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791.
根据上海市新一轮环保三年行动计划(2006~2008年)要求,上海将在未来3年中完成全市11家电厂的35台约6508MW燃煤发电机组的烟气脱硫工程,这同时将产生大量的烟气脱硫副产品——脱硫石膏,处置和利用好脱硫石膏,对上海市的生态环境保护有着重要的意义。阐述了燃煤电厂烟气脱硫石膏的特性和国内外脱硫石膏的利用现状。结合上海实际,对烟气脱硫石膏在建筑建材业.农业等领域的应用前景进行了分析。指出烟气脱硫石膏的资源化利用符合循环经济理念,并能产生良好的环境、社会和经济效益。提出了烟气脱硫石膏的利用建议。 相似文献
792.
The thermodynamic relationships among aqueous solubility and molar volume (MV) , total molecular surface area (TSA) and molecular connectivity index (MCI) for highly hydrophobic chemicals. PCBs are established and discussed, respectively. Good linear relationships exist among In Cs and MV, TSA or MCI. 相似文献
793.
The Al-pillared montmorillonite-supported alkaline earth metal 5M/Al-PILC (PILC = pillared clay, M = Mg, Ca, Sr, and Ba) and xMg/Al-PILC (x = 1, 3, 5, and 7 wt.%) samples were prepared using an impregnation method. Physical properties of the materials were determined by means of X-ray diffraction (XRD) and N2 adsorption-desorption, and their CO2 adsorption behaviors were investigated using the thermogravimetric analyzer (TG), CO2 temperature-programmed desorption (CO2-TPD), and in situ diffuse reflectance infrared transform spectroscopy (in situ-DRIFTS) techniques. It is shown that 5Mg/Al-PILC possessed the highest CO2 adsorption capacity (2.559 mmol/g). The characterization results indicate that Al-pillaring increased the specific surface area of montmorillonite, which was beneficial for the adsorption of CO2. The CO2 adsorption process on the sample was mainly chemical adsorption, and alkalinity was the main factor influencing its adsorption capacity. The alkalinity of the sample was enhanced by loading an appropriate amount of alkaline earth metal, and the adsorbed CO2 was present in the form of bicarbonate and carbonate. In addition, the 5Mg/Al-PILC sample exhibited an excellent regeneration efficiency. We believe that the outcome of this research would provide a good option for developing highly effective CO2 adsorption materials. 相似文献
794.
戴婧 《安全.健康和环境》2018,18(1):21-22,35
石化行业压力容器大开孔结构应用普遍,开孔区域应力情况复杂,利用分析设计技术对大开孔结构进行强度有限元分析,准确地得出了最大应力的位置及数值,保证了结构的安全性,为大开孔结构局部优化提供了计算依据。 相似文献
795.
Mohamed Bayati Jingjing Dai Austin Zambran Chloe ReesMaria Fidalgo de Cortalezzi 《环境科学学报(英文版)》2018,30(3):223-235
Carbon dots are rapidly emerging carbon-based nanomaterials that, due to their growing applications, will inevitable find their way to natural waters; however, their environmental fate is mostly unknown. Carbon dots with different surface functionality were fabricated and characterized by TEM and FT-IR. Their surface charge, given by the zeta potential, and their hydrodynamic diameter in suspension were investigated under a variety of environmentally relevant conditions. The effect of ionic strength was studied in the presence of monovalent (NaCl) and divalent (CaCl2) cations, for pH levels from 3 to 11; humic acid was used as a model for dissolved natural organic matter. Total potential energies of interactions were modeled by classical DLVO theory. The experimental results showed that water chemistry altered the surface charge of the nanomaterials, but their hydrodynamic size could not be correlated to those changes. Evidence of specific interactions was found for the amino functionalized particles in most cases, as well as the plain carbon dots in the presence of Ca2 + and humic acid. Nanoparticles remained largely stable in suspension, with some exception at the highest ionic strength considered. DLVO theory did not adequately capture the aggregation behavior of the system. Moreover, cation and/or humic acid adsorption negatively affected the emission intensity of the particles, suggesting limitations to their use in natural water sensing applications. The particular stability shown by the carbon dots results in exposure to organisms in the water column and the possibility of contamination transported to significant distances from their source. 相似文献
796.
复杂工业系统中人因失误根本原因分析 总被引:6,自引:3,他引:6
在现代大规模复杂人 -机 -环境系统中 ,人因失误诱发的故障或事件呈上升趋势。人因事件的根本原因分析 ,对于防范复杂系统中事故的发生是非常必要的。人因事件根本原因的分析包括 :需要分析的人因事件的确定 ;对事实进行调查 ,分析调查结果 ;确定根本原因 ;制定纠正措施 ;完成最终报告。人因事件的分析最终需要找出失效屏障并提出修补的方法 ,笔者采用事件与原因因子分析技术来进行分析。在分析过程中 ,需要绘出事件和原因因子图 (E&CF图 ) ,而E&CF图可以显示出从开始到结束全过程中事件发生的正确次序 ,通常包括失效屏障 ,预先存在的条件、次级事件、不恰当的动作和形成事件的原因因子。形成人因事件的原因因子在复杂工业系统中 ,可以分成 12个部分。笔者给出了核电厂蒸汽发生器 (SG)主给水阀门泄漏的人因事件的分析实例 ,确认了该实例中失效的屏障和事件的根本原因并提出了纠正措施。 相似文献
797.
G.Y. QiS.X. Zeng C.M. TamH.T. Yin J.F. WuZ.H. Dai 《Journal of Cleaner Production》2011,19(11):1250-1256
Since the release of ISO 14001 in 1996, China has witnessed a surge in the number of ISO 14001 certification. As an international environmental standard, ISO 14001 has two basic functions: one is playing as an environmental management instrument, while the other as a signal of firms’ better environmental performance to stakeholders. Based on the stakeholder theory, we have examined the effects of community, regulatory and some organizational stakeholders on the diffusion of ISO 14001 certification at Chinese provincial levels. Using a panel data of ISO 14001 certification from each province for the period of 2004-2008 in China, empirical evidence of such relations is found. The finding reveals that signaling to foreign customers and community stakeholders plays a dominant role in encouraging diffusion of ISO 14001 certification. However, as an important organizational stakeholder, foreign investors have shown no significant effect on the diffusion of ISO 14001 in China. 相似文献
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