全文获取类型
收费全文 | 125篇 |
免费 | 2篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 5篇 |
环保管理 | 24篇 |
综合类 | 38篇 |
基础理论 | 15篇 |
环境理论 | 1篇 |
污染及防治 | 26篇 |
评价与监测 | 5篇 |
社会与环境 | 7篇 |
灾害及防治 | 4篇 |
出版年
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2018年 | 8篇 |
2017年 | 4篇 |
2016年 | 2篇 |
2015年 | 2篇 |
2014年 | 4篇 |
2013年 | 7篇 |
2012年 | 3篇 |
2011年 | 7篇 |
2010年 | 4篇 |
2009年 | 5篇 |
2008年 | 4篇 |
2007年 | 5篇 |
2006年 | 1篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 3篇 |
2002年 | 12篇 |
2000年 | 2篇 |
1996年 | 5篇 |
1995年 | 3篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1989年 | 1篇 |
1983年 | 4篇 |
1981年 | 2篇 |
1980年 | 4篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1963年 | 1篇 |
1962年 | 1篇 |
1955年 | 1篇 |
1954年 | 1篇 |
1949年 | 1篇 |
1946年 | 1篇 |
1932年 | 1篇 |
1931年 | 1篇 |
1930年 | 3篇 |
1928年 | 1篇 |
1926年 | 3篇 |
1925年 | 1篇 |
1913年 | 1篇 |
排序方式: 共有127条查询结果,搜索用时 31 毫秒
91.
Chester T. Wezernak Fabian C. Polayn 《Journal of the American Water Resources Association》1970,6(6):920-934
Large scale water resource investigations and effective pollution surveillance programs require the development of additional instrumentation and techniques to supplement existing methods of data acquisition. As a result, interest is growing in the concept of remote sensing. Described in this paper is the multispectral sensor concept and its application in water resource studies. 相似文献
92.
93.
Baumgarten M Werner H Häberle KH Emberson LD Fabian P Matyssek R 《Environmental pollution (Barking, Essex : 1987)》2000,109(3):431-442
Mature beech trees (Fagus sylvatica) grown at two different altitudes in the Bavarian forest were compared with young beech trees grown at nearby field sites or in phytotrons for their macroscopic and physiological responses to different ozone (O(3)) exposures. Cumulative O(3) exposure expressed as the sum of hourly mean concentrations above the canopy ranged between 100 and 150 microl l(-1) h, with the vertical O(3) profiles at the higher altitude site being enhanced by 30%. O(3) profiles at all sites were reduced by up to 20% with increasing depth within and beneath the canopy. The leaf discoloration that developed in the absence of premature leaf loss was similar in the sun foliage of mature and young trees (including plant grown in the phytotron). Injury became apparent at low O(3) exposures, expressed as accumulated hourly means over a threshold of 40 nl l(-1) (AOT40 <3.5 microl l(-1) h) at the lower site in both the mature trees and the young beech at the field site, but only occurred when AOT40 values reached 7 microl l(-1) h at the upper site, and 6 microl l(-1) h in the phytotrons. However, the association between injury and O(3) exposure was improved when cumulative ozone uptake to sun leaves was the ozone index, used with values of about 3 mmol m(-2) resulting in visible injury in both mature and young beech growing in phytotrons. Under high ozone exposure levels of inositol were lowered, whilst concentrations of lignin-like materials were enhanced in mature beech. Similar responses were observed in young beech grown in phytotrons. As the sun foliage was affected by only a small and variable extent each year, the seasonal O(3) impact at high altitude did not appear to pose an acute risk to mature beech trees. 相似文献
94.
Dr Iris Bartels Barbara Hoppe-Sievert Barbara Bockel Sabine Herold Julius Caesar 《黑龙江环境通报》1993,13(2):123-130
Serum levels of alpha-fetoprotein (AFP), human chorionic gonadotropin (hCG), and un-conjugated oestriol (uE3) were measured in serum samples of 4131 non-smoking and 1018 smoking women during the second trimester of pregnancy. The levels of all three analytes decreased with increasing body weight. The AFP median was significantly increased in smokers in a dose-response association; hCG decreased by 21 per cent and uE3 decreased by 3 per cent in smokers in a non-dose-related fashion. Regression functions for adjustment of serum levels for weight and smoking should be considered in risk estimation for Down syndrome in order to give a woman's individual risk more precisely. 相似文献
95.
96.
Hakan Berg Julius Francis Petra Souter 《Ambio-人类环境杂志》2002,31(7):597-601
西印度洋(WIO)地区以其迷人的海岸带、丰富的海洋生物多样性以及富饶的海洋和海岸带资源而著称.但是地处WIO地区的许多国家像肯尼亚、莫桑比克、索马里、南非、坦桑尼亚、科摩罗、马达加斯加、毛里求斯、留尼旺、塞舌尔等却极度贫困,特别是近二三十年以来,该地区的环境退化现象以及自然资源和生物多样性的下降越来越明显. 相似文献
97.
98.
99.
100.
West Jordan M. Courtney Catherine A. Hamilton Anna T. Parker Britt A. Julius Susan H. Hoffman Jennie Koltes Karen H. MacGowan Petra 《Environmental management》2017,59(1):102-117
Environmental Management - The interactive and cumulative impacts of climate change on natural resources such as coral reefs present numerous challenges for conservation planning and management.... 相似文献