Study on physical distribution vehicle routing problem with loader scheduling
liu cheng~(1; 2); chen zhi-ya~2(1.school of mathematical science and computing technology; central south university; changsha 410075; china; 2.school of traffic and transportation; central south university; changsha 410075; china)
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Construction techniques of tunnels in soft silt sandy clay
meng xiao-lian~1; chen yong-shu~2; shi zhong-heng~1(1.school of civil engineering and architecture; beijing jiaotong university; beijing 100044; china; 2.the 13th bureau of the china railway; changchun 130031; china)