同时估计

A new technique is presented in this paper for frequency estimation of single real sinusoid at a low computational cost using the real parts or imaginary parts of Fourier coefficient s.

提出了一种利用信号离散傅里叶变换系数的实部或虚部来构造频率修正项的新算法，算法只需傅里叶系数的实部或者虚部的最大值附近的3个DFT系数来构造频率修正项，避免了复数运算从而有效减少了运算量，同时算法的频率估计精度接近CRLB(Cramer-Raolow bound)。

By the partial estimate principle established in Ref. [46] and the special structure of the self-similar sets, we can get a better upper bound of the Hausdorff measure by means of a better covering set.

主要是利用文[46]中的部分估计原理，同时结合所考虑的自相似集的特殊结构，寻找一个较好的覆盖集合，得出其Hausdorff测度的一个上界。

It is proved by means of homogeneous finite Markov chain analysis that NS-LDSE is convergent to the global optimum for any chosen initial population. Meanwhile, the convergence speed of NS-LDSE is estimated by means of Markov stopping time.

利用随机过程的相关理论，本文讨论了LDSE算法的收敛性，证明了NS-LDSE所生成的种群Markov序列收敛于最优种群，且与初始种群的选取无关；同时给出其种群Markov序列首达时间的一个上界估计。

At first, with the low-frequency data measured, three of the LRE fault detection systems for the real-time condition are proposed using the nonlinear identification technology of the BP neural network, the state estimation technology of the dynamic neural network, and the pattern recognition technology of the fuzzy hypersphere neural network. The learning algorithms of the BP and dynamic neural network are researched at the same time. Furthermore, while the engine operation is divided into the start and steady-state processes, the real time ability, the response time, the accuracy, the robustness, the sensitivity and the monitoring parameter optimization are studied. In the test data analyses of the YF-75 engine, the detection system correctly carried out for all normal tests, and in the three abnormal tests the engine faults were accurately forecasted.

首先，基于低频测量数据，采用BP神经网络的非线性辨识技术、动态神经网络的状态估计技术及模糊超球神经网络的模式识别技术，提出了三种发动机故障实时检测系统；同时研究了BP神经网络和动态神经网络的学习算法；另外还把发动机工作分为启动过程和稳态过程，分别讨论了神经网络故障检测系统的实时性、及时性、准确性、鲁棒性、敏感性及参数优化问题；在YF-75发动机试车数据分析中，不仅全部正确地监测了正常试车过程，而且准确地预报了三次异常试车中的发动机故障。

Using the method of linear response theory in lattice dynamics on the basis of Tyson's model, the response displacements of atoms on cleavage plane at the incipience of brittle fracture was derived and an expression for evaluating brittle fracture surface energy of metals was found.

本文在Tyson模型的基础上，应用点阵动力学线性响应的理论方法，导出了脆断发生时解理面上原子的响应位移，并进而给出金属脆断表面能的计算公式。这种处理方式既保持了解理断裂面是结晶的表现，避免了局域"熔化"和"沸腾"模拟脆断的简单模型中出现的非晶化问题，也对解理面上原子临界位移做了合理估计，避免了人为规定临界位移的随意性，同时，从理论上得出的脆断时产生的声发射信号与实际探测到的量级相近。

Base on the analysis, an improved training symbol with symmetric and repetitive structure is proposed, and the estimate range of the frequency offset is enlarged by increasing the number of repetitive sequence and shortening the interval of repetitive sequence.

在此基础上，提出了一种改进的训练符号结构，即在SC算法重复结构的训练符号中引入共轭对称结构，同时通过增加重复序列的数目，缩小重复序列之间的间隔，进一步扩大基于单个训练符号的频偏估计范围。

At the same time, the result of estimation the indetermination degree to calculation values and experiment values was carried on.

同时论文对所有的测量和计算结果进行了不确定度估计。

A: I'll do that. Meanwhile, could you give me an indication of price?

我会的，同时你能给我一个估计价格吗？

Meanwhile, would you give me an indication of price?

同时，你可以给我一个估计价格吗？

In chapter 3, Jordan derivations and Jordan isomorphisms of nest algebras are investigated. It is proved that every Jordan derivation of nest algebra is an inner derivation. Every Jordan isomorphism between nest algebras is either an isomorphism or an anti-isomorphism. Finally, a norm estimate for derivations of nest subalgebras of von Neumann algebras is given, and it is shown that every nest subalgebra of factor von Neumann algebras has property AIP .

第三章研究了套代数上的Jordan导子和Jordan同构，证明了套代数上的每一个Jordan导子都是内导子；套代数之间的每一个Jordan同构要么是同构要么是反同构；最后给出了因子von Neumann代数中套子代数上导子的一个范数估计，同时也证明了因子von Neumann代数中的任何一个套子代数都具有AIP性质。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失