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yield up
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     The optimal conditions obtained by the orthogonal design experiment for the esterification reaction with the yield up to 62% is that reaction time 55 min,reaction temperature 70℃,catalyst amount 110 g/L and reactants molar ratio of ethanol to acetic acid 1.5∶1.
     通过正交实验得到优化反应条件:反应时间为55 min,反应温度为70℃,催化剂用量为110 g/L,醇与酸摩尔比为1.5∶1,乙酸乙酯收率可达62%。
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     The results indi cate that the presence of vapor is favorable for catalyst to increase the ethylene selectivity . Ethylene in yield up to 52% is obtained under conditions of: V (C 2H 6)∶ V (O 2)∶ V (H 2O, g)= 1∶0 65∶3 8, GHSV=1600 h -1 , 740 ℃ with 10 mL catalyst.
     在催化剂装量 10 m L,V( C2 H6)∶ V( O2 )∶V( H2 O) =1∶ 0 .65∶ 3.8,GHSV=160 0 h-1,74 0℃时 ,乙烯收率仍可以稳定在 52 %以上 .
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     The optimum conditions are molar ratio of benzaldehyde to 1,2propanediol was 1:1.5, the quantity of catalyst was equal to 0.3% feed stock, and the reaction time was 1.0 h. TiSiW12O40/TiO2 was an excellent catalyst to synthesize benzaldehyde 1,2propanediol acetal with a optimal yield up to 90.0%. 
     实验表明:TiSiW12O40/TiO2是合成苯甲醛1,2-丙二醇缩醛的良好催化剂,在苯甲醛与1,2-丙二醇的摩尔比为1:1.5,催化剂用量为反应物料总质量的0.3%,环己烷为带水剂,反应时间1.0h的优化条件下,苯甲醛1,2-丙二醇缩醛的收率可达90.0%.
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     Results indicated that the purity is 94.67% with the yield up to 68%.
     由高效液相法测得纯度为94.67%,收率达到68%。
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     Adipic acid in yield up to 75 0% was obtained in 6 h, in the presence of 8 hydroxyquinoline.
     8 羟基喹啉作助剂时 ,己二酸的收率最高 ,反应 6h ,己二酸的收率可达 75 0 % ;
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  “yield up”译为未确定词的双语例句
     In such cases, the SDO yield up to 10.6±2.2% was achieved.
     通过测量SDO 的自发辐射光谱得到的SDO 产率的最大值为10.6±2.2%。
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     The optimal conditions was obtained by orthogonal experiment as follows: n(NaNO 2)∶n(6-APA)=2∶1, m(PEG-400)∶m(6-APA)=0.08∶1, n(Br 2)∶n(6-APA)=2.0∶1, reaction temperature 8~12 ℃, reaction time 4 h with the yield up to 95% and purity 97%.
     通过正交实验得到最佳反应条件为 :n(NaNO2 )∶n(6 APA) =2∶1; m(PEG 4 0 0 )∶m(6 APA) =0 .0 8∶1;
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     This compound efficiently catalyzed the direct asymmetric aldol reaction with the yield up to 90.0% and enanti- omeric excess up to 89.5%.
     该化合物对映选择性催化直接羟醛反应,产率最高达到90.0%,对映体过量最高达89.5%.
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     Fresh fruit yield were 14 617.5~16 045.5 kg·ha-1,dry kernel yield up to 6 745.5~7 168.5 kg·ha-1.Amylopectin content 93%~94.4%,soluble sugar 2.19%~2.62%.
     鲜果穗产量每公顷达14617.5~16045.5kg,干子粒产量每公顷达6745.5~7168.5kg,支链淀粉含量达93.0%~94.4%,可溶性糖含量为2.19%~2.62%。
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     Experimental results indicated that the optimum conditions of esterificationreaction are as follows: the mole ratio of oleic acid, n-butyl alcohol and p-toluene sulfonic acid 1∶2∶0.15, the reaction time 70 minand the yield up to 93.92%.
     实验结果表明,酯化反应的优化条件为油酸、正丁醇、对甲苯磺酸摩尔比为1:2:0.15,反应时间70min,产率可达93.92%。
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     The yield was up to 86.4%.
     收率 86.4 %。
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     Its yield is up to 46.7%.
     五步总收率达到46.7%.
短句来源
     10 yield.
     结果表明,复合肥不同施用量对油研10号的产量产生显著影响。
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     Its yield is higher by c.
     使用C.
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     Stripe it up
     条纹运动
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  yield up
The RNA-1 components of all three viruses were translated to yield polyproteins of Mr 250k, which were autocatalytically processed to yield up to five cleavage products.
      
Unsaturated 1-pyrazoline3 obtained from diazocyclopropane and norbornadiene decomposes at 330-370°C with elimination of cyclopentadiene to give 3(5)-vinylpyrazole in a yield up to 75%.
      
Salts of 2-halosubstituted 1,3-diketones form more highly enolized cyclic 1,3-diketones - 1,3-cyclohexanedione and dimedone under analogous conditions, with a yield up to 90%.
      
In the presence of a mediator (sodium iodide) acetylacetone dimerizes with the formation of 3,4-diacetylhexane-2,5-dione, with a yield up to 90%.
      
The formation of a certain conformation of the DHDP chain produced by the central atom of the metal complex-former permits the asymmetric synthesis of N-acetylphenylalanylmethionine with the optical yield up to 40%.
      
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The Lycium fruit fly is a serious pest to the Lycium tree.The fruit of which is usedas a famous Chinese medicine produced in Ningsha,China.The larva of the fly attacks thefruit of the Lycium tree,causing a loss to the annual yield up to 22-55%.The morphological characteristics of different stages of the fly are described in this paperand studies on its life history,especially in connection with its hibernation habit and themethod of control were conducted in Ningsha during the years 1959-1962.Hibernating...

The Lycium fruit fly is a serious pest to the Lycium tree.The fruit of which is usedas a famous Chinese medicine produced in Ningsha,China.The larva of the fly attacks thefruit of the Lycium tree,causing a loss to the annual yield up to 22-55%.The morphological characteristics of different stages of the fly are described in this paperand studies on its life history,especially in connection with its hibernation habit and themethod of control were conducted in Ningsha during the years 1959-1962.Hibernating as pupa in the soil,the fruit fly breeds three generations a year.The firstgeneration larva prevails simultaneusly with the appearance of the fruit of the tree in Juneand July,thus causing serious damages.Eggs are deposited singly inside the fruit,and thelarva lives there on its juice.Coming out through the base of the fruit,the matured larvadrops to the ground and pupates in the soil.According to the result of a series of experiments of soil treatment with several kinds ofinsecticide conducted in the laboratory as well as in the field,the treatment with 6% γBHC6 catties per mow shows better result,aldrin comes second,and DDT and 1068 with com-paratively lower efficiency.

(1)枸杞实蝇 Neoceratitis asiatica (Becker)属双翅目实蝇科(Trypetidae),分布于我国的宁夏、青海和新疆。其幼虫专以枸祀的果实为食。(木巳)果被害率一般为22—55%。(2)实蝇一年发生三代。第一代幼虫发生在结果时期,为害最重,虫口密度最高;第二代次之;第三代最少。以蛹在土内越冬,分布在土下1—3寸处。卵产于果内嫩种子上,每果1卵,幼虫生活在果内,成熟幼虫由果柄附近钻出落地入土化蛹。成虫寿命,雌虫平均14天,雄虫5.5天。卵及幼虫21.6天,蛹18.3天,一个世代约需46.4天。(3)根据三年来防治试验:在越冬蛹羽化以前(约5月上旬),用6%r666粉剂每亩6斤土壤处理,防治初羽化的成虫有效。土面撒布666粉也有一定的效果。摘除蛆果深埋,并撒布6%666粉,亦有实际推广意义。

The high bitumen yield up to 80% of kerogen by super-critical fluid extraction of oil shale, the good agreement of H/C and infrared spectra between the kerogen, bitumen and demineralized extracted residue, suggest that the major part of kerogen is a kind of polymer. Under the experimental conditions of SCFE, since kerogen was swollen, depolymerized and extracted immediately by super-critical fluid (toluene) only with little secondary decomposition, the carbon skeleton of the bitumen remains nearly the...

The high bitumen yield up to 80% of kerogen by super-critical fluid extraction of oil shale, the good agreement of H/C and infrared spectra between the kerogen, bitumen and demineralized extracted residue, suggest that the major part of kerogen is a kind of polymer. Under the experimental conditions of SCFE, since kerogen was swollen, depolymerized and extracted immediately by super-critical fluid (toluene) only with little secondary decomposition, the carbon skeleton of the bitumen remains nearly the same as its parent .According to the 1H nmr spectrum, ultimate analyses and average molecular weight, the structural parameters of bitumen were calculated.Referring to the data, the carbon constitutional fraction of Maoming oil shale kerogen was estimated as follows. Aromatic C, 0.25-0.30; naphthenic 0,0.20-0.30 and paraffinic C, 0.40-0.45. For Fushun oil shale kerogen, the result is quite similar but a little higher in paraffinic C and lower in naphthenic. The aromatic rings are mainly cata-condensed and linked with naphthenic rings as in the te-tralin-type structures.The structural unit of kerogen may be described by the elution-chromatographical constituents, their molecular ratio and molecular weights, then the structural unit weight of the Maoming kerogen had been estimated about 4500. Its chemical formula may be written as C302H440O23N6S2.

茂名和抚顺油页岩在本文第一部分所列条件下的各次抽出物的元素分析、红外光谱分析、冲洗色谱组成分析和~1H核磁共振波谱分析,其结果相接近。可以认为其油母质主要部分是一种聚合物。茂名油页岩油母质碳骨架结构族组成的近似值为:芳碳率0.25—0.30,环烷碳率0.20—0.30,链烷碳率0.40—0.45。估算茂名油母质结构单元的分子量约为4500,推定其化学式为C_(302)H_(440)O_(23)N_6S_2。

Two new azoxybisbenzocrown ethers were synthesized. Preparative method of azo-xybisbenzo-15-crown-5 has been improved with the yield up to 65.3%. It was obser-ved that the degree of dissociation of electron-transfer agent plays an important rolein product yield. The results were interpreted in terms of solvent polarity.Photo-andthermo-isomerization of azoxybisbenzocrown ethers have been studied preliminarily.

合成了两种新的氧化偶氮双苯并冠醚,改进了氧化偶氮双苯并15-冠-5的制备方法,使其收率提高到65.3%。工作中观察到,电子转移剂的离解程度对产物收率起重要作用,井以溶剂的极性给予解释。对这类双冠醚的光和热异构化做了初步探讨。

 
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