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In this paper,the asymptotic property for two kinds of ecological systems and oscillation for solutions of a neutral differential equations is studied by employing differential inequalities and using eigenvalue analysis,iterative algorithm,induction and comparison theorem etc.Here, the system\'s asymptotic property includes the uniform persistence,the global attractability of the solutions,the asmptotic stability of the solutions and the oscillation of solutions.

本文利用微分不等式、特征根分析法、迭代法、归纳法及比较原理等方法和理论,研究了两类生态模型解的渐近性和一类脉冲中立型微分方程解的振动性,其中包括模型的一致持久生存性,正平衡态的全局吸引性、局部与全局渐近稳定性以及解的振动性。

The asymptoticbehavior of two ecological systems and the unconditionally stability and oscillations in kinds of 4-order delay difference equations are investigated by using analysis method, constructing Lyapunovfunctions, the logarithmic norm, charateristic roots theory and the bifurcation theory. Here, theasymptotic properity includes the uniform persistence, the global attractability of the solutions,the asymptotic stability of the positive solution local or global and the oscillations of solutions.

本文利用定性分析的方法、比较原理、特征值分析法、对数范数、构造Lyapunov函数及分支理论等方法和理论,研究了两类生态模型解的渐近性及一类四阶时滞微分方程解的无条件稳定性,其中包含模型的一致持久生存性、正平衡态的全局吸引性、局部和全局渐近性以及解的振动性等问题。

It must be remembered that a bridge is basically a comparison method of measurement,where impedance ratios balance the bridge.

必须牢记电桥的基本原理是比较测量法,即交流电桥是阻抗比率平衡电桥。

Torie does balance color well, however, with elements of the same color speaking to each other: red chair to red basket to red pillow, blue wall to blue shelf to blue fabric panel.

汤瑞的色彩平衡设计的还是不错的,无论如何,带有相同基础原理的色彩元素就会彼此相互呼应:红色的椅子红色的小篮筐还有红色的枕头相呼应,蓝色的墙蓝色的书架和蓝色织物装饰搭配。

The colonizing process of protozoa on PFU has be shown to be fitted to the MacauthurWilson equilibrium model of island biogeography.

实验结果证实了PFU原生动物的群集过程符合生态学的基本原理—MacArthur—Wilson岛屿生物地理平衡模型。

From the ionization constant and electrical neutral principle of weak acid solution, we can draw out chemical balance equation of acid radical ion of acid salt, electric charge conservation equation and supplies conservation equation.

根据弱酸的电离常数和溶液的电中性原理等,可导出其酸式酸根离子的化学平衡式、电荷守恒式和物料守恒式,判断酸式酸根离子所引起的溶液酸碱性及其强弱,从而得出定量判据

This kind of gyro uses twoposition force feedback balance method and complementary angle correction method to eliminate the effect of gyro constant drift to improve the precision of bearing calcuation .

介绍一种数字式寻北陀螺仪,它立足于国内现有条件,以计算罗经原理为基础,采用双位置力反馈平衡法和补角修正措施,用来消除陀螺常值漂移的影响以提高方位计算精度。

By the law of conservation of mass and the principle of effective stress as well as the equilibrium differential equation, an anisotropic coupled model for the analysis of groundwater seepage and stress is developed.

根据质量守恒定律、有效应力原理、以及土的平衡微分方程建立了各向异性渗流场与应力场的耦合分析的数学模型。

Based on momentum balance and the law of momentum conservation, two new graphic methods are developed to determine the pre-impact vehicle momentum or collision speed in this paper.

本文根据动量平衡和动量守恒定律的基本原理,提出了两种推算碰撞前汽车动量或碰撞速度的图解方法。

The decay of effect of a self-equilibrated system of forces in chain model is decided by the convergence of operator continued fraction, so the reasonable part of Saint-Venant's principle is described as the convergence of operator continued fraction.

平衡力系的影响在链式模型上由近及远的衰减受算子连分式的收敛性的控制,所以圣文南原理的合理成分体现为算子连分式的收敛性。

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In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国,慢性酒精中毒,肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题,你可以随时联系我。

Very pretty, but the airport looks more fascinating The other party wisecracked.

很漂亮,不过停机坪更迷人。那人俏皮地答道。