全文获取类型
收费全文 | 334篇 |
免费 | 22篇 |
国内免费 | 153篇 |
专业分类
安全科学 | 17篇 |
废物处理 | 25篇 |
环保管理 | 19篇 |
综合类 | 214篇 |
基础理论 | 100篇 |
污染及防治 | 93篇 |
评价与监测 | 14篇 |
社会与环境 | 13篇 |
灾害及防治 | 14篇 |
出版年
2024年 | 1篇 |
2023年 | 10篇 |
2022年 | 14篇 |
2021年 | 20篇 |
2020年 | 16篇 |
2019年 | 21篇 |
2018年 | 21篇 |
2017年 | 16篇 |
2016年 | 18篇 |
2015年 | 24篇 |
2014年 | 22篇 |
2013年 | 26篇 |
2012年 | 20篇 |
2011年 | 17篇 |
2010年 | 28篇 |
2009年 | 21篇 |
2008年 | 24篇 |
2007年 | 14篇 |
2006年 | 19篇 |
2005年 | 5篇 |
2004年 | 14篇 |
2003年 | 15篇 |
2002年 | 4篇 |
2001年 | 13篇 |
2000年 | 9篇 |
1999年 | 9篇 |
1998年 | 18篇 |
1997年 | 17篇 |
1996年 | 17篇 |
1995年 | 8篇 |
1994年 | 11篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 4篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1985年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有509条查询结果,搜索用时 156 毫秒
71.
J. Sun Y. P. Li X. W. Zhuang S.W. Jin G. H. Huang R. F. Feng 《Mitigation and Adaptation Strategies for Global Change》2018,23(4):553-578
In this study, an integrated simulation-based allocation modeling system (ISAMS) is developed for identifying water resources management strategies in response to climate change. The ISAMS incorporates global climate models (GCMs), a semi-distributed land use-based runoff process (SLURP) model, and a multistage interval-stochastic programming (MISP) approach within a general framework. The ISAMS can not only handle uncertainties expressed as probability distributions and interval values but also reveal climate change impacts on water resources allocation under different projections of GCMs. The ISAMS is then applied to the Kaidu-kongque watershed with cold arid characteristics in the Tarim River Basin (the largest inland watershed basin in China) for demonstrating its efficiency. Results reveal that different climate change models corresponding to various projections (e.g., precipitation and temperature) would lead to changed water resources allocation patterns. Variations in water availability and demand due to uncertainties could result in different water allocation targets and shortages. A variety of decision alternatives about water allocations adaptive to climate change are generated under combinations of different global climate models and ecological water release plans. These findings indicate that understanding the uncertainties in water resources system, building adaptive methods for generating sustainable water allocation patterns, and taking actions for mitigating water shortage problems are key adaptation strategies responding to climate change. 相似文献
72.
自我决定理论指在自我决定的意义上说,行为是主观上自主选择、自主决定的,而不是迫于某种内在需要或外在力量的压力。自我决定动机区分了促进内部动机的社会环境,分别涉及三种不同的心理需要:胜任、自主和关系。三个基本的需要缺一不可,也就是说只有在三个基本心理需要都得到满足时,自我决定动机和自我决定行为才能产生。教师在环境教育课程中运用自我决定理论培养学生环境动机,可采用三种教学策略:获取学校其他教师、行政人员、家长和社会的支持;选择学生感兴趣的,具有挑战性的问题;采用合作学习与探究学习的方式。 相似文献
73.
上海市区排水管道通沟污泥处理处置探讨 总被引:2,自引:0,他引:2
介绍了上海市排水管道通沟污泥处理处置现状及存在的问题.就如何合理有效的处理处置市区通沟污泥,从拓展污泥处置出路、建立污泥中转体系、出台配套管理措施等3个方面提出了对策建议. 相似文献
74.
A reliable and sensitive competitive real-time fluorescent quantitative immuno-PCR (RTFQ-IPCR) assay using a molecular beacon
was developed for the determination of trace fluoranthene (FL) in the environment. Under optimized assay conditions, FL can be
determined in the concentration range from 1 fg/mL to 100 ng/mL, with y = 0.194x + 7.859, and a correlation coe cient of 0.967 was
identified, with a detection limit of 0.6 fg/mL. Environmental water samples were successfully analyzed, recovery was between 90% and
116%, with intra-day relative standard deviation (RSD) of 6.7%–12.8% and inter-day RSD of 8.4%–15.2%. The results obtained from
RTFQ-IPCR were confirmed by ELISA, showing good accuracy and suitability to analyze FL in field samples. As a highly sensitive
method, the molecular beacon-based RTFQ-IPCR is acceptable and promising for providing reliable test results to make environmental
decisions. 相似文献
75.
Likun Gu Zhihui Bai Bo Jin Jianyun Zhang Wenying Li Guoqiang Zhuang Hongxun Zhang 《环境科学学报(英文版)》2010,22(9):1407-1412
A phyllosphere bacterial strain EBL-06 was isolated from wheat leaves. The morphology, cultural characteristics, phospholipid fatty acids, physiological and antagonistic fungus activities of this strain were investigated. A phylogenetic tree was constructed by comparing with the published 16S rDNA sequences of the relevant bacteria. The results showed that the isolate EBL-06 was a strain of Paenibacillus polymyxa; this strain performed a high level of antagonistic fungus activity toward a broad spectrum of phytopathogens, such as Botrytis cinerea, Cladosporium cucumerinum, Fusarium spp. The isolate EBL-06 can grow well using monosodium glutamate wastewater (MGW) and potato wastewater (PW) as culture medium. The maximum yield of 6.5 × 10 9 CFU/mL of the isolate EBL-06 anti-fungus biocontrol agent was reached in 15 hr cultivation at 28°C, pH 6.0–7.5 using the mixture of MGW and PW (1:9). 相似文献
76.
Numerical evaluation of the effectiveness of NO2 and N2O5 generation during the NO ozonation process
Haiqiang Wang Zhuokai Zhuang Chenglang Sun Nan Zhao Yue Liu Zhongbiao Wu 《环境科学学报(英文版)》2016,28(3):51-58
Wet scrubbing combined with ozone oxidation has become a promising technology for simultaneous removal of SO2 and NOx in exhaust gas. In this paper, a new 20-species, 76-step detailed kinetic mechanism was proposed between O3 and NOx. The concentration of N2O5 was measured using an in-situ IR spectrometer. The numerical evaluation results kept good pace with both the public experiment results and our experiment results. Key reaction parameters for the generation of NO2 and N2O5 during the NO ozonation process were investigated by a numerical simulation method. The effect of temperature on producing NO2 was found to be negligible. To produce NO2, the optimal residence time was 1.25 sec and the molar ratio of O3/NO about 1. For the generation of N2O5, the residence time should be about 8 sec while the temperature of the exhaust gas should be strictly controlled and the molar ratio of O3/NO about 1.75. This study provided detailed investigations on the reaction parameters of ozonation of NOx by a numerical simulation method, and the results obtained should be helpful for the design and optimization of ozone oxidation combined with the wet flue gas desulfurization methods (WFGD) method for the removal of NOx. 相似文献
77.
介绍了以功能安全国际标准IEC61508和IEC61511工程应用要求为依据,集安全仪表系统的安全仪表功能安全完整性等级(SIL)分配、安全要求规范(SRS)制定、SIL验证、可靠性数据管理等多功能为一体的安全仪表系统可靠性专用评估软件。 相似文献
78.
79.
80.
在静置换水条件下,研究了低pH值对大型存活、生长和生殖的影响。结果表明,在25±1℃下,急性试验低pH值对大型的24h和48hLL50值及其95%可信限分别为pH值4.66±0.19和4.94±0.20。慢性试验进行了14天,对存活和生长,pH值1.75有影响,pH值5.0没有影响;对生殖,pH值5.0有影响,pH值5.5没有影响。显示出低pH值对大型的毒性阈限在pH值5.00-5.50之间。 相似文献