期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
加快广东水产品冷藏链的发展
1
作者 范锦姬 刘彦华 +1 位作者 陈文聪 徐泽智 《制冷》 1999年第4期36-40,共5页
本文介绍了广东水产品冷藏链的概况和现状,分析了存在问题和发展趋势, 并提出了21 世纪加快广东水产品冷藏链建设的建议。
关键词 水产品 冷藏链 技术进步 生产 流通段 消费
下载PDF
深圳B股(以港元交易结算)、基金周行情表
2
《股市动态分析》 2004年第38期73-73,共1页
关键词 深圳 港元 行情表 交易 基金 结算 流通段 收益
下载PDF
最新三板交易行情数据
3
《股市动态分析》 2004年第3期90-91,共2页
关键词 行情 流通市值 成交金额 高科技农业 车用仪表 过境货运 建筑用钢材 移动平均 市盈率 流通段
下载PDF
Mapping the Risk of Water Erosion in the Watershed of the Ningxia-Inner Mongolia Reach of the Yellow River, China 被引量:3
4
作者 DU He-qiang XUE Xian WANG Tao 《Journal of Mountain Science》 SCIE CSCD 2015年第1期70-84,共15页
Mapping and assessing soil-erosion risk can address the likelihood of occurrence of erosion as well as its consequences. This in turn provides precautionary and relevant suggestions to assist in disaster reduction. Be... Mapping and assessing soil-erosion risk can address the likelihood of occurrence of erosion as well as its consequences. This in turn provides precautionary and relevant suggestions to assist in disaster reduction. Because soil erosion by water in the watershed of the Ningxia-Inner Mongolia reach of the Yellow River is closely related to silting of the upper reaches of the Yellow River, it is necessary to assess erosion risk in this watershed. This study aims to identify the soil-erosion risk caused by water in the watershed of the Ningxia-Inner Mongolia reach of the Yellow River from 2ool to aOlO. Empirical models called Chinese Soil Loss Equation (CSLE) and Modified Universal Soil Loss Equation (MUSLE) were used to predict the erosion modulus in slope surfaces and gullies. Then the soil erosion risk in this watershed was assessed according to the classification criteria of soil erosion intensities (SL19o-2oo7). The study results showed that the range of values of the erosion modulus in this watershed was o-44,733 t/km2/a. More than 20% of the total watershed area was found to present an erosion risk, with the regions at risk mainly located in channels and their upper reaches, and in mountainous areas. To determine the regression coefficients of the erosion factors with respect to erosion modulus, a GWR (geographically weighted regression) was carried out using the ArcGIS software. It was found that the topographic factor has the highest contribution rate to the soil erosion modulus, while the highest contribution rate of the erosion factors to the erosion modulus and the largest values of the factors were not located in the same places. Based on this result, the authors propose that slope management is the most important task in preventing soil loss in this watershed, and the soil- conservation projects should be built according to the eontribution rate of the erosion factors. 展开更多
关键词 Chinese Soil Loss Equation (CSLE) Erosion risk Geographically weighted regression(GWR) Yellow River
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部