To ensure the safety of electrical equipment and staffs in wind power plant, it is necessary to design qualified grounding resistance, touch voltage and step voltage. When the grounding resistance meets the requirement, if the grounding resistance meets the requirement, it may also appear high step voltage and touch voltage on the ground and exceed permissible value. There are two main methods to reduce the step voltage and touch voltage: spreading grounding system and using surface layer. But the natural environment of wind turbines tough, it is not easy to expand the grounding grid. Without increasing the total length of earth mat, the unequal spacing arrangement of grounding conductor, or changing the relative position of the foundation and mat can significantly reduce the surface maximum touch voltage and improve the safety level of grounding net. Placing short vertical grounding rod at the corner of grounding grid can also reduce the maximum touch voltage. The relative position of grounding grid and foundation also affects the touch voltage value. In the fact of this, the author simulates and analyses the wind turbine grounding grid with the CDEGS software, and presents a kind of optimization design of wind turbine grounding grid.

The historical change of production method in Ailaoshan area has a feature of finishing the change in several hundred years which would be in several thousand years in a general social development history,because of the influence by the later feudal and the modern nations.Shacun of Mohaoju is a typical example in Ailaoshan area,and it is closely related to historical and social economy development of Ailaoshan area.To a great degree,the history of Luoluo Yi people in Shacun can reflect and represent the ordinary situation of Ailaoshan area.So,the significance of investigating the social economy development of Shacun is not only to know the economical development history of Yi people but also enriching our knowing of social economy development history and its development law.

At present,in the south-western ethnic minority regions,civil status of endangered cultural survival is still grim,In terms of Chuxiong Yi national minority autonomous prefecture,led by the Government to carry out vigorous rural cultural tourism festivals have become a building of new socialist countryside In Yi district and outstanding features of improving the economic standard of farmers.As a result of a comprehensively rural tourism brand building,Yi traditional culture has being impacted on Stability,integrity and continuity.In this regard,the authors made several field trips,through its participation in the planning for Calabash Sheng Festival as well as preparations and holding for this festival,a full investigation.National traditional festivals of the modern changes have been inevitable.And it is an important issue of concern that traditional festivals in the cultural elements in modern life timely selection,fixed position and heritage.

National hero is the main eulogizing object in mythic epics and folk stories.The Yi people's epic Alujure and Baotou King are the difference two mythic variation editions of Zhigealong in different Yi regions.Three editions come form Liangshan in both sides of Jinshajiang River,Yongren County and Ailaoshan region which nearly have similar frameworks,contents and cultural connotations.In this paper,the authors draw out five cultural characteristics from different editions by the comparative methods.Finally,the authors point out that the important basic rule of folk literature is just its variability.

Large numbers of pedigrees of Yi clan and famous peoples’ pedigrees had been reserved in ancient literatures and nuncupative literatures, which can supply more pedigree material to Chinese pedigrees. These precious cultural inheritances have important historical research value.

The folk law and society appear at the same time.At the beginning of the national society,people cannot live independently because of the limited individual capacity and bad environment.People gather together in the certain group like family or clan,the earliest law appears for adjusting the inner order of the group and the right and responsibility of members.The development of backtracking goes through such an irregular changing process from the trinity of taboo,morality and custom to habit law expanding and mixed as the folk law till a perfect written law.From it,we can see the modern effect and historical heritage of Yi folk law.

The ten month calendar cultural garden of Chinese Yi nationality is the successful paradigm of utilization Yi culture research fruit,also is Chinese excellent culture idiographic extractive masterpiece.Digging up the ten month calendar has being reveal its historical significance.

In Taoism scriptures,calabash is regarded as Hu Tian,a small universe which has sun and moon.According to the funeral tradition,Yi people think man would return to Hu Tianafter he is dead.The reason why Taoism and the belief of Yi people are so similar is that Taoism absorbed the fairy thoughts of those talents in Qin Dynasty.The fairy thoughts originate from western Qiang.Yi people are just the descendants of the ancient Qiang people.The belief of Yi people is the folk custom basis of Taoism.

对于图形符号 ( )的起源,学术界有许多探讨.本文从彝族的具体文化事象出发,深入探讨 ( )的起源及其在彝族世界观和自然科学中的地位和影响,认为彝族吉符 ( )最初发端于具体事物(羊角)及具体的日常生活活动(巫术).字符、或十,在彝族文化中其实就是一对阴阳相交的羊角.这一结论是对" 、”字符从起源到发展、从具象到抽象、从巫术实践到哲学观念、从社会科学知识到自然科学知识作出的系统性概括.