差

Analysis of the feature and geometry of the normal compaction trend is used to establish the compaction trend with polynomial of degree 2 or 3 or polygonal line, and to predict the distribution of geopressure using the method of seismic transit time deviation -pore pressure gradient in Yinggehai bas.

研究了压力预测的方法，推导地震声波时差差值—压力梯度法的计算公式并指出它的优点是能够充分利用已知的钻井实测压力资料；从理论上分析了正常压实趋势线的性质和形态，并用2~3次多项式和分段函数建立正常压实趋势线；根据莺歌海盆地高温高压及沉积速率高、泥底辟发育的特征，建立合理的压实趋势线，并用声波时差差值—压力梯度法预测了莺歌海盆地的压力分布。

This paper introduces a time series model whose determined trend is polynomial and errors are autocorrelated and heteroscedastic as sunspot series model.

用确定性趋势与残差服从条件异方差模型的自回归模型组合，作为太阳黑子相对数的数学模型。

But the government says most of their crop is in poor or very poor condition.

但政府方面说，他们的大多数粮食质量很差或极差。

Now traffic poor, poor law and order, then it has been on the line all get together to do?

现在交通很差、治安很差，于是人们又反省，把大家弄在一起到底行不行？

Second, a portfolio selection model under constraints of both investment chance and VaR is established.

第一章介绍了标准的均值—方差模型及"均值—方差有效集"的性质，给出了投资机会约束和VaR约束的定义。

Second it is proved that there are strong heteroscedasticity in the sunspot series by Portmanteau Q test and Lagrenge test.

然后通过Portmanteau Q检验和Lagrenge乘子检验证明残差存在强烈的异方差性，表明仅仅用多项式趋势－自回归校正模型是不够的。

The standard deviation is the variance positive square root, the formula ...

标准差是方差的正平方根，公式。。。

The positive square root of the variance is called the standard deviation.

方差的正的平方根叫做标准差。

When some parameters undergo the nonlinearity model, this algorithm can exactly present the posterior distribution, which is able to make full use of sensor measurement message every time, and optimize measurement variance.

按实际的非线性模型演化时，该算法能够很好地对非线性函数的后验均值与方差进行拟合，并充分利用了传感器每次量测带来的信息并进一步优化了测量方差。

The value of 309 is the difference between 6942 and 6633, the yields at potash application levels of 120 and 60 kg/ha, respectively.

其中，309是6942与6633之差，它们是钾肥用量分别为120和60公斤/公顷时的相应产量，60是120与60之差。

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％。