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This paper presents an ant colony optimization algorithm to address the constrained redundancy allocation problem in order to maximize system reliability for complex binary systems. The constraints involved, though separable, are both linear and non-linear. We couple an adaptive penalty function with the basic ant colony approach to handle highly constrained problems and embed a local search technique to find still better locally optimal solutions. The proposed algorithm has been tested on a large number of problems, containing even up to 500 subsystems, with both fixed and randomly generated parameters. Experimental results demonstrate the advantage of the proposed algorithm to solve similar types of problems. 相似文献
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Rheological aspects of the rejuvenation of aged bitumen 总被引:1,自引:0,他引:1
Ramón Romera Anton Santamaría Juan José Peña Maria Eugenia Muñoz Marisol Barral Esteban García Victorio Jañez 《Rheologica Acta》2006,45(4):474-478
Rheological techniques are used to investigate the rejuvenation of aged bitumen. The thermal transition associated with the collapse of the compact structure constituted by asphaltene is determined by Dynamic Mechanical Thermal Analysis. For aged bitumen, this transition shifts to a higher temperature but when rejuvenating agents are added, the transition returns to its original value. The “rutting factor,” G*/sin δ allows to define the maximum temperature the binder can reach without permanent deformation. The employed rejuvenating agents are suitable because permanent deformation is postponed. Viscosity results reveal that aged bitumen needs a high mixing temperature (>200°C) to behave like a fluid material able to wet, adhere, and envelop aggregates. The addition of rejuvenating agents considerably reduces mixing and compaction temperatures. The mixture of 80% aged bitumen—20% recycled motor oil, obtained exclusively from waste materials is an apt binder that can compete satisfactorily with new 60/70 bitumen.Paper presented at the AERC2005. This paper will be part of a special issue of AERC2005. 相似文献
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R. C. Pastor 《Journal of Crystal Growth》1999,200(3-4):510-514
The 10 μm transparency of halides addresses directly its oxide content. The conversion from oxide to fluoride must have ΔG0. HF(g) is different from the other hydrogen halides because its ΔG of formation is larger than that of H2O(g). Decrease in the hydrolysis of RF3 (R=rare earth) influences the crystal phase stability and the tendency of the crystal to crack. The base-to-acid behavior of +3 rare earths provides quantitative support. HF(g) and RAP (reactive atmosphere process) CF4(g) formations of YF3 from Y2O3 are given in detail. This indifference to HF(g) is reported also in the congruent growth of CaF2, SrF2, and BaF2. The explanation is seen in ZrF4, HfF4, and ThF4. Although RAP does not use HF(g), it permits the congruent growth of good-quality single crystals with very low H2O(g) content. 相似文献
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简要分析了应用于实时多媒体传输的、以RAP为代表的仿TCP速率控制方案的不足,提出了一种TCP友好的、基于RTCP反馈的拥塞控制机制,该机制使发送速率的变化更为平滑.更适合于注重回放质量的实时多媒体应用.与RAP的比较实验显示,在瓶颈链路带宽、时延和包丢失率变化情况下.该机制具有比RAP更好的TCP友好性. 相似文献
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