Entanglement of two atoms interacting with a dissipative coherent cavity field without rotating wave approximation

Considering two identical two-level atoms interacting with a single-model dissipative coherent cavity field without rotating wave approximation,we explore the entanglement dynamics of the two atoms prepared in different states using concurrence.Interestingly,our results show that the entanglement between the two atoms that initially disentangled will come up to a large constant rapidly,and then keeps steady in the following time or always has its maximum when prepared in some special Bell states.The model considered in this study is a good candidate for quantum information processing especially for quantum computation as steady high-degree atomic entanglement resource obtained in dissipative cavity.     

核磁共振波谱法测定试剂中残留1H含量

提出了一种核磁共振氢谱外标法快速测定氘代试剂中残留¹H的方法,采用内标法标定氘代氯仿对照品,得到氘代氯仿对照品的氘代率,以此对照品作为外标,测定氘代试剂样品氢谱,通过分析残留¹H积分面积比值计算氘代试剂样品的氘代率。结果表明,氘代氯仿中残留氯仿浓度与其¹H信号积分面积线性关系良好,方法可用于实际样品测定。     

现代核磁共振波谱技术教学实践与人才培养探索

针对目前核磁共振波谱技术教学实践中存在的问题,探讨了核磁共振波谱技术课堂教学、上机实验和创新能力培养的改进措施.希望有助于现代核磁共振波谱技术的普及应用,同时理论与实践相结合的教学模式能够激发学生学习现代核磁共振波谱技术的积极性,并提高其动手能力和科研创新能力,为实现高校创新性人才培养打下基础.     

采用石英玻璃作为离子减薄制样仪离子枪高压绝缘体的应用

针对离子减薄制样仪的离子枪高电压绝缘体（环）污染失效、再生变型等问题，提出了以石英玻璃环替代陶瓷环为绝缘体的方案，设计实施方法并进行实践验证.结果表明：使用高光洁度石英玻璃绝缘体显著提高了抗金属粉尘污染的能力，寿命长且经济耐用，还能经热处理清洁后再生重复使用，大大延长了更换绝缘体的时间，具有重要的应用价值.     

聚焦堆栈中空间几何结构的深度估计

利用聚焦堆栈估计场景深度是计算成像领域中的重要技术手段。提出三维自适应加权全变分计算框架,用于解决场景中弱纹理区域和遮挡区域深度线索丢失导致深度估计不准确的问题。相比传统二维引导滤波方法,所提三维优化框架不仅考虑聚焦堆栈和聚焦测度中共同蕴藏的场景几何结构,避免在深度图中错误地引入场景物理信息,还充分考虑聚焦堆栈和聚焦测度沿图像序列方向的结构特点,实现更高程度的数据保真。模拟数据和实际数据实验结果表明,所提方法能够有效提升聚焦堆栈估计深度的精度。     

石英晶体微天平在手性识别中的应用

石英晶体微天平(QCM)是一类重要的质量型检测器,因具有灵敏度高、分析速度快、检测成本低等优点而具有极好的应用前景,现已广泛应用于环境监测、药物分析、食品质量控制等诸多领域。手性工程的崛起对简单、快速、在线的手性检测技术提出了挑战,QCM手性传感器就是其中一个重要的发展分支。该文简要介绍了QCM的典型实验装置和基本传感原理,详细综述了近年来QCM在手性识别领域的研究进展,包括以环糊精衍生物、分子印迹聚合物、氨基酸衍生物等为手性主体的QCM在手性识别中的应用,并对其今后的发展进行了展望。     

钼金属在离子减薄制样仪样品夹具材料中的应用

针对离子减薄制样仪的样品夹具易污染、变形失效等问题，提出了以钼金属替代普通不锈钢作为夹具材料，结合实践进行验证.结果表明:使用钼金属为夹具材料显著提高了离子枪及其重要部件的寿命，减少了工作舱的污染及样品间的交叉污染，提高了减薄样品的质量及其结构和元素分析的真实性，具有重要的应用价值.     

The periodic death and anabiosis of the entanglement between two moving atoms

This paper investigates the periodic death and anabiosis of the entanglement between two moving atoms interacting with the mode field, and discusses the influences of the atomic motion and the parameter of the mode field. The results show that, the atomic motion leads to the periodic death and anabiosis of the entanglement between two moving atoms, the time of the death and the amplitude of the anabiosis of the entanglement between two moving atoms depend on the initial states of two moving atoms and the parameter of the mode field.     

D-吡喃葡萄糖基异硫氰酸酯柱前衍生化高效液相色谱法分离胺类对映异构体

以2,3,4,6-乙酰基-β-D-吡喃葡萄糖基异硫氰酸酯(GITC)为手性衍生化试剂,对8种氨基酸和2种手性药物进行手性拆分研究。考察了衍生化时间和试剂用量、流动相组成、流动相pH值对分离的影响。结果表明,样品在合适的色谱条件下,能快速达到基线分离。该法用于测定1,2-二胺基环己烷的对映异构体过量(ee)值,得到了满意的结果,方法简易、快速。对某些不对称合成中的胺类化合物的ee值测定及日常生活中氨基酸异构体的分析具有一定的应用价值。     

Entanglement dynamics of a double two-photon Jaynes-Cummings model with Kerr-like medium

In this paper, the entanglement dynamics of a double two-photon Jaynes--Cummings model with Kerr-like medium is investigated. It is shown that initial entanglement has an interesting subsequent time evolution, including the so-called entanglement sudden death effect. It is also shown analytically that the Kerr-like medium can repress entanglement sudden death and enhance the degree of atom--atom entanglement. A more interesting fact is that the Kerr effect is more obvious when each of the two cavities with have the Kerr-like medium than only one of them with the Kerr-like medium.