大孔树脂对高良姜茎叶总黄酮的吸附动力学研究

以高良姜茎叶为原料,采用乙醇提取其总黄酮,通过静态吸附和解吸实验探讨8种大孔树脂对高良姜茎叶总黄酮的吸附效果,并选取最佳树脂研究其对高良姜茎叶总黄酮的吸附等温线、吸附热力学和动力学特征。结果表明,AB-8树脂对高良姜茎叶总黄酮的吸附效果最好;吸附热力学参数表明,吸附焓变?H0,吸附自由能变?G0,熵变?S0,说明其吸附过程为自发放热的物理吸附,吸附量随温度的升高而降低,吸附等温线符合Langmuir模型;3种常用动力学模型的拟合结果以准二级速率方程的R2 (0.9996)最大,能较好地描述AB-8树脂对高良姜茎叶总黄酮的吸附行为,吸附速率受到薄膜扩散和颗粒内扩散的影响,其中薄膜扩散为主要的速率控制步骤。     

长柱形CsI(Tl)闪烁晶体探测器的能量重建

提出了用于TEXONO实验中双端读出的长柱形CsI(Tl)闪烁晶体探测器的两种粒子能量重建方法———“算术平均值能量重建法”和“几何平均值能量重建法”,讨论了两种算法的理论依据和计算方法,并对两种算法进行了比较     

Preparation of Genuinely Entangled Six-Atom State via Cavity Quantum Electrodynamics

A cavity quantum electrodynamics scheme for preparing a genuinely entangled state [A. Borras, et al., J. Phys. A 40 (2007) 13407] on six two-level atoms is proposed. In the scheme, the atom-cavity detuning is much bigger than the atom-cavity coupling strength and the necessary preparation time is much shorter than the Rydberg-atom lifespan. Hence the scheme has two distinct features, i.e., insensitive to the cavity decay and the atom radiation.     

基于相关向量机的多类蛋白质折叠识别

蛋白质折叠的识别是一种不依赖于序列相似性的蛋白质结构研究方法.本文将相关向量机应用于蛋白质折叠的识别,将两类相关向量机推广到多分类情况,对多类蛋白质折叠进行识别.与支持向量机相比较,相关向量机无需调整多余的参数,核函数不需要满足mercer条件,实际数据集上的测试结果表明,相关向量机可以得到更加稀疏的模型,在交叉检验中获得了更高的精度,表明相关向量机是一种有效的识别蛋白质折叠的方法.     

弹球游戏与杨辉三角

在游艺场,笔者和学生看到如图1的弹球游戏,小球●向容器内跌落,碰到第一层阻挡物○后等可能地向两侧跌落碰到第二层阻挡物,再等可能地向其两侧第三层跌落,如此,一直下跌,最终小球●落入底层.根据具体区域获得相应奖品,学生好奇地问为什么A区奖品价值远高于D区奖品?转化成数学问题,就是求小球●落入A区和D区的概率.     

对腔外原子操作时腔内原子的发射性质

考虑初始处于W态的三个双能级原子，将其中两个分别注入处于真空态的两个腔中，发生共振相互作用。通过对腔外原子进行适当的旋转及测量，可使腔场发射双模压缩光，并且当旋转角度发生变化时，压缩的程度也会发生变化。     

Splitting Unknown Qutrit or Ququart States via Two-Qubit Partially Entangled States Channel

In this paper we propose two quantum information splitting (QIS) schemes respectively for splitting an unknown single-qutrit and single-ququart state via three pairs of two-qubit partially entangled state. The necessary measurements and operations are given detailedly and the success probabilities are worked out. The two schemes can be directly generalized to QIS of multi-qutrit and multi-ququart states by using Bell-states channel.     

从一道课本例题对水仙花数的探究

新教材高二数学第一学期(上海教育出版社)第十章算法初步例8是这样的:设(abc)表示百位、十位、个位分别为a,b,c的三位数,试设计算法,求所有满足等式(abc)=a3+b3+c3的三位数(abc).这道关于"水仙花数"的例题体现了新教材的人文时代特征.     

Two Approaches for Indirect Teleportation with Partially Entangled States

Teleportation of a qubit with two partially entangled qubit states linking three nodes as quantum channels is extensively studied via the usual ancilla method. With the method two realization approaches, i.e., the node progression approach and the global accumulation approach, are presented. Their resource consumptions, operation complexities, and el~ciencies axe evaluated and compared. It is found that the latter approach is better than the former one besides the error is partially self-corrected. The latter approach is further improved so that two merits are resultant. The improved version is compared with a similar protocol [M.Y. Wang and F.L. Yah, Eur. Phys. J. D 54 （2009） 111]. Their merits and additional costs are exposed.     

L-Shell Ionization Cross Section Measurements of Dysprosium and Samarium by Low-Energy Electron Impact

The Lα, Lβ and Lγ x-ray production cross sections of Dy and Sm by electron impact are measured at energies from near threshold to tens of keV. In the experiments, thin targets with thick substrates are used. Meanwhile, the electron transport bipartition model is used to eliminate the influence of electrons reflected from the thick substrates on measurements. The measured x-ray production cross sections are also compared with the theoretical predictions by Gryzinski and McGuire.