有机稀土铕的螯合物的发光和能量传递的研究

本文应用荧光光谱和瞬时时间分辨光谱研究了稀土铕有机螯合物,以及在二苯酮做为三线态敏化剂存在时,对能量的吸收、传递和发光的过程,探讨了有机配位体与稀土离子的能级、三线态敏化剂和配位体分子的性质对发光的影响。     

线性规划问题分类解析

“线性规划”是高中数学新教材中增加的内容,是新教材中应用性最广的内容之一,线性规划在生产生活实际中经常用到,是应用题的一个新类型;同时,线性规划又是数形结合思想的集中体现.因此.线性规划问题成为近几年高考的又一热点问题,已愈来愈引起人们的重视。下面,笔者结合近三年的全国高考试题和有关省市的高考、模拟试题对线性规划问题的有关类型问题进行分类解析,以供大家参考。     

多重交汇界面捕捉的LS方法改进

在普通的LS方法基础上，给出一种捕捉可压缩流体多重交汇界面的改进型LS方法，基本思想是在每一个时间循环步，保持LS函数始终为距离函数的基础上对LS函数进行修正，在多重交汇界面以外的区域，修正不改变界面位置，而只是减小多重交汇界面之间因摸平产生的空穴区域。其中，LS方程组和流体动力学方程组均运用非维数分裂的二阶精度有限体积差分格式计算，界面的重新初始化采用五阶WENO格式计算。     

小企业大未来

经历全球金融危机的洗礼之后,整个亚洲的中小企业正处于迅速恢复之中。这体现了中小企业的非凡弹性和适应性。对于比以往任何时候都更加依赖这些充满活力的企业,来实现繁荣发展的亚洲国家来说,这也是振奋人心的好消息。     

A new heuristics model of simulating pedestrian dynamics based on Voronoi diagram

A new heuristics model based on the Voronoi diagram is presented to simulate pedestrian dynamics with the noncrowded state, in which these mechanisms of preference demand evading and surpassing, microscopic anti-deadlock, and site-fine-tuning are considered. The preference demand describes the willingness determination of detouring or following other pedestrians. In the evading and surpassing mechanisms, in order to achieve a balance between avoiding conflicts and minimizing detour distances, a new pair of concepts: "allow-areas and denial-areas" are introduced to divide the feasible region for pedestrians detour behaviors, in which the direction and magnitude of detour velocity are determined.A microscopic anti-deadlock mechanism is inserted to avoid deadlock problem of the counter-directional pedestrian. A site-fine-tuning mechanism is introduced to describe the behavior of avoiding getting too close to the neighbors in pedestrian movement. The presented model is verified through multiple scenarios, including the uni-or bi-direction pedestrian flow in the corridor without obstacles, the uni-direction pedestrian flow in the corridor with obstacles, and the pedestrian evacuation from a room with single-exit. The simulation results show that the velocity–density relationship is consistent with empirical data. Some self-organizing phenomena, such as lanes formation and arching are observed in the simulation.When pedestrians detour an obstacle, the avoiding area before the obstacle and the unoccupied area after the obstacle can be observed. When pedestrians evacuate through a bottleneck without panic, the fan-shaped crowd can be found, which is consistent with the actual observation. It is also found that the behavior of following others in an orderly manner is more conducive to the improvement of the overall movement efficiency when the crowd moves in a limited space.     

Direct Observation of High-Temperature Superconductivity in One-Unit-Cell FeSe Films

We prepared one-unit-ceil （1-UC） thick FeSe films on insulating SrTiOa substrates with non-superconducting FeTe protection layers by molecular beam epitaxy for ex situ studies. By direct transport and magnetic measurements, we provide definitive evidence for high temperature superconductivity in the 1-UC FeSe films with an onset Tc above 40 K and an extremely large critical current density fie Jc-1.7× 106 A/cm2 at 2K, which are much higher than Tc-8K and Jc-104 A/cm^2 for bulk FeSe, respectively. Our work may pave the way to enhancing and tailoring superconductivity by interface engineering.     

Solitary Wave Solutions of Triple Sine-Gordon Equation

Through a mapping relation between the triple sine-Gordon and Ф5 model, we discuss the equation in detail. A series of solitary wave solutions for the triple sine-Gordon equation is obtained by the existing ones of the Ф5 model. Some detailed solitary wave solutions are given for some special coefficients which have significance in physics.     

WHITEHEAD GROUPS OF MODULE EXTENSIONS

When R satisfies (strong unit) 1-stable range and M is a R-R-bimodule, theauthors calculate that K1(R ∞ M) ≌ U(R ∞ M)/L(R ∞ M). As applications, the authors also calculate some Whitehead groups for exchange rings with artinian primitive factors.Key words Whitehead group, module extension, (strong unit) 1-stable range     

建筑涂料用苯丙乳液的研制

本文采用自由基乳液聚合方法，通过苯乙烯，丙烯酸丁酯和丙烯酸三元共聚反应，合成了建筑涂料用的苯丙乳液。通过大量的实验确定了反应配方及加料方式，并详细讨论了各组分及反应条件对聚合反应和产品性能的影响。     

H2D库仑爆炸中的同位素效应与尾流效应

对H2D+通过碳膜后的产物H+和D+的获取与测量,研究了H2D+的同位素效应以及离子穿过固体的尾流效应.H2D+的化学结构得到测定.H2D+的非对称结构得到确认.测量结果与通过其它方式对H2D+的研究结果相一致.