全文获取类型
收费全文 | 12141篇 |
免费 | 95篇 |
国内免费 | 750篇 |
专业分类
安全科学 | 145篇 |
废物处理 | 934篇 |
环保管理 | 1403篇 |
综合类 | 2122篇 |
基础理论 | 3524篇 |
环境理论 | 1篇 |
污染及防治 | 2680篇 |
评价与监测 | 1106篇 |
社会与环境 | 951篇 |
灾害及防治 | 120篇 |
出版年
2024年 | 2篇 |
2023年 | 39篇 |
2022年 | 110篇 |
2021年 | 110篇 |
2020年 | 65篇 |
2019年 | 72篇 |
2018年 | 1532篇 |
2017年 | 1474篇 |
2016年 | 1305篇 |
2015年 | 248篇 |
2014年 | 230篇 |
2013年 | 271篇 |
2012年 | 690篇 |
2011年 | 1569篇 |
2010年 | 863篇 |
2009年 | 763篇 |
2008年 | 1042篇 |
2007年 | 1370篇 |
2006年 | 146篇 |
2005年 | 127篇 |
2004年 | 101篇 |
2003年 | 144篇 |
2002年 | 173篇 |
2001年 | 68篇 |
2000年 | 64篇 |
1999年 | 62篇 |
1998年 | 61篇 |
1997年 | 54篇 |
1996年 | 35篇 |
1995年 | 33篇 |
1994年 | 29篇 |
1993年 | 20篇 |
1992年 | 23篇 |
1991年 | 16篇 |
1990年 | 18篇 |
1989年 | 13篇 |
1988年 | 5篇 |
1987年 | 6篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 12篇 |
1983年 | 8篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1958年 | 2篇 |
1935年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
Junqin PANG Masami MATSUDA Masashi KURODA Daisuke INOUE Kazunari SEI Kei NISHIDA Michihiko IKE 《Frontiers of Environmental Science & Engineering》2016,10(4):7
To improve nitrogen removal performance of wastewater treatment plants (WWTPs), it is essential to understand the behavior of nitrogen cycling communities, which comprise various microorganisms. This study characterized the quantity and diversity of nitrogen cycling genes in various processes of municipal WWTPs by employing two molecular-based methods:most probable number-polymerase chain reaction (MPN-PCR) and DNA microarray. MPN-PCR analysis revealed that gene quantities were not statistically different among processes, suggesting that conventional activated sludge processes (CAS) are similar to nitrogen removal processes in their ability to retain an adequate population of nitrogen cycling microorganisms. Furthermore, most processes in the WWTPs that were researched shared a pattern:the nirS and the bacterial amoA genes were more abundant than the nirK and archaeal amoA genes, respectively. DNA microarray analysis revealed that several kinds of nitrification and denitrification genes were detected in both CAS and anaerobic-oxic processes (AO), whereas limited genes were detected in nitrogen removal processes. Results of this study suggest that CAS maintains a diverse community of nitrogen cycling microorganisms; moreover, the microbial communities in nitrogen removal processes may be specific.
相似文献
993.
Yan GUO Chuanfu WU Qunhui WANG Min YANG Qiqi HUANG Markus MAGEP Tianlong ZHENG 《Frontiers of Environmental Science & Engineering》2016,10(4):6
The use of PLA/starch blends for nitrogen removal was achieved.
The influence of different operating parameters on responses was verified using RSM.
The conditions for desired responses were successfully optimized simultaneously.
Blends material may have a promising application prospect in the future.
Nitrogen removal from ammonium-containing wastewater was conducted using polylactic acid (PLA)/starch blends as carbon source and carrier for functional bacteria. The exclusive and interactive influences of operating parameters (i.e., temperature, pH, stirring rate, and PLA-to-starch ratio (PLA proportion)) on nitrification (Y1), denitrification (Y2), and COD release rates (Y3) were investigated through response surface methodology. Experimental results indicated that nitrogen removal could be successfully achieved in the PLA/starch blends through simultaneous nitrification and denitrification. The carbon release rate of the blends was controllable. The sensitivity of Y1, Y2, and Y3 to different operating parameters also differed. The sequence for each response was as follows: for Y1, pH>stirring rate>PLA proportion>temperature; for Y2, pH>PLA proportion>temperature>stirring rate; and for Y3, stirring rate>pH>PLA proportion>temperature. In this study, the following optimum conditions were observed: temperature, 32.0°C; pH 7.7; stirring rate, 200.0 r·min-1; and PLA proportion, 0.4. Under these conditions, Y1, Y2, and Y3 were 134.0 μg-N·g-blend-1·h-1, 160.9 μg-N·g-blend-1·h-1, and 7.6 × 103 μg-O·g-blend-1·h-1, respectively. These results suggested that the PLA/starch blends may be an ideal packing material for nitrogen removal. 相似文献
994.
995.
Although Beijing has carried out municipal solid waste (MSW) source separation since 1996, it has largely been ineffective. In 2012, a “Green House” program was established as a new attempt for central sorting. In this study, the authors used material flow analysis (MFA) and cost benefit analysis (CBA) methods to investigate Green House’s environment and economic feasibility. Results showed that the program did have significant environmental benefits on waste reduction, which reduced the amount of waste by 34%. If the Green House program is implemented in a residential community with wet waste ratio of 66%, the proportion of waste reduction can reach 37%. However, the Green House is now running with a monthly loss of 1982 CNY. This is mainly because most of its benefits come from waste reduction (i.e., 5878 CNY per month), which does not turn a monetary benefit, but is instead distributed to the whole of society as positive environmental externalities. Lack of government involvement, small program scale, and technical/managerial deficiency are three main barriers of the Green House. We, thus, make three recommendations: involve government authority and financial support, expand the program scale to separate 91.4 tons of waste every month, and use more professional equipment/technologies. If the Green House program can successfully adopt these suggestions, 33.8 tons of waste can be reduced monthly, and it would be able to flip the loss into a profit worth 35034 CNY.
相似文献
996.
997.
2013年4月20日四川芦山7.0级地震后,四川省宝兴县冷木沟沟道内新增大量崩塌、滑坡物源,在强降雨的诱发下,极易发生泥石流灾害,且沟口直面县城,直接威胁着整个县城的生命、财产安全。利用SCS水文模型,根据冷木沟流域的地貌特征将其划分成17个子流域,在子流域不同的土地利用数据及水文土壤条件下进行产流、汇流计算,最后通过叠加得到冷木沟流域出口断面的汇流过程;对2012年8月18日发生的泥石流汇流过程进行探讨预测,结果显示,本次泥石流的洪峰流量为278m3/s,泥石流总量为20.2×104m3,计算得到的泥石流总量与实际调查结果的相对误差为7.8%;用同一方法预测2013年5月23日冷木沟支沟黑沟的泥石流汇流过程,计算的洪峰流量为38.2 m3/s,与实际监测值的相对误差为4.2%。说明此模型对于冷木沟流域具有适用性,且效果较好,可用于宝兴县冷木沟泥石流的流量预测及泥石流灾害规模预测,将对宝兴县的泥石流防灾减灾工作提供科学指导。 相似文献
998.
999.
1000.
蚯蚓土壤填料生态滤池处理生活污水 总被引:1,自引:0,他引:1
采用二级蚯蚓土壤填料生态滤池对生活污水进行处理,考察其对污水中各类污染物的去除效果。连续运行90d,试验结果表明:滤池运行稳定,对COD、TP、NH3-N、TN和SS的去除效果良好,平均去除率分别为78.7%、93.4%、74.9%、60.4%和87.5%,出水满足GB 1898—2002《城镇污水处理厂污染物排放标准》二级标准。滤池二级串联结构设计系统稳定,改善了出水水质。蚯蚓在试验初期对滤池环境可较好较快的适应,维持了滤池的稳定运行。土壤生态处理技术工艺简单,兼具经济实用和规模灵活的优点,适合推广。 相似文献