RIVER PATTERNS AND SPATIAL AND TEMPORAL TRANSFORMATION MODES

1 INTRODUCTIONThe river pattCths and transfo~ion of the pattenes are of great significance for flood control andmanagement of navigation system. Vallous spatial and temporal modes have been reported in theprevious stUdies. These modes depend on certain controlling factors and occur with different frequencies.These factors are related to modem fluvial processes and ancient sedimentary consequences. T'hedifferent river patterns, depending on the factors, can be either observed in nature or…     

一种气象卫星云图的坐标转换与配准方法研究

设计了气象卫星云图坐标转换与范围截取的算法,并基于ArcEngine组件实现了卫星云图的自动配准。实验证明,本文提出的方法可以快速有效地实现卫星云图的位置校正以及与基础地理数据的准确叠加,减少分析过程中的误差,提高气象卫星云图的使用效率,对天气监测及分析预报等工作提供了及时、有效、科学的辅助决策支持。     

钢筋混凝土梁结构断裂损伤诊断方法

提出一种基于BP神经网络的结构破损诊断方法,该方法以结构破损前后柔度的变化作为破损诊断网络输入,为了解决由于系统响应样本数据空间分布不均匀对网络收敛速度及网络诊断影响问题,对网络训练样本采用广义空间格点进行了交换,模拟算例及应用实例均表明,本文方法能准确诊断结构破损位置与破坏程度,是一种有效的结构破损诊断方法.     

The wave transformation and breaking phenomena in shallow water

Ｔｈｅｗａｖｅｔｒａｎｓｆｏｒｍａｔｉｏｎａｎｄｂｒｅａｋｉｎｇｐｈｅｎｏｍｅｎａｉｎｓｈａｌｌｏｗｗａｔｅｒ￥ＬｉＹｕｃｈｅｎｇ（１．ＤａｌｉａｎＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｎｏｌｏｇｙ，Ｄａｌｉａｎ１１６０２３，Ｃｈｉｎａ）Ａｂｓｔｒａｃｔ：...     

对流层氮氧化物光化学转化特征研究

应用大气光化学模式研究了日间影响NOx光化学转化率的主要物理化学因子.探讨了在不同NMHC/NOx比值时,NOx光化学特征及其转化产物的变化规律.结果表明,影响NOx转化率的主要因子是阳光辐射强度和NMHC/NOx比值.但在NMHC/NOx比值很低时,光强的增加并不能显著提高NOx转化率.温度和初始臭氧浓度对NOx转化率的影响次之.相对湿度对NOx转化率的影响较小.在不同NMHC/NOx比值下,NOx转化特征和产物有很大区别.NMHC/NOx比值高时,产物中PAN＞HNO3.NMHC/NOx比值中(低)时,产物主要是HNO3,PAN等有机氮不到10%(1%).最后初步比较了模拟和观测的NOy组成.     

基于 MATLAB 的坐标转换方法研究

利用MATLAB强大矩阵计算功能,精确地计算不同坐标系之间的转换参数,实现不同坐标系之间的坐标快速转换。实践结果表明,该方法使用方便,结果准确,转换精度高,可满足不同坐标转换精度需求。     

Evaluation of a Model for Predicting Simultaneous Contrast on Color Maps

Perceptions of colors of individual map symbols are affected by simultaneous contrast, or induction, from surrounding colors. In an experiment with human subjects, reaction times were significantly slower, with significantly more errors, for test maps on which an induction model predicted that colors would be misinterpreted. Reaction times and error rates improved significantly with map color adjustments that the model predicted would remove induced confusions. These results represent progress toward establishing objective guidance for the design of effective color schemes in computer-assisted mapping environments common in cartography, geographic information systems, and scientific visualization.     

top-hat变换与庐枞矿集区大地电磁强干扰分离

作为一种非线性信号处理方法,基于数学形态学的广义形态滤波已经展现出其在大地电磁时间域信号去噪中的作用;然而,广义形态滤波在滤除大地电磁时间域信号中噪声波形的同时,也滤除了时间域信号中包含有用信息的缓变化。针对这一问题,提出一种基于数学形态学top-hat变换的大地电磁时间域噪声压制方案,利用top-hat变换对波峰和波谷的检测能力,采用直线型结构元素,对大地电磁时间域信号进行去噪。用该方法对庐枞矿集区大地电磁实测数据进行处理后,数据的标准差与曲线相似性参数都优于处理前数据,表明所提方法能够去除噪声波形并保留时间域信号的缓变化,恢复受噪声污染的大地电磁时间域信号,提高大地电磁视电阻率曲线的质量。     

һ���ɵ���ֱ�����굽��������ֱ��ת��

?????????????????????????ι??????????????????????????????γ?????е?4?η???,???????????????γ??????????4?η?????????????????Ч?????????е????????????????????     

The Solid-liquid Transformation of Low-grade Solid Potash Deposit in Dalangtan Basin and the Simplification of the Liquid Phase System

正We studied the solid-liquid transformation of low-grade solid potash deposit in Dalangtan Basin and simplified the liquid phase system.We did experiments to optimize conditions of the solid-liquid transformation.The Suitable