查询词典 periodic

Theoretical analysis showed that under well specified conditions, electromagnetic slow wave can interact stationary with moving periodic structure ,based on that the a working principle can be proposed for a class of MEMS motor and actuator.

理论分析表明，在特定的条件下，电磁慢波与运动周期结构之间可以发生稳定的相互作用，这能够成为一大类MEMS电机或执行器的一种不同的工作原理。

Periodic Table Ⅶ B family steel gray with metallic luster of the solid metal transition elements.

元素周期表中ⅦB族钢灰色有金属光泽的固体金属过渡元素。

There is no reason to believe that a sterilizer operating within validated parameters for physical operation should require periodic biological challenge testing.

没有道理相信，在已验证的参数范围内运行的灭菌器还需要定期的生物挑战测试。

When ultra-light materials with periodic micro-structures are manufactured and applied in engineering,there always exist stochastic variations in matrix materials,topology and size of microstructures,etc.

具有周期性胞元的超轻质材料在制造和应用过程中，不可避免地会出现基体材料、微结构拓扑和尺寸的随机性变化。

Computer micro-vision, Mirau microscopic interferometry, stroboscopic photography and laser Doppler vibrator are integrated into this platform. In-plane and out-of-plane periodic motion characteristics of micro-resonator are measured, and out-of-plane transient motion of micro-mirror is analyzed. In-plane displacement, motion phase and resonance frequency can be measured by integrating computer micro-vision with stroboscopic photography, and the repeatable accuracy of in-plane displacement is 30 nm.

实验结果表明，利用计算机微视觉和频闪成像技术能够实现微结构的平面位移、运动相位及谐振频率等周期运动参量的测试，位移的重复精度为30 nm；利用显微干涉和频闪成像技术可实现微结构的离面位移及表面扭曲等周期运动参量的测试，位移的重复精度为3 nm；激光多普勒测振技术具有在频域上对微结构瞬态运动进行分析的优点，是时域上周期运动测试的重要补充。

Out-of-plane displacement and tolerance can be measured by integrating Mirau microscopic interferometry with stroboscopic photography, and the repeatable accuracy of out-of-plane displacement is 3 nm. Laser Doppler vibrator has an advantage of analyzing the motion in frequency domain, and it is the complementarity of measuring periodic motion in time domain.

标 签 光学测量微结构动态特性计算机微视觉米劳显微干涉频闪成像激光多普勒测振 optical measurement micro-structure dynamic characteristics computer micro-vision Mirau microscopic interferometry stroboscopic photography laser Doppler vibrometer

Using the discrete dynamical system determined by the stroboscopic map, an exact 1-periodic solution of the system which is with Beverton-Holt function and the threshold conditions for its stability are obtained.

运用由频闪映射决定的离散动力系统，得到了具 Beverton-Holt 功能函数系统的精确1-周期解，并讨论了它在临界条件下的稳定性。

However, for the most cases, the classical Melnikov method can merely show the existence of subharmonic periodic orbits.

但是在大多数情况下，经典的Melnikov方法往往只给出存在次谐周期解的结论。

In this paper, by using the notable Mountain Pass Lemma of critical point theory, some sufficient conditions for the existence and multiplicity of periodic and subharmonic solutions to a class of second order nonlinear functional difference equations with Jacobi operators are obtained.

论文研究了一类具有Jacobi算子类型的二阶非线性泛函差分方程(1)的周期解和次调和解的存在性与多重性。首先将方程（1）的解的存在性问题转化为某个泛函临界点的存在性问题，然后验证此泛函满足著名的山路引理的条件，从而得到论文的主要结论。

In the last two sections of this chapter,we give two applications of the new Z_p geometrical index theory to the existence of periodic solutions and subharmonic solutions for a class of wave equations with deviating arguments.

在本章中，我们还给出广义Z_p几何指标理论在含有偏差变元的波动方程中的应用，得到周期解与次调和解存在(来源：12e2ABe9C论文网www.abclunwen.com)性的两个结果，即使对正常变元的波动方程，这些结果也是新的。

No clear conclusions can be made about the predictie alidity of specific measures, they found, except for criteria for the underuse of drugs for cardioascular disease.

除了心血管病不合理用药标准外，对于特定评价方法的预测效度没有明确的结论。

The third and last is that almost all of them, being infinite in number, have been impostures, and by idle and crafty brains merely contrived and feigned after the event past.

第三、即最后一点是：几乎所有这些不胜枚举的预言都是欺人之谈，都是在事件过后由无聊而狡猾的脑筋推测与凭空捏造的。