Reaction spectroscopy at fragmentation beam energies – recent advances in studies of two-nucleon removal

Final-state-exclusive two-nucleon removal reaction data from fast fragmentation beams can provide a demanding test of the microscopic two-nucleon transition densities calculated from large-basis shell model wave functions. The sensitivity of measured partial cross sections to pairing and other correlations is discussed. It is also suggested that the widths of the momentum distributions of these partial cross sections will exhibit a strong dependence on the final-state of the residue and the projectile structure.     

变厚度圆柱型正交各向异性圆形薄板的非线性非对称弯曲问题

本文首先导出变厚度圆柱型正交各向异性圆形薄板的非线性非对称弯曲的基本方程，利用“两变量法”，引进四个小参数，对厚度线性变化的圆柱型正交各向异性圆形薄板的非线性非对称弯曲问题进行研究，得到了挠度函数W（r，θ）和应力函数F（r，θ）对ε1为N阶及对ε2为M阶的一致有效渐近解．     

A STRASSEN LAW OF THE ITERATED LOGARITHM FOR PROCESSES WITH INDEPENDENT INCREMENTS

Let X = {X(t), t ＞- 0} be a process with independent increments (PII) such that E|X(t)| = 0, Dx(t) ∧= E[X(t)^2 < ∞, limt→∞ Dx(t)/t = 1,and there exists a majoring measure G for the jump △X of X. Under these assumptions, using rather a direct method, a Strassen‘s law of the iterated logarithm (Strassen LIL) is established. As some special cases, the Strassen LIL for homogeneous PII and for partial sum process of i.i.d, random variables are comprised.     

_Λ~6Li超核的基态能量

本文将谐振子乘积态为基的方法推广应用于组分集团自旋非零的系统．用此方法和α＋ｐ＋Λ三集团模型详细研究了Λ６Ｌｉ超核的基态结构特征．计算结果表明，此方法可以较好地适用于组分集团自旋非零的系统．     

双层金属锥形扁壳的非线性热稳定性

本文提出有关双层金属锥形扁壳在均匀温度场作用下的非线性稳定性的一般理论.将双层壳体的基本方程简化为与经典壳体理论相似的形式,通过比拟,以作用于锥形扁壳边界上的均匀分布的相当边界力矩来替换温度效应,采用修正迭代法求解.文中给出了临界跳跃力矩曲线.它对于工程上各种仪表弹性元件的设计具有一定的参考价值.     

Free-radical reactions of methyl trifluoropyruvate with aldehydes

Methyl trifluoropyruvate reacts with aldehydes in the presence of catalytic amounts of benzoyl peroxide at 130–140°C to give β,β,β-trifluoro-α-(methoxycarbonyl)ethyl carboxylates. UV irradiation makes oligomerization of the initial ketoester predominant. Deceased. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1763–1766, September, 1998.     

Efficient estimates of the solutions of perturbed control problems

In this paper, we obtain estimates of the solutions for a sequence of strongly convex extremal problems. As applications of our abstract results, we consider optimal control problems with various types of perturbations. We estimate the solutions of problems with perturbations in the state equation and in the control constraining set. A singularly perturbed problem and a problem with perturbed time delay parameter are studied.     

CRYSTAL STRUCTURE INVESTIGATION OF VANADYL COMPLEXES OF TRIDENTATE LIGAND (Ⅰ)——THE CRYSTAL STRUCTURES OF BIS[(1-(2,4-PENTANE- DIONATO(NITROBENZOYL) HYDRAZONE)-2- ETHOXY)OXOVANADIUM] AND BIS-[(1-(2, 4-PENTANEDIONATO-(3-NITROBENZOYL) HYDRAZONE)-2- METHO

The title complexes were obtained by the reactions of bis(2,4-pentanedionato)oxovanadium VO(Acac)_2 and m-nitrophenylhydrazide m-NO_2PhCONHNH_2 in the media EtOH and MeOH respectively. The compound (Ⅰ) crystallizes in the space group PT with unit cell dimensions a=8.123(2), b=10.409(5), c=10.822(4), α=65.78(3)°, β=85.50(3)°,γ=89.04(3)°. The compound (Ⅱ) crystallizes in the space group P2_1/a with unit cell dimensions a=7.745(2), b=19.164(5), c=10.787(4), β=107.87(2)°. The resuhs of structural analyses show that the two compounds have the same characteristics: the tridentate ligand formed by condensation occupies three of the four equatorial positions of vanadium and the rest equatorial position is occupied by alkoxy group RO~-. As RO~-group also bridges the sixth coordinated position of each vanadium atom, it brings about the formation of the new type binuclear complexes of vanadium.     

带核集分划问题的一个线性1／7近似算法

设有整数集Ｓ＝｛ｒ１，ｒ２；ｐ１，ｐ２，…，ｐｎ｝，这里ｒｉ≥０，ｐｊ＞０（ｉ＝１，２；ｊ＝１，２，…，ｎ），寻找一个Ｓ的最优分划Ｐ＝（Ｓ＊１，Ｓ＊２）使得：（１）ｒｉ属于不同子集，（２）Ｓ＊１与Ｓ＊２中元素总和较大者尽可能地小．这是一个ＮＰ－完备问题，本文给出一个线性时间近似算法，它的近似界为８７．     

瓦斯煤尘爆炸火焰光谱的实验研究

本文概述了瓦斯煤尘爆炸火焰光谱实验研究的重要性,我们在弱爆炸和探测器小视场角的条件下,利用自己研制的多波道仪,在一端开口的Φ200cm×2900cm大型管道里,得到了CH4、空气和煤尘的混合物在不同状态下,特征波长λ等于0.8875、1.000、1.505、2.801和4.346微米(μ)的绝对辐射强度及其有关的变化规律,对结果进行了分析讨论,并与国外实验结果进行了对比,根据测量λ=4.346μ绝对辐射强度和我们选择的黑体辐射模型,获得了爆炸火焰的温度,该项研究不仅在工业中具有重要意义,而且对燃烧和化学动力学的研究也具有参考价值。