碳酸钙

Through analyzing the contour map of soil spatial variability, the same changing law was found in soil organic matter and calcium carbonate content in the horizon direction, which showed that higher soil organic matter and calcium carbonate content appeared in the points closer to the village, forming a concentric circle.

经过对土壤特性空间分布等值线图的分析得出：在水平方向上，土壤有机质和碳酸钙均具有相同的变异规律，距离村庄越近土壤有机质和碳酸钙含量越高，以村庄为回心土壤有机质和碳酸钙含量呈同心圆式的空间变异特征。

The relationship between physico-chemical properties of nano-CaCO〓 and surface treating technology was studied. The results showed the coating model of micron CaCO〓 was not suitable to nano-CaCO〓. The influence of dosage of treatment agent on nano-CaCO〓 dispersion degree in matrix was studied, the results indicated it only need to passivate some active zone on nano-CaCO〓 surface.

研究结果表明，微米粒子的表面包覆活化理论不适宜用来指导纳米粒子的表面处理，在对纳米碳酸钙进行表面处理时，不需要在纳米碳酸钙表面形成完整的包覆层，只需对纳米粒子表面的部分活性点进行钝化即可，即纳米碳酸钙表面有限钝化。

Used the TDYM to get the image diagraphs of observation of the veinsof the floor and measure its wideness.

改变填料重质碳酸钙的用量，研究了不同碳酸钙含量对地板的力学性能、电学性能和硬度的影响情况，确定重质碳酸钙的用量应小于30份。

The calcium sulfate was dissolved and led to the rapid increase of calcium ion concentration in the solution. So the calcium sulfate is not suitable for being seed crystal of low-salt concentration. The quartz sand and calcium carbonate both can be used as seed crystals, but it is much faster and more complete to use calcium carbonate as seed crystal compared with using quartz sand.

当硫酸钙加入处理液中发生了硫酸钙溶解现象，导致溶液钙离子浓度迅速增加，故硫酸钙不适合做低浓度盐水的晶种，而石英砂和碳酸钙均能对钙离子的结晶起到效果，但碳酸钙做晶种对钙离子的结晶更快捷、更彻底，在条件允许的情况下，采用碳酸钙做晶种为宜。

The calcium carbonate crystal is needle short fiber-typed, its length is 2-8 micron and width is 0.3-1.5 micron, the ratio of length and diameter is 5-10, its content of vaterite calcium carbonate is larger than 90% with small particle on the surface of.

该碳酸钙晶体为针状短纤维形，其尺寸长为2-8微米，宽为0.3-1.5微米，长径比在5-10，球霰石型碳酸钙含量大于90％。该针状短纤维碳酸钙晶体表面附载有小颗粒。

The synthetic technologies of calcium carbonate whiskers are reviewed, most of which are carried out in the normal gravity environment by adding some kind of morphology-control additive or needle-like crystal seeds of calcium carbonate supplemented with certain phosphate so as to prompt the crystal of calcium carbonate whiskers to grow in a certain direction to the reaction system.

摘 要：晶须碳酸钙的合成技术备受关注，其中绝大多数方法是在常重力场中，通过向反应物系中添加某种晶形控制剂，或预先添加针状碳酸钙晶种，并辅以能够促使碳酸钙晶体沿单一方向生长的磷酸系助剂。

The scale inhibition performance of PASP-based composite on both calcium carbonate and calcium sulfate was investigated under different conditions.The calcium carbonate crystal samples were characterized by SEM technique,and the results showed that the PASP-based composite cou...

利用扫描电子显微镜对碳酸钙晶型进行了分析，结果表明：聚天冬氨酸复配物可使碳酸钙晶体发生明显的扭曲现象，碳酸钙结晶更加细小分散。

Activation of heavy calcium carbonate with aluminates and other modification agents was studied, and the activation degree of calcium carbonate and the viscosity of its mixture with paraffin were characterized.

研究了铝酸酯等复合处理剂对重质碳酸钙的活化处理方法，对制得的活性重质碳酸钙的活化度及石蜡油/碳酸钙混合物的粘度行为进行了表征。

Light calcium carbonate, ACC, nanometer superfine calcium carbonate, magnesium carbonate, trihydrate alumina, silica white, strontium carbonate, barium carbonate, potassium carbonate, rubberlith, rongalite, permanent white, lemery, microspheroidal catalyst, magnesium hydrate, bluestone, nickel salt, sodium molybdate, sodium chloride, potassium chloride, calcium chloride, sodium fluoride, cryolite, iron oxide red, lithium hydroxide, zirconium hydroxide, calcium phosphate, sulfur, etc.

轻质碳酸钙、活性碳酸钙、纳米级超细碳酸钙、碳酸镁、氢氧化铝、白炭黑、碳酸锶、碳酸钡、碳酸钾、立德粉、保险粉、硫酸钡、硫酸钾、微球催化剂、氢氧化镁、硫酸铜、硫酸镍、镍酸铵、钼酸钠、氯化钠、氯化钾、氯化钙、氟化钠、冰晶石、氧化铁红、氢氧化锂、氢氧化镍、氢氧化锆、磷酸钙、硫磺等。

The chromatic aberration was decreased for filler adding, and the decrease was the biggest by CaCO3, the smallest decrease is TiO2. The chromatic aberration decreased gradually with CaCO3 dosage, however, the chromatic aberration changed little when CaCO3 dosage is greater than 20%; also the two-sidedness of paper was improved by filling.

填料的使用明显降低了色差值，其中降低最显著的为碳酸钙，最少的二氧化钛，碳酸钙用量的增大导致色差值逐渐降低，当碳酸钙用量大于20%后，色差值变化很小，但加填改善了色差值两面差的问题。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。