全文获取类型
收费全文 | 75篇 |
免费 | 2篇 |
国内免费 | 15篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 2篇 |
环保管理 | 4篇 |
综合类 | 43篇 |
基础理论 | 17篇 |
污染及防治 | 21篇 |
评价与监测 | 3篇 |
出版年
2023年 | 5篇 |
2022年 | 4篇 |
2021年 | 3篇 |
2020年 | 6篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 2篇 |
2016年 | 1篇 |
2015年 | 3篇 |
2014年 | 7篇 |
2013年 | 1篇 |
2011年 | 6篇 |
2010年 | 5篇 |
2009年 | 3篇 |
2008年 | 3篇 |
2007年 | 3篇 |
2006年 | 2篇 |
2005年 | 1篇 |
2004年 | 3篇 |
2003年 | 6篇 |
2002年 | 4篇 |
2001年 | 1篇 |
2000年 | 4篇 |
1999年 | 3篇 |
1998年 | 1篇 |
1996年 | 1篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1984年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有92条查询结果,搜索用时 15 毫秒
31.
使用石英ESR法示踪河流沉积物源是一种新方法和新理论的探索。本文从拟解决的科学问题出发,在着重分析石英ESR信号强度和CI值物源示踪理论基础之上,讨论了该方法在亚洲现代沙尘沉降物源示踪和地质历史时期风尘堆积物源示踪研究中的有效性,结合ESR测年可覆盖整个第四纪时期的特性,认为石英ESR法不仅可以为物源示踪提供良好的年代框架约束,而且还可以较好的反映地质历史时期沉积物质来源在不同时空尺度上的变化特征。随后,通过对指导思想、研究思路以及长江流域不同河段和主要支流的地质地貌背景、岩石类型分布、水系组合特征以及"源-汇"系统之间物质剥蚀-堆积过程的可通达性等方面的综合论述与分析,讨论了石英ESR法在河流沉积物源示踪上的有效性及其在研究长江流域水系发育历史和沉积演化过程中的可行性。 相似文献
32.
Yasuhiro Sugimoto Daisuke Tashima Yoki Asano 《Process Safety and Environmental Protection》2011,89(5):323-326
We developed a new system for collecting electrons generated by bacterial activity to supply DC (direct current) electrical energy. This system used eight titanium sub-electrodes (surface area of each sub-electrode: 189 cm2) connected to one central main titanium electrode (surface area of electrode: 1571 cm2). The distance between each sub-electrode and the main electrode was 30 cm. In an initial experiment, we collected electrons during composting cattle excreta, which was mixed with a commercially available microbial compost activator/starter. We analysed the relationships between the composting temperature and electrical current and voltage. Electrons were effectively collected and used successfully to obtain DC electrical energy. Generation of a stable voltage of approximately 0.5 V was clearly observed. This voltage was not related to compost temperature; however, the generated electrical current increased and decreased with compost temperature. The method was then used in a second experiment to collect electrons generated by bacterial activity in an agricultural field (area: 48 m2). Electrons in the field were effectively collected, and we measured a stable voltage of approximately 1.1 V and a stable current of approximately 0.7 mA. The system has the advantages of being simple, easily maintained, inexpensive, and applicable to large-scale agricultural fields. 相似文献
33.
A protocol was developed to fractionate soil particles down to the nanocolloid scale by combining sieving, sedimentation,
centrifugation, and cross-flow filtration (CFF). The validity of the method and the performance of the CFF system were tested
by characterizing fractions using laser granulometry, electron microscopy, and chemical analysis. The 0.1-μm-pore-size membrane
CFF system effectively retained nanocolloids (<0.1 μm) as shown by laser granulometry and observed directly by transmission
electron microscopy. However, environmental scanning electron microscopy images of freeze-dried colloids were very different
from their TEM counterparts, suggesting that sample preparation influenced microscopy imaging. Chemical analysis of Cu, Cd,
and organic carbon in each fraction showed that the concentrations of these components increased as particle size decreased,
indicating colloids and nanocolloids play an important role in retaining trace metals. Particle-size fractionation combined
with chemical analysis and electron microscopy can provide insight into the nature and properties of nanocolloids in soil. 相似文献
34.
Tianhao Xi Xiaodan Li Qihui Zhang Ning Liu Shu Niu Zhaojun Dong Cong Lyu 《Frontiers of Environmental Science & Engineering》2021,15(4):55
35.
Xie M.Wu Z.Wang X.Gu J.Chen L.Wang Y. 《应用与环境生物学报》2018,(4):915-920
In an effort to remove BDE-47 residues from the environment, a bacterial strain that is capable of utilizing BDE-47 as the sole carbon source was isolated and screened from soil collected from an e-waste recycling area in Tianjin to analyze the degradation properties. The strain was preliminarily identified as Enterobacter sp. according to a 16S rDNA gene sequence analysis. The strain degraded 35.8% of 525 μg/L of BDE-47 in 35 d when the initial concentration of bacteria was 7.1 × 105 cells/ mL. The product of the biodegradation of BDE-47 was BDE-28. The biodegradation of BDE-47 fit well with first-order kinetics, and its degradation kinetics was ln Ct = - 0.104t + 6.22. With the addition of an electron acceptor, such as Fe3+, SO4 2- and NO3 -, the BDE-47 degradation rate was significantly increased to 49.8%, 59.1%, and 67.3%, respectively. The above results revealed that the strain could degrade BDE-47, which is of importance in the application of environmental bioremediation of BDE-47. © 2018 Science Press. All rights reserved. 相似文献
36.
Caiyan Qu Lushan Li Fan Feng Kainian Jiang Xing Wu Muchuan Qin Jia Tang Xi Tang Ruiyang Xiao Di Wu Chongjian Tang 《Frontiers of Environmental Science & Engineering》2023,17(9):115
37.
Jing Gu Hongtao Yu Xie Quan Shuo Chen Junfeng Niu 《Frontiers of Environmental Science & Engineering》2020,14(4):72
38.
Chao Lu Kanglan Deng Chun Hu Lai Lyu 《Frontiers of Environmental Science & Engineering》2020,14(5):82
39.
Asko Noormets Olevi Kull Mark E. Kubiske 《Environmental pollution (Barking, Essex : 1987)》2010,158(4):992-999
The effect of elevated CO2 and O3 on apparent quantum yield (?), maximum photosynthesis (Pmax), carboxylation efficiency (Vcmax) and electron transport capacity (Jmax) at different canopy locations was studied in two aspen (Populus tremuloides) clones of contrasting O3 tolerance. Local light climate at every leaf was characterized as fraction of above-canopy photosynthetic photon flux density (%PPFD). Elevated CO2 alone did not affect ? or Pmax, and increased Jmax in the O3-sensitive, but not in the O3-tolerant clone. Elevated O3 decreased leaf chlorophyll content and all photosynthetic parameters, particularly in the lower canopy, and the negative impact of O3 increased through time. Significant interaction effect, whereby the negative impact of elevated O3 was exaggerated by elevated CO2 was seen in Chl, N and Jmax, and occurred in both O3-tolerant and O3-sensitive clones. The clonal differences in the level of CO2 × O3 interaction suggest a relationship between photosynthetic acclimation and background O3 concentration. 相似文献
40.
Minori Uchimiya Leonid Gorb Mohammad M. Qasim 《Environmental pollution (Barking, Essex : 1987)》2010,158(10):3048-3053
Extensive studies have been conducted in the past decades to predict the environmental abiotic and biotic redox fate of nitroaromatic and nitramine explosives. However, surprisingly little information is available on one-electron standard reduction potentials (Eo(R-NO2/R-NO2−)). The Eo(R-NO2/R-NO2−) is an essential thermodynamic parameter for predicting the rate and extent of reductive transformation for energetic residues. In this study, experimental (linear free energy relationships) and theoretical (ab initio calculation) approaches were employed to determine Eo(R-NO2/R-NO2−) for nitroaromatic, (caged) cyclic nitramine, and nitroimino explosives that are found in military installations or are emerging contaminants. The results indicate a close agreement between experimental and theoretical Eo(R-NO2/R-NO2−) and suggest a key trend: Eo(R-NO2/R-NO2−) value decreases from di- and tri-nitroaromatic (e.g., 2,4-dinitroanisole) to nitramine (e.g., RDX) to nitroimino compound (e.g., nitroguanidine). The observed trend in Eo(R-NO2/R-NO2−) agrees with reported rate trends for reductive degradation, suggesting a thermodynamic control on the reduction rate under anoxic/suboxic conditions. 相似文献