Purpose-The spatiotemporal compression effect of China-Europe Railway Express(CR-Express)can reduce the filow costs of resources between China's node cities.Additionally,it can break through the limitations of low...Purpose-The spatiotemporal compression effect of China-Europe Railway Express(CR-Express)can reduce the filow costs of resources between China's node cities.Additionally,it can break through the limitations of low-added-value marine products,significantly impacting the logistics industry efficiency.However,there are few literature verifying and analyzing its heterogeneity.This study explores the impact of CR-Express on the efficiency of logistics industry in node cities and analyzes the heterogeneity.Design/methodology/approach-First,this study uses panel data to measure the efficiency of node city logistics industry.Secondiy,this study discusses the impact of the opening of CR-Express on the efficiency of logistics industry in node cities based on the multi-period differential model.Finally,according to the node city difference,the sample city experimental group is grouped for heterogeneity analysis.Findings-The results show that CR-Express can promote the urban logistics industry efficiency,with an average effect of 4.55%.According to the urban characteristics classification,the heterogeneity analysis shows that the efficiency improvement effect of logistics industry in inland cities is more obvious.The improvement effect of node cities and central cities in central and western China is stronger,especially in the sample of megacities and type I big cities.Compared with non-value chain industrial products,the CR-Express has significant promotion effects on the logistics efficiency of the cities where main goods are value chain products.Originality/value-Under the background of double cycle development,this paper can provide a scientific basis for the investment benefit evaluation of CR-Express construction and the follow-up route planning.展开更多
The intermediate link compression characteristics of e-commerce express logistics ne tworks influence the tradition al mode of circulation of goods and economic organization,and alter the city spatial pattern.Based on...The intermediate link compression characteristics of e-commerce express logistics ne tworks influence the tradition al mode of circulation of goods and economic organization,and alter the city spatial pattern.Based on the theory of space of flows,this study adopts China Smart Logistics Network relational data to build China's e-commerce express logistics network and explore its spatial structure characteristics through social network analysis(SNA),the PageRank technique,and geospatial methods.The results are as follows:the network density is 0.9270,which is close to 1;hence,indicating that e-commerce express logistics lines between Chinese cities are nearly complete and they form a typical network structure,thereby eliminating fragmented spaces.Moreover,the average minimum number of edges is 1.1375,which indicates that the network has a small world effect and thus has a high flow efficiency of logistics elements.A significant hierarchical diffusion effect was observed in dominant flows with the highest edge weights.A diamond-structured network was formed with Shanghai,Guangzhou,Chongqing,and Beijing as the four core nodes.Other node cities with a large logistics scale and importance in the network are mainly located in the 19 city agglomerations of China,revealing the fact that the development of city agglomerations is essential for promoting the separation of experience space and changing the urban spatial pattern.This study enriches the theory of urban networks,reveals the flow laws of modern logistics elements,and encourages coordinated development of urban logistics.展开更多
In this paper, we first introduced the concept of cloud logistics, described the current status of the express delivery and analyzed the impacts of introducing cloud logistics on China’s express delivery industry. Th...In this paper, we first introduced the concept of cloud logistics, described the current status of the express delivery and analyzed the impacts of introducing cloud logistics on China’s express delivery industry. Then based on the case of Stars Express, how to introduce the cloud logistics model to the express industry was discussed. Finally, a new model of cloud logistics platform was constructed.展开更多
目的分析Elafin表达水平与食管癌切除术患者预后的相关性。方法选取2020年1月至2022年1月就诊于我院外科的食管癌患者200例。监测患者人白细胞弹性蛋白酶特异性抑制剂(Elastase specific inhibitors,Elafin)表达水平,并行食管癌切除术...目的分析Elafin表达水平与食管癌切除术患者预后的相关性。方法选取2020年1月至2022年1月就诊于我院外科的食管癌患者200例。监测患者人白细胞弹性蛋白酶特异性抑制剂(Elastase specific inhibitors,Elafin)表达水平,并行食管癌切除术。随访1年后根据预后情况分为不良预后组和对照组。比较两组患者临床资料、Elafin表达水平等情况。应用多因素Logistic回归分析Elafin表达水平等因素与食管癌切除术患者预后的相关性。应用ROC曲线分析相关因素预测食管癌切除术患者预后的价值。结果纳入研究的200例患者中有12例病例脱落。剩余188例患者中有41例纳入不良预后组,147例纳入对照组,预后不良发生率为21.81%(41/188)。两组患者年龄、葡萄糖等临床资料对比,差异无统计学意义(P>0.05)。但不良预后组临床分期Ⅲ期、低分化和有淋巴结转移所占的比例均大于对照组(P<0.05),不良预后组Elafin水平低于对照组(P<0.05)。多因素Logistic回归分析显示,临床分期(OR=5.898)、分化程度(OR=3.012)和淋巴结转移(OR=4.876)是影响食管癌切除术患者预后的独立危险因素,Elafin水平(OR=0.117)是影响食管癌切除术患者预后的保护性因素。ROC曲线显示,Elafin水平预测食管癌切除术后预后的诊断效能高于临床分期、分化程度和淋巴结转移,其中Elafin水平的最佳截点为0.49 ng/mL,此时敏感性为92.0%,特异性为80.9%。列线图预测食管癌切除术患者预后不良的一致性指数(C-index)为0.927(95%CI:0.873~0.951)。结论临床分期越高、分化程度越低和有淋巴结转移是影响食管癌切除术患者预后的危险因素,而Elafin表达水平则是保护性因素,早期监测有助于调整治疗方案、改善预后。展开更多
基金National Natural Science Foundation of China(No.72071133)Hebei Provincial Department of Education Humanities and Social Science Research Major Projects(No.ZD202309).
文摘Purpose-The spatiotemporal compression effect of China-Europe Railway Express(CR-Express)can reduce the filow costs of resources between China's node cities.Additionally,it can break through the limitations of low-added-value marine products,significantly impacting the logistics industry efficiency.However,there are few literature verifying and analyzing its heterogeneity.This study explores the impact of CR-Express on the efficiency of logistics industry in node cities and analyzes the heterogeneity.Design/methodology/approach-First,this study uses panel data to measure the efficiency of node city logistics industry.Secondiy,this study discusses the impact of the opening of CR-Express on the efficiency of logistics industry in node cities based on the multi-period differential model.Finally,according to the node city difference,the sample city experimental group is grouped for heterogeneity analysis.Findings-The results show that CR-Express can promote the urban logistics industry efficiency,with an average effect of 4.55%.According to the urban characteristics classification,the heterogeneity analysis shows that the efficiency improvement effect of logistics industry in inland cities is more obvious.The improvement effect of node cities and central cities in central and western China is stronger,especially in the sample of megacities and type I big cities.Compared with non-value chain industrial products,the CR-Express has significant promotion effects on the logistics efficiency of the cities where main goods are value chain products.Originality/value-Under the background of double cycle development,this paper can provide a scientific basis for the investment benefit evaluation of CR-Express construction and the follow-up route planning.
基金Under the auspices of National Natural Science Foundation of China(No.42071165,41801144)GDAS’Project of Science and Technology Development(No.2023GDASZH-2023010101,2021GDASYL-20210103004)。
文摘The intermediate link compression characteristics of e-commerce express logistics ne tworks influence the tradition al mode of circulation of goods and economic organization,and alter the city spatial pattern.Based on the theory of space of flows,this study adopts China Smart Logistics Network relational data to build China's e-commerce express logistics network and explore its spatial structure characteristics through social network analysis(SNA),the PageRank technique,and geospatial methods.The results are as follows:the network density is 0.9270,which is close to 1;hence,indicating that e-commerce express logistics lines between Chinese cities are nearly complete and they form a typical network structure,thereby eliminating fragmented spaces.Moreover,the average minimum number of edges is 1.1375,which indicates that the network has a small world effect and thus has a high flow efficiency of logistics elements.A significant hierarchical diffusion effect was observed in dominant flows with the highest edge weights.A diamond-structured network was formed with Shanghai,Guangzhou,Chongqing,and Beijing as the four core nodes.Other node cities with a large logistics scale and importance in the network are mainly located in the 19 city agglomerations of China,revealing the fact that the development of city agglomerations is essential for promoting the separation of experience space and changing the urban spatial pattern.This study enriches the theory of urban networks,reveals the flow laws of modern logistics elements,and encourages coordinated development of urban logistics.
文摘In this paper, we first introduced the concept of cloud logistics, described the current status of the express delivery and analyzed the impacts of introducing cloud logistics on China’s express delivery industry. Then based on the case of Stars Express, how to introduce the cloud logistics model to the express industry was discussed. Finally, a new model of cloud logistics platform was constructed.
文摘目的分析Elafin表达水平与食管癌切除术患者预后的相关性。方法选取2020年1月至2022年1月就诊于我院外科的食管癌患者200例。监测患者人白细胞弹性蛋白酶特异性抑制剂(Elastase specific inhibitors,Elafin)表达水平,并行食管癌切除术。随访1年后根据预后情况分为不良预后组和对照组。比较两组患者临床资料、Elafin表达水平等情况。应用多因素Logistic回归分析Elafin表达水平等因素与食管癌切除术患者预后的相关性。应用ROC曲线分析相关因素预测食管癌切除术患者预后的价值。结果纳入研究的200例患者中有12例病例脱落。剩余188例患者中有41例纳入不良预后组,147例纳入对照组,预后不良发生率为21.81%(41/188)。两组患者年龄、葡萄糖等临床资料对比,差异无统计学意义(P>0.05)。但不良预后组临床分期Ⅲ期、低分化和有淋巴结转移所占的比例均大于对照组(P<0.05),不良预后组Elafin水平低于对照组(P<0.05)。多因素Logistic回归分析显示,临床分期(OR=5.898)、分化程度(OR=3.012)和淋巴结转移(OR=4.876)是影响食管癌切除术患者预后的独立危险因素,Elafin水平(OR=0.117)是影响食管癌切除术患者预后的保护性因素。ROC曲线显示,Elafin水平预测食管癌切除术后预后的诊断效能高于临床分期、分化程度和淋巴结转移,其中Elafin水平的最佳截点为0.49 ng/mL,此时敏感性为92.0%,特异性为80.9%。列线图预测食管癌切除术患者预后不良的一致性指数(C-index)为0.927(95%CI:0.873~0.951)。结论临床分期越高、分化程度越低和有淋巴结转移是影响食管癌切除术患者预后的危险因素,而Elafin表达水平则是保护性因素,早期监测有助于调整治疗方案、改善预后。
