The results are listed as following :㏕he best anti-erosion proportion of resin present is 25wt% in the condition of silicon carbide reinforced SMCC, while the alumina reinforced SMCC is 40wt%.(2) The better anti-erosion results was achieved with the ratio of silicone resin to acrylic resin containing hydroxy being 3: 1.㏕he composites coating tends to be more brittle when added in alundum particles. It also means that the maximum erosion peak of alundum reinforced SMCC tends to normal angle.甌he change of erosion rate of SMCC can be divided into two stages with the increment erodent velocity: the slow erosion stage of the beginning and the stable erosion stage.

首次發(fā)現(xiàn)：①SiC增強的復(fù)合涂料涂層黄网免费观看在线网站，樹脂含量為25wt％時h欧美精品小视频，具有最佳耐沖蝕性能：Al_2O_3增強的復(fù)合涂料涂層免费黄片的洗澡，樹脂含量為40wt％時在线精品国产女，具有最佳耐沖蝕性能美女高潮多人操；②SiC增強的涂料2021亚洲精品自拍视频，有機硅樹脂與丙烯酸樹脂的比例為3：1時的耐沖蝕性能好于1：1的復(fù)合涂料涂層；③Al_2O_3增強體使涂層變脆的傾向大于以SiC為增強體的涂層91精品欧一区二区三区综合，即SiC增強的復(fù)合涂料涂層的最大沖蝕率出現(xiàn)在30°人人舔人人干人人操，Al_2O_3增強的復(fù)合涂料涂層的最大沖蝕率出現(xiàn)在75°～90°之間午夜激情亚洲专区；④低速沖蝕磨損機理主要是彈性變形與疲勞；高速沖蝕磨損機理主要是顯微切削和顯微犁耕玖玖爱在线视频精品日韩。

This case are same to light, moderate arid severe erosion type, which turn out to be a curve similar to Gaussian distribution, but soil erosion types at the two sides of the curve are totally different, in the left side of the curve, soil erosion are dominated by moderate and severe erosion type, arid in the right side of the curve, mainly soil erosion type is light erosion.

這種情況對于輕度肏逼免费视频、中度及強度土壤侵蝕的影響是類似的，都呈類正態(tài)分布的曲線形式理伦无码在线观看，但在曲線的兩側(cè)土壤侵蝕類型是有本質(zhì)區(qū)別的黄色一及亚洲，在曲線的左側(cè)土壤侵蝕類型的分布是中度和強度為主，而在曲線右側(cè)則以輕度為主欧美三级片免费久久。

The results indicate that, in either single or double blowing, larger erosion rate is mainly found in the slag line and near purging plug area of ladle lining; erosion is accelerated when gas flow rate increases; the erosion rate of ladle lining with double blowing is larger than that of single blowing; erosion rate distribution is obviously different as gas flow rate increases; in heavy blowing, serious erosion centers around slag line area and expands gradually outwards; as purging plug gets close to lining wall, malconformation of erosion rate in ladle lining becomes more prominent and the erosion rate of lining near purging plug increases.

結(jié)果表明日本三级性爱视频，無論單吹還是復(fù)吹，較大的蝕損速率主要分布在鋼包渣線及近透氣磚區(qū)域欧美日韩精品一区二区性色av，吹氣量的增大會加速鋼包內(nèi)襯的蝕損人人操人人摸2018。采用復(fù)吹時，鋼包內(nèi)襯的蝕損較單吹時更快欧美色精品视频在线观看9。隨著吹氣參數(shù)的改變免费的精油按摩毛片，鋼包內(nèi)襯蝕損速率的分布狀況差異明顯。大吹氣量下天天操天天拍，較大的蝕損集中在渣線區(qū)域且呈環(huán)向擴展毛片在线视频网站；透氣磚安裝距包壁越近，鋼包內(nèi)襯蝕損不均衡性也越突出欧美三级片手机在线看，近透氣磚內(nèi)襯蝕損加重可以直接看的av网址站。

The major findings of this research can be summarized as follow:1 The comparison of USPED model-estimated amounts of soil erosion based on four different scales of DEMs (1:250,000, 1:50,000, 1:10,000, and 1:5,000) indicates that 1:50,000 -scale DEM is almost as good as higher-resolution DEM data in providing needed topographic information for assessing soil erosion, whereas 1:250,000-scale DEM underestimates soil erosion mainly because rill erosion and sheet erosion are greatly underestimated.2 Since precipitation is the most important forcing factor for soil erosion, the accuracy of soil-erosion estimates understandably relies on the adequacy of spatially distributing point-observed precipitation data.

取得的主要成果如下：(1)基于四個尺度(1∶250，000久久噜，1∶50，000亚洲精品中文涩，1∶10影音先锋色网站，000，and 1∶5九色国产，000)的數(shù)字高程模型和USPED模型計算的土壤侵蝕結(jié)果對比表明亚洲无码大黄片，1∶50，000的數(shù)字高程模型與更高分辨率數(shù)字高程模型提供了幾乎一樣的用以估算土壤侵蝕所需的地形信息美国黄色肥女一级电影，而1∶250无码毛片区免费毛片，000的數(shù)字高程模型，由于過低的估算了細溝侵蝕和片蝕黄色片色网站，從而過低的估算了土壤侵蝕的總量天天狠天天天天透在线二区。

In the paper, we mostly studied the change of soil erosion process by a new REE tracer method, based on the theories of hydraulic mechanical subject and radionuclear tracer method, and simulated rainfall was applied to study the sheet erosion changing to rill erosion and the rill erosion process on slope land. The new REE tracer method should be useful to future studying of erosion processes on slope lands.1. Offering and testifying a new REE displacing method to study on the soil erosion of the loess slope.

本文以黃土坡面土壤侵蝕形態(tài)演變規(guī)律為研究重點，以新的核素示蹤技術(shù)為手段久久福利网，采用水動力學(xué)與核素示蹤技術(shù)相結(jié)合A片AⅤ免费一级高清欧美特一、室內(nèi)人工模擬降雨與穩(wěn)定性REE元素示蹤相結(jié)合的方法www.久久@.Com，利用先進的INAA技術(shù)，定量研究了不同雨強次降雨條件下細溝間侵蝕向細溝侵蝕的轉(zhuǎn)變過程有什么好看的在线看黄色网站、細溝發(fā)生發(fā)育過程国内免费久久久久久久久久10，為深入了解坡面侵蝕過程，建立黃土高原土壤侵蝕預(yù)報模型提供了研究基礎(chǔ)国产粗口粗暴国产一级视频。

The results indicate that the main erosion type is sheet ero-sion at the beginning of the rainfalls, and serious erosion happens after rill erosion appears. Accumulated sheet and rill erosion amount increases with the rainfalls time. The percentage of sheet erosion amount decreases and rill erosion percent-age increases with time. At the end of the rainfalls, the total rill erosion amounts are 4.3 and 5 times more than sheet ero-sion.

研究結(jié)果表明久久久九九九一精品，降雨初期坡面以面蝕為主，細溝出現(xiàn)后自慰喷水一区二区三区，坡面侵蝕將加快加?9视频免费看。浑S著降雨時間的延續(xù)毛片?，累積面蝕量和細溝累積侵蝕量都將逐漸增加欧美午夜一级艳片欧美精品炮另类，后者的增加速率大于前者，面蝕所占總侵蝕量的百分比隨降雨時間呈曲線形式逐漸遞減爱爱天堂网，細溝侵蝕則逐漸增加农民工出租屋嫖妓；試驗結(jié)束時細溝侵蝕量分別為面蝕量的4—5倍。

The soil erosion process on the slope was clearly divided into sheet erosion stage, rill erosion developing stage and rill erosion stable stage. Before lOminutes of rainfalls, the percentage of sheet erosion amount to total erosion amount was more than 90%, and it indicated that sheet erosion happened on the slope. This percentage sharply decreased before SOminutes of rainfall time, on the other hand, the percentage of rill erosion amount to total erosion amount increased in curve form with rainfall time.

在降雨前10min左右亚洲综合图片日，面蝕貢獻率約占坡面侵蝕總量的90%以上国产又硬又黄又粗视频，為面蝕階段；隨著降雨時間的延續(xù)看黄厂免费视频，面蝕貢獻率先急劇遞減最后在第30min左右基本達到穩(wěn)定精品国内在视频线免费，細溝侵蝕貢獻率則出現(xiàn)相反趨勢，此為細溝發(fā)育階段日韩欧美性片；降雨后期小草影院亚洲私人影院，面蝕和細溝侵蝕貢獻率的變化趨勢逐漸變緩且基本達到穩(wěn)定。

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)域包括溫帶干旱久久久666特级毛片、亞干旱和亞濕潤氣候下的廣大地區(qū)黄页网站在线大全免费观看，如何有效地預(yù)防和治理土壤風(fēng)蝕，如何以最小的代價達到滿意的防治效果黄色网站1，這是很值得研究的問題草草影院日本韩国欧美。

The mostly conclusion is as below: 1 The characteristic analysis of the expressway soil erosion: Expressway soil erosion is different from conventional soil erosion and other soil erosion of exploitation construction project for its 4 outstanding features, including imbalance of soil erosion distribution in time and space; Presenting either threadiness or pinnate distribution in space; The quantity of soil erosion is large;Erosion form is complicated and frequency of causality soil erosion occuring is large.

具體得出的主要結(jié)論如下： 1高速公路土壤侵蝕的特征分析公路建設(shè)土壤侵蝕區(qū)別于傳統(tǒng)的土壤侵蝕，與其它開發(fā)建設(shè)項目中的土壤侵蝕也有所區(qū)別www。操逼。com，有自己突出的特點免费看特大黄片视频，主要表現(xiàn)為時間分布上不平衡；空間上呈線狀或羽狀分布色综合日韩欧美；土壤侵蝕量大黄色理论在线观看；侵蝕類型復(fù)雜，誘發(fā)性土壤侵蝕發(fā)生頻數(shù)大4個方面。

RS technology, the spatial distribution of soil erosion in the Huaihe river basin was analysed according to aviaries of land use and soil type by the Soil Erosion Dangerous Index given in this paper.

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