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提出一种密度峰值聚类 (density peak clustering, DPC)与遗传算法(genetic algorithm, GA)相结合的新型混合算法(density peak clustering with genetic algorithm, DGA),求解带时间窗的车辆路径问题。首先应用DPC对客户进行聚类以缩减问题规模,再将聚类后的客户用GA进行线路优化。结果表明:DGA在9个数据集上的平均值比模拟退火(simulated annealing, SA)和禁忌搜索(Tabu)分别提高了13.41%和4.7%,单个数据集最大提高了26.4%。这证明了该算法是求解车辆调度问题的高效算法。 相似文献
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针对当前数码印刷产品在设计方面创新性不足的问题,提出数码印刷产品应如何进行创新化设计的思路,并举例说明了艺术设计者如何参与到数码印刷行业,紧贴行业需求,以灵感引领数码印刷产品升级,增加产品附加值,增强数码印刷产品对消费者的吸引力。 相似文献
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采用激光快速成型先进技术制造出316L不锈钢薄壁金属零件。研究结果表明,所成型零件的组织致密,组织特征为枝晶组织并且化学成分分布均匀。同时,金属薄壁零件的力学性能与常规加工方法制造的零件的力学性能相当,表明激光快速成型的金属零件可满足实际使用要求。 相似文献
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采用银金属辅助化学腐蚀技术在多晶硅衬底上制备了黑硅绒面,通过能谱仪、扫描电子显微镜和反射率测试仪对所制备黑硅样品的表面银金属残留、形貌和光吸收进行了表征和分析。在此基础之上,通过扩散、腐蚀清洗、镀膜和印刷烧结测试等工序,将多晶黑硅样品制备成太阳电池片,并通过I-V和EL测试仪对其光伏性能和电致发光特性进行了测量和分析。结果表明,与无银残留样品规则、均匀的圆形腐蚀坑绒面相比,黑硅制备过程中如果有银离子残留在表面,扩孔后的表面形貌呈现为方向杂乱和深浅不一的凹坑状形貌,且凹坑周围边界尖锐、形状不规则,制备成电池后转换效率偏低3.03%。 相似文献
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Self-propagating high-temperature synthesis (SHS) with reduction process was used to fabricate TiB2 powder from TiO2-B2O3-Mg system. The colloidal alumina-bonded TiB2 paste was prepared and coated on the cathode carbonblocks. Various properties of the baked paste such as the corrosive resistance, thermal expansion and wettability were tested. Experimental results showed that the colloidal alumina-bonded TiB2 coating could be well wetted by liquid alum inum; and the thermal expansion coefficient of the coated material was 5.8× 10 6 ℃ -1 at 20-1000℃, which was close to that of the traditional anthracite block cathode (4× 10 6 ℃ 1); the electrical resistivity was 8 μΩ·m at 900℃ when the con tent of alumina in the coated material was about 9% in mass fraction. In addition, some other good results such as sodium resistance were also reported. 相似文献
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