近些年来,耐温抗盐型PAM类水溶性聚合物的研制成为国内外聚合物驱油剂研究的热点课题.该类驱油剂的广泛使用,对生物有机体及周围生境存在潜在的影响.在本研究中,笔者以常见耐温抗盐丙烯酰胺系聚合物驱油剂为研究对象,以PubChem数据库为...近些年来,耐温抗盐型PAM类水溶性聚合物的研制成为国内外聚合物驱油剂研究的热点课题.该类驱油剂的广泛使用,对生物有机体及周围生境存在潜在的影响.在本研究中,笔者以常见耐温抗盐丙烯酰胺系聚合物驱油剂为研究对象,以PubChem数据库为检索源,通过分析GHS健康危害性数据(GHS Safety and Hazards)及毒性数据(toxicity),以期客观评价化学品对生物有机体及外部环境的危害性.同时,为耐温抗盐丙烯酰胺系聚合物驱油剂的科学使用提供参考.展开更多
The typeⅡ codes have been studied widely in applications since their appearance. With analysis of the algebraic structure of finite field of order 4 (i.e., GF(4)), some necessary and sufficient conditions that a ...The typeⅡ codes have been studied widely in applications since their appearance. With analysis of the algebraic structure of finite field of order 4 (i.e., GF(4)), some necessary and sufficient conditions that a generalized H-code (i.e., GH-code) is a type Ⅱ code over GF(4) are given in this article, and an efficient and simple method to generate type Ⅱ codes from GH-codes over GF(4) is shown. The conclusions further extend the coding theory of type Ⅱ.展开更多
文摘近些年来,耐温抗盐型PAM类水溶性聚合物的研制成为国内外聚合物驱油剂研究的热点课题.该类驱油剂的广泛使用,对生物有机体及周围生境存在潜在的影响.在本研究中,笔者以常见耐温抗盐丙烯酰胺系聚合物驱油剂为研究对象,以PubChem数据库为检索源,通过分析GHS健康危害性数据(GHS Safety and Hazards)及毒性数据(toxicity),以期客观评价化学品对生物有机体及外部环境的危害性.同时,为耐温抗盐丙烯酰胺系聚合物驱油剂的科学使用提供参考.
基金the National Natural Science Foundation of China (60743007)Fujian Province Young Talent Program (2006F3044)+2 种基金Province Natural Science Foundation of Fujian (JA04169)Province Education Department Foundation of Fujian (JB05331)Beijing Municipal Commission of Education Disciplines and Graduate Education Projects (XK100130648)
文摘The typeⅡ codes have been studied widely in applications since their appearance. With analysis of the algebraic structure of finite field of order 4 (i.e., GF(4)), some necessary and sufficient conditions that a generalized H-code (i.e., GH-code) is a type Ⅱ code over GF(4) are given in this article, and an efficient and simple method to generate type Ⅱ codes from GH-codes over GF(4) is shown. The conclusions further extend the coding theory of type Ⅱ.