Multiple ionization of atoms and molecules impacted by very high-q fast projectiles in the strong coupling regime （q/v 〉 1）

In this paper, we present a simple theoretical approach to calculate the multiple ionization of big atoms and molecules induced by very high-q fast projectiles in a strong coupling regime （q/v 〉 1）. The results obtained from this approach are in excellent agreement with the available experimental data. A probable scenario of molecular multiple ionization by fast and very high-q projectiles is discussed. The very small computational time required here and the good agreement with the existing experimental data make it a good candidate for studying the multiple ionization of complex molecules under high linear energy transfers.     

被动式太赫兹图像目标检测研究

研究提出一种被动式太赫兹扫描成像的目标检测方法。用0.22 THz被动式扫描成像系统采集原始图像,在滤波去噪后用针孔像分析法获得太赫兹扫描成像系统的点扩展函数,进而用Lucy-Richardson算法重构图像,通过灰度变换和边缘检测增强图像对比度和目标分辨力。实验结果表明,算法能有效改善被动式太赫兹图像质量,提高成像系统探测隐藏可疑物的能力。     

A new compact structure for a high intensity low-energy heavy-ion accelerator

A new compact accelerating structure named Hybrid RFQ is proposed to accelerate a high-intensity low-energy heavy ion beam in HISCL （High Intensive heavy ion SuperConducting Linear accelerator）, which is an injector of HIAF （Heavy Ion Advanced Research Facility）. It is combined by an alternative series of acceleration gaps and RFQ sections. The proposed structure has a high accelerating ability compared with a conventional RFQ and is more compact than traditional DTLs. A Hybrid RFQ is designed to accelerate 238U34＋ from 0.38 MeV/u to 1.33 MeV/u. The operation frequency is described to be 81.25 MHz at CW （continuous wave） mode. The design beam current is 1.0 mA. The results of beam dynamics and RF simulation of the Hybrid RFQ show that the structure has a good performance at the energy range for ion acceleration. The emittance growth is less than 5% in both directions and the RF power is less than 150 kW. In this paper, the results of beam dynamics and RF simulation of the Hybrid RFQ are presented.     

等离子体辅助纳米涂层的构建及其成骨性能

通过氧等离子体处理,在聚对苯二甲酸乙二酯(PET)表面引入羟基,提高了其表面的亲水性.利用静电吸附等方式在PET材料表面先后载入表没食子儿茶素没食子酸酯(EGCG)、纤维黏连蛋白(Fn)和骨形态发生蛋白-2(rhBMP-2),构建了rhBMP-2/EGCG/Fn有机组装的纳米涂层,改性后的PET表面表现出优异的细胞相容...     

低能电子离化He原子的三重微分截面

在ＢＢＫ理论的基础上，考虑末态波函数中的动量相关效应对三重微分截面（ＴＤＣＳ）的影响，计算了共面双对称几何条件下电子离化Ｈｅ原子的三重微分截面．所得结果与其它理论计算进行比较发现：本文结果与最新绝对测量的实验数据在误差范围内完全符合． 关键词：     

在无标样条件下马拉氧磷的气相色谱分析

马拉氧磷系高效接触性杀虫剂。Shafik等人曾将马拉氧磷水解成二甲基硫代磷酸酯和二甲基磷酸酯,然后用气相色谱法测定。此法虽可在无标样条件下测定,但手续繁多费时,误差也较大,而且样品中如含有马拉硫磷则不能测定。本文直接对工业产品的马拉氧磷样品,用柱前化学反应和热离子检测器鉴定出马拉氧磷色谱峰,利用马拉硫磷测定出马拉氧磷的重     

高电荷态Xe离子与He原子碰撞中的电子转移过程研究

采用位置灵敏探测和飞行时间技术研究了高电荷态Xe离子（q=15，17，19，21，23）与He原子碰撞中双电子转移截面与单电子转移截面比随入射离子电荷态的变化规律.提出一步过程假定，对扩展的经典过垒（ECB）模型进行了修正，利用修正模型计算得到的单、双电子转移绝对截面与Andersson等人和Selberg等人的实验结果很好符合，所得截面比与本实验得到的双电子转移截面与单电子俘获截面比较好符合. 关键词： 离子 原子碰撞 电荷转移 一步过程     

小区间上的五素数平方和定理

设N≡5(mod24)为充分大的正整数,本文在广义Riemann假设下证明了素变数方程N=P21+P22+…+P52有解,这里素数P满足     

Effects of ZrO_2 on the Microstructure of a Mica Glass-ceramic

1 INTRODUCTION Glass-ceramic technology is based on the controlled nucleation and crystallization of glass, and glass-ceramics have several advantages over the conventional powder-processed ceramics. In addition to the easy flexibility of formation in t…     

双重作用机制卟啉靶向给药体系的研究进展

近年来卟啉化学研究的一个新热点是,依据卟啉类化合物在肿瘤细胞优先集聚的特点,将其作为携带剂介导现有抗癌药物,实现靶向给药,同时利用卟啉的光敏性,实现分子内加和增效,合成具有化学杀伤和光动力杀伤双重活性的卟啉-抗癌药物体系。本文主要就双重作用机制卟啉靶向给药体系的研究进展进行综述。