多酸的

The performance and mechanism of corrosion inhibitions of POCA were studied bymethods such as weight-loss, electrochemistry, EDS, XPS and quantum chemistry. It isfound that POCA is cathodic corrosion inhibitor, having synergistic effect with HEDP andZn~(2+). The P and O atoms of phosphono have important electron density contribution toHOMO orbital and the electron gross orbital population is bigger than 1, so it is easy toform absorbing location between phosphono and metal resulting in good corrosioninhibition on mild steel.

通过利用失重法、电化学方法、扫描电镜、X光电子能谱、X-射线能谱和量子化学方法研究膦酰基羧酸的缓蚀性能及其机理，发现POCA是一种阴极型缓蚀剂，与HEDP、Zn~(2+)具有优良的协同增效作用；POCA分子中的膦酰基基团的P原子和O原子对HOMO轨道电荷密度贡献较大，且其轨道电子布居数均大于1，因此比较容易通过膦基与金属形成吸附位而对碳钢具有良好的缓蚀作用；对铜合金具有一定的腐蚀作用，但腐蚀作用比HEDP等有机膦药剂要小得多，同时与BTA具有优良的相容性，添加1mg／L的BTA则可以有效地防止铜合金的腐蚀。

This paper presents a study of Eucalyptus dunnii tissue culture, using its seeds as explants. The results reveal that MS medium is a suitable basic medium for its seeds to germinate and grow; that MS+KT1.0 mg/L+2, 4-D2.0 mg/L+Homocysteine30mg/L is a good medium to induce its seeds to dedifferentiate directly into callus; that H+6-BA2.0 mg/L+IAA0.2 mg/L is a good medium to make its bud on the seedling reproduce more buds; that MS+6-BA2.0 mg/L+NAA0.2 mg/L is a better medium to induce its root on the seedling into callus; that B5+6-BA2.0 mg/L+2, 4-D0.2 mg/L can induce its under-hypocotyl to differentiate into buds; and that B5+Ad2.0 mg/L+IAA0.2 mg/L can induce its under-hypocotyl into callus to generate normal buds.

以邓恩桉种子为外植体，探讨用最少种子快速繁殖最多幼苗的方法，结果表明：MS培养基是较适合邓恩桉种子萌芽和生长的基本培养基；诱导种子直接脱分化成愈伤组织的较佳培养基配方为MS+KT1.0 mg/L+2，4-D2.0 mg/L+半胱氨酸30 mg/L；以邓恩桉实生苗的芽来繁芽的较理想培养基配方为H+BA2.0 mg/L+IAA0.2 mg/L；邓恩桉实生苗的根诱导愈伤组织的较佳培养基配方为MS+6-BA2.0 mg/L+NAA0.2 mg/L；诱导邓恩桉下胚轴分化芽较佳培养基配方为B5+6-BA2.0 mg/L+2，4-D0.2 mg/L；诱导邓恩桉下胚轴脱分化为胚性愈伤组织的较佳培养基配方为B5+Ad2.0 mg/L+IAA0.2 mg/L。

On the days when dessert is a name given to a handful of chocolates and a little preserved ginger, when macedoine de fruits is the title bestowed on two prunes and a piece of rhubarb, then the orange, however sour, comes nobly to the rescue; and on those other days of plenty when cherries and strawberries and raspberries and gooseberries riot together upon the table, the orange, sweeter than ever, is still there to hold its own.

首先，橘子是日常生活中的常客，即便客观事实可能并非如此，但至少在水果店里，橘子确实是四季都有供应。）曾几何时，甜点仅仅就是一把巧克力加上一丁点腌制的姜，两个西梅脯加上一块大黄茎居然也美其名曰为水果什锦。那么相比之下，不管有多酸，橘子都可以说是解了燃眉之急，极大地丰富了人们的餐桌。又曾几何时，在那些衣食富足的年月，餐桌上樱桃，草莓，覆盆子和醋栗大聚会，好不热闹，但即便如此，橘子也依然能占有一席之地，而且此时的橘子吃起来无疑是最甜的。

Designing princeple and measuring programme which combines a manul instrument with artificial intelligence for data analysis were put forward. As an alternative, another approach with computer-sensor system is also proposed for future development of leather industry.

根据制革生产现场潮湿、多酸、碱、盐及电网波动大的实际情况，设计、制作了皮革手感信号的便携式检测仪，并创造性地提出了用便携式检测仪作现场检测，而用计算机以人工智能方法分析数据的实用皮革手感测定方案，以及与制革和皮件生产的未来发展趋势相适应的计算机检测分析系统。

Both niobic acid and niobium oxide can be used as either catalyst,promoter or support in the heterogeneous catalytic reactions,such as selective oxidation,hydration,hydrolysis,alkylation,dehydrogenation and hydrogenation,because of their acidic and redox properties.

作为一种新型的催化材料，铌酸-氧化铌由于其独特的酸性和氧化还原性正受到越来越多人的关注。它可以作为催化剂的活性组分、助剂或载体使用，在烃类转化、选择性氧化、水解、水合、缩合、加氢脱氢等若干酸碱和氧化还原反应中得到广泛的应用。

Synthesizing new compounds are always the goal of chemist. Recent ly, the progress of the hydrothermal synthesis method is giving a new method to synthesize new compounds. The hydrothermal synthesis method is prefectly applied to synthesizing the tunnling materials, micro-and meso-porous mat erials as well as some new materials, so this method obtained the intrest of che mist.

中文题名含有杂原子的金属－氧簇(V，Mo，W，P，As)的合成与结构副题名外文题名论文作者李亚丰导师裘式纶教授学科专业无机化学研究领域\研究方向学位级别博士学位授予单位吉林大学学位授予日期2002 论文页码总数70，68页关键词金属－氧簇化学多酸化学无机合成化学馆藏号BSLW /2003 /O611 /3 合成新结构和新组成的化合物一直是化学家们的目标，近代水热合成技术的发展为合成亲新化合物提供了一种新的方法，水热由于在合成具有孔道结构、微介孔材料以及一其它一些新型材料具有其它方法无可比拟的优越性，因此，越来越受到人们的重视。

Injection of 0.06mg had no effect on the puparial color of SEM, and injection of 0.06 to 0.22mg ofβ-alanine gave an intermediate phenotype.

注射试验证明，SEM蛹的黑化可能是由于多巴胺的增多或β-丙氨酸的减少引起的。

Small prostrate or ascending shrub having scarlet flowers and thin-fleshed succulent fruit resembling cranberries; sometimes place in genus Styphelia.

小的俯卧的或向上的灌木，有猩红色的花和果肉少的多汁的果实，类似酸果蔓的果实；有时归为s种。

On the other hand, sodium tungstate dehydrate complexed with oxalic acid can act as highly efficient catalysts for the transformation from alcohols to carbonyl compounds under controlled microwave irradiation and solvent-free conditions.

第二部分中，我们观察到，作为一种过程强化手段，微波具有显著的促进催化选择氧化反应加速进行的能力，这在多相的锰氧化合物体系和均相的钨酸钠—草酸催化体系中都有具体表现。

By depression there is a decreased amount of neurotransmitters in parts of the central nervous system, mainly deficiency of serotonin, but also to some extend of noradrenalin, acetylcholine, dopamine or gamma-amino-butyric acid, or the nerve cells do not react properly by stimulation from neurotransmitters.

忧郁症是有量下跌递质部分的中枢神经系统，主要是缺乏血清素，而且在一定程度上的去甲肾上腺素，乙酰胆碱，多巴胺或伽马-氨基丁酸的，或神经细胞的不恰当反应，由刺激神经。

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。