一酸的

Effects of the components of chromating solution and influence of technological parameter on the chromate conversion coating are discussed.

研究了一种以钼酸盐为促进剂的铬酸盐转化处理工艺的配方和成膜机理，讨论了铬酸盐转化处理液中各组分的作用和工艺参数对铬酸盐转化膜层的影响，并对铝合金型材涂装前处理工艺流程和主要工序进行了说明。

An unstable acid known only in solution and as chromate salts.

一种不稳定的酸，已知仅存在于溶液中或作为一种铬酸盐。

It is shown that calcium carbonate can be decomposed in aqueous sodium dichromate solution and transformed to calcium chromate at ambient pressure and boiling temperature.

介绍了一种制取铬酸钙的新方法，利用重铬酸钠溶液分解碳酸钙，可以得到高纯度的铬酸钙。

A catalyst composition for the polymerization of propylene comprising one or more Ziegler-Natta procatalyst compositions comprising one or more transition metal compounds and one or more esters of aromatic dicarboxylic acid internal electron donors; one or more aluminum containing cocatalysts; a selectivity control agent comprising at least one silicon containing compound containing at least one C1-10 alkoxy group bonded to a silicon atom, and one or more activity limiting agent compounds comprising one or more aliphatic or cycloaliphatic carboxylic acids; alkyl-, cycloalkyl- or alkyl-ester derivatives thereof; or inertly substituted derivatives of the foregoing.

一种用于丙烯聚合的催化剂组合物，所述催化剂组合物包括：一种或多种齐格勒-纳塔主催化剂组合物，该主催化剂组合物包括一种或多种过渡金属化合物和一种或多种芳族二羧酸酯内部电子给体；一种或多种包含铝的助催化剂；选择性控制剂，该选择性控制剂包括至少一种包含硅的化合物，该化合物包括至少一种与硅原子连接的C 1-10 烷氧基；和一种或多种活性限制剂化合物，该活性限制剂包括一种或多种脂族或脂环族的单或聚羧酸类、其烷基-、环烷基-或烷基-衍生物、或上述惰性取代的衍生物。

Chapter 7 A Fused Silica PLOT Column Prepared with Nanotube Titanic Acid Adsorbent and the Influence of Treatment on Its Behavior In the chapter, the nanotubed titanic acid H〓Ti〓O〓(OH 〓 was synthesized in our laboratory, morphology and structure of nanotubed titanic acid was investigated, a fused silica PLOT column was prepared with used that as a new kind of stationary phase in gas-solid adsorption chromatography.

第七章 钛酸纳米管PLOT石英毛细管色谱柱的制备及热处理对色谱保留性能影响研究在实验室合成了具有较大比表面积和纳米管特性的钛酸纳米管，对其热处理前后的形貌和结构进行了表征，将其作为气-固色谱吸附剂制备出一种新型钛酸纳米管PLOT石英毛细管柱，同时考察了这种纳米管结构的钛酸作为固定相对C〓～C〓烷烃混合物、空气、SF〓以及CO和CO〓的分离能力。

An unstable acid known only in solution and as ''.

一种不稳定的酸，已知仅存在于溶液中或作为一种铬酸盐。

spectrophotometric method with phenol disulfonic acid ; ultraviolet spectrophotometer ; nitrate nitrogen ; comparison

本文通过对常用的酚二磺酸光度法和紫外分光光度法进行实验比对，同时调查云南省内两种分析方法考核的情况，从而找出两种方法的优缺点，供分析人员在实践中借鉴。l原理1.1酚二磺酸光度法测定的原理方法依据：GB7480一87《水质硝酸盐氮的测定酚二磺酸分光光度法》。用浓硫酸与苯酚作用生成酚二磺酸

The progress in the application of polyaspartic acid and its derivatives in scale inhibition,viscosity reduction,fertilizer synergism and super-absorbing networks were described in this article. polyaspartic acid ; synthesis ; scale inhibition ; viscosity reduction ; fertilizer synergia ; water-absorbing resin

聚天冬氨酸可以改变钙盐的晶体结构，是一种优良的阻垢分散剂，用于循环冷却水系统、锅炉及油气田水处理[1～3]；聚天冬氨酸具有良好的降粘作用[4]；聚天冬氨酸作为肥料增效剂，能促进植物生长[5，6]；它还具有优良的保湿性能，用于日用化妆品和保健用品的制造[7]；由聚天冬氨酸可制备高吸水树脂[8～10]；另外，由聚天冬

Acid treatment in an acid bath of Frosted glass bottles generated effects, and the organic spray painted in glass bottles on one or more colors.

酸处理在一种酸浴中产生玻璃瓶的磨砂效果，而有机喷涂则在玻璃瓶上涂上一种或多种色彩。

However, chromates have caused increasingly environmental concern. The need to find low toxicity alternatives to hexavalent chromium-based passivation treatment is of prime importance. Molybdate passivation can be used to replace chromate in a wide range of applications.

但由于铬酸盐钝化对环境的污染，寻找一种低毒的代替铬酸盐钝化的处理工艺是十分必要的，钼酸盐钝化是最有前途的一种。

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。