited by D-mannan at a low concentration. In addition, the recombinant hemagglutinin exhibited a dose-dependent anti-proliferative activity on hepatoma cells. The results of the current study suggest that PTA and other important bioactive proteins could be produced by silkworm bioreactor for biomedicine research and application.

5

Effects of recent and potential land use and climate changes on runoff and sediment load in the Upper Yellow River Basin, China

76%

Lv Z., Qin T., Wang Y., Mu J., Liu S., Nie H.

Polish Journal of Environmental Studies

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2020

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tom 29

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nr 6

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Comparison of chicken immune responses after inoculation with H5 avian influenza virus-like particles produced by insect cells or pupae

64%

Huang D., Chao Y.-C., Lv Z., Jan J.-T., Yang Y.-C., Hsiao P.-W., Wu C.-Y., Liao C.-H., Wu T.-H., Wang Y.-C.

Journal of Veterinary Research

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2021

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tom 65

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nr 2

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Transplant tolerance: current insights and strategies for long-term survival of xenografts

64%

Liu L., He C., Liu J., Lv Z., Wang G., Gao H., Dai Y., Cooper D. K. C., Cai Z., Mou L.

Archivum Immunologiae et Therapiae Experimentalis

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