准实时微机图像处理系统的设计与实现

本文介绍了实时微机图像处理系统的结构与功能。该系统采用了一种数字信号处理器TMS320C25对图像信号进行处理。还讨论了为实现高质量图像处理的一些关键技术。     

Inversion of the Strain Accumulation State in Crustal Interior from Observations of Earth Tide Tilts

The strain accumulation state in crustal interior and its migration trend can be inverted from observational data of earth tide tilts.In China,large earthquakes frequently occur in the border area between Yunnan and Sichuan Provinces.Using the observational data for years from 7 stations in this area,γ(the amplitude factor of earth tide tilts)values that characterize the strain accumulation state in crustal interior have been inverted in this paper.It has been found out that,Ms>5 events in the area often occur when γreaches an anomaly value.Using the time-space collocational stereomodelling the migration trend of strain accumulation can be determined to make a prediction for the probable location of a forthcoming earthquake in the area.     

中强震前单台地震波振幅比异常特征

通过对乌鲁木齐、石场和库尔勒地震台十几年来地震波振幅比的系统追踪研究，发现在中强地震前，振幅比无论是在空间分布还是在时间进程上都显示出比较明显的异常变化特征。研究结果表明，当监测范围内的孕震介质发生变化时，单台地震波振幅比可以反映出介质的异常变化过程，该方法具有一定的预报效能。     

多级BP神经网络石油测井信号分类器

本文提出了一种利用多级ＢＰ神经网络进行石油测井信号分类的新方法．介绍了用多级ＢＰ网络处理测井信号的分类器算法和网络结构，并给出了针对理论模拟信号的分类结果及针对实际模型井信号的分类结果，其正确率可达９０％以上．     

Eigendecomposition of TDR waveforms: a novel method to determine water content and pore fluid concentration of sandy soils

In this study, an incident pulse signal of several harmonics (i.e., multiples of the fundamental frequency) was used as a source in the time domain reflectometry (TDR) probing technique. Reflected signals were captured by an oscilloscope and their characteristics were determined via eigendecomposition. Autoregressive modeling and singular value decomposition were used to calculate the eigenvalues and the most significant ones were identified based on power spectrum. A multivariate statistical analysis was performed for the two most dominant eigenvalues, which are dependent on water content and salt concentrations, and regression equations were obtained. To determine the water content and salt concentrations in terms of the first and second eigenvalues, a modified Powell hybrid algorithm was used to solve the obtained system of nonlinear equations. Actual and predicted results are in agreement indicating that the developed method is very successful in predicting water content and salt concentrations. Furthermore, on comparing the eigendecomposition method with Fourier spectral analysis, one can observe that the former is superior in predicting water content and salt concentrations.     

相关检测在甚低频电磁信号检测中的应用

介绍了在甚低频电磁接收机研制中如何利用有关软件以相关检测方法来检测甚低频电磁信号的幅度信息，并给出了理论和实际的检测结果。     

A study on the duration and amplitude characteristics of earthquake ground motions

The duration, total power, rms amplitude, and peak ground acceleration (PGA) are examined using the data from the KiK-net digital borehole accelerograph arrays in Japan during three large earthquakes. We investigate correlations between the duration, PGA on the surface and hypocentral distance, instrumental seismic intensity, and the local site conditions. Also considered in this paper, are correlation between the duration and PGA. This present study suggests that PGA is inversely proportional to the duration.Comparing the duration, total power, rms amplitude, and PGA on the surface with those at the bottom of borehole, the duration and maximum amplitude characteristics of earthquake ground motions are investigated with emphasis on site amplification due to the local site conditions. The difference of amplification factors is not only site-dependent but also event-dependent. The comparison of the site amplification factors and the average shear-wave velocity in the upper 30-m showed a good agreement.This paper indicated that the duration and amplitude characteristics suffer a reciprocal effect due to the local site conditions and the site dependency of maximum amplitude PGA is greater than that of the duration. In view of the results, the duration is not less important than the maximum amplitude and frequency content in earthquake engineering. Moreover, this study provided meaningful information of input motion available to earthquake-resistant design.     

强振幅地震属性分析技术在车排子地区油气检测中的应用

准噶尔盆地西缘车排子地区是目前中石化的有利探区,P2井的突破,加速了该区油气勘探的步伐.为了提高勘探的经济效益,用地震特殊处理手段对有利目标进行预测就显得非常重要和迫切.本文运用强振幅属性分析技术有效地预测了该区的有利目标区,并经实钻证实.强振幅属性分析技术是目前车排子地区油气检测的有效手段.     

γ射线康普顿背散射扫描仪测量的信噪比研究

本文详细给出了ＣＢＳ测量中噪声的物理来源和降低噪声的有效措施,还对信噪比进行了定量的分析和讨论。     

乌恰7.4级地震的震磁信息

本文采用差值、相关分析、谐波分析等方法处理了1985年8月23日新疆乌恰7.4级地震前的地磁观测资料,发现喀什地磁台存在3—4个月的中短期异常,但与国内某些大震震例相比,异常幅度偏小。文章对此作了初步讨论。