纳米蒙脱土对环氧胶粘剂的改性机理及应用研究

采用经十六烷基季铵盐改性的纳米蒙脱土(OMMT)对环氧树脂(EP)进行改性,制备了OMMT/EP复合胶粘剂。通过对改性胶粘剂的黏度、粘接强度、冲击韧性、热失重分析表明,当OMMT质量分数为6%时,胶粘剂的改性效果最好,XRD分析表明此时OMMT与EP形成了剥离型复合结构,SEM分析表明,当OMMT含量不同时,增韧改性机理也不相同,质量分数4%时主要是裂纹钉铆和银纹-微裂纹增韧机理,质量分数6%时主要是多层次的应力分散增韧,质量分数8%时则未起到改性效果。     

Zernike-moment-based image super resolution

Multiframe super-resolution (SR) reconstruction aims to produce a high-resolution (HR) image using a set of low-resolution (LR) images. In the process of reconstruction, fuzzy registration usually plays a critical role. It mainly focuses on the correlation between pixels of the candidate and the reference images to reconstruct each pixel by averaging all its neighboring pixels. Therefore, the fuzzy-registration-based SR performs well and has been widely applied in practice. However, if some objects appear or disappear among LR images or different angle rotations exist among them, the correlation between corresponding pixels becomes weak. Thus, it will be difficult to use LR images effectively in the process of SR reconstruction. Moreover, if the LR images are noised, the reconstruction quality will be affected seriously. To address or at least reduce these problems, this paper presents a novel SR method based on the Zernike moment, to make the most of possible details in each LR image for high-quality SR reconstruction. Experimental results show that the proposed method outperforms existing methods in terms of robustness and visual effects.     

重载货运列车自动驾驶控制技术研究

传统的重载铁路货物运输主要采用人工控车为主,司机控车难度大、工作强度高。为进一步提升线路运量、节约成本、降低司机工作强度,文章提出了一种融合线路、信号的重载货运列车自动驾驶控制方法,其基于列车多质点动力学模型、阻力模型与空气制动模型,研究了基于实际线路信息、信号信息与列车信息等多约束条件下的目标曲线动态规划与控制技术;采用本文所提方法在西康线铁路进行了货运列车自动驾驶试验,成功完成了包含零速起车、加速控制、减速控制、贯通试验、过分相、停车到零等各个运行场景的全程自动驾驶。试验结果表明,本文所提方法可以有效实现货运列车自动驾驶。     

天山北坡典型草地净初级生产力对氮沉降及气候变化的响应阈值研究

生态阈值现象普遍存在于自然系统中.气候变化幅度过大,超出了生态系统本身的调节和修复能力,生态系统的结构功能就会遭到破坏.新疆干旱区气候波动明显,该区草地生态系统对大气氮沉降和气候变化的响应是否存在阈值,有待深入研究.本文以天山北坡沿海拔梯度分布的四种草地类型(高山草甸(AM)、中山森林草地(MMFM)、低山干草原(LM...