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  • IOP Publishing  (4)
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  • IOP Publishing  (4)
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  • 1
    Online Resource
    Online Resource
    Effects of Tillage Practices on Soil Fertility in Loess Plateau
    IOP Publishing ; 2019
    In:  IOP Conference Series: Earth and Environmental Science Vol. 300, No. 2 ( 2019-07-01), p. 022069-
    Details
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 300, No. 2 ( 2019-07-01), p. 022069-
    Abstract: In order to determine whether there is a threat to soil nutrient content by long-term no-tillage cultivation in loess plateau, a suitable high-yield and high-efficiency tillage technology system is established. This study was conducted in the Changwu Loess Plateau Agro-ecological Experiment Station of the Northwest A & F University in Changwu County, Shaanxi Province. The experimental field for no-tillage cultivation was selected for three consecutive years. In September 2015, no-tillage and tillage were carried out separately before winter wheat planting. And rotary tillage 3 kinds of farming treatment. After harvesting of winter wheat in 2016, the contents of available phosphorus, available potassium in 0∼30 cm soil layer under different tillage methods were analyzed. The results showed that in the 0∼30cm soil layer, the contents of available phosphorus and available potassium in the soil under three tillage methods decreased along the profile. The contents of available phosphorus and available potassium in 0∼10 cm soil layer were significantly higher than that of tillage and rotary tillage (p 〈 0.05). The contents of available phosphorus and available potassium in soil of 10∼30cm soil were ploughed tillage 〉 rotary tillage 〉 no-tillage, and there was no significant difference among the three tillage methods in 10-20cm soil layer.
    Type of Medium: Online Resource
    ISSN: 1755-1307 , 1755-1315
    URL: Article
    DOI: 10.1088/1755-1315/300/2/022069
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2434538-6
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Simulation of partial discharge sequences using fluid equations
    IOP Publishing ; 2011
    In:  Journal of Physics D: Applied Physics Vol. 44, No. 25 ( 2011-06-29), p. 255201-
    Details
    In: Journal of Physics D: Applied Physics, IOP Publishing, Vol. 44, No. 25 ( 2011-06-29), p. 255201-
    Abstract: Simulation methods employing continuity equations to describe particle transportation are used to examine the process of single discharge. However, it is difficult to simulate partial discharge (PD) behaviour accurately by these methods, because it will take too much computation time to simulate consecutive PD sequences. In this report, in order to save computation time, a simple three-dimensional network is used to simulate PD sequences in a small void under ac voltage. The model considers charge generation, charge transport and charge disappearance, and electrical field redistribution in three dimensions. The continuity equations for electrons, positive ions and negative ions, including the effects of ionization, attachment, recombination, electron diffusion and the transport of charge under electrical field are solved simultaneously with Poisson's equation. With this model, the phase-resolved PD pattern and the current forms of each PD are obtained. Moreover, considering the propagation process of each PD and its influence on surface charge distribution, the fall part of PD current form and the effect of previous discharge on the subsequent one are also studied.
    Type of Medium: Online Resource
    ISSN: 0022-3727 , 1361-6463
    URL: Article
    DOI: 10.1088/0022-3727/44/25/255201
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 209221-9
    detail.hit.zdb_id: 1472948-9
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  • 3
    Online Resource
    Online Resource
    Experimental study on liquid metal free surface flow under magnetic and electric field for nuclear fusion
    IOP Publishing ; 2022
    In:  Nuclear Fusion Vol. 62, No. 3 ( 2022-03-01), p. 036029-
    Details
    In: Nuclear Fusion, IOP Publishing, Vol. 62, No. 3 ( 2022-03-01), p. 036029-
    Abstract: In the future application of nuclear fusion, the liquid metal flows are considered to be an attractive option of the first wall of the tokamak which can effectively remove impurities and improve the confinement of plasma. Moreover, the flowing liquid metal can solve the problem of the corrosion of the solid first wall due to high thermal load and particle discharge. In the magnetic confinement fusion reactor, the liquid metal flow experiences strong magnetic and electric, fields from plasma. In the present paper, an experiment has been conducted to explore the influence of electric and magnetic fields on liquid metal flow. The direction of electric current is perpendicular to that of the magnetic field direction, and thus the Lorentz force is upward or downward. A laser profilometer based on the laser triangulation technique is used to measure the thickness of the liquid film of Galinstan. The phenomenon of the liquid column from the free surface is observed by the high-speed camera under various flow rates, intensities of magnetic field and electric field. Under a constant external magnetic field, the liquid column appears at the position of the incident current once the external current exceeds a critical value, which is inversely proportional to the magnetic field. The thickness of the flowing liquid film increases with the intensities of magnetic field, electric field, and Reynolds number. The thickness of the liquid film at the incident current position reaches a maximum value when the force is upward. The distribution of liquid metal in the channel presents a parabolic shape with high central and low marginal. Additionally, the splashing, i.e. the detachment of liquid metal is not observed in the present experiment, which suggests a higher critical current for splashing to occur.
    Type of Medium: Online Resource
    ISSN: 0029-5515 , 1741-4326
    URL: Article
    DOI: 10.1088/1741-4326/ac4b9c
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2037980-8
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  • 4
    Online Resource
    Online Resource
    Fabrication of high-aspect-ratio polydimethylsiloxane microstructures by reducing the interfacial adhesion in soft lithography
    IOP Publishing ; 2021
    In:  Journal of Micromechanics and Microengineering Vol. 31, No. 7 ( 2021-07-01), p. 075004-
    Details
    In: Journal of Micromechanics and Microengineering, IOP Publishing, Vol. 31, No. 7 ( 2021-07-01), p. 075004-
    Abstract: The soft lithographic fabrication of high-aspect-ratio polydimethylsiloxane (PDMS) microstructures is quite challenging because of the strong interfacial adhesion between them and masters during demolding. This paper presents a simple method for fabricating high-aspect-ratio PDMS microstructures by reducing the interfacial adhesion through the cooling process. The effect of cooling process on the topography, elastic property, and adhesion property of Sylgard 184 PDMS is studied. It is found that wrinkles are formed on the surface of PDMS and that the Young’s modulus of PDMS is increased by the air cooling process. Consequently, the air-cooled PDMS has lower adhesion than the traditional oven-cooled PDMS. This result could be explained by the adhesion parameter theory: both the high amplitude of the wrinkles formed on the surface of PDMS and the high Young’s modulus of PDMS increase separation forces and reduce adhesive forces in the interface. Application of this method is demonstrated by fabricating PDMS microchannels from a silicon master which has microstructures with different aspect ratios. Compared with PDMS microchannels obtained by the oven cooling process, PDMS microchannels with a depth of 200 μ m and an aspect ratio of 10 are successfully fabricated by the air cooling process.
    Type of Medium: Online Resource
    ISSN: 0960-1317 , 1361-6439
    URL: Article
    DOI: 10.1088/1361-6439/ac00c8
    RVK:
    ZG 1100
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 1480280-6
    detail.hit.zdb_id: 1069644-1
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