基于小波变换的数字图像水印算法

利用小波变换多分辨率特性和人眼视觉特征,提出了一种彩色图像多水印算法.多个有意义的签名水印能提供更可靠的版权识别,而且多水印相互配合使水印图像同时具有很好的鲁棒性.为增强水印的鲁棒性,在添加水印之前对水印进行预处理,在嵌入水印时又应用了扩频技术.实验结果表明,该算法取得了良好的效果.     

基于VI的多通道FFT频谱分析仪的设计

提出一种基于虚拟仪器技术的多通道FFT频谱分析仪设计方案,分析虚拟仪器技术在频谱分析仪设计上的主要流程。给出设计的频谱分析仪组成框图和各模块需要完成的功能实现。重点分析传感器模块、采集模块和嵌入式系统等三个关键模块实现原理与设计优化。最后对仪器的总体性能进行测试与分析。结果证明该方案简单实用,具有较高的性价比。     

基于阵列波导光栅的可调谐多波长掺镱光纤激光器的研究

根据镱离子特性理论分析了掺镱光纤激光器的原理,借助阵列波导光栅、光谱分析仪等构建出相应装置对多波长掺镱光纤激光器24个不同的输入信道/输出光谱强度分别进行详细研究,证实了可调谐多波长掺镱光纤激光器稳定的工作特性。     

IBM对偶-偶核低激发态的描述

探讨IBM(相互作用玻色子模型)对偶-偶核低激发态能谱和电磁跃迁的描述。     

通讯扩频序列混合并行捕获预检测积分时间和判决门限最优设计

论文以低轨卫星信道为例，给出一种适用于大频偏条件下突发通信系统直接扩频序列混合并行捕获结构，分析了预检测积分时间和判决门限对平均捕获时间的影响，提出了在门限信噪比下以平均捕获时间最小为原则的预检测积分时间和判决门限参数最优设置方案。     

（H3O）2［Co（C2N2H8）3］2［W7O24］结构和振动光谱的实验和理论研究

采用水热法合成了新化合物（ H3O）2[ Co（ C 2N 2H 8）3]2[ W 7O 24],对其结构进行了红外光谱和X射线单晶衍射测定。通过密度泛函理论,对其红外光谱进行了计算,对吸收峰的振动模式进行了指认。结果显示,（H3O ）2[Co （C2N2H8）3]2[W7O24]的红外光谱对溶剂十分敏感。     

2n阶J-自伴算子的谱是离散的充分条件

借助Naimark关于2n阶对称微分算式所生成最小算子L0之任何自伴扩张Lu的谱是离散的充分条件定理，利用Lidskii方法，得到了2n阶J-自伴微分算子的谱是离散的另一个充分条件．     

The use of visual schedules and work systems to increase the on‐task behaviour of students on the autism spectrum in mainstream classrooms

Apparent differences in executive function can lead to challenges for students on the autism spectrum in mainstream settings. Difficulties with staying on‐task and transitioning between tasks and task elements can interfere with students’ participation in educational activities and lead to stress and anxiety. While the use of visual supports, such as visual schedules and work systems, has been shown to be effective in supporting students to stay on‐task in special education and autism‐specific settings, there is little research to support the use of these strategies by teachers in mainstream classrooms. This study evaluated the use of visual schedules and work systems in supporting four students on the autism spectrum to stay on‐task and work independently in a mainstream setting. These strategies were implemented by teachers as inclusive practices, and evaluated using observations within the natural classroom environment to examine their feasibility in mainstream settings. All participants demonstrated improvements in on‐task behaviours. Results for other, secondary, dependent variables were mixed, with some students showing reduced off‐task behaviours and increased productivity. The implications for clinical practice and future research directions are discussed.     

色关联单模激光线性模型瞬态的随机共振

(襄樊学院 物理学系,湖北 襄樊 441053) 计算了具有指数关联形式的两白噪声驱动下,单模激光线性模型受信号调制后瞬态的输出信噪比,发现了瞬态的随机共振现象. 讨论了噪声间互关联时间及信号频率对信噪比的影响     

Hilbert空间上正算子的下确界

利用算子矩阵分块技巧,研究了Hilbert空间H上的任意两个正算子A和B的下确界问题,给出了A与正交投影P的下确界A∧P存在的谱刻画及A∧B存在的充要条件,从而推广了一些已有的结论.