A kind of expression of approximate solution for domain mode of the new waveguide, including symmetric, unsymmetric arc, parabolic arch, hyperbolic arch, elliptic arch, etc., is constructed by using boundary condition of mental waveguide, variational method and boundary element method.
利用金属波导边界条件、变分法、边界元素法构造这种新波导中主模场的一种近似解表达式，包括曲面横截线为对称、非对称圆弧，抛物线弧，双曲线弧，椭圆弧等。
In this paper four non-spherical surface types have been chose, ellipsoid surface, parabolic surface, pointed arch surface and conical surface. Base on the best fineness ratio, four surfaces are modeled, and their properties are analyzed in detail.
本文选择椭球面、抛物面、尖拱面、圆锥面这四种非球面面型整流罩，在基于整流罩最优的长径比的基础下，对各种情况分别进行建模，并对其光学性能进行了详细分析。
Methods The states of forces sustained by arcus plantaris were analysed and calculated, according to the mechanism of quadratic parabolic arch.
方法采用二次抛物拱的原理来分析和计算足部纵弓的受力状态。
The arch axis of arciform aqueducts formed by the continuum topology optimization method was compared with the circular arch axis and the parabolic arch axis of the same span.
结果表明，由结构拓扑优化方法生成的拱轴线，自重作用下的弯矩值以及相同均布荷载作用下的应力值都比相同矢跨值的圆弧拱轴线和二次抛物线拱轴线小。
Firstly, on the basis of the assumption that arch axis is parabolic, according to the static equilibrium condition and strength condition inside horizontal plane and vertical plane, a calculation formula of piles spacing is derived; and corresponding rational calculation formulas for piles spacing are obtained respectively.
首先在假定土拱的轴线为抛物线的基础上，根据水平面、竖直面内的静力平衡条件和强度条件，推导出桩间距的计算公式，分别得到了相应的合理桩间距计算方法。
Dynamic bucking analysis of shallow parabolic arch based on the method of inertial manifolds with time delay
基于时滞惯性流形的浅拱动力屈曲研究
The parameter selection problem of concrete parabolic double-curvature arch dam is tried to investigate through bearing capacity analysis of arch dam structure.
并试图通过对拱坝结构受力特点的分析，探讨混凝土抛物线双曲拱坝体形参数的选取问题。
In order to design an arch structure with good nonlinear dynamic characteristics, the nonlinear dynamic behaviors under a long time external force have to be investigated. The chaotic behaviors of the parabolic elastic arch with two hinge supports subjected to a transverse distributed varying periodic excitation are investigated in this paper.
要设计出具有好的非线性动力学特性的拱结构，需要了解拱在外激励下的长期非线性动力学行为，对两铰抛物线弹性拱在横向周期荷载下的混沌运动行为进行了研究。
This paper introduces Shapai RCC Arch Dam configuration design and describes in particular the comparison between a three center single arch dam & parabolic double curvature one.
介绍了沙牌碾压混凝土拱坝的体形设计，重点介绍了三心圆单曲拱坝和抛物线双曲拱坝的比选。
Poincar é Bifurcation of a Cubic System with Parabolic Arch Boundary and Periodic Ring
以抛物弓形为边界的周期环域的三次系统的Poincaré分支
Computation of Inner Force of the Parabolic Fixity Arch Bridge with Variable Cross Section on Slope
斜置变截面抛物线坡拱桥的内力计算
However, it is restricted in application owing to the lack of a sound theory about the calculation of force of the parabolic oblique arch bridge.
但对抛物线斜板拱桥的受力计算尚无成熟理论，使之应用受到限制。