硝酸

The results showed that: the influence of the aquaculture process on aquaculture water determined by type of aquaculture; the influence of aquaculture process on the water temperature, salinity and pH value were not wide.the descent of pH value was related to feed coefficients ; the dissolve oxygen of water in outfall was lower than the water in infall,but the concentration still maintained at the saturation level, is mainly affected by density of aquaculture ,rate of feed and artificial measures of increasing oxygen ;the major form of inorganic nitrogen was nitrate-N;the concentration of inorganic nitrogen and the organic matter tended to increase ,but the ammonium to decline ,this was relation with density of aquaculture ,rate of feed and variation of the different inorganic nitrogen form ; concentration of phosphate-P was low in outfall of pond , related with phosphate-P precipitating, as flowing water speed slowly in outfall;This phenomenon that the total number of bacteria and coli form group of water in outfall was lower than the water in infall , this caused by measures of sterilization and disinfection .

结果表明：养殖过程对水体影响与养殖类型有关。养殖过程对水体的水温、盐度和pH影响不大； pH下降与饲料系数高有关；溶解氧含量排水口比进水口低，但仍维持在饱和状态，与养殖密度、投饵率和人工增氧有关。硝酸氮是无机氮的主要存在形式，无机氮和有机物含量有升高趋势，氨氮有下降的趋势，与养殖密度，投饵率和各种无机氮之间的相互转换有关。活性磷酸盐含量在排水口含量下降，与排水口流水速度慢，磷酸盐沉淀有关。生物指标细菌总数和大肠杆菌总数在排水口比进水口低现象普遍存在，这与养殖场杀菌消毒等措施有关。

Intramolecular hydrogen bond is also the reason for the lower boiling point of nitric acid.

分子内氢键也是硝酸沸点较低的原因。

There are many methods to produce iron oxide red in industry.

目前我国工业合成氧化铁红的方法有很多，其中最常见的是硝酸湿法工艺。

METHODS: The models of abdominal aorta transplantation were made with micro-surgery in rats. The recipients were divided into three groups: allograft control group, atorvastatin-treated group and isograft control group. Vascular intimal thickness in all of the groups was observed by histological examination. The expression of proliferation cell nuclear antigenl and α-smooth muscle actin were determined by immunohistochemistry. The content of nitric oxide was measured by nitrate reductase chromatometry.

建立大鼠腹主动脉移植慢性排斥反应模型，分为3组：异系移植对照组、异系移植治疗组和同系移植组，60d后对移植动脉行病理组织学检测，观察移植动脉内膜增生程度；并行免疫组织化学染色，检测移植动脉增殖细胞核抗原和平滑肌肌动蛋白的表达情况，行硝酸还原酶比色法测定移植动脉组织NO的含量。

The field trail for reducing nitrate content in vegetable was conducted on granite laterite in Hainan.

蔬菜生产过程中，盲目的施用氮肥，肥料施用中养分不平衡，生长的环境因子不良，均会造成硝酸含量过高。

The spherical heat transfer models of three primary explosive particles lead styphnate, nickel hydrazine azide NHA and nickel hydrazine nitrate (NHN were calculated by Fourier analysis and numerical simulation.

对斯蒂芬酸铅、叠氮肼镍和硝酸肼镍进行单颗粒球形传热模型的Fourier分析和数值模拟，并对三种药剂进行了SCB点火实验。

When the propellant was lead styphnate and nickel hydrazine nitrate, their properties ...

研究了装药分别为硝酸肼镍和斯蒂酚酸铅的微推进器的推进性能。

When thepropellant was lead styphnate and nickel hydrazine nitrate, their propertiesof ignition and thrust were investigate.

研究了装药分别为硝酸肼镍和斯蒂酚酸铅的微推进器的推进性能。

In the experiment, the electrolyte was lead nitrate aqueous solution containing zirconium oxide chloride and titanium chloride solution. Stainless steel plate was employed as both cathode and substrate.

实验中所用的电解液是混有氧氯化锆和三氯化钛的硝酸铅溶液，采用不锈钢片作为阴极和基底。

When the propellant was lead styphnate and nickel hydrazine nitrate , their properties of ignition and thrust were investigated under different chamber diameter and different proportion of themixed propellant.

研究了史蒂酚酸铅和硝酸肼镍在不同药室直径和药剂配比下的点火和推进性能，并且计算了推力器参数对推力性能的影响。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。