全文获取类型
收费全文 | 863篇 |
免费 | 80篇 |
国内免费 | 180篇 |
专业分类
安全科学 | 127篇 |
废物处理 | 66篇 |
环保管理 | 67篇 |
综合类 | 436篇 |
基础理论 | 113篇 |
污染及防治 | 161篇 |
评价与监测 | 143篇 |
社会与环境 | 7篇 |
灾害及防治 | 3篇 |
出版年
2024年 | 9篇 |
2023年 | 11篇 |
2022年 | 27篇 |
2021年 | 22篇 |
2020年 | 32篇 |
2019年 | 16篇 |
2018年 | 22篇 |
2017年 | 35篇 |
2016年 | 45篇 |
2015年 | 54篇 |
2014年 | 65篇 |
2013年 | 109篇 |
2012年 | 81篇 |
2011年 | 80篇 |
2010年 | 40篇 |
2009年 | 45篇 |
2008年 | 37篇 |
2007年 | 48篇 |
2006年 | 54篇 |
2005年 | 33篇 |
2004年 | 31篇 |
2003年 | 33篇 |
2002年 | 30篇 |
2001年 | 32篇 |
2000年 | 22篇 |
1999年 | 23篇 |
1998年 | 28篇 |
1997年 | 19篇 |
1996年 | 13篇 |
1995年 | 3篇 |
1994年 | 6篇 |
1993年 | 4篇 |
1992年 | 6篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1983年 | 1篇 |
排序方式: 共有1123条查询结果,搜索用时 31 毫秒
991.
Ana Beatriz R.J. Passos Marco Antonio M. Freitas Lívia G. Torres Antonio A. Silva Maria Eliana L.R. Queiroz Cláudio F. Lima 《Journal of environmental science and health. Part. B》2013,48(8):646-650
This study was undertaken to obtain information about the behavior of sulfentrazone in soil by evaluating the sorption and desorption of the herbicide in different Brazilian soils. Batch equilibrium method was used and the samples were analyzed by high performance liquid chromatography. Based on the results obtained from the values of Freundlich constants (Kf), we determined the order of sorption (Haplic Planosol < Red-Yellow Latosol < Red Argisol < Humic Cambisol < Regolitic Neosol) and desorption (Regolitic Neosol < Red Argisol < Humic Cambisol < Haplic Planosol < Red-Yellow Latosol) of sulfentrazone in the soils. The process of pesticide sorption in soils was dependent on the levels of organic matter and clay, while desorption was influenced by the organic matter content and soil pH. Thus, the use of sulfentrazone in soils with low clay content and organic matter (low sorption) increases the probability of contaminating future crops. 相似文献
992.
A comprehensive analytical procedure for a reliable identification of nontarget polar contaminants in aquatic sediments was developed, based on the application of ultra-high-pressure liquid chromatography (UHPLC) coupled to hybrid quadrupole time-of-flight mass spectrometry (QTOFMS). The procedure was applied for the analysis of freshwater sediment that was highly impacted by wastewater discharges from the pharmaceutical industry. A number of different contaminants were successfully identified owing to the high mass accuracy of the QTOFMS system, used in combination with high chromatographic resolution of UHPLC. The major compounds, identified in investigated sediment, included a series of polypropylene glycols (n = 3-16), alkylbenzene sulfonate and benzalkonium surfactants as well as a number of various pharmaceuticals (chlorthalidone, warfarin, terbinafine, torsemide, zolpidem and macrolide antibiotics). The particular advantage of the applied technique is its capability to detect less known pharmaceutical intermediates and/or transformation products, which have not been previously reported in freshwater sediments. 相似文献
993.
废旧橡胶胶粉低温粉碎技术研究进展及趋势 总被引:1,自引:0,他引:1
李琳 《再生资源与循环经济》2011,4(10):38-41
介绍了国内外废旧橡胶低温粉碎技术(液氮冷冻粉碎法、空气膨胀制冷法)的研究进展,指出其在我国应用缺乏经济可行性。将液化天然气(LNG)冷能直接用于废旧橡胶低温粉碎可有效降低生产成本,应用前景广阔,是我国未来精细和微细胶粉生产领域的重要研究内容和发展方向之一。 相似文献
994.
养殖场废水中磺胺类和四环素抗生素及其抗性基因的定量检测 总被引:9,自引:0,他引:9
抗生素滥用及其诱导产生的抗生素抗性基因(antibiotic resistance genes,ARGs)污染已经引起人们的广泛关注。选取上海市某地养殖场作为研究对象,采用高效液相色谱-质谱法和实时荧光定量PCR法,对养殖场污水及附近农田灌溉渠河水中5种四环素及磺胺类抗生素,8种对应的ARGs的含量、特征及相关性进行了研究。研究结果显示,在采集的水样中均含有待检测的5种抗生素,养殖污水中抗生素含量高于农田灌溉河水,各样本中四环素类抗生素含量均略高于磺胺类抗生素,2种四环素抗生素总量为294.0~376.1μg﹒L-1,3种磺胺类抗生素总量为197.7~323.0μg﹒L-1。养殖场污水样本中8种ARGs均有检出,磺胺类抗性基因中sul(A)含量最高,绝对拷贝数为108.4108~1010.3728;四环素类抗性基因中tet(W)含量最高,绝对拷贝数为106.18805~107.8874。农田灌溉渠河水中除tet B(P)外,其它7种ARGs均有检出。样本中ARGs相对表达量总体呈现磺胺类ARGs高于四环素类ARGs的特点。抗生素浓度与ARGs相对表达量的Pearson相关性分析显示,样本中sul(Ⅲ)与磺胺类抗生素浓度存在较明显的正相关性,但其它几种ARGs与抗生素则未见或存在一定负相关性。表明除抗生素外,ARGs在水环境中的丰度可能与ARGs种类及其它环境因子有关。该研究将有助于认识上海地区养殖场废水中抗生素和ARGs污染状况,为进一步开展黄浦江水域抗生素尤其是ARGs的污染研究提供数据基础。 相似文献
995.
火灾事故后果评价方法在LNG储罐发生BLEVE爆炸上的应用 总被引:6,自引:0,他引:6
介绍了LNG储罐站的发展背景和现状;采用火灾事故后果分析方法建模,分析计算了LNG储罐站发生BLEVE爆炸所产生的火球直径、持续时间、提升高度、热辐射能量、冲击波破坏的范围、火灾爆炸事故对人及周围设施破坏的程度等;提出了在我国开展此类工程评估工作过程中的一些观点和设想。 相似文献
996.
This study was undertaken to screen the filamentous fungi isolated from its relevant habitats (wastewater, sewage sludge and sludge cake) for the bioconversion of domestic wastewater sludge. A total of 35 fungal strains were tested against wastewater sludge (total suspended solids, TSS 1%-5% w/w) to evaluate its potentiality for enhancing the biodegradability and dewaterability using liquid state bioconversion(LSB) process. The strains were divided into five groups i. e. Penicillium, Aspergillus, Trichoderma, Basidiomycete and Miscellaneous, respectively. The strains WWZP1003, SCahmA103, SCahmT105 and PC-9 among their respective groups of Penicillium,Aspergillus, Trichoderma and Basidiomycete played potential roles in terms of separation (formation of pellets/flocs/filaments),biodegradation(removal of COD) and filtration(filterability) of treated domestic wastewater sludge. The Miscellaneous group was not considered due to its unsatisfactory results as compared to the other groups. The pH value was also influenced by the microbial treatment during fermentation process. The filterability of treated sludge was improved by fungal treatment, and lowest filtration time was recorded for the strain WWZP1003 and SCahmA103 of Penicillium and Aspergillus groups respectively compared with other strains. 相似文献
997.
Different nutrient media experimentally were N, P and Fe-limited conditions and a serial of diluted BGll media. The cell change of morphology and life history, cell number, cell color and cell area of Microcystis were analyzed quantitatively. First, the effects of nitrogen, phosphorus and iron depletion were distinctively different. Phosphorus and iron depletion caused more special division cells,slowly growth increasing, the easier change of bigger cell area. Second, the nitrogen and iron depletion could make the color of alga from green to brown. Finally, according to the resource competition and Monod equation, Microcystis kinetics of phosphorus and iron were also examined. Ks and μmax of phosphorus absorption were 0.0352 μmol/L, 0.493 d^-1 respectively; iron absorption: 0.00323 μmol/L, 0.483d^-1. In a word, some evidences of the Microcystis bloom dominance in certain nutrient conditions were indicated in the experiments. The dominances were determined as the reviving under the adverse circumstances through the special division, the various nitrogen resources,and the lower kinetics of phosphorus and iron than that of most of other algae. The conclusions provided the scientific basis for preventing and managing Microcystis bloom in freshwater. 相似文献
998.
999.
化妆品中邻苯二甲酸酯类环境激素检测方法研究 总被引:6,自引:1,他引:5
建立了用高效液相色谱法测定化妆品中邻苯二甲酸二甲酯(DMP)、邻苯二甲酸二乙酯(DEP)、邻苯二甲酸二丁酯(DBP)3种邻苯二甲酸酯类环境激素的方法。样品用甲醇超声提取、高速离心、0.45μm有机相滤膜过滤。色谱条件选择流动相组成为甲醇-水(85∶15,v/v),紫外检测器波长为224nm。回收率在98.1%~99.8%之间,相对标准偏差RSD在0.78%~1.5%之间,最低检出限在0.48~0.91μg/L之间,相关系数均>0.998。该方法简便易行,可作为化妆品中邻苯二甲酸酯类的测定。 相似文献
1000.