Molecular dynamics simulation is carried out to study the nanometric machining of single crystal Nickel(Ni). Through an investigation of atomic displacement and the variation of cutting force, it is found that the lat...Molecular dynamics simulation is carried out to study the nanometric machining of single crystal Nickel(Ni). Through an investigation of atomic displacement and the variation of cutting force, it is found that the latter is in accordance with the number variation of elastic displaced atoms in the workpiece. It is further found that the generation of complex stacking faults is the predominant cause of cutting force fluctuation, and the stacking faults with complex structures lead to work-hardening. The temperature of the cutting tool and workpiece is studied during the machining process. It is concluded that the selection of averaging steps has a significant influence on the system temperature distribution. Thus, the time-spatial averaging method, which has a high accuracy and consistency in temperature distribution, is proposed.展开更多
提出了一种考虑集装箱停留时间的堆垛决策支持系统(decision support system considering dwell time,DSS-DT),利用集装箱停留时间的历史数据信息预测拟出场集装箱的停留时间。基于此,针对水平堆垛制定了区域内集装箱堆垛策略,利用数学...提出了一种考虑集装箱停留时间的堆垛决策支持系统(decision support system considering dwell time,DSS-DT),利用集装箱停留时间的历史数据信息预测拟出场集装箱的停留时间。基于此,针对水平堆垛制定了区域内集装箱堆垛策略,利用数学模型和启发式算法选择集装箱场箱位,并通过仿真模拟验证了系统的有效性。结果表明:DSS-DT可明显减少再搬运次数,降低运营成本,提升港口服务水平。展开更多
Based on a synthetic geological study of drilling, well logging and core observations, two main genetic types of Chang 9sand body in Odors Basin were recognized, which included two effects, that is, delta environment ...Based on a synthetic geological study of drilling, well logging and core observations, two main genetic types of Chang 9sand body in Odors Basin were recognized, which included two effects, that is, delta environment and tractive current effects that lead to the development of mouth bar, distal bar, sheet sand and other sand bodies of subaerial and subaqueous distributary channel,natural levee, flood fan and delta front, and shore-shallow lake environment and lake flow transformation effects that result in the development of sandy beach bar, sheet sand and other sand bodies. Chang 9 sand body mainly developed five basic vertical structures, namely box shape, campaniform, infundibuliform, finger and dentoid. The vertical stacking patterns of multilayer sand body was complex, and the common shapes included box shape + box shape, campaniform + campaniform, campaniform + box shape, infundibuliform + infundibuliform, campaniform + infundibuliform, box shape + campaniform, box shape + infundibuliform,and finger + finger. Based on the analysis on major dominating factors of vertical structure of sand body, sedimentary environment,sedimentary facies and rise, fall and cycle of base level are identified as the major geological factors that control the vertical structure of single sand body as well as vertical stacking patterns and distribution of multistory sand bodies.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.51375082)
文摘Molecular dynamics simulation is carried out to study the nanometric machining of single crystal Nickel(Ni). Through an investigation of atomic displacement and the variation of cutting force, it is found that the latter is in accordance with the number variation of elastic displaced atoms in the workpiece. It is further found that the generation of complex stacking faults is the predominant cause of cutting force fluctuation, and the stacking faults with complex structures lead to work-hardening. The temperature of the cutting tool and workpiece is studied during the machining process. It is concluded that the selection of averaging steps has a significant influence on the system temperature distribution. Thus, the time-spatial averaging method, which has a high accuracy and consistency in temperature distribution, is proposed.
文摘提出了一种考虑集装箱停留时间的堆垛决策支持系统(decision support system considering dwell time,DSS-DT),利用集装箱停留时间的历史数据信息预测拟出场集装箱的停留时间。基于此,针对水平堆垛制定了区域内集装箱堆垛策略,利用数学模型和启发式算法选择集装箱场箱位,并通过仿真模拟验证了系统的有效性。结果表明:DSS-DT可明显减少再搬运次数,降低运营成本,提升港口服务水平。
基金Project(2011D-5006-0105)supported by the Technology Innovation Foundation of CNPC,ChinaProject(SZD0414)supported by the Key Discipline of Mineral Prospecting and Exploration of Sichuan Province,China
文摘Based on a synthetic geological study of drilling, well logging and core observations, two main genetic types of Chang 9sand body in Odors Basin were recognized, which included two effects, that is, delta environment and tractive current effects that lead to the development of mouth bar, distal bar, sheet sand and other sand bodies of subaerial and subaqueous distributary channel,natural levee, flood fan and delta front, and shore-shallow lake environment and lake flow transformation effects that result in the development of sandy beach bar, sheet sand and other sand bodies. Chang 9 sand body mainly developed five basic vertical structures, namely box shape, campaniform, infundibuliform, finger and dentoid. The vertical stacking patterns of multilayer sand body was complex, and the common shapes included box shape + box shape, campaniform + campaniform, campaniform + box shape, infundibuliform + infundibuliform, campaniform + infundibuliform, box shape + campaniform, box shape + infundibuliform,and finger + finger. Based on the analysis on major dominating factors of vertical structure of sand body, sedimentary environment,sedimentary facies and rise, fall and cycle of base level are identified as the major geological factors that control the vertical structure of single sand body as well as vertical stacking patterns and distribution of multistory sand bodies.
