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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 CTM is suitable for the case that all E-type influentially uncontrollable subnets are state graphs, and the outstanding virtue is that the designed controller is explicit. The EMM is suitable for the case that all F-type influentially uncontrollable subnets are normalized cascade Petri nets, and the advantage is that control patterns can be on-line computed within polynomial times.

约束变换法适用于所有E-型影响不可控子网为状态图这种特殊的场合，用该方法所综合的控制器最大的优点在于所获得的控制器是显式的；特征标识法适用于所有F-型影响不可控子网为规范化序状Petri网这种场合，用该方法设计的控制器在线运算工作量是多项式可解的。

In recent years, the forever-lasting Taiwan and green architecture have become a major topic in our country. In order to resolve the runoff of rainwater resource, to prevent the spoliation of ecology and to reduce the effect of heat island, to search for the suitable mix design of the pervious concrete for Taiwan is not a small issue. Pervious concrete pavement is air permeable and water permeable, the soil underneath can be kept wet and rainwater can quickly filter into ground, so the groundwater resources can renew in time. It improves the environment of road pavement and also possesses many other advantages that improve city environment at drainage, sound absorption and skid resistance, and is suitable for the rainy and humid environment in Taiwan area. However, its high air voids results in low strength, the surface layer of highway pavement was seldom used pervious concrete due to heavy traffic loading.

近年来国内以打造永续台湾与绿建筑为未来努力的方向，为解决雨水资源流失、环境生态破坏及热岛效应扩张，研发本土透水混凝土实有其重要性，透水混凝土铺面可以使空气与水自由地有效的渗入，地下土壤可保持湿润，雨水也能够快速渗入地面至地下水，地下水资源或水位能即时更新，它改善道路铺面的环境，其它的优点尚包括具有良好排水、噪音吸附与车辆抗滑能力，适合铺设於台湾多雨多湿之环境，由於透水混凝土孔隙率较高，其强度低於一般混凝土，应用於重交通量公路面层因此受到局限。

The results indicated that the suitable dosage for seed irradiation of caper spurge was about 600Gy,and the peak value of SOD and CAT activities in caper spurge M_1 seedlings could be used for evaluation the suitable dosage for seed irradiation.

本研究初步认为续随子的适宜辐照剂量应在600Gy左右。M1代幼苗体内SOD及CAT活性峰值可作为续随子适宜辐照剂量的判定依据。

The part that I'm taking on isn't exactly clear at the moment. I know I will be one of the ensemble..and possibly get a few lines here and there....The show already has it's lead roles casted and the other roles are not suitable for my age. But, I don't mind...it will be the first time that I actually get to be a part of a professional Broadway production! Everything is coming from NY!!! And the original writer is going to be the director! So, I know that this will be my chance to learn and make my way into the industry. Hopefully, next time, there will be a bigger role for me to play.I'm so thankful that God has been leading me into the right direction. I am so blessed with opportunities...and I know that my patience is finally paying off. I'm very excited to be able to train more in tap dancing because I have always wanted to improve in that area....it's going to be a lot of hard work..but, I'm so looking forward to it. I do feel very sorry for my fans who have been walking with me since the beginning of the competition. They have been so supportive of me and it made me so sad to see them cry when I made my decision. I hope that they will not be upset with me because of it. I hope that they will see that this choice will only help my future...and I hope that they will continue to support me even though my participation with the competition has come to an end. It really touched me to see that they cared so much.

我知道我可能只是其中一个群舞，或许会有点台词，因为他们早就订了女主角人选，另一个女角年纪比较大，并不合适我，但是我不在乎…这是我的第一次参于真正百老制作的演出，每一个成员都是从纽约来的，原编剧将会亲自来导演这次演出，所以我很清楚这是我最好的学习机会，也是给我提供了一条通向百老的捷径之路，下一次我一定会争取到一个很好的角色…我感激我的上帝指引我一个正确的方向，我非常感激有这麼好的一个机会，我等了那麼久，总算有了一个好的起步…我特别兴奋的是，我这下子总算有机会好好学"踢躂舞"了，这是我最弱的一种舞，我一直希望能把它学好，尽管我知道会很辛苦，但是我已经作好了思想准备…还有对那些从一开始就支持我的那些粉丝，我感到非常抱歉，尤其是当我在台上说出我离去的决心时，看到她们一个个都哭得那麼伤心，我也很难过，我希望她们能明白，这个决定是绝对对我前途有利的，我希望就算是我不再比赛，她们仍然会支持我，一直以来，她们对我的关心和鼓励最让我心动的…。

Depending on the need, the PK201 is more suitable for users who prefer a more flexible and tiny model but the brightness of the image will be compromised; PK301 is more suitable for commercial users who are particular about optimal projection results and a longer projection period.

根据不同的需要，PK201更适合用户喜欢谁更灵活和微小的模式，但图像的亮度会受到损害； PK301更适合谁最讲究最佳预测结果和预测期较长的商业用户使用。

In summary, MNL and TNL could be used as indices for potential mineralizable N, which are not only suitable for the first season crop but also suitable in evaluating soil N-supplying capacity for two successive season crops; while SON, total soil N and soil microbe N were not good indices for soil potential mineralizable N in short-term.

总体上看，可溶性有机氮和土壤全氮、土壤微生物氮不能作为反映短期可矿化氮的指标；间隙淋洗通气培养淋洗液中淋洗矿质氮、淋洗总氮是评价可矿化氮的较好指标，不仅适宜于第一季作物，而且也适用于对连续两季作物土壤供氮能力的评价。

I think the best job, or the first point to school for good, because the experience is just graduated must do not have what experience, just graduation went entrepreneurial road, of course, also can not just this road will walk very hard, want to be less circuitous, hand has walked some part, can choose a project to join, because the current franchise has become the mainstream of entrepreneurial success, but be careful, want to have the good brand awareness, such as 361 degrees, horse that can be more creative, or some of the shop is very good for young people, for example, business investment, AA international cartoon small quick return, suitable for young people to do business, diversified interactive is unique, not only have all kinds of cartoon character, and the peripheral product manufacture and animation DIY COSPLAY photography, the most popular among young people nowadays and the pursuit of something, is very promising.

创业项目网_我是一个刚毕业的大学生，想自主创业干点什么，该怎我觉得最好先打工，还是先到社会上学点经验为好，因为刚刚毕业肯定没有什么经验可言，刚毕业就走创业路，当然也不是不可以，只是这条路会走的很艰辛，要想少走点弯路，手里有部分资金，可以选择一个项目来加盟，因为目前连锁加盟已成为成功创业的主流方式，但选择加盟要谨慎，要找有一定知名度的好品牌，比如像361度、森马这样的都可以，再就是一些比较有创意的店也很不错，适合年轻人经营，例如AA国际动漫店，投资小回报快，适合年轻人做，多元化互动式经营，是目前国内独一无二的，不仅有各类动漫周边产品，还有个性的动漫DIY制作和COSPLAY摄影写真，这些正是现在年轻人最青睐和追求的东西，非常有前景。

Note: Richard Barber, the Knight and Chivalry, New Jersey, 1976 edition, page1 It is not easy to get a good war horse, some horses are only suitable for pulling carts or plowing while some looks beautiful and strong but that would be only suitable for general riding and traveling instead of using in the complex, volatile, disordered and fighting battlefield.

能得到一匹优秀的战马并不是一件简单的事情，有些马只适于拉车、耕田；也有些马看似健美，但只可用于一般性骑乘和旅行，不宜在复杂多变、混乱厮杀的战场上使用。

Different from Ni70Mn25Co5（suitable for growing （100）crystal plate）, Fe is suitable for growing (111) crystal plate. It may be related to that (100)growing area of Fe is very narrow. In diamond research with medium of Fe, most crystals are octahedron or six-eight body. It is very hard to synthesize hexahedron diamond.

与Ni70Mn25Co5触媒生长特性（适合于（100）晶面生长）不同，Fe作触媒适合于（111）晶面生长，这可能跟Fe触媒的（100）生长区非常窄有关，因为在Fe触媒粉末金刚石研究中，晶体基本为八面体或六八面体，很难合成六面体金刚石。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐