共查询到20条相似文献,搜索用时 15 毫秒
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不同市场条件下金属露天矿分期方案动态优化有关于金属露天矿分期方案动态优化的整体方案的设计与实施,是结合采选联合优化的一部分内容,针对地下采选一体化实现的露天金属矿采选联合优化,露天金属矿采选联合优化也是与金属露天矿分期方案动态优化相关,对于采选联合优化的选矿过程都是存有金属露天矿分期方案动态优化的内容,这就需要施工人员和设计者在涉及到井下的内部转化以及其他金属露天矿分期方案动态优化部分的过程中能够对于一些采选联合优化的内涵做出详尽的了解和分析。比如地下采矿中通常采用一体化设计,但是这种设计的缺点就是难以进行露天金属矿采选联合优化,但是对于矿山开展的试验性研究工作还是有利的,能够实现按空间位置的一体化是采选联合优化的内涵及发展历程的关键。 相似文献
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The FeS-MnS system is reexamined, both with and without excess iron. When excess iron is present, as is true for sulfide inclusions
within steel, the pseudobinary reveals a peritectic rather than the previously assumed eutectic invariant. The maximum solubility
limits (997 ± 3°C, or 1270 K) in the two solid phases are: a) 7.5 wt pct MnS in FeS, and b) 73.5 wt pct FeS in MnS. The peritectic
liquid contains 66 wt pct Fe, ∼34 wt pct S, and ∼0.4 wt pct Mn. The two solid sulfide phases are nearly stoichiometric in
the presence of excess iron; the Fe-richer sulfide is metal-deficient in the absence of a metallic iron phase. Based on this
study, it is possible to be more specific than heretofore about the Fe-FeS-MnS-Mn region of the Fe-Mn-S ternary. In addition
to the presence of a peritectic, it was concluded that the miscibility gap does not cross the univariant line between primary
metal and (Mn,Fe)S phases. The peritectic liquid and the Mn-richer solid sulfide equilibrate with a metal containing ≤ 0.36 wt pct Mn. These
data help explain the Mn/s ratios required to avoid hot-shortness in regular and resulfurized plain-carbon steels.
G. S. MANN, formerly Graduate Student
This is a part of the dissertation submitted by G. S. Mann for his Ph.D. at the University of Michigan 相似文献
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The subsolidus phase relationships of iron selenide and manganese selenide are examined both with and without excess metallic
iron. In the presence of excess metal, where the situation is similar to that existing in steels, the FeSe-MnSe pseudobinary
has a peritectic at 976 ±3°C (1249 K) with the following phases: Fe (<0.3 wt pctMn) (s), (Fe,Mn)Se(2.5 wt pet MnSe) (s), (Mn,Fe)Se(48.5 wt pct FeSe) (s), and a selenidiliquid (4.3Mn, 37.7Fe, 58 wt pet Se). A minimum is observed in the liquidus surface
at ∼920°C and FeSe-9 wt pet MnSe. A qualitative liquidus surface is proposed for the Fe-FeSe-MnSe-Mn section on the basis
of these results.
This is a part of the Dissertation submitted by G. S. Mann for his Ph.D. at the University of Michigan. 相似文献
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Intermittent exotropia of the divergence excess type 总被引:2,自引:0,他引:2
J Cooper 《Canadian Metallurgical Quarterly》1977,48(10):1261-1273
Sensory and motor anomalies of the intermittent exotropia, the divergence excess type, have been described by various authors. However, previous theories of etiology fail to incorporate all the sensory motor anomalies typically found. The present paper attempts to develop a theory of etiology based upon sensory-motor findings and to offer a treatment plan consistent with those findings. 相似文献
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V Siskind 《Canadian Metallurgical Quarterly》1996,15(14):1535-1544
Kaufman et al. compute the 'excess risk' of a disease in the presence of an exposure as the product of the incidence rate of the disease in the source population, the complement of the aetiologic fraction and the relative risk minus one. Methods for calculating confidence intervals for this quantity are derived when (as in case-control studies) the relative risk is estimated by the odds ratio, firstly from multiple logistic regression analysis and secondly without adjustment for covariates. For the latter an innovative approach based on confidence bounds for the two exposure parameters is suggested. The performance of these systems of confidence intervals is assessed by simulation for the former and by exact enumeration of the distributions involved in the latter. Illustrative examples from a study of agranulocytosis and indomethacin are presented. 相似文献
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