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...     

800 V行波管研究

提出了一种角度对数周期微带曲折线慢波结构,该结构具有微带型慢波结构尺寸小、易加工的特点,同时特殊的结构使得它可以工作在极低的电压下,可用于低工作电压、宽频带毫米波径向束行波管。给出了这种慢波结构在Ka波段的色散特性和传输特性,并进行了注波互作用的分析。计算结果表明:该新型慢波结构的工作电压可低至809 V,输出功率26 W,3 dB带宽约为19 GHz (27~46 GHz),虽然单个角度对数周期微带曲折线慢波结构的输出功率较小,但是这种结构通过功率合成,可以达到数百W的功率输出。     

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.     

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.     

Interband Optical Transitions due to Donor Bound Excitons in Wurtzite InGaN Strained Coupled Quantum Dots： Strong Built-in Electric Field Effects

Considering the three-dimensional confinement of the electrons and holes and the strong built-in electric field （BEF） in the wurtzite InGaN strained coupled quantum dots （QDs）, the positively charged donor bound exciton states and interband optical transitions are investigated theoretically by means of a variational method. Our calculations indicate that the emission wavelengths sensitively depend on the donor position, the strong BEF, and the structure parameters of the QD system.     

高电荷态Arq+与Ne碰撞中入射离子电荷交换截面的研究

报道Arq++Ne(q=8, 9, 11, 12)碰撞体系中多电子转移过程,得到了多组实验测量电荷交换截面数据,讨论入射离子电荷交换截面、反冲离子产生截面与入射离子电荷态、能量以及散射离子电荷态的关系,并且将实验结果与Arq++Ar碰撞体系进行对比研究.在修正分子库仑过垒模型的基础上,对实验现象做了合理的解释.     

高电荷态离子Ar17+与Mo表面作用过程中的X射线发射

观测了低速(小于Bohr速度)高电荷Ar¹⁷⁺离子与金属Mo表面相互作用的X射线发射,以及ArKα,KβX射线强度随入射离子动能的变化.     

非晶和纳米ZrO2,ZrO2:Y发光研究

利用共沉淀法制备了非晶和纳米ZrO2和ZrO2:Y(7%)。通过X射线衍射对其晶化过程的结构变化进行了表征，并在不同温度和气氛下进行处理，研究了对其发光性质的影响。结果表明发射谱由一个Gaussian带（峰值2．69eV)和一个非对称带（峰值3.12eV）构成，它们对应的发光中心分别为F^ 心和（F－F）^ 心。非晶样品的发光强度比纳米晶样品强，发光强度主要受氧空位的浓度和晶粒尺寸的影响，随着处理温度的升高，两者竞争的结果综合地影响了发光强度。     

非晶和纳米ZrO_2,ZrO_2∶Y发光研究

利用共沉淀法制备了非晶和纳米ZrO2 和ZrO2 ∶Y(7% )。通过X射线衍射对其晶化过程的结构变化进行了表征 ,并在不同温度和气氛下进行处理 ,研究了对其发光性质的影响。结果表明发射谱由一个Gaus sian带 (峰值 2 6 9eV)和一个非对称带 (峰值 3 12eV)构成 ,它们对应的发光中心分别为F+ 心和 (F F) + 心。非晶样品的发光强度比纳米晶样品强 ,发光强度主要受氧空位的浓度和晶粒尺寸的影响 ,随着处理温度的升高 ,两者竞争的结果综合地影响了发光强度     

近玻尔速度氙离子激发钒的K壳层X射线

测量了2.4—6.0 MeV Xe~(20+)离子轰击V靶表面过程中辐射的X射线.计算了V的K壳层X射线发射截面,并将实验结果与平面波恩近似、ECPSSR、两体碰撞近似的理论计算进行了对比.讨论了近玻尔速度非对称碰撞过程中,BEA模型估算高电荷态重离子激发内壳层电离的修正因素.结果表明,综合考虑库仑偏转和有效电荷态修正后,BEA理论与实验结果符合较好.