查询词典 symmetry axis

There is an original relationship between traditional hakka residential architecture and the social histories and the regional natural environments at that time. The traditional hakka residential architecture in Meizhou is established on Nature worship, and keep in harmony with natural environments. For examples, the locations of bildings are in line with local conditions; the layouts and styles are usually based on the rule of south exposure and central axis symmetry; the structures lay stress on functions and comfort and harmony with local environments. Unreasonable artificial alteration, for example, cutting slope and building house under the slope are usually triggers landslides, collapses and other geological disasters, and it has become the most dangerous and latent factor to the geological disasters. The ecological environment idea of the traditional hakka residential architecture in Meizhou region has still certain referential significance for modern residential architecture.

实证应用分析研究表明，梅州客家传统民居建筑与当时的社会历史背景、区域自然环境因素之间存在着密切关系；客家民居建筑渗透出尊重自然，与自然环境融为一体的生态环境理念，具体表现为选址上做到因地取舍与回归自然相统一，布局上讲究座北朝南与中轴对称相结合，建筑上注重实用舒适与环境氛围相融合；不合理削坡建房常常诱发崩塌、滑坡等地质灾害，成为地质灾害发生的最大潜在因子；梅州传统客家民居建筑的生态环境理念对现代民居建筑仍然具有借鉴与启示作用。

By use of symmetry of integral domain to coordinate surface, coordinate axis and coordinate origin, some useful formula to compute the integral are constructed, which are illustrated very useful and effective.

通过对积分区域的对称性和被积函数的奇偶性的讨论，从积分区域关于坐标平面、坐标轴和坐标原点对称出发，建立了简化各类积分计算的常见公式，并用例于展示了公式的有效性。

The first 3D dimensional polymeric cluster 〓(8) has been synthesized though solid state reaction, the X-ray structural analysis showed that the three-dimensional framework of 8 has a very high degree of symmetry with three mirror planes and one four rotation axis in I4/mmm space group, and composed of two building blocks 〓 and 〓 bridged by S-Cu〓 and Cu〓-Cl bond.

化合物6非线性折射值n〓为-9.3×10〓m〓·w〓，显示自散焦性质，与我们以前观察到的现象相反，这可能是配体作用造成的；非线性吸收值α〓 1.23×10〓m·w〓，表现出较强的非线性吸收效应。

When a solid region in three-space has an axis of symmetry, the evaluation of triple integrals overis often facilitated by using cylindrical coordinates.

当空间立体区域有一个对称轴时，计算上的三重积分通常使用柱坐标比较容易。

The axially symmetric torsion of rigid circular shaft of varying diameter embedded in an elastic half space is studied by line-loaded integral equation method, where the problem is formulated by distributions of fictitions fundamental loads PRCHS (point ring couple in half space) along the axis of symmetry in interval of the shaft and is reduced to a one-dimensional and non-singular Fredholm integral equation of the first kind and is easily solved numerically.

弹性半空间；本文用线载荷积分方程法研究嵌在弹性半空间的刚性变直径圆轴的轴对称扭转。利用将"半空间的点环力偶"这一虚的基本载荷沿对称轴的圆轴区间中分布就能使本问题归结为一个一维的非奇异的Ferdholm第一种积分方程，且很易用数值求解。文中给出刚性圆锥，圆柱，圆锥柱嵌在弹性半空间的扭转的数值计算的例并和他人的已知结果相比较。

Based on two algebra Riccati equation method especially the structure of the system Hamilton matrix and system observability theory, the role of invariant zeros in constructing system reduced order controllers was given. That is, by the suitable selection of free parameters of the system H(subscript ∞) controller, some points which were symmetry with the unstable invariant zeros about the imaginary axis became the stable poles of the system controller which were not observable and could be reduced from the system, thus could get further reduced order controller.

基于2代数黎卡提方程方法，特别是系统Hamilton矩阵的结构特点和系统可观测性理论，论述了不变零点在构造系统降阶控制器中所起的作用，即通过选择控制器的自由参量，使某些不稳定的不变零点关于虚轴对称的点构成系统控制器不可观的稳定极点，从而实现了控制器进一步降阶。

The results show that, the distribution of magnetic field and electromagnetic force in the aluminum film on the cathode slope are in symmetry to the long axis of the cell, especially the magnetic force is in the same direction as the gravity force, which is in favor of the aluminum discharging from the cathode slope. The highest fluctuation of aluminum pad surface in the accumulation sump is 0.021 m, which still remains within the safe range, and will not cause interpolar short circuit, so a normal operation process could be maintained with the same bus bar configuration as the current 75 kA aluminum reduction cells.

结果表明：阴极斜坡表面电磁场和电磁力场分布基本呈沿电解槽长轴对称分布，且电磁力与重力方向相同，这有利于阴极表面电磁力向聚铝沟排放，而在电磁力作用下，聚铝沟内铝液波动最大幅度为0.021 m，仍保持在安全范围之内，不会引起两极短路现象的发生，表明在现有75 kA普通预焙槽母线配置方案下，可以维持导流型结构电解槽的正常运行。

On basis of the theory of metal plastic fluid and research of die cavity on non axis symmetry extrusion of special shaped products, in virtue of mathematical research results of the conformal mapping theory, by using method of normal convergence, numerical value analysis of mapping function was built.

针对非轴对称金属异型挤压塑性流动及模腔研究的理论课题，借助于近代共形映射数学理论研究成果，利用法线收敛法，建立了映射函数解析方法。

The numerical experiment is done by using finite element analysis. The dynamic responses are simulated for of integrate anchorage system and anchorage systems with different defects through 1-D and axis symmetry numerical calculate.

通过分析，锚杆—围岩结构系统的数值模拟解和试验结果都可用本文所建立的数学力学模型的分析解来拟合，这从参数反演角度进一步证明了所建立的模型是科学合理的，其分析求解方法是正确的。

Almost all existed research works fasten on those transversely isotropic media with vertical or horizontal axis of symmetry., but rare are studies of orthotropy that is more common for rocks in sedimentary basin .

而在沉积盆地中较普遍存在着正交各向异性的情况。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。