Results are as following:The causes of grassland desertification of Hulunbeir are the outcome of interaction of nature and the human beings. Among these reasons, the loose soil texture, which was formed in the fluviolacustrine sediment during Quaternary, establish the physical ground, and the drought and wind is the natural force of grassland desertification. And then over-cutting forest, over-grazing grassland, imbalance of resource utilization and estrepement reduce the coverage of vegetation, therefore provide necessary conditions for the grassland desertification.

其中亚洲三级片视频播放网站，形成于第四紀(jì)河湖相沉積沙的疏松土壤母質(zhì)天天日日日干，為日后土壤風(fēng)蝕奠定了深厚的物質(zhì)基礎(chǔ)野战露脸在线视频国产18；干旱多風(fēng)的氣候條件構(gòu)成了草地風(fēng)蝕沙化的自然營運(yùn)力婷婷操操b；而人為過度砍伐沙地林木資源、沙質(zhì)草地長期超載放牧guochanav、資源利用不平衡以及亂墾黄色网页视频久久、濫挖等不合理經(jīng)濟(jì)行為91精品欧美在线观看免费，又降低了沙化草地植被覆蓋度，為草地風(fēng)蝕沙化提供了必要條件午夜欧美一级性爱视频在线观看。

For example of atom of hydrogen, it must be enough surrounding electrons so can be form a "electron space", it could be form gravitation among electron and proton, at first whole gravitation line may acts with proton ,but if the quantity of electron go to much ,every one can got gravitation line from proton would be lower, the gravitation between proton and electron would be drop, when it is reached fixed lever, this power is equal to expulsive force which between electrons , so it would be reach balance, the electron can't much more.

之間形成引力国产在线人人操，質(zhì)子向外發(fā)出的引力線本來可以全部同外圍電子作用，但是欧美色操，電子多了，每一枚電子從質(zhì)子分到的作用引力線便減少欧美一级黄色大年龄网站，它們同質(zhì)子間的引力要下降欧美AA一级黄片免费看，下降到一定程度，此力等于電子間的斥力日韩欧美一区二区三区夜，達(dá)到平衡激情综合五月激情综合五月65，電子便不能再多。

The results of numerical analysis show that the elastic modular and the poisson ratio have no effect on two-dimensional bearing capacity, but can affect the ultimate bearing capacity of three-dimensional foundations and control the convergence and precision of finite element calculation; the earth pressure coefficient controls the geostatic stress of foundation, sequentially affects the ultimate bearing capacity of foundations and the convergence of numerical calculation. When calculating the ultimate bearing capacity of undrained saturated foundation, the complete formulation exists shear locking, and reduce formulation exists hourglassing, so the hybrid formulation is suitable to imitate the geomaterial. When the soil obeys nonrelevent flow rule, the yielding function is different from potential function, and the elastic-plastic matrix of soil is asymmetric, so the unsymmetry numerical solver and appropriate finite element mesh is required.

研究結(jié)果表明免费黄的网站，土體彈性模量和泊松比對(duì)二維基礎(chǔ)極限承載力沒有影響欧美日本视频，但是影響著三維矩形基礎(chǔ)的極限承載力，控制著ABAQUS數(shù)值算法的計(jì)算精度與收斂速度里番ACG※里番_爆乳；地基土壓力系數(shù)控制著地基土體中的地應(yīng)力平衡国产精品一区24p，從而影響著二維條形基礎(chǔ)和三維矩形基礎(chǔ)的極限承載力和地基破壞包絡(luò)面；對(duì)于不排水飽和軟黏土地基久久亚洲精品无码网，常規(guī)的完全積分單元會(huì)造成剪力自鎖現(xiàn)象国产免费拍拍视频，而減縮積分單元?jiǎng)t存在過于柔化的現(xiàn)象，故采用雜交單元來模擬較合適明星XXXX性videos；當(dāng)土體服從非關(guān)聯(lián)流動(dòng)法則時(shí)欧美一级片免费在线观看，屈服函數(shù)與塑性勢函數(shù)之間存在差異，從而導(dǎo)致土體彈塑性矩陣呈現(xiàn)非對(duì)稱性一级A视频亚洲，在有限元計(jì)算中必須采用非對(duì)稱數(shù)值解法加勒比性交，并且合理地劃分單元才能對(duì)極限承載力進(jìn)行準(zhǔn)確求解。

These characters is not only different from the normal measurement and calculation method but also different from characteristic in indeformable and porous media.

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If a body is acted upon by a number of forces and stillremains motionless, the body is said to be inequilibrium.

如果一個(gè)物體受到幾個(gè)力的作用而仍然保持靜止手机黄网欧美高清，那么該物體處于平衡狀態(tài)。

On all accounts, beams and arches bear loads together in papilionaceous partial tied arch footbridge which can realize the equilibrium of strength and beauty.

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A parabolically profiled prestressing tendon generates a uniform loading which again can be quantified using equilibrium of vertical forces.

阿parabolically異形預(yù)應(yīng)力筋產(chǎn)生一個(gè)統(tǒng)一的欧美在线AⅤ精品，又可以載入量化使用平衡垂直力黄色网站影视电影黑人视频在线观看。

It is more than one hundred years since Tomes initially put forward the concept of perioral muscle pressure and the Equilibrium Theory. Afterwards, plentiful results were achieved. Research on this field is of great importance in orthodontics.

自從1873年Tomes首次提出了口周力的概念以及牙弓內(nèi)外肌壓力平衡理論以來91视频国产美女裸体，至今已有一百多年的歷史了。

Effects of perturbing various model parameters on the equilibriums between native-like states with other conformational states were considered.

我們考慮擾動(dòng)不同力場參數(shù)對(duì)天然態(tài)和其它構(gòu)象態(tài)之間平衡的影響在线观看国产黄AV免费看。

Strip limit minimum rollable gauge and minimum rollable gauge considering productivity are analyzed and derived using new rolling pressure model, work roll surface temperature rise formulae is derived on the basis of mill stand thermal balance. The affecting factors of work roll surface temperature and the influences on the choice of roll size are discussed.

本文從軋機(jī)結(jié)構(gòu)設(shè)計(jì)欧美性爱特黄色视频、力能參數(shù)計(jì)算、強(qiáng)度設(shè)計(jì)計(jì)算等方面綜合論述了輥系參數(shù)設(shè)計(jì)計(jì)算的基本理論一级A片免费播放清高视频，在理論上提出了采用考慮粘著摩擦的混合摩擦模型和考慮軋件的彈性變形計(jì)算冷軋薄板軋制壓力的方法大黄av，推導(dǎo)并以冷軋機(jī)實(shí)測軋制壓力驗(yàn)證了軋制壓力新模型；應(yīng)用新的軋制壓力模型分析并推導(dǎo)了軋件極限最小可軋厚度和考慮生產(chǎn)率的最小可軋厚度公式三级网站在在线观看视频；根據(jù)工作機(jī)座熱量平衡原理推導(dǎo)了工作輥溫升公式色色色s，分析了工作輥溫度的影響因素，研究了工作輥溫升對(duì)軋輥參數(shù)選擇的影響人人爽人人摸人人。