使用寿命

Alkylation of phenol was used to research catalytic activity of Y/MCM-41. The results have shown that Y/MCM-41 has higher catalytic activity than the traditional Y and MCM-41. For the Y/MCM-41, not only the conversion of phenol raised with tert-butyl alcohol and reaction temperature raising, but also Useful time of Y/MCM-41 was longer. For the Y/MCM-41, the conversion of phenol raised with reaction time raising, But that increased slowly after 3 hours.

结果表明：Y/MCM一41分子筛具有比Y型或MCM一41更高的催化活性；而对于Y/MCM一41分子筛，随着叔丁醇和温度的增加，苯酚的转化率也增加，且使用寿命也较长；对于Y/MCM-41分子筛，随着反应时间的增加，苯酚的转化率增加，但反应3小时之后，苯酚转化率增加就不明显了。

When processing the same type of cylinder blocks produced by different companies, we find obvious difference in life span of the two same reamers.

在加工不同厂家生产的同型号汽车发动机缸体过程中发现刀具使用寿命相差较大。

These includes, selective system installations in MAUs or RAHs, necessary FFU system coverage, real testing assurance for filters, actual lifetime, and last but not the least, the more and more popular Mini-environment molecular filtration system.

这些问题包括，如何选择性的安装过滤器，对于特定系统，怎么选择装在新风或回风系统，FFU 分子过滤器的必要覆盖率，过滤器的测试保障，实际的使用寿命，以及日趋普及的微环境分子过滤系统。

Super Finished Raceways - Specially honed to minimise noise and improve lubricant distribution and life.

超精加工滑轨：经特殊工艺打磨，使噪音降至最低，且有助于润滑剂均匀分布并延长使用寿命。

Since I founded the company has experienced over 20 set, now has 22 million yuan in fixed assets, staff of 256 people, 63 technical personnel, the Company to develop and produce the fire-retardant glass pipe box, also known as cable bridge, such as trunking With corrosion-resistant, anti-aging, high strength, fire-retardant properties, and insulation, light weight, long life, easy to install and simple advantages of the current highway, railway, municipal bridges, post and telecommunications, Flight Operations, electricity, communications bridge a Of the ideal replacement products.

我公司自创办至今已经历二十多载，现拥有固定资产2200万元，职员256人，技术人员63人，本公司研制生产的阻燃型玻璃钢管箱，又名电缆桥架、线槽等具有耐腐蚀、抗老化、强度高、阻燃性能好、绝缘、重量轻、使用寿命长、安装方便简单等优点，是目前公路、铁路、市政桥梁、邮电、航务、电力、通信桥架的一种更新换代的理想产品。

The equation of the solid-liquid coupling vibration of pipe conveying fluid is deduced , and life time has carried out a forecast on the pipeline .

推导了304不锈钢管道流固耦合方程，并对管道使用寿命进行了预测。

For the drilling contractor the correct hardbanding can prolong the life of his drill pipe by preventing the tool joint OD wearing.

对于承包商来说，合适的加硬层可以减少钻具接头处的OD损耗，从而延长设备的使用寿命。

That is a longer life than the standard 2000 hours we find on most digital projectors these days.

这是一个比标准2000小时，我们在大多数这些天数字投影仪发现更长的使用寿命。

The performance and working life of the seals of drilling mud pump plunger will have a direct impact on the working behavior and quality of the high-pressure mud pump.

钻井泥浆泵柱塞密封性能的好坏与使用寿命的长短直接影响到高压泥浆泵的工作性能及质量。

In respect that various requirements of load and temperature on different parts of the baker, firebrick lining was chose reasonably, and the dosage of light heat preservation brick is in enlargement. As a result of that, the weight of the furnace was decreased, and increased its performance of heat preservation and cumulation was increased consumedly. With the use of ""W"" type fire tunnel and straight-through dilatation joint, and two enlargement of the perpends on the wall appropriately, all the problems of heat preservation in the anode baker, uniform temperature in the tunnel, and its life span were solved effectively. In the research of anode blocks in and out of the furnace, and of tidying it up, the multi-function crane clamps was alented and the assembling unit was reconstructed, which made it easy to automatic ally assemble the carbon blocks of various specifications with only one set of assembling unit.In the aspects of automation, a new type pulse combustor and solid thermocouple, as a result of that, not only the control accuracy of the fire tunnel's temperature was increased, but also the system function was improned to be more dependable, safe and practicable.

在焙烧炉炉体研究方面，针对焙烧炉不同部位的负荷及温度要求的不同，合理选用耐火材料，加大轻质保温砖的用量，既减轻炉体的重量，又大大提高炉体的保温蓄热性能；火道墙采用&W&型火道结构，直通性膨胀缝，并适当加大火道墙竖缝，有效地解决了阳极焙烧炉的保温、火道温度均一及火道墙的使用寿命等问题；在阳极炭块装出炉及清理等研究方面，通过对编解机组及多功能天车夹具进行改造，实现一套机组对多规格炭块的自动编组、解组及装出炉问题；焙烧炉自动化控制研发中，采用先进的分散式控制系统，研制开发新型脉冲燃烧器及实体型热电偶，不仅提高了火道温度的控制精度，而且提高了系统的可靠性、安全性、实用性。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。