ICI elimination of M-band wavelet multi-carrier modulation system

To solve the inter carrier interference （ICI） elimination problem of an M-band wavelet multi-carrier modulation system, this paper analyzes the principle of the ICI caused by the Doppler frequency shift and its mathematical expression based on the M-band wavelet multi-carrier modulation system model. Through the analysis of the mathematical expression and combining with the perfect reconstruction conditions of the filter banks, we propose the design conditions of an M-band filter to reduce and eliminate the ICI. The impulse response model of the filter design conditions and an iterative algorithm is also established. The simulation results show that the proposed ICI reduction and elimination methods can effectively improve the system performance.     

汉英散文翻译中显性与隐性逻辑连接的转换

逻辑连接是语篇衔接的重要手段,汉英篇章使用的连接词不同,汉语以隐性连接为主,英语呈显性。翻译中处理显隐性翻译的转换是翻译研究的热点之一。在对比汉英散文中逻辑连接的基础上,对其在汉英翻译中的隐性向显性的转换进行了分析思考,考察实际中的处理方法。     

A video structural similarity quality metric based on a joint spatial-temporal visual attention model

Objective video quality assessment plays a very important role in multimedia signal processing. Several extensions of the structural similarity （SSIM） index could not predict the quality of the video sequence effectively. In this paper we propose a structural similarity quality metric for videos based on a spatial-temporal visual attention model. This model acquires the motion attended region and the distortion attended region by computing the motion features and the distortion contrast. It mimics the visual attention shifting between the two attended regions and takes the burst of error into account by introducing the non-linear weighting fimctions to give a much higher weighting factor to the extremely damaged frames. The proposed metric based on the model renders the final object quality rating of the whole video sequence and is validated using the 50 Hz video sequences of Video Quality Experts Group Phase I test database.     

汉英交际中的文化迁移

文化迁移有文化信息的增殖等三种模式,在汉英交际中文化迁移存在着不适当的社会应酬语等三种现象,这种现象是由汉英两种文化的不同价值观和规约习俗所造成的。要十分注重汉英交际中的文化迁移,以减少语言交际中的障碍。     

芳环上取代基定位效应的研究

通过苯环上芳氢化学位移的变化,判断苯环上取代基的定位效应及苯环亲电取代反应的强弱.     

赵树理研究的“喧器”与“沉寂”

昔日辉煌的赵树理方向与今日赵树理研究界的相对冷清同样是令人关注的文学现象。本文试图从时代背景、评论介入、创作心理及读者群的转换几个方面去分析赵树理的创作“命运”，并在此基础上体验赵树理创作的本真状态。     

对称三对角矩阵的QL方法论

QL(QR) method is an efficient method to find eigenvalues of a matrix. Especially we use QL(QR) method to find eigenvalues of a symmetric tridiagonal matrix. In this case it only costs O( n^2) flops, to find all eigenvalues. So it is one of the most efficient method for symmetric tridiagonal matrices. Many experts have researched it. Even the method is mature, it still has many problems need to be researched. We put forward five problems here. They are: (1) Convergence and convergence rate; (2) The convergence of diagonal elements; (3) Shift designed to produce the eigenvalues in monotone order; (4) QL algorithm with multi-shift; (5) Error bound. We intoduce our works on these problems, some of them were published and some are new.     

通过注重数学学习迁移提高学生学习能力

学习过程中的迁移现象是普遍存在的。在数学教学中,教师应创造条件促进学生学习的正迁移,有意培养学生的迁移能力,这样就能有效提高数学教学效率。     

智能农机动力系统作业工况匹配与换挡优化

利用车辆经济性与动力性软件CRUISE,根据FJ1004 智能无人驾驶拖拉机的动力传动系统搭建了整车模型,通过柴油机的特性曲线分析匹配动力特性,依据工况特征加载拖挂特性,模拟机具消耗。通过工况仿真分析了拖拉机整车的动力性与经济性,与实验数据对比分析,最高车速误差为-0.76%;犁耕油耗和旋耕油耗误差分别为-1.2%和-1.3%。最后通过分析柴油AMT 拖拉机工作特性,结合MIGA 算法对换挡策略进行优化,确定最优功率和燃油经济性的换挡规律,在田间转移工况下油耗优化9.21%;在保证需求动力性的轻负载作业工况下油耗优化1.28%。为后续自适应工况换挡策略提供参考与优化方向。     

现代性价值位移与现代人的道德困境

现代人的生存样式和道德心态的变化造成了现代性价值的位移，这一位移意味着启蒙运动所奠定的理性主义价值的颠覆，从而深刻地影响了现代人的伦理生活，现代伦理从日常生活的价值的共挈性伦理转变为主观性的相对性伦理，从禁欲型、克制型伦理转变成享乐型和惬意型伦理；从精神品质型、理想型道德转变成规则型、约束型的肉身感觉性道德。从禁欲主义的内修式道德转向了纵欲与享乐的浪漫主义道德；从爱邻人的道德转向了怨恨的道德；从奋发的道德转向了精神颓废的道德。价值的位移伴随着“上帝死后”的终极价值的坍塌、德性品质的移变和道德秩序的解体；这些都表现了现代人的价值承缺失落之后的道德困境和教化悖论。