全文获取类型
收费全文 | 20855篇 |
免费 | 1271篇 |
国内免费 | 2551篇 |
专业分类
安全科学 | 2729篇 |
废物处理 | 348篇 |
环保管理 | 3777篇 |
综合类 | 11238篇 |
基础理论 | 1719篇 |
环境理论 | 27篇 |
污染及防治 | 1350篇 |
评价与监测 | 1343篇 |
社会与环境 | 1285篇 |
灾害及防治 | 861篇 |
出版年
2024年 | 61篇 |
2023年 | 272篇 |
2022年 | 488篇 |
2021年 | 669篇 |
2020年 | 776篇 |
2019年 | 528篇 |
2018年 | 452篇 |
2017年 | 668篇 |
2016年 | 771篇 |
2015年 | 762篇 |
2014年 | 923篇 |
2013年 | 1158篇 |
2012年 | 1257篇 |
2011年 | 1509篇 |
2010年 | 998篇 |
2009年 | 1213篇 |
2008年 | 908篇 |
2007年 | 1321篇 |
2006年 | 1314篇 |
2005年 | 1090篇 |
2004年 | 1003篇 |
2003年 | 983篇 |
2002年 | 878篇 |
2001年 | 766篇 |
2000年 | 740篇 |
1999年 | 685篇 |
1998年 | 493篇 |
1997年 | 430篇 |
1996年 | 274篇 |
1995年 | 244篇 |
1994年 | 228篇 |
1993年 | 213篇 |
1992年 | 140篇 |
1991年 | 83篇 |
1990年 | 51篇 |
1989年 | 37篇 |
1988年 | 38篇 |
1987年 | 24篇 |
1986年 | 25篇 |
1985年 | 29篇 |
1984年 | 32篇 |
1983年 | 20篇 |
1982年 | 18篇 |
1981年 | 15篇 |
1980年 | 19篇 |
1979年 | 14篇 |
1978年 | 15篇 |
1977年 | 9篇 |
1973年 | 7篇 |
1971年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
乌鲁木齐市汽车尾气排污现状及防治对策探讨 总被引:1,自引:0,他引:1
对乌鲁木齐市在用车辆进行了路抽检调查,通过大量数据分析,得出乌鲁木齐市目前汽车尾气排放情况仍令人担忧,治理工作不容忽视。 相似文献
82.
83.
A ten year summary of concurrent ambient water column and sediment toxicity tests in the Chesapeake Bay watershed: 1990-1999 总被引:1,自引:0,他引:1
The goal of this study was to identify the relative toxicity ofambient areas in the Chesapeake Bay watershed by using a suiteof concurrent water column and sediment toxicity tests at seventy-five ambient stations in 20 Chesapeake Bay rivers from1990 through 1999. Spatial and temporal variability was examinedat selected locations throughout the 10 yr study. Inorganicand organic contaminants were evaluated in ambient water andsediment concurrently with water column and sediment tests toassess possible causes of toxicity although absolute causalitycan not be established. Multivariate statistical analysis wasused to develop a multiple endpoint toxicity index (TOX-INDEX) at each station for both water column and sediment toxicity data. Water column tests from the 10 yr testing period showed that49% of the time, some degree of toxicity was reported. The mosttoxic sites based on water column results were located inurbanized areas such as the Anacostia River, Elizabeth River andthe Middle River. Water quality criteria for copper, lead,mercury, nickel and zinc were exceeded at one or more of thesesites. Water column toxicity was also reported in localizedareas of the South and Chester Rivers. Both spatial and temporalvariability was reported from the suite of water column toxicitytests. Some degree of sediment toxicity was reported from 62% of the tests conducted during the ten year period. The ElizabethRiver and Baltimore Harbor stations were reported as the most toxic areas based on sediment results.Sediment toxicity guidelines were exceeded for one or more of thefollowing metals at these two locations: arsenic, cadmium,chromium, copper, lead, nickel and zinc. At the Elizabeth Riverstations nine of sixteen semi-volatile organics and two of sevenpesticides measured exceeded the ER-M values in 1990. Ambientsediment toxicity tests in the Elizabeth River in 1996 showedreduced toxicity. Various semi-volatile organics exceeded the ER-M values at a number of Baltimore Harbor sites; pyrene anddibenzo(a,h)anthracene were particularly high at one of thestations (Northwest Harbor). Localized sediment toxicity was alsoreported in the Chester, James, Magothy, Rappahannock, andPotomac Rivers but the link with contaminants was not determined.Both spatial and temporal variability was less for sedimenttoxicity data when compared with water column toxicity data. Acomparison of water column and sediment toxicity data for thevarious stations over the 10 yr study showed that approximatelyhalf the time agreement occurred (either both suite of testsshowed toxicity or neither suite of tests showed toxicity). 相似文献
84.
We propose a modelling framework for the design of a Pigouvian effluent tax, in an environmental management problem implicating
several economic agents located in a river basin. The proposed charging system allows for the agents' geographical position
relative to the river's sections, at which environmental standards are to be enforced, and takes into account the possible
different market structures within which the agents are operating. In particular, we consider industrial agents competing
on an oligopolistic market, and a set of farmers acting as price takers on a large market. A regional authority's goal is
to induce agents to some sort of cooperation which would result in the satisfaction of the common environmental constraints.
The economic process on one side, and the pollution transport and accumulation on the other, constitute two dynamic processes
in two different time scales. As the economic process is much slower than the other process we can neglect the latter's transients
and concentrate on the time invariant steady state solutions to the transportation equation. The model thus constructed has
some noncooperative game and optimal control problem's features with space being the ‘running’ variable.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
85.
工作场所空气中硫酸雾(SO3)的分析 总被引:1,自引:0,他引:1
王连弟 《环境监测管理与技术》1997,9(3):36-37
采用碘量法测定工作场所空气中的三氧化硫及硫酸雾,三氧化硫及硫酸雾经中性水吸收后与碘化钾和碘酸钾反应,析出的碘与淀粉指示剂作用产生蓝色,进行比色测定。 相似文献
86.
将有时序多目标决策方法应用于地面水环境质量优势的比较,介绍了决策方法的原理和评价步骤。实例分析表明该方法计算过程简便,分辨率高,排序结果与实际环境质量状况相符合。 相似文献
87.
酸性法测定高锰酸盐指数加热时间的选择 总被引:1,自引:0,他引:1
张美萍 《环境监测管理与技术》1997,9(1):38-38
酸性法测定高锰酸盐指数,会因实验条件的差异产生不同的结果。对不同加热时间,加热方式等因素进行了试验,结果表明加热时间以水浴加热沸腾30min或电炉直接加热8min为宜。 相似文献
88.
通过对2014—2016年湖体水质中氮素质量浓度分析,结合出入湖总氮浓度、水量、湖体水生生态等影响因素,发现太湖水体中总氮浓度呈现逐年下降的趋势,各监测点位总氮为0.530 mg/L~5.51 mg/L,时空分布不均,差异明显。时间上,总氮浓度表现为春季最高,夏季和秋季最低,且月均值变化曲线呈现出规律的正弦函数波形。空间上,总氮浓度大致表现出由西部湖区向东部湖区递减的趋势,呈现西部湖区﹥北部湖区﹥南部湖区﹥湖心区﹥东部湖区。要改善湖体水质,不仅要切断污染源,而且要加强水生生态功能修复。 相似文献
89.
关于模糊数学在环境质量综合评判中“最大隶属度”原则不适用性的讨论 总被引:3,自引:0,他引:3
通过对模糊数学在环境质量综合评判中的分析,指出“最大隶属度”原则的不适用性,并根据环境质量分级所存在的固有关系提出改进的方法。 相似文献
90.
环境样品中痕量锰的催化动力学测定法 总被引:2,自引:0,他引:2
对环境样品中痕量锰的催化动力学测定方法进行简要评述,引述文献16篇。 相似文献