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区域视角下跨境电商产业集聚效率研究——基于超效率SBM-Malmquist模型分析

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江苏商论 2025年第1期 43-47,52页

作者：曾雯汪明艳上海工程技术大学管理学院上海201620

跨境电商在国际贸易转型发展中起着至关重要的作用,而长三角、京津冀、珠三角区域作为中国跨境电商头部经济区在外贸中表现十分活跃。因此为进一步了解跨境电商产业集聚状况,本文选取2016—2021年长三角、京津冀、珠三角三大经济区面板... 详细信息

跨境电商在国际贸易转型发展中起着至关重要的作用,而长三角、京津冀、珠三角区域作为中国跨境电商头部经济区在外贸中表现十分活跃。因此为进一步了解跨境电商产业集聚状况,本文选取2016—2021年长三角、京津冀、珠三角三大经济区面板数据,运用超效率SBM-Malmquist模型从静态和动态两个维度对三大经济区跨境电商集聚效率进行评价。结果显示,跨境电商集聚效率整体表现为珠三角>长三角>京津冀,而纯技术效率和规模效率是拉开差异的主要原因。应该着力推动跨境电商集群均衡发展,加强三大经济区内特色品牌和优势资源互通、技术扩散和知识溢出,强化区域间协同合作。

关键词：跨境电商产业集聚三大经济区超效率SBM-Malmquist模型

Numerical simulation of 3D-microstructures in solidification processes based on the CAFE method

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International Journal of Minerals,Metallurgy and Materials 2009年第6期16卷 640-645页

作者： Jin-long wang Fu-ming wang yan-yu Zhao Jiong-ming Zhang Wei Ren School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

It was analyzed that the finite element-cellular automaton （CAFE） method was used to simulate 3D-microstructures in solidification processes. Based on this method, the 3D-microstructure of 9SMn28 free-cutting steel was simulated in solidification processes and the simulation results are consistent with the experimental ones. In addition, the effects of Gaussian distribution parameters were also studied. The simulation results show that the higher the mean undercooling, the larger the columnar dendrite zones, and the larger the maximum nucleation density, the smaller the size of grains. The larger the standard deviation, the less the number of minimum grains is. However, the uniformity degree decreases first, and then increases gradually.

关键词： finite element-cellular automaton model numerical simulation solidification 3D-microstructure Gaussian distribution parameters

Capillary electrophoresis with direct chemiluminescence detection for the analysis of catecholamines in human urine

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Chinese Chemical Letters 2007年第4期18卷 452-454页

作者： Cheng Quan wang Hui wang yan ming Liu College of Chemistry and Chemical Engineering Xinyang Normal University Xinyang 464000 China

A rapid and sensitive method for the analysis of three catecholamines by capillary electrophoresis （CE） with direct chemiluminescence （CL） detection is described. The detection limits （S/N= 3） were 1.3 × 10^-8 g/mL for isoprenaline, 1.0 × 10^-8g/mL for epinephrine and 2.8 × 10^-8 g/mL for dopamine. The proposed method was successfully applied to the analysis of catecholamines in urine samples of cigarette smokers and nonsmokers. The results showed that there is a close relation between the release of dopamine in human body fluids and cigarette smoking/nonsmoking.

关键词： Capillary electrophoresis Catecholamines Chemiluminescence detection Urine

Radiofrequency ablation vs hepatic resection for solitary colorectal liver metastasis:A meta-analysis

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World Journal of Gastroenterology 2011年第36期17卷 4143-4148页

作者： Yun-Zi Wu Bin Li Tao wang Shuang-Jia wang yan-ming Zhou Department of Hepato-Biliary-Pancreato-Vascular Surgery the First Affiliated Hospital of Xiamen UniversityXiamen 361003Fujian ProvinceChina

AIM:To evaluate the comparative therapeutic efficacy of radiofrequency ablation (RFA) and hepatic resection (HR) for solitary colorectal liver metastases (CLM).METHODS:A literature search was performed to identify comparative studies reporting outcomes for both RFA and HR for solitary *** odds ratios (OR) with 95% confidence intervals (95% CI) were calculated using either the fixed effects model or random effects ***:Seven nonrandomized controlled trials studies were included in this *** studies included a total of 847 patients:273 treated with RFA and 574 treated with *** 5 years overall survival rates in the HR group were significantly better than those in the RFA group (OR:0.41,95% CI:0.22-0.90,P=0.008).RFA had a higher rate of local intrahe-patic recurrence compared to HR (OR:4.89,95% CI:1.73-13.87,P=0.003).No differences were found between the two groups with respect to postoperative morbidity and ***:HR was superior to RFA in the treatment of patients with solitary ***,the findings have to be carefully interpreted due to the lower level of evidence.

关键词： Hepatic resection Colorectal liver metastases Radiofrequency ablation Efficacy Meta-analysis

5-Hydroxymethylfurfural protects against ER stress-induced apoptosis in GalN/TNF-α-injured L02 hepatocytes through regulating the PERK-eIF2α signaling pathway

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Chinese Journal of Natural Medicines 2015年第12期13卷 896-905页

作者： JIANG Ze-Qun MA yan-Xia LI Mu-Han ZHAN Xiu-Qin ZHANG Xu wang ming-yan Nanjing University of Chinese Medicine Jiangsu Collaborative Innovation Center of Traditional Chinese Medicine(TCM) Prevention and Treatment of Tumor

5-Hydroxymethylfurfural （5-HMF）, a water-soluble compound extracted from wine-processed Fructus corni, is a novel hepatic protectant for treating acute liver injury. The present study was designed to investigate the protective effect of 5-HMF in human L02 hepatocytes injured by D-galactosamine （GAIN） and tumor necrosis factor-α （TNF-α） in vitro and to explore the underlying mechanisms of action. Our results showed that 5-HMF caused significant increase in the viability of L02 cells injured by GalN/TNF-α, in accordance with a dose-dependent decrease in apoptotic cell death confirmed by morphological and flow cytometric analyses. Based on immunofluorescence and Western blot assays, we found that GalN/TNF-α induced ER stress in the cells, as indicated by the disturbance of intracellular Ca^2＋ concentration, the activation of protein kinase RNA （PKR）-like ER kinase （PERK）, phosphorylation of eukaryotic initiation factor 2 alpha （eIF2α）, and expression of ATF4 and CHOP proteins, which was reversed by 5-HMF pre-treatment in a dose-dependent manner. The anti-apoptotic effect of 5-HMF was further evidenced by balancing the expression of Bcl-2 family members. In addition, the knockdown of PERK suppressed the expression of phospho-PERK, phospho-eIF2α, ATF4, and CHOP, resulting in a significant decrease in cell apoptosis after the treatment with GalN/TNF-α. 5-HMF could enhance the effects of PERK knockdown, protecting the cells against the GalN/TNF-α insult. In conclusion, these findings demonstrate that 5-HMF can effectively protect GalN/TNF-α-injured L02 hepatocytes against ER stress-induced apoptosis through the regulation of the PERK- eIF2α signaling pathway, suggesting that it is a possible candidate for liver disease therapy.

关键词： 5-Hydroxymethylfurfural GalN/TNF-α L02 hepatocytes Apoptosis PERK-eIF2α

A Theory and Method for Modeling of Structures with Stochastic Parameters

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上海交通大学学报 2004年第Z2期38卷 194-198页

作者： ZHANG Bei YIN Xue-gang wang Fu-ming ZHONG yan-hui CAI Ying-chun Chonging University Chongqing400044 P. R. China Zhengzhou University Zhengzhou450002 P. R. China Chonging University Chongqing400044 P. R. China Zhengzhou University Zhengzhou450002 P. R. China Zhengzhou University Zhengzhou450002 P. R. China Dalian University of Technology Dalian116024 P. R. China Zhengzhou University Zhengzhou450002 P. R. China Dalian University of Technology Dalian116024 P. R. China

In order to reflect the stochastic characteristics of structures more comprehensively and accurately, a theory and method for modeling of structures with stochastic parameters is presented by using probability finite element method and stochastic experiment data of structures based on the modeling of structures with deterministic parameters. Double-decker space frame is taken as an example to validate this theory and method, good results are gained.

关键词： probability finite element method stochastic parameter structure modeling

A General Description for Chinese Medicine in Treating Premature Ovarian Failure

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Chinese Journal of Integrative Medicine 2017年第2期23卷 91-97页

作者： LIN Jing LI Xue-lian SONG Hui LI Qian wang ming-yan QIU Xue-min LI Da-jin wang Ling Laboratory for Reproductive Immunology Hospital and Institute of Obstetrics and GynecologyInstitutes of Biomedical SciencesIBSFudan University Shanghai MedicaJ CollegeShanghai200032China Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases Shanghai200011China The Academy of Integrative Medicine of Fudan University Shanghai200032China

Premature ovarian failure（POF） is a kind of gynecological disease that causes amenorrhea, infertility, menopause and urogenital symptoms. Currently hormone replacement therapy（HRT） is the most popular choice for women with POF to get rid of menopausal syndrome. However, as the popularization of Chinese herbs made Chinese medicine（CM） shine new lights, physicians are able to treat POF with both meno-herbs and integrated therapy. HRT has its own indications and contraindications. For example, unexplained vaginal bleeding, acute liver damage, liver dysfunction, vascular embolization, and breast cancer are all contraindications of HRT, and CM is taken by more physicians as an adjuvant therapy. This review, including a range of common Chinese herbs and formulations according to the existing literature, provides a general description of CM treating POF from the aspects of mechanisms and clinical application. It also highlights acupuncture as a unique physiotherapy for POF. Although the validity of CM has been supported by the evidence of many preclinical trials, clinical trials and meta-analysis, the adverse events with CM therapy still exist and no guarantee has been made for its safety. This review concludes the updated information for CM treating POF contributing to further studies.e

关键词： Chinese medicine Chinese herbal medicine premature ovarian failure infertility acupuncture

SEEPAGE ANALYSIS OF LANDFILL FOUNDATIONS IN SHANGHAI LAOGANG LANDFILL PHASE IV

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Journal of Hydrodynamics 2006年第5期18卷 613-619页

作者： ZHANG Qian-fei wang yan-ming XU Yong-fu School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University Shanghai 200030 China Shanghai Municipal Engineering Design Institute Shanghai 200092 China

A complex seepage flow field with unknown free surface was formed in the Shanghai Laogang Municipal Solid Waste （MSW） Landfill by the perimeter cut-off wall around the landfill site and the Prefabricated Vertical Drains （PVD） in the foundation of landfill. First, the equivalent vertical permeability was presented based on the drainage mechanism of PVD and the related calculation method was studied to macroscopically reflect the impact of PVD on the seepage flow status of the landfill foundation. With the influence of the cut-off wall and the PVD on the infiltration of groundwater, the total inflow was classified into two parts： the lateral inflow through the cut-off wall outside the landfill, and the upward infiltration through the PVD from the foundation of the landfill. Seepage analysis was conducted using the finite element method according to the actual scenario of Laogang Landfill, and the lateral infiltration and the upward infiltration were calculated, respectively. The results show that the total inflow into the landfill area was mostly supplied by the upward infiltration through the PVD and the perimeter cut-off wall was significantly effective to depressurize the seepage pressure and to reduce the flow rate.

关键词： Municipal Solid Waste (MSW) landfill foundations of landfill cut-off wall Prefabricated Vertical Drain (PVD) lateral infiltration upward infiltration finite element analysis

Drying Shrinkage of Cement-Based Materials Under Conditions of Constant Temperature and Varying Humidity

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Journal of China University of Mining and Technology 2007年第3期17卷 428-431页

作者： MA Bao-guo WEN Xiao-dong wang ming-yuan yan Jia-jia Gao Xiao-jian Key Laboratory for Silicate Materials Science and Engineering of Ministry of Education Wuhan University of Technology Wuhan Hubei 430070 China

Currently,deformations along the central axis of specimens were usually measured under fixed environmental conditions. Seldom were the effects of environmental factors on the drying-shrinkage deformation of cement-based ma-terial considered. For this paper,the drying-shrinkage deformation at different w/b ratios and different additions to mor-tars was investigated under different environments at a temperature of 20 ℃ and humidity ranging from 100% to 50%. The specimens were cured in water for 28 days before measurement. The results illustrate that mortar shows much less shrinkage under various drying conditions when a lower w/b ratio is adopted. With a decrease in relative humidity the speed of drying-shrinkage becomes gradually lower. The addition of silica fume reduces the drying-shrinkage of mortar under higher relative humidity,because the pore structure of mortar with silica fume becomes more refined. The addi-tion of fly ash increases the total porosity and the volume of coarse pores in the mortar. The drying-shrinkage of mortar under different conditions increases with the addition of more of fly ash.

关键词： humidity variation volume deformation pore structure