前馈神经网络隐性单调与泛化能力

应用前馈人工神经网络对广域单调的两组样本进行了模拟反演，引入单调前馈网络的概念对其权值和阈值定解问题和泛化能力进行了较诉研究。表明前馈人工神经网络是一个表达形式简单的复杂系统，其单调特征是隐性的，而且训练网络的成熟性对样本数量和样本内在规律性有一定依赖。强调了前馈人工神经网络的应用效果，指出单调与复合问题还需进一步深入研究。     

三维相干切片断层多边形检测

作者在本文中将三维切片视为二维图像，利用图像边缘检测技术，检测出相干切片上断层多边形，并将其直接投影到测网底图上，用于构造成图。该项技术不仅提高了用相干切片解释断层的精度，而且提高了断层解释效率，使相干数据体技术在三维解释中的作用得到更大的发挥。实际应用表明，三维相干切片断层多边形检测技术，是全三维高精度解释的有力工具，提高了解释效率，缩短了解释周期。     

叠前正演模拟与偏移的网络并行计算

在叠前深度偏移和非零炮检距声波方程正演计算过程中包含了大量的可并行计算的成分。作者在本文中提出叠前正演模拟与偏移的网络并行计算算法，并基于TCP／IP协议，将该算法设计成网络并行处理程序，极大地提高了计算效率。实际运算结果证明，本文提出的并行算法和技术路线是切实可行的。     

郯庐断裂带中南段新生代玄武岩源区地幔特征及其演化

郯庐断裂带中南段新生代玄武岩随时代逐渐变新 ,碱性逐渐增强 ,轻、重稀土元素分离程度及不相容元素的富集程度也逐渐增强 ,Sr、Nd同位素组成越来越亏损。古地温线特征表明 ,断裂带之下的上地幔具有高的大地热流值。老第三纪拉斑玄武岩地幔源区主要以轻微富集的EMⅠ组分为主 ,新第三纪以来的碱性玄武岩来源于亏损地幔。研究区地幔源区随时间的演化受老第三纪软流圈上涌的影响 ,大量的深源流体对上部岩石圈地幔进行广泛的交代 ,从而使郯庐断裂带下面的岩石圈地幔出现不相容元素和LREE富集 ,且由轻微富集地幔转变为亏损地幔。     

青海省河南M_S5.1和玛沁M_S5.0地震后库玛断裂带的地震活动趋势研究

根据地震活动特征、大武地震台尾波持续时间及长宁、湟源和西宁 3个台水氡异常变化 ,讨论了 1 999年河南MS5 .1和玛沁MS5 .0地震发生后库玛断裂带的地震活动趋势 .结果表明 ,河南—玛沁地区的中强地震活动与库玛断裂带上的强震活动有明显的对应关系 ;在库玛断裂带中东段存在一个由ML ≥ 3.0地震围成的空区 ;上述2次地震发生后大武地震台尾波持续时间异常依然存在 ,长宁、湟源和西宁台水氡趋势异常仍然持续 .据此认为库玛断裂带存在发生强震的背景     

Carbon and strontium isotope variations and responses to sea-level fluctuations in the Ordovician of the Tarim Basin

In the Ordovician, a carbonate platform system grading from the platformal interior eastwards to basin was developed in the Tazhong area of the Tarim Basin, and the study column is located in the place where the paleoslope occurred. The isotope compositions of the carbonates there are thus considered as having reflected those of simultaneous sea waters in view of its good connection with the open seas. The carbon and strontium isotope compositions of the Ordovician carbonates in the Tazhong area are analyzed, and their relationships to the sea-level fluctuations are discussed as well. Studies have revealed that the carbon isotope composition is related positively with the sea-level fluctuations, whereas an opposing situation occurs to the strontium isotope variation. Similar responses of carbon and strontium isotope compositions to the sea-level fluctuations are reported elsewhere in the world, suggesting that the Ordovician sea-level fluctuations of the Tarim Basin were of eustatic implication.     

Research on the seismotectonics of the Jan－uary 17，1995 Hanshin M7．2 earthquake

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伊乐藻,轮叶黑藻净化养鱼污水效果试验

在实验室条件下.对伊乐藻及轮叶黑藻净化养鱼污水的能力进行了比较研究。结果表明:(1)伊乐藻和轮叶黑藻对养鱼污水中的N、P等物质有较好的净化效果。在96h内,它们对TN、TP、PO_4~(3-)-P、NH_4~+-N、NO_3~--N、COD_(Mn)的平均净化率分别为:60.7％,53.6％.74.4％.59.7％,75.1％,63.2％;61.8％,54.2％.85.3％,81.8％,31.4％,33.5％。(2)水生植物在净化过程中,其效率受温度、光照、及水体中营养盐浓度等外界条件的制约。(3)微生物在水生植物净化养鱼污水的过程中起着重要的作用。     

伊乐藻—草鱼圈养复合生态系统中水生生物的变化和影响

从细菌、浮游植物、浮游动物、底栖动物和有机碎屑等几个方面分析了养鱼对伊乐藻种植区(以下简称为有草区)和无草区水域环境的影响。结果表明:两个区域存在着显著的差异性。有草区由于生长着茂密的水生植被,对环境压迫的缓冲能力增强,水生生物的群落结构较为稳定,物种多样性指数高于无草区,有机物的沉降速率也大大低于无草区。与此相比,无草区对环境压迫的缓冲能力较差,水体浮游植物数量增加,富营养化加剧。通过本项实验可以看出,人工种植伊乐藻对养鱼区水质有着明显地控制作用,是发展生态渔业的一条有效途径。     

TRANSPORT OF THE SUSPENDED SEDIMENT IN THE CHANGJIANG ESTUARY

The Changjiang River is characterized by the enormous volume of runoff and the great amount of sediment load with remarkable seasonal variation. The annual runoff sometimes is respondent to the amount of sediment load, and sometimes not. The amount of monthly sediment load after the month of the maximum runoff is larger than those before the month. The sediment concentration and net quantity of sediment transport in the vicinity of the river mouth varies greatly in time between the ebb and flood, spring and neap, and dry seasons and flood seasons. The three bifurcations also have differences in concentration and net quantity in space. Even in the same bifurcation they have differences in and out of the sand bar. At present, the North Channel is the main passage for water and sediment load emptying into the sea from the Changjiang River. More than 50 percent of the sediments from the river basin are deposited nearby the South Branch entrance and the main depositional area is situated in subaqueous delta off the South Channel. Between 122°30'E and 123°E is an important boundary for eastward sediment dispersion from which the suspended sediment are dispersed towards the east by south.