管

Taking the friction into account and based on the empirical relation for flow friction in circular tube, the paper developed a correlation for the friction factor of gas-solid flow in riser.

参照圆管中的单相流动，考虑提升管几何参数和操作参数的影响，通过定量分析提升管内气固悬浮物与管壁间的摩擦，提出了对表观颗粒浓度的修正式，修正浓度与实际浓度吻合良好。

The experimental results indicate that, over a ranger of tube side Reynolds number and Prandtl number (Re=4000~20000, Pr=6~7.5), the internal Nusselt number and friction factor of spiral-flat tube increased by 30%-150% and 20%-50% respectively compared with smooth tube at the same Re and Pr. The value of friction factor decreases with increasing the value of B/A as well as increasing that of S/de, and the same phenomena can also be observed for Nusselt number.

实验结果表明：管内Nu和f值均随均随B/A值和S/de值的增大而减小，但随B/A值的增加而减小得更快，B/A值对螺旋扁管管内传热与流阻性能影响更大；在相同Re和Pr下，螺旋扁管管内Nu数为光滑管的1.3～2.5倍；阻力系数f是光滑管的1.2～1.5倍。

The highest heat transfer coefficient for air flowing in the nine 3-D IFT with staggered arrangement fins is No9 tube. In the turbulent region, the heat transfer coefficient of No9 tube is a factor of 10.36 compared with smooth tube, and its thermodynamic performance coefficient is as high as 6.49; The average Nusselt number in the most superior 3-D IFT with staggered arrangement can be increased by about 1.04 times in the laminar flow, and 6.38 times in the transitional flow as compared with that in the smooth tube. The friction factor between fluid and tube wall can be 0.96 times in laminar flow, and 12.68 times in transitional flow as compared with that inside the smooth tube.

在进行实验的九根肋叉排三维内肋管中，换热最强的No9管与光管相比，在紊流区的换热强化比平均可达10.36倍，阻力增大比约为4.06倍，其热力性能系数高达6.49；在过渡流区的换热强化比平均可达6.38倍，同时阻力增大比约12.68倍；在层流区的换热强化比为1.04倍，而阻力增大比仅约0.96倍。

Addressing the pipe-rolling process consisting of rotary piercing mill, full-floating mandrel mill and stretch reducing mill, it is pointed out that both the Crop End Control technique of the stretch reducing mill and the Front-Tail Sharpening process should be jointly employed.

针对由斜轧穿孔机、全浮动芯棒连轧管机、张力减径机组成的轧管工艺，指出应将张力减径切头控制技术与管端轧薄工艺结合。并指明当今对轧管工艺的研发应从工艺技术本身和自动控制软件包两个方面着手。

In order to guarantee the normalcy of water-source heat pump heating system, except carries on the hydraulic calculation seriously in the design, correctly chooses each main branch caliber and ensures the rational distribution of flow, as well as uses the heating form of radiation comes from the earth or fan-coil unit, but should also be strict to the quality surveillance in the process of sinking heat source well and recharge well's construction, according to the geological structure, arranges the tube funnel reasonably, and in the unit movement debugging, raises the overall efficiency positively, and achieves the economical operation.

为保证水源热泵供暖系统的正常，除了在设计中认真进行水力计算，正确选择各主支管管径，保证流量的合理分配及采用地辐辅或是风机盘管供暖形式外，还应在凿供、回灌井的施工过程中严格质量监督，根据地质结构，合理布置滤管，在机组运行调试中，积极提高机组效率，并达到经济运行。

In order to guarantee the normalcy of water-source heat pump heating system,except carries on the hydraulic calculation seriously in the design,correctly chooses each main branch caliber and ensures the rational distribution of flow,as well as uses the heating form of radiation comes from the earth or fancoil unit,but should also be strict to the quality surveillance in the process of sinking heat source well and recharge well's construction,according to the geological structure,arranges the tube funnel reasonably,and in the unit movement debugging,raises the overall efficiency positively,and achieves the economical operation.

为保证水源热泵供暖系统的正常，除了在设计中认真进行水力计算，正确选择各主支管管径，保证流量的合理分配及采用地辐辅或是风机盘管供暖形式外，还应在凿供、回灌井的施工过程中严格质量监督，根据地质结构，合理布置滤管，在机组运行调试中，积极提高机组效率，并达到经济运行。

We have more than 60% of market share of china,our products are widely used by pipe and fitting factories,gas and water supplying companies,construction units etc.,part of the products are exported.

经过多年的发展，目前开发的产品包括热熔对接焊机、管件热熔焊机及异径管件对接机被国内各管材、管件生产厂家、煤气和自来水公司、专业施工单位等广泛使用，部分产品已远销海外市场。

The oscillation performance of jet, as oscillation frequency, is the essential data for designing the fluidic device, which is also the key factor that influence the coupling effect of fluidic device and receiving tube. This paper does experiment on the oscillation availability and frequency of feedback jet-oscillation gas wave refrigeration. As a conclusion, the jet oscillates only in a certain range of geometrical sizes and operating conditions. Under the condition of high pressure ratio, the frequency of the jet"s oscillation is only affected by the feedback tube"s length and chamber remarkably. Under the condition of low pressure ratio, the frequency descends with rise of the pressure ratio.

本文将跨音速正反馈射流振荡器与接受管耦合，对耦合后的射流振荡气波制冷机的可振性、振荡频率以及它们的影响因素作了实验研究，得出如下结论：射流只在一定的操作条件和几何结构尺寸范围内才能稳定振荡；射流的振荡频率在较高压比下只受反馈管长和反馈管容腔大小的显著影响，在小压比下随压比的增大而增加；其它结构尺寸和操作条件只影响可振性。

Gate wheel rotation, the gate blocking the cyclical round of gear issued by the infrared LED infrared radiation to the receiving component of a pipe and tube B, thus A and B outputs electrical pulses to control the mouse chip.

栅轮转动时，栅轮的轮齿周期性遮挡红外发光管发出的红外线照射到接收组件中的甲管和乙管，从而甲和乙输出端输出电脉冲至鼠标内控制芯片。

The result showed Indomethacin inhibited the formation of germ tube and hypha of candida albicans by dose dependence: indomethacin can inhibit 50% germ tube formation at 0.75mM level, while it can fully inhibit germ tube formation at 2.0mM level.

结果表明消炎痛对白色念珠菌芽管和菌丝形成的抑制作用与剂量相关：消炎痛浓度为0.75 mM时可抑制50%芽管形成，浓度为2.0mM时可完全抑制芽管和菌丝形成。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了