沉降监测多项式回归分析与神经网络预测

使用多项式和切比雪夫(Tchebyshev)多项式分别对沉降监测数据进行回归分析以预测未来沉降值,其中切比雪夫多项式的外推效果较好;应用前向BP神经网络对两种不同的单因子输入模式进行非线性函数逼近,并进行了不同采样步长的比较,实例表明将时间点作为网络的输入对沉降进行预测效果较好。     

黄河口及其邻近海域大型底栖动物的初步研究——(二)生物与沉积环境的关系

1985年5—6月对黄河口及其邻近海域的27个站进行了大型底栖动物的首航次定量调查。分别对18种环境因子和68个优势种和习见种所做的聚类分析显示了黄河口水下三角洲与邻近海域的某些差异,并联系沉积环境将所研究海域划分为四个区:黄河口水下三角洲、莱州湾、渤海中部和渤海湾东部。对大型底栖动物与沉积速率的关系也做了初步探讨。     

用切比雪夫多项式标准化GPS卫星轨道

根据精密星历提供的等时间间隔点上的卫星坐标,采用切比雪夫多项式拟合的方法,选用达到精度要求的最佳拟合多项式阶数,对GPS卫星轨道进行标准化,从中得出:选用不同的多项式阶数直接影响到拟合的精度。     

Abrupt climate change and transient climates during the Paleogene: a marine perspective

Detailed investigations of high latitude sequences recently collected by the Ocean Drilling Program (ODP) indicate that periods of rapid climate change often culminated in brief transient climates, with more extreme conditions than subsequent long term climates. Two examples of such events have been identified in the Paleogene; the first in latest Paleocene time in the middle of a warming trend that began several million years earlier: the second in earliest Oligocene time near the end of a Middle Eocene to Late Oligocene global cooling trend. Superimposed on the earlier event was a sudden and extreme warming of both high latitude sea surface and deep ocean waters. Imbedded in the latter transition was an abrupt decline in high latitude temperatures and the brief appearance of a full size continental ice-sheet on Antarctica. In both cases the climate extremes were not stable, lasting for less than a few hundred thousand years, indicating a temporary or transient climate state. Geochemical and sedimentological evidence suggest that both Paleogene climate events were accompanied by reorganizations in ocean circulation, and major perturbations in marine productivity and the global carbon cycle. The Paleocene-Eocene thermal maximum was marked by reduced oceanic turnover and decreases in global delta 13C and in marine productivity, while the Early Oligocene glacial maximum was accompanied by intensification of deep ocean circulation and elevated delta 13C and productivity. It has been suggested that sudden changes in climate and/or ocean circulation might occur as a result of gradual forcing as certain physical thresholds are exceeded. We investigate the possibility that sudden reorganizations in ocean and/or atmosphere circulation during these abrupt transitions generated short-term positive feedbacks that briefly sustained these transient climatic states.     

含矿预测的人工神经网络方法

运用神经网络模型的一典型模型——“反向传播”模型的改进形式,处理矿产资源统计预测问题,得出与数量化理论Ⅱ处理极为相似的结果.     

地图的网络化应用

一、前言 在Internet互联网普及盛行的今天，各种信息流在网络上传播蔓延，给人们的同常工作、生活带来了更加丰富的、便捷的服务。而地图作为人们日常生活中不可缺少的工具，也应该在网络上更加普及，被广泛应用。地图在网络中的最大应用是WebGIS，而WebGIS是一个具有强大而又复杂分析功能的信息系统。在大多数时候，人们在互联网上并不需要太多的分析决策，只需要一些简单的观察查找功能。为了让地图在网络上更加快捷、不失版权地传播信息，目前，可利用的格式主要是Flash格式（＊．swf）和SVG格式（＊．svg）。     

东营市月降水量与大气环流特征量的相关分析及预报

通过对东营市月降水量与大气环流特征量的相关分析 ,得到了与各月降水量相关显著的环流特征量。以这些特征量为因子制作月降水量预报 ,效果良好。