查询词典 natural number

Based on the researches mentioned above, choosing 18 typical indices, which on behalf of the natural-human pressure (6), ecological states (8), and responses of the human and society (4), using analytic hierarchy process, the author established an estimate system of regional ecological security, worked out a half quantitative compound index number of regional ecological security in Lazi County.

在以上研究的基础上，选取代表自然和人文压力(6个)、生态系统状态(8)和人文社会响应(4个)的共18个典型指标，利用层次分析法建立区域生态安全状况评价体系，半定量计算出拉孜县区域生态安全综合指数。

Results: As compared with those of the irradiation control groups, the rhCuZnSOD showed significant beneficial effects on immunocytes, these included enhancing the proliferative response of T lymphocyte to concanavalin A and the activity of natural killer cells in spleen, increasing the number of whole spleen lymphocyte, leucocyte and lymphocyte counts in peripheral blood.

与照射对照组比较，rhCuZnSOD可减轻电离辐射对小鼠免疫细胞的影响，其作用包括增强脾T淋巴细胞对刀豆蛋白A诱导的增殖反应，提高脾自然杀伤细胞的活性，升高全脾淋巴细胞及外周血白细胞和淋巴细胞的数量。

Our company mainly engaged in natural rubber, synthetic rubber, chemical materials, and production of various types of oil resin, Coumarone, solvent oil, a number of varieties.

我公司主要经营天然胶、合成橡胶、化工辅料，并生产各种型号的石油树脂、古马隆、溶剂油等多项品种。

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。

However, the social natural resources of the obtain employment cost of the idea of traditional obtain employment as a result of situation of grim integral obtain employment, stale, insalubrious obtain employment psychology, inferior integrated quality, high specified number and deficient, impoverished undergraduate makes an appointment with time, autograph to restrict range of tripartite of post of course of study of rate, choose in the autograph graduate of more average college appears lag, on the low side and deviation.

然而，由于严重的整体就业形势、陈旧的传统就业观念、不健康的就业心理、较低的综合素质、高额的就业成本以及匮乏的社会资源，贫困大学生在签约时间、签约率、择业岗位三方面较普通大学毕业生显得滞后、偏低和偏差。

If teachers in the study of electromagnetic induction in the leading domestic level, and has chaired a number of national natural science fund projects.

如老师在电磁感应方面的研究处于国内领先水平，先后主持多项国家自然科学基金项目。

To many times the main food, food and more natural excreta on the more, the number will increase.

主要要多次食物，食物多了自然排泄物就多了，次数就会增加。

Results There was an markedly efˉfect for astragalus root stimulating the multiplication and transformation of spleen lymphocyte,promoting the delayed type of hypersensitivity,increasing the number of antibody-created cell,enhancing the level of serum hemolysin,promoting the expurgation effect and phagocytosis function of monocyte-macrophage and increasing the acˉtivity of natural killer.

结果 黄芪能明显刺激小鼠的脾淋巴细胞增殖、转化作用，促进小鼠迟发型变态反应作用，提高小鼠抗体生成细胞数，提高小鼠的血清溶血素水平，促进小鼠单核-巨噬细胞碳廓清作用，增强小鼠的单核-腹腔巨噬细胞吞噬能力，提高小鼠NK细胞活性。

Bus mobile TV, because of its huge audience and the number of "forced ratings" features, from the date of birth on the natural way to reach audiences with higher rates in the first quadrant IV of the competitive advantage of the monopoly of its operating strategy therefore focused on the improvement of audience loyalty.

公交移动电视，由于其数量巨大的受众和"强迫收视"的特点，从诞生之日起，就天然地拥有较高的观众到达率，处于第IV象限的垄断竞争优势所以其运营策略主要集中在观众忠实度的提高。

Geomancy, is not just a ceremony of the operation or the number of superstition, it also contains a rational utilization of natural conditions.

堪舆，不仅仅是一种仪式或者迷信的术数，它也包含着对自然条件的合理利用。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。