查询词典 perturbation parameter

the electrode system is one of the most sensitive and crucial parts in eit system.in this paper a method for eit electrode structure and parameter optimizing design,taking example for compound electrode,has been presented,which is based on the coercive equipotential node model of the line electrode.an imitation research plat-form of electrode structure and parameter optimizing design has been developed.by the methods,the variety influ-ences of electrode structure and parameters on reconstructed image and measurement sensitivity can be obtained.this will provide theory basis for the electrode construction optimizing design of real eit system.

eit电极系统是整个eit系统最为敏感和关键的部分之一。本文在线电极强制等势点模型的基础上，以复合电极为例，提出了一种电极结构及参数优化设计方法，并建立了电极结构参数优化设计仿真研究平台。可针对不同电极结构和各种参数变化给出其对eit成像质量和检测灵敏度的影响，进行优化设计，从而为实用化eit系统电极结构设计提供理论依据。

A novel method for monitoring the state of transformer windings by identifying parameter of leakage inductance is presented in this paper, using Least Square techniques based on the equivalent equation of transformer leakage inductance. The mathematical model is derived for on-line identification of winding electrical parameter.

以变压器漏电感方程作为绕组参数在线计算的模型，提出了一种利用最小二乘算法进行绕组漏电感参数实时辨识从而实现绕组变形在线监测的方法，推导了用于变压器漏电感参数辨识的方程，针对参数的不可辨识问题提出了解决方案，分析了辨识结果产生误差的原因。

This method combines the information of output tracking error with the parameter estimate error in constructing the adaptation law, which gives a better result in parameter estimation than that from the traditional ARC.

该方法同时采用了输出误差与参数估计误差的相关信息构造自适应律，具有比常规ARC更好的参数估计效果。

The major results are summarized as follows: When there is initial error only or model parameter error only in the Lorenz system, the error growth and predictability limit are comparable between two kinds of error problems. This result holds basically for the wide range of parameter space of Lorenz system.

结果表明：在初始误差和参数误差单独存在时，系统的可预报期限随误差大小的变化规律基本上相同；对于相同的误差大小，初始误差和参数误差对系统可预报期限的影响几乎相同，这一结果基本上不随参数范围的变化而变化。

Parameter identification and load identification on basis of frequency-domain are all researched very well, while the error of truncation, which is brought by data conversion, can"t be avoided. So, how to avoid these errors and identify the structure"s modal-parameter and exterior-load accurately will be the key technique of this field in the future, and some research work shall be done in time-domain.

针对模态参数辨识、动态载荷识别的频域方法较为成熟，但频域法中数据变换带来的截断误差却无法避免的现状，着重对模态参数辨识，尤其是动态载荷识别的时域方法作了一定的探讨。

Through to digital simulation operation observation and design of course of model , get simulation output parameter and essential feature of system, so as to estimate and infer the true parameter of the real system and true performance.

通过对数字仿真模型的运行过程的观察和设计，得到被仿真系统的仿真输出参数和基本特征，以此来估计和推断实际系统的真实参数和真实性能。

The model and parameter accuracy are essential for excitation system modelling and parameter idenfication, and the criteria of testing the vadlity is given too.

模型和参数的精度是发电机励磁系统建模和参数辨识的关键，本文提出评判基于现场测试得出的数学模型和参数正确性的方法。

Uses MATLAB software to carry on the computation to 6×4 the contractor power efficiency,discovers automobile each related parameter to the power efficient influence rule,determined the influence power efficient various essential parameter,through adjusts each kind of correlation disposition to achieve improves the entire vehicle power efficient goal.

采用MATLAB软件对6×4重型牵引车的动力性经济性进行了计算，确定影响动力性经济性的各关键参数，通过调整各种相关配置达到改善整车动力性经济性的目的，并通过整车道路试验验证计算结果，采取优化措施改善整车的动力性经济性。

A new technology, Supercritical Fluid CO_2 Extraction, was also supplied to study the plant. The technological parameter was optimal. Total extract of SFE-CO_2 were 4.86 times of the essential oil extracted by SDE, main active extracted constituents were 1.36% high than SDE. The chemical constituents of SFE-CO_2 were also analyzed by GC-MS. 57 constituents were identified, 29 constituents of them were first discovered. 24 constituents were discovered in two extract. Fingerprint is a good technology to elevate the quality of herb medicine. The main active fraction can be extracted by SDE and SFE, Fingerprint was studied respective, chromatographic parameter was acquired. 22 peaks were assigned common peaks in the spectrum of essential oil, 17 peaks were assigned to common peaks in the spectrum of SFE extract.

采用现代共性关键技术超临界CO_2萃取技术，通过正交试验，优选了超临界CO_2提取牛至挥发油的工艺，并与传统的水蒸气蒸馏法进行了比较研究，结果显示：前者提取有效部位的收率为后者的4.87倍，主要有效成分的转移率是后者的1.36倍；采用GC-MS分析方法和NIST质谱库检索，对SFE和SDE所提化学成分进行比较，SFE分离鉴定了57种化合物，占提取物总含量的86.96％，其中29种化合物为首次从该植物中鉴定；后者分离鉴定了69个化合物，占提取物总量的98.28％，其中27种化合物为首次从该植物中鉴定；两种方法的提取物中共有成分25种，包括主要有效成分麝香草酚、香荆芥酚、对聚伞花素等。

We make the following assumption for When 2 is positive definite matrix, different estimators about matrix of regression coefficients and inefficiency of Least squares estimate have been discussed in many documents. Considered 2 is nonnegative definite matrix, this thesis derives Best linear unbiased Estimate of parameter matrix B and estimable parameter function KBL under the meaning of matrix nonnegative definite and the property of maximum probability of BLUE is investigated.

当∑＞0时，众多文献讨论了回归系数阵的各种估计及LSE的有效性，本文考虑了当∑≥0的情形，给出了回归系数阵B及其可估参数函数KBL的在矩阵非负定意义下的最优估计，研究了它的一个最大概率性质，并且讨论了最小二乘估计成为最佳线性无偏估计的充分必要条件，在此基础上给出了均值矩阵的最小二乘估计与BLUE的偏差估计，定义了LSE相对于BLUE的一个相对效率，并给出了它的界。

The small blue capacitor has very high chances to go fully shorted compare to electrolytic capacitor which is very rare.

小蓝电容器具有很高的机会去充分地缩短了比较电解电容器，这是非常罕见的。

In the Italian campaigns of 1513 and 1515, when the Swiss won the victories of Novara and Marignan, he acted as army chaplain.

在意大利的运动， 1513年和1515年，当瑞士赢得了胜利，诺瓦拉和marignan ，他担任军队的牧师。