下代

Recently, the valuation of RMB becomes a hot topic in economics both domestically and internationally. This paper discusses about the selection of various currency exchange regimes and their future goals and prospects. The analysis starts from the introduction of the theory of exchange rates and the relevant economic factors that affect exchange rates. The analysis is based on the following theories: the theory of macro-stabilization policy in open economy, the Mundell-Fleming model, originated by Professor Robert A Mundell of the Department of Economics Columbia University, who also founded the theory of the optimum currency areas; another theory is the Trilemma by Paul Krugman. It is concluded that the current stable exchange regime serves as an important guarantee for the fast economic development in China.

面对"人民币是否应该升值"这个国内外经济界讨论的热点，本文从汇率决定理论及影响汇率制度的相关经济因素出发，引用了最优货币区域理论的首创者、美国哥伦比亚大学经济系教授罗伯特·A·蒙代尔的开放条件下宏观稳定政策的理论"蒙代尔—弗莱明模型"以及克鲁格曼的"三元悖论"等理论来探讨人民币汇率制度的选择及未来汇率体制的发展目标和前景，明确了目前稳定的人民币汇率体制是促进我国经济高速发展的重要保证。

In the forth chapter, the convergence problem of three Ishikawa and modified three Ishikawa iterative sequences under uniformly continuousΦ-strongly pseudo-contractive mapping and approximating pseudo-contractive mapping is

第四章主要讨论了三重迭代序列以及修改了的三重迭代序列在一致连续的Φ-强伪压缩映射、渐近伪压缩映象下的收敛问题，给出了其判别准则和结论描述。

The paper describes a new iterative decoding algorithm for the product codes, its feedback method is completed by a linear combination of soft output of encoder and the receipt information is different with the traditional turbo iterative decode. When decoder obtains the soft output matrix built -1 and +1, the complexity can be reduced greatly and the performance can be lost utile by reducing the number of candidate code words and omitting the complicated operation of LLR.

针对乘积码提出一种新的迭代解码算法，该算法的反馈方式有别於Turbo码的传统迭代译码，是通过输出软信息与接收软信息进行线性叠加来实现的，此时子译码器的候选码字个数将大为降低，同时译码输出也无须做复杂的LLR计算，直接映射为由-1，+1组成的软输出矩阵，从而在牺牲较小性能的情况下很大程度地降低了译码复杂度。

Assuming that there is a plural Z and , with the following iterative calculation : Z = Z2 +, because the value of different , after several iteration number Z after the amplitude may tend to infinity. May also maintained sector, Mandebo Lott who is set to make Z maintained sector pool put on the complex plane make the distribution of images, as demonstrated above in the extremely complex structure.

假设有复数Z和μ，用下式迭代计算：Z=Z2＋μ，由于μ的取值不同，经过若干次数迭代以后Z的幅值可能趋向无穷，也可能保持有界，曼德勃罗特集就是那些使Z保持有界的μ的集合，把μ在复平面上的分布作成图像，就像上面演示的那样具有极其复杂的结构。

The results show that in the presence of NaHCO3 as base and DMF-H2O (volume ratio 2∶1) as solvent, the complex could catalyze not only iodobenzene but also non-activated bromobenzene quantitatively at 90 ℃ without the inert gas protection, and furthermore the catalyst could be recovered and reused more than eight times.

结果表明，在没有惰性气体保护的情况下，以NaHCO3作碱，以DMF水溶液(体积比为2∶1)作溶剂，在90 ℃时，该配合物不仅对活性较高的碘代苯能够定量地催化，对未活化的溴代苯也能定量地催化，并且催化剂能够回收再利用8次以上。

The monomer ofbromostyrene was synthesized fromβ-bromobenzene by eliminating hydrogenbromide under sodium hydrate.

溴乙基溴代苯在氢氧化钠的作用下，发生溴化氢脱除反应，得到溴代苯乙烯单体。

On the basis of this, the additionreactions of N-sulfonylimines with α-bromoketone s and α-bromoesters in the presentof zinc powder were carried out.

在此基础上又研究了α-溴代酮和α-溴代酯在金属锌的作用下与磺酰亚胺的加成反应。

Bromododecane was synthesized from n-dodecyl alcohol using byproduct hydrobromic acid from 1-bromoadamantan process as raw material in the presence of the concentrated sulfuric acid.

以生产溴代金刚烷得到的副产品氢溴酸为原料，在浓硫酸存在的条件下与正十二醇进行反应合成1-溴代十二烷。

Four different ionic liquids, BF4, BF and PF6 were investigated, arid PF6 showed the best effect when used as the reaction media, giving the highest yield in the shortest reaction time. Promoted by KF in PF6, N-aryl or N-alkyl monosubstituted sulfonamides could react with various activated halides and unactivated primary halides smoothly. Reactions were performed at 85℃ for 2~10 hours, and thirteen N-alkylation products were obtained with 70%~97% yields. Moreover, the ionic liquid recovered could be reused for three times with no appreciable decrease in yield and reaction rate.

结果表明，以PF6为反应介质时显示出了最好的效果，反应的时间最短，收率最高。N-芳基或N-烷基单取代的磺酰胺和各类不同结构的活化的卤代烃和未活化的一级卤代烃在PF6中KF作用下，85℃反应2~10h，以70%~97%的优良收率得到了13个N-烷基化产物，而且离子液体回收使用3次后效果未降低。

The optimal yield of MAPCs was obtained when mononuclear cells were cultured at a initial plating density of 1 × 10~6 cells / cm~2 and the medium was exchanged to remove the nonadherent cells after 72 hours of inoculation.

结果表明，在低血清条件下，DMEM／F12培养基更适合于脐带血MAPC生长；1×10~6／cm~2是原代培养的适宜接种密度，原代第72小时首次换液为最佳换液时问。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。