基于小波包分析的大跨桥梁结构损伤预警的理论研究

基于小波包分析推导了结构动力系统在不同分析尺度上的状态方程和观测方程,在此基础上研究了结构动力响应在不同分析尺度上的时-频特性.理论分析证明,采用小波包分解结构的动力响应得到小波包能量谱,将可以表征结构损伤的发生.在此基础上进行了小波包能量谱关于结构损伤和观测噪声的敏感性研究,分析了结构系统矩阵和测量噪声在各个分析尺度上的递推性.结果表明,采用结构动力响应的小波包能量谱进行结构损伤预警具有较好的损伤敏感性和噪声鲁棒性.     

自闭症儿童音乐智能开发培养的个案研究

本文采用个案研究方法,运用多元智能理论,对一名自闭症儿童进行音乐智能开发培养的训练,将孩子独特而敏感的音乐智能发掘出来,以弥补她在其他智能方面表现出来的缺陷,使其特长能力和艺术感觉得到充分的发展。研究表明:利用多元智能理论对自闭症孩子进行音乐智能开发培养,能够取得比较理想的效果。由此推出,对部分具有特殊艺术天赋的自闭症孩子进行专才培养,是特校艺术教师努力的一个方向。     

The Outcome of a Social Cognitive Training for Mainstream Adolescents with Social Communication Deficits in a Chinese Community

The use of cognitive-based strategies for improving social communication behaviours for individuals who have solid language and cognition is an important question. This study investigated the outcome of teaching Social Thinking^®, a framework based in social-cognition, to Chinese adolescents with social communication deficits. Thirty-nine students (33 with Autism Spectrum Disorders and six without), ranging in age from 12 to 15 years with social communication deficits, participated in a 12-week intervention. Students’ pre- and post-intervention social behaviours were measured by six aspects of the Social Thinking-ILAUGH Scale involving 115 familiar raters. Students showed significant improvement in all the six subscales of the Social Thinking-ILAUGH except humour after training. Agreements on ratings among parents and school personnel were satisfactory. A framework based in social cognitive strategies, with appropriate linguistic and cultural adaptations, appears to be a promising tool for Chinese adolescents with social learning issues. Social behaviours improved across school and home settings as noted by groups of raters familiar with the students.     

两等同双能级原子与三模腔场任意多光子共振相互作用辐射谱的一般特征

本文研究了两个偶极——偶极力关联的等同双能级原子与三模腔场间任意多光于共振相互作用的辐射谱。对三模腔场分别处于不同数态:即三模均为真空场、三模均为强场、一模为真空场两模为强场以及两模为真空场一模为强场时辐射谱的结构特征及物理特性进行了详细分析,从而揭示出“三模腔场——两原子系统”的多光子辐射谱的一般特征。     

非线性光学有机分子吸收光谱的测定及跃迁偶极矩的计算

通过测定两种具有D—π—D结构的有机分子的吸收谱,并根据三能级模型对其跃迁偶极矩进行了计算.并从结构-性质的关系对其高阶非线性光学效应进行了预测,认为这两种分子将会具有较大双光子吸收截面.     

基于调制重叠双正交变换的扩频通信非正交型窄带干扰抑制

Traditional lapped transform domain excision techniques obtain good performance at the expense of increased processing delay. Extension of transform domain filtering techniques to the lapped biorthogonal transform domain can help solve the problem. By incorporating biorthogonality into the lapped transforms, more flexibility is obtained in the design of windows. Thus transform bases with better stopband attenuation can be generated by designing windows, but not by increasing the overlapping factor. In this paper, a new modulated lapped biorthogonal transform (MLBT) with optimized windows is introduced for efficient compression of multi-tone interfering signal energy. The bit error rate (BER) performance of the receiver employing the proposed MLBT excision technique is analyzed and compared with that of the lapped transform domain excision-based receivers. Simulation results demonstrate the improved performance and increased robustness of the proposed technique.     

电视高频信号源的混合设计与应用

本文简述了电视高频信号与电视标准测试信号的混合使用，通过工程实践，分析并比较两种信号源的频谱分布结构情况，为两种信号的合理混合应用提出可行的设计方案。     

同步检波器的计算机虚拟仿真实验

以同步检波器解调DSB、SSB信号为例,提出利用电子仿真软件Multisim8.0进行计算机虚拟仿真作为高频电子线路实验的辅助手段,阐述计算机虚拟仿真的效果和结果.     

Test and Analysis of an Existing Tunnel Vibration Induced by Blasting Construction of Diaphragm Wall

According to the blasting construction of the diaphragm wall of Puxi approaching section of East Fuxing Road river-crossing tunnel, the monitoring project of the vibration of the existing tun-nel induced by the blasting construction is put forward, which includes the sensors’ location, moni-tor method and the vibration monitoring system. Based on the monitoring data of the explosion vibration, the vibration wave forms, velocities, acceleration responses, main frequencies and fields of measure points are analyzed under the conditions of three locations and different charge quanti-ties. According to the safety-judging standard of explosion vibration, the conclusion that the exist- ing tunnel is safe under the explosion vibration is then drawn. Furthermore, the spectrum character-istics of three explosion vibrations and the spectrum changing properties of explosion vi-bration wave transmitting in different directions are concluded, which can provide reference to similar projects.     

人类科学中的新极限论（I）

从新构建的基础理论学的角度,在无穷观及与之密切相关的数量体系的理论框架中讨论人类科学中长期被忽视的现有极限论的基础问题,得到“经典无穷理论体系基础理论中的本质性缺陷决定了人类不可能在经典无穷理论体系的框架中构建科学的极限论,而新无穷观和与之密切相关的新数谱的产生为极限论的体系性和基础理论奠定了新的、牢固的基础,决定了新极限论的产生”的明确结论．