查询词典 nitrogen cycle

The theoretical analysis of the work cycle is made for the pressed air engine and liquid nitrogen engine.

从理论分析的角度，对压缩空气发动机和液氮发动机的工作循环进行了分析讨论，采用不同概念计算了两者的可用能，并着重分析了膨胀初始压力和温度对输出功的影响，还探讨了液氮发动机工作循环的优化途径。

There is an oxygen-nitrogen-inert GAS atmosphere of suitable pressure and a moderate weather cycle.

这里有压力适当的氧、氮、惰性气体混合大气层和温和的气候循环。

S a main source and sink of nitrogen from lake wetland ecosystem, lake sediment has an important significance for biogeochemical cycle of nitrogen.

bstract 湖泊底泥作为湖泊湿地生态系统中氮素的主要源与汇，对氮素的生物地球化学循环具有重要意义。

The influences of heat exchanger and engine on system efficiency are distinguished. The thesis also analysis the efficiency of the compound cycle of liquid nitrogen engine operating on open Rankin cycle together with the liquid nitrogen refrigeration cycle and economy in detail.

首次采用变质量系统热力学原理探讨了通过对进气温度与缸内残余质量温度的控制有助于实现准等温膨胀的可行性；首次采用有限时间热力学对具有压降不可逆液氮发动机开式朗肯循环进行了工作过程分析，研究了漏气和压降对液氮发动机效率和功率的影响关系。

It consists of nitrogen Brayton cycle, nature gas direct expansion and ammoniawater Rankine cycle.

该流程是氮气Brayton循环、天然气直接膨胀和氨水混合物Rankine循环的联合。

The broader issue, therefore, is the extent to which humanity has hijacked the "nitrogen cycle", as the passage of that gas into and out of the atmosphere is known, for its own use.

因此更为广泛的问题是人类"劫持""氮循环"的程度，氮循环是氮气自身使用过程中进出大气的过程。

The relationship between soil microbial number and organic matter, total N, available N, and available P of soil samples, and the ecological effect of soil microbial physiological community participating nitrogen cycle in this area were also discussed.

同时讨论了土壤微生物数量与土壤有机质、全N、有效N和速效P的相关性及微生物生理群在该场区氮循环中的生态作用。

In the new process, middlelowtemperature waste heat is used as heat source and LNG cold energy is divided into the lowtemperature latent cold energy and the hightemperature sensible cold heat. Nitrogen Brayton cycle recovers lowtemperature latent LNG cold energy, while the ammoniawater Rankine cycle recovers the hightemperature sensible LNG cold heat, whereby the graded use of energy can be realized. The exergy efficiency of LNG cold energy utilization can be effectively improved.

流程中以中低温余热为热源，并将LNG冷量分为低温级的潜热冷量和高温级的显热冷量两级，氮气Brayton循环回收LNG低温级的潜热冷量，氨水混合物Rankine循环回收LNG高温级的显热冷量，实现了能量的梯级利用，有效提高了LNG冷能利用的火用效率。

These nitrogen cycle bacteria include ammonifying bacteria, denitrifying bacteria, nitrobacteria and nitroasobacteria, determined with MPN method.

结果表明，反硝化细菌的最大可能数，在水生高等植物群落内水体中较敞水区湖水高2－5个数量级，差异极显著（P＜0.01），漂浮植物群落内水体的反硝化细菌MPN值较沉水和浮叶植物群落内水体高2－3个数量级，差异极显著（P＜0.01）；硝化细菌MPN值，敞水区湖水高于凤眼莲、水花生群落内水体，差异显著

Nitrite reductases are the key enzymes in the denitrification pathway of the nitrogen cycle.

亚硝酸还原酶是反硝化过程中的关键作用酶，它使NO2？转变成NO，减轻了水体中的氮污染。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。