The M/G values of different sodium alginate were studied by means of H-NMR. The alginate fiber was prepared via wet-spinning technology. The effects of M/G, the concentration of sodium-alginate, the concentration of ...The M/G values of different sodium alginate were studied by means of H-NMR. The alginate fiber was prepared via wet-spinning technology. The effects of M/G, the concentration of sodium-alginate, the concentration of the coagulation bath and coagulating time on the absorptive ability of alginate fiber were discussed. The results show that the absorptive ability to different substances varies in such order： physiological saline 〉 blood 〉 tap water 〉distilled water. The absorptive ability of the alginate fiber increases with the increase of M/G value and the concentration of sodium-alginate. Gradually increasing the concntration of coagulation bath, it increases until the concentration is up to 5%. However, it reduces with lasting coagulating tine.展开更多
Referring to children's development,especially the development of children's language,there is a question that people are very interested in,that is,does the development of children's language on earth dep...Referring to children's development,especially the development of children's language,there is a question that people are very interested in,that is,does the development of children's language on earth depend on innate inheritance or postnatal environment? In order to answer this question,this paper begins with the definition of the development of children's language,then,expounds some theories on language acquisition,finally,finds out the crucial factors influencing the development of children's language.展开更多
基金The Research Fund for the Doctoral Program of Higher Education(No. 20061065002)The Research on Science and Technology Item of Shandong Province (No. 2006GG3205005)
文摘The M/G values of different sodium alginate were studied by means of H-NMR. The alginate fiber was prepared via wet-spinning technology. The effects of M/G, the concentration of sodium-alginate, the concentration of the coagulation bath and coagulating time on the absorptive ability of alginate fiber were discussed. The results show that the absorptive ability to different substances varies in such order： physiological saline 〉 blood 〉 tap water 〉distilled water. The absorptive ability of the alginate fiber increases with the increase of M/G value and the concentration of sodium-alginate. Gradually increasing the concntration of coagulation bath, it increases until the concentration is up to 5%. However, it reduces with lasting coagulating tine.
文摘Referring to children's development,especially the development of children's language,there is a question that people are very interested in,that is,does the development of children's language on earth depend on innate inheritance or postnatal environment? In order to answer this question,this paper begins with the definition of the development of children's language,then,expounds some theories on language acquisition,finally,finds out the crucial factors influencing the development of children's language.
