The design method of fourth order sound band pass loudspeaker enclosure is analyzed in the paper.
主要分析了四阶声带通型音箱的设计方法。
Fourth order cumulant (FOC) different slice-based adaptive dynamic line enhancement algorithms are presented.
提出了基于四阶累积量不同切片的间接自适应动态线谱增强算法。
By some abstract results of operator equation, the fourth order singular boundary value problem was discussed.
利用算子方程的一些抽象结果来讨论四阶奇异边值问题。
The stabilized mixed finite element approximation for fourth order obstacle problem is investigated in this paper.
本文讨论了四阶障碍问题的稳定化混合有限元方法。
The initial boundary value problem of fourth order wave equation with dispersive and dissipative terms is studied.
研究具色散和耗散项的四阶波动方程的初边值问题。
Using the perturbation method we have got the fourth order of approximation of the velocity potential to the problem.
运用摄动方法，给出了速度势的四阶近似，然后得到了圆柱表面的无量纲的压力系数和阻力系数。
Based on uniform linear array and fourth order cumulant, a novel blind algorithm for spatial signature estimation was presented.
以均匀直线阵和四阶累积量为基础，提出了一种新的空间特征盲估计算法。
Because the fourth order cumulant is insensitive to Gaussian noise or interference, the performance of the estimates can be increased.
由于四阶累积量对高斯噪声和干扰不敏感，从而可提高估计的分辨性能。
The forced vibration of pendulum is described by four-dimensional phase space and the fourth order autonomous ordinary differential equation.
本文用四维相空间和四阶自洽常微分方程描写了单摆的受迫振动。
Unconventional double set parameter finite element approximation for a fourth order variational inequality with displacement obstacle is considered.
研究位移障碍下的一个四阶变分不等式的非常规双参数有限元逼近。
By using fixed point theorem in cone, the authors discuss the existence of positive solutions of fourth order two-point ordinary differential equations.
应用锥上不动点定理讨论一类四阶两点边值问题正解存在性。
This paper puts forward a new MRACS method using low order model, i. e. the fourth order hydraulic servo system following the first order reference model.
本文把液压伺服系统作四阶系统，跟随一阶参考模型，提出了一种新的高阶对象和低阶模型的MRACS 的方法。
Various borehole and formation conditions were simulated using the fourth order accuracy in space and second order accuracy in time centered finite difference method.
利用空间上具有四阶精度、时间上具有二阶精度的中心差分方法，数值模拟了几种复杂井眼条件下的波场。
In this paper, it is presented that the locus of a line crossedwith each of two guide lines and a guide conic not being on a commonplane is a ruled surface of fourth order.
本文提出了由一条二次曲线和与该二次曲线不共面的两条异面直线为导线，与该三导线均相交的直线轨迹是一个直纹四次曲面，并讨论了二次曲线分别为椭圆、双曲线和抛物线时，形成的曲面的形状特征。
This paper describes the asymptotic and oscillatory properties of solutions of initial boundary value problems of linear and semilinear parabolic equations of second and fourth order.
本文考虑一类二阶及四阶线性和半线性抛物方程初边值问题的解的渐近性与振荡性。
The fourth order Runge-Kutta method is used to transform the mathematics model into discrete simulation model, using MATLAB7.0 simulation software to simulate its dynastic performance.
采用了四阶龙格-库塔算法，将数学模型转换为可仿真的离散模型，并利用MATLAB7.0对其进行了计算机仿真。
Generally, under the case of enough amounts and evenly distributed of coincident points, the accuracy of GPS height fitting can meet the requirement of the fourth order leveling network.
一般在重合点数量充足且分布均匀的情况下，GPS高程拟合的精度可达到四等水准网的精度要求。
In this paper, the initial-boundary value problem of a kind of nonlinear fourth-order wave equations with damping and source terms is studied on the base of Beam equation.
本文在梁方程的基础上研究了一类具有非线性阻尼项和力源项的四阶波动方程的初边值问题。
In this paper, a fourth-order cumulant-based ESPRIT DOA estimation method is presented for arbitrary array.
本文提出了一种基于四阶累积量的ESPRIT超分辨阵列测向算法，该算法适用于任意形状排列的空间阵列。
By using a new three-solution theorem, we obtain the existence and multiplicity of positive solutions for fourth-order boundary value problem.
讨论了四阶边值问题，通过应用一个新的三解定理，得到了其解的存在性与多重性。
Contrapose this phenomenon, a new method based on fourth-order cumulants diagonal slice for detecting ship-radiated noise is presented.
针对这一情况，本文提出了一种使用四阶累积量对角切片检测舰船辐射噪声的方法。
In chapter I, we mainly use the strongly monotone operator principle and the critical point theory to discuss a kind of fourth-order two-point boundary value problem.
在第一章中，我们主要利用强单调映象原理和临界点理论对一类非线性四阶两点边值问题进行了讨论。
A new type cumulant-based virtual DOA matrix is formed using the property of aperture extension of fourth-order cumulants.
利用空间四阶累量的孔径扩展性质，构造了一种新的累量域虚拟阵列波达方向矩阵。
The existence and multiplicity results are obtained for a class of fourth-order nonlinear elliptic equations by the least action principle and the minimax methods, respectively.
通过极小化作用原理和极小极大方法得到了一类四阶非线性椭圆方程解的存在性和多重性。
The prize was awarded in 1815 to Sophie Germain, a celebrated woman mathematician, who derived the correct fourth-order differential equation.
该奖项在1815年颁发给个索菲。热尔曼，一位著名的女数学家，她推导出了正确的四阶差分方程。
An existence theorem of twin positive solutions is established for a nonlinear fourth-order two-point boundary value problem.
对于非线性四阶两点边值问题建立了一个孪生正解的存在定理。
An existence theorem of twin positive solutions is established for a nonlinear fourth-order two-point boundary value problem.
对于非线性四阶两点边值问题建立了一个孪生正解的存在定理。
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