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yield protection
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  保产
     The critical period of weed control was 18-30 days after soybean sowied. The highest effectiveness of soybean yield protection was obtained with one weeding on this critical period.
     大豆田杂草防除临界期为大豆播后18~30天,在此期内除草一次,保产效果最佳。
短句来源
     This experimant was conducted to compare the effectiveness of weeding time after soybean sowing for soybean yield protection continual observation on the dynamics of weed growth in soybean fields was undertaken.
     本试验通过系统观察大豆田杂草消长规律,对大豆播后不同时期人工除草的保产效果进行了对比试验研究。
短句来源
  “yield protection”译为未确定词的双语例句
     High Yield Protection of Purine Ribonucleosides for Phosphoramidite RNA Sythesis
     制备磷酰胺RNA核糖核苷酸嘌呤的高区域保护
短句来源
     Objective: To make of high yield protection of purine ribonucleosides for phosphoramidite RNA sythesis.
     目的:制备磷酰胺RNA核糖核苷酸嘌呤的高区域保护。
短句来源
  相似匹配句对
     On the Protection of Librarianship
     试论图书馆事业的保护
短句来源
     Protection targets;
     保护重点目标;
短句来源
     and the yield raised.
     并有一定的防虫增产效果。
     The yield is 65%.
     产品收率为65%。
短句来源
     High Yield Protection of Purine Ribonucleosides for Phosphoramidite RNA Sythesis
     制备磷酰胺RNA核糖核苷酸嘌呤的高区域保护
短句来源
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Weed encroachment is one of the main factors that decrease soybean yield. This experimant was conducted to compare the effectiveness of weeding time after soybean sowing for soybean yield protection continual observation on the dynamics of weed growth in soybean fields was undertaken. The result showed that there were two peak periods of weed emergence in soybean fields in Nantong region and the two periods were 18-30 days and 37-48 days after soybean sowing prespectively. The critical period of weed control...

Weed encroachment is one of the main factors that decrease soybean yield. This experimant was conducted to compare the effectiveness of weeding time after soybean sowing for soybean yield protection continual observation on the dynamics of weed growth in soybean fields was undertaken. The result showed that there were two peak periods of weed emergence in soybean fields in Nantong region and the two periods were 18-30 days and 37-48 days after soybean sowing prespectively. The critical period of weed control was 18-30 days after soybean sowied. The highest effectiveness of soybean yield protection was obtained with one weeding on this critical period.

草害是造成大豆减产的主要因素之一。本试验通过系统观察大豆田杂草消长规律,对大豆播后不同时期人工除草的保产效果进行了对比试验研究。结果表明:本地大豆田杂草有两个发草高峰,出现时间分别在大豆播后18~30天和37~48天。大豆田杂草防除临界期为大豆播后18~30天,在此期内除草一次,保产效果最佳。

Microwave-technology was used to enhance the dispersion of nano-ZnO powder in polyacrylamide (PAM) colloid. The PAM colloid was obtained by dissolving PAM powder into the solvents of water and methanol. The powder of nano-ZnO was put into the PAM colloid with a certain content. The dispersion of nano-ZnO powder in the colloid of PAM was carried out in the field of microwave with stirring under the conditions of microwave power 400~500W, stirring time 30 min and stirring rate 600 r?min-1. The characterization...

Microwave-technology was used to enhance the dispersion of nano-ZnO powder in polyacrylamide (PAM) colloid. The PAM colloid was obtained by dissolving PAM powder into the solvents of water and methanol. The powder of nano-ZnO was put into the PAM colloid with a certain content. The dispersion of nano-ZnO powder in the colloid of PAM was carried out in the field of microwave with stirring under the conditions of microwave power 400~500W, stirring time 30 min and stirring rate 600 r?min-1. The characterization of the dispersion of nano-ZnO powder in the colloid of PAM was done by TEM. The TEM photos of nano-ZnO particles in PAM colloid showed that under the condition of microwave-induced dispersion, the content of the aggregation of nano-ZnO particles in PAM colloid is very low compared with that in the condition of stirring dispersion. After the microwave-induced dispersion, the sizes of the most of nano-ZnO particles in PAM colloid are among 40~70nm. It is suggested that in the field of microwave the microcrystals on the surface of nano-ZnO may absorb ions or groups with charge, yielding protection layer, therefore prohibit the aggregation of nano-ZnO particles in PAM colloid.

用水和甲醇溶解聚丙烯酰胺(PAM)粉末制备 PAM 乳胶液,将纳米氧化锌粉体按一定量的比例加入 PAM 乳胶液中,在微波场中进行纳米氧化锌粉体在 PAM 乳胶液中的分散性能研究。实验条件为:微波功率 400~500 W, 搅拌时间 30 min,搅拌强度 600 r?min?1。用 TEM 技术进行纳米氧化锌粉体在 PAM 乳胶液中的分散性能表征。 PAM乳胶液中纳米 ZnO 颗粒的 TEM 照片(放大 58×103~100×103倍)表明,在微波场作用下,纳米氧化锌颗粒在 PAM 乳胶液中团聚程度非常小,大部分颗粒的粒径在 40~70nm 范围内。微波作用能够显著改善纳米 ZnO 粉体在 PAM 乳胶液中的分散性能的机理被认为是,在微波场作用下,纳米 ZnO 颗粒表面上的微晶俘获或束缚周围的空间电荷或带电离子和基团,使其附在纳米 ZnO 颗粒的表面形成保护层,从而抑制了纳米 ZnO 粉体在 PAM 乳胶液中的团聚。

Objective: To make of high yield protection of purine ribonucleosides for phosphoramidite RNA sythesis. Methods: Base on a reaction which allows concomitant highly regiospecific 2 - silylation and 3 - phosphitylation. Subsequent cleavage of the H - phosphonatd monoester moiety without sily migration provides intermediates ready for phosohitylation by standards methods to give fully protected phosphoramidites. Results: With both nucleosides we use transient protection of the 2, 3diol moiety of the...

Objective: To make of high yield protection of purine ribonucleosides for phosphoramidite RNA sythesis. Methods: Base on a reaction which allows concomitant highly regiospecific 2 - silylation and 3 - phosphitylation. Subsequent cleavage of the H - phosphonatd monoester moiety without sily migration provides intermediates ready for phosohitylation by standards methods to give fully protected phosphoramidites. Results: With both nucleosides we use transient protection of the 2, 3diol moiety of the ribonucleosides by reaction with N, N - dimethylformamide dimethylacetal to prevent the small, but potentially troublesome tritylation of the 2 - hydroxyl that otherwise accompanies tritylation of the 5 - hydroxyl. Conclusion:The procedures reported guanosine only in order of introduction of the phenoxyacetyl amino protecting group. Despite the significant progress on use of amino- unprotected monomers in phosphoramidite synthesis, complications remain, and we chose to use amino protection.

目的:制备磷酰胺RNA核糖核苷酸嘌呤的高区域保护。方法:用一氢磷酰盐的方法来保护RNA甲硅烷基化合成的反应。结果:以鸟苷为原料生成苯氧乙酰胺来保护羟基,合成RNA中间体,通过液相图谱的方法来检验合成的物质。结论:本实验方法是基于二位的羟基是高区域专一的硅烷化作用,为了更有效的使羟基硅烷化用磷酰胺的方法,我们以前是定量的使一氢磷酰脂分裂,没有甲硅烷基的转化,除此之外,相同的方法,高区域专业用阻止硅烷化和磷酰化的方法。

 
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