查询词典 on scratch

Settlers bought the goods they needed from salesmen or peddlers who traveled in Wagons. People often paid for the goods with pieces of gold jewelry. To test the true value of a piece of gold, a peddler would make a small scratch on it and put a drop of nitric acid on the scratch.

拓荒者从坐马车的小贩手中买东西，人们常常用金首饰付款，为了测定一块金子的真正价值，小贩常常在金子上划一道印，然后放一滴硝酸在这道印上。

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。

In this study, homo- and co-PP were modified by nano- calcium carbonate and the effect of additive on scratch resistance evaluated.

在本研究中，均聚和共聚PP用纳米碳酸钙进行改性，评价了添加剂对耐刮擦性的影响。

My son's contract isn't terribly formal, written in his messy handwriting on scratch paper.

我儿子的合同并不算太正规，是他用潦草的字迹写在一张草稿纸上的。

Daytime fun in the sun at the Dino Beach Summer Stage really starts to sizzle on July 14th when Miami's Freestyle Battle Champ MC Jin takes to the mic and UK turntablists Scratch Perverts hit the decks, making this non-stop hip hop / turntablism / dnb freestyle outdoor party.

就在7月14日当天，来自英国的DJ Scratch Perverts以及迈阿密Freestyle MC比赛冠军7届得主MC Jin将联合打造本次活动的音乐，马不停蹄地将这个结合了hip hop / turntablism / dnb等多种音乐类型的露天party在炎炎夏日的热带风暴舞台上，推向炙热的高潮！

Doped out our proposal on scratch paper.

他从很小的时候起就开始自己挣饭吃。

After silently working on the problem on scratch paper, the learners teach each other and discuss any confusion or misconceptions.

在草稿纸上练习有关习题后，学习者开始彼此学习和讨论一些混淆或误解的问题。

The only way to "scratch" brain itch is to repeat the song over and over in your mind. Unfortunately, like with mosquito bites, the more you scratch the more you itch, and so on until you're stuck in an unending song cycle.

唯一将之去除的方法就是在脑海里不停地重复这首歌曲，不幸的是就象蚊子咬人一样，越痒越挠越挠越痒，直到你陷入无休止的歌曲循环中。

Caching techniques has been studied for decades, whilst recently scratch-pad memory is getting more and more focuses on it, because of its lower cost and lower power-consumption comparing to the cache.

关於快取记忆体的研究已经进行数十年，然而草稿记忆体(Scratch-pad memory)由於其较快取记忆体低的功耗与成本，近年亦吸引许多研究者投入。

Nobody loves you when you're down and out [00:18.29]Nobody sees you when you're on cloud nine [00:26.92]Everybody's hustlin' for a buck and a dime [00:35.16]I'll scratch your back and you scratch mine [00:44.54]I've been across to the other side [00:52.89]I've shown you everything, i got nothing to hide [01:01.46]And still you ask me do i love you, what it is, what it is [01:11.71]All i can tell you is it's all show biz [01:19.34]All i can tell you is it's all show biz [01:32.64]Nobody loves you when you're down and out [01:41.31]Nobody knows you when you're on cloud nine [01:49.88]Everybody's hustlin' for a buck and a dime [01:58.67]I'll scratch your back and you knife mine [02:07.40]I've been across the water now so many times [02:16.16]I've seen the one eyed witchdoctor leading the blind [02:24.87]And still you ask me do i love you, what you say, what you say [02:33.11]Everytime i put my finger on it, it slips away [02:41.46]Everytime i put my finger on it, it slips away [03:26.88]Well i get up in the morning and i'm looking in the mirror to see, ooo wee!

当你落魄潦倒的时候，没有人爱你 [00：18.29] 当你是在云九上的时候，没有人看见你 [00：26.92] 每个人 hustlin'为一块钱和一个一角硬币我将擦你的背面和你擦伤的我的 [00：44.54] 我有是横过到另一边我有显示你每件事物的， i 什麽也不得到到兽皮我做 i 的你问和剧照爱你，它是什么，它是什么所有的 i 能告诉你的是它所有的是演艺事业所有的 i 能告诉你的是它所有的是演艺事业 [01：32.64] 当你落魄潦倒的时候，没有人爱你 [01：41.31] 当你是在云九上的时候，没有人认识你 [01：49.88] 每个人 hustlin'为一块钱和一个一角硬币我将擦你的背面和你刀的我的 [02：07.40] 我有是横过水现在如此许多次 [02：16.16] 我有看眼的 witchdoctor 领先盲人我做 i 的你问和剧照爱你，你说的事情，你说什么 Everytime i 把我的手指放在～上它，它滑倒离开 Everytime i 把我的手指放在～上它，它滑倒离开好的 i 在早晨起床的和我正在顺便探访镜子看见， ooo 很小的！

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。