查询词典 chemical

I have performed the design of several massive industrial and chemical process structures, such as a $430 MM chemical plant for Wellman in Mississippi and the rebuilding of a $350 MM Milliken carpet plant in Georgia.

我参加过许多大型的工业和化工过程结构的设计，例如为威尔曼在密西西比建一个桩柱每毫米430美元的化工工厂；为美丽肯在乔治亚州重建一个桩柱每毫米350美元的地毯工厂。

The chemical composition and physical-chemical properties of GG-17 is very close to Pyrex-7740 glass used by Westinghouse.

它的化学成分、理化性能和美国西屋公司用的Pyyex-7740玻璃相当。

Is the Ministry of Chemical Industry Corporation and China Chemical Whetstone sentinel manufacturers, the market resources of member units, the valves Association.

是化工部和中国油石化工总公司定点生产厂家，资源市场成员单位，中国阀门协会会员。

There was no obvious correlation between relative lipophilicity and activity in the current study. Na2Fl showed obvious synergetic action to other xanthene derivatives; it also show obvious synergetic action as combined lipophilic xanthene chemical and hydrophilic xanthene chemical.

由物化性质和生物活性的测试结果可知：光敏生物活性的测试与单线态氧的测试结果保持了高度的一致性，用单线态氧的产率这个指标来评价对微生物的光敏活性比用亲脂亲水性指标更为有效。

Pre-test for chemical constituents and Screening of acaricidal active part of clove: The possible chemical compounds of clove were checked using tube-test method.

丁香化学成分预试与杀螨活性部位筛选：采用试管法对中药丁香的化学成份进行了预试。

Efficacious drugs were made of these species for treatment of cough, phlegm, breathe heavily, especially, to cure lung disease. We have investigated on the Chemical constituents of Adenophora stenanthina subspecies xifengsis collected from Gansu Qingyang, and twenty four compounds were isolated from ethanol extraction by chromatography technigues. Twenty compounds were identified by means of chemical and spectra methods（IR, FAB-MS, EI-MS,〓,〓, DEPT , among which three compounds were new as 3βvanilloyloxy-stigmast-5-ene-7β-one; 3β-Vanilloyloxy-stigmast-5-en-7 β-ol; 3β-vanilloyloxy-stigmast-5-en-7β, 15 〓-diol.

我们对采自甘肃庆阳的西峰沙参Adenophorastenanthina subsp.xifengensis）进行了化学成分的研究，利用现代层析手段从该植物的乙醇浸膏中分离出二十四个化合物，经化学方法和波谱技术（红外，质谱，核磁共振谱）鉴定了二十个化合物的结构，其中三个为新的化合物，它们分别是：豆甾-5-烯-7-酮-3β-香草酸酯；7β-羟基-豆甾-5-烯-3β-香草酸酯；7β，15ξ-二羟基-豆甾-5-烯-3β-香草酸酯。

One dangerous chemical is called Alar, a liquid chemical used to preserve apples.

危险化学品是一个叫做阿拉尔，液体化学用来保存苹果。

This article analyses some basic conceptions that are comparatively vayue or even wrong wrong in the teaching of middle school chemistry, like the definition of chemical change, the influence of concentration on a chemical reaction , the structure of oxacid,and the acidity of sulfuric acid, the acidity of carbonic acid, and the conversion of allotropic substance.

分析了中学化学教学中的几个比较模糊甚至错误的基本概念，如化学变化、浓度对化学反应速度的影响、含氧酸的结构、硫酸的酸性、碳酸的酸性、热化学方程式的表示法、同素异形体间的转化等，并从大学化学角度加以澄清，以便使大一学生更准确地理解和掌握这些基本概念。

To further study the chemical constitutes of lipophilic active parts, we prepared Alc95% and Alc50% according to original literature. 20 compounds were isolated by using macroporous resin, silica gel, polyamide, Sephadex LH-20, Rp-18, preparative TLC and preparative HPLC chromato-graphy. The structures of them were elucidated by means of physical and chemical properties, modern spectroscopic analysis techniques—UV、IR、 EI/MS、ESI/MS、〓H-NMR、〓C-NMR、DEPT、HMQC、HMBC. They are nine anthraquinones: chrysophanol (95-1), physcion (95-2), emodin (95-5), aloemodin (95-7), rhein (50-1), sennoside A or B (50-6),ω-hydroxylemodin (95-10), chrysophanol-8-0-β-D-glucoside (95-12), aloemodin-ω-0-β-D-glucoside (95-13); three phenanthaquinones: tanshinone ⅡA (95-3), cryptotanshinone (95-6), tanshinone Ⅰ(95-4); one isoflavone: 7, 3'-dihydroxyl-5' methoxyisoflavone (95-14) and protocaechuic aldehyde (95-9), protocaechuic acid (95-11), astragaloside Ⅳ(50-4), amygdalin (50-5), 2, 3, 5, 4'-tetrahydroxylstilbene-2-0-β-D-glucoside (50-3),-catechin (50-2), cinnamic acid (95-8). Among them, 3'-dihydroxyl-5' methoxyisoflavone (95-14) is a new compound.

经过溶剂萃取、大孔吸附树脂富集、Sephadex LH-20精制、制备TLC及Semi-pre HPLC等手段从中分离了20个化合物，利用理化性质和波谱技术(UV、IR、EI／MS、ESI／MS、〓H-NMR、〓C-NMR、DEPT、HMQC、HMBC)相结合鉴定了它们的结构，分别为9种蒽醌类化合物：大黄酚，大黄素甲醚，大黄素，芦荟大黄素，大黄酸，番泻苷A或B，ω-羟基大黄素(ω-hydroxylemodin)，大黄酚-8-0-β-D-葡萄糖苷(chrysophanol-8-0-β-D-glucoside)，芦荟大黄素-ω-0-β-D-葡萄糖苷(aloemodin-ω-0-β-D-glucoside)；3种菲醌类化合物：丹参酮ⅡA(tanshinoneⅡA)，隐丹参酮，丹参酮Ⅰ(tanshinone Ⅰ)；1种异黄酮：7，3'-二羟基-5'-甲氧基异黄酮（7，3'-dihydroxy-5' methoxyisofla-vone）以及原儿茶醛，原儿茶酸，黄芪甲苷(astragaloside Ⅳ)，苦杏仁苷，2，3，5，4'-四羟基二苯乙烯-2-0-β-D-葡萄糖苷（2，3，5，4'-tetrahydroxylstilbene-2-O-β-D-g1ucoside），Z—儿茶素，桂皮酸。

Along with the development of the global economy , especially the development of electronics , automotive , and chemical industry , the solar cells with polysilicon and monocrystalline silicon as raw material , organosilicon industry with chemical silicone as raw material , and silicon - alumium alloy with metallurgical silicon as raw material have become the domestic and foreign investment spot in recent Years , arousing the wide attention.

随着世界经济的发展，特别是电子、汽车、化学工业的发展，以多晶硅、单晶硅为原料的太阳能电池，以化学级工业硅为原料的有机硅工业，以冶金级工业硅为原料的硅铝合金，近年来成为国内外投资的热点，引起了全社会的广泛关注。

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。