不值

Based on the invariance of maximum likelihood estimation, the sufficient and necessary condition under which the maximum likelihood estimation has invariance for the parameters are given, then it uses this conclusion to calculate the maximum likelihood estimation of σ^2 and ρ for bivariate normal distribution.

根据参数极大似然估计不变性原则，给出在一定条件下极大似然估计具有不变性的充分必要条件，并利用该结论计算了二元正态分布Z=的未知参数σ^2和ρ的极大似然估计值。

The proposed method has the merit that the numerical characteristics of stochastic temperature field response can be obtained by analyzing the random temperature field just in one time.3. Perturbed numerical algorithm of nonprobabilistic convex set theoretical models on the temperature fieldThe uncertain parameters of physical parameters and initial boundary conditions of heat conduction are described by the convex model. The perturbation formulas of the upper and lower bounds of temperature field response with unknown-but-bounded parameters are given via the combination of matrix perturbation theory and the convex set theory model.4. Numerical analysis for transient temperature field with interval parametersConsidering the uncertainties of the transient heat transfer, the physical parameters and initial boundary conditions are regarded as interval variables.

该方法具有只进行一次随机温度场分析便可以获得其响应的数字特征的优点。3、温度场的非概率凸集合理论模型的摄动数值解法将结构导热的物理参数、温度场的初始和边界条件等不确定性参数以凸模型加以描述，基于矩阵摄动理论和处理不确定问题的凸集合理论模型的结合，导出有界不确定参数瞬态温度场响应所在集合的上、下界摄动计算公式。4、具有区间参数的瞬态温度场数值分析考虑结构瞬态热传导问题的不确定性，将结构各物理参数和温度的初、边值条件均视为区间变量。

This paper considered the existence of solutions to boundary value problem of several kinds of nonlinear sys...

本文利用锥理论，不动点理论，Krasnoselskii不动点定理等研究了两类奇异微分方程非线性边值问题解的情况，得到了一些新成果。

The calculation of power factor is according to ratios of real power and total power. Lower power factor electric equipment representative have unnecessary busywork and harmonic components.

功率因数值的计算是根据实际消耗功率与视在消耗功率的比值为基准，因此功率因数不佳的电力设备即代表存在著不必要的虚功以及谐波成份。

The result indicates that the high pH concrete pore solution can reduce corrosion of Cl~ on the carbonize steel.

结果表明，高pH值的混凝土孔隙液能减缓氯离子对碳钢的腐蚀；当pH≥13.6时，在NaC l浓度小于3%的混凝土孔隙液中，碳钢表面因生成钝化膜而不被腐蚀；当pH≤9时，混凝土孔隙液中无论是否存在C l-，碳钢均会被腐蚀；当pH=12.5时，混凝土孔隙液中NaC l浓度小于0.05%，碳钢则不被腐蚀；当混凝土孔隙液中的C l-浓度达到临界氯离子浓度时，碳钢表面的钝化膜开始损坏而被腐蚀，碳钢的腐蚀速度随着C l-浓度的增加而增大。

Using the diffusion coefficient obtained from the 400mg/L chlorophenol experiments, the model was able to predict the sorption kinetics of chlorophenol onto soil at different concentrations, indicating that the model is appropriate for describing the transport of phenol and chlorophenol within the two soils.

其中，第一种模式系假设土壤颗粒大小在实验过程中并不会随时间改变，计算求得之孔隙扩散系数约在8.3*10/sup -8/cm/sup 2//sec至2.9* 10/sup -7/cm/sup 2//sec附近，曲折度约为33-125，虽然曲折度和文献值相近，但因粒径不随时间变化的假设与实验所观察到的结果不符，所以此部分的结果较不具合理性。

Improve pixel camera, the digital interpolation to increase ordinary resolution would be tantamount to fraud, in the definition and image quality without any improvement; On the other hand to improve the image quality and resolution, the amount of data is bound to geometry class increase the number of not only USB protocol can not keep up the speed of data transmission, data transmission networks also can not keep up.

摄像头提高像素的话，一般通过数字插值提高分辨率，这就等于弄虚作假，在清晰度和图像质量方面没有任何改进；另一方面若要提高图像质量，提高分辨率，数据量就必然几何级数地增加，不但USB协议的数据传输速度跟不上，网络数据的传输更跟不上。

Will see this new value and not clobber our data.

当用户程序检查它的break，它将会看到新值，而不会破坏我们的数据。不太明白这里的意思？

The influence of various stories in the model structures on the structural influence factors were evaluated by performing the pushover analysis of the concentrically K-braced frames.

通过对K形中心支撑钢框架的pushover分析，考虑不同层数对结构影响系数的影响，对6、9、12层中心支撑钢框架进行了分析，得出在不同层数下的结构影响系数，为结构影响系数的取值提供参考。

Conductometer calibration: calibration is carried out for each range of measurement to be used, after disconnection of the conductivity cell, using certified precision resistors or equivalent devices with an uncertainty not greater than 0.1 per cent of the certified value.

电导率仪校正：测量所使用的每一个范围都应被校正，拆下电导池之后，使用被鉴定的精密电阻器，或带有一个不确定度不超过鉴定值0.1%的同等设备。

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％。