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There are some original nonmagnetic point defects in the BaF2 crystallite powder,such as interstitial and vacant F^- which can become paramagnetic centers by γ-ray-irradiation at room temperature,Afterγ-ray irradiation the paramagnetic point defects Vk,H,F and M centers,have been observed in the sample with experiment of electron spin resonance(ESR).Frenkel exciton,a nonmagnetic point defect,can also be induced by the γ-ray irradiation in the sample at room temperature,the existence of the Frenkel exciton is affirmed by an anomalous change of the ESR signal of Vk center with temperature,The signals of the ESR of the H,F and M centers weaken and vanish with the temperature increasing monotonously,But the ESR signal of the Vk enhances when the temperature goes up about 127℃,then weakens and vanishes.An increase in the Vk center follows an annihilation of the Frenkel exciton with heating. 相似文献
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从非均匀磁场对于圆电流作用力的观点,运用矢量方法分析了非均匀磁场中作拉摩旋进的荷电粒子在垂直于磁场方向的漂移运动,得到的结果中包括熟知的由磁场梯度决定的漂移速度,并得出另一个与磁场旋度有关的新的漂移项,其对于分析磁约束中的高温等离子体的漂移不稳定性将有所帮助. 相似文献
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对施用399植物生长剂的小麦特征的电镜观察 总被引:1,自引:1,他引:0
399值物生长剂是一件新型的物理农业技术产品.对使用和不使用399值物生长剂的小麦成熟植株,用环境扫描电镜观察了其根、茎、叶和麦粒部位的结构.通过对照,对该生长剂的功效进行探讨,发现该生长剂能有效的增强细胞光合作用的效率,从而能有效提高小麦的产量. 相似文献
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The structures,grain sizes and magnetism were analyzed and computed for three typical samples:the stock of polycrystalline metal Gd(sample 1),the bulk nanocrystalline Gd prepared by spark plasma sintering(SPS) technique and subjected to the annealing process of 623 K for 0.5 h(sample 2) and the bulk nanocrystalline Gd prepared by the SPS technique at 573 K(sample 3).The computation results indicated that the sample 3 had the efficiency of space filling up to 99.38%.The computation results of magnetization i... 相似文献
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电镜分析399生长剂对香椿等的叶表影响 总被引:4,自引:3,他引:1
物理农业是涉及物理学、农学等多学科的一门交叉和综合的新生学科.399植物生长剂是一种新型的物理农业技术产品.对施用和不施用该生长剂的香椿和蔓菁等,利用环境扫描电镜(ESEM)观察其不同的叶表面结构,对叶表面的不同部位进行化学成分的局部定量分析,结果表明,在施用399植物生长剂后,叶表细胞变得大而饱满,细胞总体积和表面积变大,增大了细胞光合作用的有效面积;叶片表面出现硅富集的亮点,亮点直径为0.1~30μm. 相似文献