排序方式: 共有63条查询结果,搜索用时 46 毫秒
41.
量子纠缠是执行量子计算和构建量子通信网络的关键资源,制备与操控纠缠态光场是实现量子信息处理的基础要素.本文提出了利用双端光学腔倍频产生四组份纠缠态的理论模型,从耦合波方程出发得到Ⅱ类倍频过程的传输矩阵,通过腔内自再现方程和输入输出传输矩阵理论研究了输出的两束倍频光的噪声特性;对于两束倍频光和两束基频泵浦场,利用多组份纠缠光场的充分必要判据PPT方法 (positivity under partial transposition criterion)分析了最小辛本征值与泵浦功率及分析频率之间的关系,研究结果表明基频泵浦光与倍频光之间存在四组份纠缠. 相似文献
43.
这是一道常州市2010—2011学年度高三教学情况调研试题,作为最后一道填空题,难度适中,主要考查函数的零点与方程根的等价转化,求整数解可以通过整除的方法来解决. 相似文献
45.
46.
47.
48.
In the present study, gonadotropin and gonadotropin-releasing hormone (GnRH) regulation of tPA and PAI-1 expression in PMSG-primed granulosa cells has been investigated, (i) Addition of go-nadotropins (FSH and LH) and GnRH agonist (GnRHa) or PMA to the culture increases tPA activity) FSH (or LH) plus GnRHa (or PMA) in the culture further enhances the enzyme production to such an extent that a more obvious effect than the additive effect caused by these hormones used alone has been observed; (ii) in contrast, FSH and LH decrease PAI-1 activity, whereas GnRHa and PMA alone markedly increase PAI-1 mRNA level and PAI-1 activity. Because FSH and LH stimulate tPA production and have no significant effect on PAI-1 mRNA induction, the observed inhibition of PAI-1 activity by gonadotropins may be due to the occurrence of neutralization of PA and PAI-1 proteins in the conditioned media by the formation of complexes between PA and PAI-1 ; (iii) increases in PAI-1 mRNA level and activity by GnRH and PMA are complet 相似文献
49.
50.
目的:研究卡瓦内酯对小鼠抗缺氧能力的影响。方法:耐急性缺氧能力、镇静作用和肌内松驰作用选用小鼠进行观察,红细胞和血红蛋白的分析按常规方法进行。结果:卡瓦内酯级明显提高小鼠耐急性缺氧能力,同时具有镇静和肌肉松驰作用,但未见到红细胞数和血红蛋白含量的增加。结论:卡瓦内酯能提高小鼠耐急性缺氧能力,与红细胞数量和血红蛋白的含量无关。可能的机制是降低了小鼠的耗氧量,从而提高了小鼠的耐急性缺氧的能力。 相似文献