硝酸

A modified γ-Al〓O〓 was prepared by a special precipitation method with aluminum nitrate solution containing a certain amounts of orthosilicic acid and ammonia aqueous solution. Compared with commercial γ-Al〓O〓, the modified γ-Al〓O〓 was an effecient catalyst for dehydration of tetrahydrofurfuryl alcohol to dihydropyran. The results revealed that the strong acid sites on the surface of the catalyst may play a crucial role in this reaction.

并以硝酸铝和氨水为原料，用沉淀法制备出一种高比表面和拥有较多强酸中心的γ-Al〓O〓，它在四氢糠醇开环脱水制备二氢吡喃的反应中有优良的催化活性，通过比较此γ-Al〓O〓和普通商业γ-Al〓O〓的Py-TPD图，发现强酸中心在制备二氢吡喃的反应中可能具有关键的作用。

Both materials can't resist the corrosion of strong oxidable acid.

烯硫酸、硝酸及浓度较大的盐酸、磷酸、氢氟酸、甲酸、乙酸）、氨和胺及各种碱、盐溶液都有两好的耐蚀性、两种材料都不耐强氧化性酸的腐蚀。

MPH plastic magnetic pump complies with JB/T7742-1995Standard for Small Magnetic Transmission Centrifugal Pump. Its flow-through parts adopt PPS with corrosion resistance to most acid, alkali and salt (except oxidable acid like strong sul-furic acid, nitric acid and aqua regia). Its performance is close to the chemical performance of F4, which can resist to most organic solvents under 100℃, especially to the mixture of gas and carbinol. Thus it is an ideal pump for acid and alkali industries.

MPH型塑料磁力泵符合JB/T 7742-1995《小型磁力传动离心泵》标准，过流部件采用聚苯硫醚，不受大多数酸、碱、盐的侵蚀(除氧化性酸如浓硫酸、硝酸和王水等)，其性能接近于聚四氟乙烯的化学性能，在100℃以下能耐大多数有机溶剂，特别能耐汽油和甲醇的混和液，是酸碱工业中的理想用泵。

In order to solve these problems, first, activated carbon which was deashed by hydrochloride was modified through using concentrated sulfuric acid, concentrated nitric acid, hydrogen peroxide and potassium permanganate in the paper, the result showed that the modification of activated carbon is best through using concentrated sulfuric acid under 250℃ through analyzing the desulfurization efficiency and acidic oxygenous group on surface.

对上述问题，本文首先采用浓硫酸、浓硝酸、双氧水和高锰酸钾等氧化剂对盐酸脱灰后的活性炭进行化学改性，通过对改性活性炭的脱硫效果及其表面酸性含氧基团分析，得出在250℃的温度下采用浓硫酸改性活性炭效果最好。

Nanocrystalline Pb(Zr0.52Ti0.48)O3 was prepared from lead acetate, zirconium oxynitrate and tetrabutyltitanate by a sol-gel method.

以醋酸铅，硝酸氧锆，钛酸四丁酯为原料用溶胶－凝胶法制备了纳米Pb(Zr0.52Ti0.48)O3。

The CFb in blank control group was added with IMDM containing 10% FBS and those in Ang Ⅱcontrol group with Ang Ⅱ.The CFb in the 3 test groups were induced with Ang II,then added with Tau at dosages of 40,80 and 160 mmol/L respectively. Determine the proliferation of CFb by MTT method, the collagen content by oxyproline kit, the transforming growth factor- TGF-β1 (TGF TGF-β1) content by ELISA, the cell cycle by flow cytometer, the CFb NO content by nitrate reductase method, the iNOS activity by spectrophotometry, and the expression of iNOS protein by IFA.

胰酶消化法分离培养新生大鼠CFb，用Ang Ⅱ诱导促进其增殖，采用MTT法检测细胞增殖；羟脯氨酸试剂盒检测胶原含量；ELISA法测定转化生长因子β1(TGF-β1)蛋白的含量；流式细胞仪检测细胞周期；硝酸还原酶法、分光光度法和免疫荧光法检测CFb NO含量、一氧化氮合酶活性和iNOS蛋白的表达。

Methyl nitrate, N-nitrobis (2-hydro- xyethyl)-amine dinitrate, nitroglycerine and pentaerythrite tetranitrate, it is found that AM1 method is better than the other methods for predicting molecular geometry.

三种方法的计算结果与已报道的四个化合物(硝酸甲酯、吉纳、硝化甘油和太安)的实验结果相比， AM1法较好。

Alumina sols of different content were prepared by using Al3 as precusor, water as solvent, nitric acid as peptizer, ethylacetoacetate and polyvinylpyrrolidone as modified menstruum. We used dip-coating method and spin-coating method prepared of alumina films on the plane glass and used dip-coating method and rising liquid method inside the wall of the fiber.

以仲丁醇铝为前驱物、水为溶剂、硝酸为胶溶剂、同时加入乙酰乙酸乙酯和聚乙烯吡咯烷酮作为改性剂制备了不同浓度的氧化铝溶胶用提拉法和旋覆法在平板玻璃上镀膜，同时用提拉法和液面上升法在石英毛细管内壁上镀膜。

The electrode has been used for the determination of Fleroxacin in medicinal injection by the standard curve method. The procedures of this method are simple and the results obtained agree with those of pharmacopeial method.

本研究以氟罗沙星与硝酸铋形成的缔合物为电活性物，制备了PVC膜氟罗沙星涂丝选择电极，并用该电极对氟罗沙星注射液的含量进行了测定，结果与药典法相符。

HE EXTRACTION OF NITRIC ACID WITH DIBUTYL HYDROGEN PHOSPHONATE

膦酸氢二丁酯对硝酸的萃取

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。