排序方式： 共有46条查询结果，搜索用时 19 毫秒
31.
32.
应用皂化回滴法分析C9－DMP体系中DMP的含量。试验确定了最佳皂化温度、皂化时间,并推导出计算DMP含量的公式。 相似文献
33.
Structural deformation of nitro group of nitromethane molecule in liquid phase in an intense femtosecond laser field 
下载免费PDF全文
下载免费PDF全文 The structural deformation of NO_2 group induced by an intense femtosecond laser field of liquid nitromethane(NM)molecule is detected by time-and frequency-resolved coherent anti-Stokes Raman spectroscopy(CARS) technique with the intense pump laser. Here, we present the mechanism of molecular alignment and deformation. The CARS spectra and its FFT spectra of liquid NM show that the NO_2 torsional mode couples with the CN symmetric stretching mode and that the NO_2 group undergoes ultrafast structural deformation with a relaxation time of 195 fs. The frequency of the NO_2 torsional mode in liquid NM(50.8±0.3 cm~(-1)) at room temperature is found. Our results prove the structural deformation of two groups in liquid NM molecule occur simultaneously in the intense laser field. 相似文献
34.
35.
36.
螯合剂与牛血清白蛋白竞争镍作用的研究 总被引：1，自引：0，他引：1
用凝胶色谱法研究了13种螯合剂使牛血清白蛋白镍配合物BSANi(Ⅱ)中的镍活动化的能力,发现DTPA、NTA等氨羧类螯合剂有较好的竞争能力,而巯基类较差。用透析法研究了螯合剂与BSANi(Ⅱ)反应动力学机理,结果表明,在pH7.4和4℃时,L-组氨酸、EDTA为解离机理,而亚氨二乙酸,二乙三氨五乙酸为加合机理。测定了有关的动力学参数,依据竞争能力参数F讨论了可能作为治疗镍中毒的促排螯合剂。 相似文献
37.
Chinese culture is like a vast starry sky where poetry and idioms are the bright pearls. This article followed the steps of Dahua and Xiaoxue into a primitive tribe, where they explored the charm of chemistry in poetry and idioms and appreciated the profoundness of Chinese culture. 相似文献
38.
39.
40.