Four humic coal samples are extracted to obtain humic substances (HS), and then subdivided(or purified) to obtain sixteen grades of HS, four from each coal. The effectiveness of these sixteen HS samples as additives f...Four humic coal samples are extracted to obtain humic substances (HS), and then subdivided(or purified) to obtain sixteen grades of HS, four from each coal. The effectiveness of these sixteen HS samples as additives for producing coal water mixture (CWM) is tested (w (additive) = 1 % and the the coal used is from the Baiyi coal preparation plant). A linear regression analysis of viscosity versus the additive’s components shows: (1)humic acids(HA) and humin (HM) are much better than fulvic acids (HF) with HA being tbe best, and (2) tke effects of grades of HS on coal dispersion as measured by viscosity are quite different. CWM additive effectiveness correlates positively with the increase of E4/E6,ash content, acid groups, and carboxyl groups, and negatively with the increase of molecular weight, HS content and phenolic alcohol content.展开更多
目前农机跨区紧急作业中供需信息不对称,农机部门缺乏科学合理的紧急调配方案,无法在紧急状况下指导农机进行及时有效的调配。针对上述问题,该文研究了农机跨区作业紧急调配模型和算法。首先分析了多机多任务紧急调配过程,建立了以最小...目前农机跨区紧急作业中供需信息不对称,农机部门缺乏科学合理的紧急调配方案,无法在紧急状况下指导农机进行及时有效的调配。针对上述问题,该文研究了农机跨区作业紧急调配模型和算法。首先分析了多机多任务紧急调配过程,建立了以最小化调配成本和损失为目标的紧急调配模型,提出了基于距离最近优先的多机多任务紧急调配算法(shortest-distance first algorithm,SDFA)和基于贡献度最大优先的多机多任务紧急调配算法(max-ability first algorithm,MAFA),前者是搜索当前距离最近的农田和农机,进行优先分配,后者是搜索当前贡献度最大的农田和农机并进行优先分配。采用该文算法对河北省邯郸市2017年的真实数据以及随机生成的农田和农机实例库进行计算与分析可知,当农机数量充足时,算法MAFA的平均调配成本要比SDFA的平均调配成本降低4.34%。当农机不足时,SDFA的平均损失和平均调配成本要比MAFA的平均损失和平均调配成本分别下降了12.79%和4.11%。进一步验证可知,当农田数量为6时,上述2种算法比笔者之前提出的基于非合作博弈紧急调配算法(non-cooperative game algorithm,NCGA)的平均运算性能均提升25%以上,当农田数量为30时,性能均提升41%。该研究可为农机管理部门紧急调配与决策分析提供科学依据。展开更多
文摘Four humic coal samples are extracted to obtain humic substances (HS), and then subdivided(or purified) to obtain sixteen grades of HS, four from each coal. The effectiveness of these sixteen HS samples as additives for producing coal water mixture (CWM) is tested (w (additive) = 1 % and the the coal used is from the Baiyi coal preparation plant). A linear regression analysis of viscosity versus the additive’s components shows: (1)humic acids(HA) and humin (HM) are much better than fulvic acids (HF) with HA being tbe best, and (2) tke effects of grades of HS on coal dispersion as measured by viscosity are quite different. CWM additive effectiveness correlates positively with the increase of E4/E6,ash content, acid groups, and carboxyl groups, and negatively with the increase of molecular weight, HS content and phenolic alcohol content.
文摘目前农机跨区紧急作业中供需信息不对称,农机部门缺乏科学合理的紧急调配方案,无法在紧急状况下指导农机进行及时有效的调配。针对上述问题,该文研究了农机跨区作业紧急调配模型和算法。首先分析了多机多任务紧急调配过程,建立了以最小化调配成本和损失为目标的紧急调配模型,提出了基于距离最近优先的多机多任务紧急调配算法(shortest-distance first algorithm,SDFA)和基于贡献度最大优先的多机多任务紧急调配算法(max-ability first algorithm,MAFA),前者是搜索当前距离最近的农田和农机,进行优先分配,后者是搜索当前贡献度最大的农田和农机并进行优先分配。采用该文算法对河北省邯郸市2017年的真实数据以及随机生成的农田和农机实例库进行计算与分析可知,当农机数量充足时,算法MAFA的平均调配成本要比SDFA的平均调配成本降低4.34%。当农机不足时,SDFA的平均损失和平均调配成本要比MAFA的平均损失和平均调配成本分别下降了12.79%和4.11%。进一步验证可知,当农田数量为6时,上述2种算法比笔者之前提出的基于非合作博弈紧急调配算法(non-cooperative game algorithm,NCGA)的平均运算性能均提升25%以上,当农田数量为30时,性能均提升41%。该研究可为农机管理部门紧急调配与决策分析提供科学依据。
