全文获取类型
收费全文 | 4431篇 |
免费 | 349篇 |
国内免费 | 1317篇 |
专业分类
安全科学 | 425篇 |
废物处理 | 241篇 |
环保管理 | 354篇 |
综合类 | 2584篇 |
基础理论 | 682篇 |
污染及防治 | 1171篇 |
评价与监测 | 231篇 |
社会与环境 | 195篇 |
灾害及防治 | 214篇 |
出版年
2024年 | 14篇 |
2023年 | 94篇 |
2022年 | 283篇 |
2021年 | 257篇 |
2020年 | 253篇 |
2019年 | 183篇 |
2018年 | 190篇 |
2017年 | 218篇 |
2016年 | 232篇 |
2015年 | 286篇 |
2014年 | 302篇 |
2013年 | 461篇 |
2012年 | 394篇 |
2011年 | 408篇 |
2010年 | 317篇 |
2009年 | 259篇 |
2008年 | 279篇 |
2007年 | 262篇 |
2006年 | 195篇 |
2005年 | 171篇 |
2004年 | 115篇 |
2003年 | 125篇 |
2002年 | 118篇 |
2001年 | 82篇 |
2000年 | 95篇 |
1999年 | 87篇 |
1998年 | 81篇 |
1997年 | 64篇 |
1996年 | 55篇 |
1995年 | 52篇 |
1994年 | 30篇 |
1993年 | 39篇 |
1992年 | 25篇 |
1991年 | 16篇 |
1990年 | 12篇 |
1989年 | 7篇 |
1988年 | 12篇 |
1987年 | 5篇 |
1986年 | 4篇 |
1985年 | 1篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1958年 | 1篇 |
1956年 | 2篇 |
排序方式: 共有6097条查询结果,搜索用时 125 毫秒
211.
212.
213.
214.
高温状态下膨润土的物性指标变化是高放核废物深地质处置库设计的重要参数之一。通过高温状态下不同受热时间MX80钠基膨润土的比重、液塑限、自由膨胀率试验,研究了受热时间对膨润土基本物性指标的影响规律;并通过热重分析(TGA)、X衍射(XDR)、电镜扫描(SEM)试验,从微观角度对上述变化规律进行了合理解释。研究结果表明:随着受热时间的增加,膨润土的比重、液塑限、自由膨胀率在受热15~30天内急剧下降,降幅分别为2.5%、3.1%和28.3%,之后各值变化量很小;高温状态下,膨润土的矿物成分转化、结合水脱附、微观形貌改变是膨润土物性指标发生变化的根本原因,三者之间相互作用和彼此影响。 相似文献
215.
The photocatalytic degradation of methylene blue(MB) over Fe-doped CaTiO3 under UV-visible light was investigated. The as-prepared samples were characterized using X-ray diffraction(XRD), scanning electron microscope(SEM) equipped with an energy dispersive spectrometer(EDS) system, Fourier transform infrared spectra(FT-IR), and UV-visible diffuse reflectance spectroscopy(DRS). The results show that the doping with Fe significantly promoted the light absorption ability of CaTiO3 in the visible light region. The Fe-doped CaTiO3 exhibited higher photocatalytic activity than CaTiO3 for the degradation of MB.However, the photocatalytic activity of the Fe-doped CaTiO3 was greatly influenced by the calcination temperature during the preparation process. The Fe-doped CaTiO3 prepared at500°C exhibited the best photocatalytic activity, with degradation of almost 100% MB(10 ppm)under UV-visible light for 180 min. 相似文献
216.
Higher concentrations of Hg can be emitted from coal pyrolysis or gasification than from coal combustion, especially elemental Hg. Highly efficient Hg removal technology from coal-derived fuel gas is thus of great importance. Based on the very excellent Hg removal ability of Pd and the high adsorption abilities of activated carbon(AC) for H2 S and Hg, a series of Pd/AC sorbents was prepared by using pore volume impregnation, and their performance in capturing Hg and H2 S from coal-derived fuel gas was investigated using a laboratory-scale fixed-bed reactor. The effects of loading amount, reaction temperature and reaction atmosphere on Hg removal from coal-derived fuel gas were studied. The sorbents were characterized by N2 adsorption, X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS). The results indicated that the efficiency of Hg removal increased with the increasing of Pd loading amount, but the effective utilization rate of the active component Pd decreased significantly at the same time. High temperature had a negative influence on the Hg removal. The efficiency of Hg removal in the N2-H2S-H2-CO-Hg atmosphere(simulated coal gas) was higher than that in N2-H2S-Hg and N2-Hg atmospheres, which showed that H2 and CO, with their reducing capacity, could benefit promote the removal of Hg. The XPS results suggested that there were two different ways of capturing Hg over sorbents in N2-H2S-Hg and N2-Hg atmospheres. 相似文献
217.
Arsenic in the environment is attracting increasing attention due to its chronic health effects. Although arsenite(As(III)) is generally more mobile and more toxic than arsenate(As(V)), reducing As(V) to As(III) may still be a means for decontamination, because As(III) can be removed from solution by precipitation with sulfide or by adsorption or complexation with other metal sulfides. The performance of As(V) bio-reduction under autohydrogenotrophic conditions was investigated with batch experiments. The results showed that As(V) reduction was a biochemical process while both acclimated sludge and hydrogen were essential. Most of the reduced arsenic remained in a soluble form, although 20% was removed with no addition of sulfate, while 82% was removed when sulfate was reduced to sulfide. The results demonstrated that the reduced arsenic was re-sequestered in the precipitates, probably as arsenic sulfides. Kinetic analysis showed that pseudo first-order kinetics described the bio-reduction process better than pseudo second-order. In particular, the influences of pH and temperature on As(V) reduction by acclimated sludge under autohydrogenotrophic conditions and total soluble As removal were examined. The reduction process was highly sensitive to both pH and temperature, with the optimum ranges of pH 6.5–7.0 and 30–40°C respectively. Furthermore, Arrhenius modeling results for the temperature effect indicated that the As(V) reduction trend was systematic. Total soluble As removal was consistent with the trend of As(V) reduction. 相似文献
218.
浅析大沽河流域水质状况及变化趋势 总被引:1,自引:0,他引:1
大沽河流域监测数据显示:2012年,大沽河干流水质良好,功能区达标率为100%,多数断面综合污染指数呈丰水期枯水期平水期。大沽河主要支流水质总体为轻度污染,主要污染指标为五日生化需氧量、化学需氧量、氟化物,功能区达标率为68.8%,从污染较重河流(桃源河、云溪河、洙河下游)不同水期综合污染指数来看,桃源河和洙河下游呈丰水期﹥平水期﹥枯水期;云溪河由于贯穿胶州城区,受农业面源、降水因素影响较小,呈枯水期﹥丰水期﹥平水期。2006—2012年,大沽河干流水质基本保持稳定,主要支流水质呈改善趋势。 相似文献
219.
220.