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121.
“固化赤泥-人工膜”复合防渗材料研究 总被引:1,自引:0,他引:1
赤泥本身具有良好的防渗性能,加入石灰作为激发剂,更可提高其防渗性。根据《土工合成材料测试手册》和GB/T 50123—1999《土工试验方法标准》进行渗透试验,结果表明:室内试验在赤泥中加入8%石灰,并夹一层人工防渗膜形成的复合防渗材料,在固化28 d后,其渗透系数可达(7.3~7.4)×10-9 cm/s。在工业试验中,夹入不同厚度和质地的人工防渗膜的石灰(8%)固化赤泥,渗透系数可达到6.32×10-9~1.89×10-7 cm/s。研究成果在中原某铝厂赤泥堆场防渗工程中得到了应用。 相似文献
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对2016年、2017年采暖季太行山沿线传输通道城市大气中PM2.5的OC、EC和水溶性离子进行分析,并利用特征组分比值和元素富集因子变化研究该传输通道的污染特征.结果表明,2017年采暖季通道整体较2016年同期空气质量改善良好,PM2.5浓度由2016年的171.86μg/m3下降为123.90μg/m3.太行山中部城市2017年采暖季较2016年同期PM2.5浓度下降显著,2a采暖季SNA离子(SO2-,NO3-,NH4+ 3种离子总称)浓度与占比呈现"北低南高",加之SNA/EC比值"北低南高",表明南部城市二次无机生成较为严重.而OC、EC浓度与占比呈现"北高南低",Cl-/K+比值和元素Zn、Ba的富集因子北部均高于南部,表明北部城市可能受燃煤和机动车源等一次排放影响较大;各城市2017年采暖季SO2、NO2、CO浓度有所下降,且均呈现"北高南低"趋势,进一步表明北部城市一次排放较为严重. 相似文献
124.
Emission of intermediate volatility organic compounds from a ship main engine burning heavy fuel oil
Haijun Lou Yuejiao Hao Weiwei Zhang Penghao Su Fan Zhang Yingjun Chen Daolun Feng Yifan Li 《环境科学学报(英文版)》2019,31(10):197-204
Intermediate volatility organic compounds (IVOCs) are crucial precursors of secondary organic aerosol (SOA). In this study, gaseous IVOCs emitted from a ship main engine burning heavy fuel oil (HFO) were investigated on a test bench, which could simulate the real-world operations and emissions of ocean-going ships. The chemical compositions, emission factors (EFs) and volatility distributions of IVOC emissions were investigated. The results showed that the main engine burning HFO emitted a large amount of IVOCs, with average IVOC EFs of 20.2–201?mg/kg-fuel. The IVOCs were mainly comprised of unspeciated compounds. The chemical compositions of exhaust IVOCs were different from that of HFO fuel, especially for polycyclic aromatic compounds and alkylcyclohexanes. The volatility distributions of IVOCs were also different between HFO exhausts and HFO fuel. The distinctions in IVOC emission characteristics between HFO exhausts and HFO fuel should be considered when assessing the IVOC emission and related SOA formation potentials from ocean-going ships burning HFO, especially when using fuel-surrogate models. 相似文献
125.
阐述了中国石化安全信息管理平台的设计思想和主要功能,通过实施中国石化内部网运行的安全信息管理系统,为中国石化安全管理信息化提供了应用平台. 相似文献
126.
Lee CC Lin WT Liao PC Su HJ Chen HL 《Environmental pollution (Barking, Essex : 1987)》2006,141(2):381-386
An abandoned pentachlorophenol plant and nearby area in southern Taiwan was heavily contaminated by dioxins, impurities formed in the PCP production process. The investigation showed that the average serum PCDD/Fs of residents living nearby area (62.5 pg WHO-TEQ/g lipid) was higher than those living in the non-polluted area (22.5 and 18.2 pg WHO-TEQ/g lipid) (P<0.05). In biota samples, average PCDD/F of milkfish in sea reservoir (28.3 pg WHO-TEQ/g) was higher than those in the nearby fish farm (0.15 pg WHO-TEQ/g), and Tilapia and shrimp showed the similar trend. The average daily PCDD/Fs intake of 38% participants was higher than 4 pg WHO-TEQ/kg/day suggested by the world health organization. Serum PCDD/F was positively associated with average daily intake (ADI) after adjustment for age, sex, BMI, and smoking status. In addition, a prospective cohort study is suggested to determine the long-term health effects on the people living near factory. 相似文献
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The coupling of gas explosion flame and shock wave is analyzed. In the gas explosion process, shock wave is affected by the flame directly, and shock wave also induces the flame. Inhibiting explosion can be achieved by the interference between the flame and shock wave propagation. If the coupling effects can be damaged, the adverse effects caused by the explosion should be mitigated and controlled. According to the structure characteristics of foam ceramics, the coupling effects mechanism of ceramic foam on gas explosion flame and shock wave is researched. When the explosion goes through the structure of foam ceramics, the flame can be quenched and the shock wave be attenuated. After the flame is quenched, the supply of precursor shock wave energy is cut off. Due to lack of energy supply, the destructive effects of blast wave will be reduced effectively. Coupling effects of the flame and shock wave can be damaged by the special structure of foam ceramics. Studies suggest that a certain function to represent the structure characteristics of foam ceramics must exist. For a certain material of foam ceramics, the sure porosity δ and the pore diameter d also can be get, which is the key to research and develop foam ceramic suppression technology of gas explosion. 相似文献
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针对已完成的振动台试验,采用OpenSees数值模拟计算平台,建立液化侧扩流场地群桩振动台试验数值模型。该模型中,采用线弹性梁柱单元模拟桩和挡墙,采用刚性连接单元和零长度单元模拟桩-土界面。自由水体通过施加节点孔压和节点力模拟。引入多屈服面塑性本构模拟饱和砂层,采用两相完全耦合的u—p形式模拟土体位移和孔压。通过对比振动台试验结果表明,建立的有限元数值模型能够可靠地再现砂层和桩基的动力响应,进而验证数值模型的可靠性。同时,针对两个代表性时刻,分析了桩-土体系的侧向变形响应。所采用的分析方法和相关结论也为同类桩-土体系数值模拟提供一般性分析方法和思路。 相似文献