氮

Experimental result shows that, the fresh yield of eatable part of vegetable increased along with adding the dosage of nitrogenous fertilizer in the four continuous stubbles of the designed field experiment. It also shows that the optimal dosages are 537.4 and 473.88 kg/hm2 for celery planting and cabbage planting, respectively.

结果表明，在试验设计范围内，随着施氮量的增加，四茬蔬菜鲜样可食部分产量随着施氮量的增加而增加，芹菜的最佳施氮量为537.4kg/hm2，白菜的最佳施氮量为473.88kg/hm2。

Time are tested under different kinds of stress for nitrided and un-nitrided specimens made from 35CrMo steel. The testing time ranges from 70 to 80 hours. The following equations are regressed from the tested curves: Un-nitrided specimens:〓 Nitrided specimens:〓 The above equations are consistent with the first stage theory for creep.

为此本文通过实验，测试了35CrMo钢渗氮和未渗氮两种试样在500℃时不同应力情况下的应变随时间的变化曲线，实验时间为70-80小时，将测得的曲线回归出以下方程：未渗氮样品：〓渗氮样品：〓以上方程符合蠕变的第一阶段陈化理论公式。

Adding N, P could improve cucumber root activity, increased the absorptionof N, P and Mg, decreased that of K; Adding N improved the contents of Ca,Fe, Mn and Zn in leaves, and adding P accelerated absorption of cucumberroot to Fe. Adding K decreased the contents of N, P in leaves, but increased K,Fe content, contents of Ca, Mn and Zn decreased at the same time.4. Adding the rates and ratio of N, P, and K increased the activity of SOD incucumber leaves and root. The changes of POD activity were complex, maybeP played the more important role.

增加氮、磷的用量和配比有利于增强黄瓜的根系活力，促进黄瓜对氮、磷的吸收，减少对钾素的吸收，提高叶片镁含量，增氮提高了叶片中钙、铁、锰和锌的含量；增磷促进了植株对铁的吸收；增钾降低叶片中氮、磷含量，增加植株对钾的吸收，提高了叶片中铁的含量，但钙、锰和锌的含量降低。4。

The grain size of sediments has an important role in the early diagenesis of nitrogen.

在氮的早期成岩过程中，粒度也起着非常重要的作用，沉积物的粒度越细，沉积物中有机氮的分解速率越小，即细粒度沉积物中有机氮的分解矿化速率最小，易于富集有机氮。

The photochemical and thermal decomposition of various diphenylamine diazonium salts in ethanol were studied. It was found that, the major products in photochemical decomposition are their corresponding substituted diphenylamino-4-ethyl ethers while their corresponding diphenylamines were obtained as only one product in the case of thermal decomposition.

并研究了二苯胺型重氮盐的光、热分解，结果表明：在醇中，二苯胺型重氮盐的光解主要生成重氮基被乙氧基取代的产物；热解几乎生成唯一的重氮基被氢取代的产物。

The paper discloses a process for diazotization fluorination of aromatic primary amines utilizing sodium nitrite and anhydrous hydrofluoride to produce the corresponding diazonium fluoride which is decomposed, usually by heat, to make the desired fluoroaromatics .

本文通过重氮化工艺路线的改进，在液态氟化氢中进行重氮化和重氮盐的热分解，提高了芳香族氟化物的收率，并且使重氮化反应工艺能应用于工业化生产。

First, the precursor polymer with azobenzene groups on main-chain was obtained by condensation polymerization between 4,4'-dihydroxyazobenzene and N,N-(2-bromoethyl)aniline through Williamson reaction. Then the azo polymer containing azobenzene groups both on main-chain and side-chain was prepared through an azo-coupling reaction between the precursor polymer and the diazonium salt of 4-nitroaniline.

设计并合成了一种新型的主侧链均含偶氮生色团的聚合物，首先通过4，4'-二羟基偶氮苯与N，N-二溴乙基苯胺之间的Williamson反应缩聚得到主链含偶氮苯基团的先驱聚合物，再通过重氮偶合反应得到目标产物，并利用核磁共振、红外光谱、紫外可见光谱、热分析等手段确认了所制备聚合物的结构。

As an innovative technology, biodenitrification had been widely studied and applied at home and abroad,it provides a feasible and forehanded way for the environmental denitrification.

生物脱氮作为一种新兴技术，已经在国内外开展了广泛的研究和应用，为环境领域的脱氮处理提供了一个实用而节能的新途径，因此，集中对生物脱氮技术在废气和废水中的应用进行了介绍，分别介绍了这两个方面的进展，并简单比较了各种技术的优缺点，还探讨了生物脱氮技术的今后发展方向。

Study on single-stage biodenitrification by immobilized cells;2. As an innovative technology, biodenitrification had been widely studied and applied at home and abroad,it provides a feasible and forehanded way for the environmental denitrification.

生物脱氮作为一种新兴技术，已经在国内外开展了广泛的研究和应用，为环境领域的脱氮处理提供了一个实用而节能的新途径，因此，集中对生物脱氮技术在废气和废水中的应用进行了介绍，分别介绍了这两个方面的进展，并简单比较了各种技术的优缺点，还探讨了生物脱氮技术的今后发展方向。

Both of Eichharnia crassipes and Hosta ventricosa can grow normally in a single nitrogenand phosphorus stress condition, The higher the concentration of nitrogen and phosphorus in waterthe higher the chlorophyll content and dry matter content in plants, it means the growth of plants isgood, This proves that Eichhamia crassipes and Hosta ventricosa has a very strong ability to adaptin a single nitrogen and phosphorus pollution water, they can be used for repairing a singlenitrogen and phosphorus pollution water.

在单氮和单磷胁迫条件下植物都能够正常生长，并且水体中氮、磷浓度越高凤眼莲和紫萼玉簪体内的叶绿素含量及干物质含量就越高，说明两种植物的生长状况就越好，这一点证明两种植物对氮、磷污染的适应能力都很强，可以用于修复单氮和单磷污染水体。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。