全文获取类型
收费全文 | 13002篇 |
免费 | 1310篇 |
国内免费 | 4221篇 |
专业分类
安全科学 | 1342篇 |
废物处理 | 570篇 |
环保管理 | 1074篇 |
综合类 | 8480篇 |
基础理论 | 2066篇 |
环境理论 | 1篇 |
污染及防治 | 2714篇 |
评价与监测 | 842篇 |
社会与环境 | 942篇 |
灾害及防治 | 502篇 |
出版年
2024年 | 67篇 |
2023年 | 267篇 |
2022年 | 783篇 |
2021年 | 779篇 |
2020年 | 793篇 |
2019年 | 578篇 |
2018年 | 608篇 |
2017年 | 697篇 |
2016年 | 680篇 |
2015年 | 823篇 |
2014年 | 968篇 |
2013年 | 1222篇 |
2012年 | 1122篇 |
2011年 | 1142篇 |
2010年 | 1008篇 |
2009年 | 975篇 |
2008年 | 968篇 |
2007年 | 797篇 |
2006年 | 788篇 |
2005年 | 528篇 |
2004年 | 403篇 |
2003年 | 396篇 |
2002年 | 361篇 |
2001年 | 321篇 |
2000年 | 319篇 |
1999年 | 209篇 |
1998年 | 209篇 |
1997年 | 142篇 |
1996年 | 128篇 |
1995年 | 89篇 |
1994年 | 75篇 |
1993年 | 69篇 |
1992年 | 54篇 |
1991年 | 35篇 |
1990年 | 33篇 |
1989年 | 21篇 |
1988年 | 18篇 |
1987年 | 5篇 |
1986年 | 8篇 |
1985年 | 2篇 |
1984年 | 7篇 |
1983年 | 6篇 |
1982年 | 9篇 |
1981年 | 2篇 |
1978年 | 6篇 |
1975年 | 2篇 |
1972年 | 3篇 |
1971年 | 2篇 |
1970年 | 1篇 |
1923年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
71.
Yu. A. Anokhin 《Environmental monitoring and assessment》1988,11(3):315-325
The global cycles of man-produced pollutants entering the natural environment are reflected in changes of pollutant cycles, even in background regions.The system of mathematical balance simulation models of inorganic pollutant distribution and circulation (some heavy metals and pesticides included in the priority list for integrated background monitoring) has been developed for the Lake Baikal drainage basin. The system consists of the following units: (1) inventory and classification of regional sources of pollutants entering the atmosphere, natural waters and soils; (2) computation of the global atmospheric transfer and depositions; (3) regional spreading with atmospheric fluxes and deposition onto the underlying surfaces; (4) transport with waterflows feeding Lake Baikal; (5) transport with the lake currents and balance in the lake.The models developed have enabled improvement of existing programmes and systems of observations, in particular to substantiate the large-scale snow sampling and analysis network, and to develop the programme of integrated surveys of the state of Lake Baikal. Since 1981 these actions have been included in the operational network observations within the Lake Baikal Monitoring System. 相似文献
72.
73.
74.
Yu.M. Svirezhev W. von Bloh H.-J. Schellnhuber 《Environmental Modeling and Assessment》1999,4(4):287-294
A novel approach to the problem of estimating climate impact on social systems is suggested. This approach is based on a risk concept, where the notion of critical events is introduced and the probability of such events is estimated. The estimation considers both the inherent stochasticity of climatic processes and the artificial stochasticity of climate predictions due to scientific uncertainties. The method is worked out in some detail for the regional problem of crop production and the risks associated with global climate change, and illustrated by a case study (Kursk region of the FSU). In order to get local climatic characteristics (weather), a so-called statistical weather generator is used. One interesting finding is that the 3% risk level remains constant up to 1.0–1.1°C rise of mean seasonal temperature, if the variance does not change. On the other hand, the risk grows rapidly with increasing variance (even if the mean temperature rises very slowly). The risk approach is able to separate two problems: (i) assessment of global change impact, and (ii) decision making. The main task for the scientific community is to provide the politicians with different options; the choice of admissible (from the social point of view) critical events and the corresponding risk levels is the business of decision makers. 相似文献
75.
用StrandenE.推荐的测量方法对哈密地区环境空气中220Rn子体α潜能浓度测量结果表明,室内、外平均值分别为56.1和10.2(×10-7J·m-3)。室内外220Rn/222Rn子体α潜能浓度比值分别为0.84和032。220Rn子体所致居民有效剂量当量为228μSv·a-1(集体有效剂量当量为0.9×02man·Sv)。 相似文献
76.
16 priority polycyclic aromatic hydrocarbons (PAHs) were determined in water samples from the Jinsha River (Panzhihua part), Southwest China. Total dissolved PAH concentrations varied from 21.89 microg l(-1) to 382.8 microg l(-1). It was found that the concentration of PAHs decreased along the flow direction due to the higher density distribution of coal chemical industry in the upstream of our study rivers. The pollution levels in our study area are significantly higher than previously reported values in other waters both in China and other countries. The predominance of benzo[k]fluoranthene and indeno[1,2,3-cd]pyrene was clearly observed in all water samples. On average these two compounds accounted for 98.3% of the total dissolved PAH concentration in water. The results showed the positive correlations among total dissolved PAHs, benzo[k]fluoranthene and indeno[1,2,3-cd]pyrene, which suggested that these two predominant PAHs have similar source and environmental behaviors in our study area. When compared with the survey results of organic micropollutants two decades ago, it was found that hydrocarbon pollution both predominated and even increased with the development of coal chemical industry in this area during the past 20 years. The results therefore provide important information on the current contamination status of a key industrial city in China, and points to the need for urgent action to investigate the relationship between the PAH composition and concentration in water from the Jinsha River and the wastewater discharge from coal chemical industry, and to identify the source, transport pathway and fate of PAHs in the area. It should then be necessary to adopt appropriate and instant measures to control the pollution around this area. 相似文献
77.
赵玉萍 《环境监测管理与技术》2002,14(2):10-11
简述了小型餐饮服务业的特点,指出排污申报登记制度落实难、废水中各污染物排放量核定难及申报登记表设计欠合理是小型餐饮服务业在排污申报登记中存在的主要问题。提出,应加大宣传力度,进一步提高餐饮服务业业主以及广大公民的环保意识;制定较合理的排污量核算系数,修订申报内容;实行《排污申报登记注册证》制度,强化执法力度,以促进小型餐饮服务业全面实施排污申报登记制度。 相似文献
78.
本文对防震减灾文化的组成、创建动力及其方法进行了探讨.初次提出了防震减灾文化的概念,并对创建防震减灾文化的目的和如何创建、弘扬防震减灾文化提出了看法和观点. 相似文献
79.
陆炳情 《防灾技术高等专科学校学报》2006,8(2):3-6
本文对防震减灾文化的组成、创建动力及其方法进行了探讨。初次提出了防震减灾文化的概念,并对创建防震减灾文化的目的和如何创建、弘扬防震减灾文化提出了看法和观点。 相似文献
80.
环境影响评价中河流调查、监测方法的探讨 总被引:1,自引:0,他引:1
根据实际工作的经验,对中小河流水环境研究中的河段选择、断面布设、测量采样、污染源调查、化验分析等几个方面进行初步探讨分析。 相似文献