Atmospheric precipitation

In this ***,nano-particles of NiCuZn ferrites powders were prepared with nickel nitrate,zinc sulfate,copper sulfate and ferrous sulfate as starting materials and ammonium oxalate as the precipitator by employing co-precipitation technique using oxalate precursors.Excellent composition uniformity NiCuZn ferrite powder can be obtained after drying and calcination.Toroidal samples were obtained after being formed and sintered.

本文以硫酸镍、硫酸铜、硫酸锌、硫酸亚铁和草酸铵为原料，应用化学共沉淀法制得分布均匀的先驱粉，经烘干、煅烧制成成分均匀性极佳的NiCuZn铁氧体粉末，再经成形和烧结等工艺，最后制得环形NiCuZn铁氧体材料。

For ammonium sulphate precipitation, ammonium sulphate with different concentrations was added to culture filtrate.

再后，论文根据现有实验室的实验条件，选择硫酸铵盐析、凝胶层析和CHT层析对角蛋白酶的粗酶进行了纯化。

Thirdly, according to our laboratory conditions, we determined ammonium sulphate precipitation followed by gel chromatography and CHT chromatography to purify the keratinase from crude enzyme.

这说明了在羽毛发酵前进行适当的处理是非常必要的，可以降低羽毛自身结构对降解产生的不利影响。

Antimony-doped tin dioxide nanometer powders were prepared by wet chemical co-precipitation method using tin tetrachloride (SnCl4), trichloride antimony (SbCl3) and ammonium carbonate (NH42CO3 as raw materials.

研究絮凝剂聚丙烯酰胺对锑掺杂二氧化锡前驱体的固液相分离过滤速度和产物ATO粒径的影响及其相互作用机理。

Wax and asphalt solid precipitation in oil and gas recovering process is a problem considering very much at home and abroad in the petroleum industry.

油气开采过程中的蜡质和沥青质等固相沉积问题，是目前国内外研究的热点和难点。

Precipitation Barium sulphate production process is complicated, high cost and contains acid, alkali, salt.

沉淀硫酸钡生产工艺复杂，成本高，而且其中易含有工艺过程中必须使用的，没有去除彻底的，在摩擦材料中起负作用的酸、碱、盐。

From the above instructions can see, chemical composition of barite powder and the chemical composition of Precipitation Barium sulphate is same, low content,But barite powder production process is simple,low cost.

从以上说明可以看出，重晶石粉和沉淀硫酸钡的化学成分是相同的，含量稍低，但是重晶石粉生产工艺简单，成本低。

So as long as the choice of the high grade size in 325m above barite powder, it can completely replace Barium sulphate precipitation, and can have better effects than Barium sulphate precipitated

所以只要选择品位高的粒度在325目以上的重晶石粉，就完全可以代替沉淀硫酸钡，而且可以起到比沉淀硫酸钡更好的效果。

Precipitation Barium sulphate viscous, easily scattered and mixing.

沉淀硫酸钡粘滞，易结团，不易分散和混合均匀。

Based on the phenomena that the particles of product Al_3 have similar and big size but with poor intensity in sintering process whereas in Bayer process they have good intensity with poor particle size,this paper systematically studied the effect of carbonization seeds on precipitation of sodium aluminate solution.

结合烧结法氧化铝生产过程中存在氢氧化铝粒度均匀、粗大，但强度较差；拜耳法生产的氢氧化铝强度好，但粒度存在周期性爆发细化的问题，系统研究了碳分晶种对铝酸钠溶液分解的影响。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。