全文获取类型
收费全文 | 138篇 |
免费 | 14篇 |
国内免费 | 37篇 |
专业分类
安全科学 | 9篇 |
废物处理 | 7篇 |
环保管理 | 9篇 |
综合类 | 87篇 |
基础理论 | 31篇 |
污染及防治 | 22篇 |
评价与监测 | 21篇 |
社会与环境 | 2篇 |
灾害及防治 | 1篇 |
出版年
2023年 | 3篇 |
2022年 | 5篇 |
2021年 | 6篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 11篇 |
2017年 | 6篇 |
2016年 | 4篇 |
2015年 | 13篇 |
2014年 | 6篇 |
2013年 | 14篇 |
2012年 | 15篇 |
2011年 | 17篇 |
2010年 | 7篇 |
2009年 | 7篇 |
2008年 | 10篇 |
2007年 | 8篇 |
2006年 | 7篇 |
2005年 | 3篇 |
2004年 | 3篇 |
2003年 | 2篇 |
2002年 | 5篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1998年 | 6篇 |
1997年 | 2篇 |
1996年 | 4篇 |
1995年 | 2篇 |
1994年 | 3篇 |
1993年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有189条查询结果,搜索用时 15 毫秒
1.
Fan Jinhong Xu Wenying Gao Tingyao Ma Luming 《Frontiers of Environmental Science & Engineering in China》2007,1(4):504-508
Iron and copper bimetallic system (catalyzed Fe-Cu process) is a promising technology for alkaline nitrobenzene-containing
wastewater treatment. However, little is currently known about the changes of treatment efficiency with time going. This research
investigated the long-term performance of the catalyzed Fe-Cu process to reduce nitrobenzene (NB) in alkaline wastewater.
In addition, the changes of the metal surfaces morphologies and matters before and after the reaction were analyzed by scanning
electron microscopy (SEM) in conjunction with energy-dispersion spectroscopy (EDS) and X-ray diffraction spectroscopy (XRD).
The results showed that the surface properties of copper almost remained unchanged after weeks of operation, which spelled
its strong chemical stability and resistance to poisoning. Moreover, the results indicated that there were two reasons for
the treatment efficiency decreasing with time. One was the gradual iron element consumption due to corrosion. The other was
iron reactivity weakened due to the precipitates accumulation on the surfaces that were mainly Fe3O4 and FeCO.
__________
Translated from Environmental Pollution & Control, 2006, 28(10): 783–785 [译自: 环境污染与防治] 相似文献
2.
X射线晶体学对造岩矿物研究的应用 总被引:2,自引:0,他引:2
本文主要叙述XRD(X射线衍射)及单晶X射线回摆图在选岩矿物研究中的应用,不涉及X射线晶体结构分析。 相似文献
3.
4.
采用X射线光电子能谱(XPS)法研究了HTPB推进剂在80℃热空气烘箱内分别老化0周、13周和24周的元素组成、化学价态及含量变化。通过拟合C,O,N,Cl等元素的XPS谱图,推测该推进剂在常温(25℃)贮存老化初期应是氧化交联,后期则出现降解断链,并认为NH4ClO4缓慢分解,攻击C C不饱和双键,使得C C双键含量降低是HTPB推进剂老化失效的主要原因。Al粉被包裹在推进剂粘合剂内部,XPS法未能检出Al粉。由于Al粉比较稳定,不参与推进剂老化过程,故XPS仍可用于HTPB推进剂老化机理研究。 相似文献
5.
6.
为调查铁路车站X射线行李包检查系统放射防护水平,2017年至2019年对6个铁路车站3种型号检测系统的行李包入口和出口,系统上盖板、左侧、右侧5个位置的空气比释动能率进行620台次检测.结果显示,620台次检测的空气比释动能率检查结果均合格,不同型号、不同检测位置空气比释动能率有统计学差异,其中C型5个检测位置的空气比... 相似文献
7.
在Biot饱和多孔介质动力学理论的基础上,利用Fourier-Bessel级数展开法,通过对含有衬砌洞室的局部场地进行波场分析,得到饱和土半空间中圆柱形衬砌洞室对平面SV波的散射问题的解析解。经验证,本文得到的解可以退化为半空间单相介质的情况。通过与已有的单相弹性介质半空间中圆柱形衬砌洞室对平面SV波散射问题的解析解的对比,验证了此解的正确性。在解析解的基础上,数值计算给出洞口动应力集中放大系数,分析了入射频率和孔洞埋深对柱面上的应力集中因子的影响。 相似文献
8.
锶盐废渣含硫状态分析及硫含量的测定 总被引:1,自引:0,他引:1
锶盐废渣中硫的状态及含量不同其作用大不相同,有的呈现活性导致膨胀破坏,而有的则表现为惰性,因此有必要了解硫的存在状态及含量。分析表明锶盐废渣中硫主要以硫酸盐硫(SO3)和硫化物硫(S2-)两种形式存在。选择硫酸钡重量法和碘量法进行化学测定,然后用X-射线能谱仪进行元素定性分析;并将化学分析和仪器测定两种方法进行对比。结果表明,X-射线能谱法可以快捷、方便地探测锶渣所含各种元素,但不能确定元素的价态;化学分析方法可得到相对准确的元素含量;用硫酸钡重量法和碘量法联合测定锶渣中的硫含量,与X-射线能谱法相比,偏差仅为0.37%。 相似文献
9.
Viau CM Cardone JM Guecheva TN Yoneama ML Dias JF Pungartnik C Brendel M Saffi J Henriques JA 《Chemosphere》2012,86(5):477-484
Tin or stannous (Sn2+) compounds are used as catalysts, stabilizers in plastic industries, wood preservatives, agricultural biocides and nuclear medicine. In order to verify the Sn2+ up-take and toxicity in yeast cells we utilized a multi-elemental analysis known as particle-induced X-ray emission (PIXE) along with cell survival assays and quantitative real-time PCR. The detection of Sn2+ by PIXE was possible only in yeast cells in stationary phase of growth (STAT cells) that survive at 25 mM Sn2+ concentration. Yeast cells in exponential phase of growth (LOG cells) tolerate only micro-molar Sn2+ concentrations that result in intracellular concentration below of the method detection limit. Our PIXE analysis showed that STAT XV185-14c yeast cells demonstrate a significant loss of intracellular elements such as Mg, Zn, S, Fe and an increase in P levels after 1 h exposure to SnCl2. The survival assay showed enhanced tolerance of LOG yeast cells lacking the low-affinity iron and zinc transporters to stannous treatment, suggesting the possible involvement in Sn2+ uptake. Moreover, our qRT-PCR data showed that Sn2+ treatment could generate reactive oxygen species as it induces activation of many stress-response genes, including SOD1, YAP1, and APN1. 相似文献
10.
Yamaguchi N Nakano M Takamatsu R Tanida H 《Journal of environmental radioactivity》2010,101(6):451-9983
The transformation of inorganic iodine (I− and IO3−) incubated in soils with varying amounts of organic matter (Andosols from the surface layer of an upland field and forest, as well as Acrisols from surface and subsurface layers of an upland field) was investigated by using the iodine K-edge X-ray absorption near-edge structure (XANES). After 60 d of reaction, both I− and IO3− were transformed into organoiodine in surface soils containing sufficient amounts of organic matter, whereas IO3− remained unchanged in the subsurface soil of Acrisols with low organic matter contents. Transformation of IO3− into organoiodine was not retarded when the microbial activity in soil was reduced by γ-ray irradiation, suggesting that microbial activity was not essential for the transformation of inorganic iodine into organoiodine. Soil organic matter has the ability to transform inorganic iodine into organoiodine. 相似文献