原子核间距对平行电磁场中He2+的回归谱与闭合轨道影响的研究

利用半经典闭合轨道理论和分区自洽迭代方法计算了Rydberg态下在平行电磁场中的回归谱与闭合轨道.通过计算分子中两原子之间的距离在平衡位置、最小以及最大时的闭合轨道和回归谱讨论了分子实散射效应对平行电磁场中的回归谱与闭合轨道的影响.     

基于启发式分割算法检测华北和全球气候变化的特征

全球变化已成为当代科学界瞩目的新领域，气候变化是其研究的核心内容之一，它受到各国政府的极大重视.气候突变是气候变化的重要表现形式之一，目前对气候突变的研究主要针对代用资料，运用传统的统计学方法进行处理，尽管取得了不少进展，但气候系统的非线性、多层次性和非平稳性对分析和检测气候突变的方法提出了较高的要求.众所周知，气候系统可能是由多个不同区域气候子系统构成的复杂体系，因而局地和全球气候变化之间必然存在一定的内在联系，但目前关于这方面研究的理论和方法还较少.介绍了一种适合非线性和非平稳时间序列的突变检测新方法 关键词： 突变 启发式分割算法 人为变率 小冰期 全球变化     

Fundamental studies of the cluster ion bombardment of water ice

The fundamental sputtering properties of water ice are of interest for molecular depth profiling of biological samples in their native environment. We report on a method of studying amorphous water ice films of precise thicknesses in which pure water vapor is condensed onto a pre-cooled, silver-coated quartz crystal microbalance (QCM). This scheme allows for the determination of water ice sputter yields for any primary projectile as well as providing a means for studying escape depths of atoms and molecules beneath the deposited water ice layer. Specifically, we find a removal of approximately 2500 water molecule equivalents/20 keV C₆₀⁺ projectile with an underlying silver ion escape depth of 7.0 Å.     

Prequantale上最大空间式Frame商

Prequantale quotient is defined in terms of prequantic nucleus, some equivalent propositions of which is obtained. Also, prequantale quotient is proved to coincide with the quotient object in PQuant up to isomorphism. At last, the concrete structure of the largest spatial frame quotient in TPQuant is given.     

Weak pion production from nuclei

The charged current pion production induced by neutrinos in¹²C,¹⁶O and⁵⁶Fe nuclei has been studied. The calculations have been done for the coherent as well as the incoherent processes assuming Δ dominance and takes into account the effect of Pauli blocking, Fermi motion and the renormalization of Δ in the nuclear medium. The pion absorption effects have also been taken into account     

T1-weighting of Hahn echo-trains in the stray-field for deuterium: prospects for imaging using long echo-train summation

Hahn-echoes have been observed in stray-field gradients of 37.5 T/m and 74.5 T/m for deuterium in heavy water in a number of forms: liquid, ice, and coordinated in solid copper sulfate and silica gel. In the diamagnetic samples, the application of many pulses (>1000 or more) in long pulse-trains produced many sustained echoes. This lengthening of T_echo is caused by T₁-weighting of the components of the Hahn echo (even in the absence of spin-locking). In contrast, for the paramagnetic complex, the shortening of T₁ greatly reduces T_echo and only few echoes are obtained. A new protocol for stray field imaging is suggested when T₁ is long: long echo-train summation (LETS). The observed magnetisation is much greater for heavy ice than for heavy water because the line-width, and hence the thickness of the excited slice, is greater.     

舌慢适应传入神经终末与三叉神经感觉主核的突触联系

目的：研究舌感觉慢适应传入纤维终止于三叉神经感觉主核形成的突触类型及各类型突触出现的频率，为神经生理学和神经解剖学研究提供参考资料。方法：采用细胞内注射，免疫电镜和连续超薄切片技术。结果：舌感觉传入慢适应纤维投射到三叉神经感觉主核形成的突触类型分单纯型、中间型和复杂型3种，以中间型突触出现率最高。形成突触的各组成部分以轴－树及轴－轴突形形式为主，并有轴－体突轴。结论：中间型突触和轴－树及轴－轴突触是三叉神经感觉主该处理器觉信息的主 要形态学基础。     

Optical spectroscopy of the X-ray sources around the Seyfert galaxy NGC3516—probable evidence for non-standard cosmology

In order to check the nature of the redshifts of the quasars, six X-ray sources around the Seyfert galaxy NGC3516 have been investigated, among which five were observed spectroscopically. The results show that the six sources, S1102 + 7246, S1108 + 7226, Q1106 + 7244, Q1105 + 7242, Q1105 + 7238 and Q1107 + 7232 are active galactic nuclei. Their redshifts are 0.089, 0.328, 0.690, 1.399 and 2.10, respectively. The unique characteristics of these active galactic nuclei seem to support the non-standard cosmology model.     

表面凹腔中气泡核的稳定性分析

系统地分析了气泡核在表面凹腔内的生长和收缩过程，通过对气泡核平衡机理的探讨，获得了修正的稳定性判据，进而研究沸腾起始及空腔钝化的条件．首次讨论了气泡核稳定性曲线的滞后效应，并建立了一种定量分析模式，以分析气泡核的稳定性行为．     

非束缚核11N共振能级研究

简要回顾了目前有关非束缚态核¹¹N的实验研究现状,并根据GANIL和MSU的逆运动学弹性共振散射实验的结果,用多能级R矩阵理论拟合了散射质子的激发函数共振峰. 拟合结果表明,新的¹¹N能级顺序应为:1/2⁺, 1/2^－,5/2⁺,3/2⁺, 3/2^－,5/2⁺,7/2^－,同镜像核¹¹Be的实验测量结果和GCM理论计算¹¹N的能级顺序相一致.