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vacuum pressure     
相关语句
  真空度
     The running parameters are: reflux rate 0.5,feed rate 5.9 ml/min, operating vacuum pressure 8.0×104Pa and D/F 0.150;
     操作参数:回流比0.5,操作真空度在8.0×104Pa,进料量5.9ml/min,D/F为0.150;
短句来源
     Its operating vacuum pressure is 300μPa.
     该源的工作真空度为300μPa。
短句来源
     Considering the drying rate and quality of MVD scallop, the operation parameters of vacuum pressure, power of microwave and on/Off ratio should be kept at >0.088 MPa, 3.0 -3.6 w/g and 0.25-0.33, respectively.
     提高扇贝柱微波真空干燥速度和干燥品质的最优参数组合为:真空度>0.088 MPa、微波功率3.0~3.6 w/g和启闭比0.25~0.33。
短句来源
     When the VO_2 was heated at a rate less than 10 ℃/h to the temperature of 1350 ℃ and its vacuum pressure kept at 10~(-6)atm,the electrical resistance of VO_2 layer mutate significantly up to 4~5 orders of magnitude,at the temperature of 68 ℃,the hysterisis of which is 1 ℃~2 ℃.
     当熔体以小于10℃/h的升温速率加热到1350℃,真空度控制为10-6atm,所获得的沉积层的电阻突变量级达到最大为4~5,相变温度为68℃,相变温度滞后为1℃~2℃。
短句来源
     Thebombardment parameters: the Helium pressure of 1300 psi, the bombardment distance of 9cm, and the vacuum pressure of about 27~28 inches Hg.
     轰击参数:飞行距离9cm,真空度27~28inHg,气压1300psi。
短句来源
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  真空压力
     Studies on the Fabricating Process of SiC Particle Preforms for SiC_p/LY12 Composite in Vacuum Pressure Infiltration Techniques
     SiC_P/LY12复合材料真空压力浸渗法中预制件制备工艺研究
短句来源
     The results were that: thickness of sample: 10mm, final temperature of freeze drying:-30 ℃, temperature of steam catcher:-45 ℃, vacuum pressure:15 Pa, temperature sublimation≤-5 ℃, temperature of resolution≤20 ℃ and sucrose(10 g/L) and mannitol (40 g/L), the dual-protective additive were added at the same time.
     结果表明,装液厚度10mm,冻结终点温度-30℃,冷阱温度-45℃,真空压力15Pa,升华温度≤-5℃,解析温度≤20℃,同时添加二元保护剂:蔗糖(10g/L)与甘露醇(40g/L)。
短句来源
     The curve of storage time will be abnormal after the Si_3N_4 film of 70nm is deposited at vacuum pressure of 60.71Pa,but the storage time of MOS capacitor can reach over 400s after annealed by 40min in the oxygen atmosphere at 900℃.
     在60.71 Pa真空压力下,淀积70 nm厚Si3N4薄膜后,MOS电容器存储时间曲线不正常,经900℃O2气氛退火40 min,曲线恢复正常,MOS电容器存储时间达到400 s以上。
短句来源
     Preparation and Thermal Expansion Propertise of SiC_P/Al Composites by Vacuum Pressure Infiltration Precess
     真空压力浸渗法制备SiC_P/Al复合材料及热膨胀性能研究
短句来源
     The storage time of MOS capacitor turns to zero after Si_3N_4 film thickness of 70nm is deposited at 850℃ and vacuum pressure of 50Pa.
     在50 Pa真空压力下,通过淀积70 nm厚Si3N4薄膜后,MOS电容器无存储时间。
短句来源
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  真空加压
     The Application of PLC in Tar-Asphalt Impregnated System Under Vacuum Pressure
     PLC在真空加压焦油沥青浸渍系统中的应用
短句来源
     Chinese Fir Wood Modification with PVA & MF Vacuum pressure Impregnating Treatment
     杉木的PVA、MF真空加压浸渍改性试验
短句来源
     Development of the Vacuum Pressure Type Dejectas Collection Equipment
     真空加压式集便装置的研制
短句来源
     Application of casting impregnation technique, vacuum pressure impregnation technological process and operational attentions as well as design and calculation of such equipment have been described.
     介绍了铸件浸渗技术的应用、真空加压浸渗的工艺过程及操作注意事项,同时还介绍了真空加压浸渗设备主要部件的设计与计算。
短句来源
     In vacuum pressure treatment test, the result indicated that F2 could prevent the treated timber for 12 days from stain and mold except white mold;
     在真空加压试验中 ,0 .0 2 % F2可保持橡胶木板材在气干过程中 12天基本不霉变及蓝变 ,但对白霉的防治效果较差 ;
短句来源
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  真空压
     So, the vacuum desiccation is the firstly elected method of dryness for the microcapsule, and temperature is 40°C, vacuum pressure is 8×10~3Pa, drying time is 5h.
     真空干燥作为微胶囊产品干燥的首选干燥方式,干燥温度为40℃,真空压为8×10~3Pa,干燥时间5h。
短句来源
     Study on Manufacturing Aluminium Matrix Composites for Electronic Packaging Using Vacuum Pressure infiltration Casting
     真空压渗铸造铝基电子封装复合材料研究
短句来源
     Application of Vacuum Pressure Difference Method in Testing Defects of Brake Chief-pump' s Cylinder
     真空压差法在制动总泵缸体缺陷检测中的应用
短句来源
     Calculation and Experiment on Cavity Vacuum Pressure in Vacuum Die Casting Process
     真空压铸中型腔真空压力的理论计算及试验研究
短句来源
     The impregnation velocity of the glycerol is faster than that of the phenol aldehyde solution at 5kPa and 20kPa vacuum pressure,while the phenol(aldehyde) solution is faster than the glycerol at 40kPa and 60kPa.
     在5 kPa和20 kPa真空压作用下丙三醇的渗透速率快于酚醛溶液; 在40 kPa和60 kPa真空压力下,酚醛溶液的渗透速率快于丙三醇。
短句来源
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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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