全文获取类型
收费全文 | 619篇 |
免费 | 33篇 |
国内免费 | 264篇 |
专业分类
安全科学 | 29篇 |
废物处理 | 45篇 |
环保管理 | 46篇 |
综合类 | 372篇 |
基础理论 | 120篇 |
环境理论 | 1篇 |
污染及防治 | 215篇 |
评价与监测 | 34篇 |
社会与环境 | 31篇 |
灾害及防治 | 23篇 |
出版年
2024年 | 1篇 |
2023年 | 10篇 |
2022年 | 33篇 |
2021年 | 28篇 |
2020年 | 14篇 |
2019年 | 26篇 |
2018年 | 23篇 |
2017年 | 27篇 |
2016年 | 29篇 |
2015年 | 26篇 |
2014年 | 46篇 |
2013年 | 58篇 |
2012年 | 48篇 |
2011年 | 49篇 |
2010年 | 42篇 |
2009年 | 41篇 |
2008年 | 47篇 |
2007年 | 36篇 |
2006年 | 47篇 |
2005年 | 26篇 |
2004年 | 24篇 |
2003年 | 29篇 |
2002年 | 38篇 |
2001年 | 19篇 |
2000年 | 30篇 |
1999年 | 22篇 |
1998年 | 18篇 |
1997年 | 17篇 |
1996年 | 16篇 |
1995年 | 10篇 |
1994年 | 14篇 |
1993年 | 7篇 |
1992年 | 4篇 |
1991年 | 5篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有916条查询结果,搜索用时 568 毫秒
651.
回灌对垃圾填埋初期渗滤液化学需氧量的影响 总被引:4,自引:0,他引:4
通过模拟柱实验 ,研究了回灌对垃圾填埋场初期渗滤液 CODCr的影响。研究结果表明 ,模拟降雨雨水的渗入且无渗滤液回灌的参照柱 ,其渗滤液出水 CODCr最高 ,一般在 70 0 0 0 mg/L 左右 ;模拟渗滤液原液回灌 ,从第 4周起因脂肪酸的积累导致渗滤液的 p H低于 6,从而抑制了微生物的生化反应 ;模拟好氧生物处理后渗滤液的回灌 ,能加速垃圾层 CODCr的溶出和甲烷化阶段的建立 ,且此时渗滤液的 CODCr变化规律符合指数方程 ;当垃圾层建立甲烷化阶段后 ,回灌 CODCr在 2 0 0 0 0 m g/L 左右的渗滤液 ,仍可促使垃圾中有机物迅速转化为气态物 相似文献
652.
653.
Mei Shi Xiao Wang Mengying Shao Lun Lu Habib Ullah Hao Zheng Fengmin Li 《Frontiers of Environmental Science & Engineering》2023,17(1):5
654.
655.
Prolonged persulfate activation by UV irradiation of green rust for the degradation of organic pollutants 总被引:1,自引:0,他引:1
Chen Yiqun Gao Shuxian Liu Zizheng Shao Senlin Yin Weizhao Fang Zheng Huang Li-Zhi 《Environmental Chemistry Letters》2019,17(2):1017-1021
Environmental Chemistry Letters - Metal-activated persulfate is an efficient reagent for the oxidative degradation of organic contaminants. However, homogenous catalytic activation of persulfate... 相似文献
656.
全氟化合物污染现状及风险评估的研究进展 总被引:3,自引:0,他引:3
全氟化合物(polyfluorinated compounds,PFCs)是近年来受到广泛关注的一类新型持久性有机污染物。PFCs因具有优良的化学稳定性、耐热性以及高表面活性,而被广泛应用于生活消费和工业生产等领域。PFCs具有难降解、生物富集和长距离迁移等特点,已在大气、土壤和水体等环境介质及生物体中检出。在生态环境中,PFCs能够通过食物链不断传递放大,其具有的多种毒性效应已对生态系统和人类造成了一定的威胁。本文主要综述了PFCs在各类环境介质的污染现状、生物的毒性效应、人类摄入健康风险评估以及PFCs的降解研究,以期为未来PFCs的研究提供参考。 相似文献
657.
离子选择性微电极(ISME)是一种电化学传感器。在单细胞检测中可用来测定细胞内各种离子的浓度和胞外空间的离子流。本文提出了一种离子选择性微电极用于单细胞检测的新方法,即用离子选择性微电极测量植物细胞原生质体破裂时形成的离子浓度脉冲信号,进而分析细胞液中离子浓度的分布。并用此方法研究了在低温、纳米氧化铜(CuO NPs)、重金属(铽、镉)和乙醇等不同因素作用下,芦荟(Aloe vera)细胞原生质体的细胞液中Ca~(2+)的浓度分布。实验结果表明,在冷冻、CuO NPs、硝酸铽和氯化镉处理后细胞液中的Ca~(2+)浓度分布发生分层现象,而乙醇处理则不会出现这种现象。这种方法具有抗干扰能力强和操作简便的优点,为更全面地揭示细胞对外界刺激的响应特征提供了新的视角,也可为各种环境和生态毒理学评价提供新的途径。 相似文献
658.
A total of six nuclear reactors installed in three power plants, two along the northern and one along the southern coasts of Taiwan, started their operations one after another since October 1977. Owing to the large quantities of cooling water intake into and discharge from the plants, some environmental factors such as water temperature, chlorine, environmental radioactivity and nearshore currents may be significantly changed. Variations of these abiotic environmental factors may influence the biological activities in the ecosystem, particularly doing some kinds of damage to marine biological resources. Therefore, the possible environmental impact upon the biological systems including the fishery resources along the northern and southern coasts of Taiwan should be studied before and during the plant operation. We have started the long-term programmes of biological, chemical and hydro-graphical surveys of the nuclear power plant sites on both northern (since July 1974) and southern (since July 1979) coasts of Taiwan. the survey items include ocean currents, physical and chemical properties of sea water, primary productivity, specific compositions and interspecific relationships among phyto- and zooplankton, algae, invertebrates, corals, and fishes; and radionuclides in water and biological specimens, and fishery statistics. in general, except for a few events, the operations of the six units of nuclear power plants have not produced detectable effects on the marine ecosystem. Radio activity levels and radionuclides in water and the biological specimens remained the same as background levels throughout the survey period. However, the events of coral bleaching and fish body anomalies caused by thermal discharges were observed respectively along the outlets of third and second Nuclear Power Plants. the purposes of this paper are to report and evaluate these two events during the operations of nuclear power plants in Taiwan. 相似文献
659.
SUMMARY Arid and semi-arid environments undergo periodic seasonal agricultural droughts of varying extents and duration, erratic and ineffective rainfall of high intensity and short duration, with high surface runoff. High efficiency water-harvesting agriculture has been routinely used in the Loess Plateau agricultural production of China over the past 10 years. Localized habitat effect and regional water resource enrichment are the theoretical basis of high efficient water-harvesting agriculture. Features of this agricultural system are described, including: water harvesting of surface runoff from roads and collection in concrete yards on plastic sheets; water storage cellar tanks for harvesting runoff to provide life-saving/critical irrigation, with devices for water lifting and conveying such as hand pumps and pipelines; feasible methods of water use for limited supplies such as drip, hole, subsoil, and super-sheet irrigation; agronomic measures of high water use efficiency; and field micro-catchment for water harvesting and conservation to increase fallow efficiency in rainy seasons. Using the stored runoff water to irrigate the mulched winter wheat and spring corn, as well as vegetables and fruit trees, significant yield increasing and water use efficiency improvements have been achieved. Plastic mulching for increasing fallow efficiency in rainy seasons and improving yield of the next winter wheat crop have been developed and demonstrated. These techniques have provided obvious benefits in terms of soil and water conservation on slope farmland in the hill regions and remarkable effects of storing water and reducing drought in the dryland farming regions have been obtained. 相似文献
660.
长江流域旱涝灾害特征研究 总被引:2,自引:0,他引:2
利用长江流域地区(1956-2007年)148个站点全年的逐日降水资料,采用Z指数作为旱涝指标,对长江流域地区旱涝的转化规律及其时空变化特征进行了探讨,结果表明:长江流域降水量具有明显的年际变化,夏季和年降水量的变化趋势一致;春季的降水周期较夏季具有明显的周期性,从研究的时段内看,春季降水周期为17 ~21年为主,夏季以10~ 15年为主周期;旱涝灾害发生的频率与降水量、暴雨出现的频数呈现正相关,旱涝空间分布上存在一定的结构性,干旱大都发生在长江上游地区(四川和云南的一部分地区)以及湖北部分地区,洪涝主要发生于长江中下游地区,特别是在湖南、安徽、湖北等地. 相似文献