查询词典 gross yield

Grain yield per hectare is the most important factor in the method of the gray system analysis. There was significant correlation between effective irrigated area, the amount of fertilizer applied, mechanical power and the grain yield. The area of grain and the population of agriculture are factors that affect grain production. The correlation coefficient of natural resources and grain production changes unstably.

单产与粮食产量始终保持很高的关联度；有效灌溉面积、实际机耕面积、化肥施用量、农村用电量和农机总动力等农业投入对粮食产量提高影响重大；耕地面积和劳动力对粮食产量具有一定的制约；自然条件与粮食产量的关联度剧烈变动。

A screening and cultivation method for Bacillus thuringiensis of high-yield high temperature resisting protease includes the following steps: high-yield high temperature resisting protease Bacillus thuringiensis Bt140 is obtained through adopting casein substrate agar to identify flat primary screen and fermenting enzyme activity measuring secondary screening; Plackett-Burman design and response surface analytical method are adopted to obtain optimal fermentation zymogenic formula and fermentation condition for Bt140 quickly; finally, shaking fermentation level reaches to 918.56U/mL.

一种高产耐高温蛋白酶的苏云金芽孢杆菌筛选及培养方法，采用酪蛋白底物琼脂鉴定平板初筛与发酵酶活测定复筛的方法获得高产耐高温蛋白酶苏云金芽孢杆菌Bt140；采用Plackett-Burman设计与响应面分析法快速获得了Bt140最佳的发酵产酶配方与发酵条件，最终摇瓶发酵水平可达918.56U/mL。

For a higher yield, the multibranch well bore should be perpendicular to the direction of maximum principal permeability, b. for a given coalbed methane reservoir, there is an optimal interspace, by which a bigger control area and the interaction among the branches can be obtained, and c. with the extension of the branch, gas yield becomes obviously higher, while the branch length should be an appropriate value on account of the influence of coal bed boundary and wellbore pressure drop. The research results have guiding significance for well pattern optimization and efficient development of coalbed methane gas.

结果发现：为了获得较高的产能，多分支井的井筒应垂直于最大主渗透率方向；对于给定的煤层气藏，存在一个最优的分支间距，既能保证较大的控制面积，又能保证分支间的互相影响；随着分支长度的增高，产气量也显著增大，但是考虑到煤层边界和井筒压降的影响，分支长度也应该有一个比较合理的值。

While other reaction conditions were setted, viscosity and yield of the product P were determined by Ubbelohde viscosity meter in different temperature;By parity of reasoning,viscosity and yield of the product P were determined in different initiator concentration、monomer concentration and monomer ratio.

固定其它反应条件不变，用乌氏粘度计测定了在不同引发剂浓度下产物P的特性黏度及产率；以此类推，测定了在不同单体浓度、单体配比条件下产物P的特性黏度及产率。

To the product yield is mainly studied in the brominating process, and the best synthesizing process conditions is obtained; the effect of the selection, quantity of the solvent, the reaction temperature, reaction time, and the catalyzer to the product yield is researched in the process of ketalization and the relative preferable process conditions has been got.

在脱溴反应中，主要研究了溶剂的用量、溶剂配比、物料配比、反应时间和反应温度等对目标产物得率的影响；在选择性溴化反应中，主要研究了溶剂和溴化剂的选择、物料配比、溶剂的用量等参数对产物质量和得率的影响，最终得到了合成的最佳工艺条件；在缩酮化反应中，主要研究了溶剂的选择、溶剂的用量、反应温度、反应时间和催化剂的选择等参数对产物得率的影响，并得到合成的较佳工艺条件。

Yield of nitrated porphyrins vibrated fiercely with different concentrations of nitric acid. It was found that nitration with 80% nitric acid (w/w, d = 1.45) could afford over 90% yield of mono nitrated TPP.

不同浓度的硝酸对硝化产物收率有较大的影响，论文首次以80%的硝酸为硝化试剂，适当条件下获得了收率超过90%的单硝化产物。

HNIW was obtained by the nitrolysis of TADNSIW and TAIW using N_2O_5/HNO_3 as nitrating agent. Several effects on the yield, purity and crystalline form of product were analyzed. In the best conditions, the yield of HNIW was 87.2% and 89.2%, the purity was 96% and 99%, they were all mixtures ofα-HNIW andγ-HNIW.

分析了各种因素对产物收率、纯度及晶型的影响，在最优条件下，HNIW的收率分别为87.2％和89.2％，纯度分别为96％和99％，产物均为α-HNIW和γ-HNIW的混合物。

The residual stress σ〓 in the weld center is always as high as the yield strength σ〓 for both the strength undermatching and overmatching when the yield strengthσ〓 is lower.

母材屈服强度σ〓较低时，如低碳钢，低强匹配（焊缝屈服强度σ〓＜母材屈服强度σ〓）和高强匹配时焊缝中心纵向残余应力σ〓均能达到焊缝屈服强度σ〓。

High yield strain and low yield strain were tested and showed the biological characteristics diversity: the color of hydrolyzed grease in plate and determining the dissociated acid of fermentation fluid straightly relate to the producing of spinosyn, then establishment of the rapid screening pattern for spinosyn overproducing strain

研究产量差异大的高产菌株和低产菌株的各种生物学特性，发现通过油脂水解平板的颜色以及发酵液的酸价，与菌株的发酵单位有直接相关性，从而建立了快速筛选模型。

Tiller is one of three major determinant factors of rice yield, an important yield trait, and a key parameter in ideal rice pattering.

分蘖是产量构成因子的三要素之一，是重要的农艺性状，也是理想株型构建的重要参数。

This paper designs the communication system of radio telescope FAST.

针对500m口径球面射电望远镜FAST分布式控制系统的特点完成了其通信系统的设计。

Political sheep's step-by-step a large number of fossils unearthed in the county soil Ma Ali after rural village in the middle of sallow pelitic siltstone.

步氏和政羊化石大量出土于广河县阿力麻土乡后山村，产于灰黄色泥质粉砂岩中。