查询词典 arid

With a crack of joke, all our worries and sadness disperse like mist and smoke, and we are full of vim arid vigor once again.

随着一声玩笑，我们所有的焦虑和伤心烟消雾散，我们又重新充满了生机和活力。

Northern crossbreed results showed that it is expressed only in human brain. This gene has a 50% amino acid sequence identity with Caenorhabdilis elegans, Anopheles gambiae sir arid Drosophila, and 94% amino acid sequence identity with Rattus norvegicus and Mus musculus.

Northern杂交结果表明：该基因只在人类大脑组织中表达，且与无脊椎动物线虫、疟蚊和果蝇的同源基因有50%的氨基酸同源性，与脊椎动物大鼠和小鼠的同源基因有50%以上的氨基酸同源性。

This article uses the literature material law, the cut-and-try method, visits the survey procedure, the mathematical method of average and so on, in the back more -like high jump teaching, the use skill migration rule, begins from the interesting teaching to create the thin raw white silk and the design sports game, and utilizes it in the back -like high jump experiment teaching, through the teaching discovered utilizes the game teaching method in the back more -like high jump teaching, not only is advantageous to the student to complete technical movement grasping, moreover is advantageous to the change former back -like high jump teaching arid tasteless aspect, thus enhances the teaching effect.

本文采用文献资料法、实验法、走访调查法、数理统计法等，在背越式跳高教学中，利用技能迁移规律，从趣味性教学着手创编与设计体育游戏，并把它运用于背越式跳高实验教学中，通过教学发现在背越式跳高教学中运用游戏教学手段，不仅有利于学生对完整技术动作的掌握，而且有利于改变以往背越式跳高教学枯燥乏味的局面，从而提高教学效果。

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。

Using arid area (annual rainfall about 200mm) and dankness area (annual rainfall about 600mm) contrast test, determining the new potato variety's drought resistance, chlorophyll A, B content and CAT activity in the different growth period, study the relation between chlorophyll content, CAT activity and the drought resistance.

采用干旱地区（年降雨量200 mm左右）与阴湿地区（年降雨量600 mm左右）对比试验，测定马铃薯品种生育期的叶绿素a、b含量和CAT活性，研究其与抗旱性关系。

This paper presents design principle and realizable approach of Classification and Recognition Inference Decider for Soil Remote Sensing in arid land.

中文摘要：介绍了干旱区土壤遥感分类识别推理决策器的设计原理与实现方法。

Sixty SD rats were with rosiglitazone group, ty1e 2 diabetes mellitus (T2DM) model group, T2DM with rosiglitazone group arid T2DM will; decimeter wave group.

将60只SD大鼠随机分为4组，即正常对照组、糖尿病模型组、糖尿病罗格列酮治疗组和糖尿病分米波治疗组。

But most people reckon that the most likely explanation is that it was started by natural causes. For Southern California is an arid, desert landscape that was almost uninhabited for centuries.

但是大多数人认为大火最可能是自然燃起的，因为几百年来南加利福尼亚就是一片干旱而又几乎无人居住的沙漠地区。

Cemented coatings are often dark-colored and are usually termed "desert varnish" from their common occurrence in arid regions.

这种由胶结物形成的表层往往是深色的，因为它们通常出现在干旱区，故常称为"荒漠漆"（"desertvarnish"）。

A technically perfect but arid performance of the sonata;l a desiccate romance; a prissy and emotionless creature...settles into a mold of desiccated snobbery-C.J.

技巧完美但是演奏沉闷的奏鸣曲；沉闷的冒险故事；谨慎、冷漠的傀儡……一个模子倒出来的、沉闷无趣的势利——C·J·罗诺。

The circulation, consumption and reproduction of the trilogy have not only testified to its historical significance and literariness, but also invested it with new meanings.

该三部曲的流通、消费与再生产不仅验证了其历史意义及文学性，而切还赋予它以新的意义。

If he thought that he could buy me off, he would be wrong.

如果他认为他可以收买我，那他就大错特错了。