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yield of     
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  产量
     Study on the Characteristics of Photosynthetic and It's Relationship with Yield of Soybean Varieties
     大豆品种光合特性及其与产量关系的研究
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     Effects of 1,2,4-Trichlorobenzene and Naphthalene on the Growth and Grain Yield of Rice and Their Mechanism
     1,2,4-三氯苯和萘对水稻生长和产量的影响及其机理研究
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     THE EFFECT OF WATER STORAGE IN DEEP SOIL LAYER ON THE GROWTH AND YIELD OF WHEAT PLANT
     土壤深层储水对小麦产量效应的研究
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     EFFECTS OF CLIMATIC CONDITIONS ON THE YIELD OF RAPESEEDS
     气候条件对油菜产量的影响
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     STUDIES ON EFFECT OF TRIFLURALINE ON NODULATION, NITROGEN FIXATION AND YIELD OF SOYBEAN
     除草剂氟乐灵对大豆结瘤、固氮和生育产量影响的研究
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  收率
     THE STUDY OF THE QUANTUM YIELD OF HYDROGEN GENERATION FROM SOME CATALYTIC PHOTOREDUCTION SYSTEM OF WATER
     几种光还原水催化体系产氢量子收率的研究
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     INFLUENCE OF SOME FACTORS ON THE QUANTUM YIELD OF HYDROGEN PHOTOGENERATION
     若干因素对催化光还原水产氢的量子收率的影响
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     A STUDY ON THE QUANTUM YIELD OF HYDROGEN GENERATION FOR SEVERAL CATALYTIC SYSTEMS FOR THE PHOTOREDUCTION OF WATER(Ⅱ)
     几种光还原水催化体系产氢量子收率的研究(Ⅱ)
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     OPTIMIZATION OF THE TOTAL YIELD OF CONSECUTIVE EQUILIBRIUM REACTIONS
     连串、平衡反应工程收率最优化
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     Relation between Strnctural Viscosity and Distillation Yield of Petroleum Dispersion System
     石油分散体系的结构粘度与其蒸馏收率的关系
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  产率
     A Study on the Polymeric Triplet Photosensitizers Ⅳ. The Problems of Spectrum, Quantum Yield of Phosphorescence, Photosensitization and Photostabilization of Polymeric Acetophenone and Its Derivatives
     高分子三重态敏化剂的研究——Ⅳ.高分子苯乙酮及其衍生物的光谱、磷光量子产率及光敏化光稳定问题的研究
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     The yield of DMF can reach 78.6% under the optimal reaction conditions.
     试验证明,在最优条件下,富马酸二甲酯的产率可达到78.6%。
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     The formation of δ-lactam was basically eliminated during the synthetic reaction,leading to a total yield of N-Fmoc-L-βArg(Pmc)-OH reaching up to 85%.
     以Pmc保护胍基,反应中基本上消除了δ-内酰胺的生成,获得了产率较高的N-Fmoc-L--βArg(Pmc)-OH。
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     The results showed that when the molar ratio of phenol to ceric ammonium nitrate was 1∶1.05,the yield of 2,4-dinitrophenol was 72% at a reaction temperature of 50 ℃ and a reaction time of 1.5 h.
     最佳反应条件为:苯酚与硝酸铈铵的物质的量比为1∶1.05,反应温度为50℃,反应时间为1.5 h,产率达72%。
短句来源
     The yield of furil increased to 91.7%(from 2-furaldehyde) after improvements in experimental procedure.
     通过改进实验条件,使合成糠偶酰的产率提高到91.7%。
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  收率为
     The total yield of propiconazole was as high as 69.5%,and the product content was 95.0%.
     丙环唑的总收率为69.5%(以2,4-二氯苯乙酮计),产品含量95.0%。 产物结构经IR、1HNMR和MS表征。
短句来源
     3'-Acetoxy-4'-β-hydroxyl-propyloxy-3',4'-dihydroseselin can be selectively isolated from the crude of BAIHUAQIANHU simply and rapidly using 1,1,6,6-tetraphenylhexa-2,4-diyne-1,6-diol as host with yield of 0.17%.
     以1,1,6,6-四苯基-2,4-己二炔-1,6-二醇为主体分子,可简单、迅速地从白花前胡粗提物中选择分离有效成分3'-乙酰氧基-4'-β-羟基丙酰氧基-3',4'-二氢邪蒿内酯,收率为0.17%.
短句来源
     The results show: manufacture's cycle became shorter,cost became lower and purity became higher; the yield of product is 66.4 %,manufacture's cycle is 4 hours,purity>99.5 %.
     实验表明:产品总收率为66.4%,生产周期为4 h,纯度>99.5%,缩短了生产周期,提高了产品质量。
短句来源
     By a single factor test, effects of reactants ratio, microwave power and irradiation time etc. on reaction were studied. Under optimal reaction conditions∶n (2-naphthol)∶n (sodium hydroxide):n (chloroacetic acid)=1∶1.7∶2.0, microwave power 320 W and irradiation time 5 min, yield of 2-naphthoxyacetic acid reached 67.7 %.
     考察了反应物的摩尔比、微波功率、辐射时间等因素对反应的影响,实验结果表明,当2-萘酚、氢氧化钠和氯乙酸的摩尔比为1∶1.7∶2.0,微波功率为320W、辐射时间为5min时,2-萘氧乙酸的收率为67.7%。
短句来源
     when n(2-methyl-1-phenyl-1-pentanone)/n(CCl4) is 1.0∶1.8,tetrabutyl ammonium bromide is 6 g,mass fraction of sodium hydroxide is 20% and reaction time is 5 h,the yield of 2methyl-2-hydroxy-1-phenyl-1-pentanone can be up to 91%.
     当2-甲基-1-苯基-1-戊酮与四氯化碳的物质的量比为1.0∶1.8、四丁基溴化铵用量为6 g、质量分数为20%的NaOH溶液、反应时间为5 h时,2-甲基-2-羟基-1-苯基-1-戊酮的收率为91.2%。
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      yield of
    The yield of glutaric dialdehyde by this method can reach 73%.
          
    The yield of the final product was 78%, and the melting point was 231-233°C.
          
    Effect of the reaction time, mole ratio of reactants, and amount of catalyst on the yield of benzodioxoles were investigated.
          
    We now use low-cost L-lysine as starting material, succeed in raising the yield of Compound A to about 66%, and characterize it.
          
    The synthesis involved condensation, cyclization and bromination with a total yield of 60%.
          
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    In order to determine the practical value of the Bordeaux mixture as acontrol measure for the cotton leafhopper, a field experiment was designedand carried out in 1943 at Shatang, Liuchow, Kwangsi. Three known effective contact poisons, namely, a water suspension ofYam bean seed power (Gross Smith value 1%) (1:1000), a water suspension ofpyrethrum powder (1:600), and a water extract of tobacco (Nicotine content2.35%) (1:100) were applied at the same time with two types of Bordeauxmixture (4-6-50 and 2-4-50)...

    In order to determine the practical value of the Bordeaux mixture as acontrol measure for the cotton leafhopper, a field experiment was designedand carried out in 1943 at Shatang, Liuchow, Kwangsi. Three known effective contact poisons, namely, a water suspension ofYam bean seed power (Gross Smith value 1%) (1:1000), a water suspension ofpyrethrum powder (1:600), and a water extract of tobacco (Nicotine content2.35%) (1:100) were applied at the same time with two types of Bordeauxmixture (4-6-50 and 2-4-50) for four applications at a fifteen-day intervalduring the early growth season of cotton from June 15 to July 30. The popula-tion of leafhopper, the degree of infestation, the number of green bolls andthe yield of lint cotton were statistically analyzed and discussed. Population observations showed that the three contact poisons greatlyreduced the leafhopper population on the first day after application. Butthey soon lost their effectiveness three days later, so that the population startedto rebuild up and was practically with no significant difference from that ofhe untreated plots at the end of the fifteen-day interval. While the Bordeaux mixture showed a maximum reduction of population on the third day afterapplication, and maintained its effectiveness for a considerable time; the pop-ulation was constantly checked to such an extent that no serious damage wouldoccur during the spray interval. The degree of infestation as indicated by the symptom of cyrtosis onleaves was 40.83, 47.21, 55.85, 57.66, 62.48, and 60.39 per cent in average for4-6-50 Bordeaux mixture, 2-4-50 Bordeaux mixture, yam bean seed powdersuspension, pyrethrum powder suspension and tobacco water extract and theuntreated check plots respectively. Moreover, the percentage of heavily in-fested plants for the treated and untreated plots in the fore-mentioned orderwas 5.61, 8.24, 21.88, 23.68, 28.88 and 25.27 respectively.It was evident thatin the long run the Bordeaux mixture was the most effective insecticide inreducing the degree of infestation. The number of bolls per plant was 15.27, 13.24, 10.17, 9.53, 8.75 and6.75 in average, and the yield of lint cotton was 19.50, 17.84, 11.69, 10.11and 6.24 catties per mou (1 catty=0.5 kilogram, 1 mou=0.164 acre) for thetwo types of Bordeaux mixture and three kinds of contact poisons and theuntreated check plots respectively. The yield of cotton was generally much lower in 1943 than in 1942 forthe same experimental field. This was apparently due to the poorer soilfertility and heavier leafhopper infestation in 1943. But the ratio of the yieldbetween the Bordeaux mixture treated plots and the check plots was quitedifferent in the two years, i.e. 55.62 to 31 catties per mou in 1942, and 19.50to 6.24 catties per mou in 1943. This revealed a fact that the Bordeauxmixture treatment will he applied more effectively and profitably where thecotton field is not fertile and when the leafhopper outbreak is severe. 4-6-50 Bordeaux mixture and 2-4-50 Bordeaux mixture were in all casesinsignificantly different in their effectiveness. Theiefore a 2-4-50 Bordeauxmixture would be a more economical and practical measure for the cottonleafhopper control.

    (一)本试验应用三种防治棉浮(鹿土)子之有效接触剂,烟草、除虫菊、及豆薯种子,与两种配合式之波尔多液;4—6—50式及2—4—50式,同时在棉田内每半月施用一次,自六月半至七月底共施用四次。比较其消减虫口,减轻受害程度及增加产量诸功能,藉以证明波尔多液之特性。 (二)1000倍豆薯种子粉悬液、600倍除虫菊粉悬液、及100倍烟草水,三者不论在消减虫口,减轻受害程度,以及增加产量各方面,其功能均相若,无显著差异。 (三)4—6—50式波尔多液与2—4—50式波尔多液,对于治虫、减害及增产各功能,亦无显著差异。 (四)豆薯种子粉悬液、除虫菊粉悬液、及烟草水三种接触剂经施用后一天之治虫效力,均显较波尔多液为优,惟至第三天,差异便不显著,三天以后,波尔多液之功效反日见优越。此显示波尔多液之持久特性。 (五)棉浮(鹿土)子之虫口发生愈多,则波尔多液之功效愈著。因其效力持久,所抑制之虫口可还较接触剂为低。 (六)波尔多液减轻棉叶之受害程度,因其药效持久,附属牢固,保护力强,故亦较三种接触剂为优。 (七)施用波尔多液后,结铃数显然增加。其功效亦优于三种接触剂。 (八)施用波尔多液后,每亩皮棉产量亦显著增加。本年结果,施用4...

    (一)本试验应用三种防治棉浮(鹿土)子之有效接触剂,烟草、除虫菊、及豆薯种子,与两种配合式之波尔多液;4—6—50式及2—4—50式,同时在棉田内每半月施用一次,自六月半至七月底共施用四次。比较其消减虫口,减轻受害程度及增加产量诸功能,藉以证明波尔多液之特性。 (二)1000倍豆薯种子粉悬液、600倍除虫菊粉悬液、及100倍烟草水,三者不论在消减虫口,减轻受害程度,以及增加产量各方面,其功能均相若,无显著差异。 (三)4—6—50式波尔多液与2—4—50式波尔多液,对于治虫、减害及增产各功能,亦无显著差异。 (四)豆薯种子粉悬液、除虫菊粉悬液、及烟草水三种接触剂经施用后一天之治虫效力,均显较波尔多液为优,惟至第三天,差异便不显著,三天以后,波尔多液之功效反日见优越。此显示波尔多液之持久特性。 (五)棉浮(鹿土)子之虫口发生愈多,则波尔多液之功效愈著。因其效力持久,所抑制之虫口可还较接触剂为低。 (六)波尔多液减轻棉叶之受害程度,因其药效持久,附属牢固,保护力强,故亦较三种接触剂为优。 (七)施用波尔多液后,结铃数显然增加。其功效亦优于三种接触剂。 (八)施用波尔多液后,每亩皮棉产量亦显著增加。本年结果,施用4—6—50式波尔多液者,产量较对照区增多3.12倍,2—4—50式波尔多液区较对照区增产2.85倍

    This preliminary study of the influence of spikelet pruning on the quality and yield of wheat grains was carried out at Fukien Agricultural College in October 1952 through May 1953. The results are summarized as follows: 1. The number of grains increases in each spikelet as a result of pruning. 2. Size, weight, and protein content of the grain increase both with the difference in variety and the dates of planting. 3. Treated wheat plants ripen earlier. 4. The total yield decreases slightly. This...

    This preliminary study of the influence of spikelet pruning on the quality and yield of wheat grains was carried out at Fukien Agricultural College in October 1952 through May 1953. The results are summarized as follows: 1. The number of grains increases in each spikelet as a result of pruning. 2. Size, weight, and protein content of the grain increase both with the difference in variety and the dates of planting. 3. Treated wheat plants ripen earlier. 4. The total yield decreases slightly. This is probably due to the fact that the gain in weight of grains does not overcome the loss of weight by the removal of some of the spikelets,

    作者等于一九五二年十月至一九五三年五月在本校农场进行小麦花序修整的研究,结果归纳如下: 1.剩佘小穗的结实性,种子肥大性,及蛋白质含量均有提高,但提高的程度因品种和播种期而有所不同。 2.成熟期提早。 3.不同品种不同播种期,对于修整花序有不同的反应,以迟熟种的反应更为显著。 4.产量稍为减低,可能是因为千粒重的增加弥补不了粒数的减少。

    The anhydro ring in a-methyl 2:3-anhydro-4:6-benzylidene-D-allopyranosidehas been opened by the action of sodium benzylate to give 53% yield ofα-methyl 2-benzyl-4:6-benzylidene-D-altropyranoside and 9% of a-methyl 3-benzyl-4:6-benzylidene-D-glucopyranoside.After the removal of the benzy-lidene residue by acid hydrolysis,the position of attachment of the benzylgroup is determined by periodate oxidation.Catalytic hydrogenolysis of thebenzyl group gives the known α-methyl D-altroside and a-methyl D-glucosiderespectively...

    The anhydro ring in a-methyl 2:3-anhydro-4:6-benzylidene-D-allopyranosidehas been opened by the action of sodium benzylate to give 53% yield ofα-methyl 2-benzyl-4:6-benzylidene-D-altropyranoside and 9% of a-methyl 3-benzyl-4:6-benzylidene-D-glucopyranoside.After the removal of the benzy-lidene residue by acid hydrolysis,the position of attachment of the benzylgroup is determined by periodate oxidation.Catalytic hydrogenolysis of thebenzyl group gives the known α-methyl D-altroside and a-methyl D-glucosiderespectively and their constitutions are thus proved.While an ethylene oxide ring in a sugar molecule can be opened by alkaline reagents,such as sodium hydroxide,sodium methoxide,ammonia,etc,the use of sodium benzylate has the advantage that one of the hydroxylgroups is protected after the scission by the benzyl group which can in turnbe removed by catalytic hydrogenation.

    应用苯甲醇钠可以裂解α-甲基2∶3-内醚-4∶6-苯亚甲基-D-同侧醣氧六圜配醣物的醚环,生成53%的α-甲基2-苯甲基-4∶6-苯亚甲基-D-2-异侧醣氧六圜配醣物及9%的α-甲基3-苯甲基-4∶6-苯亚甲基-D-葡萄糖氧六圜配醣物。此两化合物的结构,应用水解除去苯亚甲基及接触氢解除去苯甲基后,证明是已知的α-甲基 D-2-异侧醣氧六圜配醣物,及α-甲基 D-葡萄糖氧六圜配醣物;苯甲基在醣分子中的衔接位置,则应用高碘酸钠氧化测定。

     
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