全文获取类型
收费全文 | 337篇 |
免费 | 17篇 |
国内免费 | 142篇 |
专业分类
安全科学 | 36篇 |
废物处理 | 25篇 |
环保管理 | 20篇 |
综合类 | 153篇 |
基础理论 | 59篇 |
污染及防治 | 164篇 |
评价与监测 | 10篇 |
社会与环境 | 7篇 |
灾害及防治 | 22篇 |
出版年
2023年 | 4篇 |
2022年 | 14篇 |
2021年 | 13篇 |
2020年 | 10篇 |
2019年 | 8篇 |
2018年 | 14篇 |
2017年 | 16篇 |
2016年 | 16篇 |
2015年 | 22篇 |
2014年 | 21篇 |
2013年 | 37篇 |
2012年 | 40篇 |
2011年 | 28篇 |
2010年 | 23篇 |
2009年 | 15篇 |
2008年 | 22篇 |
2007年 | 19篇 |
2006年 | 21篇 |
2005年 | 26篇 |
2004年 | 9篇 |
2003年 | 24篇 |
2002年 | 13篇 |
2001年 | 22篇 |
2000年 | 12篇 |
1999年 | 9篇 |
1998年 | 8篇 |
1997年 | 3篇 |
1996年 | 6篇 |
1995年 | 4篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 3篇 |
1989年 | 1篇 |
1986年 | 2篇 |
1933年 | 1篇 |
排序方式: 共有496条查询结果,搜索用时 531 毫秒
301.
Guorui Liu Minghui Zheng Mingwei Cai Zhiqiang Nie Bing Zhang Wenbin Liu Bing Du Shujun Dong Jicheng Hu Ke Xiao 《Chemosphere》2013,90(9):2453-2460
In this study, field measurements were conducted to estimate and characterize the atmospheric emission levels and profiles of polychlorinated biphenyls (PCBs) from multiple industrial thermal processes. The emission levels and profiles of PCBs from five types of thermal processes at twenty-three plants were studied and compared with eight processes reported in our previous studies. Correlation analysis was preformed to identify a marker congener for emission of ΣPCB. A significant correlation was observed between congener CB-118 and ΣPCB (R2 = 0.65 and p < 0.01), which suggests that CB-118 is a good marker congener for emission of ΣPCB. The profiles of PCBs emitted from the thirteen thermal processes were compared, and this information could be used for studying source–receptor relationships and identifying the specific sources of PCBs. To prioritize the sources for control, the concentrations of PCBs from thirteen industrial thermal sources were compared. The PCB concentrations from secondary zinc smelting and thermal wire reclamation were about one to three order magnitude higher than those of other sources, which suggests that these two sources be given priority in PCB source control. Finally, the atmospheric emission factors of PCBs from the thirteen industrial sources were summarized, and these data will be useful for developing an integrated emission inventory of PCBs. 相似文献
302.
Effective planning of resources management is important for facilitating socio-economic development and eco-environmental sustainability. Such a planning effort is complicated with a variety of uncertain, dynamic and nonlinear factors as well as their interactions. In this study, an inexact-stochastic quadratic programming with recourse (ISQP-R) method is developed for reflecting dynamics of system uncertainties based on a complete set of scenarios as well as tackling nonlinearities in the objective function to reflect the effects of marginal utility on system benefits and costs. Moreover, since penalties are exercised with recourse against any infeasibility, the ISQP-R can support the analysis of various policy scenarios that are associated with different levels of economic consequences when the promised targets are violated. The developed method is applied to a case study of planning resources management and developing regional ecological sustainability. The results have been generated and are helpful for decision makers in not only identifying desired resources-allocation strategies but also gaining insight into the tradeoff between economic objective and eco-environment violation risk. 相似文献
303.
304.
高水分蔬菜和花卉废物序批式进料联合堆肥的中试 总被引:8,自引:3,他引:5
以滇池流域典型蔬菜废物(西芹、白菜)和花卉废物(石竹)为原料,进行了序批式联合堆肥的试验研究.以西芹和石竹作为初始物料,控制初始混合物料的含水率在60%~70%,每隔4d添加一次白菜;采用温度反馈通气量控制的好氧静态堆肥技术,在堆体温度40℃左右时停止通风.试验分析了堆肥过程中堆体温度、通风速率、水分、pH值、有机质、灰分、体积、NH4+-N,NO3--N等指标随时间的变化特征.结果表明:采用序批式进料、温度反馈通气量控制的静态好氧堆肥技术进行蔬菜和花卉废物联合堆肥可以有效控制堆肥过程,实现有机物料的快速稳定和去除水分,解决了滇池流域蔬菜废物量远大于花卉废物量时堆肥难以有效进行的技术难题. 相似文献
305.
306.
307.
The objective of this study was to investigate the soil nitrogen components of four native artificial plantations at the western edge of the Sichuan Basin. Soil samples from two layers (0-20 cm and 20-40 cm) were collected from 4 plantations (Cryptomeria fortunei, Michelia wilsonii, Phoebe zhennan, and Quercus acutissima) during March, June, September, and December 2015 at the western edge of Sichuan Basin, to perform a comparative analysis on seasonal dynamics. Soil ammonium, nitrate, microbial biomass nitrogen, and environmental factors were synchronously monitored. The results showed that soil inorganic nitrogen was mainly the result of nitrate. The components of labile soil nitrogen showed significant seasonal dynamics. Soil ammonium during the growing season (June and September) was higher than that during the non-growing season (March and December), but soil nitrate, microbial biomass nitrogen, and inorganic nitrogen showed the opposite pattern. Labile nitrogen components in the 0-20 cm layer were generally higher than those in the 20-40 cm layer. Labile soil nitrogen was significantly affected by forest type, which was dependent on season and soil layer. In general, there were significant correlations between the soil nitrogen pools and labile soil nitrogen and the environmental factors, including soil temperature, water content, and monthly rainfall. In conclusion, the variation of labile soil nitrogen was influenced more by season than forest type or soil layer. Compared to the biological effects of tree species, the environmental factors had a stronger effect on labile soil nitrogen. © 2018 Science Press. All rights reserved. 相似文献
308.
输油站的安全管理与消防 总被引:4,自引:0,他引:4
从输油站安全管理的方针、目的、管理对象及内容等方面进行分析和阐述,提出了预防输油站事故发生的技术措施和管理措施,可为输油站安全运营提供参考。 相似文献
309.
Nie Y Li T Yan G Wang Y Ma X 《Journal of the Air & Waste Management Association (1995)》2004,54(2):191-199
Based on the basic characteristics of municipal solid waste (MSW) from regional small cities in China, some optimal management principles have been put forward: regional optimization, long-term optimization, and integrated treatment/disposal optimization. According to these principles, an optimal MSW management model for regional small cities is developed and provides a useful method to manage MSW from regional small cities. A case study application of the optimal model is described and shows that the optimal management scenarios in the controlling region can be gained, adequately validating and accounting for the advantages of the optimal model. 相似文献
310.
污水处理SBR的DAT-IAT工艺又称连续间歇曝气序批式活性污泥法污水处理工艺及系统,是SBR工艺继ICEAS、CASS、CAST、IDEA法之后不断完善的一种新工艺.该工艺同时具有SBR工艺与传统活性污泥法工艺的优点,是一种对原水水质水量的变化和不同处理要求都有很强的适应性,而且运行操作又比较简便的新型工艺技术. 相似文献