我国建立个人信用体系的问题探讨

完善的市场经济离不开信用经济,我国目前的个人信用经济还不太发达,主要是信用保证缺失,没有完善的个人信用体系。要发展我国的个人信用经济就要打破这个桎梏,学习外国先进经验,结合我们自身的实际,阶段性地建立我国的个人信用体系。     

无线网状网络路由协议在矿山应急通信中的应用研究

无线网状网络(Wireless Mesh Network,WMN)在矿山应急通信系统中的稳定拓扑结构以及高容量高速率的性能给路由协议的设计提出了新的要求,为了得出更适用于矿山应急的WMN路由协议,分类阐述了主动路由协议、按需式路由协议和混合式路由协议三类路由协议,并且从多方面介绍了AODV、AOMDV和HWMP三种常见路由协议的性能并分类综述了常见的改进措施,对于网络利用率问题,借助能量消耗的平衡策略进行改进,对于路由开销大的问题,从优化节点间的移动机制降低节点能耗方面改进,对于链路干扰的问题,从分配节点任务队列和预防网络热点两方面进行改进,结果表明AODV路由协议相较于其他协议更有优越性,最后,从Mesh网络管理和改进链路故障、数据机密性等路由问题展望未来的研究方向。     

Structure and Photoluminescence of a New 3D Cu_4I_4 Hybrid Constructed by a Flexible Acyclic Aliphatic Diamine with Steric Effect

A new 3D copper(I) iodide hybrid, [Cu4I4(TMEDA)2]n(1, TMEDA = N,N,N',N'-tetramethylethylenediamine), has been solvothermally synthesized and characterized by singlecrystal X-ray diffraction, IR spectroscopy, elemental analysis, powder X-ray diffractions and thermogravimetric analysis. Compound 1 crystallizes in tetragonal space group P42/n with a = b = 11.5663(7) A, c = 9.2456(11) A, V = 1236.87(18) A3, Z = 8, C3H8 CuIN, Mr = 248.54, Dc = 3.507 g/cm3, F(000) = 920, μ(MoKα) = 8.388 mm–1, the final R = 0.0244 and wR = 0.0573 for 1118 observed reflections(I 2σ(I)). The hybrid framework is built up from cubane-like Cu4I4 cluster and flexible acyclic aliphatic diamine TMEDA, which can be simplified into a twofold interpenetrating dia network. The solid state luminescence spectrum displays a strong yellow emission band at room temperature(Aex = 340 nm, Aem = 530 nm). Results reveal that steric effect of N-substituted methyl groups in TMEDA have obvious influence on the structure and photoluminescent property of compound 1.     

对我国商业银行引进战略投资者策略的思考

目前,我国商业银行业正处于新一轮的改革当中,这是适应入世之后的新形势以及走出国门的应有之举。各个银行不断出台各种新举措,其中,引进境外战略投资者的做法通常成为媒体和学者们关注的焦点。关于这种策略的优劣现在下定论还为时尚早,但是我们可以结合我国近年来金融行业的发展状况,对这个策略做一个浅显的分析。     

Ultrafast proton transfer dynamics of 2-(2'-hydroxyphenyl)benzoxazole dye in different solvents

The excited-state intramolecular proton transfer of 2-(2-hydroxyphenyl)benzoxazole dye in different solvents is investigated using ultrafast femtosecond transient absorption spectroscopy combined with quantum chemical calculations.Conformational conversion from the syn-enol configuration to the keto configuration is proposed as the mechanism of excited-state intramolecular proton transfer.The duration of excited-state intramolecular proton transfer is measured to range from 50 fs to 200 fs in different solvents.This time is strongly dependent on the calculated energy gap between the N-S;and T-S;structures in the S;state.Along the proton transfer reaction coordinate,the vibrational relaxation process on the S;state potential surface is observed.The duration of the vibrational relaxation process is determined to be from8.7 ps to 35 ps dependent on the excess vibrational energy.     

新形势下对我国货币政策中介目标选择的思考

简述了世界各国货币政策中介目标的选择及演进过程,针对目前我国实行的货币供应量中介目标所面临的问题,结合新形势下的金融现状,探讨了我国货币政策中介目标的重新选择问题。     

带电塑料梳子吸引纸屑的“ 跳变”现象

用头发摩擦过的塑料梳子带有一定量的电荷, 将其靠近细小纸屑, 距离较远时纸屑纹丝不动. 继续移 动梳子, 发现纸屑开始出现略微的颤动. 此时只需将塑料梳子稍作移动, 纸屑便像被施了魔法一样“ 噌”地跳上梳 子, 该过程几乎是在瞬间发生的. 分析得到塑料梳子与纸屑之间吸引力的大小与r 5 成反比, 同两个带电物体之间库 仑力与r 2 成反比相比, 该吸引力更加依赖于二者的距离, 随着距离的减小, 力增加得更快, 因此出现“ 跳变”现象