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In order to advance the research on suppressing tearing modes and driving plasma rotation, a DC power supply (PS) system has been developed for dynamic resonant magnetic perturbation (DRMP) coils and applied in the J-TEXT experiment. To enrich experimental phe- nomena in the J-TEXT tokamak, applying the circulating current four-quadrant operation mode in the DRMP DC PS system is proposed. By using the circulating current four-quadrant oper- ation, DRMP coils can be smoothly controlled without the dead-time when the current polarity reverses. Essential circuit analysis, control optimization and simulation of desired scenarios have been performed for normal current. Relevant simulation and test results are also presented. 相似文献
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The resonant magnetic perturbation(RMP) system is a powerful auxiliary system on tokamaks.On the J-TEXT tokamak, a set of new in-vessel coils is designed to enhance the amplitude of the RMP. The new coils are designed to be two-turn saddle coils. These two-turn saddle coils have been optimized in terms of their structure, support, and protection components to overcome the limitations of the narrow in-vessel space, resulting in a compact coil module that can be accommodated in the vessel. To veri... 相似文献
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利用XRD、SEM对光催化颗粒材料进行结构表征,并通过絮凝-颗粒材料光催化氧化法对造纸废水进行处理,研究表明:当硫酸铝投加量为8 g/L,pH值6.5~8.5,颗粒材料用量0.12 g/mL,流经2个反应柱,光照共4 h后,COD去除率和脱色率均可达90%以上,处理后的水符合国家造纸工业水污染物排放标准(GB3544—2001)的一级标准。 相似文献
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平面电磁波入射到吸波结构(如频率选择性表面)上时,吸波结构中能与电磁波电场和磁场分量作用的部分可被等效为电感或电容.但由于平面电磁波在传播方向(坡印廷矢量方向)并无电场和磁场分量,使得坡印廷矢量方向电容很难找到等效的物理器件实现.针对这一问题,设计了一种可以产生平行于坡印廷矢量方向的衍生电场的等效器件,从而在空间中形成平行于(而不是垂直于)坡印廷矢量方向的电容.利用等效电路法求所设计器件的等效电路,并对两者全波仿真.仿真结果表明:在0~1 GHz频段内两者的S参数基本吻合,即所设计的器件可以作为平行于坡印廷矢量方向的电容的等效器件. 相似文献
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简单介绍了曲线梁桥的特点。结合某匝道桥设计,采用有限元实体单元进行初步设计计算,列出了恒载、汽车活载、温度梯度、整体温差以及支座沉降内力组合下,各荷载及其组合对支座反力和弯矩的影响。根据计算结果,分析了产生梁端内侧支座脱空和梁体发生横向爬移的原因。给出了采取预偏心和墩梁固结优化设计后的支座反力和弯矩,2项措施能有效解决曲线梁支座脱空情况。以空间梁单元的方法对实体单元计算结果进行校核,结果显示计算可靠。 相似文献