不能变换的

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。

Therefore,the Lorentz Transformation is invalid and Einstein's special relativity theory,which is based on the Lorentz Transformation,is questionable.

另一方面，立足于普适的同时性的经典伽利略变换却能赋予电磁场方程和电磁波方程以不变性。

In the currently do not have to RIP imagesetter output software and be subject to any adjustment of the output film's site density value test results we can achieve business card printing and membership card making demands, which means the current RIP software and a parameter of the setter is in line with the current business card printing and membership card production requirements, are not required to be made of the relevant parameters are tuned, you can direct the output of a film that you want to test the value dot, and in the RIP software to convert "" gray-scale parameter is set to ensure that design business card printing and membership card production suites in a color swatch dot value and imagesetters actual output of the dot matches a color swatch.

在长远不有有差RIP输入软件和激光照排机举动任何调动的环境下，如果差所输入胶片的实地密度值尝试甘休能不亏到达制卡和会员卡制息的给求时，这表明长远的RIP软件与照排机的参数是相符长远制卡和会员卡制息给求的，不离不需给再差一些不关的参数举动调动了，可以间接差所输入的胶片举动网点百分比值的尝试，并在RIP软件洋举动"灰度变换"参数的撤销，以包管在安排制卡和会员卡制息版面时的各色块网点百分比值与照排机本质输入时的各色块网点百分比值分歧。

In the currently do not have to RIP imagesetter output software and be subject to any adjustment of the output film's site density value test results we can achieve business card printing requirements, which means the current imagesetter RIP software and is in line with the parameters of the current business card printing requirements, are not required to be made of the relevant parameters are tuned, you can direct the output of a film that you want to test the value dot, and in the RIP software to convert "" gray-scale parameter is set to ensure that design business card printing suites in a color swatch dot value and imagesetters actual output of the dot matches a color swatch.

在长远不有有不差RIP输入软件和激光照排机举动任何调动的环境下，如果不差所输入胶片的实不天密度值尝试甘休能不亏到达制卡的给求时，这外明长远的RIP软件与照排机的参数是相符长远制卡给求的，不离不需给再不差一些不关的参数举动调动了，可以间接不差所输入的胶片举动网不面百分比值的尝试，并在RIP软件洋举动"灰度变换"参数的撤销，以包管在安排制卡版面时的各色块网不面百分比值与照排机本质输入时的各色块网不面百分比值分歧。

The characteristic vector of the real symmetric matrix should be found out, which is orthogonalized and normalized to a standard orthogonal base and is used as row vector to construct the transformation matrix P, so the P~(-1)AP can be made into diagonal matrix.

实对称矩阵A经相似变换P-1AP可化为对角矩阵，在x =Py 下，不一定能化A的二次型为标准型；应寻求对称矩阵A的特征向量，将其正交化并单位化作为标准正交基，作为列向量构造变换矩阵P，可使P-1AP=Λ为对角阵，在x =Py 下，要将二次型化为标准型，且二次项系数即为对角阵Λ主对角线上元素。

Classical Top-Hat transform only uses structure element in one size and can not effectively extract objects in the image, because only part of objects may have a high response for a given structure element size and a lower response for the rest.

经典的Top-Hat变换用唯一尺寸的结构元素对图像进行处理，并不能有效地提取目标，图像上面的结构或目标不一定对那个尺寸的结构元素敏感。

Results show that, by uv-vis spectra, fluorescence spectra and Fourier infrared spectra transform all successfully gained water-soluble CdTe quantum dots. With the increase of water-soluble CdTe quantum dot concentration increasing, Achyranthes Bidentata root length and the seed vigor reduced ordinally, but its germination changed no obviously, suggested the space mutagenesis treatment can improve Achyranthes Bidentata seed vigor.

结果表明，紫外－可见光谱、荧光光谱和傅立叶红外变换光谱图均说明已成功制备水溶性CdTe量子点；随水溶性CdTe量子点浓度增大，牛膝的根长和种子活力依次降低，但其对发芽势影响的规律不明显，经空间诱变处理能提高牛膝种子活力。

In degraded PSM matching classification, errors modification method of degraded PSM is presented and the matching tensor of every canonical scattering centers is given. In Chapter 4, the theory of wideband millimeter-wave radar target identification is introduced. It is indicated that, for HR radar target identification, description of temoral relations among features and pattern recogntion adaptive to variation of target angles are of key importance. A rule-based pattern recogniton method of sequential reasoning is proposed, which uses a series of rules to describe relations of features variation caused by target angles variation and has the advantages of adaption to unrandom variation and false probability control in classification over traditional statistical pattern recognitiop method. Feature extraction is crucial step in target identification. In range profiles identification application, features are extracted by means of range domain pre-processing algorithm, spacial and amplitude visual computation directly from range profiles and transform algorithm based on range profiles. Visual or transformed features are either sufficiently convinced or necessarily convinced and both of them are effective and robust to range profiles identification.

在第四章，首先对宽带毫米波体制背景下目标识别方法的一些特点进行了阐述并指出，在毫米波雷达目标识别中，特征之间动态关系的描述以及能适应目标姿态角变化的模式识别方法的研究乃是要解决的关键问题；进而提出了一种基于规则库的序贯推理模式识别新方法，在这种方法的研究中，主要包括序贯推理规则库的规则排列与特征选用顺序以及规则库的收敛等问题；这种方法克服了传统的统计模式识别方法特征利用效率不高、难以适应特征值的非随机性变化的缺点，把姿态角变化所引起的特征的变化用一系列规则加以表示，其优点是能适应特征值的非随机性动态变化，并能控制分类过程中的差错概率α；特征抽取是目标识别中的关键步骤，在基于目标距离像的特征抽取方法研究中，提出了距离空间域的预处理算法、距离空间域与幅度域的直观特征抽取方法以及基于目标距离像变换分析的特征抽取方法。

Then the paper presents a novel-working mode of Boost-Forward single-stage Power Factor Correctors based on the analysis. And get the principle of the conduction mode and the method to control the voltage of the buck capacitor after the analysis of the boundary mode of the PFC converter and the DC-DC converter.

在此基础上，本文首次提出了一种全新的临界工作模式下的单级功率因数校正电路，在对PFC变换器及DC/DC变换器工作在连续及不连续的边界条件进行了讨论后，得出了电路工作状态的精确解并提出了控制储能电容电压的临界点工作方式。

The transformed systems need not to have special forms and there are no restrictions on the types of nonlinearity contained in systems. The only requirement is that the two matrice defined in the paper should be a controllable pair at every point.

它不要求线性化微分同胚变换后系统具有特定形式，对系统所含非线性也不作限制，它只要求变换后系统的两个特定函数矩阵在点点均为能控对。

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％。