查询词典 ring in

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。

Barley seeds were irradiated with five different doses of 60 Co-γ ray.There were many kinds of chromosome aberration in pollen mother cells,such as bridge,laggards in anaphase I and anaphase II,asymmetrical division in anaphase I and asynchronous division in anaphase II,ring quadrivalent in metaphase I,three pole division and micro-nuclei in telophase I,micro-nuclei in tetrad and some micro-nucleus separates from the tetrad to form polyad.

大麦种子经5种不同剂量γ射线辐照后， M1植株的花粉母细胞出现多种染色体畸变类型，例如后Ⅰ、后Ⅱ中出现桥、落后，后Ⅰ中出现不对称分裂，后Ⅱ中出现不同步分裂，中期Ⅰ出现环状四价体，末期Ⅰ中有三极分裂和微核，四分体中出现微核且有的微核独立于四分体，从而形成多分体。

A lot of pristine rural areas, outer unripe model the city changes a course in finished its blame quickly farming spend change, but this kind transforms and did not make these village community blend in a city smoothly, in the city evolving below the influence in numerous element however most hard the area that fast city turns, formed what what say now namely " the village in the city ", these dorp were immersed in predicament on the last ring that in its the city turns chain.

许多原来的农村，在外生型的城市化进程中迅速完成了其非农化转变，但是这种转变并没有使这些村落社区顺利融入城市，而是在众多因素的影响下演变成了城市中最难以彻底城市化的区域，即形成了现在所说的"城中村"，这些村落在其城市化链条的最后一环上陷入了困境。

In the sense of cutset, the relation between the rough set of a cutset and the cutset of a rough set, a fuzzy rough set of a fuzzy primary ideal in a semigroup is proved to be its fuzzy primary ideal. The sixed chapter is Rough Primary Ideals and Rough Fuzzy Primary Ideals in rings, the corresponding results of a semigroup are generalized in a ring. The last chapter is Rough-fuzzy Subsemirings in Semirings, First, the lower and upper rough-fuzzy semirings together with the left and the right ideal are defined.

利用截集意义下，截集的粗糙集与粗糙集截集的关系，证明了在完备同余关系下半群中的模糊准素理想的粗糙集是模糊准素理想；第六章是环中粗准素理想和粗模糊准素理想，将半群中的相(来源：A70BC论文网www.abclunwen.com)应结果推广到环中；第七章是半环中的粗模糊子半环，首先，给出上粗模糊子半环及上粗模糊理想等概念，并研究了它们的性质。

Outlined in the Beijing Olympic Games, at 13:30 on August 13 Switzerland and France than was Ankan Qiela La Road Cycling Championship. Ankan Qiela La France in the World Championships: 2004 Bardolino, Italy was eighth, 2005 Madrid, Spain, was third, 2006 Salzburg, Austria received first place in 2007 at Stuttgart, Germany was the first ; France 2005 cycling sai Laise Skopje was seventh; Flanders Cycling Grand Prix E3 second place; Belgium Harelbeke 2007 Road Cycling sai second place; Florence - Bicycle sai Pistoia, Italy Paper 2004 Si Tuoya fourth; Ghent - Victoria Buddhist roots bike sai fourth; Road Cycling Events, the Belgian peacekeepers Buddhist roots fourth in 2006 Belgian peacekeepers were sixth Buddhist roots; HEW Classic Bicycle Germany 2005 Hamburg Road Cycling sai fourth in the 2006 German Beer, Luke second Challenge; Milan - San Remo Road Cycling sai second place; San Remo, Italy, the 2008 Road Cycling sai was the first; Monte Siena, Italy 2008 Paschi Eroica Road Cycling sai was the first Swiss national championships, in 2008 Switzerland was the first Messen; Stettlen 2007 Switzerland was the first in 2006 was the first Ruishiboning root 2005 Switzerland was the first Hagendorn; Highway Cycling Merit 2007 Rui Shibu Kruger was second in Paris - Roubaix bicycle sai , 2006 France was the first Roubaix; Roubaix France was second in 2008; 2005 Roubaix France was eighth; Denmark Post bike sai The 2006 final ranking was the first Danish Frederiksberg; ring The 2006 Belgian Flanders Cycling Road Cycling sai Meerbeke was sixth; Etruscan - Adriatic bike sai , 2008 Italy's Benetton and child care - Badelt-care was the first in the Central bike sai Luxembourg, Luxembourg Central Di Jixi 2005, was second; bike sai Central California, the United States in 2008 in Pasadena, California, was fourth ; Athens, Greece in 2004 was the 10th individual time trial; Olympics

瑞士法比安坎切拉拉在世界锦标赛：2004 意大利巴多利诺上获得第八名，2005 西班牙马德里上获得第三名，2006 奥地利萨尔茨堡上获得第一名，2007 德国斯图加特上获得第一名；2005 法国莱塞比耶自行车赛获得第七名；佛兰德E3自行车大奖赛获得第二名；2007 比利时哈勒尔贝克公路自行车赛获得第二名；佛罗伦萨-皮斯托亚自行车赛，2004 意大利皮斯托亚获得第四名；根特-维佛根自行车赛获得第四名；公路自行车赛 2005 比利时维佛根获得第四名；2006 比利时维佛根获得第六名；HEW自行车经典赛 2005 德国汉堡公路自行车赛第四名；2006 德国比尔，路克挑战赛第二名；米兰-圣雷莫公路自行车赛获得第二名；2008 意大利圣雷莫公路自行车赛获得第一名；2008 意大利锡耶纳 Monte Paschi Eroica 公路自行车赛获得第一名；瑞士全国锦标赛，在2008 瑞士Messen 获得第一名；2007 瑞士Stettlen 获得第一名；2006 瑞士伯宁根获得第一名；2005 瑞士Hagendorn获得第一名；公路自行车赛 2007 瑞士布鲁格获得第二名；巴黎-鲁贝自行车赛，2006 法国鲁贝获得第一名；2008 法国鲁贝获得第二名；2005 法国鲁贝获得第八名；丹麦邮政自行车赛决赛排名赛 2006 丹麦腓特烈斯贝获得第一名；环佛兰德自行车赛 2006 比利时Meerbeke 公路自行车赛获得第六名；伊特鲁里亚-亚得里亚海自行车赛，2008 意大利圣贝内代托-德尔特龙托获得第一名；在环卢森堡自行车赛，2005 环卢森堡迪基希，获得第二名；环加利福尼亚自行车赛，在2008 美国加利福尼亚帕萨迪纳，获得第四名；2004 希腊雅典个人计时赛获得第十名；奥运会 2008 北京奥运会男子公路个人赛季军。

W hen we let freedom ring, when we let it ring from every village and every hamlet, from every state and every city, we will be able to speed up that day when all of God's children, black men and white men, Jews and Gentiles, Protestants and Catholics, will be able to join hands and sing in the words of the old Negro spiritual, Free at last!

当我们让自由之声轰响，当我们让自由之声响彻每一个大村小庄，每一个州府城镇，我们就能加速这一天的到来。那时，上帝的所有孩子，黑人和白人，犹太教徒和非犹太教徒，耶稣教徒和天主教徒，将能携手同唱那首古老的黑人灵歌：终于自由了！

When we let freedom ring, when we let it ring from every village and every hamlet, from every state and every city, we will be able to speed up that day when all of God's children, black men and white men, Jews and Gentiles, Protestants and Catholics, will be able to join hands and sing in the words of the old Negro spiritual, Free at last!

当我们让自由之声响起来，让自由之声从每一个大小村落、每一个州和每一个城市响起来时，我们将能够加速这一天的到来，那时，上帝的所有儿女，黑人和白人，犹太人和非犹太人，新教徒和天主教徒，都将手携手，合唱一首古老的黑人灵歌：终于自由啦！

When we let freedom ring, whem we let it ring from every village and every hamlet, from every state and every city, we will be able to speed up that day when all of God's children, black men and white men, Jews and Gentiles, Protestants and Catholics, will be able to join hands and sing in the words of the old Negro spiritual, Free at last!

当我们让自由之声轰响，当我们让自由之声响彻每一个大村小庄，每一个州府城镇，我们就能加速这一天的到来。那时，上帝的所有孩子，黑人和白人，犹太教徒和非犹太教徒，耶稣教徒和天主教徒，将能携手同唱那首古老的黑人灵歌：终于自由了！

When we let freedom ring ,when we let it ring from every village and every hamlet ,form every state and every city ,we will be able to speed up that day when all of God's children ,black men and white men ,Jew and Gentiles ,Protestants and Catholics ,will be able to join hands and sing in the words of the old Negro spiritual , Free at last !

当我们让自由之声轰响，当我们让自由之声响彻每一个大村小庄，每一个州府城镇，我们就能加速这一天的到来。那时，上帝的所有的孩子，黑人和白人，犹太教徒和非犹太教徒，耶稣教徒和天主教徒，将能携手同唱那首古老的黑人灵歌：终于自由了！

Rajaratnam who is out on bail is accused of being at the center of a massive insider-trading ring. Although he denies wrongdoing one of the other accused ring members Mark Kurland was sentenced this month to more than two years in jail.

保释中的拉贾拉南被控在大型内幕交易圈中身处关键位置，虽然他极力否认有罪，另一个圈中人士马克·库尔兰却于本月受审，判决结果是有期徒刑两年。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷