Optimization of Empty Pallets Dispatching Based on Different Transportation Modes

In the pallet pool system, the differentiation of palletized freight volumes in different regions and seasonal transport of certain goods lead to the imbalance of pallets distribution among regions. It is necessary to improve the utilization of pallets through dispatching. The paper analyzes the factors which affect empty pallets dispatching, it includes carbon emission, transportation time and pallet type based on the pallet pool mode of enterprise alliance. On this basis, the optimization model is established with the goal of minimum total dispatching cost. Then, according to the different influences of railway and highway in transportation cost, the dispatching scheme is analyzed and the transportation mode of empty pallets dispatching is determined. Considering the characteristics of model, Cplex is used to solve it. Finally, a case is used to verify the feasibility and superiority of reasonable empty pallets dispatching in different transportation modes, and the transport characteristics of two transportation modes are analyzed. Moreover, the costs of pallets leasing and dispatching are compared.

VEGFA rs3025039 and biliary atresia susceptibility in Chinese population:a systematic review and meta-analysis

Background Previous studies have suggested an association between vascular endothelial growth factor A(VEGFA)rs3025039 polymorphism and biliary atresia(BA).However,this conclusion is controversial and there is no published pooled evidence of this association.Methods This study was conducted and reported according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses.The protocol was registered with PROSPERO(International Prospective Register of Systematic Reviews).A thorough search was performed on databases including PubMed,Embase,and Chinese Biomedical Database up to August 2020.This study included 846 cases of BA and 2821 controls concerning VEGFA rs3025039 polymorphism.We selected relevant studies based on the following inclusion criteria:(1)the study design was case-control and cohort and(2)the patients carried standard clinical diagnoses of BA,etc.The exclusion criteria were as follows:(1)patients with other related diseases,(2)lack of requisite information and(3)duplicate data.The OR(odd ratio)and the corresponding 95%CI(confidence interval)were calculated to estimate the association.Results This study on VEGFA rs3025039 polymorphism in the Chinese population included 846 cases and 2821 controls.The results showed that there was no significant association between rs3025039 and susceptibility to BA under four genetic models.The results of the subgroup analysis were similar to the overall results.Conclusions This meta-analysis shows that rs3025039 was not associated with susceptibility to BA in the Chinese population.Further validation may entail additional research.PROSPERO registration number CRD42020203812.