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711.
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渤海湾浮游植物群落特征及其环境影响因子 总被引:1,自引:0,他引:1
于2013年8月、11月分别对渤海湾近岸海域28个点位的浮游植物及水质进行了同步监测调查,并应用冗余分析建立了浮游植物丰度与水环境因子的关系。结果表明,浮游植物共计4门79种(属),以硅藻为主,甲藻占据一定比重。8月优势种为尖刺拟菱形藻(Pseudo-nitzschia pungens)、中肋骨条藻(Skeletonema costatum)、窄隙角毛藻(Chaetoceros affinis)、旋链角毛藻(Chaetoceros curvisetus)和丹麦细柱藻(Leptocylindrus danicus);11月优势种为刚毛根管藻(Rhizosolenia setigera)、优美旭氏藻矮小变型(Schro咬derella delicatula)和中肋骨条藻。浮游植物丰度范围在0.039×103~464.8×103cells/L之间,生物量范围在0.013~81.9 mg/L之间。渤海湾近岸海域浮游植物具有较为明显的空间分布差异,富营养化程度呈现近岸高远岸低的特点。冗余分析(RDA)结果表明,溶解氧、总氮、亚硝酸盐、悬浮物、盐度和水温是影响丰度变化的主要环境因子。 相似文献
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在经典的DEA模型的基础上进行了修正,采用四阶段DEA模型,旨在剔除环境控制变量对效率测度结果的影响.同时,在DEA模型的基础上引入Malmquist指数分析法,以弥补DEA模型无法测度面板数据的缺陷.选取了2012年-2014年A股节能环保上市公司的面板数据,测度了样本的融资效率及三年的融资效率变化情况,结果表明:资源循环利用行业的融资效率最高,其次是环保行业,融资效率最低的是节能行业.样本企业总体的融资效率每年都在增长,但增长速度开始放缓. 相似文献
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Lan-Cui Liu Qi Li Jiu-Tian Zhang Dong Cao 《Mitigation and Adaptation Strategies for Global Change》2016,21(2):191-207
China encourages the demonstration of carbon capture and storage (CCS) projects. In an effort to identify gaps and provide suggestions for environmental risk management of carbon dioxide (CO2) geological storage in China, this article presents a concise overview of potential health, safety and environmental (HSE) risks and environmental management regulations for CO2 geological storage in Australia, Japan, the United States (USA), the European Union (EU), and the United Kingdom (UK). The environmental impact assessment (EIA) experience of Shenhua Ordos Coal-to-Liquid (CTL) Project and PetroChina Jilin Oil Field enhanced oil recovery (EOR) is subsequently analyzed in light of our field investigation, and gaps in current EIA guidelines that are applicable to CO2 geological storage projects are identified. It is found that there are no specific environmental risk regulations suitable for CO2 storage in China, and environmental risk management lags behind the development of CCS technology, which presents a challenge to demonstration enterprises in terms of assessing environmental risk. One major challenge is the overestimation or underestimation of this risk on the part of the enterprise, and another is a lack of applicable regulations for government sectors to supervise the risk throughout CCS projects. Therefore, there is a pressing need for China to formulate environmental management regulations that include environmental risk assessment, mandatory monitoring schemes, environmental emergency plans, and related issues. 相似文献
718.
低温低湿条件下污泥干燥动力学特性研究 总被引:2,自引:0,他引:2
为了研究污泥在低温低湿条件下的干燥规律,获得表征水分迁移过程的有效水分扩散系数(D_(eff))和活化能(E_a),以脱水污泥为研究对象进行了污泥低温低湿干燥试验,探讨了温度(30℃、35℃、40℃、45℃、50℃)和相对湿度(20%、40%、60%)对污泥水分比(MR)和干燥速率(DR)的影响。结果表明,污泥的低温低湿干燥过程属于内部迁移控制,即水分扩散速率决定干燥速率。根据试验数据建立了污泥水分迁移动力学模型,并与6种常用薄层干燥模型进行拟合,通过对决定系数(R~2)、方差(χ~2)和残差平方和(RSS)的比较,得出污泥低温低湿干燥过程可以用Page模型来描述。结合Fick第二定律,得到不同温度(30~50℃)、湿度(20%~60%)条件下污泥有效水分扩散系数的范围为(0.699~1.991)×10~(-9)m~2/s;对传统的Arrhenius公式进行湿度修正,获得了干燥介质温度和湿度对污泥干燥特性影响的数学模型及活化能E_a=23.83 k J/mol。 相似文献
719.
Brett R. Baldwin Aaron D. Peacock Ying‐Dong Gan C. Tom Resch Evan Arntzen Amanda N. Smithgall Susan M. Pfiffner Barry M. Freifeld David C. White Philip E. Long 《补救:环境净化治理成本、技术与工艺杂志》2009,19(4):73-89
An in‐well sediment incubator (ISI) was developed to investigate the stability and dynamics of sediment‐associated microbial communities to prevailing subsurface oxidizing or reducing conditions. Herein we describe the use of these devices at the Old Rifle Uranium Mill Tailings Remedial Action (UMTRA) site. During a seven‐month period in which oxidized Rifle Aquifer background sediment (RABS) were deployed in previously biostimulated wells under iron‐reducing conditions, cell densities of known iron‐reducing bacteria, including Geobacteraceae, increased significantly, showing the microbial community response to local subsurface conditions. Phospholipid fatty acid (PLFA) profiles of RABS following in situ deployment were strikingly similar to those of adjacent sediment cores, suggesting ISI results could be extrapolated to the native material of the test plots. Results for ISI deployment with laboratory‐reduced sediments showed only slight changes in community composition and pointed toward the ability of the ISI to monitor microbial community stability and response to subsurface conditions. © 2009 Wiley Periodicals, Inc. 相似文献
720.
Long Zhou Thomas Woodfin Tian Chen Kun Song 《Journal of Environmental Planning and Management》2018,61(3):430-450
A city's spatial footprint is covered by extensive impervious building roofs and paved surfaces, which contribute to greater storm-water runoff, more surface pollutants, and less carbon sequestration, hence, worse ecosystem services. This research conducts an empirical study on the ecological and economic impacts of a citywide adoption of green roofs and permeable pavements in Corvallis, OR. The effects on ecosystem services of using green roofs and pervious pavements for a low impact development are modelled using Integrated Value of Ecosystem Services Trade-offs and compared to those from the City's current conventional development without green roofs and pervious pavements. The differences are analysed for ecological impact by storm-water yield, storm-water purification, and carbon sequestration and economic impact by a cost-benefit comparison. The results indicate that low impact development, especially intensive green roofs on commercial/industrial buildings and permeable pavements for parking lots, plays a significant role, even with a higher initial implementation cost, for long-term urban sustainability. 相似文献