Enhancing magnetic dipole emission with magnetic metamaterials

Magnetic dipole(MD) transitions are important for a range of technologies from quantum light sources and displays to lasers and bio-probes. However, the typical MD transitions are much weaker than their electric counterparts and are usually neglected in practical applications. Herein, we experimentally demonstrate that the MD transitions can be significantly enhanced by the well-developed magnetic metamaterials in the visible optical range. The magnetic metamaterials consist of silver nanostrips and a thick silver film, which are separated with an Eu~(3+):polymethyl methacrylate(PMMA) film. By controlling the thickness of the Eu~(3+):PMMA film, the magnetic resonance has been tuned to match the emission wavelength of MDs. Consequently,the intensity of MD emission has been significantly increased by around 30 times at the magnetic resonance wavelength, whereas the intensity of electric dipole emission is well-preserved. The corresponding numerical calculations reveal that the enhancement is directly generated by the magnetic resonance, which strongly increases the magnetic local density of states around the MD emitter and can efficiently radiate the MD emission into the far field. This is the first demonstration, to the best of our knowledge, that MD transitions can be improved by an additional degree of magnetic freedom, and we believe this research shall pave a new route towards bright magnetic emitters and their potential applications.     

关于矢值解析函数的一点注记

Analytic functions with range included in a Banach subspace are studied and a sufficient condition for analyticity in the subspace is given.     

一种简单的抽提法

一种简单的抽提法王荣民张海涛何玉凤王云普（西北师范大学化学系兰州７３００７０）固体物质的抽提，一般是在所谓的索氏（Ｓｏｘｈｌｏｔ）抽提器中进行的。我们在实验过程中发现使用现成的磨口索氏抽提器有诸多不便：首先，索氏抽提器的成套性不好，这是因为索氏抽提器...     

湿生扁蕾中不同部位3种药用成分的反相高效液相色谱测定

建立了同时测定湿生扁蕾中不同部位3种有效成分即獐牙菜苦苷(S1)、獐牙菜苷(S2)、1,7-二羟基-3,8-二甲氧基口山酮(S3)的反相高效液相色谱定量分析方法,并进一步考察2005扣2006年20批样品中不同部位的S1、S2、S3分布状态.检测波长260 nm,流动相乙腈-0.4%磷酸水溶液,梯度洗脱,洗脱条件为0 min→40 min→55 min;流动相乙腈10%→30%→100%;0.4%H3PO490%→70%→0%,流速1 mL/min,柱温:25℃.S1、S2、S3线性范围分别为2.8～14 μg、12～20.6μg、2.64～13.2μg.回收率分别为99.89%、99.52%、99.42%.该方法具有很好的线性关系和回收率,且不同样品不同部位的S1、S2、S3中含量分布有明显的差异.     

具有正负系数的二阶中立型时滞微分方程的振动性

将研究带有正负系数的的二阶时滞微分方程解的振动性,使用文献中的思想,得到了这类方程振动解存在的充分条件,推广和改进了文献中的相关结论,并且通过具体的例子说明所得结论的优越性.     

基于脉冲串飞秒激光的血凝块消蚀效果研究

脉冲串飞秒激光在工业精密加工中展现出低热高效的特性，有望为血栓清除技术提供新型解决方案。以动物血凝块为消蚀样本，将脉冲串飞秒激光与高速振镜相结合来搭建实验平台，对样本表面进行单层扫描消蚀，使用三维超景深显微镜对消蚀坑进行观察和记录，并与相同平均功率下的传统脉冲模式飞秒激光的消蚀结果进行比较。结果表明，相比于传统脉冲模式，脉冲串飞秒激光可以提升消蚀效率并降低消蚀阈值，具有良好的临床研发潜力。     

注重课堂动态生成，点燃学生思维活力

<正>课堂动态生成是在教学过程中生成的预设以外的教学活动的概括，体现了课堂教学的生动性和可变性，动态生成是对课前预设的补充和完善.在课堂教学中教师根据学生的认知规律和特点，组织学生参与探究活动，激发学生的思维活力，使课堂教学更加精彩纷呈，让课堂教学结构更加符合新课程的理念，促进学生的全面健康发展.1 精心预设，提供精彩生成前提课前预设与课堂生成共同构成了教学的统一体，二者相辅相成，缺一不可.课前精心预设是对教学目标、