可变化

Cause cupreous price gigantic a fluctuant element is numerous, but pass systems analysis, can forecast trend of cupreous price change well and truly.

造成铜价巨幅波动的因素众多，但通过系统分析，则可较为准确地猜测铜价变化趋势。

Keywords: definition, curvilinear regression analysis, point sharpness method, modulation transfer function MTF

该评价方法评价参数可通过改进边缘锐度算法得到，然后与机测MTF值的变化趋势一起做曲线回归分析，以便和其他传统清晰度评价参数做对比。

The biggest change will be battles at sea, which have moved from a tacked-on feature to being fully controllable; manoeuvring your forces as you would your troops on land, taking into account weather and water effects, and pummelling your opponents with cannon before boarding them with a cutlass in your teeth.

最大的变化将是海战，它已经脱离非得-特征被完全可控；操纵你的力量，正如你将你的部队陆，考虑到天气和水的影响，东南部和你的对手景隆登机前他们与乔治在你的牙齿。

Systems biology includes the omics, computational and synthetic biotechnology. An efficient approach, termed sequence tagged fragments display, be developed that allow for the identification of genes from differential expression tissues, and analysis of genes involved in cytogenesis and pathogenesis.

基因表达调控决定于基因序列，如启动子、非翻译RNA区、蛋白质的结构域等，系统生物学包括组学、计算与合成生物技术，序列标志片段显示，可用于细胞系分化、病理变化等基因表达语、信号传导网络的系统分析与功能基因克隆。

The effect of tribology factors on bearing vibration is studied experimentally. AR model and WPT are used to processing the normal arid abnormal signals. The results are as follows:1. The vibration of ball bearings is caused by the tribology action of contact pairs of ball and ring races and has the essential of tribo-dynamics. Any factors affecting the tribology characteristics of contact pairs will affect vibration and noise of bearings consequently.2. Vibration characteristics of bearing keep almostly unchanged with the increasing of axial load expecting the increasing of nature frequencies. When radial load increasing with axial load unchanged, nature frequencies keep unchanged but some new vibration peaks appears in the spectrum.3. Vibration amplitudes are damped and nature frequency are enhanced with sufficient lubrication. Vibration and noise of bearings increase obviously and roar can happen and the contact surfaces scratch slightly under insufficient and unclean lubrication state. Bearing will be disabled in a few minutes without any lubrication.4. Bearing vibration is unstable under low speed. With the speed increasing, the vibration become stable and natural frequencies increase slightly but the amplitudes increase apparently.5. Bearing vibration can be excited only by some harmonics ofwaviness without lubrication and by all harmonics with lubrication based on the theoretical analysis.6. The nature frequencies of ball bearings decrease with the increasing sizes. When international clearance increasing, nature frequencies decrease in radial and increase in axial and angular and the amplitudes increase in radial and decrease in axial and angular. When the number of balls increasing, nature frequencies increase and amplitudes decrease. When the pitch diameter increasing, axial nature frequency increase and others nearly keep no change. When outer race groove curvature radius increasing, nature frequencies increase in radial and decrease in axial and angular and amplitudes keep no change in radial and increase in axial and angular. When inner race groove curvature radius increasing, nature frequencies decrease and amplitudes increase.7. The distortion in amplitude and frequency components of bearing vibration signals picked up by the present probe measurement method is founded and right conclusions cannot be achieved by the signals. When accelerometer is rigidly screwed with steel stud onto a flat outer surface of a ball bearing, vibration signal can be got without distortion and the reliability of research on bearing vibration is assured.8. AR model is suitable for large samples of bearing vibration signals, square root of length of samples can be used as the upper limitation of order determination and the FPE order selection criterion is effective. Many advantages of AR spectrum are founded over the classical based on FFT.9. Time-Frequency analysis is necessary for abnormal noise of ball bearings. WPT overcomes the principle shortcomings of STFT and proved to be a best tool to process the abnormal signals.

理论分析和试验研究表明： 1球轴承振动是钢球—滚道接触副中的各种摩擦学作用引起的，具有摩擦动力学的本质，任何对接触副的摩擦学特性有影响的因素都将对球轴承的振动和噪声特性产生影响； 2中心轴向载荷作用下，载荷增大使球轴承的固有振动频率升高，载荷越大同样的载荷增幅引起的频率升幅减小，足够大的中心轴向载荷作用下载荷的变化对球轴承振动的频率特性不会产生明显的影响； 3轴向和径向联合载荷作用下，径向载荷不大时球轴承振动的固有频率基本不变，但是可能引起变刚度激励的非线性振动，出现新的频峰，过大的径向载荷将使部分钢球脱离接触，使球轴承的振动和噪声呈现不稳定状态； 4润滑对球轴承的振动和噪声特性有重要的影响，良好的润滑对振动有明显的抑制作用，润滑不充分时，振动和噪声的水平会有明显增高，一定条件下还会激发接触副中的谐振，发出啸声，造成接触表面的伤害，无润滑干接触时，短时的运转就会损伤接触副表面，使振动和噪声迅速增大，并随时可能引发严重的磨损和卡滞失效；接触副润滑良好时，油膜的"刚化效应"使球轴承振动的固有频率有所提高，润滑剂中含有弥散性污浊时，振动的幅度总体升高，但弥散性污浊不会改变球轴承振动的频率特性；浙江大学博士学位论文：球轴承振动的研究 5低速时，球轴承振动的基本特征呈现不稳定状态，随着转速的提高，球轴承振动的频率特性趋于稳定，固有频率频峰升高； 6理论分析表明，干接触时钢球和滚道表面波纹度的某些谐波分量能激励球轴承的振动，振动的幅值与谐波幅值成正比，实际球轴承中钢球的分布不可能完全均匀，波纹度的激励作用会随时发生；润滑接触的分析表明，波纹度的任意谐波分量均能激励球轴承的振动； 7球轴承的几何和结构参数分析表明，球轴承尺寸越大，径向、轴向和角振动的固有频率越低；钢球中心圆直径增大，球轴承的径向和轴向振动的固有频率基本不变，角振动的固有频率有所上升，振动的幅频特性基本不变；径向游隙加大使球轴承的径向振动固有频率降低，轴向和角振动的固有频率有所升高，径向振动幅频特性的幅值升高，而轴向和角向降低；钢球的数量增多使球轴承振动的固有频率上升，幅频特性的幅值下降，径向振动的幅值下降最为明显；外圈沟曲率半径系数增大使球轴承径向振动的固有频率升高，轴向和角振动的固有频率降低，径向幅频特性基本不变，轴向和角向幅频特性幅值升高；内圈沟曲率半径系数增大使径向、轴向和角振动固有频率均下降，振动幅频特性的幅值均有升高； 8试验对比表明，传感器采用探针式安装时，由于探针接触副接触特性的影响，钡(量得到的球轴承振动信号有失真，采用专门设计和制作的试验球轴承，以固定式安装加速度计，首次测量得到了球轴承振动的真实信号，通过对振动信号的分析，验证了球轴承振动的理论模型； 9)基于时间序列分析的AR模型适用于大样本球轴承振动信号的分析，以样本长度的均方根值作定阶上界，FPE做判阶准则，给出的AR谱光滑，频率分辨率高，是球轴承振动分析的简便而可靠的手段； 10以时频域分析的小波包变换分析球轴承异音信号能够比较好地定位和聚焦异音发生的时间，时间间隔，频率范围，同样是球轴承振动分析的可靠的手段，可用作球轴承故障诊断技术。

If we examine the structure of the Chinese language more closely, we can find it simpler in many ways than western languages. For example, the Chinese language has virtually no conjugation for its verbal and no declension for its nouns.

2如果我们仔细观察一下汉语的结构，我们便可发现汉语在许多方面较之西方语言更为简单，例如，汉语基本上没有什么动词变化形式，也没有名词变格现象。

If we examine the structure of the Chinese language more closely, we find it simpler in many ways than Western languages. For example, the Chinese language has virtually no conjugation for its verbs and no declension for its nouns.

如果我们仔细观察一下汉语的结构，我们便可发现汉语在许多方面较之西方语言更为简单，例如，汉语基本上没有什么动词变化形式，也没有名词变格现象。

It can decompound omethoate with high efficiency and even survive under 3g/L omethoate. The degradation was related to the trend of the growth of the strain dynamically.

通过对NWB-36有机磷农药降解特性的研究，结果表明，该菌对有机磷农药的降解具有遗传稳定性、广谱性和高效性，可耐受3g/L的氧化乐果，降解呈现动态变化，与菌体的生长趋势呈现一定的相关性。

The art of being unseen and thus indefinable has transformed into the art of being definable in infinite variations.

隐藏起来并因此不为人知的艺术已经转型为在无穷无尽的变化中的可被确定的艺术。

With the variety of defocus radius and magnification of object image, the moved distance and velocity of the object can be obtained.

通过运动目标图像的散焦半径与图像大小的变化，可得到目标运动的距离与相对运动速度。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！