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time
相关语句
  反应时间
    THE OPTIMUM RACTION TIME IN BATCH AND SEMI-BATCH REACTORS
    间歇与半间歇式反应器的最佳反应时间
短句来源
    AN INVESTIGATION ON CATIONIC POLYMERIZATION OF α-METHYLSTYRENE WITH Cl_2/TiCl_4 INITIATOR SYSTEM Ⅱ. EFFECTS OF PO1YMERIZATION TEMPERATURE, SOIVENT AND REACTION TIME
    Cl_2/TiCl_4体系引发α-甲基苯乙烯阳离子聚合的研究 Ⅱ.聚合温度、溶剂用量以及反应时间的影响
短句来源
    4-Tert-butylphenylboronic acid was synthesized with trimethyl borate and Grignard reagents which was prepared with 1-bromo-4-tert-butylbenzene and metal magnesium as raw materials under N2. An optimized process was obtained as follows: 1.5∶1molar ratio of 1-bromo-4-tert-butylbenzene to trimethyl borate,the temperature -20~-30℃,and the reaction time 140min. The final yield was 69.5%.
    以对叔丁基溴苯为原料,在氮气保护下,通过格氏反应合成了对叔丁基苯硼酸,考察了温度、反应时间和物料配比等因素对收率的影响,优化合成条件为:n(对叔丁基溴苯)∶n(硼酸三甲酯)=1∶1.5,反应温度为-20~-30℃,反应时间140min,总收率69.5%。
短句来源
    Methyl-furoate is synthesized from furfural by Cannizzaro reaction,acyl chloride reaction and esterification. It showed that the time of esterification is only 2.5 hours and the yield can reach 85.0%.
    以糠醛为起始原料,通过康尼查罗反应、酰氯化和酯化反应合成了糠酸甲酯,实验结果表明:酯化反应时间2.5h,糠酸甲酯收率可达85.0%。
短句来源
    The influences of medium alkalinity,solvents,reaction temperature and reaction time on the yield of the product were investigated.
    讨论了介质碱性、溶剂、反应温度和反应时间等工艺条件对产物收率的影响。
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  “time”译为未确定词的双语例句
    Residence Time Distribution Curve and Optimum Period of Catalyst Readdition
    RTD曲线与补加催化剂的最佳周期
短句来源
    Measurement of Residence Time Distribution(KTD)in Cold Texaco Gasifier(II)
    德士古气化炉冷态停留时间分布测试(II)
短句来源
    Effect of Gas-rate and Hold-up Time on Selective Absorption of H2S with High CO2 Component
    MDEA法中气速、气液比对高含量CO2气体选择性脱硫的影响
短句来源
    An Investigation on the Mixing Time and Mass Transfer in Double Mixed Gradientless Gas Liquid Contactor
    气液双搅拌无梯度反应器混合及传质特性的研究
短句来源
    Study on Prediction of Long-term Mechanical Behaviors for Polymers──(Ⅶ) Depedence of Different Shear Stress Level on Dimensional Stability and Life Time of PVC
    高聚物长时标力学行为的预测──(Ⅶ)不同剪切应力水平对PVC长时标尺寸稳定性和使用寿命的依赖性
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  time
The proof is based on a variant of Moser's method using time-dependent vector fields.
      
We present two-sided singular value estimates for a class of convolution-product operators related to time-frequency localization.
      
The Balian-Low theorem (BLT) is a key result in time-frequency analysis, originally stated by Balian and, independently, by Low, as: If a Gabor system $\{e^{2\pi imbt} \, g(t-na)\}_{m,n \in \mbox{\bf Z}}$
      
Gabor Time-Frequency Lattices and the Wexler-Raz Identity
      
Gabor time-frequency lattices are sets of functions of the form $g_{m \alpha , n \beta} (t) =e^{-2 \pi i \alpha m t}g(t-n \beta)$ generated from a given function $g(t)$ by discrete translations in time and frequency.
      
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A colorimetric method for the determination of antimony in the range 0.1 to 3.0μg per milliliter blood is described. The time needed for the destruction of organic matter is shortened to 8—12 minutes. The proposed method is as follows: Accurately transfer 1 ml of blood sample to a hard glass test tube (25×150 mm.), to which 1 ml of conc. HNO_3 is then added. Heat gently with a small flame till the solution changes to amber color. Add 0.5 ml conc. H_2SO_4 and heat again carefully until dense white fume...

A colorimetric method for the determination of antimony in the range 0.1 to 3.0μg per milliliter blood is described. The time needed for the destruction of organic matter is shortened to 8—12 minutes. The proposed method is as follows: Accurately transfer 1 ml of blood sample to a hard glass test tube (25×150 mm.), to which 1 ml of conc. HNO_3 is then added. Heat gently with a small flame till the solution changes to amber color. Add 0.5 ml conc. H_2SO_4 and heat again carefully until dense white fume is evolved. If the solution is not clear, add a few more drops of HNO_3 and heat repeatedly till a clear colorless solution is obtained. Cool, add 1 ml NaCl solution and 0.5 ml NaNO_2 solution, shake for 2 minutes, then add 1 ml of urea solution. Transfer the mixture to a separatory funnel containing 10.0 ml benzene. Wash the test tube with three portions (5 ml) of distilled water, add 10 drops of malachite green reagent solution and shake the mixture immediately for 5 minutes. Separate the benzene layer in a centrifuge tube and centrifuge 3 minutes to separate the suspended droplets of water. Transfer the benzene solution into a 10 cm cell and measure the extinction with an Ilford 607 filter, using benzene as blank.

作者等提出了血液中有机质的快速破坏法及采用孔雀綠比色法测定血样中微量锑。本法破坏血样所需时間为10分鐘左右,所需血样为1毫升。致謝:本文承儲俊民同志供給一部分資料及协助,謹此志謝。参加此項工作者尚有楊松成同志。

Effects of vulcanizing temperature and time on the physico-mechanical properties of wet-gel and dry-film of vulcanized natural latex were studied. The physico-mechanical properties of wet-gel became worse when the temperature or the degree of vulcanization was increased. The properties of dry-film were improved by increasing the degree of vulcanization and became worse on increasing the vulcanizing temperature (while the combined sulphur is constant). The differences in these properties between the wet-gel...

Effects of vulcanizing temperature and time on the physico-mechanical properties of wet-gel and dry-film of vulcanized natural latex were studied. The physico-mechanical properties of wet-gel became worse when the temperature or the degree of vulcanization was increased. The properties of dry-film were improved by increasing the degree of vulcanization and became worse on increasing the vulcanizing temperature (while the combined sulphur is constant). The differences in these properties between the wet-gel and dry-film were attributed to the difference in the mechanism of rupture, e.g., inter-globule for wet-gel and intraglobule for dry-film. The effect of vulcanizing temperature was explained by the non-uniform distribution of the intraglobule sulphur-bond in the latex.

本文研究了硫化温度及硫化时间对凝胶及胶膜性能的影响,并进一步探索了影响的原因。 实验结果表明:随着硫化程度的加深,凝胶性能逐渐变坏;而胶膜性能则明显变好。当硫化温度增高时(结合硫量相同),凝胶及胶膜性能均显著变坏。至于其变异原因,前者可以用凝胶及胶膜的断裂机理不同来解释,即凝胶断裂系通过粒子之间,而胶膜断裂则系通过粒子内部。至于后者,系由于硫化温度改变了硫化速度,从而使胶乳粒子内部硫键分布不均所致。

A countercurrent distribution apparatus is described. It is more compact than the apparatus of Craig and Post. It can take a large number of tubes with greater capacity in the extraction train, and permits close mounting in compact racks. A 100-tube extraction train of 100 ml capacity (50 ml upper and 50 ml lower phases) per tube occupies a space of 28×55×40 cm. The tube shown in figure 1 (1), (2) is made from 2.8×55 cm glass tubing. "A"is a reservoir (more than 50 ml), "B"is an equilibration cell, approximately...

A countercurrent distribution apparatus is described. It is more compact than the apparatus of Craig and Post. It can take a large number of tubes with greater capacity in the extraction train, and permits close mounting in compact racks. A 100-tube extraction train of 100 ml capacity (50 ml upper and 50 ml lower phases) per tube occupies a space of 28×55×40 cm. The tube shown in figure 1 (1), (2) is made from 2.8×55 cm glass tubing. "A"is a reservoir (more than 50 ml), "B"is an equilibration cell, approximately 200 ml in volume, the length of the lower part of the cell is adjusted to 50 ml in volume at the time of construction. All the tubes in the apparatus are joined together through "b"and "a"by glass tubing. The extraction train consists of 10 frames of 10 tubes each mounted in a rack rotating on a main shaft, as shown in figure 3. A filling dipper shown in figure 1, (3) is joined to "b"'of the first tube.

本文設計了一种管状的逆流分配器,每支可容100毫升溶剂(移动相与固定相各50毫升)分配,100支折迭构成立方体装置,占28×55×40厘米.

 
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