顺丁烯二酸

Poly is synthesized by the directly reaction of maleic anhydride and ammonia in water.

以顺丁烯二酸酐和浓氨水为原料采用直接液相聚合的方法合成了聚天冬氨酸。

SCE. The peak height is directly proportional to the concentration of maleic acid over a range of 0.07～50μg/ml.

允许共存顺式与反式丁烯二酸的浓度比为1∶250.20次测量的相对标准偏差为1.1％。

The influence of microwave radiation on Ullmann reaction has been investigated by three Ullmann reactions, including triphenylamine formed by treating the diphenylamine with bromobenzene or Chlorobenzene which substitutes Iodobenzene; 4,4\'-dimethyltriphenylamine formed by treating 4,4\'-dimethyldiphenylamine with bromobenzene which substitutes Iodobenzene; 4,4\',4-trinitrotriphenylamine formed by treating 4-chloronitrobenzene with p-nitroaniline in this paper.

实验表明，在微波辐射条件下，顺式比反式迈克尔反应活性高；若在丁烯二酸的双键上引入甲基后，降低了进行迈克尔加成反应的活性；引入酯基对双键的影响比腈基有利于进行迈克尔反应，丙烯酸甲酯较丙烯腈的迈克尔反应活性高。

A range of waterborne alkyd resins has been prepared by fatty acid process, based on soybean fatty acid, trimellitic anhydride, and various polyols and polybasic carboxylic acids, which are modified with benzoic acid, maleic anhydride and oleic acid.

通过脂肪酸法，选用豆油脂肪酸、偏苯三甲酸酐和不同的多元醇、多元酸制备了一系列水性醇酸树脂，用苯甲酸、顺丁烯二酸酐和油酸对其改性进行了研究。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。