The finite - difference time - domain ( fdtd ) method is applied to the accurate simulation of mems multilayer microstrip patch antenna . the fdtd method allows rigorous treatment of complicated structures such as unregulated shape or dielectric interface 本论文利用时域有限差分（ fdtd ）法，对一种新型的mems层叠式微带贴片天线进行了精确的时域仿真。
Utilizing timed petri net , stochastic petri net modelling tool and computer tool , simulating and analyzing integrated avionics system data bus , and attaining system time capability parameter are the studying method of the thesis 利用时延petri网、随机petri网建模工具和计算机工具，来仿真、分析航空电子综合系统数据总线，计算系统时间性能指标是本文的研究方法。
In order to effectively extract the defect signature of the vibration signal , two new methods , single gear tooth analysis ( period segmentation technique ) and time - delayed correlation demodulation , are established and experimentally tested 实验分析结果证实了时延相关解调技术是一种良好的降噪解调技术。并初步总结出了利用时延相关解调法识别滚动轴承不同故障类型的诊断特征。
The used value of doppler centroid influence the imaging result very much , so it must be estimated precisely . the estimating methods contain time domain method and frequency domain method . time - frequency analysis method can be used to improve estimating precision 多普勒中心频率的取值对成像效果有很大影响，必须精确估计，估计方法有时域方法及频域方法，还可利用时频分析方法提高估计精度是。
No analysis will be conducted on individual users . the chiayi county tourism commission is obligated to protect each applicant s privacy , and unless you agree or the following conditions are met , will not alter or delete any individual s information and files of its own accord 嘉义县观光旅游暨行政资讯网提供的内容与服务，是为了使用者个人非商业用途的使用，使用人利用时必须遵守著作权法的所有相关规定。
Therefore , the deformation has no effect on the properties of the micro - actuator using r phase transformation of tini film . however , for the micro - actuator using the martensitic transformation of tini film , the deformation strain of tini film should be less than 3 % 因此用t豆卜薄膜作微驱动器元件时，若利用时b变，可以不考虑变形对微驱动器元件性能的影响，而利用马氏体相变时， tint薄膜的最大应变应控制在3以下。
For the severe limitation that the selectivity of transient current protection will lose when the fault with small resistance or without resistance takes place at the end of transmission line , the basic reason for the selectivity loss of transient current protection was investigated 摘要针对保护出口处发生金属性或小电阻短路故障时，暂态电流保护完全失去选择性的严重缺陷，利用时域分析方法，进行了详细的故障暂态分析和仿真研究。
Under the software of matlab life - parameter signals are processed and analyzed in both time and frequency domain and then life identification algorithm is developed . finally the friendly interface of the application is developed with delphi which has a visible programming environment 利用时域、频域分析方法在matlab环境下进行生命参数信号的时、频域数据分析，生成智能生命体识别算法，利用delphi可视化编程环境设计出友好的软件界面。
The other research purpose is to discover characteristic information and reliable methods of reflecting spinal cord damage . due to typical damage indicators , amplitude and latent period , have bugs such as limited information and weak stabilities , this project recommends applying time - frequency analysis to monitoring spinal cord function . through analysing and comparing typical signal with stft and cwt , it is proved indicators under time - frequency distribution can be better in reflecting signal changes , espcially the wavelet transformation 针对目前ep监测中判定脊髓损伤的指标（波幅和潜伏期）存在信息量相对较小、稳定性较差的缺陷，本课题提出利用时频分析技术对术中脊髓功能监护进行研究，通过短时傅立叶变换和小波变换分析和比较典型信号的时频分布，证明时频特征参数能更有效的提取信号的变化信息。
The conventional variable structure control technique for uncertain system requires that the uncertainty bound is known as a premise to assure robustness . the requirement creates an over - conservative controller and enlarges chattering . the proposed controller regards the influence of unknown disturbances and parameter uncertainties as an equivalent disturbance and generates an on - line estimation used in smc to cancel the slowly varying uncertainties by the mechanism of time delay . the reaching law approach is used to get the conditions and band of quasi - sliding mode . the new methodology offers a robust feedback control with much lower gains and reduces chattering without a prior knowledge of the uncertainty bounds or matched conditions 常规变结构控制用于不确定系统，须利用不确定性界确保系统的鲁棒性，控制器过于保守且抖振变大.本文把未知干扰和参数不确定性的影响等效为名义系统的外界干扰，利用时延技术对干扰进行在线估计，并将估计值引入到变结构控制中，从而抵消掉系统中的慢变不确定性，利用离散趋近律法，推出了准滑动模态的存在条件及其带宽.该方法克服了以往控制方法中须已知不确定性界的限制，且不必满足匹配条件，用较低的控制增益保证了系统的鲁棒性，降低了准滑动模态带即削弱了抖振
