排序方式: 共有57条查询结果,搜索用时 15 毫秒
1.
2.
3.
通过添加不同形态的有机硅憎水剂来提高脱硫石膏的耐水性,研究有机硅乳液(A液)和有机硅粉末(G粉)对脱硫石膏浆体密度、力学强度、耐水性能的影响,并通过微观分析手段(SEM)分析了憎水剂对脱硫石膏晶体形貌的影响.结果表明,A液和G粉具有引气和稳泡功能,能够降低脱硫石膏的浆体密度.随掺量的增加,A液使脱硫石膏硬化体的强度逐渐降低,而G粉使脱硫石膏的抗折、抗压强度呈先提高后降低趋势.A液、G粉皆能大幅度提高脱硫石膏的耐水性、降低质量吸水率.有机硅憎水剂能够改变脱硫石膏硬化体的晶体形貌,尤其G粉能够提高晶体的结晶度,使硬化结晶体相互搭接、交织和穿插,并呈无定向排序,结构更加致密. 相似文献
4.
5.
通过粗粒度分子动力学模拟的方法研究了水杨酸钠(Na Sal)对聚丙烯酰胺(PAM)与表面活性剂十二烷基三甲基溴化铵(DTAB)复合体系自组装行为的影响。结果表明,随着添加的Na Sal浓度增大,DTAB/PAM聚集体经历了球形-棒状-球形的结构变化,且吸附到聚合物链上的DTAB分子数目先增大后减小。在DTAB/PAM聚集体中,聚合物PAM分子链位于DTAB胶束疏水内核与亲水层的交界处,有机盐Sal-插入到胶束内部。聚合物分子链的回转半径(Rg)随时间的变化以及聚集体中表面活性剂数目随时间的变化过程均可以分为3个阶段,且形成尺寸较大的DTAB/PAM聚集体需要更长的时间。 相似文献
6.
After the computer became a tool for data sharing and information exchange, the unified computer font has made the text lose the diversity and discreteness of handwriting. Text is the crucial factor for the spread of culture and civilization. Many electronic books have lost the characteristic fonts with cultural background and historical significance in the original ancient books after the digitalization. One example is the sculpted typeface with diversity and discreteness that can be called a Tibetan culture. In order to solve this problem, a research method of digitizing engraving fonts in ancient Tibetan books is proposed. Firstly, the projection method and the connected domain method are used to segment the ancient book image. Secondly, the GIST feature algorithm is used to realize the image text recognition. Thirdly, the SIFT feature algorithm is used to implement the image font style classification, and diffe rent styles of carved fonts in the ancient books are obtained. A font diversity expression algorithm is proposed to realize the diversity and discreteness of carved fonts in ancient books. The purpose of the research is to achieve the inheritance and protection of engraving fonts, which has important cultural research and inheritance significance. 相似文献
7.
8.
腰果是引起人们过敏的主要食物之一。作者采用生物信息学方法,通过Pubmed网络服务器、生物信息分析软件SOPMA、swiss-model网络服务器、DNAStar生物分析软件等对腰果主要过敏原Ana o 2的结构和抗原表位进行预测,分析Ana o 2蛋白的抗原表位可能是108-111,181-186,217-218,234-238,244-255,283-287。这为腰果过敏原的进一步研究提供理论参考,并对开发低过敏腰果制品提供帮助。 相似文献
10.