物流配送是物流业及物流系统的关键部分,高效、高质量地发展物流配送既是国家政策的要求,又是服务新零售、新制造等业态的必然要求。在此背景下,通过Cite Space V软件对2013-2019年中国知网CNKI关于“物流配送”共计1706篇文献进行可视...物流配送是物流业及物流系统的关键部分,高效、高质量地发展物流配送既是国家政策的要求,又是服务新零售、新制造等业态的必然要求。在此背景下,通过Cite Space V软件对2013-2019年中国知网CNKI关于“物流配送”共计1706篇文献进行可视化分析,发现近几年物流配送研究出现较为明显的变化:一些传统研究热点如配送路径规划、第三方物流等在2018年研究热度纷纷减退,而跨境物流、电子商务等占据研究主流,研究涉及众包物流、智慧物流、干扰管理等新热点,整体物流配送研究开始向高质量、高效率方向迈进。展开更多
We observed an exchange bias effect in La0.5Ca0.5FeO3 perovskite compound.The exchange bias is associated with the charge disproportionation transition from Fe4+ions to Fe3+and Fe5+ions below 175 K.The competition bet...We observed an exchange bias effect in La0.5Ca0.5FeO3 perovskite compound.The exchange bias is associated with the charge disproportionation transition from Fe4+ions to Fe3+and Fe5+ions below 175 K.The competition between the ferromagnetic interaction of Fe3+and Fe5+ions and the antiferromagnetic one of Fe3+and Fe3+ions results in a unidirectional anisotropy in the cluster-glass system.An antiferromagnetically interfacial exchange coupling constant Ji1.95 meV at the cluster-glass region was yielded by fitting the cooling field-dependence of the exchange bias field.展开更多
文摘物流配送是物流业及物流系统的关键部分,高效、高质量地发展物流配送既是国家政策的要求,又是服务新零售、新制造等业态的必然要求。在此背景下,通过Cite Space V软件对2013-2019年中国知网CNKI关于“物流配送”共计1706篇文献进行可视化分析,发现近几年物流配送研究出现较为明显的变化:一些传统研究热点如配送路径规划、第三方物流等在2018年研究热度纷纷减退,而跨境物流、电子商务等占据研究主流,研究涉及众包物流、智慧物流、干扰管理等新热点,整体物流配送研究开始向高质量、高效率方向迈进。
基金supported by the National Basic Research Program of Chinathe National Natural Sciences Foundation of China(Grant No.11205015)+1 种基金the Natural Sciences Foundation of Beijing(Grant No.1113017)Beijing Area Logistics System&Technology Major Laboratory and the Logistics Management and Engineering Innovation Platform of Beijing Wuzi University
文摘We observed an exchange bias effect in La0.5Ca0.5FeO3 perovskite compound.The exchange bias is associated with the charge disproportionation transition from Fe4+ions to Fe3+and Fe5+ions below 175 K.The competition between the ferromagnetic interaction of Fe3+and Fe5+ions and the antiferromagnetic one of Fe3+and Fe3+ions results in a unidirectional anisotropy in the cluster-glass system.An antiferromagnetically interfacial exchange coupling constant Ji1.95 meV at the cluster-glass region was yielded by fitting the cooling field-dependence of the exchange bias field.