查询词典 melting point

The data of element analysis,melting point,IR and NMR for the product are consistent with the standard data,the purity exceeds 98%.3-methyl-2-oxobutanoic acid sodium ; sodium methoxide ; isobutyraldehyde ; diethyl oxalate

WSR-1熔点仪；Vario EL元素分析仪(德国E le-mentar公司)；Nexus 870型傅立叶变换红外光谱仪；aV500核磁共振仪。1.2 3-甲基-2-氧代丁酸钠的制备将15.4 g(0.28 mol)甲醇钠与60 mL(1.5 mol)甲醇装入500 m

The theory and experiment results all has verified that the melting point of polymer isdetermined by the lamellar thickness.

由于理论和实验都证明了高分子结晶的熔点是取决于晶片厚度的。

Final product is confirmed by melting point measuration andMS.

产品Ce_4经熔点测定和质谱认证。

After concrete structure is fired, the fire temperature can be judged by the analysis of the melting point of damage material, the surface color of concrete, the damage degree and the metallograph of reinforced bar.

混凝土结构遭受火灾后，通过对被燃烧物质的熔点，混凝土表面颜色、损伤程度以及钢筋的金相分析，可判定火灾的温度。

Samples of lactide with melting point 127℃ were conducted a quantitative analysis test by using non aqueous titration with sodium methoxide and Karl Fischer method.

用甲醇钠非水滴定法、卡尔－费休法对熔点为127℃的丙交酯样品进行了定量分析试验，测出残存的乳酸和水的质量分数分别为0.09％和0.07％左右，回收率分别为98.64％～101.2％和98.74％～101.1％。

Properties : White crystallization or powder , proportion 1.735 , melting point is 287 ℃, apt to dissolve in water , ethanol and propanone , aqueous solution is neutral , turn into the blood red sulphur cyaniding iron with molysite , reactionless with inferior molysite, salt function turns into dark blue sulphur cobalt cyanide, turn into white sulphur silver precipitating or black sulphur copper cyanide cyanide to precipitate with the silver salt or copper salt function with cobalt.

白色结晶或粉末，比重 1.735 ，熔点 28 7 ℃，易溶于水、乙醇和丙酮，水溶液呈中性，与铁盐生成血红色的硫氰化铁，与亚铁盐则无反应，与钴盐作用生成深蓝色的硫氰化钴，与银盐或铜盐作用生成白色的硫氰化银沉淀或黑色的硫氰化铜沉淀。

The author introduces the character of low melting point alloy and its applications in sheet metal forming, discusses the choice of the patternmaking material, contrasts the two mould-casting technologies, points out the issues in design of technology and mold, and taking the representative large sheet metal forming for example, specifies the compose and character of the die structure.

简要介绍了低熔点合金模具的特点及其在板料冲压工艺中的应用，对比介绍了两种铸模工艺，指出了工艺及模具设计时应注意的问题，并以典型大型薄板拉深成形模具为例，详细论述了低熔点合金冲压模具的组成及结构特点。

The yield of antioxidant A based on 0.05mol pentaerythritol was 93.5%, melting point was 154℃155.5℃.

在此条件下产品收率达到93.5%，熔点154℃155.5℃。

Then, N-(5-nitro-6-chloro-3-pyridinemethyl) phthalimide is obtained after the nitrating reaction of N-(6-chloro-3-pyridine methyl) phthalimide. The yield of the obtained product is 90.5%, and its melting point is 143.1~143.8℃.

缩合产物再经过硝化，合成N-（5-硝基－6-氯－3-吡啶甲基）邻苯二甲酰亚胺，其熔点为143.1~143.8℃，收率为90.5%。

Always recrystallize a product to constant melting point.

你总是可以通过对产物进行再结晶以得到恒定的熔点。

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。