查询词典 orthosilicate

The device utilizes a lutetium yttrium orthosilicate scintillator crystal, curved photomultipliers, and Philips' proprietary TruFlight technology , which uses the time difference -- in pico seconds (10-12 seconds)-- between the detection of coincident events to more accurately identify the origin of the annihilation.

飞利浦医疗系统PET/CT产品全球市场总监Jim Cavanaugh介绍说，采用Gemini TF进行全身PET扫描用时不到10分钟，此前进行同样的检查需要15分钟或更长时间，对肥胖病人同样如此；如果医生需要获得敏感性或特异性更高的PET图像，获取图像的时间还是维持在原来的水平上，这需要根据病人临床情况而决定。

SBA-15 was synthesized using two different silica sources,sodium metasilicate(Na2SiO3·9H2O) and tetraethyl orthosilicate.

采用两种不同硅源——硅酸钠(Na2SiO3.9H2O)和正硅酸四乙酯合成介孔分子筛SBA-15。

Keywords sodium metasilicate;tetraethyl orthosilicate;SBA-15 zeolite

硅酸钠；正硅酸四乙酯； SBA-15分子筛

The excess of ethyl orthosilicate should render the chain terminal unreactive toward the crosslinking...

降解是由于水在二月桂酸二丁基锡酯或它的水解产物月桂酸催化下使聚二甲基硅氧烷主链的Si—O—Si键水解所引起的。

Highly ordered mesoporous Zr-Ce-SBA-15 silica with hexagonal-platelet morphology was synthesized through a hydrothermal route by using pluronic P123 as a template, tetraethyl orthosilicate as a silica source, zirconyl chloride and cerous nitrate as a precursor. The main strategy of this method was to utilize the acidity self-generated from the hydrolysis of inorganic salts in the aqueous solutions, where no addition of mineral acids was necessary.

以P123为模板剂，正硅酸乙酯为硅源，氯化氧锆和硝酸亚铈为无机前驱盐，在不外加无机酸的条件下，利用无机前驱盐自身水解产生的弱酸性环境，通过水热合成路线一步合成了具有大的径轴比、短孔道、六方板状形貌的Zr-Ce-SBA-15介孔材料。

Silicone/SiO2 organic-inorganic hybrid sol have been prepared from tetraethyl orthosilicate as inorganic precursor, methyl triethoxysilane and diphenyl dimethoxy silane as organic precursor, the hydrochloric acid and water as catalysts, by sol-gel method through the hydrolysis-polycondensation reaction.

采用溶胶－凝胶法，以正硅酸乙酯为无机相前驱体，甲基三乙氧基硅烷和二甲基二甲氧基硅烷为有机相前驱体，盐酸和水为催化剂，通过水解－缩聚反应制备了有机硅／SiO2有机－无机杂化溶胶。

However, in actual practice, the relative quantity of ethyl orthosilicate to hydroxysiloxane used is always many times larger than the stoichiometric ratio.

将硅橡皮分别在空气及氮气中进行高温处理，并测定其溶胀度的变化的结果，证明这现象是由于硅橡皮在高温下发生降解及氧化所致。

In the experiments, some facters such as the proportion of tetraethyl orthosilicate to coupling agents and distilled water to tetraethyl orthosilicate,the concentration of ammonia,reaction time and reaction temperature were controlled.

研究了正硅酸乙酯与偶联剂的比例、水硅比、氨水用量、反应温度与反应时间等因素对包覆效果的影响，其中重点讨论了偶联剂的添加方式对成膜效果的影响。

Silica sol without ethanol was prepared with tetraethyl orthosilicate as precursor.

以硅酸乙酯为水解前驱体，制备了有机硅水溶胶体系。

Metal/ oxide composite aerogels can be used as catalysts because of their high specific surface area. In this paper, Co-rich Co/SiO2 composite aerogels in which mass fraction of Co can reach 66%were firstly prepared by sol - gel process of Co-containing tetraethyl orthosilicate. The influence of H2O, catalyst, solvent and composition of Co-containing tetraethyl orthosilicate on the sol-gel process are discussed.

本工作首次采用含钴硅酸乙酯进行溶胶～凝胶反应来制备高钴含量的纳米级Co/SiO2复合气凝胶，制备的Co/SiO2复合气凝胶中n：n的比例最高可达2：1，且复合气凝胶中的Co含量可在小于66％的范围内任意调节，并系统研究了水量、催化剂浓度、溶剂量及含钴硅酸乙酯的组成对溶胶-凝胶过程的影响。

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。