可靠的

This is a good investment.

这是一笔可靠的投资。

The 2051 provides a reliable differential, gage, and absolute pressure measurement with a variety of output protocols, materials and process connections.

在2051年提供了可靠的差别，规，并与输出协议，材料和工艺连接各种绝对压力测量。

The Rosemount 2051 provides a reliable differential, gage, and absolute pressure measurement with a variety of output protocols, materials and process connections.

罗斯蒙特2051提供了可靠的差别，规，并与输出协议，材料和工艺连接各种绝对压力测量。

It has set up a reliable technical assistant relation with the vegetable Institute of the National Agra.

技术人员素质较好，与中国农科院蔬菜所、北京农科院蔬菜所、天津农科院蔬菜所、承德市蔬菜所建立了可靠的技术依托关系。

It is a reliable method that preventing AIO and reducing complication after the abdominal operation.

本研究表明，莪术油注射液具有减少炎症渗出、促进胃肠功能恢复、增强纤维蛋白溶解、清除氧自由基等作用，用其预防腹部术后AIO及减少术后其它并发症，是一种可靠的方法。

CO2 is a safe natural refrigerant which had been and will be used in air conditioning andheat pump systems.

CO2是一种安全可靠的自然工质，可望在空调和热泵系统中得到应用。

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。

Shijiazhuang is the Political and cultural center of Hebei,traffic is Convenient with rich Tourism Resources,as the citizens are becoming richer,to go on a journey become the main way for them to relax.the text has got the essential information of the citizens to go on a journey by doing Information processing and analysis of the 454 retractile Valid questionnaires combined with some Theoretical knowledge.showed up the law act and the Travel preferences of the citizens and sumed up Various types of content of the citizens of Shijiazhuang to travel,including the way of travel、Tourism consumption、choice of the Tourist destination and so on.this research offers the information analysis for the Tourism Services and also offers a reliable basis for the research of Urban Planning and Construction and tourism planning.we can consult the Resource assessment and development and The siting of reception facilities based on this.perfect the tourism market of Shijiazhuang by studying the Resource conditions and market conditions,and offer reliable information and Create an enabling environment for the travelling of the citizens.

石家庄是河北省的政治文化中心，交通便利，旅游资源丰富，随着石家庄市居民生活水平的提高，出外旅游已经成为居民休闲放松的主要方式之一。本文对所收回的454有效问卷进行信息处理和分析并结合相关理论知识，得到了石家庄市居民外出旅游的基本信息并对其进行了原因分析，揭示出了石家庄市居民的旅游行为规律和出行偏好，总结出石家庄市居民从事出外旅行游览活动的各类内容，包括出游方式，旅游消费，对旅游目的地的选择等。此次的调查研究为石家庄市旅游服务行业的工作提供信息分析，为分析研究旅游规划和城市规划和建设提供了可靠依据，同时也可以以此来考虑旅游目的地的资源评价和开发、接待设施的选址等等，从资源条件和市场条件考虑来完善石家庄市的旅游市场，并且为石家庄市居民外出旅游提供更加可靠的信息，创造更加有利的环境。

The chapter two was focused on the samarium diiodide promoted organic reactions and their applications in organic synthesis, firstly, a new synthesis of highly substituted cyclopentadienes from a,β-alkynone promoted by samarium diiodide was investigated and the highly substituted cyclopentadienes were prepared in moderate to good yields under mild conditions. Secondly, the Michael addition and Michael-aldol tandem reaction of diorganyl diselenides or diorganyl disulfides with α,β-alkynones mediated by samarium diiodide were studied and a series of alkenylsulfides and alkenylselenides were prepared in good yields. Then the highly regioselecfive nucleophilic addition of the allylsamarium bromide to α,β-alkynones were explored. We found that the allylsamarium bromide reacts with α,β-alkynones to afford regiospecificly 1. 2-nucleophilic addition products in good yields under mild condition. At last we studied the coupling reaction of aryl halides promoted by NiCl〓/PPh〓/Sm〓.

第二章 研究了二碘化钐、金属钐促进的有机反应：1、二碘化钐促进下α，β-炔基酮的偶联环化反应，提供了一种制备多取代环戊二烯的新方法；2、二碘化钐促进下的二硫醚、二硒醚与α，β-炔基酮的Michael加成反应，为高产率地制备多取代的烯基硫或烯基硒化合物提供了方便可靠的新方法；3、二碘化钐促进下的二硫醚、二硒醚与α，β-炔基酮和醛、酮的Michael—aldol串联反应，提供了一种一锅法高产率地制备多取代的含硫的烯丙基醇或含硒的烯丙基醇类化合物的方便可靠的原子经济性的新方法；4、烯丙基溴化钐与α，β-炔基酮的高度区域选择性的1，2-亲核加成反应；5、NiCl〓/PPh〓/Sm〓促进的卤代芳烃的偶联反应-一种从各种卤代芳烃制备联苯类化合物的有效方法。

Many years, the Weishi Fire Protection Subsidiary has giver full play to its technical advantage of design and production of different fire protection equipment and pressure vessels, and at the same time continuously absorbs the domestic and foreign advanced technology in order to meet the requirements of the market and has established the leading position in the field of China fire protection technology step by step.

&卫士&品牌的固定灭火产品，以其可靠的性能、稳定的质量、良好的信誉，已经成为国内固定灭火产品，特别是气体灭火产品最大的制造企业之一，为我国电力、电信、移动、石化、铁路、民航等行业的数百项大型工程提供了各种质量优良，性能可靠的灭火设备。多年来，公司在发挥自身设计与生产各类自动灭火设备及压力容器的技术优势的同时，不断吸收国内外的先进技术，改进和完善自身产品，逐步建立了在国内固定灭火技术领域的领先地位。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。