对边

Direct difference is sensitive to noisy data, so a threshold limitation is given, which can not only filter the result from noisy data but also pick edge points up according men's desire. On the other hand, artificial intelligence is used for segmentation in reverse engineering. Because the essence of segmentation is clustering similar characteristics and self-organizing feature mapping is one function of neural network, SOFM network is used for segmentation in the thesis, coordinates and normal of data points is took as the characteristics vector.

第二种方法，基于双向角度微分的边点提取法，针对三维正交模型采用基于截面线的方式组织数据，此方法比基于曲率半径方法更简洁，不用进行曲面拟合，大大提高了计算速度；计算过程中由数据点的直接差分逼近微分，但直接差分对数据误差敏感，为此，本文提出了阈值过滤的方法，一方面过滤了数据误差在计算结果中引起的噪音，另一方面可以按照设计意图控制边点的提取；来决定是否提取光滑交接的边点。

The result shows that the real state of slope is similar to the forecast result. So it has good practicability that the neural network is used to appraise the open-pit slope stability. The study and application of this method has a great theoretical and practical value for open-pit slope stability analysis.

计算结果表明：边坡实际状态和预测结果十分相近，因此运用神经网络模型评价黄上地区边坡的稳定性有较好的适用性，该方法对露天边坡稳定性预测预报具有重要的理论意义和实用价值。

As the quarry operation evolve, the deeper the pit, the higher and steeper of the highwall, and thus, the influence of blasting vibration may affect the potentially unstable slope which may cause safety problem and result in the shut-down of the overall mining operation.

在露天矿场开采过程中，随著开采深度的增大，其边坡越来越高，特别是对於那些存在不稳定因素的高陡边坡，倘若受爆破震动的影响，极有可能造成边坡的失稳破坏，危及安全生产甚至影响矿山的正常生产秩序。

Considering the restraining moment of the secondary beam , the paper deduces formulas for calculating torsional moment of edge beam of frame.

分析表明带悬臂的框架边梁考虑次梁约束能显著减少边梁扭矩，对普通框架边梁不考虑次梁约束是不安全的

The existence of solutions for two-point boundary value problem subject to nonlinear second order differential equation with mixed boundary conditions is studied by using topological transversality theorem, and some known results are improved.

现利用拓扑横截定理，考虑了二阶常微分方程两点边值问题在组合边界条件下的解的存在性，对二阶常微分方程两点边值问题所对应的辅助问题作先验界估计，并利用拓扑横截定理，得到了边值问题解的存在性，推广了一些已有结果。

The stability of them has an vital influence on project implementation,which is also hand in glove with discontinuity surface, for example,joints,fissure,fault and weak interbed etc.These discontinuity intersect vertically and horizontally ,which makes great difference in property between it and integrated rock.On that account,we should do deepgoing research on deformation failure mechanism and stability analysis for rock mass slopes.

节理岩体边坡的稳定性跟边坡中的不连续面的关系密切，如节理、裂隙、断层以及软弱夹层等，这些结构面纵横切割，使得岩体的性质与完整岩石大相径庭，因此，必须对节理岩体边坡的变形破坏机制和稳定性分析作深入的研究。

The flow resistance and the phase permeability and the coupling of the flow between the reservoir and the wellhole were adopted to admend the deliverability equations of the horizontal well, which improves the applicability of the formula and the adjusted deliverability equations can guide and serve in the fields production with the the horizontal well.

本文以评价边底水油藏水平井产能及影响因素为总体目标，在国内外文献调研基础上，采用镜像反映原理和势的叠加理论推导出边底水油藏水平井产能公式，然后考虑完井、多相渗流及井筒压降对产能的影响，提出了利用流动阻力、相渗透率及井筒与油藏流动耦合修正水平井产能的修正方法，提高预测公式的适用性，为边底水油藏水平井生产提供了指导作用。

Based on lots of indoor observation, tests and analyses by 4 wells in the two areas, it is discovered that authigenic quartz in sandstone can be divided into three kinds:narrow,width and fine crystal. Species and composition of sandstone are the main factors which controled the formation of authigenic quartz.

对周口和通许两地区4口井砂岩的薄片观察、多种测试、分析，发现砂岩中石英的增生可分窄边型、宽边型和自形边型3种，增生石英的发育情况与砂岩的类型、成分等密切相关。

Firstly, it concludes the slope Biotechnique, analyzes its specialties and applied situation, put forwards a method that choosing the slope Biotechnique mode from texture gradient the slope corrade expense and so on; Secondly, it investigates that technology of vegetation construction from the selecting seed and the helping grow, put forwards a method that selecting the seed.

首先，将山区公路边坡生态防护方式进行了归纳，分析了主要方式的特点和适用范围，提出从质地、坡度、坡面侵蚀情况、费用等方面进行方式的选择；然后，从物种选择、植物助长方面对植被建植技术进行了研究，提出了简易可行的五步选种方法；接着，分别以黄土地区山区、秦岭山区的边坡生态防护为实例进行了说明；最后，从景观的角度探讨了山区公路边坡生态防护的协调，提出了协调原则和具体要求。

Through the comparison of the two consequence, a suggestion is given for the buckling coefficients of lipped channel beams.

结合两种结果对直角卷边槽钢的翼缘屈曲系数提出建议取值。选取三种典型截面，分别用ANSYS计算卷边角度为90°、60°、45°的斜卷边Z型截面檩条屈曲系数。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。