查询词典 length of time

Main influential factors on the improvement of H-PRVEP is severity of primary optic atrophy. The time length of compression of optic chiasm and volume of tumor also have influence to a certain extent.

影响H-PRVEP改善的因素主要是原发性视乳头萎缩，肿瘤大小常能反映视交叉受压时间的长短，对视觉功能有一定影响。

The results through XRD and SEM analyses show that, with the increase of the reaction temperature from 120 ℃ to 150 ℃ and time from 5 h to 15 h, the synthesized LiFePO4 particles grow from the irregular congeries of nano-crystals to the rectangular slabs with thickness of about 200 nm and side-length of about 800 nm.

X射线衍射和SEM分析结果表明，当实验温度为120~150 ℃，时间为5~15 h时，随反应温度的提高和反应时间的延长， LiFePO4从不规则的纳米颗粒团聚体逐渐生长为厚200 nm、长800 nm左右的规则矩形薄片。

And the effects of length of data N to the approximate entropy of chaotic system isalso analyzed.All these are accomplished by examining several time series produced by a surperposition of white noise and noise-free data.It uses the discrete system logistic map and continuous system Lorenz attractoras the examples.

以Logistic方程描述的离散系统和Lorenz方程描述的连续系统为例，采用白噪声和无噪声信号以不同的信噪比混迭而成数据的方法，分析了相同数据长度N，不同信噪比下，混沌系统近似熵的变化；相同信噪比，不同数据长度对系统近似熵的影响。

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。

Methods Analyzed the survival rate,the level of sensory recovery,the length of operative incision and the surgical time of two different methods for the treatment of the fingers tip defect and bones of fingers niditas,one method is fascial flap shift and planting back in natural position or dermatoplasty,the other method is regional flap shift.

运用筋膜瓣转移+原位回植术及局部皮瓣转移修复术治疗指端软组织缺损，对两种手术方法的手术时间、手术切口长度及指端成活率、感觉恢复程度的对比分析，了解两种手术方式的差异。

Results showed that: there were best range of the amount of solicitation reagent,the amount of polyethylene glycol, the length of the polyoxydation ethene side chain and the best time temperature and of the esteri.

通过确定不同的引发剂用量、聚乙二醇投入量、聚氧化乙烯侧链长度以及酯化反应的温度和时间，对所合成的新型聚羧酸系外加剂的性能进行比较。

In the instrument of lignum automatic measurement,the length of lignum was measured by CCD.The design of the time sequence driving circuit of CCD was a critical problem of its application.

木材自动测量仪是用来自动扫描工厂加工的木材长度，并将其图像和数据保存在计算机中，便于调用木材时查询。

The correlative analysis was done between PAIs and postoperative outcome. Results: The minimal diameter of right pulmonary artery was found at proximal portion in 62 cases, at middle portion in 22 cases and at distal portion in 34 cases; the minimal diameter of left pulmonary artery was found at proximal portion in 46 cases, at middle portion in 13 cases, at distal portion in 59 cases. The length of stay in ICU, mechanical ventilation time, dose of inotropic drugs correlated well with modified pulmonary artery index better than Nakata index, with Nakata index better than McGoon index.

目前临床上多用McGoon指数、Nakata指数作为形态学指标评估肺血管容量及肺血流情况，一般认为McGoon指数、Nakata指数越大，术后低心排发生率越低，生存率越高，但这些指数有以下缺点：l 左、右肺动脉第一分支处的单点测量值能否反映肺血管的全貌尚有疑问。2 McGoon指数、Nakata指数无法预计术后肺血管的潜在发育能力。3 McGoon指数、Nakata指数都需通过心血管造影后测量获得，价格昂贵，有一定的创伤性，无法系统观察。

Hence, the identification task execution time is within a length L block of time-steps.

因此，证明任务执行时间在时间步的长度L块之内。

The boundary shape and length of fire zone are growth with time, which determine the fire HRR is variational with time and space distribution.

火场边界形状长度和火场面积随时间而变化发展，决定了火灾释热率在时间和空间分布上都是变化的函数，火灾HRR不同于稳态火和T〓火。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。