计量

In order to represent accurately and concisely the changing characteristics of one-dimensional spectrum density function in the chatter development. This thesis, for the first time, proposes the Edgeworth asymptotic expansion formulas of spectral density. A detailed proof is given. Some new statistic including spectral skewness, spectral kurtosis and spectral cumulants are proposed.

为了准确、简洁地表达一维谱密度函数在切削颤振建立过程中的变化特征，论文首次建立了一维谱密度函数的Edgeworth渐近谱展开式，给出了详细的证明；并由此提出了"谱偏态系数"、"谱峰态系数"和"谱累积量函数"等新的谱统计量。

Describes general methods of point and interval parameter estimation and the small and large sample properties of estimators: method of moments, maximum likelihood, unbiased estimation, Rao-Blackwell and Lehmann-Scheffe theorems, information inequality, asymptotic relative efficiency of estimators.

点估计和区间估计的一般方法，估计量的小样本和大样本性质：矩法，极大似然估计，无偏估计，Rao-Blackwell 和 Lehmann-Scheffe 理论，信息不等式，渐进相对有效估计量。

Maximum likelihood, unbiased estimation, Rao-Blackwell and Lehmann-Scheffe theorems, information inequality, asymptotic relative efficiency of estimators.

点估计和区间估计的一般方法，估计量的小样本和大样本性质：矩法，极大似然估计，无偏估计，Rao-Blackwell 和Lehmann-Scheffe 理论，信息不等式，渐进相对有效估计量。

The results show different factors in this process such as reactant ratio, atmosphere pressure etc.

结果表明，反应物投料比例，合成气氛压力等因素对合成产物化学计量配比有显著的影响。

After applying the Phase-randomized surrogate algorithm to create surrogate data, three test statistics methods, which include KS test, the third-order autocovariance and the asymmetry due to time reversal, are employed to determine nonlinear of five kinds signals.

通过对各类信号的数值实验及与传统使用的高阶自相关量以及时间反演不可逆量对比结果表明，KS检验是一种有效、稳定的非线性检验统计量，对噪声信号具有较强的抗噪能力，而对非线性信号具有较高的敏感性。

With the interface software, the basic data from GIS system and the running data from automatic computation system or from SCADA system can be conveniently formated to the standard database needed by the loss calculation software. According to the data, many flexible measures are taken to avoid the manual data input process and make the calculation result closer to the real value.

该软件通过对GIS系统、计量自动化系统和SCADA系统中各类数据结构的详细分析，制定了数据交互规则，并针对相关数据库的实际情况实现了若干灵活处理，既避免了手工录入数据的繁琐过程，又使线损计算结果能够适应运行需求。

Industrial residue is combined with coke dust to produce granular materials that is transferred to liquation furnace for high - temperature processing after automatic computation and proportioning , and the melt is processed to be fiber by fiber machine , then after containing dust , floatation deslagging, shot separation and modification processing , whitening and dehydration , which the fiber is pressed to inorganic fiber for paper making in vacuum condition and the product is weighed,packaged and put in storage automatically .

工业废渣配焦炭粉造粒料，经自动计量配比后送熔化炉高温处理，熔化液经成纤机加工成纤维，再经集尘，气浮除渣，渣球分离及改性处理后，漂白脱水，真空压榨成造纸用无机纤维产品，自动称量包装入库。

The article utilizes vector autoregression model, the new method of the time series econometric method, to solve the problem.

本文采用了一种最近发展的研究时间序列经济计量学的新方法——向量自回归模型。

In the second,third and forth section, we use Vector AutoRegression model, Granger Test of Causality and Pearson simple correlation to process the data set.

第二步，我们利用经济计量学中的向量自回归模型、格兰杰因果关系检验模型和pearson相关系数法对数据进行分析处理。

Through the international cooperation the metrologists are striving to redefine the mass standard depending on unchanging properties of nature based on the concept of Avogadro constant and Planck's constant.

近年来，计量学家通过国际合作，试图基于自然的不变性质、阿佛加德罗常数和普朗克常数的概念重新定义质量基准。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。