查询词典 carbonate

In the second part, the supported mesoporous sieve solid base KNO_3/MCM-48 and KAc/MCM-48 were prepared. And it was the first time that KNO3/MCM-48 and KAc/MCM-48 were used as catalysts for the synthesis of dipropyl carbonate by transesterification of propanol and dimethyl carbonate.

第二部分研究了负载型KNO_3/MCM-48和KAc/MCM-48固体碱的的制备，并首次将这类催化剂应用到丙醇和碳酸二甲酯酯交换法合成碳酸二丙酯的反应中。

With the seismic profile and the comparison between the eustatic sea level change and sequence, the authors find that there developed different scales of reef and carbonate platforms in the sag. These reef and carbonate platforms have many developing stages which can be correlated with the eustatic sea level change and evolutionary stages, besides, they all have preferable hydrocarbon potential.

通过地震资料的解释及海平面变化曲线与层序的对比发现，琼东南盆地南部深水凹陷发育有规模大小不等的生物礁和碳酸盐岩台地，而且这些生物礁和碳酸盐岩台地的发育与海平面变化曲线和构造演化的阶段可以对应起来，应具有较好的油气勘探潜力。

Based on the analysis of sequence stratigraphy and seismic stratigraphy of carbonate platforms, especially to the ones in Dongsha and Xisha, this dissertation has identified, for the first time, three major and several minor drowning events of the platforms since Tertiary. Drowning events in the four carbonate platforms, especially in Dongsha Platform, coincide with major global eustatic cycles raised by B.

在经过高技术处理的地震剖面上，淹没层序的特征是顶部同相轴呈光滑的双轨连续强反射，特殊处理后表现出高波阻抗、高密度和强瞬时振幅等特征，还表现为高的速度梯度值和高的剩余速度梯度值，甚至在局部区域出现本层层速度比下部地层层速度高的现象。

Some soil chemical properties, as pH of soils, cation exchange capacity, calcium carbonate, ferriferous oxide and organic matter are studied. Chromium speciation is mainly affected by soil pH, CEC and calcium carbonate, but little by ferriferous oxide and organic matter.

所研究的土壤化学性质中，土壤pH值、阳离子交换量以及碳酸盐量对土壤铬形态分布及生物有效性影响较大，铁氧化物与有机质含量对土壤铬形态的分布及生物有效性有一定的影响。

The morphology of calcium carbonate scale withthe presence of the PAA is not in order any more, but can be still observed the shapeof cubic structure. The crystal morphology of calcium carbonate scale with addingP is completely destroyed, and XRD spectrums show the quantity ofcalcite reduces, so the scales become loose, spongy, floccular and amorphous.

添加PAA后尽管表面不再平整但仍能观察到比较规整的四面体晶体结构；而添加P后晶体形状被彻底破坏，垢样成为疏松、多孔、絮状的无定形聚集体。X衍射谱图也表明，添加P后垢样中方解石含量减少甚多，垢样变得疏松。

The strata between the carbonate rocks of the Chaguoluoma Formation (Devonian-Early Carboniferous) and carbonate rocks of the Xiala Formation consist mainly of clastic rocks with limestone, which are marked by glaciomarine deposits in terms of sedimentation and mixing of Gondwanan and Tethyan faunas in terms of fossils.

古生物群混生的现象为石炭纪—二叠纪的特提斯生物区与冈瓦纳生物区之间的地层和古生物对比建立了一座桥梁。永珠组中上部地层中同时产有牙形石和腕足类，牙形石的研究表明其时代为晚石炭世莫斯科期，而腕足类的研究则表明其为早二叠世萨克马尔期。

Strontium-doped solid solution of hollandite was successfully prepared using strontium carbonate (SrCO3), barium carbonate (BaCO3), alumina (Al2O3), and titanium oxide (TiO2) as raw materials by designing formulas and high temperature solid phase reaction.

以碳酸锶(SrCO3)、碳酸钡(BaCO3)、氧化铝(Al2O3)和二氧化钛(TiO2)为原料，通过配方设计，用高温固相反应合成掺锶碱硬锰矿固溶体。

The experiments show that one portion of amino organic compounds in the shell is changed to the volatilizable amine and the other portion is transformed to the involatile nitrate after pyrogenation.The organic compounds disappear completely at 600℃.They also show that the aragonite phase of calcium carbonate in pearl shell chang with temperature;the aragonite phase transforms to calcite at 500℃, but some of organic compounds is still residual;and calcium carbonate begins to decompose to calcium oxide at 600℃.

实验发现，贝壳中的氨基酸类有机物热降解后部分以胺的形式挥发出来，另一部分则转化为不可挥发的硝酸盐的形式，600℃有机物完全消失；同时，贝壳碳酸钙的文石晶相随温度而变化，500℃时转变为方解石结构，其中仍有部分有机物残留，600℃开始分解为氧化钙。

Using manganous sulfate(MnSO4) as raw material,ammonium hydrogen carbonate(NH4HCO3) as precipitating agent and sodium dodecyl sulfate as particle size controller and through the process of quick addition of MnSO4 and NH4HCO3 solutions at same time,monodisperse submicron manganous carbonate(MnCO3) spherical particles were prepared by controlling suitable reaction crystallization conditions.

以硫酸锰为锰源，碳酸氢铵为沉淀剂，十二烷基硫酸钠为粒径控制剂，采用硫酸锰和碳酸氢铵两种溶液快速同时加入的方式，通过控制合适的反应结晶条件，制备出亚微米级单分散球形碳酸锰颗粒。借助扫描电镜、X射线衍射、粒度分析仪等研究了反应结晶条件对碳酸锰粒径和形貌的影响。

Because of the solubility of carbonate rock,the instability of karst soil and the vulnerability of karst vegetations,the risk of water and soil loss is bigger in carbonate rock areas than in noncarbonate rock areas.

由于碳酸盐岩的可溶蚀性、所形成土壤的不稳定性及碳酸盐岩植被的脆弱性等特征，在碳酸盐岩区水土流失的风险较非碳酸盐岩区更大，水土流失敏感性受岩性的影响比非碳酸盐岩地区更明显。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。