平方

There was linear correlation between sICAM-1 and tIgE (R-square=0.502,standard partial regression coefficient=0.097,t=2.841,P=0.021 8) with stepwise regression analysis.

结果 血清sICAM-1、sVCAM-1、tIgE水平测定哮喘组均高于对照组(P＜0.01)；血清中以户尘螨和蒿草花粉的特异性IgE含量增高为主；经多元逐步回归分析提示血清总IgE含量与sICAM-1存在线性关系，其复相关平方为0.502，标准偏回归系数为0.097，t＝2.841，P＝

The law of universal gravitation /states /that every particle of matter in the universe/ attracts /every other with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

万有引力定律是指宇宙中的物质粒子之间在压力下相互吸引，这种压力的大小与它们的质量的乘积成正比，与它们们之间距离的平方成反比2 请将下面的句子翻译成中文。

The PID parameter tuning of non-linear control system is set as the engineering background. The aim is the optimal design of PID parameter. On the basis of the design and research of the advanced PID parameter tuning, the mathematical model-transfer functionis developed through correlation analysis on statistical method.And with the optimization algorithm under constraint condition, the non-linear, Isqnonlin is set as object function. Then with connection of the non-linear constrain optimization algorithm and simulink technique, a set of adjust parameters which fit the performance index of the control system are found. And optimization design process and steps are provided.

本文以非线性控制系统PID参数整定为工程背景，以PID参数的优化设计为目标，在分析和研究国内外PID参数先进整定方法的基础上，运用相关分析实验统计方法建立对象的数学模型——传递函数，把PID参数设计问题转化为一种非线性优化设计问题，借助于约束条件下的优化算法，以非线性最小平方指标为目标函数，将非线性约束优化算法同Simulink仿真技术相结合，找出符合控制系统品质指标的一组调节参数。

I have seen a steamboat with a Pearl engine using a 25 sq. ft. boiler.

我看到汽船与珍珠引擎使用了25平方呎锅炉。

On the basis of the principle of the least-squares approximation and steepest descent method and the average of the given discrete points, the space linear fitting can obtained, at the same time through a test proved the algorithm is correct.

其中空间直线拟合根据最佳平方逼近原理和最速下降法以及所给离散点的均值求得，并通过试验验证了此算法运算结果的正确性。

For example, cars in the National Association for Stock Car Auto Racing, or NASCAR, are no longer festooned with logos over every square inch.

例如，全国运动汽车竞赛协会（National Association of Stock Car Auto Racing，NASCAR）[注5]的汽车车身上不再每平方英寸都贴满标志了。

In Jerusalem, every square inch of the stony ground is covered in history.

在耶路撒冷，每一平方英寸的石头地都有历史痕迹。

In the present paper,a sharp inequality is obtained between the Ricci curvature and the squared mean curvature of semi-invariant submanifold s in cosymplectic space forms,and some conditions are reached to make the equality hold.

对余辛流形的半不变子流形进行研究，利用曲率的分量表示之间的简单的代数关系，得到了这类子流形的R icc i曲率与平均曲率平方之间的一个不等式，并讨论了等式成立的充分必要条件

On this basis, we consider a class of suboptimum detectors for the asynchronous SSMA system whose decision algorithms consists of a linear transformation followed by a set of threshold devices.

在此基础上，针对随机多址扩频通信系统的情况，分别提出了两种线性检测器—最小均方误差检测器和加权最小平方检测器，以及一种非线性检测器—判决反馈检测器，给出了它们的实现原理和方法。

One half of the time average over the sum of the squares of The differences between successive readings of the frequency deviation sampled over the sampling period.

取样期内，被采样的频率离差的连续两次读取差值的平方总和。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。