查询词典 silica

The chemical constituents of Huperzia serrata Trev. are mainly flavonoids, triterpenoids and alkaloids. In order to get further comprehension of lycopodium alkaloids, we studied the low-polar section of the alkaloids extraction of Huperzia serrata and 19 alkaloids were isolated by ways of silica gel, RP-18 and Sephadex LH-20 etc. All of their structures, including five new compounds and two known ones that were firstly found from this genus, were elucidated with the help of Mass, IR, NMR spectra and so on. The five new alkaloids (HS-07, HS-08, HS-09, HS-10 and HS-11) are belonged to lycopodine class. The other two ones that were new to this genus (HS-18 and HS-19) are belonged to miscellaneous group.

蛇足石杉的主要化学成分为黄酮，三萜和生物碱，为进一步了解该植物的生物碱成分，我们研究了蛇足石杉氯仿总碱低极性部位的生物碱成分，运用正相硅胶、反相RP-18、凝胶LH-20等方法分得了19个生物碱，并通过质谱、红外、核磁共振等波谱鉴定了它们的结构，其中5个为新化合物，2个为首次从该属植物中分离得到的化合物，所分得的新化合物：HS-07、HS-08、HS-09、HS-10和HS-11均为lycopodine类石松生物碱，首次从该属植物中分得的化合物为miscellaneous类：HS-18和HS-19。

Magnetizable composite silica nanoparticles with high magnetization were synthesized by sol-gel method.

采用溶胶凝胶法合成具有快速磁场响应能力的SiO2复合磁性纳米粒子。

Experimental results shoued that the magnetizable composite nanoparticles were coated by the silica perfectly and the particles had high acid resistance and high magnetization.

结果表明生长3层SiO2后复合粒子的表面完全被SiO2所包覆，粒子具有高的磁含量和快速的磁场响应能力，并具有高的抗酸性。

In this paper,we studied the magnetostriction of amorphous Tb-Fe silica baseplate thin film that prepared by sputtering at room temperature.

本文研究由溅射法制备的非晶态Tb-Fe硅基薄膜在室温下的磁致伸缩特性，从中找到一种在低磁场下仍具有较大磁致伸缩性的材料。

The curing condition, the maximum size of coarse aggregate and silica fume have certain effects on the strength, fracture properties and brittleness of concrete.

养护条件，粗骨料最大粒径和硅灰对混凝土的强度，断裂性能和材料脆性都有一定影响。

Of Shenzhen City Noor large supply of 2 D/3D (PS / 2, serial port) mechanical mouse, the ball in the silica gel, and other pieces of plastic raw materials rose sharply at the same time, our products maintain the original price is not the policy of floating , Won the Guangdong Province and Shenzhen many colleagues around the orders.

深圳市努尔电子有限公司大量供应2D/3D（PS/2、串口）机械鼠标、在硅胶球、塑胶件等原材料大幅上涨的同时，我们的产品保持原有价格不上浮的政策，赢得了广东省各地及深圳很多同行的订单。

Silicalites, predominated by pelitic silicalite, occur in collisional zones and back-arc basins. In the collisional zones, they occur as rock sheet as an important part ofophiolitic mé lange, belonging to ophiolitic mélange type silicalite. In the back-arc or interarc basin, they occur as pelitic silicalite intercalation varying in thickness, characteristic of "silica merl",and belonging to abyssal back-arc basin type or carbonate type silicalite. In the magmatic arc, they occur as intercalation related to volcanic hydrotherm or volcalic exhalation, belonging to volcanic arc type silicalite.

在硅质岩方面：冈底斯构造带侏罗系硅质岩主要属泥质硅质岩，在各个碰撞结合带和弧后盆地中均有产出，主要的产出状态有：①在碰撞结合带中呈岩块产出，构成蛇绿混杂岩的重要组成部分，属蛇绿混杂岩型硅质岩；②在弧后或弧间盆地中呈厚度不等的泥质硅质岩夹层产出，常具"硅灰泥"特征，属弧后深水盆地型硅质岩；③呈夹层状产于弧火山岩系中，属火山热液或火山喷气型硅质岩。

Preparation of pure chlorophylls and pheophytins was performed by microcrystal cellulose column chromatography and silica gel thin layer chromatography respectively.

3分别采用微晶纤维素柱色谱和硅胶薄层色谱制备出较纯的系列叶绿素衍生物。

With corn starch as main raw material,the optimal dispersing process for starch film modified by nano-silica was studied and the structure of the film was analyzed by infrared spectroscopy,X- ray diffraction and scanning electron micrography.

以玉米淀粉为主要原料，研究了蚋米SiO_2改性淀粉薄膜的最佳分散处理工艺，并通过测定样品的红外吸收光谱、X-射线衍射图和扫描电镜照片对该膜的结构进行了分析。

An SPME unit consists of a certain length of fused silica fiber coated with stationary phase, and a holder which looks like a microliter syringe.

SPME装置形如一微量进样器，某些气相色谱的固定液涂渍在一根融溶石英细丝表面构成本取头。

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。