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under high vacuum
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  在高真空
     Using traditional catalyst system, the experiment results show that when the proportion of n(PDO)/n(DMT) is 2.2/1, the dosage of (AcO)_2Zn between 400~600 μg, reaction temperature at 220 ℃,the transesterification is faster while when the dosage of Sb_2O_3 about 500 μg, reaction temperature at 265 ℃, under high vacuum, the molecular mass of PTT is much better.
     实验结果指出,采用传统催化剂体系当原料配比n(PDO)/n(DMT)=2.2/1时,1gDMT的酯交换催化剂醋酸锌为400~600μg,反应温度为220℃时,酯交换反应速率较快; 1gDMT的缩聚催化剂三氧化二锑为500μg,反应温度为265℃,在高真空下,可得较高摩尔质量的PTT。
短句来源
     Under high vacuum condition,using 1.06μm YAG pulse laser abating Al target,some AlⅠ,AlⅡ and AlⅢ spectra were observed.
     用 YAG脉冲 1 .0 6μm激光 ,在高真空轰下击 Al靶 ,观测到 Al ,Al 和 Al 等离子体的若干谱线。
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     The pulsed laser with 193 nm wavelength is employed to prepare Ba0.5Sr0.5TiO3 film under high vacuum condition.
     使用193nm脉冲激光在高真空条件下沉积Ba0.5Sr0.5TiO3(BST)薄膜,通过观测薄膜形成的等厚干涉条纹,发现溅射光斑形状对膜层厚度分布有显著影响.
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     The grafting reaction of SnR4 onto the supercages of HY zeolite was studied under high vacuum condition, and the chemical composition and structure of resulted solid were characterized by in situ FT-IR, XRD, UV-Vis DRS, TPR, TPD, TG, BET, ICP, elemental analysis, gas chromatography, adsorption of nitrogen and hydrocarbons etc.
     在高真空系统中研究了HY沸石分子筛与SnMe4、SnEt4、SnPr4和SnBu4的反应,用元素分析、ICP、GC、XRD、FTIR、TG、DRS、TPR、BET及烷烃和芳烃的脉冲吸附等方法表征了产物的组成、结构和性质。
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     A 200 nm thick Ti film was grown on a polished AlN ceramic substate at 200℃ by electron beam evaporation,and annealed under high vacuum conditions.
     采用电子束蒸发方法在200℃的抛光AlN陶瓷衬底上淀积厚度为22nm的Ti膜,并在高真空中退火。
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  “under high vacuum”译为未确定词的双语例句
     The grafting reaction of SnMe_4 onto the supercages of HY zeolite was studied under high vacuum condition, and the chemical composition and structure of resulting solid were characterized by in situ FT-IR, XRD, UV-Vis, DRS, DTG, DTA, N_2 adsorption, ICP, elemental analysis, and gas chromatography.
     研究了高真空条件下SnMe4在HY沸石超笼的接枝反应 ,并用元素分析 ,ICP ,GC ,XRD ,FTIR ,DTG ,DTA ,UV vis ,DRS ,N2 吸附等方法对产物的组成、结构和性质进行了详细表征 .
短句来源
     With environmental simulation experiments in the ground,surface elements of high modules carbon fiber/epoxy modified cyanate ester resin composite(M40J/CE/EP) are analyzed. Outgassing properties in vacuum and gas compositions of composite under high vacuum and heating environment are also studied.
     通过地面环境模拟实验,分析了高模碳纤维/环氧树脂改性氰酸酯复合材料(M40 J/CE/EP)的表面元素,研究了高真空加热环境下复合材料的真空出气性能和出气气体成分。
短句来源
     The grafting reaction of Cp2Fe with Br)nsted acid sites in HY zeolite supercages was studied under high vacuum condition. The chemical composition, structure and property of the grafted sample were character- ized by in situ FTIR, ICP, XRD, TPD-MS and UV-Vis DRS.
     在真空条件下研究了Cp2Fe在HY沸石表面的接枝反应,并用原位FTIR、ICP、XRD、TPD-MS和UV-VisDRS等方法对接枝产物的组成、结构及性质进行了表征。
短句来源
     Individual raw CuO can be converted mostly into Cu_2O after heating at 400℃ under high vacuum,while in newly prepared superconductor at the same conditions only a small portion of Cu~(2+)ions are converted to Cu~(1+) ions.
     原料 CuO 在真空中在400℃加热后大部分被还原成 Cu_2O;
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     The laboratorial data show that the voltages are independent of the gas pressure under high vacuum(10-4~10-1 Pa).
     研究发现,当气压位于高真空区域(10-4~10-1Pa)时,随着气压的改变,绝缘闪络电压无明显变化,基本保持恒定。
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  相似匹配句对
     Conductance under high pressure
     高压电导研究
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     ELECTROLUMINESCENCE UNDER HIGH ELECTRIC FIELD
     高场下的电致发光
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     the vacuum operates;
     真空运转;
短句来源
     On the frying in vacuum
     真空油炸技术
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     Vacuum Cleaner
     吸尘器
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  under high vacuum
A new approach, the thermal evaporation of25MgO under high vacuum onto a crystalline substrate (oxide, silicate), produces a 1000 ? thick25MgOx (x>amp;lt;1) thin film.
      
Catalytic coal gasification was studied by using thermal desorption spectroscopy (TDS) under high vacuum conditions.
      
The alloys were arc melted from high purity materials and heat-treated at 1700 °C under high vacuum.
      
The Cd whiskers that have submicron diameters and lengths of several hundred microns to millimeters can grow in several days under high vacuum.
      
During rapid thermal annealing at 665°C, under high vacuum, the Si grains grow linearly with increasing temperature and reach an average size of 95 nm after 20 sec.
      
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In this paper we study the kinetics of the butadiene-n-buli-toluene poly- merization system by means of dilatometers under high vacuum,and measure the microstructures of the polymers by infra-red analysis. The reaction order of initial rate of reaction with respect to monomer, the reaction order of rate of reaction with respect to initiator concentration are measured, and the appa- rent energy of activation of the propagation rate is determined. The 1. 2 structure of the polymer is independent of conc.of...

In this paper we study the kinetics of the butadiene-n-buli-toluene poly- merization system by means of dilatometers under high vacuum,and measure the microstructures of the polymers by infra-red analysis. The reaction order of initial rate of reaction with respect to monomer, the reaction order of rate of reaction with respect to initiator concentration are measured, and the appa- rent energy of activation of the propagation rate is determined. The 1. 2 structure of the polymer is independent of conc.of initiator. It is about 12%. Based on these results and the results obtained from viscosimetry measurements, we suggest a mechanism of propagation, where the monomeric butadienyl- lithium is considered as the main active center.

本工作是在高真空下用膨胀计法研究了正丁基锂-甲苯-丁二烯聚合体系动力学, 并测量了高聚物的微观结构。测定了本反应对单体、引发剂浓度的反应级数,及增长 反应表观活化能,高聚物的1,2结构在12%左右,与引发剂浓度无关。根据这些结 果,并结合甲苯中聚丁二烯基锂的缔合度测定,提出了一种增长反应机理,其中单量 体丁二烯锂是主要活性中心。

The measurement of the total emissivity of a solid surface in the black cavity which is immersed in liquid nitrogen and under high vacuum (10-6 torr) by steady caloric method is described. The data are processed by extrapolation method so that the emissivity obtained is of high accuracy owing to the accurate results in the measurement of the thermal equilibrium temperature on the surfaces of the samples. The influence of the degree of vacuum on the total emissivity is discussed.

本文提出了一个真空度为10~(-6)毫米汞柱,黑体腔四周浸泡在液氮中的固体的表面热辐射率的测定方法.在数据处理上采用了动态外推法,使试件表面热平衡温度的测试有着很高的精度,从而提高了热辐射率的精确度.本文还分析了不同真空度对热辐射率的影响.

Using the statistic of living binary copolymer to treat the product of first method, we get the distribution of MW and degree of branching with different MW of Prepolymer.In the system of living polystyrene, p-DVB and benzene, we synthesize star polymer under high vacuum.In definite range of temperature, concentration of active species, experience data reveals: coefficient of polydispersity concids with theoretical result, furthermore no matter how wide MWD of prepolymer we have, the MWD of product still...

Using the statistic of living binary copolymer to treat the product of first method, we get the distribution of MW and degree of branching with different MW of Prepolymer.In the system of living polystyrene, p-DVB and benzene, we synthesize star polymer under high vacuum.In definite range of temperature, concentration of active species, experience data reveals: coefficient of polydispersity concids with theoretical result, furthermore no matter how wide MWD of prepolymer we have, the MWD of product still remains relative narrow. The degree of branching depends on initial material ratio (A=M0/I0) and the conversion of DVB's second double bonds for branching fx. The relatinship is expressed by Eq. (10). As initial A increase, MWD is Broaden and deviation from Eq. (10) appears. The reason is there are some crosslinking took place between star polymers. Finally, gel point is reached. The critical ratio is 9 for low MW of living polymer, for high MW prepolymer, critical ratio shall be increased.In short, the model of living binary copolymer is good for treating star polymer in low initial ratio, it needs some correction for high ratio.

本文以二元活性共聚物的模型来处理星形高聚物结合点的二乙烯苯凝胶,参考了活性二元共聚物的统计理论,得到了活性预聚物与二乙烯苯的反应产物的分子量与支化度的分布函数。在活性聚苯乙烯、对位二乙烯苯、正丁基锂与苯的反应体系中,进行了实验验证。结果表明:在配料比不大的情况下,理论分析与实验结果基本一致。在上述理论分析基础上,结合实验数据,得到了两个分布参数以及控制支化度及支化度分布的规律。

 
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