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vacuum pressure
相关语句
  相似匹配句对
     VACUUM BREAKDOWN
     真空击穿(一)
短句来源
     ON THE MEASURE OF VACUUM
     谈谈真空度的表述
短句来源
     pressure;
     压力;
短句来源
     From Pressure to Efficiency
     变压力为效率
短句来源
     Relive Pressure
     30分钟释放压力
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  vacuum pressure
Various parameters were examined, including vacuum pressure, submergence time, and drying conditions, and were studied using microscopy.
      
The influence of oxygen flow rate, vacuum pressure, and argon flow rate on process characteristics was analyzed and suggestions are made for improving the processing conditions.
      
These composites were prepared from beech-derived charcoal impregnated with titania sol by vacuum/pressure infiltration process.
      
A positive zeta potential of 42.56 mV has been attained with a charge modifier percentage of 100%, a stirring time of 30 minu., vacuum pressure of 15 cm Hg.
      
The films were bonded successfully at the vacuum pressure better than around 3×10-3 Pa with the shear strength larger than 50 MPa.
      
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A variable pressure tank which possesses the essential features of both a pressure tank and a vacuum tank and which can generate high-speed flow and high vacuum pressure has been presented herein. The speed and the pressure of flow can be regulated to a fairly large extent. It can be used for model test and for investigating the mechanisms of cavitation.The features of subsidiary facilities including air-removing vacuum tank, filter system, vacuum pumps and air conpressors are also briefly...

A variable pressure tank which possesses the essential features of both a pressure tank and a vacuum tank and which can generate high-speed flow and high vacuum pressure has been presented herein. The speed and the pressure of flow can be regulated to a fairly large extent. It can be used for model test and for investigating the mechanisms of cavitation.The features of subsidiary facilities including air-removing vacuum tank, filter system, vacuum pumps and air conpressors are also briefly given. It is described that new installations such as variable speed water pump with direct-current generator, large observing-windows with sealed entrance gate, manhole and water-spray mist-remover all have operated efficiently.

变压箱由提高试验流速入手,将高压箱和减压箱的特点集中在一个设备上,可造成较高的流速,较低的真空压力,使水流流速和压力可独立地在较大范围内变化。它既可用于工程试验又可作机理性研究,将这样组合的多功能设备称之为变压箱。文中还介绍各种附属设备,包括真空除气塔,微气泡发生器,滤水系统,真空与空压系统。还对直流电机无级变速拖动水泵,大型观测窗,大型密封门,快速人孔和喷水除雾刷等新技术,在运行应用上取得较好效果。

Processing problems including requirements of quartz raw materials, graphite crucibles, power supply, vacuum pump oil, melting schedule etc. which affect the production and quality of transparent silica glass tubes by vacuum-pressure method have been discussed.

讨论了采用真空加压法制造透明石英玻璃管的过程中,影响质量和产量的主要工艺因素,其中包括石英原料、石墨坩埚、配电、真空泵油、熔炼制度等方面的问题。

This paper first reports that the mechanism of electroluminescence (EL) excitation in ZnS:Tm thin film (TF) is different from that in ZnS:Er and ZnS:Tb TF. It appears that excitation energy transfers from some impure centers to Tm ions.The ZnS:Tm TF with ITO-Y2O3-ZnS:Tm -Y2O3-A1 structure is made by electron-beam evaporation. During the evaporation the vacuum pressure, the evaporation rate of ZnS:Tm layer, and the substrate temperature are 5×10-5 torr, 200A/min,and 160℃-200℃ respectively. The optimum Tm3+...

This paper first reports that the mechanism of electroluminescence (EL) excitation in ZnS:Tm thin film (TF) is different from that in ZnS:Er and ZnS:Tb TF. It appears that excitation energy transfers from some impure centers to Tm ions.The ZnS:Tm TF with ITO-Y2O3-ZnS:Tm -Y2O3-A1 structure is made by electron-beam evaporation. During the evaporation the vacuum pressure, the evaporation rate of ZnS:Tm layer, and the substrate temperature are 5×10-5 torr, 200A/min,and 160℃-200℃ respectively. The optimum Tm3+ ion concentration is approximately 2% by weight and the thickness of ZnS: Tm layer is in the range from 400nm to 600nm.The emission spectra of EL in ZnS:Tm TF depend on the dopant concentration as shown in Fig. 6. At low concentration (3×10-4 by weight) there is one broad band emission (from 390nm to 600nm). It is attributed by some impure centers. At high concentration (3×10-2 by weight) this band is suppressed and the spectra of ZnS:Tm TFEL show two groups of characteristic lines of Tm ion. One is the blue emission around 480nm lab-led I1 and the other is infrared around 800nm denoted by I2. I2 can be readily excited by 514nm (with the photo energy is about 1500cm-1 below the state 1G4, i.e. the state 1G4 can not be populated), and its spectrum structure is very similar to that of EL as show in Fig.5. On the other hand, the EL decay behaviors of I1 and I2 emission are quite different from each other. These indicate that I2 corresponds to the transition 3F4→3H6 instead of the transition 1G4→3J5.It is well-known that the EL of RE doped TF is generated by impact of hot electrons, therefore the ratio of the emission intensity between the short wavelength and long wavelength should increase with applied voltage such as in Fig.3(b) in ZnS:Er3+ TFEL. This does not happen, however, in ZnS:Tm as shown jn Fig,3(a), The excitation spectra of I1,I2 emission in ZnS:Tm TF is different from that of the 542nm emission which is the transition 5D4→7F5 in ZnS:Tb TF. In the former case there exist clearly excitation band around 340nm but in ZnS:Tb TF there is nothing there except the excitation peaks at 380nm and 486nm which can be attributed to excitation from ground lever to 5D3 and 5D4, as shown in Fig.8 (b,c and d). I1,I2 and the broad band of impure centers have similar excitation spectra around 340nm, as show in Fig.8(a, b,c). This indicates that energy might transfer from the broad band center to Tm ions.Time-resolved spectra confirms this hypothesis. ZnS:Tm TF is excited by voltage pulse of width 1μs. Time delayed EL spectra using a 0.2ns boxcar gate is shown in Fig.11. At 0.2μ's delay the spectrum is dominated by the broad luminescence band. The broad band decays rapidly in 5μs while the intensities of I1, I2, in the contrary, rise. It shows clearly that the energy transfers from the centers which emit the broad band to the Tm ions.It can be concluded that the excitation mechanism of EL of ZnS:Tm3+ TF is different from that of ZnS:Er3+ and ZnS:Tb3+ . In the latter case, Er3+ or Tb3+ ions are excited by impact of hot electron. In the case of ZnS:Tm TF there are some broad band emission centers which absorb energy from the electric field and transfer it to the Tm3+ ions. The characteristics of these broad band emitting centers are being discussed.

利用电子束蒸发方法制得ITO-Y_2O-3-ZnS:Tm~(3+)-Y_2O_3-Al结构的薄膜可以得到蓝色电致发光。本文首次报导了ZnS:Tm~(3+)薄膜与ZnS:Er~(3+)、ZnS:Tb~(3+)薄膜电致发光的激发过程有所不同。Tm~(3+)离子的激发可以通过某些杂质中心到Tm~(3+)离子的能量传递来实现。

 
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