Soil erosion by wind, as a natural disaster haunts on dry lands, not only degrades soil productivity but also often results in dust blizzard weather. It may cause pollutions of air and water, damages of highway and railway, wear and tear of buildings and machinery and harmfulness in health of people and animals. Therefore, to combat wind erosion means improving the environment for people to live and work, means heightening the living standard of the local people, and means promoting productive forces. But China has a vast land where probably occur wind erosion disasters, the arid, semiarid and subhumid areas of the temperate zone all are potentially hit by wind erosion. To control wind erosion in China is a very arduous task. More difficult is to achieve recognizable effectiveness with lowest cost.

中文題名寧夏土壤風(fēng)蝕研究副題名外文題名 Estimation of wind erosion in Ningxia 論文作者李玉寶導(dǎo)師王禮先孫保平教授學(xué)科專業(yè)水土保持與荒漠化防治研究領(lǐng)域\研究方向荒漠化防治學(xué)位級別博士學(xué)位授予單位北京林業(yè)大學(xué)學(xué)位授予日期2001 論文頁碼總數(shù)100頁關(guān)鍵詞風(fēng)蝕土壤風(fēng)蝕土壤侵蝕館藏號BSLW /2003 /S157 /14 中國發(fā)生土壤風(fēng)蝕的潛在區(qū)域包括溫帶干旱、亞干旱和亞濕潤氣候下的廣大地區(qū)国产精品无码无套在线，如何有效地預(yù)防和治理土壤風(fēng)蝕亚洲欧美丝袜精品，如何以最小的代價達(dá)到滿意的防治效果，這是很值得研究的問題黄色的视频在线免费看在。

The wind fields andtemperature fields data provided by "D files" from 14 surface observationstations around Beijing area are used to produce the mean wind fields and the meantemperature fields over Beijing area in summer and winter. Such results are gotten:(1)Due to the unique topography the wind of Beijing area during the day time is southernanabatic wind and in the night is northern katabatic wind in summer.

Keywords：wind field； temperature field美女色又黄毛片在线看； urban heat island性色在线观看视频免费网站； urban boundarylayer； Beijing area 北京區(qū)域夏冬季風(fēng)場huangse视频在线免费看、溫度場的觀測研究胡小明劉樹華梁福明王建華劉和平王迎春李炬摘要：用北京及市郊地區(qū)共14個地面氣象觀測站的全月數(shù)據(jù)順序文件&D文件&提供的風(fēng)場及溫度資料超碰日韩精品在线看，采用逐時月均勻的方法對北京及周邊地區(qū)的冬夏兩季的風(fēng)場，溫度場特征進(jìn)行了研究。

This is put into operation the first generation of commercial proliferation of enhanced wind turbine (DAWT: diffuser augmented wind turbine), if the developers to achieve the expected results, will lead to significant reduction in the cost of wind power.

這是投入運行的第一代商用擴散體增強型風(fēng)力機(DAWT： diffuser augmented wind turbine)免费大黄片，如果開發(fā)者的預(yù)期結(jié)果得以實現(xiàn)98极品少妇精品视频，將導(dǎo)致風(fēng)力發(fā)電成本大幅度降低。

trade wind inversion：信風(fēng)逆溫 trade-wind zone 信風(fēng)帶

trade-wind equatorial trough 信風(fēng)赤道槽 | trade-wind inversion 信風(fēng)逆溫 trade-wind zone 信風(fēng)帶 | traditional approximation 慣用近似

風(fēng)摩擦 wind gap 風(fēng)隙：wind friction

wind force scale 風(fēng)級 | wind friction 風(fēng)摩擦 wind gap 風(fēng)隙 | wind power plant 風(fēng)力發(fā)電廠

fair wind;free wind;leading wind;tail wind：順風(fēng)

順潮/fair tide | 順風(fēng)/fair wind;free wind;leading wind;tail wind | 順境/easy street