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921.
922.
沿空掘进软岩巷道桁架联合支护试验研究 总被引:1,自引:0,他引:1
面对软岩巷道支护与维护的难题,提出桁架联合支护的思路.通过现场实测,分析围岩破坏特征;基于祁东煤矿巷道围岩的微观组成和力学参数,采用数值计算分析方法,对不同条件和参数下的巷道变形及应力分布进行模拟分析和支护参数优化,得出适用于沿空掘进软岩巷道的围岩控制方案,为软岩巷道支护提供理论指导,具有广泛的推广应用前景. 相似文献
923.
金J11集团铜j台炼厂(简称铜冶炼厂)是金川集团股份有限公司主流程生产单位,其主要任务是利用火法和湿法冶炼工艺,处理铜精矿和外购冷铜原料,全厂现有职工2867人,共设8个生产及辅助车间和9个职能科室,拥有合成炉、自热炉、倾动炉等26座大型冶金炉窑和2900多个电解槽。2009年以来,铜;台炼厂坚持将“金川五阶段”的普遍原理与铜〉台炼厂具体实际相结合,通过不断的探索和实践, 相似文献
924.
主要对硅藻土的烧结改性进行了进一步的研究,并对改性硅藻土用于污水处理系统生物膜的载体制作进行参数研究。通过设置适宜的污水水力学特性、良好的载体挂膜性能表征、实验运行稳定性等多方面进行对比实验,得出最佳生物膜挂膜性能的改性硅藻土陶瓷生物膜载体。 相似文献
925.
《中国安全生产科学技术》2013,(10):120-120
2013年10月11日,中国安全生产科学研究院院长吴宗之、副院长张兴凯等与华北科技学院校长杨庚宇、副校长张膦等在中国安科院就创新团队发展计划项目申报、研究生联合培养等方面战略合作进行研讨。 相似文献
926.
927.
Does copper reduce cadmium uptake by different rice genotypes? 总被引:4,自引:0,他引:4
A hydroponics experiment was conducted to investigate the effect of copper (Cu) on cadmium (Cd), calcium (Ca), iron (Fe), and zinc (Zn) uptake by several rice genotypes. The experiment was carried out as a 2×2×4 factorial with four rice genotypes and two levels of Cu and Cd in nutrient solution. Plants were grown in a growth chamber with controlled environment. The results showed a significant difference between the biomass of different rice genotypes (P 〈 0.001). The Cd and Cu concentration in the solution had no significant effect on the biomass. The addition of Cu significantly decreased Cd uptake by shoots and roots of rice (P 〈 0.001). The Cd concentration did not significantly influence Ca uptake by plants, whereas the Cu concentration did (P = 0.034). There was a significant influence of Cd on Fe uptake by shoots and roots (P 〈 0.001, P = 0.003, respectively). Zn uptake decreased significantly as the addition of Cd and Cu increased in shoots. We concluded that Cu had significant influence on Cd uptake. The possible mechanisms were discussed. 相似文献
928.
Single and joint effects of petroleum hydrocarbons and cadmium on the
polychaete Perinereis aibuhitensis Grube 总被引:1,自引:1,他引:0
Using the concentration gradient and combined pollutant exposure method, the single and joint effects of petroleum hydrocarbons (PHCs) and cadmium (Cd) on polychaete Perinereis aibuhitensis Grube, an ecologically keystone species in estuarine and coastal environment, have been investigated. The results indicate that the toxicity of PHCs to P. aibuhitensis is stronger than that of Cd to the organism. There are positive correlations between the mortality of worms and the exposed concentration of single Cd or PHCs in solution. Similarly, the accumulation of Cd or PHCs in worms increased with increasing Cd- or PHC-exposed concentrations. All the correlation relationships can be described using unitary quadratic equations (Y or Z = aX^2 + bX + c). It is calculated, on the basis of these expressions, that the median lethal dose (LC50) ofP aibuhitensis exposed to a single Cd or PHCs is 793.4-13567.3 and 28.0-119.9 μg/L, respectively. The exposed time has some stimulative effect on the two pollutants and on the mortality of the worms. Thus, even a low concentration of a single Cd or PHCs may have strong toxic effects on the worms when the exposed time becomes longer. The accumulation of Cd or PHCs in worms differs with an increase in exposure time at the given exposed concentration of a single Cd or PHCs. Noticeably, the accumulation of PHCs in worms decreases with an increase in exposure time at the given high concentration of PHCs in solution. The joint effect of PHCs and Cd on P. aibuhitensis is very complicated and changes with the exposed concentrations of the two pollutants. At the given concentration of PHCs, the joint toxicity of the two pollutants on the worms changes from synergism to antagonism with an increase in Cd concentration. The accumulation of Cd in the worms significantly decreases with the addition of PHCs to exposure solution. 相似文献
929.
930.