MAPGIS二次开发在化探元素异常提取中的应用

地球化学元素的异常下限值确定在矿产勘查中非常重要,本文在MAPGIS二次开发的基础之上采用非线性算法分形含量面积来圈定地球化学元素异常,可以使地球化学空间信息数据和图形进行快捷地转换。其中,通过分形含量面积来确定的异常下限与传统方法对比,得到的异常下限值更加精确。同时,通过MAPGIS二次开发使地球化学元素异常圈定更加自动化和智能化。本文以湖北省铜绿山铜铁矿为例,取得了较好的效果。     

多层前向神经网络的新型二阶学习算法

提出了多层前向神经网络的新型二阶递推学习算法。该算法不仅能使用网络各层误差而且使二阶导数信息因子反向传播。证明了新算法等价于Ｎｅｗｔｏｎ迭代法并且有二阶收敛速度。它实现了Ｎｅｗｔｏｎ搜索方向和Ｈｅｓｓｉａｎ阵逆的递推运算,其计算量几乎与普通递推最小二乘法相当。由算法性能分析证明新算法优于Ｋａｒａｙｉａｎｎｉｓ等人的二阶学习算法。     

柘林大坝第二溢洪道泄洪运行安全分析

柘林大坝第二溢洪道泄洪闸结构稳定,位移和渗流运行性态正常,泄流能力满足原设计要求。但尾渠内人口稠密、房屋林立,一旦泄洪,如何保障尾渠内的人民生命财产安全是本工程泄洪运行需要重点关注的问题。因此,电厂必须与地方政府联动,制定出切实可行的防洪抢险应急预案,警钟长鸣、定期演练,以能在泄洪非常时期把损失降到最低。     

溪洛渡水电站空调系统节能性分析

对金沙江溪洛渡水电站的空调系统进行了节能性分析,即：该空调系统利用江水获取冷量,通过组合式空调进行一级表冷、二级表冷,并与制冷机组冷凝器进行热交换,来满足整个厂房的冷负荷。与传统的冷却塔散热方式相比较,该空调系统突出了利用江水进行散热节能的优点。     

二次受力CFRP布加固混凝土矩形柱抗压强度计算方法研究

在一次受力下CFRP布加固混凝土矩形柱抗压强度理论公式的基础上,按照叠加原理和强度代换原理推导了二次受力下CFRP布加固混凝土矩形柱抗压强度理论公式,并采用ANSYS软件对CFRP布加固混凝土柱的二次受力性能进行了数值模拟,将试验值与理论值及ANSYS值进行对比,结果基本吻合,证明了理论推导的科学性,为加固工程提供了一定的理论参考．     

Design and compensation of second-order sub-sampling digital frontend

The problem of designing a digital frontend (DFE) was considered which can dynamically access or sense dual bands in any radio frequency (RF) regions without requiring hardware changes. In particular, second-order bandpass sampling (BPS) as a technique that enables to realize the multiband reception function was discussed. In a second-order BPS system, digital reconstruction filters were utilized to eliminate the interferences generated while down converting arbitrarily positioned RF-band signals by using the direct digitization method. However, the inaccuracy in the phase shift or the amplitude mismatch between the two sample streams may cause insufficient rejection of interference. Practical problems were studied, such as performance degradation in signal-to-interference ratio (SIR) and compensation methods to overcome them. In order to demonstrate the second-order BPS as a flexible DFE suitable for software-defined radio (SDR) or cognitive radio (CR), a DFE testbed with a reconfigurable structure was implemented. Moreover, with a view to further demonstrate the proposed compensation algorithms, experimental results show that dual bands are received simultaneously.     

独立学院外语专业第二外语课程改革研究——以城建学院日语专业第二外语英语教学为例

本文在教学实践基础上,针对独立学院外语专业第二外语教学进行研究,并从教学目标、教材、教学方法等方面总结出适用于独立学院第二外语教学的改进措施,为第二外语教学提供相关参考.     

Combining the wavelet and second order total generalized variation for the image zooming algorithm

A new image zooming model combining the wavelet and second order total generalized variation is proposed. The original image is regarded as the wavelet low-frequency band for the zoomed image, and the high-frequency bands are estimated. Further processing is implemented for the zoomed image using the second order total generalized variation. The second order total generalized variation may lead to an absence of the staircase effect and keep most details, and therefore, the high quality image is reconstructed. Finally, experimental results have illustrated that our algorithm not only can achieve better zooming but also can produce a very satisfactory denoising effect.     

高职学生实践创新能力现状调查与分析——以沙洲职业工学院为例

高职学生实践创新能力的培养不仅仅局限于单一的实践能力或操作能力的培养,而是包括动手操作、表达、质疑、思维等各种能力在内的综合能力的培养。以沙洲职业工学院为例,通过问卷调查的形式,分析目前高职学生在实践创新能力培养方面存在的缺失,提出了主要对策。