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81.
燃煤锅炉低氮氧化物燃烧特性的神经网络预报 总被引:20,自引:2,他引:18
大型燃煤电站锅炉的低NOx燃烧技术日益受到关注,但NOx的排放特性复杂,受煤种、锅炉设计结构和操作参数等多种因素影响.在对某台600MW四角切圆燃煤电站锅炉的NOx排放特性和飞灰含碳量特性进行多工况热态测试的基础上,应用人工神经网络的非线性动力学特性及自学习特性,建立了大型四角切圆燃烧锅炉NOx排放特性和燃烧经济性的神经网络模型,并对此模型进行了校验.结果表明,该模型能根据燃煤特性及各种操作参数准确预报锅炉在不同工况下的NOx排放和飞灰含碳量特性,可为大型电站锅炉通过燃烧调整降低NOx排放和提高锅炉燃烧效率提供有效手段. 相似文献
82.
Effect of temperature and oxygen on the formation of chlorobenzene as the
indicator of PCDD/Fs 总被引:1,自引:0,他引:1
Sampling and analysis of polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs) are both time-consuming and expensive. In principle,real-time monitoring of chlorobenzene(CBz) as an indicator for PCDD/Fs could be useful to control and optimize incinerator operating conditions.To test this strategy,CBz was analyzed together with PCDD/Fs in flue gas samples collected from a hospital waste incinerator.Moreover,lab experiments were conducted to investigate the eect of temperature and oxygen on CBz formation from fly ash from the same incinerator.The experimental results demonstrate that chlorobenzene(in particular PeCBz) correlate well with PCDD/Fs,in line with previous research.The optimum temperature of CBz formation is in a range of 350 to 400°C and CBz yield increases significantly with oxygen,in line with PCDD/Fs formation.This study is useful for confirming the de novo mechanism and defining correlations between CBz and PCDD/Fs. 相似文献
83.
Gang Xiao Baosheng Jin Mingjiang Ni Kefa Cen Yong Chi Zhongxin Tan 《Frontiers of Environmental Science & Engineering in China》2011,5(2):193-204
Considering high-moisture municipal solid waste (MSW) of China, a steam dried MSW gasification and melting process was proposed,
the feasibility was tested, and the mass and energy balance was analyzed. Preliminary experiments were conducted using a fixed-bed
drying apparatus, a 200 kg per day fluidized-bed gasifier, and a swirl melting furnace. Moisture percentage was reduced from
50% to 20% roughly when MSW was dried by slightly superheated steam of 150°C–350°C within 40 min. When the temperature was
less than 250°C, no incondensable gas was produced during the drying process. The gasifier ran at 550°C–700°Cwith an air equivalence
ratio (ER) of 0.2–0.4. The temperature of the swirl melting furnace reached about 1240°C when the gasification ER was 0.3
and the total ER was 1.1. At these conditions, the fly ash concentration in the flue gas was 1.7 g·(Nm3)−1, which meant over 95% fly ash was trapped in the furnace and discharged as slag. 85% of Ni and Cr were bound in the slag,
as well as 60% of Cu. The mass and energy balance analysis indicates that the boiler heat efficiency of an industrial MSW
incineration plant reaches 86.97% when MSW is dried by steam of 200°C. The boiler heat efficiency is sensitive to three important
parameters, including the temperature of preheated MSW, the moisture percentage of dried MS Wand the fly ash percentage in
the total ash. 相似文献
84.
生态环境监测是推进国家生态环境治理体系和治理能力现代化的重要支撑。党中央、国务院高度重视监测事业发展,将生态环境监测纳入生态文明改革的大局统筹推进。"十四五"时期,生态文明改革持续深入,生态环境治理将向精准治污、科学治污、依法治污转变,生态环境监测面临着全新的压力与挑战。因此,笔者以习近平生态文明思想为指导,按照"面向发展、服务公众、智慧监测、精准支撑"的原则,针对大气、地表水、土壤、地下水、生态等重点领域,提出了"十四五"时期生态环境监测的重点目标任务,为生态文明和美丽中国建设提供技术支撑。 相似文献
85.
86.
革用水性聚氨酯的研究 总被引:1,自引:0,他引:1
为适应可持续发展的需要,有必要寻找水性聚氨酯产品来替代原有产品。通过大量研究试验,对不同原材料进行对比筛选,已经开发出一批在模最、透湿量、耐挠等许多性能方面都较好的溶剂型聚氨酯浆料的水性浆料。 相似文献
87.
Photocatalysis is applied increasingly in addressing and solving environmental and energy-related problems. Especially the TiO2-derived catalysts attract attention because of their catalytic efficiency, wide range of applications, ease in use, and low cost (it costs about 150 Yuan a kilogram in China). This review first describes the principles of photocatalytic destruction by semiconductors and then focuses on degradation rates and reaction mechanisms in a variety of photocatalytic uses of modified TiO2. Finally, these concepts are illustrated by selected examples relating to the photocatalytic degradation of organic persistent pollutants, such as polychlorinated benzenes (PCBz), biphenyls (PCB) and dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). And some approaches towards industrial application are analyzed. 相似文献
88.
ZnCl2法污泥含炭吸附剂对模拟烟气中气态汞的吸附 总被引:1,自引:0,他引:1
采用改进的ZnCl2化学活化法制备污泥含炭吸附剂,利用EDS以及氮吸附等多种测试手段对所制得的污泥含炭吸附剂进行表征,并利用其处理模拟烟气汞污染物,实验结果表明,污泥含炭吸附剂对Hg0的吸附包括物理吸附作用和化学吸附作用,以物理吸附作用为主;随着Hg0入口浓度的提高,污泥含炭吸附剂的Hg0饱和吸附容量增大;随着吸附反应温度的升高污泥含炭吸附对Hg0的吸附作用减弱;在吸附反应温度125℃,Hg0入口浓度60.4 μg/m3,污泥含炭吸附剂和选定的活性炭对Hg0的吸附容量分别为81.2 μg/g和53.8 μg/g,污泥含炭吸附剂对Hg0的吸附作用好于选定的活性炭。 相似文献
89.
平板玻璃工业窑炉烟气中低温SCR脱硝中试研究 总被引:2,自引:0,他引:2
我国平板玻璃工业正面临严峻的NOx控制形势,研究并推广玻璃窑炉高效脱硝技术对玻璃工业发展及大气环境保护均具有重要意义。选择性催化还原(SCR)脱硝技术是国内外公认效率最高的脱硝技术,然而该技术在玻璃窑炉中推广应用还面临诸多技术问题。本研究设计并建设了10 000 Nm3/h的平板玻璃工业窑炉中低温SCR脱硝中试装置,分析了玻璃窑炉烟气组分波动规律及其对SCR脱硝系统的潜在影响,考察了烟气温度、喷氨量控制和烟气处理量等工艺参数,开展了为期6 d的连续运行实验。这些在实际烟气中开展的研究为玻璃窑炉SCR脱硝技术研究分享了大量一手数据和经验。 相似文献
90.
用污水处理厂脱水污泥制备含炭吸附剂 总被引:2,自引:0,他引:2
以污水处理厂脱水污泥为原料,分别采用炭化法、物理活化法和化学活化法制备了含炭吸附剂。采用化学活化法制备的含炭吸附剂性能最好,热解温度为450℃时,含炭吸附剂的碘吸附值为313.9mg/g,吸附剂收率为64.36%。采用ZnCl2为活化剂,所制备的含炭吸附剂的性能优于H2SO4,KOH,H3PO4作为活化剂。经正交实验得出的最佳实验条件为:ZnCl2浓度3mol/L,干污泥与活化剂溶液质量比1:4.0,热解温度450℃,热解时间1.5h。制备含炭吸附剂的干污泥粒径以0.6~0.9mm为宜。组合活化剂的效果好于ZnCl2溶液,最佳的组合活化剂为ZnCl2+H2SO4(体积比为3:1)。含炭吸附剂的孔径分布较宽,微孔所占比例较小,以中孔为主,比表面积较小。 相似文献