查询词典 yield spread

The results shown that there will be great potential capacity to increase grain output in production, and the grain yield are positive related with the amount of fertilizer markedly as a whole, but there have been imbalance and inconsequence in using of fertilizer. It is essentially important to improve fertilizer use efficiency for save resources as well as increase yield. To increase grain output should to arrange fertilizer by planning as a whole rationally rather than to increase its amount.

结果表明，藁城市粮食生产还有很大的增产潜力，总体上粮食产量与化肥的投入仍然呈显著正相关关系，但是，目前实际生产中化肥施用量存在极其严重的不平衡和不合理现象，所以增施化肥已不再是增产的主要措施，而合理统筹、提高化肥的利用率至关重要，是节能增效的重要措施。

A total of 52 QTLs for 8 yield and yield component traits were detected in BC3F3 population and introgression lines.

在BC_3F_3群体和渗入系群体中共检测到52个控制8个农艺性状的QTL。

Results show that 4-oxo-β-ionone is the major product with yield of 53.5% under the conditions as follows: reaction temperature 45℃, reaction time 24 h, the molar ratio of n: n(NaClO3): n 20: 100: 3, and pH value of solution in 1-3; on the other hand, 5,6-epoxy-β-ionone is major product with yield of 25.4% when reaction temperature is 40℃, reaction time is 24 h, the molar ratio of n: n(NaClO3): n is 20: 120: 5, and pH values of solution is 3. The excessive β-ionone can be recovered by vacuum distillation for reusing again. 4-oxo-β-ionone and 5,6-epoxy-3-ionone were purified by recrystallization and silica gel column chromatograph respectively with the purity over 98%.

研究结果表明：氯酸钠氧化β-紫罗兰酮的反应主要生成4-氧代－β-紫罗兰酮和5，6-环氧－β-紫罗兰酮，经重结晶和硅胶柱层析分离，纯度高于98%；4-氧代－β-紫罗兰酮的有利合成条件是反应温度为45℃，反应时间为24h，溶液的pH值为1~3，反应物配比n：n(NaClO3)：n为20：100：3，最佳收率为53.5%；5，6-环氧－β-紫罗兰酮有利的合成条件是反应温度为40℃，反应时间为24h，溶液的pH值为3，反应物配比n：n(NaClO3)：n为20：120：5，其收率为25.4%；未反应的β-紫罗兰酮经减压蒸馏回收后可重复使用。

In order to analyze rheological property and establish constitutive model of Q_2 loess, a series of uniaxial creep experiments on different water content are done .The creep test curves and stress-strain isochronism curves are drawed with the result of experiments and conclusions are reached from the curves. The creep performance of Q_2 loess is different under the different stress level. In the different time the stress-strain isochronism curve has obvious inflection point namely yield stress and the yield stress reduces along with the increase of water content, which can be described by exponential function.

为了分析黄土的流变特性和建立相应的本构模型，本文首先根据对不同含水量的Q_2黄土进行的一系列单轴应力条件的室内蠕变试验结果，分析总结了Q_2黄土蠕变特征和应力—应变等时曲线特征，得出Q_2黄土在不同的应力水平下蠕变变形表现形式不同；在不同的时刻应力—应变等时曲线存在有较明显的拐点，拐点所对应的应力即为屈服应力，屈服应力随着含水量的增大而呈指数形式降低；Q_2黄土可近似看成一种线性粘弹塑性体。

The selected prepared catalyst for isomerization of light oilis used under the reaction conditions of 260°C, 2.0MPa, WHSV=1.0h-1 , H2/Hydrocarbon molarration 4.0, n-pentane conversion rate is 62.17%,isopentane yield is 57.01%(isomerization rate is58.00%), isopentane selectivity is 91.60%, liquid product yield is 94.84%.

在 T=260°C，P= 2.0MPa ，WHSV= 1.0h-1 ，H/C5= 4.0 时，正戊烷转化率为 62.17%，异戊烷收率为 57.01%(产率为58.00%)，选择性为 91.60%，液体产物收率为 94.84%。

For the enzyme extraction, with the ratio of enzyme/giant knotweed 1:500 at 50℃ for 90 min, the yield of resveratrol is two times more than that extracted by ethanol. For the microwave extraction with the ethanol content of 80%, the liquid ratio of 1:20, extracting by microwave for 60s at 510W, the yield of resveratrol is three times more than extracted by ethanol with enzymation 30 min by microwave for 10 s at 510 W.

酶法辅助提取白藜芦醇的适宜提取条件为：酶解温度为50℃、pH值为5.0、纤维素酶与虎杖粗粉质量配比为1：500、酶解时间为90 min，比传统乙醇提取法提取收率提高2倍；微波辅助醇提白藜芦醇的适宜提取条件为：以体积分数为80%的乙醇溶液为提取剂，料液质量比为1：20，在510 W功率下微波1.0 min，比传统乙醇提取法提取收率提高近3倍；利用酶微波结合提取白藜芦醇，酶解30 min， 510 W功率下微波10 s，提取收率提高3倍，缩短了提取时间，降低了生产成本。

The results showed that, melting point of high yield lactide made in the lab reached 127℃ after three times of recrystallization, and the yield of lactide reached 57.2%.

结果表明：自制高收率丙交酯经过3次重结晶后，熔点可达到127℃，熔程在1℃以内，总产率为57.2%。

The gene substitution model analysis showed thatsubstitution of B for C allele at αs1-Casein locus had a significant(p＜0.05)effect on305-day milk yield,but not for milk fat percent;substitution of A1at β-Casein locus had ainfluence on 305-day milk yield,fat and protein percent;substitution of A at κ-Casein andβ-Lactoglobulin loci had no significant effect on all production performance.

基因替代模型的分析表明，αs1-CN位点B基因对C的替代显著影响305天产奶量，对乳脂率无显著影响，β-CN A1基因的替代对305天产奶量乳脂率和乳蛋率均有显著影响作用，κ-CN和β-LG位点A基因的替代对生产性能均无显著效应。

By means of researching the perpendicular interpenetration of water had the effect on rice turn green, tillering and yield, it proposed that perfect drainage works and facilities, cultivated land deeply at regular intervals, improve soil permeability can lay a strong foundation for high yield.

通过研究水的垂直渗透对水稻返青、水稻分蘖、水稻产量的影响，提出通过完善排水工程、设施，定期深耕田地，改善土壤渗透性，为水稻高产奠定基础。

A experiment was conducted to study the effect of cotton red leaf blight on yield characters and fiber quality of cotton by measuring some yield and fiber characters from plants of Zhongmian 41 with different disease degrees in field and room.

为了明确红叶茎枯病对棉花产量性状及纤维品质的影响，以中棉41为材料，采用田间调查和室内分析相结合的方法，对产量结构和纤维品质相关性状进行了测定和分析。

You'll be in trouble it you don't watch out .

如果你不注意，你会有麻烦的。

Shaped like a biconvex lens.Of, relating to, or having the form of a hyperbola.

双曲线的属于双曲线的，与之有关的，或有双曲线形状的