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Wan Mengfei Liu Zhongdong Chen Yongfu Lu Caiyuan Li Kechang Wang Fahe Wang Xiaomei Liu Boxiang 《中国海洋湖沼学报》2019,37(3):892-897
Octenylsuccinate starch ester, also called pure gum, is non-toxic and odourless modified starch which is widely used in many food fields. This study synthesized pure gum in a reaction kettle using the low molecular weight trehalose and octenyl succinic acid. An orthogonal test was carried out to find how the reaction factors affect the synthetization of octenylsuccinic acid polysaccharide ester and to optimize the reaction at single factor level. The optimal products were obtained using 1:2 of octenylsuccinic acid:alginic acid, catalysed by 0.1% p-toluenesulfonic acid catalyst for 1.5 h at 200℃ under vacuum conditions.The gained product contains up to 46% of seaweed gel monoesters. The degree of esterification of the polysaccharide is controlled by the use of the small-molecule trehalose. Compared with the traditional methods, our process can reduce raw material cost and improve emulsification stability of pure gum. These all can significantly improve the market competitiveness of pure gum products. 相似文献
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储层孔隙特征和孔隙结构是影响页岩气赋存与储集的重要因素。为评价海陆过渡相高演化煤系页岩储层性质与页岩气储集性能,应用扫描电子显微镜、高压压汞、低温N2和 CO2气体吸附、微米CT扫描、核磁共振实验方法,对沁水盆地武乡区块上古生界煤系页岩气储层孔隙微观特征和孔隙结构进行了研究。结果表明,沁水盆地武乡区块上古生界煤系页岩样品中发育多种类型微观孔隙,常见粒间孔、粒内孔和微裂缝,有机质孔几乎不发育;武乡区块煤系页岩气储层样品孔隙总孔容分布在0.021 9~0.073 5 mL/g之间,平均值为0.039 9 mL/g,总比表面积主要分布在11.94~46.83 m2/g之间,平均为29.16 m2/g,其中介孔(2~50 nm)和微孔(<2 nm)是煤系页岩气储集的主要载体。煤系页岩中的高配位数孔隙数量越多,相应的孔容和孔比表面积越大,孔隙连通性越好;在孔隙数量和总孔容相差不大的前提下,山西组煤系页岩储层孔隙结构与连通性比太原组煤系页岩稍好。 相似文献
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本文主要研究了考虑预设性能的航天器交会对接中的近距离悬停控制问题.针对追踪航天器近距离悬停控制问题,首先基于追踪航天器的姿轨耦合模型设计了线性滑模控制器实现了近距离悬停任务.在此基础上,为对系统收敛过程中系统状态的暂态性能进行约束,设计了基于预设性能的滑模控制器.同时,为减少系统状态的收敛时间,针对预设性能中的性能函数,采用了一种有限时间收敛的性能函数代替传统的性能函数,并改进了滑模控制器的结构.最后通过仿真进行验证,并对比三种控制策略,结果表明所设计的航天器交会对接预设性能滑模控制律具有理想的控制性能. 相似文献
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高温冻结砂土温度界限试验研究 总被引：1，自引：1，他引：0
由于高温冻土力学特性与融土相近,对其研究越来越多,然而迄今并没有一个广为接受的基于力学指标的明确定义。以冻结饱和标准砂为研究对象,利用三轴剪切试验和侧限压缩试验获得黏聚力、割线变形模量和压缩指数等力学指标,通过分析这些指标随温度变化的规律,试图从力学特性的角度对于高温冻结砂土给出一个明确的温度界限。研究发现,冻结砂土在-1.0℃到-0.5℃之间,黏聚力、割线变形模量和压缩指数等力学指标发生突变,因此,将-1.0℃定义为高温冻结砂土的温度界限,对涉及高温冻土的工程建设和维护具有重要的意义。 相似文献
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WAN Mengfei LIU Zhongdong CHEN Yongfu LU Caiyuan LI Kechang WANG Fahe WANG Xiaomei LIU Boxiang 《海洋湖沼学报（英文）》2019,(3):892-897
Octenylsuccinate starch ester,also called pure gum,is non-toxic and odourless modified starch which is widely used in many food fields.This study synthesized pure gum in a reaction kettle using the low molecular weight trehalose and octenyl succinic acid.An orthogonal test was carried out to find how the reaction factors aff ect the synthetization of octenylsuccinic acid polysaccharide ester and to optimize the reaction at single factor level.The optimal products were obtained using 1:2 of octenylsuccinic acid:alginic acid,catalysed by 0.1% p-toluenesulfonic acid catalyst for 1.5h at 200℃ under vacuum conditions.The gained product contains up to 46%of seaweed gel monoesters.The degree of esterification of the polysaccharide is controlled by the use of the small-molecule trehalose.Compared with the traditional methods,our process can reduce raw material cost and improve emulsification stability of pure gum.These all can significantly improve the market competitiveness of pure gum products. 相似文献
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GPS隧道平面控制测量中若干问题研究 总被引：1，自引：0，他引：1
分析了 GPS用于隧道平面控制测量时 ,进洞方向和横向贯通误差受垂线偏差影响的规律 ,得出了消除或减弱垂线偏差影响的 3种有效方法 ;给出了新的 GPS数据处理的步骤和方法 ;同时提出了一种有效利用野外观测数据来获取可靠的单点定位解 相似文献
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