The last chapter comments on the “ chilean model ” . the author agrees on some successful facts in chilean pension reform , espiecally for the high investment return and the positive effects on the development of capital market as well as macro - economy brought forth by pension fund . however , there are still some difficulties and problems unsolved in chilean pension system , such as the low coverage of pension plan , high management cost , pension income gap , the fiscal burden and so on 同时,智利模式面临的问题也是突出的:表现在参保率差,养老金收入分配差距扩大,针对低收入群体的财政支出负担加重以及投资方面存在的成本负担过重、市场监管过度等方面的问题上,这些问题的产生既有私营养老金体制自身的原因,也有经济社会条件变化带来的影响因素。
Meanwhile , the soft - field characteristics of ert systems in different numbers of electrodes are studied , and the main soft - field characteristics of ert systems are found . the results show that the soft - field characteristics are greatly reflected in the influence of distribution of mediums and the difference in conductivity of two - phase mediums on the distributions of the sensitivity field 最后研究了当电极数目不同时对ert软场特性的影响，得出了ert传感器软场特性的规律： ert传感器的“软场”特性主要体现在其灵敏场的分布受被测介质的分布及两相介质电导率差值的影响。
Abstract : in view of the poor stop accuracy , unstability of climbing at reduced or low speed and over - winding of mine ac lift when power braking is used , a siemens all - numerical rectification device is applied in the braking system of mine lift and its control mechanism and method are described 文摘:针对采用动力制动矿井交流提升机停车准确率差，减速与低速爬行不平稳及产生过卷的问题，将西门子全数字整流装置应用到提升机制动控制系统，并介绍了该系统的控制原理与方法。
4 , by making use of micro pore and permeability apparatus and optopn multifunction microscope etc . advanced reservoir testing equipments , the ability to show heterogeneity from micro to macro has been improved largely . k - level / k is more than 1 . 4 in south region reservoir , that is to say , the permeability in section is worse comparing to that of level direction , which is caused mainly by mud layers : different stone facies results in different micro feature , and in the south region , fluvial sandstone has cementation , compaction , corrosion and exchanging diagenesis , which occurred in b stage of early period 4 、应用微孔渗仪和opton多功能显微镜等先进的储层测试仪器设备，大大提高了从宏观到微观表征储层非均质的能力；南区储层中k _ (水平) k _的比值一般大于1 . 4 ，即垂向上渗透率相对于水平渗透率差，这主要是砂岩中泥质纹层造成的；不同岩石相的微观特征不同，南区河道砂储层主要有胶结、压实、溶蚀和交代等成岩作用，成岩阶段属早成岩b期。
