The variation character of seismic velocity ratio in source region and field area before and after zhangbei Ms6.2 earthquake;
张北6.2级地震前后地震波速比在源区与场区的变化特征
In this paper,the reason of producing singularity has been introduced in great detail when solving the electric field in the source region and avoiding the difficulty,including vector function method,reducing space dimension method,principal volume method,coordinate transforming integral method.
介绍了在源区电场求解时产生奇异性的原因以及解决这一困难的几种方法 。
In this paper, by analyzing the progress solving inside a current-carrying region under distribution source model, the conclusion is that the singularity solving the source region is due to the exchange of the derivative operator and the integration operator.
本文通过对源区电场求解过程的分析，指出了产生源区电场求解的奇异性是由于不适当的微、积分算子交换次序所形成的。
On the ecological environment status in the source area of Yangtze River and Yellow River and its control countermeasure;
试论长江、黄河源区生态环境现状及其防治对策
Distribution of footprint and flux source area of the mixed forest of broad-leaved and Korean pine in Changbai Mountain;
长白山阔叶红松林通量观测的footprint及源区分布
Distribution, chemical characteristics and source area of volcanic glass in the South China Sea;
南海火山玻璃的分布特征、化学成分及源区探讨
Geochemistry of Quaternary basaltic volcanic rocks of Weizhou island in Beihai City of Guangxi and a discussion on characteristics of their source;
广西北海涠洲岛(含斜阳岛)第四纪玄武质火山岩的地球化学性质及其源区特征
05, indicating that the source of Jinan gabbro intrusion is enriched-mantle and have a heterogeneous characteristic.
济南辉长岩体的Rb Sr全岩 矿物参考等时线年龄为 144± 2 5Ma ,线性差的原因可能是该岩体来自于锶、钕同位素初始比值不均一的源区 ,结晶时处于同位素不平衡状态。
Identification of critical source areas: an efficient way for agricultural non-point source pollution control;
关键源区识别:农业非点源污染控制方法
Because of the big difficulties,identifying the critical source areas for phosphorus loss becomes the focal point of the non-point sources pollution control.
农业非点源磷污染是我国农村水环境面临的严重污染问题,由于非点源污染治理难度大,所以识别流域内磷流失的关键源区成为非点源污染控制的重点。
The primary issue of efficiently controlling and managing agricultural nonpoint source pollution is how to identify critical source areas or the sensitive regions of pollutants loss from agricultural lands.
在农业非点源污染研究中 ,确定农业非点源污染的关键源区或危险区域是开展有针对性研究和控制农业非点源污染的首要问题之一。
Assessment of ecosystem integrity in headwaters of Yangtze River;
长江源区生态系统完整性测量与评价