硝酸

By treating this precipitate with nitrous acid followed by a recrystallization process, copper nitrate was recovered in 82.32% yield.

该沉淀经硝酸溶解和浓缩结晶可以得到硝酸铜，其回收率为82.32%。

Several transient compounds were synthesized by the homo- and heterogeneous reactions of reactive halogen compounds, In-situ ultraviolet photoelectron spectroscopy and photoionization mass spectroscopy as well as theoretical calculations were used to study their molecular structures, stability and molecular orbital properties, their electronic structures and geometric structures were obtained for the first time; Simultaneously, the electronic structure and thermal dissociation of acetyl peroxynitrate and trifluoroacetyl peroxynitrate which have great importance in the atmospheric chemistry were studied; The substituent effects of series of halopyridines and halothiophenes were studied by the ultraviolet photoelectron spectroscopy method for the first time. The atmospheric chemical reaction between peroxyacetyl radicals with IO radicals as well as the dissociation of the most stable isomer of CH3COIO3 were calculated by density functional theory, it was found that the CH3COOIO2 isomer may be act as a new reservoir of inorganic iodine in the stratosphere.

通过活性卤素的系列均相与非均相化学反应合成了几种瞬态物种，采用原位紫外光电子能谱和光电离质谱结合量子化学理论计算对化合物的分子结构、稳定性以及分子轨道特性进行了研究，首次获得了这些物种的电子结构和几何结构的信息；同时研究了大气中有重要作用的乙酰过氧硝酸酯和三氟乙酰过氧硝酸酯的电子结构性质及热解过程；采用紫外光电子能谱手段首次研究了系列卤代吡啶和噻吩的取代基效应；通过量子化学理论计算研究了乙酰基过氧自由基与IO自由基的大气化学反应及其最稳定异构体CH3COOIO2的解离，发现该物种可能是无机碘化合物在平流层中的储库物种。

It is more practical to obtain one uranium product and one uraniumplutonium mixture product through partial separation of uranium and plutonium.

系统分析了用稀硝酸反萃分离萃入30％TBP／煤油中的铀钚的工艺，分析了各操作变量的影响，结果表明用稀硝酸反萃分离铀钚是可能的，铀钚部分分离得到有机相铀产品和水相铀钚混合物产品的工艺较为现实可行。

PETN is a typical nitric acid ester of high explosive with good explosion property. It is chosen as the base of polymer bonded explosive.

PETN（季戊四醇四硝酸酯，又名太安）是爆炸性能优良的硝酸酯类高能炸药的典型，该研究将其选作高聚物粘结炸药中的墓炸药。

Effects of the different accelerants(La and Ce nitrate,Na nitrate and Na molybdate) on phosphatization were discussed.

提出在表面生成磷化膜以提高不锈钢的耐磨与耐蚀性能的工艺方法，讨论了各种促进剂(亚硝酸钠、钼酸钠、硝酸铈和硝酸镧)对磷化膜形成的影响，探讨了稀土对磷化的影响机理。

Study on Phosphatization and Passivation Two in One Treatment Process;2. Effects of the different accelerants(La and Ce nitrate,Na nitrate and Na molybdate) on phosphatization were discussed.

提出在表面生成磷化膜以提高不锈钢的耐磨与耐蚀性能的工艺方法，讨论了各种促进剂(亚硝酸钠、钼酸钠、硝酸铈和硝酸镧)对磷化膜形成的影响，探讨了稀土对磷化的影响机理。

OBJECTIVE:To determine pilocarpine nitrate and its degradation products by HPLC,study the stability of pilocarpine nitrate eye-drops.

肖仰目的：建立以高效液相色谱法测定硝酸毛果芸香碱滴眼液中硝酸毛果芸香碱的含量及其降解产物，同时进行了其稳定性考察。

The method is based on the oxidation-reduction reaction between potassium iodide and nitrite.

建立了碘化钾与亚硝酸根氧化还原反应生成游离碘使异硫氰酸荧光素荧光猝灭测定痕量亚硝酸根的新方法。

Based on the nitrite catalyzed oxidation of pyrocatechol violet by potassium bromate, a new catalytic spectrophotometric method for determination of trace nitrite has been developed.

基于在磷酸溶液中，亚硝酸根对溴酸钾氧化邻苯二酚紫的褪色反应具有催化作用，建立了催化光度法测定微量亚硝酸根的新方法。

The low-grade phosphate ore s with high impurities of sesquioxide were digested in phosphoric acid and nitric acid.

采用正交实验，研究了高倍半氧化物含量的中低品位磷矿在磷酸与硝酸混酸中的酸解行为，并确定了实验室最佳工艺条件：反应温度65℃，液固比14∶1，磷酸浓度(P2O5)20%，硝酸浓度9。

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。