全文获取类型
收费全文 | 1172篇 |
免费 | 128篇 |
国内免费 | 421篇 |
专业分类
安全科学 | 109篇 |
废物处理 | 44篇 |
环保管理 | 86篇 |
综合类 | 829篇 |
基础理论 | 222篇 |
污染及防治 | 277篇 |
评价与监测 | 48篇 |
社会与环境 | 45篇 |
灾害及防治 | 61篇 |
出版年
2024年 | 7篇 |
2023年 | 32篇 |
2022年 | 81篇 |
2021年 | 76篇 |
2020年 | 84篇 |
2019年 | 64篇 |
2018年 | 66篇 |
2017年 | 67篇 |
2016年 | 72篇 |
2015年 | 66篇 |
2014年 | 101篇 |
2013年 | 89篇 |
2012年 | 100篇 |
2011年 | 88篇 |
2010年 | 98篇 |
2009年 | 89篇 |
2008年 | 87篇 |
2007年 | 87篇 |
2006年 | 57篇 |
2005年 | 36篇 |
2004年 | 23篇 |
2003年 | 24篇 |
2002年 | 26篇 |
2001年 | 40篇 |
2000年 | 40篇 |
1999年 | 27篇 |
1998年 | 19篇 |
1997年 | 14篇 |
1996年 | 12篇 |
1995年 | 10篇 |
1994年 | 16篇 |
1993年 | 10篇 |
1992年 | 4篇 |
1991年 | 1篇 |
1990年 | 3篇 |
1989年 | 1篇 |
1988年 | 3篇 |
1983年 | 1篇 |
排序方式: 共有1721条查询结果,搜索用时 31 毫秒
961.
962.
963.
Xuliang Zhuang Zhen Han Zhihui Bai Hojae Shim 《Environmental pollution (Barking, Essex : 1987)》2010,158(5):1119-1126
Environments with high-salt concentrations are often populated by dense microbial communities. Halophilic microorganisms can be isolated from different saline environments and different strains even belonging to the same genus have various applications. Wastewater and soil rich in both organic matter and salt are difficult to treat using conventional microorganisms typically found in wastewater treatment and soil bioremediation facilities. Studies on decontaminative capabilities and decontamination pathways of organic contaminants (i.e., aromatic compounds benzoate, cinnamate, 3-phenylpropionate, 4-hydroxybenzoic acid), heavy metals (i.e., tellurium, vanadium), and nutrients in the biological treatment of saline wastewater and soil by halophilic microorganisms are discussed in this review. 相似文献
964.
以浙江省江山市淤头镇联户沼气工程为例,从经济、技术及社会可行性三方面进行具体分析,指出联户沼气相比户用沼气具有规模经济效益显著、资金支持渠道多、管理便利、农户满意度高、技术和市场创新空间大等突出优势,可为联户沼气工程推广提供经验借鉴。 相似文献
965.
采用涡流空化(SC)/Fenton协同降解溶液中活性艳红K-2BP,探讨了H2O2、Fe2+、pH、涡流压力以及活性艳红K-2BP初始浓度对SC/Fenton降解效果的影响。结果表明,H2O2和Fe2+的浓度过高或过低都会降低活性艳红K-2BP的降解率,低pH环境有助于活性艳红K-2BP的降解,活性艳红K-2BP的降解率随涡流压力的增大而升高,随其初始浓度的增加而降低。当活性艳红K-2BP初始质量浓度为10mg/L,H2O2质量浓度为165mg/L,Fe2+摩尔浓度为1.5×10-4mol/L,pH为4.0,涡流压力为0.8MPa时,活性艳红K-2BP降解率可达91.81%。 相似文献
966.
Huifeng Liu Guohua Liu Ya Li Xing Wu Dan Liu Xiaoqin Dai Ming Xu Fengting Yang 《Environmental science and pollution research international》2016,23(20):20269-20280
Land use conversion and fertilization have been widely reported to be important managements affecting the exchanges of greenhouse gases between soil and atmosphere. For comprehensive assessment of methane (CH4) and nitrous oxide (N2O) fluxes from hilly red soil induced by land use conversion and fertilization, a 14-month continuous field measurement was conducted on the newly converted citrus orchard plots with fertilization (OF) and without fertilization (ONF) and the conventional paddy plots with fertilization (PF) and without fertilization (PNF). Our results showed that land use conversion from paddy to orchard reduced the CH4 fluxes at the expense of increasing the N2O fluxes. Furthermore, fertilization significantly decreased the CH4 fluxes from paddy soils in the second stage after conversion, but it failed to affect the CH4 fluxes from orchard soils, whereas fertilizer applied to orchard and paddy increased soil N2O emissions by 68 and 113.9 %, respectively. Thus, cumulative CH4 emissions from the OF were 100 % lower, and N2O emissions were 421 % higher than those from the PF. Although cumulative N2O emissions were stimulated in the newly converted orchard, the strong reduction of CH4 led to lower global warming potentials (GWPs) as compared to the paddy. Besides, fertilization in orchard increased GWPs but decreased GWPs of paddy soils. In addition, measurement of soil moisture, temperature, dissolved carbon contents (DOCs), and ammonia (NH4 +-N) and nitrate (NO3 ?-N) contents indicated a significant variation in soil properties and contributed to variations in soil CH4 and N2O fluxes. Results of this study suggest that land use conversion from paddy to orchard would benefit for reconciling greenhouse gas mitigation and citrus orchard cultivation would be a better agricultural system in the hilly red soils in terms of greenhouse gas emission. Moreover, selected fertilizer rate applied to paddy would lead to lower GWPs of CH4 and N2O. Nevertheless, more field measurements from newly converted orchard are highly needed to gain an insight into national and global accounting of CH4 and N2O emissions. 相似文献
967.
Environmental occurrences, behavior, fate, and ecological effects of nanomaterials: an introduction to the special series 总被引:1,自引:0,他引:1
Lowry GV Hotze EM Bernhardt ES Dionysiou DD Pedersen JA Wiesner MR Xing B 《Journal of environmental quality》2010,39(6):1867-1874
The release of engineered nanomaterials (ENMs) into the biosphere will increase as industries find new and useful ways to utilize these materials. Scientists and engineers are beginning to assess the material properties that determine the fate, transport, and effects of ENMs; however, the potential impacts of released ENMs on organisms, ecosystems, and human health remain largely unknown. This special collection of four review papers and four technical papers identifies many key and emerging knowledge gaps regarding the interactions between nanomaterials and ecosystems. These critical knowledge gaps include the form, route, and mass of nanomaterials entering the environment; the transformations and ultimate fate of nanomaterials in the environment; the transport, distribution, and bioavailability of nanomaterials in environmental media; and the organismal responses to nanomaterial exposure and effects of nanomaterial inputs, on ecological communities and biogeochemical processes at relevant environmental concentrations and forms. This introductory section summarizes the state of knowledge and emerging areas of research needs identified within the special collection. Despite recent progress in understanding the transport, transformations, and fate of ENMs in model environments and organisms, there remains a large need for fundamental information regarding releases, distribution, transformations and persistence, and bioavailability of nanomaterials. Moreover, fate, transport, bioaccumulation, and ecological impacts research is needed using environmentally relevant concentrations and forms of ENMs in real field materials and with a broader range of organisms. 相似文献
968.
969.
为有效预防职业性肌肉骨骼疾患(WMSDs),提出基于计算机视觉技术与快速全身评估(REBA)结合的作业姿势评估方法,以手工搬运作业为例,通过人体姿态识别AlphaPose模型检测作业姿势,利用提取的各关节点空间位置信息计算身体各部位关节角度;利用SG滤波法处理身体遮挡、光线等对数据的影响,有效保留数据变化信息的同时消除数据突变;根据身体关节角度范围与危害程度对应关系自动评判作业姿势的风险大小。研究结果表明:作业姿势评估方法可通过采集的视频数据自动评估搬运作业的姿势危险性,降低WMSDs风险,通过分析不同下蹲取物姿势风险,可论证作业姿势评估方法的可行性,为及时改善搬运作业中的不安全动作提供参考。 相似文献
970.