This paper addresses a new boundary detection algorithm called BORAL (Boundary Points Detector Based on Angle), according to the problem of low efficient boundary detection and that it is uneasy to determine the scope of the parameter pruning in data mining.
针对目前数据挖掘中边界点检测效率低、参数阈值范围不容易确定的问题，提出一种新的边界点检测算法BORAL。
Using the Ritz Method and Finite-Layer Method, The bending of angle-ply thick laminates of bimodulus composite materials with simply supported boundary conditions is investigated.
本文应用里兹法和有限层法［1］研究了简支条件下双模数复合材料角交铺设厚层板的弯曲，并研究了层板长宽比、正交各向异性比、多模数比以及铺层角对层板中心挠度的影响。
In the design of symmetric Y-branch, we combined the effective refractiveindex method, 2-D wide-angle finite difference beam propagation method and complementary operators method as the absorbing boundary condition to analyze and compare the optical transmission loss of Sbend Y-branch and normal Y-branch. On the basis of the analysis and compare, we designed the improving structure of the short-length normal Y-branch to decrease the transmission loss and improve the repetition of fabrication.
在此分析比较的基础上，确定采用直接转向型Y-分支作为芯片对称Y-分支功分器基本设计，并对直接转向型Y-分支分支处和输出波导拐角处这两个产生损耗较大的区域进行了优化设计，提出了在现有工艺条件下较易实现的优化结构，不仅降低了Y-分支长度较短时的传输损耗，而且降低了制作中对工艺精度的要求、提高了工艺制作的可实现性和重复性。
Aimed at three kinds of boundary point s on the wall, the method is presented that the boundary point is measured by reducing angle and distance error and it is proved by theory and practice.
针对墙面上的三种界址点，提出以减少测角和测距误差的偏心法观测，并得到了理论和实践的论证，具有一定的实用价
The ESE and segregation energies of impurities for a large angle grain boundary in Ni were calculated by using Recursion method.
用Recursion方法计算了B，C，La，Y，Sc，P，S在晶界的环境敏感镶嵌能和B，C，La，Y，Sc在自由表面和晶界的隔离能。
Numerical results show that in order to solve the problem of wide angle wave propagation in the unbounded space, it is necessary to combine the high order PE algorithm with the nonlocal boundary condition.
数值计算结果表明随着入射角度的增加，必须借助于高阶PE算法并结合NLBC来处理无界空间大角度波的传播问题。
In order to improve the precision of calculation, the density of unit is enlarged when we calculate the boundary integral discretization, as well as the problem about angle-point is conducted using uncoordinate unit method. The velocity field and press distribution of inner point are acquired.
为了提高计算精度，在对边界积分离散化计算时，增大了单元的密度，并对角点问题用非协调单元法进行了处理，得到了速度场和内点的压力分布。
Thus, the paper analyzed the enterprise boundary decision from the angle of information.
因此，在信息视角下，企业就是一个信息获取、处理和使用的机制，企业的边界是由企业的信息能力大小决定的。
The main results in this paper as follows: First, a prototype of a shape-based image database retrieval system is completed, it can receive the query mode both by giving an example image and by sketching the desired object on the screen, Second, five shape-based image retrieval methods are realized; Third, an algorithm based on triangulation for shape-based image retrieval is brought forward. In this algorithm, firstly, the edge of the original image is followed and the candidate corners in the original image are detected. Then the counterpoints of the candidate corners in the result of edge follow are found, and the boundary corners whose counterpoints have been found are queued in the order of their counterpoints in edge follow. After these steps, the boundary corners are triangulated and triangles are obtained which can show the true shape of the original image. Finally, shape feature is obtained by calculating the angle histogram of the triangles.
同时本文中主要完成了以下三方面的工作：完成了一个基于形状特征的图象检索的原型系统，可实现例子图象或徒手绘草图两种查询方式；实现了五种利用形状特征进行图象检索的具体方法，并对其进行了分析比较；并且在继承将三角剖分引入形状检索的思想基础上提出了利用三角剖分进行形状检索的一种新算法：先对原图象进行边界跟踪和角点检测；然后寻找初始角点在边界跟踪中的对应点，并对找到对应点的角点按其对应点在边界跟踪中的顺序进行排序；再对排序后的角点进行德洛内三角剖分，得到能表示目标真实形状的三角形序列；最后计算三角形序列的角度直方图作为形状特征，并进行相似性匹配。
Results obtained in the present study show very good agreement with the experimental data. The flow field properties of various flow parameters and geometric parameters of isolator were computationally evaluated in the thesis. The effects of the parameters including back pressure, Mach number, boundary layer thickness, Reynolds number, L/H, divergence angle, scaling and aspect ratio were discussed.
最后通过数值模拟研究了出口反压、来流马赫数、附面层厚度、来流雷诺数、长高比、扩张角、缩比和宽高比对隔离段内部流场的影响，获得了大量的计算结果，较为详细地给出隔离段内部流场随不同流动参数和几何参数而变化的规律。
In the foreshock coordinates, the magnitude of deceleration is inversely proportional to D BS measuring the distance between the satellite and the bow shock along the interplanet magnetic field, and also inversely proportional to θ BN （the angle between the IMF and the bow shock normal）. The decelerations mainly occur when D WS (the distance from satellite to the ULF wave boundary along X direction) is less than 6 R e.
结果表明，在激波前兆坐标系中，太阳风减小的速度随观测点到激波的距离 D BS增大而减小，随行星际磁场与激波法向夹角θ BN增大也减小，在ULF波动区深度 D WS小于6 R e的范围内最为显著；伴随着太阳风减速的另外一个现象——太阳风的偏转，也存在相似的规律。
It is considered: after the position of the blunt-body shifting inboard, the free expansion of primary air is limited by table firing chamber, the extended angle is deseased, at the same time, the velocity of boundary layer is increased, which makes the deflection of air deseased, and the confluence moves to the front.
可以认为：钝体位置向内缩进后，稳燃腔限制了一次风煤粉气流的自由扩展，使扩展角减小，同时由于边界层速度增大，使气流的偏转减小，汇合点前移。
Through comparison analysis on the induction resistivity curves of two logging methods mentioned above, this paper concludes that there is little difference inside the formation, but at the boundary and the nearby area the former resistivity is larger than the latter due to the significant influence by boundary surface load, the infiltrated depth of drilling fluid, and the angle between borehole and formation.
在比较了水平井中随钻测井和电缆测井感应电阻率曲线之间的区别后，得出以下结论：两者在储层内部相差较小；在界面处及其附近的响应特征受地层界面表面电荷、钻井液侵入深度大小及井眼与地层夹角大小的影响较大。
In different spray advance angle the predicted in-cylinder pressure curve can fit test curve well that proves the accuracy of the mathematic models involved in the multi-dimensional transient numerical simulation and the reliability of the application of whole model simulation. In addition the results show radiation heat transfer accounts for about 30%of the total heat transfer in diesel engine cylinder and heat transfer of piston accounts for 60%of the total heat loss.4.On the base of multi-dimensional transient numerical simulation of in-cylinder working process three dimensional coupled computation model which combines in-cylinder working process and combustion chamber components was built using partition solution method and boundary coupled method. So three dimensional complete model simulation by coupling in-cylinder working process and combustion chamber parts was realized and the effect of heat transfer space no-uniformity on in-cylinder heat transfer, flow, spray, combustion and emission is studied. Results show the effect of wall temperature space no-uniform distribution of combustion chamber components on heat transfer happens mainly at the end of compression stroke and expansion stroke. Therefore it can be concluded that wall temperature space no-uniform distribution of combustion chamber components would influence heat transfer during intake and exhaust stroke obviously. The wall temperature space no-uniform distribution of combustion chamber components is hardly related to in-cylinder gas flow, which is mainly dependent on the combustion chamber components structure, intake system structure, fuel spray nozzle structure, nozzle position and spray intensity. From the results of fuel atomization simulation it can be known the wall temperature space no-uniform distribution of combustion chamber components has certain influence on fuel atomization at the initial and middle stage of spray, mainly in the bottom space of combustion chamber and near cylinder wall. At the late stage of spray in-cylinder gas temperature is mainly dependent on fuel combustion, not on heat transfer of cylinder wall, so the wall temperature space no-uniform distribution of combustion chamber components has nearly no effect on spray. However at this time radiation heat transfer acts on spray remarkably that result in heat transfer increasing and spray getting worse. The heat transfer space no-uniformity of combustion chamber components has certain effect on CO_2 formation during spray and reduces gradually until late combustion stroke. For CO the situation is on the contrary. In addition radiation heat transfer influences the whole combustion process deeply. The heat transfer space non-uniformity of combustion chamber components directly influences the formation of NO_x and convection heat transfer space non-uniformity mainly influences the formation of NO_x near combustion chamber wall surface. The radiation heat transfer space non-uniformity mainly influences the formation of NO_x within combustion chamber space and not near the wall surface. The heat. transfer space non-uniformity of combustion chamber components has little effect on soot formation, far less than on NO_x.
在缸内工作过程多维瞬态数值模拟计算校验基础上，利用分区求解、边界耦合法建立了缸内工作过程与燃烧室部件的三维耦合计算模型，从而实现了缸内工作过程与燃烧室部件的耦合三维全仿真模拟计算，以此考察燃烧室部件传热空间非均匀性对缸内传热、流动、喷雾、燃烧和排放的影响，结果表明燃烧室部件壁面温度的空间非均匀分布对传热的影响主要是在压缩过程和膨胀过程后期，由此可推断在进气过程和排气过程中燃烧室部件表面温度分布的非均匀性对传热会有较为明显的影响；燃烧室部件壁面温度的空间非均匀分布对缸内气体流动几乎没有任何影响，缸内流动主要取决于燃烧室部件结构、进气系统部件结构以及喷油嘴结构、喷孔位置和喷射强度等；燃油的雾化效果的计算结果发现，喷雾初期和中期燃烧室部件壁面温度的空间非均匀分布对燃油的雾化有一定影响，主要影响燃烧室底部空间和壁面附近区域，在喷雾后期，此时缸内气体温度主要取决于燃油的燃烧，壁面换热的影响本身就极小，因此壁面温度分布的空间非均匀性对雾化的影响也极小，但辐射传热对燃油雾化效果会产生显著影响，换热量的增加使整体雾化效果下降；喷雾过程燃烧室部件传热空间非均匀性对燃烧产物CO_2的生成会产生一定影响，而燃烧过程后期这种影响逐渐减弱，其对中间产物CO的生成的影响则相反，另外，辐射换热对整个燃烧过程起到至关重要的决定性作用；燃烧室部件传热空间非均匀性影响最明显的是NO_x的生成，对流换热的空间非均匀性主要影响燃烧室壁面附件区域内NO_x的生成，辐射换热的空间非均匀性主要影响整个燃烧室空间内部NO_x的生成，在燃烧室部件壁面附件区域内的影响较小；燃烧室部件传热空间非均匀性对碳烟生成的影响要远远小于对NO_x生成的影响。
Hence, based on acoustic potential function and boundary condition on solid interface, we get reflection coefficient and refraction coefficient of longitudinal wave and transverse wave on solid-solid interface, and provide approximate formula of the reflection coefficient and the refraction coefficient about the first critical angle of incidence. We analyze relation between the refraction coefficient and acoustic impedance.
为此，基于固体介质的声势函数和界面的边界条件，推导了固-固界面纵横波的反射系数和透射系数，以及第一临界角入射情况下反射系数和透射系数的近似公式，并且分析了透射系数与声阻抗之间的关系。
Moreover, a deviating angle of about 10° existed between the (111)〓 and (111)〓 atomic planes Formation of these deformation twins and their boundary structures is due to pinning of matrix gliding dislocations by the twin boundaries or dislocation reactions between matrix gliding dislocations and boundary twinning dislocations.
形变孪晶带及其界面位错结构的形成是由于γ基体中的位错滑移到形变孪晶界上被钉扎，孪晶界上的孪生位错与基体中位错发生了位错反应的缘故。
Force innovation road, explore nominal new Yi, alternate angle flexiblely, lead into student the feelings boundary of creation, make music lesson genuine accomplish relaxed happy.
力创新路，探索形式上的新意，灵活地变换角度，把学生引入创造的情境，使音乐课真正做到轻松愉快。
Equations and boundary conditions for tilt angle and twist angle of director are obtained with variation theory.
通过变分理论得到指向矢倾角和扭曲角满足的方程和边界条件。
However, determination of an angle of refraction for a ray passing through a boundary between transparent and stronglyoptically-absorbing media is still quite difficult.
这一定律被广泛应用于透明物质，但应用在金属吸收介质(即光线通过吸收介质/介质边界)时的情况，至今仍是一个未被很好解决的难题。
The equilibrium equations under local coordinate are obtained through Euler angle transformation. In the modeling of warp, otter door is treated as the end node. The equilibrium equation of otter door is established through d'Alembert's principle. It provides the end boundary condition of the dynamic model of warp.
通过欧拉角的转换关系获得了曳纲微元段矢量动力平衡方程在曳纲局部坐标系下的方程组形式；在建模过程中，将网板视为曳纲的尾部节点，根据达朗伯原理建立了网板的平衡方程，并将其作为曳纲模型的尾部边界条件。