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介绍了EAST低杂波高压电源保护系统的设计和实现。在EAST装置低杂波电源保护系统中,以主回路过电流﹑管体过电流﹑高压源主回路过电流﹑高压源主回路过电压为主要参数来保护系统正常工作的。在主回路过电流﹑管体过电流时通过撬棒来转移故障电流来保护速调管。 相似文献
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众所周知 ,对一元函数 ,下列命题成立 :若 f ( x)在开区间上可导 ,并在唯一的驻点处取得极值 ,则必在该驻点处取得最值 .但类似的命题对多元函数不成立 .下面试举一反例说明之 .例 函数 f( x,y) =π 1 + x2 - x( y+ siny) + y2 在全平面上有唯一的驻点 ( 0 ,0 ) ,且 f ( 0 ,0 )是极小值 ,但 f ( 0 ,0 )不是 f ( x,y)的最小值 .证 1 .设 φ( y) =y+ siny,易见 φ( y)是严格递增奇函数 .先证明当 | y| <π时 ,φ( y)满足不等式 φ2 + φ′2 <π2 .事实上 ,当 0 0 ,所以偶函… 相似文献
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大豆种子吸胀冷害与“修补”过程的探讨 总被引:5,自引:0,他引:5
本文选用对吸胀冷害敏感的大豆品种吉林3号和黑河3号种子为材料,系统测定种子本身各类电解质及细胞内其他可溶性物质外渗量与吸胀冷害发生的变化。同时运用电子显微镜扫描和组织化学的电子显微镜切片技术,从细胞和亚细胞水平上进行观察比较,并籍助于PEG渗透调控法加以印证。本文报道了上述一系列试验研究的结果,并就种子吸胀冷害的机理问题进行初步的探讨。作者在文中强调指出,要彻底阐明种子吸胀冷害的机理,必须从广义的“修补”角度着眼,即要分别从膜相的物理“修补”和细胞代谢的生理生化“修补”进行探索,更要在两者之间的联系上深入研究。 相似文献
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STUDIES ON THE IMBIBITIONAL CHILLING INJURY AND THE REPARATION OF DAMAGED MEMBRANE SYSTEMS IN SOYBEAN SEEDS 总被引:1,自引:0,他引:1
Two soybean (Glycine max Merrill.) cultivars, Jilin No. 3 and Heihe No. 3 which are sensitive to imbibitional chilling injury were used to investigate the difference between the damaged seeds and control in a series of items, including the leakage of soaking solution (K~+, Na~+, Ca~(++), Mg~(++), Fe~(++) and Zn~(++) various mineral elements, phosphorus, sugars, proteins and more than 10 amino acids, etc.), ATPase activity, the morphological character of the cell wall and the development of organelles. Comparisons between the PEG priming and the chilling injury seeds were also conducted for confirmation.This paper deals with the above experimental results and some mechanisms about the imbibitional chilling injury in seeds are also discussed. The authors stress that investigation of the mechanism of imbibitional chilling injury must be conducted from the points of the reparation in a broad sense, not only limited to the membrane itself, but also including the physical membrane reparation as well as recove 相似文献
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对塔城盆地布格重力异常数据和航磁异常数据进行处理,以地震剖面数据和电性剖面数据为约束条件以降低重磁反演的多解性,求取了塔城盆地石炭系地层的深度,得到了塔城盆地石炭系地层的分布规律,与其它实测资料对比发现,该结果具有一定的正确性. 相似文献
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