可生物降解淀粉/PCL共混物性能研究

本文研究了土豆淀粉与聚己内酯(PCL)共混型可完全生物降解材料的性能,结果表明:改性淀粉共混体系的力学性能比未改性者有显著提高。吸水性试验表明,共混体系的吸水率随PCL用量的增加而降低,偶联剂改性共混物的吸水率也有所下降。土埋生物降解试验表明,共混体系有着良好的生物降解性能。同时还考察其在活性污泥中的降解性。红外光谱测试显示,共混体系具有较好相容性和降解性能。     

基于IGWO-RBF的LTE-R切换算法研究

针对高速铁路LTE-R越区切换中,A3事件下的越区切换算法容易出现乒乓效应（PPE）和无线链路连接失败（WLF）的问题,提出了粒子群优化（PSO）灰狼算法改进的RBF神经网络（IGWO-RBF）的越区切换优化算法。该算法采集大量列车以不同速度（0~100 m/s）运行在特定环境中时切换成功率高的切换迟滞门限[(Hys)]和触发延迟时间[(TTT)]参数集,送入改进的RBF神经网络,训练完成后得到不同速度下的[Hys]和[TTT]的拟合曲线。根据列车接收到的参考信号接收质量（RSRQ）,加入自矫正项对[Hys]和[TTT]进行二次优化调整。在matlab上进行仿真实验,结果表明提出的算法减小了掉话率和乒乓切换率,提高了列车在高速环境下的切换成功率及鲁棒性。     

DSP控制的3kW非隔离型并网逆变器研究

提出了一种基于DSP控制的非隔离型并网逆变器的实现方案。介绍了该并网逆变器结构及原理,给出了基于DSP控制的硬件和软件的总体设计,实现了基于电压扰动观察与控制的最大功率点跟踪(MPPT)和无差拍控制的并网控制策略,并测试了其孤岛保护,完成了3 kW的实验样机及相关实验,对实验波形的分析证明了该控制策略和方案的有效性。     

Superhydrophobic and magnetic PS/Fe3O4 sponge for remote oil removal under magnetic driven,continuous oil collection,and oil/water emulsion separation

Journal of Materials Science - Superhydrophobic and magnetic materials with multiple functions (e.g., continuous oil collection, remote oil removal in confined spaces under magnetic driven,...     

Determination method of the cavern boundary viscosity in a stirred tank with pseudoplastic fluid

It is essential to predict the cavern boundary accurately for investigating the cavern characteristics and achieving efficient mixing of the pseudoplastic fluids. The distribution characteristics of apparent viscosity of xanthan gum solutions at different mass concentrations stirred by the impeller of perturbed six-bent-bladed turbine (6PBT impeller) were numerically investigated through the computational fluid dynamics (CFD) simulation based on laminar flow model. The determination method of the cavern boundary viscosity was presented, and the predicted results were compared with those of traditional velocity method. Results showed that the data of the power consumption predicted using CFD simulation agreed well with those measured by torque experiment, which validated the laminar flow model. The η_a − γ curve changes from nearly horizontal straight line to the power function curve along the direction of center axis toward tank wall. As a result, the location of the transitional point can be determined as the cavern boundary, and the corresponding viscosity is the cavern boundary viscosity. The ratio of the cavern boundary viscosity and the fluid yield viscosity ( η_a/η_y ) always remains approximately constant, that is, at different speeds. Compared with the traditional velocity method, the boundary viscosity method can maintain its high accuracy for exhibiting the cavern boundary, and the predicted cavern size and development are always in good agreement with the CFD results free from the speed and the impeller type. So this work can provide a new way for accurately characterizing the cavern boundary.     

上海地区由CPT确定钻孔灌注桩承载力的分项系数研究

利用随机场理论和可靠度理论 ,研究了获得钻孔灌注桩Ps、fi、Psb统计特性的统计原则 ,对相关距离、桩截面尺寸、端阻力计算范围等在程序编制中的协调问题进行了研究 ,并对上海地区 17个场地的 46条CPT曲线进行了电算 ,进而求出了由CPT确定钻孔灌注桩极限承载力的可靠度指标的统计特性。在此基础上 ,利用完全可靠性分析方法求出了上海地区由CPT确定钻孔灌注桩承载力的分项系数     

预制桩竖向承载力的分项系数研究

考虑荷载规范给定的分项系数约束条件下 ,对上海地区预制桩桩基竖向承载力 3种确定方法进行了可靠性分析 ,并推导出对应于各方法的抗力分项系数的理论公式。     

思维导图与记忆法在教学型普通高校《建筑材料》课中的运用

《建筑材料》课程比较枯燥,知识点繁杂,学生较难掌握,课堂教学效果较差。为了提高教学效果,在课堂中引入思维导图和形象记忆法,研究并总结了教学经验,并通过比较前后的学生成绩和问卷调查的形式,说明了思维导图和形象记忆法在提高学生学习兴趣,提高课堂效率,培养学生的学习思考方式有很大的帮助。     

市场经济条件下应加强投资项目的敏感性分析

介绍了敏感性分析的方法及在投资决策中的应用，并以案例进行了对比分析。论述了市场经济条件下，投资项目论证应坚持科学的程序和方法，以解决不确定性问题，充分认识风险。提出了技术经济论证的决策层次属性及专家行为属性。