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Optimal Decisions and Coordination Mechanisms for a Fresh Agricultural Product Supply Chain System
Lei Yang,Kebing Chen,Guimei Ma 보안공학연구지원센터 2014 International Journal of u- and e- Service, Scienc Vol.7 No.5
For a one-supplier-one-retailer agricultural product supply chain, quantity and quality of the agricultural products often reduce because their own perishable and anthropogenic factors in the process from the supplier via the retailer to final consumers. This paper takes shortage and deterioration factors into account, establishes related profit functions of the supplier and the retailer, obtains the optimal ordering cycle and quantity decisions, and analyzes the impact of deterioration on decision makers under the decentralized system. To maximize the total profit of supply chain, we explore coordination mechanisms for the supply chain when considering shortage and deterioration factors, such as revenue sharing contract, quantity discount contract and buy-back contract. By comparing these different contracts, the coordination effect is analyzed in details. Finally, through series of numerical analysis, some managerial insights are provided.
Nonlinear aerostatic stability analysis of Hutong cable-stayed rail-cum-road bridge
Man Xu,Weiwei Guo,He Xia,Kebing Li 한국풍공학회 2016 Wind and Structures, An International Journal (WAS Vol.23 No.6
To investigate the nonlinear aerostatic stability of the Hutong cable-stayed rail-cum-road bridge with ultra-kilometer main span, a FEM bridge model is established. The tri-component wind loads and geometric nonlinearity are taken into consideration and discussed for the influence of nonlinear parameters and factors on bridge resistant capacity of aerostatic instability. The results show that the effect of initial wind attack-angle is significant for the aerostatic stability analysis of the bridge. The geometric nonlinearities of the bridge are of considerable importance in the analysis, especially the effect of cable sag. The instable mechanism of the Hutong Bridge with a steel truss girder is the spatial combination of vertical bending and torsion with large lateral bending displacement. The design wind velocity is much lower than the static instability wind velocity, and the structural aerostatic resistance capacity can meet the requirement.
Mesoscale modeling of the temperature-dependent viscoelastic behavior of a Bitumen-Bound Gravels
Sow, Libasse,Bernard, Fabrice,Kamali-Bernard, Siham,Kebe, Cheikh Mouhamed Fadel Techno-Press 2018 Coupled systems mechanics Vol.7 No.5
A hierarchical multi-scale modeling strategy devoted to the study of a Bitumen-Bound Gravel (BBG) is presented in this paper. More precisely, the paper investigates the temperature-dependent linear viscoelastic of the material when submitted to low deformations levels and moderate number of cycles. In such a hierarchical approach, 3D digital Representative Elementary Volumes are built and the outcomes at a scale (here, the sub-mesoscale) are used as input data at the next higher scale (here, the mesoscale). The viscoelastic behavior of the bituminous phases at each scale is taken into account by means of a generalized Maxwell model: the bulk part of the behavior is separated from the deviatoric one and bulk and shear moduli are expanded into Prony series. Furthermore, the viscoelastic phases are considered to be thermorheologically simple: time and temperature are not independent. This behavior is reproduced by the Williams-Landel-Ferry law. By means of the FE simulations of stress relaxation tests, the parameters of the various features of this temperature-dependent viscoelastic behavior are identified.
Nonlinear aerostatic stability analysis of Hutong cable-stayed rail-cum-road bridge
Xu, Man,Guo, Weiwei,Xia, He,Li, Kebing Techno-Press 2016 Wind and Structures, An International Journal (WAS Vol.23 No.6
To investigate the nonlinear aerostatic stability of the Hutong cable-stayed rail-cum-road bridge with ultra-kilometer main span, a FEM bridge model is established. The tri-component wind loads and geometric nonlinearity are taken into consideration and discussed for the influence of nonlinear parameters and factors on bridge resistant capacity of aerostatic instability. The results show that the effect of initial wind attack-angle is significant for the aerostatic stability analysis of the bridge. The geometric nonlinearities of the bridge are of considerable importance in the analysis, especially the effect of cable sag. The instable mechanism of the Hutong Bridge with a steel truss girder is the spatial combination of vertical bending and torsion with large lateral bending displacement. The design wind velocity is much lower than the static instability wind velocity, and the structural aerostatic resistance capacity can meet the requirement.