截面

The stealth warplane for the microwave radar usually have complicated structures with the coating of wave absorption. On the base of calculation and modeling of the geometrical structure of the warplane in real size, the HF RCS of the air crafts under two different polarizations in different direction have been calculated with the FDTD. The result shows that the above mentioned stealth warplane have the obvious characterstics of frequency resonance, polarization and the relatively large RCS in HF Band 10-30dBm2, which can be used as the theoretical reference for selection of working frequency for sky wave OTH Radar and it also means that the sky wave OTH radar has good capability of anti-stealth targets quantitatively.

对微波雷达具有隐身作用的飞机，其形体较为复杂且表面涂敷有强吸波材料在对一种具有隐身几何外形结构实际尺寸飞机进行计算建模的基础上，文中采用FDTD技术得到了两种极化状态下该飞机无涂敷时不同方向上的短波雷达截面RCS值其结果显示了这种隐身几何外形飞机在短波波段有明显的频率谐振特性、极化特性和较大的RCS10-30dBm2，可为天波超视距雷达在选择工作频率时提供理论参考，并定量地说明天波超视距雷达具有较优的反隐身目标能力

The calculated results show that the CaI vibrational population peaks moved to low value.The calculated cross-section changed slightness duo to isotope effect. The angle product distributions tend to backward scattering also and isotope effect is not observably. Thecalculated

由于同位素效应的影响，产物Cal的振动态分布向低振动态转移；反应体系的散射截面在低碰撞能和高碰撞能处有些微变化；受到反应物质量因子变化的影响，转动取向值减少，产物转达取向强烈；产物的角分布同位素效应不明显。

By cutting the root of main aspects of the box button in reason. The level of the stress centralized on the thread at the root can be reduced largely; section chopping is smoothed, and slack line come into being.

3进行合理地切削母扣大端根部可明显降低螺纹在根部集中应力水平，平缓了该处的截面突变，产生应力松弛线。

Based on f the stability computation theory of structures are elaborated in brevity and in consideration of material elasticity and geometrical nonlinearity, the 3-D model of finite element in studying on in-plane elastic ultimate load-carrying capacity of 工-section arches with holes in soffit is built by ANSYS software.

本文在简要阐述结构稳定计算理论的基础上，利用ANSYS计算软件，在弹性材料、几何大变形条件下建立了研究腹板开洞工形截面钢拱平面内弹性极限承载力的有限元三维模型，并把极限承载力的各种影响因子设为变量，形成了整个计算过程的MAC文件。

The interface bond capability and the failure mode of soffit strengthening are studied, as well as the influence of strengthening concrete technique to the interface bond capability. The cracked load, the failure load, the tension stiffness, the stress of the steel bar and the cracks of the strengthening arch are compared with those of the contrast arch.

第五，考虑到实际工程应用，设计并制作了采用增大截面法在拱腹部位加固钢筋混凝土拱圈试件，研究拱腹加固新老混凝土结合面的粘结性能及破坏形式和补强混凝土的施工工艺对新老混凝土结合面粘结性能的影响。

The influence of the depth of diaphragm wall-pile cap, the soil properties at pile tip, the distance between diaphragm wall and pile, and the size of pile on the deformation and load transfer of diaphragm wall-pile system are investigated.

并分析了墙桩顶部承台厚度、桩持力层、墙桩净距以及桩截面积等的变化对墙桩荷载分担以及整体变形的影响。

The formula for lower limit of natural frequency of tapered pier of continuous beam bridge were derived by the combination of Rayleigh and Southwell method.

采用瑞利法和Southwell频率合成法，将基频表示成各惯性元与复位元所组成的子系统的频率合成，导出了变截面桥墩自振频率下限的计算公式。

The formula for lower limit of natural frequency of tapered pier of continuous beam bridge were derived by the combination of Rayleigh and Southwell method. The natural frequency of tapered pier was composed of the sum of frequency of each subsystem consisted in inertia component and deformable component.

采用瑞利法和Southwell频率合成法，将基频表示成各惯性元与复位元所组成的子系统的频率合成，导出了变截面桥墩自振频率下限的计算公式。

Pass numeric computation, the dot on the axis in researching diffractive field and the spectral change that cross section manages and spectral switch phenomenon, and the influence with spectral to point of observation length of be concerned with.

通过数值计算，探究衍射场中轴上点和横截面处的光谱变化和光谱开关现象，以及相干长度对观察点光谱的影响。

In spherical polar coordinates we get surfaces with the familiar figure eight cross section; again, these are graphs and not orbital shapes.

猛枷撸0得到熟知的8字形截面；再说一遍，这是图线而不是轨道形状。

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％。