~(208)Pb核表面多极振荡对1~ 态M1跃迁影响的问题

本文用生成坐标方法(GCM)探讨了~(208)Pb核表面多极振荡对1~ 态M1跃迁影响的问题。计算结果表明集体性最强的八极振荡态的影响是最主要的。     

A≤208核区的矮共振现象及自旋同位旋偶极振荡

本文采用不同的两体力对Pb²⁰⁸的1^-态及其E1跃迁做了粒子空穴计算,对Hg²⁰⁰、Pt¹⁹⁴、W¹⁸⁴等核,以BCS波函数为基矢也做了同样的计算。计算结果与实验结果在总的趋势上是相符的。此外,计算指出了低l组态的E1跃迁从巨共振的退耦合和低能处的自旋-同位旋振荡以及表明了自旋轨道耦合力对矮共振的影响。     

关于壳模型和生成坐标方法在j~3系统的解

本文分别从克模型和生成坐标方法(GGM)出发给出了j~3体系的解,GCM在同时考虑了所有可能的费米子和玻色子收缩后能够得出与壳模型完全一致的严格解。因此有理由预期在处理核内玻色和费米自由度之间的耦合时,GGM是一种有效的微观方法。     

氮气氛中高温退火对ZnO薄膜发光性质的影响

以二乙基锌和水汽分别作为锌源和氧源,用LP-MOCVD方法在p型Si(100)衬底上生长了单一取向的ZnO薄膜。对得到的样品在氮气气氛中进行高温热处理,退火温度分别为900,1000,1100℃。利用室温PL谱、XRD、AFM、XPS等方法对样品的性质进行了研究。研究表明:(1)随着退火温度的升高,样品的结晶性质也逐渐提高,从表面形貌观察到晶粒尺寸逐渐增大;(2)当退火温度从900℃升高至1000℃时,样品的光致发光谱中可见光波段的发光强度有所减弱,而紫外波段的发光强度明显增强;当退火温度升高至1100℃时,可见光波段的发光几乎完全被抑制,而紫外波段的发光强度急剧增强。分析认为,高温退火改善晶体结晶质量的同时调制了样品的Zn/O比,氮气气氛下的热处理使得样品内的氧原子逸出,来自受主缺陷OZn的可见发射随温度升高逐渐减弱,而当退火温度达到1000℃以上时样品成为富锌状态,此时与施主缺陷Zni有关的紫外发射急剧增强。     

奥扎格雷对蘑菇酪氨酸酶的抑制动力学

抗血小板凝聚药奥扎格雷不仅抑制酪氨酸酶单酚酶活性,而且对二酚酶具有很强抑制。导致单酚酶活力和二酚酶活力下降50%的奥扎格雷浓度(IC50)分别为1.35mmol/L和3.45mmol/L。奥扎格雷对单酚酶的抑制效应主要表现于酶催化反应的延滞时间有明显的延长。奥扎格雷对二酚酶的抑制作用表现为可逆的竞争性和非竞争性混合型抑制。     

Effect of Zn Interstitials on Enhancing Ultraviolet Emission of ZnO Films Deposited by MOCVD

ZnO films are grown on Si （111） substrates by a metal organic chemical vapor deposition method. Samples with different stoichiometric composition of Zn and 0 are obtained by varying Ⅱ/Ⅵ molar ratio between 3 and 1/3 in precursors. The x-ray photoelectron spectroscopy and photoluminescenee results show that the ultraviolet emission enhances with the increasing Zn/O composition ratio of the samples. It is suggested that the supertfluous Zn atoms pile up at interstitial positions to form Zn interstitial defects. The radiated recombination of the coupling of free exeitons with donor Zn interstitial enhances the ultraviolet emission of the samples.     

Design and Application of a Near Field Microwave Antenna for the Spin Control of Nitrogen-Vacancy Centers

Controlled manipulation of the electron spin by means of a microwave field is investigated. The near magnetic field generated by a copper wire antenna is measured experimentally and simulated theoretically, and the optimum antenna length and position are obtained. By measuring the change in the fluorescence of nitrogen-vacancy （N-V） centers in diamond after excitation with a 532 nm continuous wave laser at room temperature, it is verified that the spin of the N-V center can be effectively controlled by the microwave field.     

虚拟社区价值共创中的顾客创新动机及行为研究

基于虚拟社区价值共创和顾客创新和动机理论的相关文献,对虚拟社区中的顾客创新动机进行了划分,探讨了虚拟社区互动特征与顾客创新动机及顾客创新意愿间关系,并通过问卷调查法收集相关数据对假设进行了实证检验.结果表明虚拟社区感正向影响顾客创新动机,服务主导逻辑导向只影响经济利益动机、沉浸动机和利他动机.内部动机更多地影响顾客创新投入意愿而外部动机则主要影响顾客的知识分享意愿.研究结论解释了内部动机与外部动机在虚拟社区顾客创新中的不同作用,并对提高虚拟社区中的顾客创新提出了相关建议.     

Stochastic Simulation of Turing Patterns

We investigate the effects of intrinsic noise on Turing pattern formation near the onset of bifurcation from the homogeneous state to Turing pattern in the reaction-diffusion Brusselator. By performing stochastic simulations of the master equation and using Gillespie＇s algorithm, we check the spatiotemporal behaviour influenced by internal noises. We demonstrate that the patterns of occurrence frequency for the reaction and diffusion pro- cesses are also spatially ordered and temporally stable. Turing patterns are found to be robust against intrinsic fluctuations. Sfochastic simulations also reveal that under the influence of intrinsic noises, the onset of Turing instability is advanced in comparison to that predicted deterministically.     

由多边形小孔的远场衍射解释灯光的星芒

用光的衍射理论证实了相机感光元件记录的图样为光圈的远场衍射图样,揭示了灯光星芒的成因.由数值计算可得:当多边形衍射孔的边数n为奇数时,星芒有2n条;n为偶数时,星芒有n条.若光圈的边为直线,则衍射图样为光刺;若光圈的边为圆弧,则衍射图样为光柱.实验观察了正三、四、五、六、八边形孔的远场衍射图样,并对比了正六边形孔衍射条纹到中心的距离、各级衍射条纹的相对亮度的实验和理论结果,两者符合说明了理论分析的正确性和数值算法的有效性.