本质

PsCdc2 might be involved in primary hyphal growth and haustorium formation during early infection by regulating cell cycle of Pst. The present study would be helpful for understanding the essence of cell cycle control and provided basis for new chemical control of Pst.

本文首次报道了小麦条锈菌的Cdc2基因，为进一步揭示条锈菌细胞周期调控的本质及研究开发靶向Cdc2的新型农药，以及实现对小麦条锈病的新型药剂防治提供了理论基础。

While this tale is infamous throughout Europe, it is fresh to American readers, and Myriam Cyr brings us the extraordinary letters; the fraught, dangerous, complex nature of this tumultuous period; and the fascinating lives of these real-life lovers in rich historical detail.

突出了那个暴动年代郁闷、紧张、危险、复杂的社会本质；运用多层面的细节描写来突出那段历史里的这对真实恋人的迷人爱情故事。

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。

The cold light fair instrument principle is to lie a wave-length the high strength between the 480-520 nanometers is only blue, through more than 12000 roots, the total length more than 1 mile fiber-optic conductions, again pass 2 slices Be plated the optical mirror slice of film processing by 30 many times, separate place the whole harmful purple outside and only with infrared ray, irradiation go to daubery on the special fair on the tooth, in the shortest time inside make fair through tooth essence small tube and many in the last years the deposition oxidize revivification function in the tooth surface and the deep dye creation and make the tooth returned to before having not yet dye of pure.

冷光美白仪原理是将波长介于480-520nanometer之间的高强度蓝光，经由12000多根、总长度超过一英哩的光纤传导，再通过两片经30多次镀膜处理的光学镜片，隔处了一切有害的紫外光与红外线，照射到涂抹在牙齿上的特殊美白剂上，在最短的时间内使美白剂透过牙本质小管与多年来沉积在牙齿表面及深层的色素产生氧化还原作用，使牙齿回到未经染色前的洁白。

His Holiness the Abhá Beauty (may my life be a sacrifice for His steadfast friends) is the Supreme Manifestation of God and the Dayspring of His Most Divine Essence.

巴哈子民信仰的基础是：'崇高圣尊乃上帝同一性与唯一性之显示者，乃亘古美尊之先驱；阿卜哈美尊（愿我的生命能祭献给祂忠贞之朋友们）乃上帝之至高显示者及上帝至圣本质之启端。

Some measures need to be taken to cut out the dead wood and streamline production.

一些人会说，因为人类本质上还是受寻衅的，所以这个世界注定要发生战争。

The factors that influence quality exposure are: photoptic gum of quality, performance, exposure before the death mask of humidity, light source performance, and a light source and the distance between the screen and so on, should be based on actual conditions seihan parameter.

感化曝平质量的身分有：感平胶的质量、毕命本能机能、曝平后网版的湿量、平源本能机能以及平源与网版之间的间隔等，答根据本质境况订定制版参数。

Act of self - help is a way of right relief which has been confirmed by civil code in many countries. It can compensate for the insufficiency of public relief. Essentially, it is an entity of just and order, right and power, right protection and precaution of right abuse. Self - help behavior can debar the effect of breaking law if it accords with the legal request. Our country' s civil code should construct the act of self - help system..

自助行为作为民事权利私力救济的方式之一，为近现代各国民法所确认，其功能在于弥补公力救济之不足，自助行为在本质上是秩序与正义、个人权利与国家权力、权利保障与防止权力滥用的对立统一，自助行为符合法定的构成要件，方可产生阻却违法的效果，我国民法典应当建立自助行为制度。

Face a foundation to teach the tide that course reforms, the pedagogic state of mind that participates in a class to change is disparate, outstanding table is as follows now a few respects: One, because the essence that does not catch a class to change on understanding is long-term since the debar from holding office that gets traditional education idea, the school and teachers are used to be in what should try educational baton to drive under, blindly follow sb.

面对基础教育课程改革的潮流，参与课改的教师心态迥异，突出表现在如下几个方面：一、在熟悉上抓不住课改的本质由于长期以来受传统教育思想的禁锢，学校和教师们习惯于在应试教育的指挥棒的驱赶之下，亦步亦趋。

A selfless person, or far-sighted national interests of the people, had to use extreme tactics a little to rectify the social, while allowing a small number of people have been learned, which naturally makes some people vindictive; a seemingly great, but the selfish nature of people, using people's selfishness, so that people are sacrificing their lives for petty profits and all day long, the results so that a handful of people live a debauched life, followed by the whole society rot!

一个无私的人，或者说为国家民族利益看得远的人，不得不用极端一点的手法整顿社会，而让一小部份人受到教训，这自然会让一些人怀恨在心；一个貌似伟大，但本质自私的人，利用人的私心，让人们为了蝇头小利而终日卖命，结果让一小撮人花天酒地，全社会跟着腐烂！

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。